package handler

import (
	"carrotskin/internal/service"
	"carrotskin/internal/types"
	"carrotskin/pkg/config"
	"carrotskin/pkg/database"
	"carrotskin/pkg/logger"
	"carrotskin/pkg/redis"
	"carrotskin/pkg/storage"

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

// GetUserProfile 获取用户信息
// @Summary 获取用户信息
// @Description 获取当前登录用户的详细信息
// @Tags user
// @Accept json
// @Produce json
// @Security BearerAuth
// @Success 200 {object} model.Response "获取成功"
// @Failure 401 {object} model.ErrorResponse "未授权"
// @Router /api/v1/user/profile [get]
func GetUserProfile(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	user, err := service.GetUserByID(userID)
	if err != nil || user == nil {
		logger.MustGetLogger().Error("获取用户信息失败",
			zap.Int64("user_id", userID),
			zap.Error(err),
		)
		RespondNotFound(c, "用户不存在")
		return
	}

	RespondSuccess(c, UserToUserInfo(user))
}

// UpdateUserProfile 更新用户信息
// @Summary 更新用户信息
// @Description 更新当前登录用户的头像和密码（修改邮箱请使用 /change-email 接口）
// @Tags user
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param request body types.UpdateUserRequest true "更新信息（修改密码时需同时提供old_password和new_password）"
// @Success 200 {object} model.Response{data=types.UserInfo} "更新成功"
// @Failure 400 {object} model.ErrorResponse "请求参数错误"
// @Failure 401 {object} model.ErrorResponse "未授权"
// @Failure 404 {object} model.ErrorResponse "用户不存在"
// @Failure 500 {object} model.ErrorResponse "服务器错误"
// @Router /api/v1/user/profile [put]
func UpdateUserProfile(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

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

	user, err := service.GetUserByID(userID)
	if err != nil || user == nil {
		RespondNotFound(c, "用户不存在")
		return
	}

	// 处理密码修改
	if req.NewPassword != "" {
		if req.OldPassword == "" {
			RespondBadRequest(c, "修改密码需要提供原密码", nil)
			return
		}

		if err := service.ChangeUserPassword(userID, req.OldPassword, req.NewPassword); err != nil {
			loggerInstance.Error("修改密码失败", zap.Int64("user_id", userID), zap.Error(err))
			RespondBadRequest(c, err.Error(), nil)
			return
		}

		loggerInstance.Info("用户修改密码成功", zap.Int64("user_id", userID))
	}

	// 更新头像
	if req.Avatar != "" {
		// 验证头像 URL 是否来自允许的域名
		if err := service.ValidateAvatarURL(req.Avatar); err != nil {
			RespondBadRequest(c, err.Error(), nil)
			return
		}
		user.Avatar = req.Avatar
		if err := service.UpdateUserInfo(user); err != nil {
			loggerInstance.Error("更新用户信息失败", zap.Int64("user_id", user.ID), zap.Error(err))
			RespondServerError(c, "更新失败", err)
			return
		}
	}

	// 重新获取更新后的用户信息
	updatedUser, err := service.GetUserByID(userID)
	if err != nil || updatedUser == nil {
		RespondNotFound(c, "用户不存在")
		return
	}

	RespondSuccess(c, UserToUserInfo(updatedUser))
}

// GenerateAvatarUploadURL 生成头像上传URL
// @Summary 生成头像上传URL
// @Description 生成预签名URL用于上传用户头像
// @Tags user
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param request body types.GenerateAvatarUploadURLRequest true "文件名"
// @Success 200 {object} model.Response "生成成功"
// @Failure 400 {object} model.ErrorResponse "请求参数错误"
// @Router /api/v1/user/avatar/upload-url [post]
func GenerateAvatarUploadURL(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

