use bevy::{post_process::bloom::Bloom, prelude::*, sprite::Anchor};
use rand::Rng;

use crate::utils::input::{GameInputPlugin, InputButton, InputPressStatus};

mod utils;

#[derive(Component)]
pub struct PlayerVWBus;

#[derive(States, Default, Debug, Clone, PartialEq, Eq, Hash)]
pub enum GameState {
    #[default]
    Navi,
    Pause,
    Combat,
}

const PLAYER_SPEED: f32 = 100.;

fn main() {
    println!("Hello, world!");
    App::new()
        .add_plugins((DefaultPlugins, GameInputPlugin))
        .init_state::<GameState>()
        .add_systems(Startup, (setup_scene, spawn_bus, spawn_enemy))
        .add_systems(
            Update,
            (move_player.run_if(in_state(GameState::Navi)), follow_player),
        )
        .run();
}

fn setup_scene(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    commands.spawn((
        Mesh2d(meshes.add(Rectangle::new(1000., 70.))),
        MeshMaterial2d(materials.add(Color::srgb(0.2, 0.2, 0.3))),
    ));

    commands.spawn((Camera2d, Bloom::NATURAL));
}

fn spawn_bus(mut commands: Commands, asset_server: Res<AssetServer>) {
    let texture = asset_server.load("bus/basicbus.png");
    commands.spawn((
        PlayerVWBus,
        Sprite {
            image: texture,
            custom_size: Some(Vec2::new(192., 133.)),
            ..default()
        },
        Transform::from_xyz(2., 0., 3.),
        Anchor::CENTER,
    ));
}

fn spawn_enemy(
    mut commands: Commands,
    mut meshes: ResMut<Assets<Mesh>>,
    mut materials: ResMut<Assets<ColorMaterial>>,
) {
    let mut rng = rand::rng();
    for _ in 0..10 {
        commands.spawn((
            Mesh2d(meshes.add(Circle::new(10.))),
            MeshMaterial2d(materials.add(Color::srgb(1.1, 0.2, 0.3))),
            Transform::from_xyz(
                rng.random_range(-600..600) as f32,
                rng.random_range(-600..600) as f32,
                1.,
            ),
        ));
    }
}

fn move_player(
    mut player: Single<&mut Transform, With<PlayerVWBus>>,
    mut player_sprite: Single<&mut Sprite, With<PlayerVWBus>>,
    time: Res<Time>,
    buttons_pressed: Res<InputPressStatus>,
) {
    let mut direction = Vec2::ZERO;

    if buttons_pressed.contains(InputButton::Up) {
        direction.y += 1.;
    }

    if buttons_pressed.contains(InputButton::Down) {
        direction.y -= 1.;
    }

    if buttons_pressed.contains(InputButton::Left) {
        direction.x -= 1.;
    }

    if buttons_pressed.contains(InputButton::Right) {
        direction.x += 1.;
    }

    let move_delta = direction.normalize_or_zero() * PLAYER_SPEED * time.delta_secs();
    player.translation += move_delta.extend(0.);

    if direction.x > 0. {
        player_sprite.flip_x = true;
    } else if direction.x < 0. {
        player_sprite.flip_x = false;
    }
}

fn follow_player(
    mut camera: Single<&mut Transform, (With<Camera2d>, Without<PlayerVWBus>)>,
    player: Single<&Transform, (With<PlayerVWBus>, Without<Camera2d>)>,
    time: Res<Time>,
) {
    let Vec3 { x, y, .. } = player.translation;
    let direction = Vec3::new(x, y, camera.translation.z);

    camera
        .translation
        .smooth_nudge(&direction, 10., time.delta_secs());
}