use bevy::prelude::*;
use rand::{prelude::*, rng};

use crate::{
    FIRST_CORNER_X, FIRST_CORNER_Y, GameState, SECOND_CORNER_X, SECOND_CORNER_Y,
    ships::enemy::spawn_enemy,
};

pub mod enemy;
pub mod gun;
pub mod player;

#[derive(Component, Copy, Clone, PartialEq, Eq)]
pub enum Factions {
    PlayerFaction,
    EnemyFaction,
}

impl Factions {
    pub fn can_damage(&self, other: &Factions) -> bool {
        match self {
            Factions::PlayerFaction => match other {
                Factions::PlayerFaction => false,
                Factions::EnemyFaction => true,
            },
            Factions::EnemyFaction => match other {
                Factions::PlayerFaction => true,
                Factions::EnemyFaction => false,
            },
        }
    }
}

pub struct ShipsPlugin;

impl Plugin for ShipsPlugin {
    fn build(&self, app: &mut bevy::app::App) {
        app.insert_resource(Time::<Fixed>::from_hz(60.))
            .add_systems(OnEnter(GameState::Game), startup)
            .add_systems(
                FixedUpdate,
                (
                    player::player_movement_system.run_if(in_state(GameState::Game)),
                    player::player_shooting_system.run_if(in_state(GameState::Game)),
                    gun::gun_shooting_system.run_if(in_state(GameState::Game)),
                    enemy::enemy_ai_system.run_if(in_state(GameState::Game)),
                ),
            )
            .add_observer(player::player_death_observer);
    }
}

fn startup(mut commands: Commands, asset_server: Res<AssetServer>) {
    let player_sprite: Handle<Image> = asset_server.load("player.png");
    let enemy_sprite: Handle<Image> = asset_server.load("enemy.png");

    player::spawn_player(&mut commands, player_sprite, Vec2::new(0., 0.));

    let mut random = rng();

    for _ in 0..50 {
        let position = Vec2::new(
            random.random_range(FIRST_CORNER_X..SECOND_CORNER_X),
            random.random_range(FIRST_CORNER_Y..SECOND_CORNER_Y),
        );

        spawn_enemy(&mut commands, enemy_sprite.clone(), position);
    }
}