use crate::prelude::*;

use self::tutorial::TutorialState;

pub(crate) struct MenuPlugin;

impl Plugin for MenuPlugin {
    fn build(&self, app: &mut App) {
        app.add_state::<MenuState>()
            // Initialize menus
            .add_systems(
                OnExit(GameState::Loading),
                (init_play_menu, init_tutorial_menu, init_endgame_menu),
            )
            // Manage visible/hidden states
            .add_systems(
                Update,
                manage_state_entities::<MenuState>().run_if(state_changed::<MenuState>()),
            )
            .add_systems(
                Update,
                set_menu_state.run_if(just_pressed(KeyCode::Escape))
            );
    }
}

#[derive(Debug, States, Hash, Default, PartialEq, Eq, Clone, Component)]
enum MenuState {
    #[default]
    None,
    Play,
    Tutorial,
    Endgame,
}

#[derive(Debug, Component)]
enum ButtonAction {
    GameState(GameState),
    MenuState(MenuState),
    TutorialState(tutorial::TutorialState),
    Restart,
    Quit,
}

fn init_play_menu(mut commands: Commands) {
    info!("Initializing Play menu");

    commands
        .spawn((
            MenuState::Play,
            NodeBundle {
                style: Style {
                    width: Val::Percent(100.0),
                    height: Val::Percent(100.0),
                    justify_content: JustifyContent::Center,
                    align_items: AlignItems::Center,
                    flex_direction: FlexDirection::Column,
                    position_type: PositionType::Absolute,
                    ..default()
                },
                background_color: Color::NONE.into(),
                visibility: Visibility::Hidden,
                ..default()
            },
        ))
        .with_children(|parent| {
            // Title
            parent.spawn((
                TextBundle::from_section(
                    "M A R T I A N   C H E S S",
                    TextStyle {
                        font_size: 48.0,
                        color: Color::ORANGE_RED,
                        ..default()
                    },
                ),
            ));

            // Continue button
            parent
                .spawn((
                    ButtonAction::MenuState(MenuState::None),
                    ButtonBundle {
                        style: Style {
                            padding: UiRect::all(Val::Px(5.0)),
                            margin: UiRect::all(Val::Px(5.0)),
                            ..default()
                        },
                        background_color: Color::ORANGE.with_a(0.5).into(),
                        ..default()
                    },
                ))
                .with_children(|parent| {
                    parent.spawn((
                        TextBundle::from_section(
                            "Continue",
                            TextStyle {
                                color: Color::BLACK,
                                font_size: 32.0,
                                ..default()
                            },
                        ),
                    ));
                });

            // Tutorial button
            parent
                .spawn((
                    ButtonAction::TutorialState(tutorial::TutorialState::Intro),
                    ButtonBundle {
                        style: Style {
                            padding: UiRect::all(Val::Px(5.0)),
                            margin: UiRect::all(Val::Px(5.0)),
                            ..default()
                        },
                        background_color: Color::ORANGE.with_a(0.5).into(),
                        ..default()
                    },
                ))
                .with_children(|parent| {
                    parent.spawn((
                        TextBundle::from_section(
                            "Tutorial",
                            TextStyle {
                                color: Color::BLACK,
                                font_size: 32.0,
                                ..default()
                            },
                        ),
                    ));
                });

            // Credits button
            parent
                .spawn((
                    ButtonAction::GameState(GameState::Credits),
                    ButtonBundle {
                        style: Style {
                            padding: UiRect::all(Val::Px(5.0)),
                            margin: UiRect::all(Val::Px(5.0)),
                            ..default()
                        },
                        background_color: Color::ORANGE.with_a(0.5).into(),
                        ..default()
                    },
                ))
                .with_children(|parent| {
                    parent.spawn((
                        TextBundle::from_section(
                            "Credits",
                            TextStyle {
                                color: Color::BLACK,
                                font_size: 32.0,
                                ..default()
                            },
                        ),
                    ));
                });

