#include "timelinewidget.h"

#include "panels/panels.h"
#include "io/config.h"
#include "project/sequence.h"
#include "project/clip.h"
#include "panels/project.h"
#include "panels/timeline.h"
#include "io/media.h"
#include "ui/sourcetable.h"
#include "panels/effectcontrols.h"
#include "project/undo.h"

#include "effects/effects.h"
#include "effects/transition.h"

#include <QPainter>
#include <QColor>
#include <QDebug>
#include <QMouseEvent>
#include <QObject>
#include <QVariant>
#include <QPoint>
#include <QMenu>
#include <QMessageBox>
#include <QtMath>

#define MAX_TEXT_WIDTH 20

TimelineWidget::TimelineWidget(QWidget *parent) : QWidget(parent) {
	bottom_align = false;
    track_resizing = false;
    setMouseTracking(true);

    setAcceptDrops(true);

    setContextMenuPolicy(Qt::CustomContextMenu);
    connect(this, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(show_context_menu(const QPoint&)));
}

void TimelineWidget::show_context_menu(const QPoint& pos) {
    QMenu menu(this);
    menu.addAction("Context menu coming soon...");
    menu.exec(mapToGlobal(pos));
}

bool same_sign(int a, int b) {
	return (a < 0) == (b < 0);
}

void TimelineWidget::resizeEvent(QResizeEvent*) {
    if (sequence != NULL) redraw_clips();
}

void TimelineWidget::dragEnterEvent(QDragEnterEvent *event) {
    if (event->source() == panel_project->source_table) {
        event->accept();

        QPoint pos = event->pos();
        QList<QTreeWidgetItem*> items = panel_project->source_table->selectedItems();
        long entry_point;
        if (sequence == NULL) {
            // if no sequence, we're going to create a new one using the clips as a reference
            entry_point = 0;

            // shitty hardcoded default values
            predicted_video_width = 1920;
            predicted_video_height = 1080;
            predicted_new_frame_rate = 29.97;
            predicted_audio_freq = 48000;
            predicted_audio_layout = 3;

            bool got_video_values = false;
            bool got_audio_values = false;
            for (int i=0;i<items.size();i++) {
                QTreeWidgetItem* item = items.at(i);
                if (get_type_from_tree(item) == MEDIA_TYPE_FOOTAGE) {
                    Media* m = get_media_from_tree(item);
                    if (m->ready) {
                        if (!got_video_values) {
                            for (int j=0;j<m->video_tracks.size();j++) {
                                MediaStream* ms = m->video_tracks.at(j);
                                predicted_video_width = ms->video_width;
                                predicted_video_height = ms->video_height;
                                if (ms->video_frame_rate != 0) {
                                    predicted_new_frame_rate = ms->video_frame_rate;

                                    // only break with a decent frame rate, otherwise there may be a better candidate
                                    got_video_values = true;
                                    break;
                                }
                            }
                        }
                        if (!got_audio_values) {
                            for (int j=0;j<m->audio_tracks.size();j++) {
                                MediaStream* ms = m->audio_tracks.at(j);
                                predicted_audio_freq = ms->audio_frequency;
                                got_audio_values = true;
                                break;
                            }
                        }
                        if (got_video_values && got_audio_values) break;
                    }
                }
            }
        } else {
            entry_point = panel_timeline->getFrameFromScreenPoint(pos.x());
            panel_timeline->drag_frame_start = entry_point + panel_timeline->getFrameFromScreenPoint(50);
            panel_timeline->drag_track_start = (bottom_align) ? -1 : 0;
            predicted_new_frame_rate = sequence->frame_rate;
        }
        for (int i=0;i<items.size();i++) {
            QTreeWidgetItem* item = items.at(i);
            if (get_type_from_tree(item) == MEDIA_TYPE_FOOTAGE) {
                Media* m = get_media_from_tree(item);
                if (m->ready) {
                    Ghost g;
                    g.clip = -1;
                    g.media = m;
                    g.old_clip_in = g.clip_in = 0;
                    g.in = entry_point;
                    if (m->video_tracks.size() > 0 && m->video_tracks[0]->infinite_length && m->audio_tracks.size() == 0) {
                        g.out = g.in + 100;
                    } else {
                        g.out = entry_point + m->get_length_in_frames(predicted_new_frame_rate);
                    }
                    entry_point = g.out;
                    g.trimming = false;
                    for (int j=0;j<m->audio_tracks.size();j++) {
                        g.track = j;
                        g.media_stream = m->audio_tracks.at(j)->file_index;
                        panel_timeline->ghosts.append(g);
                    }
                    for (int j=0;j<m->video_tracks.size();j++) {
                        g.track = -1-j;
                        g.media_stream = m->video_tracks.at(j)->file_index;
                        panel_timeline->ghosts.append(g);
                    }
                }
            }
        }
        for (int i=0;i<panel_timeline->ghosts.size();i++) {
            Ghost& g = panel_timeline->ghosts[i];
            g.old_in = g.in;
            g.old_out = g.out;
            g.old_track = g.track;
        }
        panel_timeline->importing = true;
	}
}

void TimelineWidget::dragMoveEvent(QDragMoveEvent *event) {
    if (sequence != NULL && panel_timeline->importing) {
		QPoint pos = event->pos();
        update_ghosts(pos);
		panel_timeline->repaint_timeline();
	}
}

void TimelineWidget::dragLeaveEvent(QDragLeaveEvent*) {
    if (sequence != NULL && panel_timeline->importing) {
		panel_timeline->ghosts.clear();
		panel_timeline->importing = false;
		panel_timeline->repaint_timeline();
	}
}

void TimelineWidget::dropEvent(QDropEvent* event) {
    if (panel_timeline->importing && panel_timeline->ghosts.size() > 0) {
        event->accept();

        TimelineAction* ta = new TimelineAction();

        QVector<Clip*> added_clips;

        Sequence* s = sequence;
        if (s == NULL) {
            s = new Sequence();

            // dumb hardcoded default values, should be settable somewhere
            s->name = panel_project->get_next_sequence_name();
            s->width = predicted_video_width;
            s->height = predicted_video_height;
            s->frame_rate = predicted_new_frame_rate;
            s->audio_frequency = predicted_audio_freq;
            s->audio_layout = predicted_audio_layout;

            panel_project->new_sequence(ta, s, true, NULL);
        } else {
            // delete areas before adding
            QVector<Selection> delete_areas;
            for (int i=0;i<panel_timeline->ghosts.size();i++) {
                const Ghost& g = panel_timeline->ghosts.at(i);
                Selection sel;
                sel.in = g.in;
                sel.out = g.out;
                sel.track = g.track;
                delete_areas.append(sel);
            }
            panel_timeline->delete_areas_and_relink(ta, delete_areas);
        }

        // add clips
		for (int i=0;i<panel_timeline->ghosts.size();i++) {
            const Ghost& g = panel_timeline->ghosts.at(i);

