package robots

func (game *Game) initRobots() {
	var fabricate int = game.level * 16
	for i := 0; i < fabricate; i++ {

		var robot Robot

		robot.id = i
		robot.comms = make(chan Position)

		var found bool
		var rndPos Position
		for !found {
			rndPos = game.randPos()
			if !game.onPlayer(rndPos) {
				found = true
			}
		}

		robot.position = rndPos
		game.robots = append(game.robots, robot)
		go game.Robot(robot)
	}
}

func (game *Game) drawRobots() {
	for _, r := range game.robots {
		game.screen.SetContent(r.position.x, r.position.y, '+', nil, game.style)
	}
}

func (game *Game) moveRobots() {

	var robotPos Position

	// Iterate through the robots
	for i, _ := range game.robots {

		game.robots[i].comms <- game.player.position
		robotPos = <-game.robots[i].comms
		game.robots[i].position = robotPos

	}

	// After all the moves, lets check if any of the rowboz collided with anything
	for _, r := range game.robots {

		// Hit a player? Game over!
		if game.onPlayer(r.position) {
			game.gameover = 1
			return
		}

		// Robots mingling? Trash!
		if game.onRobot(r) {

			// Delete robot
			game.deleteRobot(r)

			// Create trash
			game.addTrash(r)

		}

		// Hugging Trash? More trash!
		if game.onTrash(r.position) {

			// Delete robot
			game.deleteRobot(r)

		}

	}
}

func (game *Game) onRobot(robot Robot) bool {
	var found bool = false
	for _, r := range game.robots {
		if robot.id != r.id && robot.position == r.position {
			found = true
		}
	}
	return found
}

func (game *Game) deleteRobot(robot Robot) {

	var rowboz []Robot

	// Delete from Array
	for _, r := range game.robots {
		if robot.id != r.id {
			rowboz = append(rowboz, r)
		}
	}
	game.robots = nil
	game.robots = rowboz

	// Close the channel
	close(robot.comms)

	game.player.score++

}

func (game *Game) Robot(robot Robot) {
	var player Position
	var robotPos Position = robot.position
	var emptyPos Position

	for {
		// Wait for input from the channel
		player = <-robot.comms

		if player == emptyPos {
			close(robot.comms)
			return
		}

		//fmt.Println(player, robotPos)

		// Determine direction to move in
		robotPos = game.moveRobot(player, robot.position)
		robot.position = robotPos

		// Return new position of robot
		robot.comms <- robotPos
	}

}

func (game *Game) moveRobot(player Position, robot Position) Position {

	var newPosition Position

	// Determine in which direction to go
	if player.x < robot.x {
		newPosition.x = robot.x - 1
	} else if player.x > robot.x {
		newPosition.x = robot.x + 1
	}

	if player.y < robot.y {
		newPosition.y = robot.y - 1
	} else if player.y > robot.y {
		newPosition.y = robot.y + 1
	}

	//fmt.Println(player, robot, newPosition)

	return newPosition
}