package service

import (
	"errors"

	"affiliate_dash/internal/model"
	"affiliate_dash/internal/pkg/jwt"

	"golang.org/x/crypto/bcrypt"
	"gorm.io/gorm"
)

type AuthService struct {
	db     *gorm.DB
	jwt    *jwt.Manager
	tenant *TenantService
}

func NewAuthService(db *gorm.DB, jm *jwt.Manager, tenant *TenantService) *AuthService {
	return &AuthService{db: db, jwt: jm, tenant: tenant}
}

type LoginResult struct {
	Token string      `json:"token"`
	User  *model.User `json:"user"`
}

func (s *AuthService) Login(username, password string) (*LoginResult, error) {
	var user model.User
	if err := s.db.Where("username = ?", username).First(&user).Error; err != nil {
		if errors.Is(err, gorm.ErrRecordNotFound) {
			return nil, errors.New("用户名或密码错误")
		}
		return nil, err
	}
	if user.Status != 1 {
		return nil, errors.New("账号已禁用")
	}
	if err := bcrypt.CompareHashAndPassword([]byte(user.PasswordHash), []byte(password)); err != nil {
		return nil, errors.New("用户名或密码错误")
	}
	token, err := s.jwt.Generate(user.ID, user.Username, user.Role)
	if err != nil {
		return nil, err
	}
	return &LoginResult{Token: token, User: &user}, nil
}

func (s *AuthService) GetProfile(userID uint) (*model.User, error) {
	var user model.User
	if err := s.db.First(&user, userID).Error; err != nil {
		return nil, err
	}
	return &user, nil
}

func (s *AuthService) EnsureAdmin() error {
	var count int64
	s.db.Model(&model.User{}).Where("role = ?", model.RoleAdmin).Count(&count)
	if count > 0 {
		if s.tenant != nil {
			var admins []model.User
			if err := s.db.Where("role = ?", model.RoleAdmin).Find(&admins).Error; err != nil {
				return err
			}
			for _, admin := range admins {
				if err := s.tenant.EnsureSelfMember(admin.ID, model.MemberRoleOwner, admin.Status); err != nil {
					return err
				}
			}
		}
		return nil
	}
	hash, err := bcrypt.GenerateFromPassword([]byte("admin123"), bcrypt.DefaultCost)
	if err != nil {
		return err
	}
	admin := &model.User{
		Username:     "admin",
		PasswordHash: string(hash),
		Nickname:     "管理员",
		Role:         model.RoleAdmin,
		Status:       1,
	}
	if err := s.db.Create(admin).Error; err != nil {
		return err
	}
	if s.tenant != nil {
		return s.tenant.EnsureSelfMember(admin.ID, model.MemberRoleOwner, admin.Status)
	}
	return nil
}