/*
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 "calls/calls_signal_bars.h"

#include "calls/calls_call.h"
#include "styles/style_calls.h"

namespace Calls {

SignalBars::SignalBars(
	QWidget *parent,
	not_null<Call*> call,
	const style::CallSignalBars &st,
	Fn<void()> displayedChangedCallback)
: RpWidget(parent)
, _st(st)
, _count(Call::kSignalBarStarting)
, _displayedChangedCallback(std::move(displayedChangedCallback)) {
	resize(
		_st.width + (_st.width + _st.skip) * (Call::kSignalBarCount - 1),
		_st.width * Call::kSignalBarCount);
	call->signalBarCountValue(
	) | rpl::start_with_next([=](int count) {
		changed(count);
	}, lifetime());
}

bool SignalBars::isDisplayed() const {
	return (_count >= 0);
}

void SignalBars::paintEvent(QPaintEvent *e) {
	if (!isDisplayed()) {
		return;
	}

	Painter p(this);

	PainterHighQualityEnabler hq(p);
	p.setPen(Qt::NoPen);
	p.setBrush(_st.color);
	for (auto i = 0; i < Call::kSignalBarCount; ++i) {
		p.setOpacity((i < _count) ? 1. : _st.inactiveOpacity);
		const auto barHeight = (i + 1) * _st.width;
		const auto barLeft = i * (_st.width + _st.skip);
		const auto barTop = height() - barHeight;
		p.drawRoundedRect(
			barLeft,
			barTop,
			_st.width,
			barHeight,
			_st.radius,
			_st.radius);
	}
	p.setOpacity(1.);
}

void SignalBars::changed(int count) {
	if (_count == Call::kSignalBarFinished) {
		return;
	}
	if (_count != count) {
		const auto wasDisplayed = isDisplayed();
		_count = count;
		if (isDisplayed() != wasDisplayed && _displayedChangedCallback) {
			_displayedChangedCallback();
		}
		update();
	}
}

} // namespace Calls