/*
 * Copyright (c) 2020, the SerenityOS developers.
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include "ChessWidget.h"
#include <LibCore/ConfigFile.h>
#include <LibCore/DirIterator.h>
#include <LibGUI/ActionGroup.h>
#include <LibGUI/Application.h>
#include <LibGUI/Clipboard.h>
#include <LibGUI/FilePicker.h>
#include <LibGUI/Icon.h>
#include <LibGUI/Menu.h>
#include <LibGUI/Menubar.h>
#include <LibGUI/MessageBox.h>
#include <LibGUI/Window.h>
#include <unistd.h>

int main(int argc, char** argv)
{
    auto app = GUI::Application::construct(argc, argv);
    auto app_icon = GUI::Icon::default_icon("app-chess");

    auto window = GUI::Window::construct();
    auto& widget = window->set_main_widget<ChessWidget>();

    RefPtr<Core::ConfigFile> config = Core::ConfigFile::get_for_app("Chess");

    if (pledge("stdio rpath wpath cpath recvfd sendfd thread proc exec", nullptr) < 0) {
        perror("pledge");
        return 1;
    }

    if (unveil("/res", "r") < 0) {
        perror("unveil");
        return 1;
    }

    if (unveil(config->filename().characters(), "crw") < 0) {
        perror("unveil");
        return 1;
    }

    if (unveil("/bin/ChessEngine", "x") < 0) {
        perror("unveil");
        return 1;
    }

    if (unveil("/etc/passwd", "r") < 0) {
        perror("unveil");
        return 1;
    }

    if (unveil(Core::StandardPaths::home_directory().characters(), "wcbr") < 0) {
        perror("unveil");
        return 1;
    }

    if (unveil(nullptr, nullptr) < 0) {
        perror("unveil");
        return 1;
    }

    auto size = config->read_num_entry("Display", "size", 512);
    window->set_title("Chess");
    window->set_base_size({ 4, 4 });
    window->set_size_increment({ 8, 8 });
    window->resize(size - 4, size - 4);

    window->set_icon(app_icon.bitmap_for_size(16));

    widget.set_piece_set(config->read_entry("Style", "PieceSet", "stelar7"));
    widget.set_board_theme(config->read_entry("Style", "BoardTheme", "Beige"));
    widget.set_coordinates(config->read_bool_entry("Style", "Coordinates", true));
    widget.set_show_available_moves(config->read_bool_entry("Style", "ShowAvailableMoves", true));

    auto menubar = GUI::Menubar::construct();
    auto& game_menu = menubar->add_menu("&Game");

    game_menu.add_action(GUI::Action::create("&Resign", { Mod_None, Key_F3 }, [&](auto&) {
        widget.resign();
    }));
    game_menu.add_action(GUI::Action::create("&Flip Board", { Mod_Ctrl, Key_F }, [&](auto&) {
        widget.flip_board();
    }));
    game_menu.add_separator();

    game_menu.add_action(GUI::Action::create("&Import PGN...", { Mod_Ctrl, Key_O }, [&](auto&) {
        Optional<String> import_path = GUI::FilePicker::get_open_filepath(window);

        if (!import_path.has_value())
            return;

        if (!widget.import_pgn(import_path.value())) {
            GUI::MessageBox::show(window, "Unable to import game.\n", "Error", GUI::MessageBox::Type::Error);
            return;
        }

        dbgln("Imported PGN file from {}", import_path.value());
    }));
    game_menu.add_action(GUI::Action::create("&Export PGN...", { Mod_Ctrl, Key_S }, [&](auto&) {
        Optional<String> export_path = GUI::FilePicker::get_save_filepath(window, "Untitled", "pgn");

        if (!export_path.has_value())
            return;

        if (!widget.export_pgn(export_path.value())) {
            GUI::MessageBox::show(window, "Unable to export game.\n", "Error", GUI::MessageBox::Type::Error);
            return;
        }

