package models

import (
	"errors"
	"strings"
	"time"

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

// User represents a system user
type User struct {
	gorm.Model
	FirstName    string    `json:"first_name" gorm:"not null;size:100" validate:"required,min=2,max=100"`
	LastName     string    `json:"last_name" gorm:"not null;size:100" validate:"required,min=2,max=100"`
	Email        string    `json:"email" gorm:"unique;not null;size:255" validate:"required,email"`
	Phone        string    `json:"phone" gorm:"size:20" validate:"omitempty,min=10,max=20"`
	Location     string    `json:"location" gorm:"size:255" validate:"omitempty,max=255"`
	DateOfBirth  time.Time `json:"date_of_birth" validate:"omitempty"`
	PasswordHash string    `json:"-" gorm:"not null;size:255"`
	IsAdmin      bool      `json:"is_admin" gorm:"default:false"`
	Bookings     []Booking `json:"bookings" gorm:"foreignKey:UserID"`
}

// HashPassword hashes the user's password using bcrypt
func (u *User) HashPassword(password string) error {
	if len(password) < 8 {
		return errors.New("password must be at least 8 characters long")
	}

	hashedBytes, err := bcrypt.GenerateFromPassword([]byte(password), bcrypt.DefaultCost)
	if err != nil {
		return err
	}

	u.PasswordHash = string(hashedBytes)
	return nil
}

// CheckPassword verifies if the provided password matches the user's hashed password
func (u *User) CheckPassword(password string) bool {
	err := bcrypt.CompareHashAndPassword([]byte(u.PasswordHash), []byte(password))
	return err == nil
}

// BeforeCreate is a GORM hook that runs before creating a user record
func (u *User) BeforeCreate(tx *gorm.DB) error {
	// Ensure email is lowercase for consistency
	u.Email = strings.ToLower(u.Email)
	return nil
}