/*
 * Olive Community Edition - Non-Linear Video Editor
 * Copyright (C) 2025 Olive CE Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "textv3.h"

#include <QAbstractTextDocumentLayout>
#include <QDateTime>
#include <QTextDocument>

#include "common/html.h"
#include "core.h"
#include "node/project.h"
#include "node/nodeundo.h"

namespace olive
{

#define super ShapeNodeBase

enum TextVerticalAlign {
	kVerticalAlignTop,
	kVerticalAlignCenter,
	kVerticalAlignBottom,
};

const QString TextGeneratorV3::kTextInput = QStringLiteral("text_in");
const QString TextGeneratorV3::kVerticalAlignmentInput =
	QStringLiteral("valign_in");
const QString TextGeneratorV3::kUseArgsInput = QStringLiteral("use_args_in");
const QString TextGeneratorV3::kArgsInput = QStringLiteral("args_in");

TextGeneratorV3::TextGeneratorV3()
	: ShapeNodeBase(false)
	, dont_emit_valign_(false)
{
	AddInput(kTextInput, NodeValue::kText,
			 QStringLiteral("<p style='font-size: 72pt; color: white;'>%1</p>")
				 .arg(tr("Sample Text")));
	SetInputProperty(kTextInput, QStringLiteral("vieweronly"), true);

	SetStandardValue(kSizeInput, QVector2D(400, 300));

	AddInput(kVerticalAlignmentInput, NodeValue::kCombo,
			 InputFlags(kInputFlagHidden | kInputFlagStatic));

	AddInput(kUseArgsInput, NodeValue::kBoolean, true,
			 InputFlags(kInputFlagHidden | kInputFlagStatic));

	AddInput(kArgsInput, NodeValue::kText, InputFlags(kInputFlagArray));
	SetInputProperty(kArgsInput, QStringLiteral("arraystart"), 1);

	text_gizmo_ = new TextGizmo(this);
	text_gizmo_->SetInput(NodeInput(this, kTextInput));
	connect(text_gizmo_, &TextGizmo::Activated, this,
			&TextGeneratorV3::GizmoActivated);
	connect(text_gizmo_, &TextGizmo::Deactivated, this,
			&TextGeneratorV3::GizmoDeactivated);
}

QString TextGeneratorV3::Name() const
{
	return tr("Text");
}

QString TextGeneratorV3::id() const
{
	return QStringLiteral("org.olivevideoeditor.Olive.text3");
}

QVector<Node::CategoryID> TextGeneratorV3::Category() const
{
	return { kCategoryGenerator };
}

QString TextGeneratorV3::Description() const
{
	return tr("Generate rich text.");
}

void TextGeneratorV3::Retranslate()
{
	super::Retranslate();

	SetInputName(kTextInput, tr("Text"));
	SetInputName(kVerticalAlignmentInput, tr("Vertical Alignment"));
	SetComboBoxStrings(kVerticalAlignmentInput,
					   { tr("Top"), tr("Middle"), tr("Bottom") });
	SetInputName(kArgsInput, tr("Arguments"));
}

void TextGeneratorV3::Value(const NodeValueRow &value,
							const NodeGlobals &globals,
							NodeValueTable *table) const
{
	QString text = value[kTextInput].toString();

	if (value[kUseArgsInput].toBool()) {
		auto args = value[kArgsInput].toArray();
		if (!args.empty()) {
			QStringList list;
			list.reserve(args.size());
			for (size_t i = 0; i < args.size(); i++) {
				list.append(args[i].toString());
			}

			text = FormatString(text, list);
		}
	}

	if (!text.isEmpty()) {
		TexturePtr base = value[kTextInput].toTexture();

		VideoParams text_params = base ? base->params() : globals.vparams();
		text_params.set_format(PixelFormat::U8);
		text_params.set_colorspace(
			project()->color_manager()->GetDefaultInputColorSpace());

		GenerateJob job(value);
		job.Insert(kTextInput, NodeValue(NodeValue::kText, text));

		PushMergableJob(value, Texture::Job(text_params, job), table);
	} else if (value[kBaseInput].toTexture()) {
		table->Push(value[kBaseInput]);
	}
}

void TextGeneratorV3::GenerateFrame(FramePtr frame,
									const GenerateJob &job) const
{
	QImage img(reinterpret_cast<uchar *>(frame->data()), frame->width(),
			   frame->height(), frame->linesize_bytes(),
			   QImage::Format_RGBA8888_Premultiplied);
	img.fill(Qt::transparent);

	// 96 DPI in DPM (96 / 2.54 * 100)
	const int dpm = 3780;
	img.setDotsPerMeterX(dpm);
	img.setDotsPerMeterY(dpm);

	QTextDocument text_doc;
	text_doc.documentLayout()->setPaintDevice(&img);

