package handler

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

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

// UserHandler 用户处理器（依赖注入版本）
type UserHandler struct {
	container *container.Container
	logger    *zap.Logger
}

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

// GetProfile 获取用户信息
func (h *UserHandler) GetProfile(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	user, err := h.container.UserService.GetByID(c.Request.Context(), userID)
	if err != nil || user == nil {
		h.logger.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))
}

// UpdateProfile 更新用户信息
func (h *UserHandler) UpdateProfile(c *gin.Context) {
	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 := h.container.UserService.GetByID(c.Request.Context(), 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 := h.container.UserService.ChangePassword(c.Request.Context(), userID, req.OldPassword, req.NewPassword); err != nil {
			h.logger.Error("修改密码失败", zap.Int64("user_id", userID), zap.Error(err))
			RespondBadRequest(c, err.Error(), nil)
			return
		}

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

	// 更新头像
	if req.Avatar != "" {
		if err := h.container.UserService.ValidateAvatarURL(c.Request.Context(), req.Avatar); err != nil {
			RespondBadRequest(c, err.Error(), nil)
			return
		}
		user.Avatar = req.Avatar
		if err := h.container.UserService.UpdateInfo(c.Request.Context(), user); err != nil {
			h.logger.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 := h.container.UserService.GetByID(c.Request.Context(), userID)
	if err != nil || updatedUser == nil {
		RespondNotFound(c, "用户不存在")
		return
	}

	RespondSuccess(c, UserToUserInfo(updatedUser))
}

// UploadAvatar 直接上传头像文件
func (h *UserHandler) UploadAvatar(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	// 解析multipart表单
	if err := c.Request.ParseMultipartForm(10 << 20); err != nil { // 10MB
		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
	}

	// 调用服务上传头像
	avatarURL, err := h.container.UserService.UploadAvatar(c.Request.Context(), userID, fileData, file.Filename)
	if err != nil {
		h.logger.Error("上传头像失败",
			zap.Int64("user_id", userID),
			zap.String("file_name", file.Filename),
			zap.Error(err),
		)
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	// 获取更新后的用户信息
	user, err := h.container.UserService.GetByID(c.Request.Context(), userID)
	if err != nil || user == nil {
		RespondNotFound(c, "用户不存在")
		return
	}

	RespondSuccess(c, gin.H{
		"avatar_url": avatarURL,
		"user":       UserToUserInfo(user),
	})
}

// UpdateAvatar 更新头像URL（保留用于外部URL）
func (h *UserHandler) 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 := h.container.UserService.ValidateAvatarURL(c.Request.Context(), avatarURL); err != nil {
		RespondBadRequest(c, err.Error(), nil)
		return
	}

	if err := h.container.UserService.UpdateAvatar(c.Request.Context(), userID, avatarURL); err != nil {
		h.logger.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 := h.container.UserService.GetByID(c.Request.Context(), userID)
	if err != nil || user == nil {
		RespondNotFound(c, "用户不存在")
		return
	}

	RespondSuccess(c, UserToUserInfo(user))
}

// ChangeEmail 更换邮箱
func (h *UserHandler) ChangeEmail(c *gin.Context) {
	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
	}

	if err := h.container.VerificationService.VerifyCode(c.Request.Context(), req.NewEmail, req.VerificationCode, service.VerificationTypeChangeEmail); err != nil {
		h.logger.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 := h.container.UserService.ChangeEmail(c.Request.Context(), userID, req.NewEmail); err != nil {
		h.logger.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 := h.container.UserService.GetByID(c.Request.Context(), userID)
	if err != nil || user == nil {
		RespondNotFound(c, "用户不存在")
		return
	}

	RespondSuccess(c, UserToUserInfo(user))
}

// ResetYggdrasilPassword 重置Yggdrasil密码
func (h *UserHandler) ResetYggdrasilPassword(c *gin.Context) {
	userID, ok := GetUserIDFromContext(c)
	if !ok {
		return
	}

	newPassword, err := h.container.YggdrasilService.ResetYggdrasilPassword(c.Request.Context(), userID)
	if err != nil {
		h.logger.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
	}

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