            Clip* c = new Clip(s);
            c->media = g.media;
            c->media_stream = g.media_stream;
            c->timeline_in = g.in;
            c->timeline_out = g.out;
            c->clip_in = g.clip_in;
            if (c->media->video_tracks.size() == 0) {
                // audio only (greenish)
                c->color_r = 128;
                c->color_g = 192;
                c->color_b = 128;
            } else if (c->media->audio_tracks.size() == 0) {
                // video only (orangeish)
                c->color_r = 192;
                c->color_g = 160;
                c->color_b = 128;
            } else {
                // video and audio (blueish)
                c->color_r = 128;
                c->color_g = 128;
                c->color_b = 192;
            }
            c->track = g.track;
            c->name = c->media->name;

            if (c->track < 0) {
                // add default video effects
                c->effects.append(create_effect(VIDEO_TRANSFORM_EFFECT, c));
			} else {
				// add default audio effects
                c->effects.append(create_effect(AUDIO_VOLUME_EFFECT, c));
                c->effects.append(create_effect(AUDIO_PAN_EFFECT, c));
            }

            added_clips.append(c);
		}

        // link clips from the same media
        for (int i=0;i<added_clips.size();i++) {
            Clip* c = added_clips.at(i);
            for (int j=0;j<added_clips.size();j++) {
                Clip* cc = added_clips.at(j);
                if (c != cc && c->media == cc->media) {
                    c->linked.append(j);
                }
            }
        }

        ta->add_clips(s, added_clips);

		panel_timeline->ghosts.clear();
		panel_timeline->importing = false;
        panel_timeline->snapped = false;

        undo_stack.push(ta);

        setFocus();

        panel_timeline->redraw_all_clips(true);
	}
}

void TimelineWidget::mouseDoubleClickEvent(QMouseEvent *event) {
    if (panel_timeline->tool == TIMELINE_TOOL_EDIT) {
        int clip_index = getClipIndexFromCoords(panel_timeline->cursor_frame, panel_timeline->cursor_track);
        if (clip_index >= 0) {
            Clip* clip = sequence->get_clip(clip_index);
            if (!(event->modifiers() & Qt::ShiftModifier)) panel_timeline->selections.clear();
            Selection s;
            s.in = clip->timeline_in;
            s.out = clip->timeline_out;
            s.track = clip->track;
            panel_timeline->selections.append(s);
            panel_timeline->repaint_timeline();
        }
    }
}

void TimelineWidget::mousePressEvent(QMouseEvent *event) {
    if (sequence != NULL) {
        if (event->button() == Qt::LeftButton) {
            if (panel_timeline->tool == TIMELINE_TOOL_EDIT || panel_timeline->tool == TIMELINE_TOOL_RAZOR) {
                panel_timeline->drag_frame_start = panel_timeline->cursor_frame;
                panel_timeline->drag_track_start = panel_timeline->cursor_track;
            } else {
                QPoint pos = event->pos();
                panel_timeline->drag_frame_start = panel_timeline->getFrameFromScreenPoint(pos.x());
                panel_timeline->drag_track_start = getTrackFromScreenPoint(pos.y());
            }

            int clip_index = panel_timeline->trim_target;
            if (clip_index == -1) clip_index = getClipIndexFromCoords(panel_timeline->drag_frame_start, panel_timeline->drag_track_start);

            bool shift = (event->modifiers() & Qt::ShiftModifier);

            if (shift) {
                panel_timeline->selection_offset = panel_timeline->selections.size();
            } else {
                panel_timeline->selection_offset = 0;
            }

            switch (panel_timeline->tool) {
            case TIMELINE_TOOL_POINTER:
            case TIMELINE_TOOL_RIPPLE:
            case TIMELINE_TOOL_SLIP:
            case TIMELINE_TOOL_ROLLING:
            case TIMELINE_TOOL_SLIDE:
            {
                if (track_resizing) {
                    track_resize_mouse_cache = event->pos().y();
                    panel_timeline->moving_init = true;
                } else {
                    if (clip_index >= 0) {
                        Clip* clip = sequence->get_clip(clip_index);
                        if (clip != NULL) {
                            if (panel_timeline->is_clip_selected(clip, true)) {
                                if (shift) {
                                    // TODO if shift is down, deselect it
                                }
                            } else {
                                // if "shift" is not down
                                if (!shift) {
                                    panel_timeline->selections.clear();
                                }

                                Selection s;

                                s.in = clip->timeline_in;
                                s.out = clip->timeline_out;
                                s.track = clip->track;
                                panel_timeline->selections.append(s);

                                if (config.select_also_seeks) {
                                    panel_timeline->seek(clip->timeline_in);
                                }

                                // if alt is not down, select links
                                if (!(event->modifiers() & Qt::AltModifier)) {
                                    for (int i=0;i<clip->linked.size();i++) {
                                        Clip* link = sequence->get_clip(clip->linked.at(i));
                                        if (!panel_timeline->is_clip_selected(link, true)) {
                                            Selection ss;
                                            ss.in = link->timeline_in;
                                            ss.out = link->timeline_out;
                                            ss.track = link->track;
                                            panel_timeline->selections.append(ss);
                                        }
                                    }
                                }
                            }
                        }

                        panel_timeline->moving_init = true;
                    } else {
                        // if "shift" is not down
                        if (!shift) {
                            panel_timeline->selections.clear();
                        }

                        panel_timeline->rect_select_init = true;
                    }
                    panel_timeline->repaint_timeline();
                }
            }
                break;
            case TIMELINE_TOOL_EDIT:
                if (config.edit_tool_also_seeks) panel_timeline->seek(panel_timeline->drag_frame_start);
                panel_timeline->selecting = true;
                break;
            case TIMELINE_TOOL_RAZOR:
            {
                panel_timeline->splitting = true;
                panel_timeline->split_tracks.append(panel_timeline->drag_track_start);
                panel_timeline->repaint_timeline();
            }
                break;
            }
        }
    }
}

void TimelineWidget::mouseReleaseEvent(QMouseEvent *event) {
    if (sequence != NULL) {
        bool alt = (event->modifiers() & Qt::AltModifier);

        if (event->button() == Qt::LeftButton) {
            bool repaint = false;

            if (panel_timeline->moving_proc) {
                TimelineAction* ta = new TimelineAction();

                // if we were RIPPLING, move all the clips
                if (panel_timeline->tool == TIMELINE_TOOL_RIPPLE) {
                    long ripple_length, ripple_point;

                    // ripple_length becomes the length/number of frames we trimmed
                    // ripple point becomes the point to ripple (i.e. the point after or before which we move every clip)
                    const Ghost& first_ghost = panel_timeline->ghosts.at(0);
                    if (panel_timeline->trim_in_point) {
                        ripple_length = first_ghost.old_in - panel_timeline->ghosts.at(0).in;
                        ripple_point = first_ghost.old_in;
                    } else {
                        // if we're trimming an out-point
                        ripple_length = first_ghost.old_out - panel_timeline->ghosts.at(0).out;
                        ripple_point = first_ghost.old_out;
                    }
                    QVector<int> ignore_clips;
                    for (int i=0;i<panel_timeline->ghosts.size();i++) {
                        const Ghost& g = panel_timeline->ghosts.at(i);

                        // push rippled clips forward if necessary
                        if (panel_timeline->trim_in_point) {
                            ignore_clips.append(g.clip);
                            panel_timeline->ghosts[i].in += ripple_length;
                            panel_timeline->ghosts[i].out += ripple_length;
                        }

                        long comp_point = panel_timeline->trim_in_point ? g.old_in : g.old_out;
                        ripple_point = qMin(ripple_point, comp_point);
                    }
                    if (!panel_timeline->trim_in_point) ripple_length = -ripple_length;
                    ta->ripple(sequence, ripple_point, ripple_length, ignore_clips);
                }

                if (panel_timeline->tool == TIMELINE_TOOL_POINTER && (event->modifiers() & Qt::AltModifier)) { // if holding alt, duplicate rather than move
                    // duplicate clips
                    QVector<int> old_clips;
                    QVector<Clip*> new_clips;
                    QVector<Selection> delete_areas;
                    for (int i=0;i<panel_timeline->ghosts.size();i++) {
                        const Ghost& g = panel_timeline->ghosts.at(i);
                        if (g.old_in != g.in || g.old_out != g.out || g.track != g.old_track || g.clip_in != g.old_clip_in) {
                            // create copy of clip
                            Clip* c = sequence->get_clip(g.clip)->copy(sequence);

                            c->timeline_in = g.in;
                            c->timeline_out = g.out;
                            c->track = g.track;

