package handler

import (
	"carrotskin/internal/container"
	"carrotskin/internal/model"
	"carrotskin/internal/service"
	"carrotskin/internal/types"
	"strconv"

	"github.com/gin-gonic/gin"
	"go.uber.org/zap"
)

// TextureHandler 材质处理器（依赖注入版本）
type TextureHandler struct {
	container *container.Container
	logger    *zap.Logger
}

// NewTextureHandler 创建TextureHandler实例
func NewTextureHandler(c *container.Container) *TextureHandler {
	return &TextureHandler{
		container: c,
		logger:    c.Logger,
	}
}

// Get 获取材质详情
func (h *TextureHandler) Get(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的材质ID", err)
		return
	}

	texture, err := h.container.TextureService.GetByID(c.Request.Context(), id)
	if err != nil {
		RespondNotFound(c, err.Error())
		return
	}

	RespondSuccess(c, TextureToTextureInfo(texture))
}

// Search 搜索材质
func (h *TextureHandler) Search(c *gin.Context) {
	keyword := c.Query("keyword")
	textureTypeStr := c.Query("type")
	publicOnly := c.Query("public_only") == "true"

	page := parseIntWithDefault(c.DefaultQuery("page", "1"), 1)
	pageSize := parseIntWithDefault(c.DefaultQuery("page_size", "20"), 20)

	var textureType model.TextureType
	switch textureTypeStr {
	case "SKIN":
		textureType = model.TextureTypeSkin
	case "CAPE":
		textureType = model.TextureTypeCape
	}

	textures, total, err := h.container.TextureService.Search(c.Request.Context(), keyword, textureType, publicOnly, page, pageSize)
	if err != nil {
		h.logger.Error("搜索材质失败", zap.String("keyword", keyword), zap.Error(err))
		RespondServerError(c, "搜索材质失败", err)
		return
	}

	// 返回格式：
	// {
	//   "code": 200,
	//   "message": "操作成功",
	//   "data": {
	//     "list": [...],
	//     "total": 1,
	//     "page": 1,
	//     "per_page": 5
	//   }
	// }
	RespondSuccess(c, gin.H{
		"list":     TexturesToTextureInfos(textures),
		"total":    total,
		"page":     page,
		"per_page": pageSize,
	})
}

// RenderTexture 渲染皮肤/披风预览
func (h *TextureHandler) RenderTexture(c *gin.Context) {
	textureID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的材质ID", err)
		return
	}
	renderType := service.RenderType(c.DefaultQuery("type", string(service.RenderTypeIsometric)))
	size := parseIntWithDefault(c.DefaultQuery("size", "256"), 256)
	format := service.ImageFormat(c.DefaultQuery("format", string(service.ImageFormatPNG)))

	result, err := h.container.TextureRenderService.RenderTexture(c.Request.Context(), textureID, renderType, size, format)
	if err != nil {
		RespondBadRequest(c, err.Error(), err)
		return
	}
	RespondSuccess(c, toRenderResponse(result))
}

// RenderAvatar 渲染头像（2D/3D）
func (h *TextureHandler) RenderAvatar(c *gin.Context) {
	textureID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的材质ID", err)
		return
	}
	mode := service.AvatarMode(c.DefaultQuery("mode", string(service.AvatarMode2D)))
	size := parseIntWithDefault(c.DefaultQuery("size", "256"), 256)
	format := service.ImageFormat(c.DefaultQuery("format", string(service.ImageFormatPNG)))

	result, err := h.container.TextureRenderService.RenderAvatar(c.Request.Context(), textureID, size, mode, format)
	if err != nil {
		RespondBadRequest(c, err.Error(), err)
		return
	}
	RespondSuccess(c, toRenderResponse(result))
}

// RenderCape 渲染披风
func (h *TextureHandler) RenderCape(c *gin.Context) {
	textureID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的材质ID", err)
		return
	}
	size := parseIntWithDefault(c.DefaultQuery("size", "256"), 256)
	format := service.ImageFormat(c.DefaultQuery("format", string(service.ImageFormatPNG)))

	result, err := h.container.TextureRenderService.RenderCape(c.Request.Context(), textureID, size, format)
	if err != nil {
		RespondBadRequest(c, err.Error(), err)
		return
	}
	RespondSuccess(c, toRenderResponse(result))
}

// RenderPreview 自动选择预览（皮肤走等距，披风走披风渲染）
func (h *TextureHandler) RenderPreview(c *gin.Context) {
	textureID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的材质ID", err)
		return
	}
	size := parseIntWithDefault(c.DefaultQuery("size", "256"), 256)
	format := service.ImageFormat(c.DefaultQuery("format", string(service.ImageFormatPNG)))

	result, err := h.container.TextureRenderService.RenderPreview(c.Request.Context(), textureID, size, format)
	if err != nil {
		RespondBadRequest(c, err.Error(), err)
		return
	}
	RespondSuccess(c, toRenderResponse(result))
}

// toRenderResponse 转换为API响应
func toRenderResponse(r *service.RenderResult) *types.RenderResponse {
	if r == nil {
		return nil
	}
	resp := &types.RenderResponse{
		URL:         r.URL,
		ContentType: r.ContentType,
		ETag:        r.ETag,
		Size:        r.Size,
	}
	if !r.LastModified.IsZero() {
		t := r.LastModified
		resp.LastModified = &t
	}
	return resp
}

