mod camera;
mod game;
mod input;
mod main_menu;
mod movement;
mod player;
mod prelude;
mod statue;

use bevy::asset::load_internal_binary_asset;
use bevy::audio::{AudioPlugin, SpatialScale};
use bevy::diagnostic::{DiagnosticsStore, FrameTimeDiagnosticsPlugin};
use bevy::window::{PrimaryWindow, WindowMode};
use input::Input;
use prelude::*;
use statue::SpawnStatueEvent;

#[derive(States, Default, Debug, Clone, PartialEq, Eq, Hash)]
pub enum Game {
    #[default]
    Running,
    Paused,
}

#[derive(States, Default, Debug, Clone, PartialEq, Eq, Hash)]
pub enum View {
    #[default]
    LoadingScreen,
    MainMenu,
    InGame,
}

#[derive(SystemSet, Debug, Clone, PartialEq, Eq, Hash)]
struct MainMenuSet;

#[derive(SystemSet, Debug, Clone, PartialEq, Eq, Hash)]
struct InGameSet;

const AUDIO_SCALE: f32 = 1. / 200.0;

fn main() -> AppExit {
    let mut app = App::new();

    app.add_plugins((
        DefaultPlugins
            .set(WindowPlugin {
                primary_window: Some(Window {
                    title: "Kodo Tag".into(),
                    // mode: bevy::window::WindowMode::BorderlessFullscreen,
                    mode: bevy::window::WindowMode::Windowed,
                    // resolution: (640. * 2., 360. * 2.).into(),
                    ..default()
                }),
                ..default()
            })
            .set(AudioPlugin {
                default_spatial_scale: SpatialScale::new_2d(AUDIO_SCALE),
                global_volume: GlobalVolume::new(1.),
                ..default()
            })
            .set(ImagePlugin::default_nearest()),
        FrameTimeDiagnosticsPlugin,
        bevy_framepace::FramepacePlugin,
        bevy_inspector_egui::quick::WorldInspectorPlugin::new(),
    ));

    load_internal_binary_asset!(
        app,
        TextStyle::default().font,
        "../assets/font/iosevka-lyteterm-regular.subset.ttf",
        |bytes: &[u8], _path: String| { Font::try_from_bytes(bytes.to_vec()).unwrap() }
    );

    app.init_resource::<input::Input>()
        .init_state::<View>()
        .init_state::<Game>();

    app.insert_resource(AmbientLight {
        color: Color::srgb(1., 1., 1.),
        brightness: 1.,
    });

    app.configure_sets(
        Update,
        (
            MainMenuSet.run_if(in_state(View::MainMenu)),
            InGameSet
                .run_if(in_state(View::InGame))
                .after(input::process_input),
        ),
    );

    app.add_event::<SpawnStatueEvent>();

    app.add_systems(OnEnter(View::MainMenu), main_menu::startup)
        .add_systems(OnExit(View::MainMenu), main_menu::exit)
        .add_systems(OnEnter(View::InGame), (player::startup, statue::startup))
        .add_systems(OnExit(View::InGame), (player::exit, statue::exit))
        .add_systems(OnEnter(View::LoadingScreen), (startup, camera::startup))
        .add_systems(
            Update,
            (
                finish_setup.run_if(in_state(View::LoadingScreen)),
                input::process_input,
                (update,).after(input::process_input),
                (
                    player::control,
                    player::meow_on_r,
                    player::player_debug_info,
                    statue::spawn_statue,
                    movement::update_velocity_by_heading,
                    movement::resolve_velocity.after(movement::update_velocity_by_heading),
                    movement::ysort.after(movement::update_velocity_by_heading),
                    camera::update
                        .after(player::control)
                        .after(movement::resolve_velocity),
                )
                    .after(input::process_input)
                    .in_set(InGameSet),
                (main_menu::update).in_set(MainMenuSet),
            ),
        )
        .insert_resource(ClearColor(Color::srgb(0.3, 0.1, 0.5)));
    app.run()
}

#[derive(Component)]
struct FpsText;

fn finish_setup(mut app_state: ResMut<NextState<View>>) {
    app_state.set(View::MainMenu);
}

fn startup(mut commands: Commands) {
    let font_size = 48.;
    commands.spawn((
        FpsText,
        TextBundle::from_sections([
            TextSection::new(
                "FPS: ",
                TextStyle {
                    font_size,
                    ..default()
                },
            ),
            TextSection::from_style(TextStyle {
                font_size,
                color: Color::hsla(0.5, 0.5, 0.5, 0.5),
                ..default()
            }),
        ])
        .with_style(Style {
            position_type: PositionType::Absolute,
            bottom: Val::Px(5.0),
            right: Val::Px(5.0),
            ..default()
        }),
    ));
}

fn update(
    view: Res<State<View>>,
    input: Res<Input>,
    mut next_state: ResMut<NextState<crate::View>>,
    diagnostics: Res<DiagnosticsStore>,
    mut query: Query<&mut Text, With<FpsText>>,
    mut window: Query<&mut Window, With<PrimaryWindow>>,
    keys: Res<ButtonInput<KeyCode>>,
    mut app_exit_events: ResMut<Events<bevy::app::AppExit>>,
) {
    if input.cancel {
        match view.get() {
            View::InGame => {
                next_state.set(crate::View::MainMenu);
            }
            View::MainMenu => {
                app_exit_events.send(AppExit::Success);
            }
            View::LoadingScreen => {}
        }
    } else if input.action {
        match view.get() {
            View::InGame => {}
            View::MainMenu => {
                next_state.set(crate::View::InGame);
            }
            View::LoadingScreen => {}
        }
    }
    if keys.just_pressed(KeyCode::Enter)
        && (keys.pressed(KeyCode::AltLeft) || keys.pressed(KeyCode::AltRight))
    {
        if let Ok(window) = window.get_single_mut() {
            let mut window = window;
            if window.mode == WindowMode::Windowed {
                window.mode = WindowMode::BorderlessFullscreen
            } else {
                window.mode = WindowMode::Windowed
            }
        }
    }
    for mut text in &mut query {
        if let Some(fps) = diagnostics.get(&FrameTimeDiagnosticsPlugin::FPS) {
            if let Some(value) = fps.smoothed() {
                text.sections[1].value = format!("{value:.2}");
            }
        }
    }
}