                            Selection s;
                            s.in = g.in;
                            s.out = g.out;
                            s.track = g.track;
                            delete_areas.append(s);

                            old_clips.append(g.clip);
                            new_clips.append(c);
                        }
                    }
                    if (new_clips.size() > 0) {
                        panel_timeline->delete_areas_and_relink(ta, delete_areas);

                        // relink duplicated clips
                        panel_timeline->relink_clips_using_ids(old_clips, new_clips);

                        for (int i=0;i<new_clips.size();i++) {
                            ta->add_clips(sequence, new_clips);
                        }
                    }
                } else {
                    // move clips
                    // TODO can we do this better than 3 consecutive for loops?
                    if (panel_timeline->tool == TIMELINE_TOOL_POINTER) {
                        QVector<Selection> delete_areas;
                        for (int i=0;i<panel_timeline->ghosts.size();i++) {
                            // step 1 - set clips that are moving to "undeletable" (to avoid step 2 deleting any part of them)
                            const Ghost& g = panel_timeline->ghosts.at(i);

                            sequence->get_clip(g.clip)->undeletable = true;

                            Selection s;
                            s.in = g.in;
                            s.out = g.out;
                            s.track = g.track;
                            delete_areas.append(s);
                        }
                        panel_timeline->delete_areas_and_relink(ta, delete_areas);
                        for (int i=0;i<panel_timeline->ghosts.size();i++) {
                            sequence->get_clip(panel_timeline->ghosts[i].clip)->undeletable = false;
                        }
                    }
                    for (int i=0;i<panel_timeline->ghosts.size();i++) {
                        Ghost& g = panel_timeline->ghosts[i];

                        // step 3 - move clips
                        ta->increase_timeline_in(sequence, g.clip, g.in - g.old_in);
                        ta->increase_timeline_out(sequence, g.clip, g.out - g.old_out);
                        ta->increase_track(sequence, g.clip, g.track - g.old_track);
                        ta->increase_clip_in(sequence, g.clip, g.clip_in - g.old_clip_in);
                    }
                }

                undo_stack.push(ta);

                panel_timeline->redraw_all_clips(true);
            } else if (panel_timeline->selecting || panel_timeline->rect_select_proc) {
                repaint = true;
            } else if (panel_timeline->splitting) {
                TimelineAction* ta = new TimelineAction();
                bool split = false;
                for (int i=0;i<panel_timeline->split_tracks.size();i++) {
                    int split_index = getClipIndexFromCoords(panel_timeline->drag_frame_start, panel_timeline->split_tracks.at(i));
                    if (split_index > -1 && panel_timeline->split_clip_and_relink(ta, split_index, panel_timeline->drag_frame_start, !alt)) {
                        split = true;
                    }
                }
                if (split) {
                    undo_stack.push(ta);
                    panel_timeline->redraw_all_clips(true);
                } else {
                    delete ta;
                }
                panel_timeline->split_cache.clear();
            }

            // remove duplicate selections
            panel_timeline->clean_up_selections(panel_timeline->selections);

            // destroy all ghosts
            panel_timeline->ghosts.clear();

            // clear split tracks
            panel_timeline->split_tracks.clear();

            panel_timeline->selecting = false;
            panel_timeline->moving_proc = false;
            panel_timeline->moving_init = false;
            panel_timeline->splitting = false;
            panel_timeline->snapped = false;
            panel_timeline->rect_select_init = false;
            panel_timeline->rect_select_proc = false;
            pre_clips.clear();
            post_clips.clear();

            if (repaint) panel_timeline->repaint_timeline();

            // SEND CLIPS TO EFFECT CONTROLS
            // find out how many clips are selected
            // limits to one video clip and one audio clip and only if they're linked
            // one of these days it might be nice to have multiple clips in the effects panel
            bool got_vclip = false;
            bool got_aclip = false;
            int vclip = -1;
            int aclip = -1;
            for (int i=0;i<sequence->clip_count();i++) {
                Clip* clip = sequence->get_clip(i);
                if (clip != NULL && panel_timeline->is_clip_selected(clip, true)) {
                    if (clip->track < 0) {
                        if (got_vclip) {
                            vclip = -1;
                        } else {
                            vclip = i;
                            got_vclip = true;
                        }
                    } else {
                        if (got_aclip) {
                            aclip = -1;
                        } else {
                            aclip = i;
                            got_aclip = true;
                        }
                    }
                }
            }
            // check if aclip is linked to vclip
            QVector<int> selected_clips;
            if (vclip != -1) selected_clips.append(vclip);
            if (aclip != -1) selected_clips.append(aclip);
            if (vclip != -1 && aclip != -1) {
                bool found = false;
                Clip* vclip_ref = sequence->get_clip(vclip);
                for (int i=0;i<vclip_ref->linked.size();i++) {
                    if (vclip_ref->linked.at(i) == aclip) {
                        found = true;
                        break;
                    }
                }
                if (!found) {
                    // only display multiple clips if they're linked
                    selected_clips.clear();
                }
            }
            panel_effect_controls->set_clips(selected_clips);
        }
    }
}

void TimelineWidget::init_ghosts() {
	for (int i=0;i<panel_timeline->ghosts.size();i++) {
		Ghost& g = panel_timeline->ghosts[i];
        Clip* c = sequence->get_clip(g.clip);
        g.in = g.old_in = c->timeline_in;
        g.out = g.old_out = c->timeline_out;
        g.track = g.old_track = c->track;
        g.clip_in = g.old_clip_in = c->clip_in;
        g.ghost_length = g.old_out - g.old_in;

        if (panel_timeline->trim_target > -1 || panel_timeline->tool == TIMELINE_TOOL_SLIP || panel_timeline->tool == TIMELINE_TOOL_SLIDE) {
			// used for trim ops
            g.media_length = sequence->get_clip(g.clip)->media->get_length_in_frames(sequence->frame_rate);
		}
	}
	for (int i=0;i<panel_timeline->selections.size();i++) {
		Selection& s = panel_timeline->selections[i];
		s.old_in = s.in;
		s.old_out = s.out;
		s.old_track = s.track;
	}
}

bool subvalidate_snapping(const Ghost& g, long* frame_diff, long snap_point) {
    int snap_range = panel_timeline->get_snap_range();
    long in_validator = g.old_in + *frame_diff - snap_point;
    long out_validator = g.old_out + *frame_diff - snap_point;

    if ((panel_timeline->trim_target == -1 || g.trim_in) && in_validator > -snap_range && in_validator < snap_range) {
        *frame_diff -= in_validator;
        panel_timeline->snap_point = snap_point;
        panel_timeline->snapped = true;
        return true;
    } else if (!g.trim_in && out_validator > -snap_range && out_validator < snap_range) {
        *frame_diff -= out_validator;
        panel_timeline->snap_point = snap_point;
        panel_timeline->snapped = true;
        return true;
    }
    return false;
}

void validate_snapping(const Ghost& g, long* frame_diff) {
    if (panel_timeline->snapping) {
        bool snap_to_clip = true;
        if (!panel_timeline->playing) {
            snap_to_clip = !subvalidate_snapping(g, frame_diff, panel_timeline->playhead);
        }
        if (snap_to_clip) {
            for (int j=0;j<sequence->clip_count();j++) {
                Clip* c = sequence->get_clip(j);
                if (c != NULL) {
                    if (!subvalidate_snapping(g, frame_diff, c->timeline_in)) {
                        subvalidate_snapping(g, frame_diff, c->timeline_out);
                    }
                    if (panel_timeline->snapped) break;
                }
            }
        }
    }
}

void TimelineWidget::update_ghosts(QPoint& mouse_pos) {
	int mouse_track = getTrackFromScreenPoint(mouse_pos.y());
    long frame_diff = panel_timeline->getFrameFromScreenPoint(mouse_pos.x()) - panel_timeline->drag_frame_start;
    int track_diff = (panel_timeline->tool == TIMELINE_TOOL_SLIDE) ? 0 : mouse_track - panel_timeline->drag_track_start;
    long validator;

