package skin_renderer

import (
	"image"
	"image/color"
	"image/draw"
)

// Minecraft 提供 Minecraft 皮肤渲染的入口方法
// 与 blessing/texture-renderer 的 Minecraft 类保持兼容
type Minecraft struct{}

// NewMinecraft 创建 Minecraft 渲染器实例
func NewMinecraft() *Minecraft {
	return &Minecraft{}
}

// RenderSkin 渲染完整皮肤预览（正面+背面）
// ratio: 缩放比例，默认 7.0
// isAlex: 是否为 Alex 模型（细手臂）
func (m *Minecraft) RenderSkin(skinData []byte, ratio float64, isAlex bool) (image.Image, error) {
	vp := 15 // vertical padding
	hp := 30 // horizontal padding
	ip := 15 // internal padding

	// 渲染正面（-45度）
	frontRenderer := NewSkinRenderer(ratio, false, -45, -25)
	front, err := frontRenderer.Render(skinData, isAlex)
	if err != nil {
		return nil, err
	}

	// 渲染背面（135度）
	backRenderer := NewSkinRenderer(ratio, false, 135, -25)
	back, err := backRenderer.Render(skinData, isAlex)
	if err != nil {
		return nil, err
	}

	width := front.Bounds().Dx()
	height := front.Bounds().Dy()

	// 创建画布
	canvas := createEmptyCanvas((hp+width+ip)*2, vp*2+height)

	// 绘制背面（左侧）
	draw.Draw(canvas, image.Rect(hp, vp, hp+width, vp+height), back, back.Bounds().Min, draw.Over)

	// 绘制正面（右侧）
	draw.Draw(canvas, image.Rect(hp+width+ip*2, vp, hp+width*2+ip*2, vp+height), front, front.Bounds().Min, draw.Over)

	return canvas, nil
}

// RenderCape 渲染披风
// height: 输出高度
func (m *Minecraft) RenderCape(capeData []byte, height int) (image.Image, error) {
	vp := 20 // vertical padding
	hp := 40 // horizontal padding

	renderer := NewCapeRenderer()
	cape, err := renderer.Render(capeData, height)
	if err != nil {
		return nil, err
	}

	width := cape.Bounds().Dx()
	capeHeight := cape.Bounds().Dy()

	canvas := createEmptyCanvas(hp*2+width, vp*2+capeHeight)
	draw.Draw(canvas, image.Rect(hp, vp, hp+width, vp+capeHeight), cape, cape.Bounds().Min, draw.Over)

	return canvas, nil
}

// Render2DAvatar 渲染 2D 头像
// ratio: 缩放比例，默认 15.0
func (m *Minecraft) Render2DAvatar(skinData []byte, ratio float64) (image.Image, error) {
	renderer := NewSkinRendererFull(ratio, true, 0, 0, 0, 0, 0, 0, 0, true)
	return renderer.Render(skinData, false)
}

// Render3DAvatar 渲染 3D 头像
// ratio: 缩放比例，默认 15.0
func (m *Minecraft) Render3DAvatar(skinData []byte, ratio float64) (image.Image, error) {
	renderer := NewSkinRenderer(ratio, true, 45, -25)
	return renderer.Render(skinData, false)
}

// RenderSkinWithAngle 渲染指定角度的皮肤
func (m *Minecraft) RenderSkinWithAngle(skinData []byte, ratio float64, isAlex bool, hRotation, vRotation float64) (image.Image, error) {
	renderer := NewSkinRenderer(ratio, false, hRotation, vRotation)
	return renderer.Render(skinData, isAlex)
}

// RenderHeadWithAngle 渲染指定角度的头像
func (m *Minecraft) RenderHeadWithAngle(skinData []byte, ratio float64, hRotation, vRotation float64) (image.Image, error) {
	renderer := NewSkinRenderer(ratio, true, hRotation, vRotation)
	return renderer.Render(skinData, false)
}

// createEmptyCanvas 创建透明画布
func createEmptyCanvas(width, height int) *image.RGBA {
	img := image.NewRGBA(image.Rect(0, 0, width, height))
	// 填充透明背景
	transparent := color.RGBA{0, 0, 0, 0}
	for y := 0; y < height; y++ {
		for x := 0; x < width; x++ {
			img.SetRGBA(x, y, transparent)
		}
	}
	return img
}