        dbgln("Exported PGN file to {}", export_path.value());
    }));
    game_menu.add_action(GUI::Action::create("&Copy FEN", { Mod_Ctrl, Key_C }, [&](auto&) {
        GUI::Clipboard::the().set_data(widget.get_fen().bytes());
        GUI::MessageBox::show(window, "Board state copied to clipboard as FEN.", "Copy FEN", GUI::MessageBox::Type::Information);
    }));
    game_menu.add_separator();

    game_menu.add_action(GUI::Action::create("&New Game", { Mod_None, Key_F2 }, [&](auto&) {
        if (widget.board().game_result() == Chess::Board::Result::NotFinished) {
            if (widget.resign() < 0)
                return;
        }
        widget.reset();
    }));
    game_menu.add_separator();
    game_menu.add_action(GUI::CommonActions::make_quit_action([](auto&) {
        GUI::Application::the()->quit();
    }));

    auto& style_menu = menubar->add_menu("&Style");
    GUI::ActionGroup piece_set_action_group;
    piece_set_action_group.set_exclusive(true);
    auto& piece_set_menu = style_menu.add_submenu("&Piece Set");
    piece_set_menu.set_icon(app_icon.bitmap_for_size(16));

    Core::DirIterator di("/res/icons/chess/sets/", Core::DirIterator::SkipParentAndBaseDir);
    while (di.has_next()) {
        auto set = di.next_path();
        auto action = GUI::Action::create_checkable(set, [&](auto& action) {
            widget.set_piece_set(action.text());
            widget.update();
            config->write_entry("Style", "PieceSet", action.text());
            config->sync();
        });

        piece_set_action_group.add_action(*action);
        if (widget.piece_set() == set)
            action->set_checked(true);
        piece_set_menu.add_action(*action);
    }

    GUI::ActionGroup board_theme_action_group;
    board_theme_action_group.set_exclusive(true);
    auto& board_theme_menu = style_menu.add_submenu("Board Theme");
    board_theme_menu.set_icon(Gfx::Bitmap::load_from_file("/res/icons/chess/mini-board.png"));

    for (auto& theme : Vector({ "Beige", "Green", "Blue" })) {
        auto action = GUI::Action::create_checkable(theme, [&](auto& action) {
            widget.set_board_theme(action.text());
            widget.update();
            config->write_entry("Style", "BoardTheme", action.text());
            config->sync();
        });
        board_theme_action_group.add_action(*action);
        if (widget.board_theme().name == theme)
            action->set_checked(true);
        board_theme_menu.add_action(*action);
    }

    auto coordinates_action = GUI::Action::create_checkable("Coordinates", [&](auto& action) {
        widget.set_coordinates(action.is_checked());
        widget.update();
        config->write_bool_entry("Style", "Coordinates", action.is_checked());
        config->sync();
    });
    coordinates_action->set_checked(widget.coordinates());
    style_menu.add_action(coordinates_action);

    auto show_available_moves_action = GUI::Action::create_checkable("Show Available Moves", [&](auto& action) {
        widget.set_show_available_moves(action.is_checked());
        widget.update();
        config->write_bool_entry("Style", "ShowAvailableMoves", action.is_checked());
        config->sync();
    });
    show_available_moves_action->set_checked(widget.show_available_moves());
    style_menu.add_action(show_available_moves_action);

    auto& engine_menu = menubar->add_menu("&Engine");

    GUI::ActionGroup engines_action_group;
    engines_action_group.set_exclusive(true);
    auto& engine_submenu = engine_menu.add_submenu("&Engine");
    for (auto& engine : Vector({ "Human", "ChessEngine" })) {
        auto action = GUI::Action::create_checkable(engine, [&](auto& action) {
            if (action.text() == "Human") {
                widget.set_engine(nullptr);
            } else {
                widget.set_engine(Engine::construct(action.text()));
                widget.input_engine_move();
            }
        });
        engines_action_group.add_action(*action);
        if (engine == String("Human"))
            action->set_checked(true);

        engine_submenu.add_action(*action);
    }

    auto& help_menu = menubar->add_menu("&Help");
    help_menu.add_action(GUI::CommonActions::make_about_action("Chess", app_icon, window));

    window->set_menubar(move(menubar));

    window->show();
    widget.reset();

    return app->exec();
}