package main

const (
	BULLET_LINEAR = iota
)

const (
	STAGE_WIDTH              float64 = 90.0
	STAGE_HEIGHT             float64 = 160.0
	BULLET_KILL_BUFFER_WIDTH float64 = 16.0
)

type Bullet struct {
	Class      int
	SpawnTime  int64
	SpawnX     float64
	SpawnY     float64
	Parameters []float64
}

func (b Bullet) GetCurrentPos(tick int64) (float64, float64) {
	switch b.Class {
	case BULLET_LINEAR:
		return b.SpawnX + (b.Parameters[0] * float64(tick-b.SpawnTime)), b.SpawnY + (b.Parameters[1] * float64(tick-b.SpawnTime))
	default:
		return b.SpawnX, b.SpawnY
	}
}

func (b Bullet) BeyondKillBoundary(tick int64) bool {
	x, y := b.GetCurrentPos(tick)
	return (x < 0.0-BULLET_KILL_BUFFER_WIDTH) || (x > STAGE_WIDTH+BULLET_KILL_BUFFER_WIDTH) || (y < 0.0-BULLET_KILL_BUFFER_WIDTH) || (y > STAGE_HEIGHT+BULLET_KILL_BUFFER_WIDTH)
}