/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.

For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#include "statistics/view/chart_horizontal_lines_view.h"

#include "data/data_statistics.h"
#include "statistics/statistics_common.h"
#include "styles/style_statistics.h"

namespace Statistic {

ChartHorizontalLinesView::ChartHorizontalLinesView() = default;

void ChartHorizontalLinesView::setChartData(
		const Data::StatisticalChart &chartData,
		ChartViewType type) {
	_isDouble = (type == ChartViewType::DoubleLinear);
	if (_isDouble && (chartData.lines.size() == 2)) {
		_leftColor = chartData.lines.front().color;
		_rightColor = chartData.lines.back().color;
	}
}

void ChartHorizontalLinesView::paintHorizontalLines(
		QPainter &p,
		const QRect &r) {
	for (auto &horizontalLine : _horizontalLines) {
		const auto alpha = p.opacity();
		p.setOpacity(horizontalLine.alpha);
		for (const auto &line : horizontalLine.lines) {
			const auto lineRect = QRect(
				0,
				r.y() + r.height() * line.relativeValue,
				r.x() + r.width(),
				st::lineWidth);
			p.fillRect(lineRect, st::windowSubTextFg);
		}
		p.setOpacity(alpha);
	}
}

void ChartHorizontalLinesView::paintCaptionsToHorizontalLines(
		QPainter &p,
		const QRect &r) {
	for (auto &horizontalLine : _horizontalLines) {
		const auto alpha = p.opacity();
		p.setOpacity(horizontalLine.alpha);
		p.setFont(st::statisticsDetailsBottomCaptionStyle.font);
		p.setPen(st::windowSubTextFg);
		const auto offset = r.y()
			- st::statisticsChartHorizontalLineCaptionSkip;
		for (const auto &line : horizontalLine.lines) {
			const auto y = offset + r.height() * line.relativeValue;
			p.drawText(0, y, line.caption);
		}
		p.setOpacity(alpha);
	}
}

void ChartHorizontalLinesView::computeRelative(
		int newMaxHeight,
		int newMinHeight) {
	for (auto &horizontalLine : _horizontalLines) {
		horizontalLine.computeRelative(newMaxHeight, newMinHeight);
	}
}

void ChartHorizontalLinesView::setAlpha(float64 value) {
	for (auto &horizontalLine : _horizontalLines) {
		horizontalLine.alpha = horizontalLine.fixedAlpha * (1. - value);
	}
	_horizontalLines.back().alpha = value;
	if (value == 1.) {
		while (_horizontalLines.size() > 1) {
			const auto startIt = begin(_horizontalLines);
			if (!startIt->alpha) {
				_horizontalLines.erase(startIt);
			} else {
				break;
			}
		}
	}
}

void ChartHorizontalLinesView::add(Limits newHeight, bool animated) {
	const auto newLinesData = ChartHorizontalLinesData(
		newHeight.max,
		newHeight.min,
		true);
	if (!animated) {
		_horizontalLines.clear();
	}
	for (auto &horizontalLine : _horizontalLines) {
		horizontalLine.fixedAlpha = horizontalLine.alpha;
	}
	_horizontalLines.push_back(newLinesData);
	if (!animated) {
		_horizontalLines.back().alpha = 1.;
	}
}

} // namespace Statistic