/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org

Telegram Desktop 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.

It 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.

In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.

Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#include "info/media/info_media_inner_widget.h"

#include <rpl/flatten_latest.h>
#include "boxes/abstract_box.h"
#include "info/media/info_media_list_widget.h"
#include "info/media/info_media_buttons.h"
#include "info/media/info_media_empty_widget.h"
#include "info/profile/info_profile_button.h"
#include "info/profile/info_profile_icon.h"
#include "info/info_controller.h"
#include "ui/widgets/discrete_sliders.h"
#include "ui/widgets/shadow.h"
#include "ui/wrap/vertical_layout.h"
#include "ui/search_field_controller.h"
#include "styles/style_info.h"
#include "lang/lang_keys.h"

namespace Info {
namespace Media {

InnerWidget::InnerWidget(
	QWidget *parent,
	not_null<Controller*> controller)
: RpWidget(parent)
, _controller(controller)
, _empty(this) {
	_empty->heightValue()
		| rpl::start_with_next(
			[this] { refreshHeight(); },
			_empty->lifetime());
	_list = setupList();
	// Allows showing additional shared media links and tabs.
	// Was done for top level tabs support.
	//
	//setupOtherTypes();
}

// Allows showing additional shared media links and tabs.
// Was done for top level tabs support.
//
//void InnerWidget::setupOtherTypes() {
//	_controller->wrapValue()
//		| rpl::start_with_next([this](Wrap value) {
//			if (value == Wrap::Side
//				&& !_controller->hasStackHistory()
//				&& TypeToTabIndex(type())) {
//				createOtherTypes();
//			} else {
//				_otherTabs = nullptr;
//				_otherTypes.destroy();
//				refreshHeight();
//			}
//		}, lifetime());
//	rpl::combine(
//		_controller->wrapValue(),
//		_controller->searchEnabledByContent())
//		| rpl::start_with_next([this](Wrap wrap, bool enabled) {
//			_searchEnabled = enabled;
//			refreshSearchField();
//		}, lifetime());
//}
//
//void InnerWidget::createOtherTypes() {
//	_otherTabsShadow.create(this);
//	_otherTabsShadow->show();
//
//	_otherTabs = nullptr;
//	_otherTypes.create(this);
//	_otherTypes->show();
//
//	createTypeButtons();
//	_otherTypes->add(object_ptr<BoxContentDivider>(_otherTypes));
//	createTabs();
//
//	_otherTypes->heightValue()
//		| rpl::start_with_next(
//			[this] { refreshHeight(); },
//			_otherTypes->lifetime());
//}
//
//void InnerWidget::createTypeButtons() {
//	auto wrap = _otherTypes->add(object_ptr<Ui::SlideWrap<Ui::VerticalLayout>>(
//		_otherTypes,
//		object_ptr<Ui::VerticalLayout>(_otherTypes)));
//	auto content = wrap->entity();
//	content->add(object_ptr<Ui::FixedHeightWidget>(
//		content,
//		st::infoProfileSkip));
//
//	auto tracker = Ui::MultiSlideTracker();
//	auto addMediaButton = [&](
//			Type type,
//			const style::icon &icon) {
//		auto result = AddButton(
//			content,
//			_controller->window(),
//			_controller->peer(),
//			_controller->migrated(),
//			type,
//			tracker);
//		object_ptr<Profile::FloatingIcon>(
//			result,
//			icon,
//			st::infoSharedMediaButtonIconPosition);
//	};
//	auto addCommonGroupsButton = [&](
//			not_null<UserData*> user,
//			const style::icon &icon) {
//		auto result = AddCommonGroupsButton(
//			content,
//			_controller->window(),
//			user,
//			tracker);
//		object_ptr<Profile::FloatingIcon>(
//			result,
//			icon,
//			st::infoSharedMediaButtonIconPosition);
//	};
//
//	addMediaButton(Type::MusicFile, st::infoIconMediaAudio);
//	addMediaButton(Type::Link, st::infoIconMediaLink);
//	if (auto user = _controller->peer()->asUser()) {
//		addCommonGroupsButton(user, st::infoIconMediaGroup);
//	}
//	addMediaButton(Type::VoiceFile, st::infoIconMediaVoice);
////	addMediaButton(Type::RoundFile, st::infoIconMediaRound);
//
//	content->add(object_ptr<Ui::FixedHeightWidget>(
//		content,
//		st::infoProfileSkip));
//	wrap->toggleOn(tracker.atLeastOneShownValue());
//	wrap->finishAnimating();
//}
//
//void InnerWidget::createTabs() {
//	_otherTabs = _otherTypes->add(object_ptr<Ui::SettingsSlider>(
//		this,
//		st::infoTabs));
//	auto sections = QStringList();
//	sections.push_back(lang(lng_media_type_photos).toUpper());
//	sections.push_back(lang(lng_media_type_videos).toUpper());
//	sections.push_back(lang(lng_media_type_files).toUpper());
//	_otherTabs->setSections(sections);
//	_otherTabs->setActiveSection(*TypeToTabIndex(type()));
//	_otherTabs->finishAnimating();
//
//	_otherTabs->sectionActivated()
//		| rpl::map([](int index) { return TabIndexToType(index); })
//		| rpl::start_with_next(
//			[this](Type newType) {
//				if (type() != newType) {
//					switchToTab(Memento(
//						_controller->peerId(),
//						_controller->migratedPeerId(),
//						newType));
//				}
//			},
//			_otherTabs->lifetime());
//}

