package handler

import (
	"carrotskin/internal/model"
	"carrotskin/internal/service"
	"carrotskin/internal/types"
	"carrotskin/pkg/config"
	"carrotskin/pkg/database"
	"carrotskin/pkg/logger"
	"carrotskin/pkg/storage"
	"net/http"
	"strconv"

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

// GenerateTextureUploadURL 生成材质上传URL
// @Summary 生成材质上传URL
// @Description 生成预签名URL用于上传材质文件
// @Tags texture
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param request body types.GenerateTextureUploadURLRequest true "上传URL请求"
// @Success 200 {object} model.Response "生成成功"
// @Failure 400 {object} model.ErrorResponse "请求参数错误"
// @Router /api/v1/texture/upload-url [post]
func GenerateTextureUploadURL(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, model.NewErrorResponse(
			model.CodeUnauthorized,
			model.MsgUnauthorized,
			nil,
		))
		return
	}

	var req types.GenerateTextureUploadURLRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"请求参数错误",
			err,
		))
		return
	}

	// 调用UploadService生成预签名URL
	storageClient := storage.MustGetClient()
	cfg := *config.MustGetRustFSConfig()
	result, err := service.GenerateTextureUploadURL(
		c.Request.Context(),
		storageClient,
		cfg,
		userID.(int64),
		req.FileName,
		string(req.TextureType),
	)
	if err != nil {
		logger.MustGetLogger().Error("生成材质上传URL失败",
			zap.Int64("user_id", userID.(int64)),
			zap.String("file_name", req.FileName),
			zap.String("texture_type", string(req.TextureType)),
			zap.Error(err),
		)
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			err.Error(),
			nil,
		))
		return
	}

	// 返回响应
	c.JSON(http.StatusOK, model.NewSuccessResponse(&types.GenerateTextureUploadURLResponse{
		PostURL:    result.PostURL,
		FormData:   result.FormData,
		TextureURL: result.FileURL,
		ExpiresIn:  900, // 15分钟 = 900秒
	}))
}

// CreateTexture 创建材质记录
// @Summary 创建材质记录
// @Description 文件上传完成后，创建材质记录到数据库
// @Tags texture
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param request body types.CreateTextureRequest true "创建材质请求"
// @Success 200 {object} model.Response "创建成功"
// @Failure 400 {object} model.ErrorResponse "请求参数错误"
// @Router /api/v1/texture [post]
func CreateTexture(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, model.NewErrorResponse(
			model.CodeUnauthorized,
			model.MsgUnauthorized,
			nil,
		))
		return
	}

	var req types.CreateTextureRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"请求参数错误",
			err,
		))
		return
	}

	// TODO: 从配置或数据库读取限制
	maxTextures := 100
	if err := service.CheckTextureUploadLimit(database.MustGetDB(), userID.(int64), maxTextures); err != nil {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			err.Error(),
			nil,
		))
		return
	}

	// 创建材质
	texture, err := service.CreateTexture(database.MustGetDB(),
		userID.(int64),
		req.Name,
		req.Description,
		string(req.Type),
		req.URL,
		req.Hash,
		req.Size,
		req.IsPublic,
		req.IsSlim,
	)
	if err != nil {
		logger.MustGetLogger().Error("创建材质失败",
			zap.Int64("user_id", userID.(int64)),
			zap.String("name", req.Name),
			zap.Error(err),
		)
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			err.Error(),
			nil,
		))
		return
	}

	// 返回响应
	c.JSON(http.StatusOK, model.NewSuccessResponse(&types.TextureInfo{
		ID:            texture.ID,
		UploaderID:    texture.UploaderID,
		Name:          texture.Name,
		Description:   texture.Description,
		Type:          types.TextureType(texture.Type),
		URL:           texture.URL,
		Hash:          texture.Hash,
		Size:          texture.Size,
		IsPublic:      texture.IsPublic,
		DownloadCount: texture.DownloadCount,
		FavoriteCount: texture.FavoriteCount,
		IsSlim:        texture.IsSlim,
		Status:        texture.Status,
		CreatedAt:     texture.CreatedAt,
		UpdatedAt:     texture.UpdatedAt,
	}))
}

