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extern crate nccl;
extern crate time;
extern crate sdl2;

use sdl2::pixels::Color;
use sdl2::event::Event;
pub use sdl2::keyboard::Keycode;

pub mod error;
pub mod settings;
pub mod game;
pub mod graphics;

use error::*;
use game::*;
use graphics::Graphics;
use settings::Settings;

pub fn game_loop<T: GameState>(mut game: T, settings: Settings) -> AsteroidResult {
    let sdl_context = sdl2::init().unwrap();
    let window_builder = sdl_context.video().unwrap();

    let window = window_builder.window(&settings.title, settings.width, settings.height)
        .opengl()
        .position_centered()
        .build().unwrap();

    let canvas = window.into_canvas();
    let mut canvas = if settings.vsync {
        canvas.present_vsync()
    } else { canvas }.build().unwrap();

    canvas.set_draw_color(Color::RGB(0, 0, 0));
    canvas.clear();
    canvas.present();
    let mut event_loop = sdl_context.event_pump().unwrap();

    let mut err = None;
    let mut args = Args::new();

    let mut graphics = Graphics::new(canvas);

    let mut current_time = time::precise_time_s();
    let dt = 1./180.;

    let mut frames = 0;
    let mut second = 0.;

    while err.is_none() {
        let mut steps = 0;
        let new_time = time::precise_time_s();
        let mut frame_time = new_time - current_time;
        current_time = new_time;

        while frame_time > 0. {
            let delta_time = if frame_time <= dt { frame_time } else { dt };
            for event in event_loop.poll_iter() {
                match event {
                    Event::Quit {..} => err = Some(AsteroidResult::Ok),
                    Event::KeyDown { keycode: Some(Keycode::Escape), .. } => {
                        if settings.exit_on_escape {
                            err = Some(AsteroidResult::Ok);
                        } else {
                            game.keyboard_input(Keycode::Escape);
                        }
                    },
                    Event::KeyDown { keycode: Some(key), .. } => {
                        if !args.is_down(key) {
                            args.set_key_down(key);
                        }
                    },
                    Event::KeyUp { keycode: Some(key), .. } => {
                        args.set_key_up(key);
                    }
                    _ => {}
                }
            }

            graphics.canvas.set_draw_color(Color::RGB(0, 0, 0));
            graphics.canvas.clear();

            second += delta_time;
            args.set_dt(delta_time);
            game.update(&mut args);
            frame_time -= delta_time;

            steps += 1;
            if steps >= 500 {
                println!("spiral averted");
                break;
            }
        }

        game.render(&mut args, &mut graphics);

        frames += 1;
        if second >= 1. {
            second = 0.;
            frames = 0;
        }
        args.set_fps(frames as f64 / second);
        //println!("{}", frames as f64 / second);

        graphics.canvas.present();
    }

    err.unwrap()
}