package domain

import (
	"errors"
	"time"
)

var (
	ErrUserNotVerified        = errors.New("user not verified")
	ErrUserNotFound           = errors.New("user not found")
	ErrEmailAlreadyRegistered = errors.New("email is already registered")
	ErrPhoneAlreadyRegistered = errors.New("phone number is already registered")
)

/*
UserStatus reflects the lifecycle state of a user account.
Matches DB column: users.status
*/
type UserStatus string

const (
	UserStatusPending     UserStatus = "PENDING"
	UserStatusActive      UserStatus = "ACTIVE"
	UserStatusSuspended   UserStatus = "SUSPENDED"
	UserStatusDeactivated UserStatus = "DEACTIVATED"
)

type User struct {
	ID          int64
	FirstName   string
	LastName    string
	UserName    string
	Email       string
	PhoneNumber string
	Password    []byte
	Role        Role

	Age            int
	EducationLevel string
	Country        string
	Region         string

	EmailVerified bool
	PhoneVerified bool
	Status        UserStatus

	LastLogin         *time.Time
	ProfileCompleted  bool
	ProfilePictureURL string
	PreferredLanguage string

	CreatedAt time.Time
	UpdatedAt *time.Time
}

type UserProfileResponse struct {
	ID                int64      `json:"id"`
	FirstName         string     `json:"first_name"`
	LastName          string     `json:"last_name"`
	UserName          string     `json:"user_name,omitempty"`
	Email             string     `json:"email,omitempty"`
	PhoneNumber       string     `json:"phone_number,omitempty"`
	Role              Role       `json:"role"`
	Age               int        `json:"age,omitempty"`
	EducationLevel    string     `json:"education_level,omitempty"`
	Country           string     `json:"country,omitempty"`
	Region            string     `json:"region,omitempty"`
	EmailVerified     bool       `json:"email_verified"`
	PhoneVerified     bool       `json:"phone_verified"`
	Status            UserStatus `json:"status"`
	LastLogin         *time.Time `json:"last_login,omitempty"`
	ProfileCompleted  bool       `json:"profile_completed"`
	ProfilePictureURL string     `json:"profile_picture_url,omitempty"`
	PreferredLanguage string     `json:"preferred_language,omitempty"`
	CreatedAt         time.Time  `json:"created_at"`
	UpdatedAt         *time.Time `json:"updated_at,omitempty"`
}

type UserFilter struct {
	Role string

	Page          ValidInt
	PageSize      ValidInt
	Query         ValidString
	CreatedBefore ValidTime
	CreatedAfter  ValidTime
}

type RegisterUserReq struct {
	FirstName   string
	LastName    string
	UserName    string
	Email       string
	PhoneNumber string
	Password    string
	Role        string

	OtpMedium OtpMedium

	Age               int
	EducationLevel    string
	Country           string
	Region            string
	PreferredLanguage string
}

type CreateUserReq struct {
	FirstName   string
	LastName    string
	UserName    string
	Email       string
	PhoneNumber string
	Password    string
	Role        string

	Status UserStatus

	Age               int
	EducationLevel    string
	Country           string
	Region            string
	PreferredLanguage string
}

type ResetPasswordReq struct {
	UserName string
	Password string
	OtpCode  string
}

type UpdateUserReq struct {
	UserID int64

	FirstName ValidString
	LastName  ValidString
	UserName  ValidString

	Status ValidString

	Age            ValidInt
	EducationLevel ValidString
	Country        ValidString
	Region         ValidString

	ProfileCompleted  ValidBool
	ProfilePictureURL ValidString
	PreferredLanguage ValidString
}