package domain

import (
	"backend/pkg/validate/national"
	"backend/pkg/validate/phone"
	"context"
	"errors"
	"time"

	"net/mail"

	"github.com/ethereum/go-ethereum/common"
	"github.com/google/uuid"
)

var (
	ErrPhoneInvalid      = errors.New("phone number is invalid")
	ErrUserNotFound      = errors.New("user not found")
	ErrNationalIDInvalid = errors.New("national ID is invalid")
	ErrWalletInvalid     = errors.New("wallet address is invalid")
	ErrEmailInvalid      = errors.New("email is invalid")
)

type UserRepo interface {
	Create(ctx context.Context, user *User) error
	GetByID(ctx context.Context, id uuid.UUID) (*User, error)
	GetByPhone(ctx context.Context, phone string) (*User, error)
	Update(ctx context.Context, user *User) error
	Delete(ctx context.Context, id uuid.UUID) error
}

type User struct {
	ID     uuid.UUID
	PubKey string
	Name   string
	//TODO: add Kyc Embedded struct
	//TODO: add NFT Embedded struct
	LastName    string
	PhoneNumber string
	Email       *string
	NationalID  string
	BirthDate   *time.Time
	LastLogin   *time.Time
	CreatedAt   time.Time
	UpdatedAt   time.Time
	DeletedAt   *time.Time
}

// TODO: move to another file?
type Challenge struct {
	Message   uuid.UUID
	TimeStamp time.Time
	ExpiresAt time.Time
}

// TODO: check EIP712 in here for challenge validation
func (c *Challenge) IsExpired() bool {
	return time.Now().After(c.ExpiresAt)
}

func NewUser(pubKey, name, lastName, phoneNumber, email, nationalID string) (*User, error) {

	_, err := phone.IsValid(phoneNumber)
	if err != nil {
		return nil, ErrPhoneInvalid
	}

	_, err = national.IsValid(nationalID)
	if err != nil {
		return nil, ErrNationalIDInvalid
	}

	if !common.IsHexAddress(pubKey) {
		return nil, ErrWalletInvalid
	}

	return &User{
		ID:          uuid.New(),
		PubKey:      pubKey,
		Name:        name,
		LastName:    lastName,
		PhoneNumber: phoneNumber,
		NationalID:  nationalID,
		CreatedAt:   time.Now().UTC(),
		UpdatedAt:   time.Now().UTC(),
	}, nil
}

func (u *User) UpdateLastLogin() {
	now := time.Now().UTC()
	u.LastLogin = &now
	u.UpdatedAt = now
}

func (u *User) UpdateInfo(email string) {
	addr, err := mail.ParseAddress(email)
	if err == nil {
		u.Email = &addr.Address
	}
	u.UpdatedAt = time.Now().UTC()
}