    // first try to snap
    panel_timeline->snapped = false;
    if (panel_timeline->tool != TIMELINE_TOOL_SLIP) {
        // slipping doesn't move the clips so we don't bother snapping for it
        for (int i=0;i<panel_timeline->ghosts.size();i++) {
            Ghost& g = panel_timeline->ghosts[i];
            validate_snapping(g, &frame_diff);
            if (panel_timeline->snapped) break;
        }
    }

    bool clips_are_movable = (panel_timeline->tool == TIMELINE_TOOL_POINTER || panel_timeline->tool == TIMELINE_TOOL_SLIDE || panel_timeline->importing);

    // validate ghosts
    long temp_frame_diff = frame_diff; // cache to see if we change it (thus cancelling any snap)
    for (int i=0;i<panel_timeline->ghosts.size();i++) {
        const Ghost& g = panel_timeline->ghosts.at(i);
        Clip* c = NULL;
        if (g.clip != -1) c = sequence->get_clip(g.clip);

        // validate ghosts for trimming
        if (panel_timeline->tool == TIMELINE_TOOL_SLIP) {
            if (!c->media->get_stream_from_file_index(c->media_stream)->infinite_length) {
                // prevent slip moving a clip below 0 clip_in
                validator = g.old_clip_in - frame_diff;
                if (validator < 0) frame_diff += validator;

                // prevent slip moving clip beyond media length
                validator += g.ghost_length;
                if (validator > g.media_length) frame_diff += validator - g.media_length;
            }
        } else if (g.trimming) {
            if (g.trim_in) {
                // prevent clip length from being less than 1 frame long
                validator = g.ghost_length - frame_diff;
                if (validator < 1) frame_diff -= (1 - validator);

                // prevent timeline in from going below 0
                validator = g.old_in + frame_diff;
                if (validator < 0) frame_diff -= validator;

                // prevent clip_in from going below 0
                if (!c->media->get_stream_from_file_index(c->media_stream)->infinite_length) {
                    validator = g.old_clip_in + frame_diff;
                    if (validator < 0) frame_diff -= validator;
                }
            } else {
                // prevent clip length from being less than 1 frame long
                validator = g.ghost_length + frame_diff;
                if (validator < 1) frame_diff += (1 - validator);

                // prevent clip length exceeding media length
                if (!c->media->get_stream_from_file_index(c->media_stream)->infinite_length) {
                    validator = g.old_clip_in + g.ghost_length + frame_diff;
                    if (validator > g.media_length) frame_diff -= validator - g.media_length;
                }
            }

            // ripple ops
            if (panel_timeline->tool == TIMELINE_TOOL_RIPPLE) {
                for (int j=0;j<post_clips.size();j++) {
                    Clip* post = post_clips.at(j);

                    // prevent any rippled clip from going below 0
                    if (panel_timeline->trim_in_point) {
                        validator = post->timeline_in - frame_diff;
                        if (validator < 0) frame_diff += validator;
                    }

                    // prevent any post-clips colliding with pre-clips
                    for (int k=0;k<pre_clips.size();k++) {
                        Clip* pre = pre_clips.at(k);
                        if (pre != post && pre->track == post->track) {
                            if (panel_timeline->trim_in_point) {
                                validator = post->timeline_in - frame_diff - pre->timeline_out;
                                if (validator < 0) frame_diff += validator;
                            } else {
                                validator = post->timeline_in + frame_diff - pre->timeline_out;
                                if (validator < 0) frame_diff -= validator;
                            }
                        }
                    }
                }
            }
        } else if (clips_are_movable) { // validate ghosts for moving
            // prevent clips from moving below 0 on the timeline
            validator = g.old_in + frame_diff;
            if (validator < 0) frame_diff -= validator;

            // prevent clips from crossing tracks
            if (same_sign(g.old_track, panel_timeline->drag_track_start)) {
                while (!same_sign(g.old_track, g.old_track + track_diff)) {
                    if (g.old_track < 0) {
                        track_diff--;
                    } else {
                        track_diff++;
                    }
                }
            }
        }
    }
    if (temp_frame_diff != frame_diff) panel_timeline->snapped = false;

    // apply changes to ghosts
    for (int i=0;i<panel_timeline->ghosts.size();i++) {
        Ghost& g = panel_timeline->ghosts[i];

        if (panel_timeline->tool == TIMELINE_TOOL_SLIP) {
            g.clip_in = g.old_clip_in - frame_diff;
        } else if (g.trimming) {
            if (g.trim_in) {
                g.in = g.old_in + frame_diff;
                g.clip_in = g.old_clip_in + frame_diff;
            } else {
                g.out = g.old_out + frame_diff;
            }
        } else if (clips_are_movable) {
            g.track = g.old_track;
            g.in = g.old_in + frame_diff;
            g.out = g.old_out + frame_diff;

            if (panel_timeline->importing) {
                int abs_track_diff = abs(track_diff);
                if (g.old_track < 0) { // clip is video
                    g.track -= abs_track_diff;
                } else { // clip is audio
                    g.track += abs_track_diff;
                }
            } else if (same_sign(g.old_track, panel_timeline->drag_track_start)) {
                g.track += track_diff;
            }
        }
    }

    // apply changes to selections
    if (panel_timeline->tool != TIMELINE_TOOL_SLIP && !panel_timeline->importing) {
        for (int i=0;i<panel_timeline->selections.size();i++) {
            Selection& s = panel_timeline->selections[i];
            if (panel_timeline->trim_target > -1) {
                if (panel_timeline->trim_in_point) {
                    s.in = s.old_in + frame_diff;
                } else {
                    s.out = s.old_out + frame_diff;
                }
            } else {
                for (int i=0;i<panel_timeline->selections.size();i++) {
                    Selection& s = panel_timeline->selections[i];
                    s.in = s.old_in + frame_diff;
                    s.out = s.old_out + frame_diff;
                    s.track = s.old_track;
                    if (panel_timeline->importing) {
                        int abs_track_diff = abs(track_diff);
                        if (s.old_track < 0) {
                            s.track -= abs_track_diff;
                        } else {
                            s.track += abs_track_diff;
                        }
                    } else {
                        if (same_sign(s.track, panel_timeline->drag_track_start)) s.track += track_diff;
                    }
                }
            }
        }
    }
}

void TimelineWidget::mouseMoveEvent(QMouseEvent *event) {
    if (sequence != NULL) {
        bool alt = (event->modifiers() & Qt::AltModifier);

        panel_timeline->cursor_frame = panel_timeline->getFrameFromScreenPoint(event->pos().x());
        panel_timeline->cursor_track = getTrackFromScreenPoint(event->pos().y());

        if (panel_timeline->tool == TIMELINE_TOOL_EDIT || panel_timeline->tool == TIMELINE_TOOL_RAZOR) {
            panel_timeline->snap_to_clip(&panel_timeline->cursor_frame, !config.edit_tool_also_seeks || !panel_timeline->selecting);
        }
        if (panel_timeline->selecting) {
            int selection_count = 1 + qMax(panel_timeline->cursor_track, panel_timeline->drag_track_start) - qMin(panel_timeline->cursor_track, panel_timeline->drag_track_start) + panel_timeline->selection_offset;
            if (panel_timeline->selections.size() != selection_count) {
                panel_timeline->selections.resize(selection_count);
            }
            int minimum_selection_track = qMin(panel_timeline->cursor_track, panel_timeline->drag_track_start);
            for (int i=panel_timeline->selection_offset;i<selection_count;i++) {
                Selection& s = panel_timeline->selections[i];
                s.track = minimum_selection_track + i - panel_timeline->selection_offset;
                long in = panel_timeline->drag_frame_start;
                long out = panel_timeline->cursor_frame;
                s.in = qMin(in, out);
                s.out = qMax(in, out);
            }

