#[macro_use] extern crate specs_derive;

use ggez::{
    Context,
    ContextBuilder,
    GameResult,
    event::{self, EventHandler},
};

use sdl2::keyboard as sdl;

pub mod consts;
pub mod components;
pub mod game;
pub mod res;
pub mod sys;

use game::MyGame;

impl EventHandler for MyGame {

    fn update(&mut self, _ctx: &mut Context) -> GameResult<()> {
        sys::input::systems(self);
        sys::physics::systems(self);
        Ok(())
    }

    fn draw(&mut self, ctx: &mut Context) -> GameResult<()> {
        sys::drawing::systems(self, ctx)
    }

    fn key_down_event(
        &mut self,
        ctx: &mut Context,
        keycode: sdl::Keycode,
        _keymod: sdl::Mod,
        _repeat: bool,
    ) {
        if keycode == sdl::Keycode::Escape {
            ctx.quit().expect("Should never fail");
        }
        self.world.write_resource::<res::KeySet>().insert(keycode);
    }

    fn key_up_event(
        &mut self,
        _ctx: &mut Context,
        keycode: sdl::Keycode,
        _keymod: sdl::Mod,
        _repeat: bool,
    ) {
        self.world.write_resource::<res::KeySet>().remove(&keycode);
    }
}

fn main() -> Result<(), ggez::error::GameError> {
    let mut world = specs::World::new();
    components::register(&mut world);

    res::world_from_file(&mut world, "assets/main.tmx");

    // Make a Context and an EventLoop.
    let mut ctx = ContextBuilder::new("game", "me")
        .add_resource_path({
            let base = std::env::var("CARGO_MANIFEST_DIR").unwrap();
            let mut path = std::path::PathBuf::from(base);
            path.push("assets");
            path
        })
        .window_mode(ggez::conf::WindowMode {
            width: consts::WINDOW_WIDTH,
            height: consts::WINDOW_HEIGHT,
            ..Default::default()
        })
        .build()?;
    let image = ggez::graphics::Image::new(&mut ctx, "/spritesheet.png")?;
    let mut sprites = ggez::graphics::spritebatch::SpriteBatch::new(image);
    sprites.set_filter(ggez::graphics::FilterMode::Nearest);
    world.add_resource(sprites);
    world.add_resource(res::KeySet::new());

    let mut my_game = MyGame { world };

    event::run(&mut ctx, &mut my_game)
}