package entities

import (
	"time"

	"gorm.io/gorm"
)

// User 用户实体
type User struct {
	ID          string         `gorm:"primaryKey;type:varchar(36)" json:"id"`
	Username    string         `gorm:"uniqueIndex;type:varchar(50);not null" json:"username"`
	Email       string         `gorm:"uniqueIndex;type:varchar(100);not null" json:"email"`
	Password    string         `gorm:"type:varchar(255);not null" json:"-"`
	FirstName   string         `gorm:"type:varchar(50)" json:"first_name"`
	LastName    string         `gorm:"type:varchar(50)" json:"last_name"`
	Phone       string         `gorm:"type:varchar(20)" json:"phone"`
	Avatar      string         `gorm:"type:varchar(255)" json:"avatar"`
	Status      UserStatus     `gorm:"type:varchar(20);default:'active'" json:"status"`
	LastLoginAt *time.Time     `json:"last_login_at"`
	CreatedAt   time.Time      `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt   time.Time      `gorm:"autoUpdateTime" json:"updated_at"`
	DeletedAt   gorm.DeletedAt `gorm:"index" json:"-"`

	// 软删除字段
	IsDeleted bool `gorm:"default:false" json:"is_deleted"`

	// 版本控制
	Version int `gorm:"default:1" json:"version"`
}

// UserStatus 用户状态枚举
type UserStatus string

const (
	UserStatusActive    UserStatus = "active"
	UserStatusInactive  UserStatus = "inactive"
	UserStatusSuspended UserStatus = "suspended"
	UserStatusPending   UserStatus = "pending"
)

// 实现 Entity 接口
func (u *User) GetID() string {
	return u.ID
}

func (u *User) GetCreatedAt() time.Time {
	return u.CreatedAt
}

func (u *User) GetUpdatedAt() time.Time {
	return u.UpdatedAt
}

// 业务方法
func (u *User) IsActive() bool {
	return u.Status == UserStatusActive && !u.IsDeleted
}

func (u *User) GetFullName() string {
	if u.FirstName == "" && u.LastName == "" {
		return u.Username
	}
	return u.FirstName + " " + u.LastName
}

func (u *User) CanLogin() bool {
	return u.IsActive() && u.Status != UserStatusSuspended
}

func (u *User) MarkAsDeleted() {
	u.IsDeleted = true
	u.Status = UserStatusInactive
}

func (u *User) Restore() {
	u.IsDeleted = false
	u.Status = UserStatusActive
}

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

// 验证方法
func (u *User) Validate() error {
	if u.Username == "" {
		return NewValidationError("username is required")
	}
	if u.Email == "" {
		return NewValidationError("email is required")
	}
	if u.Password == "" {
		return NewValidationError("password is required")
	}
	return nil
}

// TableName 指定表名
func (User) TableName() string {
	return "users"
}

// ValidationError 验证错误
type ValidationError struct {
	Message string
}

func (e *ValidationError) Error() string {
	return e.Message
}

func NewValidationError(message string) *ValidationError {
	return &ValidationError{Message: message}
}

// UserProfile 用户档案（扩展信息）
type UserProfile struct {
	ID        string     `gorm:"primaryKey;type:varchar(36)" json:"id"`
	UserID    string     `gorm:"type:varchar(36);not null;index" json:"user_id"`
	Bio       string     `gorm:"type:text" json:"bio"`
	Location  string     `gorm:"type:varchar(100)" json:"location"`
	Website   string     `gorm:"type:varchar(255)" json:"website"`
	Birthday  *time.Time `json:"birthday"`
	Gender    string     `gorm:"type:varchar(10)" json:"gender"`
	Timezone  string     `gorm:"type:varchar(50)" json:"timezone"`
	Language  string     `gorm:"type:varchar(10);default:'zh-CN'" json:"language"`
	CreatedAt time.Time  `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt time.Time  `gorm:"autoUpdateTime" json:"updated_at"`

	// 关联关系
	User *User `gorm:"foreignKey:UserID;references:ID" json:"user,omitempty"`
}

func (UserProfile) TableName() string {
	return "user_profiles"
}