// title:  game title
// author: Fabien Freling
// desc:   (Major Jam 8)
// script: wren

import "random" for Random

var W = 240
var H = 136
var R = Random.new()

class Star {
	construct new(x, y, size, scrollSpeed, color) {
		_x = x
		_y = y
		_size = size
		_scrollSpeed = scrollSpeed
		_color = color
	}

	update() {
		_x = _x - _scrollSpeed
	}

	draw() {
		TIC.circ(_x, _y, _size, _color)
	}

	expired {
		_x + _size < 0
	}
}

class Bullet {
	construct new(x, y) {
		_x = x
		_y = y
		_w = 3
		_h = 1
		_speed = 5
	}

	x { _x }
	y { _y }
	w { _w }
	h { _h }

	update() {
		_x = _x + _speed
	}

	draw() {
		TIC.rect(_x, _y, _w, _h, 4)
	}

	expired {
		_x > W
	}
}

class Enemy {
	construct new(x, y) {
		_x = x
		_y = y
		_w = 8
		_h = 8
		_speed = 1
		_alive = true
	}

	x { _x }
	y { _y }
	w { _w }
	h { _h }
	expired { !_alive }

	update() {
		_x = _x - _speed
		if (_x < -_w) {
			_alive = false
		}
	}

	draw() {
		TIC.spr(258, _x - _w / 2, _y - _h / 2, 0)
	}

	hit() {
		_alive = false
	}
}

class Ship {
	construct new(x, y) {
		_x = x
		_y = y
		_speed = 1
		_bullets = []
	}

	bullets { _bullets }

	update() {
		if (TIC.btn(0)) {
			_y = _y - _speed
		}
		if (TIC.btn(1)) {
			_y = _y + _speed
		}
		if (TIC.btn(2)) {
			_x = _x - _speed
		}
		if (TIC.btn(3)) {
			_x = _x + _speed
		}
		_x.clamp(0, W)
		_y.clamp(0, H)

		if (TIC.btnp(4, 5, 10)) {
			shoot()
		}

		for (b in _bullets) {
			b.update()
		}
		while (_bullets.count > 0 && _bullets[0].expired) {
			_bullets.removeAt(0)
		}
	}

	draw() {
		TIC.spr(256, _x, _y, 0, 1, 0, 0, 2, 2)
		for (b in _bullets) {
			b.draw()
		}
	}

	shoot() {
		_bullets.add(Bullet.new(_x + 8, _y + 8))
	}
}

class Explosion {
	construct new(x, y) {
		System.print("explosion at %(x), %(y)")
		_x = x
		_y = y
		_countdown = 30
	}

	expired { _countdown < 0 }

	update() {
		//System.print("explosion countdown %(_countdown)")
		_countdown = _countdown - 1
	}

	draw() {
		var size = 10
		TIC.circ(_x - size / 2, _y - size / 2, size, 2)
	}
}

class World {
	construct new() {
		_t = 0
		_stars = []
		_enemies = []
		_vfx = []
		_player = Ship.new(W / 2, H / 2)
		_world_x = 0
		_world_y = 0
		_world_scroll_speed = 60 / 2

		// init background
		for (i in 0..W) {
			update()
		}

		_remap = Fn.new {|tile, x, y|
			if (tile == 33) {
				this.spawn(tile, x, y)
				return 0
			}
			return tile
		}
	}

	collect(list) {
		var i = 0
		while (i < list.count) {
			//System.print("%(list[i])")
			if (list[i].expired) {
				//System.print("remove element from list")
				list.removeAt(i)
			} else {
				i = i + 1
			}
		}
	}

	spawn(tile, x, y) {
		_enemies.add(Enemy.new(x * 4, y * 4))
		TIC.mset(x, y, 0)
	}

	update() {
		_player.update()

		for (e in _enemies) {
			e.update()
		}

		for (s in _stars) {
			s.update()
		}

		for (v in _vfx) {
			v.update()
		}

		// Collect
		while (_stars.count > 0 && _stars[0].expired) {
			_stars.removeAt(0)
		}

		collect(_enemies)
		collect(_vfx)