            // select linked clips too
            if (config.edit_tool_selects_links) {
                for (int j=0;j<sequence->clip_count();j++) {
                    Clip* c = sequence->get_clip(j);
                    for (int k=0;k<panel_timeline->selections.size();k++) {
                        const Selection& s = panel_timeline->selections.at(k);
                        if (!(c->timeline_in < s.in && c->timeline_out < s.in) &&
                                !(c->timeline_in > s.out && c->timeline_out > s.out) &&
                                c->track == s.track) {

                            QVector<int> linked_tracks = panel_timeline->get_tracks_of_linked_clips(j);
                            for (int k=0;k<linked_tracks.size();k++) {
                                bool found = false;
                                for (int l=0;l<panel_timeline->selections.size();l++) {
                                    const Selection& test_sel = panel_timeline->selections.at(l);
                                    if (test_sel.track == linked_tracks.at(k) &&
                                            test_sel.in == s.in &&
                                            test_sel.out == s.out) {
                                        found = true;
                                        break;
                                    }
                                }
                                if (!found) {
                                    Selection link_sel = {s.in, s.out, linked_tracks.at(k)};
                                    panel_timeline->selections.append(link_sel);
                                }
                            }

                            break;
                        }
                    }
                }
            }

            if (config.edit_tool_also_seeks) {
                panel_timeline->seek(qMin(panel_timeline->drag_frame_start, panel_timeline->cursor_frame));
            } else {
                panel_timeline->repaint_timeline();
            }
        } else if (panel_timeline->moving_init) {
            if (track_resizing) {
                int diff = track_resize_mouse_cache - event->pos().y();
                int new_height = track_resize_old_value;
                if (bottom_align) {
                    new_height += diff;
                } else {
                    new_height -= diff;
                }
                if (new_height < TRACK_MIN_HEIGHT) new_height = TRACK_MIN_HEIGHT;
                panel_timeline->calculate_track_height(track_target, new_height);
                redraw_clips();
            } else if (panel_timeline->moving_proc) {
                QPoint pos = event->pos();
                update_ghosts(pos);
            } else {
                // set up movement
                // create ghosts
                for (int i=0;i<sequence->clip_count();i++) {
                    Clip* c = sequence->get_clip(i);
                    if (c != NULL && panel_timeline->is_clip_selected(c, true)) {
                        Ghost g;
                        g.clip = i;
                        g.trimming = (panel_timeline->trim_target > -1);
                        g.trim_in = panel_timeline->trim_in_point;
                        panel_timeline->ghosts.append(g);
                    }
                }

                int size = panel_timeline->ghosts.size();
                if (panel_timeline->tool == TIMELINE_TOOL_ROLLING) {
                    for (int i=0;i<size;i++) {
                        Clip* ghost_clip = sequence->get_clip(panel_timeline->ghosts.at(i).clip);

                        // see if any ghosts are touching, in which case flip them
                        for (int k=0;k<size;k++) {
                            Clip* comp_clip = sequence->get_clip(panel_timeline->ghosts.at(k).clip);
                            if ((panel_timeline->trim_in_point && comp_clip->timeline_out == ghost_clip->timeline_in) ||
                                    (!panel_timeline->trim_in_point && comp_clip->timeline_in == ghost_clip->timeline_out)) {
                                panel_timeline->ghosts[k].trim_in = !panel_timeline->trim_in_point;
                            }
                        }
                    }

                    // then look for other clips we're touching
                    for (int i=0;i<size;i++) {
                        const Ghost& g = panel_timeline->ghosts.at(i);
                        Clip* ghost_clip = sequence->get_clip(g.clip);
                        for (int j=0;j<sequence->clip_count();j++) {
                            Clip* comp_clip = sequence->get_clip(j);
                            if (comp_clip->track == ghost_clip->track) {
                                if ((panel_timeline->trim_in_point && comp_clip->timeline_out == ghost_clip->timeline_in) ||
                                        (!panel_timeline->trim_in_point && comp_clip->timeline_in == ghost_clip->timeline_out)) {
                                    // see if this clip is already selected, and if so just switch the trim_in
                                    bool found = false;
                                    int duplicate_ghost_index;
                                    for (duplicate_ghost_index=0;duplicate_ghost_index<size;duplicate_ghost_index++) {
                                        if (panel_timeline->ghosts.at(duplicate_ghost_index).clip == j) {
                                            found = true;
                                            break;
                                        }
                                    }
                                    if (g.trim_in == panel_timeline->trim_in_point) {
                                        if (!found) {
                                            // add ghost for this clip with opposite trim_in
                                            Ghost gh;
                                            gh.clip = j;
                                            gh.trimming = (panel_timeline->trim_target > -1);
                                            gh.trim_in = !panel_timeline->trim_in_point;
                                            panel_timeline->ghosts.append(gh);
                                        }
                                    } else {
                                        if (found) {
                                            panel_timeline->ghosts.removeAt(duplicate_ghost_index);
                                            size--;
                                            if (duplicate_ghost_index < i) i--;
                                        }
                                    }
                                }
                            }
                        }
                    }
                } else if (panel_timeline->tool == TIMELINE_TOOL_SLIDE) {
                    for (int i=0;i<size;i++) {
                        const Ghost& g = panel_timeline->ghosts.at(i);
                        Clip* ghost_clip = sequence->get_clip(g.clip);
                        panel_timeline->ghosts[i].trimming = false;
                        for (int j=0;j<sequence->clip_count();j++) {
                            Clip* c = sequence->get_clip(j);
                            if (c->track == ghost_clip->track) {
                                bool found = false;
                                for (int k=0;k<size;k++) {
                                    if (panel_timeline->ghosts.at(k).clip == j) {
                                        found = true;
                                        break;
                                    }
                                }
                                if (!found) {
                                    bool is_in = (c->timeline_in == ghost_clip->timeline_out);
                                    if (is_in || c->timeline_out == ghost_clip->timeline_in) {
                                        Ghost gh;
                                        gh.clip = j;
                                        gh.trimming = true;
                                        gh.trim_in = is_in;
                                        panel_timeline->ghosts.append(gh);
                                    }
                                }
                            }
                        }
                    }
                }

                init_ghosts();

                // ripple edit prep
                if (panel_timeline->tool == TIMELINE_TOOL_RIPPLE) {
                    QVector<Clip*> axis_ghosts;
                    for (int i=0;i<panel_timeline->ghosts.size();i++) {
                        Clip* c = sequence->get_clip(panel_timeline->ghosts.at(i).clip);
                        bool found = false;
                        for (int j=0;j<axis_ghosts.size();j++) {
                            Clip* cc = axis_ghosts.at(j);
                            if (c->track == cc->track &&
                                    ((panel_timeline->trim_in_point && c->timeline_in < cc->timeline_in) ||
                                     (!panel_timeline->trim_in_point && c->timeline_out > cc->timeline_out))) {
                                axis_ghosts[j] = c;
                                found = true;
                                break;
                            }
                        }
                        if (!found) {
                            axis_ghosts.append(c);
                        }
                    }

