package handler

import (
	"net/http"
	"strconv"

	"carrotskin/internal/container"
	"carrotskin/internal/model"

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

// AdminHandler 管理员处理器
type AdminHandler struct {
	container *container.Container
}

// NewAdminHandler 创建管理员处理器
func NewAdminHandler(c *container.Container) *AdminHandler {
	return &AdminHandler{container: c}
}

// SetUserRoleRequest 设置用户角色请求
type SetUserRoleRequest struct {
	UserID int64  `json:"user_id" binding:"required"`
	Role   string `json:"role" binding:"required,oneof=user admin"`
}

// SetUserRole 设置用户角色
// @Summary 设置用户角色
// @Description 管理员设置指定用户的角色
// @Tags Admin
// @Accept json
// @Produce json
// @Param request body SetUserRoleRequest true "设置角色请求"
// @Success 200 {object} model.Response
// @Failure 400 {object} model.Response
// @Failure 403 {object} model.Response
// @Security BearerAuth
// @Router /admin/users/role [put]
func (h *AdminHandler) SetUserRole(c *gin.Context) {
	var req SetUserRoleRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		RespondBadRequest(c, "参数错误", err)
		return
	}

	// 获取当前操作者ID
	operatorID, _ := c.Get("user_id")

	// 不能修改自己的角色
	if req.UserID == operatorID.(int64) {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"不能修改自己的角色",
			nil,
		))
		return
	}

	// 检查目标用户是否存在
	targetUser, err := h.container.UserRepo.FindByID(c.Request.Context(), req.UserID)
	if err != nil || targetUser == nil {
		c.JSON(http.StatusNotFound, model.NewErrorResponse(
			model.CodeNotFound,
			"用户不存在",
			nil,
		))
		return
	}

	// 更新用户角色
	err = h.container.UserRepo.UpdateFields(c.Request.Context(), req.UserID, map[string]interface{}{
		"role": req.Role,
	})
	if err != nil {
		RespondServerError(c, "更新用户角色失败", err)
		return
	}

	h.container.Logger.Info("管理员修改用户角色",
		zap.Int64("operator_id", operatorID.(int64)),
		zap.Int64("target_user_id", req.UserID),
		zap.String("new_role", req.Role),
	)

	c.JSON(http.StatusOK, model.NewSuccessResponse(gin.H{
		"message": "用户角色更新成功",
		"user_id": req.UserID,
		"role":    req.Role,
	}))
}

// GetUserList 获取用户列表
// @Summary 获取用户列表
// @Description 管理员获取所有用户列表
// @Tags Admin
// @Produce json
// @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.Response
// @Failure 403 {object} model.Response
// @Security BearerAuth
// @Router /admin/users [get]
func (h *AdminHandler) GetUserList(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 100 {
		pageSize = 20
	}

	// 使用数据库直接查询用户列表
	var users []model.User
	var total int64

	db := h.container.DB
	db.Model(&model.User{}).Count(&total)
	db.Offset((page - 1) * pageSize).Limit(pageSize).Order("id DESC").Find(&users)

	// 构建响应（隐藏敏感信息）
	userList := make([]gin.H, len(users))
	for i, u := range users {
		userList[i] = gin.H{
			"id":            u.ID,
			"username":      u.Username,
			"email":         u.Email,
			"avatar":        u.Avatar,
			"role":          u.Role,
			"status":        u.Status,
			"points":        u.Points,
			"last_login_at": u.LastLoginAt,
			"created_at":    u.CreatedAt,
		}
	}

	c.JSON(http.StatusOK, model.NewSuccessResponse(gin.H{
		"users":     userList,
		"total":     total,
		"page":      page,
		"page_size": pageSize,
	}))
}

// GetUserDetail 获取用户详情
// @Summary 获取用户详情
// @Description 管理员获取指定用户的详细信息
// @Tags Admin
// @Produce json
// @Param id path int true "用户ID"
// @Success 200 {object} model.Response
// @Failure 404 {object} model.Response
// @Security BearerAuth
// @Router /admin/users/{id} [get]
func (h *AdminHandler) GetUserDetail(c *gin.Context) {
	userID, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		RespondBadRequest(c, "无效的用户ID", err)
		return
	}

	user, err := h.container.UserRepo.FindByID(c.Request.Context(), userID)
	if err != nil || user == nil {
		c.JSON(http.StatusNotFound, model.NewErrorResponse(
			model.CodeNotFound,
			"用户不存在",
			nil,
		))
		return
	}

	c.JSON(http.StatusOK, model.NewSuccessResponse(gin.H{
		"id":            user.ID,
		"username":      user.Username,
		"email":         user.Email,
		"avatar":        user.Avatar,
		"role":          user.Role,
		"status":        user.Status,
		"points":        user.Points,
		"properties":    user.Properties,
		"last_login_at": user.LastLoginAt,
		"created_at":    user.CreatedAt,
		"updated_at":    user.UpdatedAt,
	}))
}

