#include "gui/pages/seasons.h"

#include "core/anime_db.h"
#include "core/anime_season_db.h"
#include "core/strings.h"
#include "gui/widgets/anime_button.h"
#include "gui/translate/anime.h"

#include <QDate>
#include <QFrame>
#include <QListWidget>
#include <QListWidgetItem>
#include <QMenu>
#include <QToolBar>
#include <QToolButton>
#include <QVBoxLayout>

static constexpr Date::Year GetClosestDecade(Date::Year year) {
	return year - (year % 10);
}

void SeasonsPage::SetSeason(Anime::SeriesSeason season, Date::Year year) {
	if (!buttons || !season_button)
		return;

	buttons->clear();

	for (const auto& id : Anime::Season::GetAllAnimeForSeason(season, year)) {
		QListWidgetItem* item = new QListWidgetItem;
		AnimeButton* button = new AnimeButton(this);
		button->SetAnime(Anime::db.items[id]);
		item->setSizeHint(button->sizeHint());
		buttons->addItem(item);
		buttons->setItemWidget(item, button);
	}

	season_button->setText(Strings::ToQString(Translate::ToLocalString(season)) + " " + QString::number(year));
}

SeasonsPage::SeasonsPage(QWidget* parent) : QWidget(parent) {
	QVBoxLayout* full_layout = new QVBoxLayout(this);

	{
		/* Toolbar */
		QToolBar* toolbar = new QToolBar(this);
		toolbar->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
		toolbar->setIconSize(QSize(16, 16));
		toolbar->setMovable(false);

		{
			/* hard-coded this value */
			static constexpr Date::Year last_year = 1960;

			auto create_year_menu = [this](QWidget* parent, QMenu* parent_menu, Date::Year year){
				const QString year_s = QString::number(year);

				QMenu* menu = new QMenu(year_s, parent);
				for (const auto& season : Anime::SeriesSeasons) {
					QAction* action = menu->addAction(Strings::ToQString(Translate::ToLocalString(season)) + " " + year_s);
					connect(action, &QAction::triggered, this, [this, season, year]{
						SetSeason(season, year);
					});
				}
				parent_menu->addMenu(menu);
			};

			auto create_decade_menu = [create_year_menu](QWidget* parent, QMenu* parent_menu, Date::Year decade) {
				QMenu* menu = new QMenu(QString::number(decade) + "s", parent);
				for (int i = 9; i >= 0; i--)
					create_year_menu(parent, menu, decade + i);
				parent_menu->addMenu(menu);
			};

			/* we'll be extinct by the time this code breaks, so I guess it's fine :) */
			const Date::Year year = static_cast<Date::Year>(QDate::currentDate().year());
			const Date::Year year_before_collapse = GetClosestDecade(year) - 10;
			season_button = new QToolButton(toolbar);
			QMenu* full_season_menu = new QMenu(season_button);

			for (Date::Year c = year; c >= year_before_collapse; c--)
				create_year_menu(season_button, full_season_menu, c);

			full_season_menu->addSeparator();

			for (Date::Year c = year_before_collapse - 10; c >= last_year; c -= 10)
				create_decade_menu(season_button, full_season_menu, c);

			season_button->setMenu(full_season_menu);
			season_button->setPopupMode(QToolButton::InstantPopup);

			toolbar->addWidget(season_button);
		}

		toolbar->addSeparator();

		{ toolbar->addAction(QIcon(":/icons/16x16/arrow-circle-315.png"), tr("Refresh data")); }

		toolbar->addSeparator();

		{
			QToolButton* button = new QToolButton(toolbar);

			{
				/* links */
				QMenu* menu = new QMenu(button);
				menu->addAction("Airing status");
				menu->addAction("List status");
				menu->addAction("Type");
				button->setMenu(menu);
			}

			button->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
			button->setIcon(QIcon(":/icons/16x16/category.png"));
			button->setText("Group by:");
			button->setPopupMode(QToolButton::InstantPopup);
			toolbar->addWidget(button);
		}

		{
			QToolButton* button = new QToolButton(toolbar);

			{
				/* links */
				QMenu* menu = new QMenu(button);
				menu->addAction("Airing date");
				menu->addAction("Episodes");
				menu->addAction("Popularity");
				menu->addAction("Score");
				menu->addAction("Title");
				button->setMenu(menu);
			}

			button->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
			button->setIcon(QIcon(":/icons/16x16/sort-quantity-descending.png"));
			button->setText("Sort by:");
			button->setPopupMode(QToolButton::InstantPopup);
			toolbar->addWidget(button);
		}

		{
			QToolButton* button = new QToolButton(toolbar);

			{
				/* links */
				QMenu* menu = new QMenu(button);
				menu->addAction("Images");
				menu->addAction("Details");
				button->setMenu(menu);
			}

			button->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
			button->setIcon(QIcon(":/icons/16x16/ui-scroll-pane-detail.png"));
			button->setText("View:");
			button->setPopupMode(QToolButton::InstantPopup);
			toolbar->addWidget(button);
		}

		full_layout->addWidget(toolbar);
	}

	{
		QFrame* line = new QFrame(this);
		line->setFrameShape(QFrame::HLine);
		line->setFrameShadow(QFrame::Sunken);
		line->setLineWidth(1);
		full_layout->addWidget(line);
	}

	{
		buttons = new QListWidget(this);
		buttons->setFlow(QListView::LeftToRight);
		buttons->setWrapping(true);
		buttons->setContentsMargins(4, 4, 4, 4);
		buttons->setSpacing(2);
		buttons->setResizeMode(QListView::Adjust);

		full_layout->addWidget(buttons);
	}

	/* Do NOT move this up in this function, buttons HAS to be initialized */
	SetSeason(Anime::SeriesSeason::Summer, 2011);
}