// GetTexture 获取材质详情
// @Summary 获取材质详情
// @Description 根据ID获取材质详细信息
// @Tags texture
// @Accept json
// @Produce json
// @Param id path int true "材质ID"
// @Success 200 {object} model.Response "获取成功"
// @Failure 404 {object} model.ErrorResponse "材质不存在"
// @Router /api/v1/texture/{id} [get]
func GetTexture(c *gin.Context) {
	idStr := c.Param("id")
	id, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"无效的材质ID",
			err,
		))
		return
	}

	texture, err := service.GetTextureByID(database.MustGetDB(), id)
	if err != nil {
		c.JSON(http.StatusNotFound, model.NewErrorResponse(
			model.CodeNotFound,
			err.Error(),
			nil,
		))
		return
	}

	c.JSON(http.StatusOK, model.NewSuccessResponse(&types.TextureInfo{
		ID:            texture.ID,
		UploaderID:    texture.UploaderID,
		Name:          texture.Name,
		Description:   texture.Description,
		Type:          types.TextureType(texture.Type),
		URL:           texture.URL,
		Hash:          texture.Hash,
		Size:          texture.Size,
		IsPublic:      texture.IsPublic,
		DownloadCount: texture.DownloadCount,
		FavoriteCount: texture.FavoriteCount,
		IsSlim:        texture.IsSlim,
		Status:        texture.Status,
		CreatedAt:     texture.CreatedAt,
		UpdatedAt:     texture.UpdatedAt,
	}))
}

// SearchTextures 搜索材质
// @Summary 搜索材质
// @Description 根据关键词和类型搜索材质
// @Tags texture
// @Accept json
// @Produce json
// @Param keyword query string false "关键词"
// @Param type query string false "材质类型(SKIN/CAPE)"
// @Param public_only query bool false "只看公开材质"
// @Param page query int false "页码" default(1)
// @Param page_size query int false "每页数量" default(20)
// @Success 200 {object} model.PaginationResponse "搜索成功"
// @Router /api/v1/texture [get]
func SearchTextures(c *gin.Context) {
	keyword := c.Query("keyword")
	textureTypeStr := c.Query("type")
	publicOnly := c.Query("public_only") == "true"

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

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

	textures, total, err := service.SearchTextures(database.MustGetDB(), keyword, textureType, publicOnly, page, pageSize)
	if err != nil {
		logger.MustGetLogger().Error("搜索材质失败",
			zap.String("keyword", keyword),
			zap.Error(err),
		)
		c.JSON(http.StatusInternalServerError, model.NewErrorResponse(
			model.CodeServerError,
			"搜索材质失败",
			err,
		))
		return
	}

	// 转换为TextureInfo
	textureInfos := make([]*types.TextureInfo, len(textures))
	for i, texture := range textures {
		textureInfos[i] = &types.TextureInfo{
			ID:            texture.ID,
			UploaderID:    texture.UploaderID,
			Name:          texture.Name,
			Description:   texture.Description,
			Type:          types.TextureType(texture.Type),
			URL:           texture.URL,
			Hash:          texture.Hash,
			Size:          texture.Size,
			IsPublic:      texture.IsPublic,
			DownloadCount: texture.DownloadCount,
			FavoriteCount: texture.FavoriteCount,
			IsSlim:        texture.IsSlim,
			Status:        texture.Status,
			CreatedAt:     texture.CreatedAt,
			UpdatedAt:     texture.UpdatedAt,
		}
	}

	c.JSON(http.StatusOK, model.NewPaginationResponse(textureInfos, total, page, pageSize))
}

