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 UpdateKnowledgeLevelReq struct {
	UserID         int64  `json:"user_id"`
	KnowledgeLevel string `json:"knowledge_level"` // BEGINNER, INTERMEDIATE, ADVANCED
}

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

	// Profile fields
	KnowledgeLevel               string
	initial_assessment_completed bool
	NickName                     string
	Occupation                   string
	LearningGoal                 string
	LanguageGoal                 string
	LanguageChallange            string
	FavoutiteTopic               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"`

	// Profile fields
	InitialAssessmentCompleted bool   `json:"initial_assessment_completed,omitempty"`
	NickName                   string `json:"nick_name,omitempty"`
	Occupation                 string `json:"occupation,omitempty"`
	LearningGoal               string `json:"learning_goal,omitempty"`
	LanguageGoal               string `json:"language_goal,omitempty"`
	LanguageChallange          string `json:"language_challange,omitempty"`
	FavoutiteTopic             string `json:"favoutite_topic,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 `json:"first_name"`
	LastName    string `json:"last_name"`
	UserName    string `json:"user_name"`
	Email       string `json:"email"`
	PhoneNumber string `json:"phone_number"`
	Password    string `json:"password"`
	Role        string `json:"role"`

	OtpMedium OtpMedium `json:"otp_medium"`

	NickName          string `json:"nick_name,omitempty"`
	Occupation        string `json:"occupation,omitempty"`
	LearningGoal      string `json:"learning_goal,omitempty"`
	LanguageGoal      string `json:"language_goal,omitempty"`
	LanguageChallange string `json:"language_challange,omitempty"`
	FavoutiteTopic    string `json:"favoutite_topic,omitempty"`

	Age               int    `json:"age,omitempty"`
	EducationLevel    string `json:"education_level,omitempty"`
	Country           string `json:"country,omitempty"`
	Region            string `json:"region,omitempty"`
	PreferredLanguage string `json:"preferred_language,omitempty"`
}

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

	// Profile fields
	NickName          string
	Occupation        string
	LearningGoal      string
	LanguageGoal      string
	LanguageChallange string
	FavoutiteTopic    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

	// Profile fields
	KnowledgeLevel    ValidString
	NickName          ValidString
	Occupation        ValidString
	LearningGoal      ValidString
	LanguageGoal      ValidString
	LanguageChallange ValidString
	FavoutiteTopic    ValidString

	ProfileCompleted  ValidBool
	ProfilePictureURL ValidString
	PreferredLanguage ValidString
}