// SetUserStatusRequest 设置用户状态请求
type SetUserStatusRequest struct {
	UserID int64 `json:"user_id" binding:"required"`
	Status int16 `json:"status" binding:"required,oneof=1 0 -1"` // 1:正常, 0:禁用, -1:删除
}

// SetUserStatus 设置用户状态
// @Summary 设置用户状态
// @Description 管理员设置用户状态（启用/禁用）
// @Tags Admin
// @Accept json
// @Produce json
// @Param request body SetUserStatusRequest true "设置状态请求"
// @Success 200 {object} model.Response
// @Failure 400 {object} model.Response
// @Security BearerAuth
// @Router /admin/users/status [put]
func (h *AdminHandler) SetUserStatus(c *gin.Context) {
	var req SetUserStatusRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		RespondBadRequest(c, "参数错误", err)
		return
	}

	operatorID, _ := c.Get("user_id")

	// 不能修改自己的状态
	if req.UserID == operatorID.(int64) {
		c.JSON(http.StatusBadRequest, model.NewErrorResponse(
			model.CodeBadRequest,
			"不能修改自己的状态",
			nil,
		))
		return
	}

	// 检查目标用户是否存在
	targetUser, err := h.container.UserRepo.FindByID(c.Request.Context(), req.UserID)
	if err != nil || targetUser == nil {
		c.JSON(http.StatusNotFound, model.NewErrorResponse(
			model.CodeNotFound,
			"用户不存在",
			nil,
		))
		return
	}

	// 更新用户状态
	err = h.container.UserRepo.UpdateFields(c.Request.Context(), req.UserID, map[string]interface{}{
		"status": req.Status,
	})
	if err != nil {
		RespondServerError(c, "更新用户状态失败", err)
		return
	}

	statusText := map[int16]string{1: "正常", 0: "禁用", -1: "删除"}[req.Status]

	h.container.Logger.Info("管理员修改用户状态",
		zap.Int64("operator_id", operatorID.(int64)),
		zap.Int64("target_user_id", req.UserID),
		zap.Int16("new_status", req.Status),
	)

	c.JSON(http.StatusOK, model.NewSuccessResponse(gin.H{
		"message":     "用户状态更新成功",
		"user_id":     req.UserID,
		"status":      req.Status,
		"status_text": statusText,
	}))
}

// DeleteTexture 管理员删除材质
// @Summary 管理员删除材质
// @Description 管理员可以删除任意材质（用于审核不当内容）
// @Tags Admin
// @Produce json
// @Param id path int true "材质ID"
// @Success 200 {object} model.Response
// @Failure 404 {object} model.Response
// @Security BearerAuth
// @Router /admin/textures/{id} [delete]
func (h *AdminHandler) DeleteTexture(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
	}

	operatorID, _ := c.Get("user_id")

	// 检查材质是否存在
	var texture model.Texture
	if err := h.container.DB.First(&texture, textureID).Error; err != nil {
		c.JSON(http.StatusNotFound, model.NewErrorResponse(
			model.CodeNotFound,
			"材质不存在",
			nil,
		))
		return
	}

	// 删除材质
	if err := h.container.DB.Delete(&texture).Error; err != nil {
		RespondServerError(c, "删除材质失败", err)
		return
	}

	h.container.Logger.Info("管理员删除材质",
		zap.Int64("operator_id", operatorID.(int64)),
		zap.Int64("texture_id", textureID),
		zap.Int64("uploader_id", texture.UploaderID),
		zap.String("texture_name", texture.Name),
	)

	c.JSON(http.StatusOK, model.NewSuccessResponse(gin.H{
		"message":    "材质删除成功",
		"texture_id": textureID,
	}))
}

// GetTextureList 管理员获取材质列表
// @Summary 管理员获取材质列表
// @Description 管理员获取所有材质列表（用于审核）
// @Tags Admin
// @Produce json
// @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.Response
// @Security BearerAuth
// @Router /admin/textures [get]
func (h *AdminHandler) GetTextureList(c *gin.Context) {
	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))

	if page < 1 {
		page = 1
	}
	if pageSize < 1 || pageSize > 100 {
		pageSize = 20
	}

	var textures []model.Texture
	var total int64

	db := h.container.DB
	db.Model(&model.Texture{}).Count(&total)
	db.Preload("Uploader").Offset((page - 1) * pageSize).Limit(pageSize).Order("id DESC").Find(&textures)

	// 构建响应
	textureList := make([]gin.H, len(textures))
	for i, t := range textures {
		uploaderName := ""
		if t.Uploader != nil {
			uploaderName = t.Uploader.Username
		}
		textureList[i] = gin.H{
			"id":             t.ID,
			"name":           t.Name,
			"type":           t.Type,
			"hash":           t.Hash,
			"uploader_id":    t.UploaderID,
			"uploader_name":  uploaderName,
			"is_public":      t.IsPublic,
			"download_count": t.DownloadCount,
			"created_at":     t.CreatedAt,
		}
	}

	c.JSON(http.StatusOK, model.NewSuccessResponse(gin.H{
		"textures":  textureList,
		"total":     total,
		"page":      page,
		"page_size": pageSize,
	}))
}