package sauce

type World struct {
	Chunks []*Chunk
}

func NewWorld(width, height int) *World {
	w := &World{}

	for x := 0; x < width; x++ {
		for y := 0; y < height; y++ {
			w.Chunks = append(w.Chunks, NewChunk(10, 10))
			w.Chunks[len(w.Chunks)-1].X = x * 10
			w.Chunks[len(w.Chunks)-1].Y = y * 10
		}
	}

	return w
}

func (w *World) At(x, y int) *Cell {
	for _, chunk := range w.Chunks {
		if x >= chunk.X && x < chunk.X+chunk.Width() && y >= chunk.Y && y < chunk.Y+chunk.Height() {
			return chunk.At(x-chunk.X, y-chunk.Y)
		}
	}
	return nil
}

func (w *World) HueristicLine(x1, y1, x2, y2 int, h uint8) {
	// Draw a line from x1, y1 to x2, y2 applying the hueristic value to each cell.
	dx := x2 - x1
	dy := y2 - y1
	x := x1
	y := y1
	sx := 1
	sy := 1
	if dx < 0 {
		sx = -1
		dx = -dx
	}
	if dy < 0 {
		sy = -1
		dy = -dy
	}
	err := dx - dy
	for {
		cell := w.At(x, y)
		if cell != nil {
			cell.Hueristic = h
		}
		if x == x2 && y == y2 {
			break
		}
		e2 := 2 * err
		if e2 > -dy {
			err -= dy
			x += sx
		}
		if e2 < dx {
			err += dx
			y += sy
		}
	}
}