            // Quit button
            parent
                .spawn((
                    ButtonAction::Quit,
                    ButtonBundle {
                    style: Style {
                        padding: UiRect::all(Val::Px(5.0)),
                        margin: UiRect::all(Val::Px(5.0)),
                        ..default()
                    },
                    background_color: Color::ORANGE.with_a(0.5).into(),
                    ..default()
                },))
                .with_children(|parent| {
                    parent.spawn((TextBundle::from_section(
                        "Quit",
                        TextStyle {
                            color: Color::BLACK,
                            font_size: 32.0,
                            ..default()
                        },
                    ),));
                });
        });
}

fn init_tutorial_menu(mut commands: Commands) {
    commands
        .spawn((
            MenuState::Tutorial,
            NodeBundle {
                style: Style {
                    width: Val::Percent(100.0),
                    height: Val::Percent(100.0),
                    justify_content: JustifyContent::Center,
                    align_items: AlignItems::Center,
                    flex_direction: FlexDirection::Column,
                    position_type: PositionType::Absolute,
                    ..default()
                },
                background_color: Color::NONE.into(),
                visibility: Visibility::Hidden,
                ..default()
            },
        ))
        .with_children(|parent| {
            // Continue button
            parent
                .spawn((
                    ButtonAction::MenuState(MenuState::None),
                    ButtonBundle {
                        style: Style {
                            padding: UiRect::all(Val::Px(5.0)),
                            margin: UiRect::all(Val::Px(5.0)),
                            ..default()
                        },
                        background_color: Color::ORANGE.with_a(0.5).into(),
                        ..default()
                    },
                ))
                .with_children(|parent| {
                    parent.spawn((
                        TextBundle::from_section(
                            "Continue Game",
                            TextStyle {
                                color: Color::BLACK,
                                font_size: 32.0,
                                ..default()
                            },
                        ),
                    ));
                });

            // Quit button
            parent
                .spawn((
                    ButtonAction::Restart,
                    ButtonBundle {
                    style: Style {
                        padding: UiRect::all(Val::Px(5.0)),
                        margin: UiRect::all(Val::Px(5.0)),
                        ..default()
                    },
                    background_color: Color::ORANGE.with_a(0.5).into(),
                    ..default()
                },))
                .with_children(|parent| {
                    parent.spawn((TextBundle::from_section(
                        "Restart",
                        TextStyle {
                            color: Color::BLACK,
                            font_size: 32.0,
                            ..default()
                        },
                    ),));
                });
        });
}

fn init_endgame_menu(mut commands: Commands) {
    commands
        .spawn((
            MenuState::Endgame,
            NodeBundle {
                style: Style {
                    width: Val::Percent(100.0),
                    height: Val::Percent(100.0),
                    justify_content: JustifyContent::Center,
                    align_items: AlignItems::Center,
                    flex_direction: FlexDirection::Column,
                    position_type: PositionType::Absolute,
                    ..default()
                },
                background_color: Color::NONE.into(),
                visibility: Visibility::Hidden,
                ..default()
            },
        ))
        .with_children(|parent| {
            // Continue button
            parent
                .spawn((
                    ButtonAction::Restart,
                    ButtonBundle {
                        style: Style {
                            padding: UiRect::all(Val::Px(5.0)),
                            margin: UiRect::all(Val::Px(5.0)),
                            ..default()
                        },
                        background_color: Color::ORANGE.with_a(0.5).into(),
                        ..default()
                    },
                ))
                .with_children(|parent| {
                    parent.spawn((
                        TextBundle::from_section(
                            "New Game",
                            TextStyle {
                                color: Color::BLACK,
                                font_size: 32.0,
                                ..default()
                            },
                        ),
                    ));
                });

            // Quit button
            parent
                .spawn((
                    ButtonAction::Quit,
                    ButtonBundle {
                    style: Style {
                        padding: UiRect::all(Val::Px(5.0)),
                        margin: UiRect::all(Val::Px(5.0)),
                        ..default()
                    },
                    background_color: Color::ORANGE.with_a(0.5).into(),
                    ..default()
                },))
                .with_children(|parent| {
                    parent.spawn((TextBundle::from_section(
                        "Quit",
                        TextStyle {
                            color: Color::BLACK,
                            font_size: 32.0,
                            ..default()
                        },
                    ),));
                });
        });
}


fn set_menu_state(
    game_state: Res<State<GameState>>,
    mut next_menu_state: ResMut<NextState<MenuState>>,
) {
    match game_state.get() {
        GameState::Loading => error!("No menu while loading!"),
        GameState::Play => next_menu_state.set(MenuState::Play),
        GameState::Endgame => next_menu_state.set(MenuState::Endgame),
        GameState::Intro => error!("Should skip to GameState::Play"),
        GameState::Credits => error!("Should pop back to GameState::Play")
    }
}