// UpdateTexture 更新材质
// @Summary 更新材质
// @Description 更新材质信息（仅上传者可操作）
// @Tags texture
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "材质ID"
// @Param request body types.UpdateTextureRequest true "更新材质请求"
// @Success 200 {object} model.Response "更新成功"
// @Failure 403 {object} model.ErrorResponse "无权操作"
// @Router /api/v1/texture/{id} [put]
func UpdateTexture(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, model.NewErrorResponse(
			model.CodeUnauthorized,
			model.MsgUnauthorized,
			nil,
		))
		return
	}

	idStr := c.Param("id")
	textureID, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"无效的材质ID",
			err,
		))
		return
	}

	var req types.UpdateTextureRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"请求参数错误",
			err,
		))
		return
	}

	texture, err := service.UpdateTexture(database.MustGetDB(), textureID, userID.(int64), req.Name, req.Description, req.IsPublic)
	if err != nil {
		logger.MustGetLogger().Error("更新材质失败",
			zap.Int64("user_id", userID.(int64)),
			zap.Int64("texture_id", textureID),
			zap.Error(err),
		)
		c.JSON(http.StatusForbidden, model.NewErrorResponse(
			model.CodeForbidden,
			err.Error(),
			nil,
		))
		return
	}

	c.JSON(http.StatusOK, model.NewSuccessResponse(&types.TextureInfo{
		ID:            texture.ID,
		UploaderID:    texture.UploaderID,
		Name:          texture.Name,
		Description:   texture.Description,
		Type:          types.TextureType(texture.Type),
		URL:           texture.URL,
		Hash:          texture.Hash,
		Size:          texture.Size,
		IsPublic:      texture.IsPublic,
		DownloadCount: texture.DownloadCount,
		FavoriteCount: texture.FavoriteCount,
		IsSlim:        texture.IsSlim,
		Status:        texture.Status,
		CreatedAt:     texture.CreatedAt,
		UpdatedAt:     texture.UpdatedAt,
	}))
}

// DeleteTexture 删除材质
// @Summary 删除材质
// @Description 删除材质（软删除，仅上传者可操作）
// @Tags texture
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "材质ID"
// @Success 200 {object} model.Response "删除成功"
// @Failure 403 {object} model.ErrorResponse "无权操作"
// @Router /api/v1/texture/{id} [delete]
func DeleteTexture(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, model.NewErrorResponse(
			model.CodeUnauthorized,
			model.MsgUnauthorized,
			nil,
		))
		return
	}

	idStr := c.Param("id")
	textureID, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"无效的材质ID",
			err,
		))
		return
	}

	if err := service.DeleteTexture(database.MustGetDB(), textureID, userID.(int64)); err != nil {
		logger.MustGetLogger().Error("删除材质失败",
			zap.Int64("user_id", userID.(int64)),
			zap.Int64("texture_id", textureID),
			zap.Error(err),
		)
		c.JSON(http.StatusForbidden, model.NewErrorResponse(
			model.CodeForbidden,
			err.Error(),
			nil,
		))
		return
	}

	c.JSON(http.StatusOK, model.NewSuccessResponse(nil))
}

// ToggleFavorite 切换收藏状态
// @Summary 切换收藏状态
// @Description 收藏或取消收藏材质
// @Tags texture
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param id path int true "材质ID"
// @Success 200 {object} model.Response "切换成功"
// @Router /api/v1/texture/{id}/favorite [post]
func ToggleFavorite(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, model.NewErrorResponse(
			model.CodeUnauthorized,
			model.MsgUnauthorized,
			nil,
		))
		return
	}

	idStr := c.Param("id")
	textureID, err := strconv.ParseInt(idStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"无效的材质ID",
			err,
		))
		return
	}

	isFavorited, err := service.ToggleTextureFavorite(database.MustGetDB(), userID.(int64), textureID)
	if err != nil {
		logger.MustGetLogger().Error("切换收藏状态失败",
			zap.Int64("user_id", userID.(int64)),
			zap.Int64("texture_id", textureID),
			zap.Error(err),
		)
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			err.Error(),
			nil,
		))
		return
	}

	c.JSON(http.StatusOK, model.NewSuccessResponse(map[string]bool{
		"is_favorited": isFavorited,
	}))
}