Type InnerWidget::type() const {
	return _controller->section().mediaType();
}

void InnerWidget::visibleTopBottomUpdated(
		int visibleTop,
		int visibleBottom) {
	setChildVisibleTopBottom(_list, visibleTop, visibleBottom);
}

bool InnerWidget::showInternal(not_null<Memento*> memento) {
	if (!_controller->validateMementoPeer(memento)) {
		return false;
	}
	auto mementoType = memento->section().mediaType();
	if (mementoType == type()) {
		restoreState(memento);
		return true;

	// Allows showing additional shared media links and tabs.
	// Was done for top level tabs support.
	//
	//} else if (_otherTypes) {
	//	if (TypeToTabIndex(mementoType)) {
	//		switchToTab(std::move(*memento));
	//		return true;
	//	}

	}
	return false;
}

// Allows showing additional shared media links and tabs.
// Was done for top level tabs support.
//
//void InnerWidget::switchToTab(Memento &&memento) {
//	// Save state of the tab before setSection() call.
//	_controller->setSection(&memento);
//	_list = setupList();
//	restoreState(&memento);
//	_list->show();
//	_list->resizeToWidth(width());
//	refreshHeight();
//	if (_otherTypes) {
//		_otherTabsShadow->raise();
//		_otherTypes->raise();
//		_otherTabs->setActiveSection(*TypeToTabIndex(type()));
//	}
//}
//
//void InnerWidget::refreshSearchField() {
//	auto search = _controller->searchFieldController();
//	if (search && _otherTabs && _searchEnabled) {
//		_searchField = search->createRowView(
//			this,
//			st::infoMediaSearch);
//		_searchField->resizeToWidth(width());
//		_searchField->show();
//		search->queryChanges()
//			| rpl::start_with_next([this] {
//				scrollToSearchField();
//			}, _searchField->lifetime());
//	} else {
//		_searchField = nullptr;
//	}
//}
//
//void InnerWidget::scrollToSearchField() {
//	Expects(_searchField != nullptr);
//
//	auto top = _searchField->y();
//	auto bottom = top + _searchField->height();
//	_scrollToRequests.fire({ top, bottom });
//}

object_ptr<ListWidget> InnerWidget::setupList() {
	auto result = object_ptr<ListWidget>(
		this,
		_controller);
	result->heightValue()
		| rpl::start_with_next(
			[this] { refreshHeight(); },
			result->lifetime());
	using namespace rpl::mappers;
	result->scrollToRequests()
		| rpl::map([widget = result.data()](int to) {
			return Ui::ScrollToRequest {
				widget->y() + to,
				-1
			};
		})
		| rpl::start_to_stream(
			_scrollToRequests,
			result->lifetime());
	_selectedLists.fire(result->selectedListValue());
	_listTops.fire(result->topValue());
	_empty->setType(_controller->section().mediaType());
	_controller->mediaSourceQueryValue()
		| rpl::start_with_next([this](const QString &query) {
			_empty->setSearchQuery(query);
		}, result->lifetime());
	return result;
}

void InnerWidget::saveState(not_null<Memento*> memento) {
	_list->saveState(memento);
}

void InnerWidget::restoreState(not_null<Memento*> memento) {
	_list->restoreState(memento);
}

rpl::producer<SelectedItems> InnerWidget::selectedListValue() const {
	return _selectedLists.events_starting_with(_list->selectedListValue())
		| rpl::flatten_latest();
}

void InnerWidget::cancelSelection() {
	_list->cancelSelection();
}

InnerWidget::~InnerWidget() = default;

int InnerWidget::resizeGetHeight(int newWidth) {
	_inResize = true;
	auto guard = gsl::finally([this] { _inResize = false; });

	//if (_otherTypes) {
	//	_otherTypes->resizeToWidth(newWidth);
	//	_otherTabsShadow->resizeToWidth(newWidth);
	//}
	//if (_searchField) {
	//	_searchField->resizeToWidth(newWidth);
	//}
	_list->resizeToWidth(newWidth);
	_empty->resizeToWidth(newWidth);
	return recountHeight();
}

void InnerWidget::refreshHeight() {
	if (_inResize) {
		return;
	}
	resize(width(), recountHeight());
}

int InnerWidget::recountHeight() {
	auto top = 0;
	//if (_otherTypes) {
	//	_otherTypes->moveToLeft(0, top);
	//	top += _otherTypes->heightNoMargins() - st::lineWidth;
	//	_otherTabsShadow->moveToLeft(0, top);
	//}
	//if (_searchField) {
	//	_searchField->moveToLeft(0, top);
	//	top += _searchField->heightNoMargins() - st::lineWidth;
	//}
	auto listHeight = 0;
	if (_list) {
		_list->moveToLeft(0, top);
		listHeight = _list->heightNoMargins();
		top += listHeight;
	}
	if (listHeight > 0) {
		_empty->hide();
	} else {
		_empty->show();
		_empty->moveToLeft(0, top);
		top += _empty->heightNoMargins();
	}
	return top;
}

void InnerWidget::setScrollHeightValue(rpl::producer<int> value) {
	using namespace rpl::mappers;
	_empty->setFullHeight(rpl::combine(
		std::move(value),
		_listTops.events_starting_with(_list->topValue())
			| rpl::flatten_latest(),
		_1 - _2));
}

rpl::producer<Ui::ScrollToRequest> InnerWidget::scrollToRequests() const {
	return _scrollToRequests.events();
}

} // namespace Media
} // namespace Info