#include "sequence.h"

#include "project/clip.h"

#include <QDebug>

Sequence::Sequence() {
    undo_pointer = -1;
}

Sequence::~Sequence() {
    // dealloc all clips
    for (int i=0;i<clips.size();i++) {
        delete clips.at(i);
    }
}

void Sequence::add_clip(Clip* c) {
    clips.append(c);
}

int Sequence::clip_count() {
    return clips.size();
}

Clip* Sequence::get_clip(int i) {
    return clips.at(i);
}

void Sequence::delete_clip(int i) {
	// remove any potential link references to clip
    for (int j=0;j<clip_count();j++) {
        Clip* c = get_clip(j);
        for (int k=0;k<c->linked.size();k++) {
            if (c->linked[k] == clips[i]) {
                c->linked.removeAt(k);
                break;
            }
        }
    }

	// finally remove from vector
    delete clips.at(i);
	clips.removeAt(i);
}

long Sequence::getEndFrame() {
	long end = 0;
	for (int j=0;j<clip_count();j++) {
        Clip* c = get_clip(j);
        if (c->timeline_out > end) {
            end = c->timeline_out;
		}
	}
	return end;
}

void Sequence::get_track_limits(int* video_tracks, int* audio_tracks) {
	int vt = 0;
	int at = 0;
	for (int j=0;j<clip_count();j++) {
        Clip* c = get_clip(j);
        if (c->track < 0 && c->track < vt) { // video clip
            vt = c->track;
        } else if (c->track > at) {
            at = c->track;
		}
	}
	if (video_tracks != NULL) *video_tracks = vt;
	if (audio_tracks != NULL) *audio_tracks = at;
}

//void Sequence::delete_area(long in, long out, int track) {

//}

Clip* Sequence::split_clip(Clip* pre, long frame) {
    if (pre->timeline_in < frame && pre->timeline_out > frame) { // guard against attempts to split at in/out points
        Clip* post = pre->copy();

        pre->timeline_out = frame;
        post->timeline_in = frame;
        post->clip_in = pre->clip_in + pre->getLength();

        add_clip(post);

        return post;
	}
    return NULL;
}

void Sequence::undo_add_current() {
    if (undo_stack.size() == UNDO_LIMIT) {
        delete undo_stack.at(0);
        undo_stack.removeFirst();
    } else {
        undo_pointer++;
        for (int i=undo_stack.size()-1;i>undo_pointer;i--) {
            delete undo_stack[i];
            undo_stack.removeLast();
        }
    }

    // copy clips
    QVector<Clip*>* copied_clips = new QVector<Clip*>();
    for (int i=0;i<clip_count();i++) {
        copied_clips->append(get_clip(i)->copy());
    }
    undo_stack.append(copied_clips);
}

void Sequence::set_undo(int i) {
    for (int i=0;i<clip_count();i++) {
        delete clips.at(i);
    }
    clips.clear();

    QVector<Clip*>* copy_from_list = undo_stack[undo_pointer];
    for (int i=0;i<copy_from_list->size();i++) {
        add_clip(copy_from_list->at(i));
    }
}

void Sequence::undo() {
    if (undo_pointer > 0) {
        undo_pointer--;
        set_undo(undo_pointer);
    } else {
        qDebug() << "[INFO] No more undos";
    }
}
void Sequence::redo() {
    if (undo_pointer == undo_stack.size() - 1) {
        qDebug() << "[INFO] No more redos";
    } else {
        undo_pointer++;
        set_undo(undo_pointer);
    }
}

// static variable for the currently active sequence
Sequence* sequence = NULL;