	QString html = job.Get(kTextInput).toString();
	Html::HtmlToDoc(&text_doc, html);

	QVector2D size = job.Get(kSizeInput).toVec2();
	text_doc.setTextWidth(size.x());

	// Draw rich text onto image
	QPainter p(&img);
	p.scale(1.0 / frame->video_params().divider(),
			1.0 / frame->video_params().divider());

	QVector2D pos = job.Get(kPositionInput).toVec2();
	p.translate(pos.x() - size.x() / 2, pos.y() - size.y() / 2);
	p.translate(frame->video_params().width() / 2,
				frame->video_params().height() / 2);
	p.setClipRect(0, 0, size.x(), size.y());

	switch (static_cast<VerticalAlignment>(
		job.Get(kVerticalAlignmentInput).toInt())) {
	case kVAlignTop:
		// Do nothing
		break;
	case kVAlignMiddle:
		p.translate(0, size.y() / 2 - text_doc.size().height() / 2);
		break;
	case kVAlignBottom:
		p.translate(0, size.y() - text_doc.size().height());
		break;
	}

	// Ensure default text color is white
	QAbstractTextDocumentLayout::PaintContext ctx;
	ctx.palette.setColor(QPalette::Text, Qt::white);

	text_doc.documentLayout()->draw(&p, ctx);
}

void TextGeneratorV3::UpdateGizmoPositions(const NodeValueRow &row,
										   const NodeGlobals &globals)
{
	super::UpdateGizmoPositions(row, globals);

	QRectF rect = poly_gizmo()->GetPolygon().boundingRect();
	text_gizmo_->SetRect(rect);
	text_gizmo_->SetHtml(row[kTextInput].toString());
}

Qt::Alignment TextGeneratorV3::GetQtAlignmentFromOurs(VerticalAlignment v)
{
	switch (v) {
	case kVAlignTop:
		return Qt::AlignTop;
	case kVAlignMiddle:
		return Qt::AlignVCenter;
	case kVAlignBottom:
		return Qt::AlignBottom;
	}
	return Qt::Alignment();
}

TextGeneratorV3::VerticalAlignment
TextGeneratorV3::GetOurAlignmentFromQts(Qt::Alignment v)
{
	switch (v) {
	case Qt::AlignTop:
		return kVAlignTop;
	case Qt::AlignVCenter:
		return kVAlignMiddle;
	case Qt::AlignBottom:
		return kVAlignBottom;
	}

	return kVAlignTop;
}

QString TextGeneratorV3::FormatString(const QString &input,
									  const QStringList &args)
{
	QString output;
	output.reserve(input.size());

	for (int i = 0; i < input.size(); i++) {
		const QChar &this_char = input.at(i);

		if (i < input.size() - 1 && this_char == '%') {
			const QChar &next_char = input.at(i + 1);
			if (next_char == '%') {
				// Double percent, append a single percent
				output.append('%');
				i++;
			} else if (next_char.isDigit()) {
				// Find length of number
				QString num;
				i++;
				while (i < input.size() && input.at(i).isDigit()) {
					num.append(input.at(i));
					i++;
				}
				i--;
				int index = num.toInt() - 1;
				if (index >= 0 && index < args.size()) {
					output.append(args.at(index));
				}
			} else {
				output.append(this_char);
			}
		} else {
			output.append(this_char);
		}
	}

	return output;
}

void TextGeneratorV3::InputValueChangedEvent(const QString &input, int element)
{
	if (input == kVerticalAlignmentInput && !dont_emit_valign_) {
		text_gizmo_->SetVerticalAlignment(
			GetQtAlignmentFromOurs(GetVerticalAlignment()));
	}

	super::InputValueChangedEvent(input, element);
}

void TextGeneratorV3::GizmoActivated()
{
	SetStandardValue(kUseArgsInput, false);
	connect(text_gizmo_, &TextGizmo::VerticalAlignmentChanged, this,
			&TextGeneratorV3::SetVerticalAlignmentUndoable);
	dont_emit_valign_ = true;
}

void TextGeneratorV3::GizmoDeactivated()
{
	SetStandardValue(kUseArgsInput, true);
	disconnect(text_gizmo_, &TextGizmo::VerticalAlignmentChanged, this,
			   &TextGeneratorV3::SetVerticalAlignmentUndoable);
	dont_emit_valign_ = true;
}

void TextGeneratorV3::SetVerticalAlignmentUndoable(Qt::Alignment a)
{
	Core::instance()->undo_stack()->push(
		new NodeParamSetStandardValueCommand(NodeInput(this,
													   kVerticalAlignmentInput),
											 GetOurAlignmentFromQts(a)),
		tr("Set Text Vertical Alignment"));
}

}