// Update 更新材质
func (h *TextureHandler) Update(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	textureID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的材质ID", err)
		return
	}

	var req types.UpdateTextureRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		RespondBadRequest(c, "请求参数错误", err)
		return
	}

	texture, err := h.container.TextureService.Update(c.Request.Context(), textureID, userID, req.Name, req.Description, req.IsPublic)
	if err != nil {
		h.logger.Error("更新材质失败",
			zap.Int64("user_id", userID),
			zap.Int64("texture_id", textureID),
			zap.Error(err),
		)
		RespondForbidden(c, err.Error())
		return
	}

	RespondSuccess(c, TextureToTextureInfo(texture))
}

// Delete 删除材质
func (h *TextureHandler) Delete(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	textureID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的材质ID", err)
		return
	}

	if err := h.container.TextureService.Delete(c.Request.Context(), textureID, userID); err != nil {
		h.logger.Error("删除材质失败",
			zap.Int64("user_id", userID),
			zap.Int64("texture_id", textureID),
			zap.Error(err),
		)
		RespondForbidden(c, err.Error())
		return
	}

	RespondSuccess(c, nil)
}

// ToggleFavorite 切换收藏状态
func (h *TextureHandler) ToggleFavorite(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	textureID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的材质ID", err)
		return
	}

	isFavorited, err := h.container.TextureService.ToggleFavorite(c.Request.Context(), userID, textureID)
	if err != nil {
		h.logger.Error("切换收藏状态失败",
			zap.Int64("user_id", userID),
			zap.Int64("texture_id", textureID),
			zap.Error(err),
		)
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	RespondSuccess(c, map[string]bool{"is_favorited": isFavorited})
}

// GetUserTextures 获取用户上传的材质列表
func (h *TextureHandler) GetUserTextures(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	page := parseIntWithDefault(c.DefaultQuery("page", "1"), 1)
	pageSize := parseIntWithDefault(c.DefaultQuery("page_size", "20"), 20)

	textures, total, err := h.container.TextureService.GetByUserID(c.Request.Context(), userID, page, pageSize)
	if err != nil {
		h.logger.Error("获取用户材质列表失败", zap.Int64("user_id", userID), zap.Error(err))
		RespondServerError(c, "获取材质列表失败", err)
		return
	}

	RespondSuccess(c, gin.H{
		"list":     TexturesToTextureInfos(textures),
		"total":    total,
		"page":     page,
		"per_page": pageSize,
	})
}

// GetUserFavorites 获取用户收藏的材质列表
func (h *TextureHandler) GetUserFavorites(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	page := parseIntWithDefault(c.DefaultQuery("page", "1"), 1)
	pageSize := parseIntWithDefault(c.DefaultQuery("page_size", "20"), 20)

	textures, total, err := h.container.TextureService.GetUserFavorites(c.Request.Context(), userID, page, pageSize)
	if err != nil {
		h.logger.Error("获取用户收藏列表失败", zap.Int64("user_id", userID), zap.Error(err))
		RespondServerError(c, "获取收藏列表失败", err)
		return
	}

	RespondSuccess(c, gin.H{
		"list":     TexturesToTextureInfos(textures),
		"total":    total,
		"page":     page,
		"per_page": pageSize,
	})
}

// Upload 直接上传材质文件
func (h *TextureHandler) Upload(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	// 解析multipart表单
	if err := c.Request.ParseMultipartForm(32 << 20); err != nil { // 32MB
		RespondBadRequest(c, "解析表单失败", err)
		return
	}

	// 获取文件
	file, err := c.FormFile("file")
	if err != nil {
		RespondBadRequest(c, "获取文件失败", err)
		return
	}

	// 读取文件内容
	src, err := file.Open()
	if err != nil {
		RespondBadRequest(c, "打开文件失败", err)
		return
	}
	defer src.Close()

	fileData := make([]byte, file.Size)
	if _, err := src.Read(fileData); err != nil {
		RespondBadRequest(c, "读取文件失败", err)
		return
	}

	// 获取表单字段
	name := c.PostForm("name")
	if name == "" {
		RespondBadRequest(c, "名称不能为空", nil)
		return
	}

	description := c.PostForm("description")
	textureType := c.PostForm("type")
	if textureType == "" {
		textureType = "SKIN" // 默认值
	}

	isPublic := c.PostForm("is_public") == "true"
	isSlim := c.PostForm("is_slim") == "true"

	// 检查上传限制
	maxTextures := h.container.UserService.GetMaxTexturesPerUser()
	if err := h.container.TextureService.CheckUploadLimit(c.Request.Context(), userID, maxTextures); err != nil {
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	// 调用服务上传
	texture, err := h.container.TextureService.UploadTexture(
		c.Request.Context(),
		userID,
		name,
		description,
		textureType,
		fileData,
		file.Filename,
		isPublic,
		isSlim,
	)
	if err != nil {
		h.logger.Error("上传材质失败",
			zap.Int64("user_id", userID),
			zap.String("file_name", file.Filename),
			zap.Error(err),
		)
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	RespondSuccess(c, TextureToTextureInfo(texture))
}