/*
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/statistics_box.h"

#include "api/api_statistics.h"
#include "data/data_peer.h"
#include "lang/lang_keys.h"
#include "lottie/lottie_icon.h"
#include "main/main_session.h"
#include "settings/settings_common.h"
#include "statistics/chart_widget.h"
#include "statistics/statistics_common.h"
#include "ui/layers/generic_box.h"
#include "ui/rect.h"
#include "ui/toast/toast.h"
#include "ui/wrap/slide_wrap.h"
#include "styles/style_boxes.h"
#include "styles/style_settings.h"
#include "styles/style_statistics.h"

namespace {

struct Descriptor final {
	not_null<PeerData*> peer;
	not_null<Api::Statistics*> api;
	not_null<QWidget*> toastParent;
};

void ProcessZoom(
		const Descriptor &d,
		not_null<Statistic::ChartWidget*> widget,
		const QString &zoomToken,
		Statistic::ChartViewType type) {
	if (zoomToken.isEmpty()) {
		return;
	}
	widget->zoomRequests(
	) | rpl::start_with_next([=](float64 x) {
		d.api->requestZoom(
			d.peer,
			zoomToken,
			x
		) | rpl::start_with_next_error_done([=](
				const Data::StatisticalGraph &graph) {
			if (graph.chart) {
				widget->setZoomedChartData(graph.chart, x, type);
			} else if (!graph.error.isEmpty()) {
				Ui::Toast::Show(d.toastParent, graph.error);
			}
		}, [=](const QString &error) {
		}, [=] {
		}, widget->lifetime());
	}, widget->lifetime());
}

void ProcessChart(
		const Descriptor &d,
		not_null<Statistic::ChartWidget*> widget,
		const Data::StatisticalGraph &graphData,
		rpl::producer<QString> &&title,
		Statistic::ChartViewType type) {
	if (graphData.chart) {
		widget->setChartData(graphData.chart, type);
		ProcessZoom(d, widget, graphData.zoomToken, type);
		widget->setTitle(std::move(title));
	} else if (!graphData.zoomToken.isEmpty()) {
		d.api->requestZoom(
			d.peer,
			graphData.zoomToken,
			0
		) | rpl::start_with_next_error_done([=](
				const Data::StatisticalGraph &graph) {
			if (graph.chart) {
				widget->setChartData(graph.chart, type);
				ProcessZoom(d, widget, graph.zoomToken, type);
				widget->setTitle(rpl::duplicate(title));
			} else if (!graph.error.isEmpty()) {
				Ui::Toast::Show(d.toastParent, graph.error);
			}
		}, [=](const QString &error) {
		}, [=] {
		}, widget->lifetime());
	}
}

void FillChannelStatistic(
		not_null<Ui::GenericBox*> box,
		const Descriptor &descriptor,
		const Data::ChannelStatistics &stats) {
	using Type = Statistic::ChartViewType;
	const auto &padding = st::statisticsChartEntryPadding;
	const auto addSkip = [&] {
		Settings::AddSkip(box->verticalLayout(), padding.bottom());
		Settings::AddDivider(box->verticalLayout());
		Settings::AddSkip(box->verticalLayout(), padding.top());
	};
	Settings::AddSkip(box->verticalLayout(), padding.top());
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.memberCountGraph,
		tr::lng_chart_title_member_count(),
		Type::Linear);
	addSkip();
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.joinGraph,
		tr::lng_chart_title_join(),
		Type::Linear);
	addSkip();
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.muteGraph,
		tr::lng_chart_title_mute(),
		Type::Linear);
	addSkip();
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.viewCountByHourGraph,
		tr::lng_chart_title_view_count_by_hour(),
		Type::Linear);
	addSkip();
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.viewCountBySourceGraph,
		tr::lng_chart_title_view_count_by_source(),
		Type::Stack);
	addSkip();
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.joinBySourceGraph,
		tr::lng_chart_title_join_by_source(),
		Type::Stack);
	addSkip();
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.languageGraph,
		tr::lng_chart_title_language(),
		Type::StackLinear);
	addSkip();
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.messageInteractionGraph,
		tr::lng_chart_title_message_interaction(),
		Type::DoubleLinear);
	addSkip();
	ProcessChart(
		descriptor,
		box->addRow(object_ptr<Statistic::ChartWidget>(box)),
		stats.instantViewInteractionGraph,
		tr::lng_chart_title_instant_view_interaction(),
		Type::DoubleLinear);
	addSkip();

	box->verticalLayout()->resizeToWidth(box->width());
	box->showChildren();
}

void FillLoading(
		not_null<Ui::GenericBox*> box,
		rpl::producer<bool> toggleOn) {
	const auto emptyWrap = box->verticalLayout()->add(
		object_ptr<Ui::SlideWrap<Ui::VerticalLayout>>(
			box->verticalLayout(),
			object_ptr<Ui::VerticalLayout>(box->verticalLayout())));
	emptyWrap->toggleOn(std::move(toggleOn), anim::type::instant);

	const auto content = emptyWrap->entity();
	auto icon = Settings::CreateLottieIcon(
		content,
		{ .name = u"stats"_q, .sizeOverride = Size(st::changePhoneIconSize) },
		st::settingsBlockedListIconPadding);
	content->add(std::move(icon.widget));

	box->setShowFinishedCallback([animate = std::move(icon.animate)] {
		animate(anim::repeat::loop);
	});

	content->add(
		object_ptr<Ui::CenterWrap<>>(
			content,
			object_ptr<Ui::FlatLabel>(
				content,
				tr::lng_stats_loading(),
				st::changePhoneTitle)),
		st::changePhoneTitlePadding + st::boxRowPadding);

	content->add(
		object_ptr<Ui::CenterWrap<>>(
			content,
			object_ptr<Ui::FlatLabel>(
				content,
				tr::lng_stats_loading_subtext(),
				st::statisticsLoadingSubtext)),
		st::changePhoneDescriptionPadding + st::boxRowPadding);

	Settings::AddSkip(content, st::settingsBlockedListIconPadding.top());
}

} // namespace

void StatisticsBox(not_null<Ui::GenericBox*> box, not_null<PeerData*> peer) {
	box->setTitle(tr::lng_stats_title());
	const auto loaded = box->lifetime().make_state<rpl::event_stream<bool>>();
	FillLoading(
		box,
		loaded->events_starting_with(false) | rpl::map(!rpl::mappers::_1));

	const auto descriptor = Descriptor{
		peer,
		box->lifetime().make_state<Api::Statistics>(&peer->session().api()),
		box->uiShow()->toastParent(),
	};

	descriptor.api->request(
		descriptor.peer
	) | rpl::start_with_done([=] {
		const auto stats = descriptor.api->channelStats();
		if (!stats) {
			return;
		}
		FillChannelStatistic(box, descriptor, stats);
		loaded->fire(true);
	}, box->lifetime());
}