		// small stars
		if (_t % 30 == 0) {
			_stars.add(Star.new(W, R.int(0,H), 1, 1, 12))
		}
		// medium stars
		var width = 10
		var spaceBetween = width * 10
		var speed = 0.1
		var mediumTick = (spaceBetween + width) / speed
		if (_t % mediumTick == 0) {
			_stars.add(Star.new(W, R.int(0,H), width, speed, 13))
		}
		_t = _t + 1

		if (_t % _world_scroll_speed == 0) {
			_world_x = _world_x + 1
		}

		// Collisions
		var i = 0
		while (i < _player.bullets.count) {
			var b = _player.bullets[i]
			var touched = false
			for (e in _enemies) {
				if (collide(b.x, b.y, b.w, b.h, e.x, e.y, e.w, e.h)) {
					_player.bullets.removeAt(i)
					e.hit()
					_vfx.add(Explosion.new(e.x + e.w / 2, e.y + e.h / 2))
					touched = true
					break
				}
			}
			if (!touched) {
				i = i + 1
			}
		}
	}

	collide(x1, y1, w1, h1, x2, y2, w2, h2) {
		// [x1]  [x2]
		if (x1 + w1 < x2) {
			return false
		}
		
		// [x2]  [x1]
		if (x1 > x2 + w2) {
			return false
		}

		// [y1]
		// [y2]
		if (y1 + h2 < y2) {
			return false
		}

		// [y2]
		// [y1]
		if (y1 > y2 + h2) {
			return false
		}

		return true
	}

	draw() {
		for (s in _stars) {
			s.draw()
		}

		for (v in _vfx) {
			v.draw()
		}

		var sx = (_t % _world_scroll_speed) / (_world_scroll_speed / 8)
		TIC.map(_world_x, _world_y, 30 + 1, 17 + 1, -sx, 0, 0, 1, _remap)

		for (e in _enemies) {
			e.draw()
		}

		_player.draw()
	}
}

class Game is TIC{
	state { _state }
	static start { "start" }
	static game { "game" }

	construct new() {
		_t=0
		_x=96
		_y=24
		_state = Game.start
		_world = World.new()
	}
	
	TIC() {
		update()
		draw()
		_t=_t+1
	}

	update() {
		_world.update()
	}

	draw() {
		TIC.cls(0)
		_world.draw()
	}
}

// <TILES>
// 001:eccccccccc888888caaaaaaaca888888cacccccccacc0ccccacc0ccccacc0ccc
// 002:ccccceee8888cceeaaaa0cee888a0ceeccca0ccc0cca0c0c0cca0c0c0cca0c0c
// 003:eccccccccc888888caaaaaaaca888888cacccccccacccccccacc0ccccacc0ccc
// 004:ccccceee8888cceeaaaa0cee888a0ceeccca0cccccca0c0c0cca0c0c0cca0c0c
// 005:2222222223312331231123112111211122222222233123312311231121112111
// 017:cacccccccaaaaaaacaaacaaacaaaaccccaaaaaaac8888888cc000cccecccccec
// 018:ccca00ccaaaa0ccecaaa0ceeaaaa0ceeaaaa0cee8888ccee000cceeecccceeee
// 019:cacccccccaaaaaaacaaacaaacaaaaccccaaaaaaac8888888cc000cccecccccec
// 020:ccca00ccaaaa0ccecaaa0ceeaaaa0ceeaaaa0cee8888ccee000cceeecccceeee
// 033:0000000000000000000000000002200000022000000000000000000000000000
// 034:0000000000000000000000000003300000033000000000000000000000000000
// </TILES>

// <SPRITES>
// 000:00000000000000000ccc000000eccccc00eeeeee4ddddddd4cccccdd43ddddcc
// 001:00000000000000000000000000000000ee990000ddaa9900ddaaaa90ccaaaaa9
// 002:2000000202333320032222300320023003200230032222300233332020000002
// 016:43dddddd4ddddddd4eeeeeee0ccccccc00000000000000000000000000000000
// 017:ddccccccddddddd0eeeeee000000000000000000000000000000000000000000
// </SPRITES>

// <MAP>
// 006:000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 014:000000000000000000000000000000000000000000000000000000000000000000000000005000000000000000500000000000000050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 015:000000000000000000000000000000000000000000000000000000000000000000000000505050000000000050505000000000005050500000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// 016:000000000000000000000000000000000000000000000000000000000000505050505050505050505050505050505050505050505050505050505050000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
// </MAP>

// <WAVES>
// 000:00000000ffffffff00000000ffffffff
// 001:0123456789abcdeffedcba9876543210
// 002:0123456789abcdef0123456789abcdef
// </WAVES>

// <SFX>
// 000:000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000304000000000
// </SFX>

// <PALETTE>
// 000:1a1c2c5d275db13e53ef7d57ffcd75a7f07038b76425717929366f3b5dc941a6f673eff7f4f4f494b0c2566c86333c57
// </PALETTE>