                    for (int i=0;i<sequence->clip_count();i++) {
                        Clip* c = sequence->get_clip(i);
                        if (c != NULL && !panel_timeline->is_clip_selected(c, true)) {
                            for (int j=0;j<axis_ghosts.size();j++) {
                                Clip* axis = axis_ghosts.at(j);
                                long comp_point = (panel_timeline->trim_in_point) ? axis->timeline_in : axis->timeline_out;
                                bool clip_is_pre = (c->timeline_in < comp_point);
                                QVector<Clip*>& clip_list = clip_is_pre ? pre_clips : post_clips;
                                bool found = false;
                                for (int k=0;k<clip_list.size();k++) {
                                    Clip* cached = clip_list.at(k);
                                    if (cached->track == c->track) {
                                        if (clip_is_pre == (c->timeline_in > cached->timeline_in)) {
                                            clip_list[k] = c;
                                        }
                                        found = true;
                                        break;
                                    }
                                }
                                if (!found) {
                                    clip_list.append(c);
                                }
                            }
                        }
                    }
                }

                panel_timeline->moving_proc = true;
            }
            panel_timeline->repaint_timeline();
        } else if (panel_timeline->splitting) {
            int track_start = qMin(panel_timeline->cursor_track, panel_timeline->drag_track_start);
            int track_end = qMax(panel_timeline->cursor_track, panel_timeline->drag_track_start);
            int track_size = 1 + track_end - track_start;
            panel_timeline->split_tracks.resize(track_size);
            for (int i=0;i<track_size;i++) {
                panel_timeline->split_tracks[i] = track_start + i;
            }

            if (!alt) {
                for (int i=0;i<track_size;i++) {
                    int clip_index = getClipIndexFromCoords(panel_timeline->drag_frame_start, panel_timeline->split_tracks[i]);
                    if (clip_index > -1) {
                        QVector<int> tracks = panel_timeline->get_tracks_of_linked_clips(clip_index);
                        for (int j=0;j<tracks.size();j++) {
                            // check if this track is already included
                            if (tracks.at(j) < track_start || tracks.at(j) > track_end) {
                                panel_timeline->split_tracks.append(tracks.at(j));
                            }
                        }
                    }
                }
            }
            panel_timeline->repaint_timeline();
        } else if (panel_timeline->rect_select_init) {
            if (panel_timeline->rect_select_proc) {
                panel_timeline->rect_select_w = event->pos().x() - panel_timeline->rect_select_x;
                panel_timeline->rect_select_h = event->pos().y() - panel_timeline->rect_select_y;
                if (bottom_align) panel_timeline->rect_select_h -= height();

                long frame_start = panel_timeline->getFrameFromScreenPoint(panel_timeline->rect_select_x);
                long frame_end = panel_timeline->getFrameFromScreenPoint(event->pos().x());
                long frame_min = qMin(frame_start, frame_end);
                long frame_max = qMax(frame_start, frame_end);

                int rsy = panel_timeline->rect_select_y;
                if (bottom_align) rsy += height();
                int track_start = getTrackFromScreenPoint(rsy);
                int track_end = getTrackFromScreenPoint(event->pos().y());
                int track_min = qMin(track_start, track_end);
                int track_max = qMax(track_start, track_end);

                QVector<Clip*> selected_clips;
                for (int i=0;i<sequence->clip_count();i++) {
                    Clip* clip = sequence->get_clip(i);
                    if (clip != NULL &&
                            clip->track >= track_min &&
                            clip->track <= track_max &&
                            !(clip->timeline_in < frame_min && clip->timeline_out < frame_min) &&
                            !(clip->timeline_in > frame_max && clip->timeline_out > frame_max)) {
                        QVector<Clip*> session_clips;
                        session_clips.append(clip);

                        if (!alt) {
                            for (int j=0;j<clip->linked.size();j++) {
                                session_clips.append(sequence->get_clip(clip->linked.at(j)));
                            }
                        }

                        for (int j=0;j<session_clips.size();j++) {
                            // see if clip has already been added - this can easily happen due to adding linked clips
                            bool found = false;
                            Clip* c = session_clips.at(j);
                            for (int k=0;k<selected_clips.size();k++) {
                                if (selected_clips.at(k) == c) {
                                    found = true;
                                    break;
                                }
                            }
                            if (!found) {
                                selected_clips.append(c);
                            }
                        }
                    }
                }

                panel_timeline->selections.resize(selected_clips.size() + panel_timeline->selection_offset);
                for (int i=0;i<selected_clips.size();i++) {
                    Selection& s = panel_timeline->selections[i+panel_timeline->selection_offset];
                    Clip* clip = selected_clips.at(i);
                    s.old_in = s.in = clip->timeline_in;
                    s.old_out = s.out = clip->timeline_out;
                    s.old_track = s.track = clip->track;
                }

                panel_timeline->repaint_timeline();
            } else {
                panel_timeline->rect_select_x = event->pos().x();
                panel_timeline->rect_select_y = event->pos().y();
                if (bottom_align) panel_timeline->rect_select_y -= height();
                panel_timeline->rect_select_w = 0;
                panel_timeline->rect_select_h = 0;
                panel_timeline->rect_select_proc = true;
            }
        } else if (panel_timeline->tool == TIMELINE_TOOL_POINTER ||
                   panel_timeline->tool == TIMELINE_TOOL_RIPPLE ||
                   panel_timeline->tool == TIMELINE_TOOL_ROLLING) {
            track_resizing = false;

            QPoint pos = event->pos();

            int lim = 5;
            int mouse_track = getTrackFromScreenPoint(pos.y());
            long mouse_frame_lower = panel_timeline->getFrameFromScreenPoint(pos.x()-lim)-1;
            long mouse_frame_upper = panel_timeline->getFrameFromScreenPoint(pos.x()+lim)+1;
            bool found = false;
            bool cursor_contains_clip = false;
            int closeness = INT_MAX;
            for (int i=0;i<sequence->clip_count();i++) {
                Clip* c = sequence->get_clip(i);
                if (c != NULL && c->track == mouse_track) {
                    if (panel_timeline->cursor_frame >= c->timeline_in &&
                            panel_timeline->cursor_frame <= c->timeline_out) {
                        cursor_contains_clip = true;
                    }
                    if (c->timeline_in > mouse_frame_lower && c->timeline_in < mouse_frame_upper) {
                        int nc = qAbs(c->timeline_in + 1 - panel_timeline->cursor_frame);
                        if (nc < closeness) {
                            panel_timeline->trim_target = i;
                            panel_timeline->trim_in_point = true;
                            closeness = nc;
                            found = true;
                        }
                    }
                    if (c->timeline_out > mouse_frame_lower && c->timeline_out < mouse_frame_upper) {
                        int nc = qAbs(c->timeline_out - 1 - panel_timeline->cursor_frame);
                        if (nc < closeness) {
                            panel_timeline->trim_target = i;
                            panel_timeline->trim_in_point = false;
                            closeness = nc;
                            found = true;
                        }
                    }
                }
            }
            if (found) {
                setCursor(Qt::SizeHorCursor);
            } else {
                panel_timeline->trim_target = -1;

