package net.shadowfacts.cacao.util

/**
 * Helper class that represents a texture that can be divided into nine pieces (4 corners, 4 edges, and the center)
 * and can be drawn at any size by combining and repeating those pieces.
 *
 * It also provides convenience [Texture] objects that represent the different patches.
 *
 * @author shadowfacts
 * @param texture The base [Texture] object.
 * @param cornerWidth The width of each corner (and therefore the width of the vertical edges).
 * @param cornerHeight The height of each corner (and therefore the height of the horizontal edges.)
 * @param centerWidth The width of the center patch.
 * @param centerHeight The height of the center patch.
 */
data class NinePatchTexture(val texture: Texture, val cornerWidth: Int, val cornerHeight: Int, val centerWidth: Int, val centerHeight: Int) {

	// Corners
	val topLeft by lazy {
		texture
	}
	val topRight by lazy {
		Texture(texture.location, texture.u  + cornerWidth + centerWidth, texture.v, texture.width, texture.height)
	}
	val bottomLeft by lazy {
		Texture(texture.location, texture.u, texture.v + cornerHeight + centerHeight, texture.width, texture.height)
	}
	val bottomRight by lazy {
		Texture(texture.location, topRight.u, bottomLeft.v, texture.width, texture.height)
	}

	// Edges
	val topMiddle by lazy {
		Texture(texture.location, texture.u + cornerWidth, texture.v, texture.width, texture.height)
	}
	val bottomMiddle by lazy {
		Texture(texture.location, topMiddle.u, bottomLeft.v, texture.width, texture.height)
	}
	val leftMiddle by lazy {
		Texture(texture.location, texture.u, texture.v + cornerHeight, texture.width, texture.height)
	}
	val rightMiddle by lazy {
		Texture(texture.location, topRight.u, leftMiddle.v, texture.width, texture.height)
	}

	// Center
	val center by lazy {
		Texture(texture.location, texture.u + cornerWidth, texture.v + cornerHeight, texture.width, texture.height)
	}

}