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

	storageClient := storage.MustGetClient()
	cfg := *config.MustGetRustFSConfig()
	result, err := service.GenerateAvatarUploadURL(c.Request.Context(), storageClient, cfg, userID, req.FileName)
	if err != nil {
		logger.MustGetLogger().Error("生成头像上传URL失败",
			zap.Int64("user_id", userID),
			zap.String("file_name", req.FileName),
			zap.Error(err),
		)
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	RespondSuccess(c, &types.GenerateAvatarUploadURLResponse{
		PostURL:   result.PostURL,
		FormData:  result.FormData,
		AvatarURL: result.FileURL,
		ExpiresIn: 900,
	})
}

// UpdateAvatar 更新头像URL
// @Summary 更新头像URL
// @Description 上传完成后更新用户的头像URL到数据库
// @Tags user
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param avatar_url query string true "头像URL"
// @Success 200 {object} model.Response "更新成功"
// @Failure 400 {object} model.ErrorResponse "请求参数错误"
// @Router /api/v1/user/avatar [put]
func UpdateAvatar(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	avatarURL := c.Query("avatar_url")
	if avatarURL == "" {
		RespondBadRequest(c, "头像URL不能为空", nil)
		return
	}

	if err := service.ValidateAvatarURL(avatarURL); err != nil {
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	if err := service.UpdateUserAvatar(userID, avatarURL); err != nil {
		logger.MustGetLogger().Error("更新头像失败",
			zap.Int64("user_id", userID),
			zap.String("avatar_url", avatarURL),
			zap.Error(err),
		)
		RespondServerError(c, "更新头像失败", err)
		return
	}

	user, err := service.GetUserByID(userID)
	if err != nil || user == nil {
		RespondNotFound(c, "用户不存在")
		return
	}

	RespondSuccess(c, UserToUserInfo(user))
}

// ChangeEmail 更换邮箱
// @Summary 更换邮箱
// @Description 通过验证码更换用户邮箱
// @Tags user
// @Accept json
// @Produce json
// @Security BearerAuth
// @Param request body types.ChangeEmailRequest true "更换邮箱请求"
// @Success 200 {object} model.Response{data=types.UserInfo} "更换成功"
// @Failure 400 {object} model.ErrorResponse "请求参数错误"
// @Failure 401 {object} model.ErrorResponse "未授权"
// @Router /api/v1/user/change-email [post]
func ChangeEmail(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

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

	redisClient := redis.MustGetClient()
	if err := service.VerifyCode(c.Request.Context(), redisClient, req.NewEmail, req.VerificationCode, service.VerificationTypeChangeEmail); err != nil {
		loggerInstance.Warn("验证码验证失败", zap.String("new_email", req.NewEmail), zap.Error(err))
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	if err := service.ChangeUserEmail(userID, req.NewEmail); err != nil {
		loggerInstance.Error("更换邮箱失败",
			zap.Int64("user_id", userID),
			zap.String("new_email", req.NewEmail),
			zap.Error(err),
		)
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	user, err := service.GetUserByID(userID)
	if err != nil || user == nil {
		RespondNotFound(c, "用户不存在")
		return
	}

	RespondSuccess(c, UserToUserInfo(user))
}

// ResetYggdrasilPassword 重置Yggdrasil密码
// @Summary 重置Yggdrasil密码
// @Description 重置当前用户的Yggdrasil密码并返回新密码
// @Tags user
// @Accept json
// @Produce json
// @Security BearerAuth
// @Success 200 {object} model.Response "重置成功"
// @Failure 401 {object} model.ErrorResponse "未授权"
// @Failure 500 {object} model.ErrorResponse "服务器错误"
// @Router /api/v1/user/yggdrasil-password/reset [post]
func ResetYggdrasilPassword(c *gin.Context) {
	loggerInstance := logger.MustGetLogger()
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	db := database.MustGetDB()
	newPassword, err := service.ResetYggdrasilPassword(db, userID)
	if err != nil {
		loggerInstance.Error("重置Yggdrasil密码失败", zap.Error(err), zap.Int64("userId", userID))
		RespondServerError(c, "重置Yggdrasil密码失败", nil)
		return
	}

	loggerInstance.Info("Yggdrasil密码重置成功", zap.Int64("userId", userID))
	RespondSuccess(c, gin.H{"password": newPassword})
}