                // look for track heights
                int track_y = 0;
                for (int i=0;i<panel_timeline->get_track_height_size(bottom_align);i++) {
                    int track = (bottom_align) ? -1-i : i;
                    int track_height = panel_timeline->calculate_track_height(track, -1);
                    track_y += track_height;
                    int y_test_value = (bottom_align) ? rect().bottom() - track_y : track_y;
                    int test_range = 5;
                    if (pos.y() > y_test_value-test_range && pos.y() < y_test_value+test_range) {
                        // if track lines are hidden, only resize track if a clip is already there
                        if (config.show_track_lines || cursor_contains_clip) {
                            found = true;
                            track_resizing = true;
                            track_target = track;
                            track_resize_old_value = track_height;
                        }
                        break;
                    }
                }

                if (found) {
                    setCursor(Qt::SizeVerCursor);
                } else {
                    unsetCursor();
                }
            }
        } else if (panel_timeline->tool == TIMELINE_TOOL_EDIT || panel_timeline->tool == TIMELINE_TOOL_RAZOR) {
            // redraw because we have a cursor
            panel_timeline->repaint_timeline();
        } else if (panel_timeline->tool == TIMELINE_TOOL_SLIP) {
            if (getClipIndexFromCoords(panel_timeline->cursor_frame, panel_timeline->cursor_track) > -1) {
                setCursor(Qt::SizeHorCursor);
            } else {
                unsetCursor();
            }
        }
    }
}

int color_brightness(int r, int g, int b) {
	return (0.2126*r + 0.7152*g + 0.0722*b);
}

void TimelineWidget::redraw_clips() {
    // Draw clips
    if (sequence != NULL) {
        int panel_width = panel_timeline->getScreenPointFromFrame(sequence->getEndFrame()) + 100;

        if (minimumWidth() != panel_width || clip_pixmap.height() != height()) {
            setMinimumWidth(panel_width);
            clip_pixmap = QPixmap(qMax(width(), panel_width), height());
        }

        clip_pixmap.fill(Qt::transparent);
        QPainter clip_painter(&clip_pixmap);
        int video_track_limit = 0;
        int audio_track_limit = 0;
        QColor transition_color(255, 0, 0, 16);
        for (int i=0;i<sequence->clip_count();i++) {
            Clip* clip = sequence->get_clip(i);
            if (clip != NULL && is_track_visible(clip->track)) {
                if (clip->track < 0 && clip->track < video_track_limit) { // video clip
                    video_track_limit = clip->track;
                } else if (clip->track > audio_track_limit) {
                    audio_track_limit = clip->track;
                }

                QRect clip_rect(panel_timeline->getScreenPointFromFrame(clip->timeline_in), getScreenPointFromTrack(clip->track), clip->getLength() * panel_timeline->zoom, panel_timeline->calculate_track_height(clip->track, -1));
                clip_painter.fillRect(clip_rect, QColor(clip->color_r, clip->color_g, clip->color_b));

                int thumb_x = clip_rect.x() + 1;

                QRect text_rect(clip_rect.left() + CLIP_TEXT_PADDING, clip_rect.top() + CLIP_TEXT_PADDING, clip_rect.width() - CLIP_TEXT_PADDING - 1, clip_rect.height() - CLIP_TEXT_PADDING - 1);

                // draw clip transitions
                for (char i=0;i<2;i++) {
                    Transition* t;
                    if (i == 0) {
                        t = clip->opening_transition;
                    } else {
                        t = clip->closing_transition;
                    }
                    if (t != NULL) {
                        int transition_width = panel_timeline->getScreenPointFromFrame(t->length);
                        int transition_height = clip_rect.height() * 0.6;
                        if (transition_height <= TRACK_MIN_HEIGHT) {
                            transition_height = clip_rect.height();
                        }
                        int tr_y = clip_rect.y() + ((clip_rect.height()-transition_height)/2);
                        int tr_x = 0;
                        if (i == 0) {
                            tr_x = clip_rect.x();
                            text_rect.setX(text_rect.x()+transition_width);
                            thumb_x += transition_width;
                        } else {
                            tr_x = clip_rect.right()-transition_width;
                            text_rect.setWidth(text_rect.width()-transition_width);
                        }
                        QRect transition_rect = QRect(tr_x, tr_y, transition_width, transition_height);
                        clip_painter.fillRect(transition_rect, transition_color);
                        QRect transition_text_rect(transition_rect.x() + CLIP_TEXT_PADDING, transition_rect.y() + CLIP_TEXT_PADDING, transition_rect.width() - CLIP_TEXT_PADDING, transition_rect.height() - CLIP_TEXT_PADDING);
                        if (transition_text_rect.width() > MAX_TEXT_WIDTH) {
                            clip_painter.setPen(QColor(0, 0, 0, 96));
                            if (i == 0) {
                                clip_painter.drawLine(transition_rect.bottomLeft(), transition_rect.topRight());
                            } else {
                                clip_painter.drawLine(transition_rect.topLeft(), transition_rect.bottomRight());
                            }

                            clip_painter.setPen(Qt::white);
                            clip_painter.drawText(transition_text_rect, 0, t->name, &transition_text_rect);
                        }
                        clip_painter.setPen(Qt::black);
                        clip_painter.drawRect(transition_rect);
                    }
                }

                MediaStream* ms = clip->media->get_stream_from_file_index(clip->media_stream);
                if (ms == NULL) {
                    // draw "error lines" if media stream is missing
                    clip_painter.setPen(QPen(QColor(64, 64, 64), 2));
                    int limit = clip_rect.width();
                    int clip_height = clip_rect.bottom()-clip_rect.top();
                    for (int j=-clip_height;j<limit;j+=15) {
                        int lines_start_x = clip_rect.left()+j;
                        int lines_start_y = clip_rect.bottom();
                        int lines_end_x = lines_start_x + clip_height;
                        int lines_end_y = clip_rect.top();
                        if (lines_start_x < clip_rect.left()) {
                            lines_start_y -= (clip_rect.left() - lines_start_x);
                            lines_start_x = clip_rect.left();
                        }
                        if (lines_end_x > clip_rect.right()) {
                            lines_end_y -= (clip_rect.right() - lines_end_x);
                            lines_end_x = clip_rect.right();
                        }
                        clip_painter.drawLine(lines_start_x, lines_start_y, lines_end_x, lines_end_y);
                    }
                } else if (ms->preview_done) {
                    // draw thumbnail/waveform
                    if (clip->track < 0) {
                        int thumb_y = clip_painter.fontMetrics().height()+CLIP_TEXT_PADDING+CLIP_TEXT_PADDING;
                        int thumb_height = clip_rect.height()-thumb_y;
                        int thumb_width = (thumb_height*((double)ms->video_preview.width()/(double)ms->video_preview.height()));
                        if (thumb_height > thumb_y && text_rect.width() + CLIP_TEXT_PADDING > thumb_width) { // at small clip heights, don't even draw it
                            QRect thumb_rect(thumb_x, clip_rect.y()+thumb_y, thumb_width, thumb_height);
                            clip_painter.drawImage(thumb_rect, ms->video_preview);
                        }
                    } else if (clip_rect.height() > TRACK_MIN_HEIGHT) {
                        int divider = ms->audio_channels*2;

                        clip_painter.setPen(QColor(80, 80, 80));
                        int channel_height = clip_rect.height()/ms->audio_channels;
                        long media_length = clip->media->get_length_in_frames(clip->sequence->frame_rate);
                        for (int i=0;i<clip_rect.width();i++) {
                            int waveform_index = qFloor((((clip->clip_in + ((double) i/panel_timeline->zoom))/media_length) * ms->audio_preview.size())/divider)*divider;

                            for (int j=0;j<ms->audio_channels;j++) {
                                int mid = clip_rect.top()+channel_height*j+(channel_height/2);
                                int offset = waveform_index+(j*2);

                                qint8 min = (double)ms->audio_preview.at(offset) / 128.0 * (channel_height/2);
                                qint8 max = (double)ms->audio_preview.at(offset+1) / 128.0 * (channel_height/2);
                                clip_painter.drawLine(clip_rect.left()+i, mid+min, clip_rect.left()+i, mid+max);

                                /*if (offset >= 0 && offset < ms->audio_preview.size()) {

                                } else {
                                    QMessageBox::critical(this, "AAAAAAAAAAAAA", "Here's that terrible, no-good bug again!!! I've stepped around it but plz report the following to Matt:\n\n" + QString::number(offset) + " vs " + QString::number(clip->media_stream->audio_preview.size()), QMessageBox::Ok);
                                    break;
                                }*/
                            }
                        }
                    }
                }

