package service

import (
	"context"
	"errors"

	"gitee.com/kedaya_mp/user/biz/dal/db"
	"gitee.com/kedaya_mp/user/biz/model/common"
	"gitee.com/kedaya_mp/user/pkg/captcha"
	"gitee.com/kedaya_mp/user/pkg/crypto"
	"github.com/ArtisanCloud/PowerWeChat/v3/src/miniProgram"
	"gorm.io/gorm"
)

var (
	ErrUserNotFound     = errors.New("用户不存在")
	ErrInvalidPassword  = errors.New("密码错误")
	ErrGetWXUserInfo    = errors.New("获取微信用户信息失败")
	ErrCreateUserFailed = errors.New("创建用户失败")
)

type UserService struct {
	store          db.UserStore
	miniProgramApp *miniProgram.MiniProgram
	captchaService captcha.Service
}

func NewUserService(_db *gorm.DB, miniProgramApp *miniProgram.MiniProgram, captchaService captcha.Service) *UserService {
	return &UserService{
		store:          db.NewUserStore(_db),
		miniProgramApp: miniProgramApp,
		captchaService: captchaService,
	}
}

func (s *UserService) Init() error {
	if err := s.store.AutoMigrate(); err != nil {
		return err
	}
	return nil
}

func (s *UserService) LoginByPhone(phone, password string) (*common.User, error) {
	user, err := s.store.Find(&db.FindUserQuery{Phone: phone})
	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, err
	}

	if user == nil {
		hashedPassword := crypto.HashPassword(password)
		newUser := &common.User{
			Phone:    phone,
			Password: hashedPassword,
		}

		user, err = s.store.Create(newUser)
		if err != nil {
			return nil, ErrCreateUserFailed
		}
		return user, nil
	}

	if !crypto.VerifyPassword(password, user.Password) {
		return nil, ErrInvalidPassword
	}

	return user, nil
}

func (s *UserService) LoginByWechat(ctx context.Context, wxCode, phone string) (*common.User, error) {
	authResult, err := s.miniProgramApp.Auth.Session(ctx, wxCode)
	if err != nil {
		return nil, ErrGetWXUserInfo
	}

	user, err := s.store.Find(&db.FindUserQuery{WxUnionID: authResult.UnionID})
	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, err
	}

	if user != nil {
		if user.Phone != phone {
			return nil, errors.New("手机号与已绑定的不符")
		}
		user.WxSession = authResult.SessionKey
		if err = s.store.Update(user, "wx_session"); err != nil {
			return nil, err
		}
		return user, nil
	}

	newUser := &common.User{
		Phone:     phone,
		WxUnionID: authResult.UnionID,
	}

	user, err = s.store.Create(newUser)
	if err != nil {
		return nil, ErrCreateUserFailed
	}

	return user, nil
}

func (s *UserService) LoginByPhoneAndCode(ctx context.Context, phone, captchaCode string) (*common.User, error) {
	if err := s.captchaService.VerifyCode(ctx, phone, captchaCode); err != nil {
		return nil, err
	}

	user, err := s.store.Find(&db.FindUserQuery{Phone: phone})
	if err != nil && !errors.Is(err, gorm.ErrRecordNotFound) {
		return nil, err
	}

	if user == nil {
		newUser := &common.User{
			Phone: phone,
		}
		user, err = s.store.Create(newUser)
		if err != nil {
			return nil, ErrCreateUserFailed
		}
	}
	return user, nil
}

func (s *UserService) Login(ctx context.Context, phone, password, wxCode, captcha string) (*common.User, error) {
	if phone == "" {
		return nil, errors.New("手机号不能为空")
	}

	if wxCode != "" {
		return s.LoginByWechat(ctx, wxCode, phone)
	}

	if captcha != "" {
		return s.LoginByPhoneAndCode(ctx, phone, captcha)
	}

	if password == "" {
		return nil, errors.New("密码不能为空")
	}
	return s.LoginByPhone(phone, password)
}

func (s *UserService) GetUserByPhone(phone string) (*common.User, error) {
	user, err := s.store.Find(&db.FindUserQuery{Phone: phone}, "created_at", "nick_name", "phone", "avatar", "gender")
	if err != nil {
		return nil, err
	}
	if user == nil {
		return nil, ErrUserNotFound
	}
	return user, nil
}