package admin

import (
	"github.com/break/junhong_cmp_fiber/internal/model"
	"github.com/break/junhong_cmp_fiber/internal/service/auth"
	"github.com/break/junhong_cmp_fiber/pkg/errors"
	"github.com/break/junhong_cmp_fiber/pkg/middleware"
	"github.com/break/junhong_cmp_fiber/pkg/response"
	"github.com/go-playground/validator/v10"
	"github.com/gofiber/fiber/v2"
)

// AuthHandler 后台认证处理器
type AuthHandler struct {
	authService *auth.Service
	validator   *validator.Validate
}

// NewAuthHandler 创建后台认证处理器
func NewAuthHandler(authService *auth.Service, validator *validator.Validate) *AuthHandler {
	return &AuthHandler{
		authService: authService,
		validator:   validator,
	}
}

// Login 后台登录
func (h *AuthHandler) Login(c *fiber.Ctx) error {
	var req model.LoginRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}

	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "参数验证失败: "+err.Error())
	}

	clientIP := c.IP()
	ctx := c.UserContext()

	resp, err := h.authService.Login(ctx, &req, clientIP)
	if err != nil {
		return err
	}

	return response.Success(c, resp)
}

// Logout 后台登出
func (h *AuthHandler) Logout(c *fiber.Ctx) error {
	auth := c.Get("Authorization")
	accessToken := ""
	if len(auth) > 7 && auth[:7] == "Bearer " {
		accessToken = auth[7:]
	}

	refreshToken := ""
	var req model.RefreshTokenRequest
	if err := c.BodyParser(&req); err == nil {
		refreshToken = req.RefreshToken
	}

	ctx := c.UserContext()

	if err := h.authService.Logout(ctx, accessToken, refreshToken); err != nil {
		return err
	}

	return response.Success(c, nil)
}

// RefreshToken 刷新访问令牌
func (h *AuthHandler) RefreshToken(c *fiber.Ctx) error {
	var req model.RefreshTokenRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}

	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "参数验证失败: "+err.Error())
	}

	ctx := c.UserContext()

	newAccessToken, err := h.authService.RefreshToken(ctx, req.RefreshToken)
	if err != nil {
		return err
	}

	resp := &model.RefreshTokenResponse{
		AccessToken: newAccessToken,
		ExpiresIn:   86400,
	}

	return response.Success(c, resp)
}

// GetMe 获取当前用户信息
func (h *AuthHandler) GetMe(c *fiber.Ctx) error {
	userID := middleware.GetUserIDFromContext(c.UserContext())
	if userID == 0 {
		return errors.New(errors.CodeUnauthorized, "未授权访问")
	}

	ctx := c.UserContext()

	userInfo, permissions, err := h.authService.GetCurrentUser(ctx, userID)
	if err != nil {
		return err
	}

	data := map[string]interface{}{
		"user":        userInfo,
		"permissions": permissions,
	}

	return response.Success(c, data)
}

// ChangePassword 修改密码
func (h *AuthHandler) ChangePassword(c *fiber.Ctx) error {
	userID := middleware.GetUserIDFromContext(c.UserContext())
	if userID == 0 {
		return errors.New(errors.CodeUnauthorized, "未授权访问")
	}

	var req model.ChangePasswordRequest
	if err := c.BodyParser(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "请求参数解析失败")
	}

	if err := h.validator.Struct(&req); err != nil {
		return errors.New(errors.CodeInvalidParam, "参数验证失败: "+err.Error())
	}

	ctx := c.UserContext()

	if err := h.authService.ChangePassword(ctx, userID, req.OldPassword, req.NewPassword); err != nil {
		return err
	}

	return response.Success(c, nil)
}