// GetUserTextures 获取用户上传的材质列表
// @Summary 获取用户上传的材质列表
// @Description 获取当前用户上传的所有材质
// @Tags texture
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param page query int false "页码" default(1)
// @Param page_size query int false "每页数量" default(20)
// @Success 200 {object} model.PaginationResponse "获取成功"
// @Router /api/v1/texture/my [get]
func GetUserTextures(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, model.NewErrorResponse(
			model.CodeUnauthorized,
			model.MsgUnauthorized,
			nil,
		))
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	textures, total, err := service.GetUserTextures(database.MustGetDB(), userID.(int64), page, pageSize)
	if err != nil {
		logger.MustGetLogger().Error("获取用户材质列表失败",
			zap.Int64("user_id", userID.(int64)),
			zap.Error(err),
		)
		c.JSON(http.StatusInternalServerError, model.NewErrorResponse(
			model.CodeServerError,
			"获取材质列表失败",
			err,
		))
		return
	}

	// 转换为TextureInfo
	textureInfos := make([]*types.TextureInfo, len(textures))
	for i, texture := range textures {
		textureInfos[i] = &types.TextureInfo{
			ID:            texture.ID,
			UploaderID:    texture.UploaderID,
			Name:          texture.Name,
			Description:   texture.Description,
			Type:          types.TextureType(texture.Type),
			URL:           texture.URL,
			Hash:          texture.Hash,
			Size:          texture.Size,
			IsPublic:      texture.IsPublic,
			DownloadCount: texture.DownloadCount,
			FavoriteCount: texture.FavoriteCount,
			IsSlim:        texture.IsSlim,
			Status:        texture.Status,
			CreatedAt:     texture.CreatedAt,
			UpdatedAt:     texture.UpdatedAt,
		}
	}

	c.JSON(http.StatusOK, model.NewPaginationResponse(textureInfos, total, page, pageSize))
}

// GetUserFavorites 获取用户收藏的材质列表
// @Summary 获取用户收藏的材质列表
// @Description 获取当前用户收藏的所有材质
// @Tags texture
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param page query int false "页码" default(1)
// @Param page_size query int false "每页数量" default(20)
// @Success 200 {object} model.PaginationResponse "获取成功"
// @Router /api/v1/texture/favorites [get]
func GetUserFavorites(c *gin.Context) {
	userID, exists := c.Get("user_id")
	if !exists {
		c.JSON(http.StatusUnauthorized, model.NewErrorResponse(
			model.CodeUnauthorized,
			model.MsgUnauthorized,
			nil,
		))
		return
	}

	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	textures, total, err := service.GetUserTextureFavorites(database.MustGetDB(), userID.(int64), page, pageSize)
	if err != nil {
		logger.MustGetLogger().Error("获取用户收藏列表失败",
			zap.Int64("user_id", userID.(int64)),
			zap.Error(err),
		)
		c.JSON(http.StatusInternalServerError, model.NewErrorResponse(
			model.CodeServerError,
			"获取收藏列表失败",
			err,
		))
		return
	}

	// 转换为TextureInfo
	textureInfos := make([]*types.TextureInfo, len(textures))
	for i, texture := range textures {
		textureInfos[i] = &types.TextureInfo{
			ID:            texture.ID,
			UploaderID:    texture.UploaderID,
			Name:          texture.Name,
			Description:   texture.Description,
			Type:          types.TextureType(texture.Type),
			URL:           texture.URL,
			Hash:          texture.Hash,
			Size:          texture.Size,
			IsPublic:      texture.IsPublic,
			DownloadCount: texture.DownloadCount,
			FavoriteCount: texture.FavoriteCount,
			IsSlim:        texture.IsSlim,
			Status:        texture.Status,
			CreatedAt:     texture.CreatedAt,
			UpdatedAt:     texture.UpdatedAt,
		}
	}

	c.JSON(http.StatusOK, model.NewPaginationResponse(textureInfos, total, page, pageSize))
}