                // top left bevel
                clip_painter.setPen(Qt::white);
                clip_painter.drawLine(clip_rect.bottomLeft(), clip_rect.topLeft());
                clip_painter.drawLine(clip_rect.topLeft(), clip_rect.topRight());

                // draw text
                if (text_rect.width() > MAX_TEXT_WIDTH) {
                    if (color_brightness(clip->color_r, clip->color_g, clip->color_b) > 160) {
                        // set to black if color is bright
                        clip_painter.setPen(Qt::black);
                    }
                    if (clip->linked.size() > 0) {
                        int underline_y = CLIP_TEXT_PADDING + clip_painter.fontMetrics().height() + clip_rect.top();
                        int underline_width = qMin(text_rect.width() - 1, clip_painter.fontMetrics().width(clip->name));
                        clip_painter.drawLine(text_rect.x(), underline_y, text_rect.x() + underline_width, underline_y);
                    }
                    clip_painter.drawText(text_rect, 0, clip->name, &text_rect);
                }

                // bottom right gray
                clip_painter.setPen(QColor(0, 0, 0, 128));
                clip_painter.drawLine(clip_rect.bottomLeft(), clip_rect.bottomRight());
                clip_painter.drawLine(clip_rect.bottomRight(), clip_rect.topRight());
            }
        }

        // Draw track lines
        if (config.show_track_lines) {
            clip_painter.setPen(QColor(0, 0, 0, 96));
            audio_track_limit++;
            if (video_track_limit == 0) video_track_limit--;

            if (bottom_align) {
                // only draw lines for video tracks
                for (int i=video_track_limit;i<0;i++) {
                    int line_y = getScreenPointFromTrack(i) - 1;
                    clip_painter.drawLine(0, line_y, rect().width(), line_y);
                }
            } else {
                // only draw lines for audio tracks
                for (int i=0;i<audio_track_limit;i++) {
                    // TODO just make i+1?
                    int line_y = getScreenPointFromTrack(i) + panel_timeline->calculate_track_height(i, -1);
                    clip_painter.drawLine(0, line_y, rect().width(), line_y);
                }
            }
        }
    }

	update();
}

void TimelineWidget::paintEvent(QPaintEvent*) {
    if (sequence != NULL) {
		QPainter p(this);

        p.drawPixmap(0, 0, clip_pixmap.width(), height(), clip_pixmap);

		// Draw selections
		for (int i=0;i<panel_timeline->selections.size();i++) {
			const Selection& s = panel_timeline->selections.at(i);
			if (is_track_visible(s.track)) {
				int selection_y = getScreenPointFromTrack(s.track);
                int selection_x = panel_timeline->getScreenPointFromFrame(s.in);
                p.fillRect(selection_x, selection_y, panel_timeline->getScreenPointFromFrame(s.out) - selection_x, panel_timeline->calculate_track_height(s.track, -1), QColor(0, 0, 0, 64));
			}
		}

        // draw rectangle select
        if (panel_timeline->rect_select_proc) {
            int rsy = panel_timeline->rect_select_y;
            int rsh = panel_timeline->rect_select_h;
            if (bottom_align) {
                rsy += height();
            }
            QRect rect_select(panel_timeline->rect_select_x, rsy, panel_timeline->rect_select_w, rsh);
            p.setPen(QColor(204, 204, 204));
            p.drawRect(rect_select);
            p.fillRect(rect_select, QColor(0, 0, 0, 32));
        }

		// Draw ghosts
		for (int i=0;i<panel_timeline->ghosts.size();i++) {
			const Ghost& g = panel_timeline->ghosts.at(i);
			if (is_track_visible(g.track)) {
                int ghost_x = panel_timeline->getScreenPointFromFrame(g.in);
				int ghost_y = getScreenPointFromTrack(g.track);
                int ghost_width = panel_timeline->getScreenPointFromFrame(g.out - g.in) - 1;
                int ghost_height = panel_timeline->calculate_track_height(g.track, -1) - 1;
				p.setPen(QColor(255, 255, 0));
				for (int j=0;j<GHOST_THICKNESS;j++) {
					p.drawRect(ghost_x+j, ghost_y+j, ghost_width-j-j, ghost_height-j-j);
				}
			}
		}

        // Draw splitting cursor
        if (panel_timeline->splitting) {
            for (int i=0;i<panel_timeline->split_tracks.size();i++) {
                if (is_track_visible(panel_timeline->split_tracks.at(i))) {
                    int cursor_x = panel_timeline->getScreenPointFromFrame(panel_timeline->drag_frame_start);
                    int cursor_y = getScreenPointFromTrack(panel_timeline->split_tracks.at(i));

                    p.setPen(QColor(64, 64, 64));
                    p.drawLine(cursor_x, cursor_y, cursor_x, cursor_y + panel_timeline->calculate_track_height(panel_timeline->cursor_track, -1));
                }
            }
        }

        // Draw playhead
        p.setPen(Qt::red);
        int playhead_x = panel_timeline->getScreenPointFromFrame(panel_timeline->playhead);
        p.drawLine(playhead_x, rect().top(), playhead_x, rect().bottom());

        // draw border
        p.setPen(QColor(0, 0, 0, 64));
        int edge_y = (bottom_align) ? rect().height()-1 : 0;
        p.drawLine(0, edge_y, rect().width(), edge_y);

        // draw snap point
        if (panel_timeline->snapped) {
            p.setPen(Qt::white);
            int snap_x = panel_timeline->getScreenPointFromFrame(panel_timeline->snap_point);
            p.drawLine(snap_x, 0, snap_x, height());
        }

		// Draw edit cursor
		if (panel_timeline->tool == TIMELINE_TOOL_EDIT || panel_timeline->tool == TIMELINE_TOOL_RAZOR) {
            if (is_track_visible(panel_timeline->cursor_track)) {
                int cursor_x = panel_timeline->getScreenPointFromFrame(panel_timeline->cursor_frame);
                int cursor_y = getScreenPointFromTrack(panel_timeline->cursor_track);

				p.setPen(Qt::gray);
                p.drawLine(cursor_x, cursor_y, cursor_x, cursor_y + panel_timeline->calculate_track_height(panel_timeline->cursor_track, -1));
            }
        }
	}
}

bool TimelineWidget::is_track_visible(int track) {
    return (bottom_align == (track < 0));
}

// **************************************
// screen point <-> frame/track functions
// **************************************

int TimelineWidget::getTrackFromScreenPoint(int y) {
    if (bottom_align) {
        y = -(y - rect().height());
    }
    y--;
    int height_measure = 0;
    int counter = ((!bottom_align && y > 0) || (bottom_align && y < 0)) ? 0 : -1;
    int track_height = panel_timeline->calculate_track_height(counter, -1);
    while (qAbs(y) > height_measure+track_height) {
        if (config.show_track_lines && counter != -1) y--;
        height_measure += track_height;
        if ((!bottom_align && y > 0) || (bottom_align && y < 0)) {
            counter++;
        } else {
            counter--;
        }
        track_height = panel_timeline->calculate_track_height(counter, -1);
    }
    return counter;
}

int TimelineWidget::getScreenPointFromTrack(int track) {
    int y = 0;
    int counter = 0;
    while (counter != track) {
        if (bottom_align) counter--;
        y += panel_timeline->calculate_track_height(counter, -1);
        if (!bottom_align) counter++;
        if (config.show_track_lines && counter != -1) y++;
    }
    y++;
    return (bottom_align) ? rect().height() - y : y;
}

int TimelineWidget::getClipIndexFromCoords(long frame, int track) {
    for (int i=0;i<sequence->clip_count();i++) {
        Clip* c = sequence->get_clip(i);
        if (c != NULL && c->track == track && frame >= c->timeline_in && frame < c->timeline_out) {
            return i;
		}
	}
	return -1;
}