package model

import (
	"time"

	"gorm.io/gorm"
)

// AccessToken represents a personal API access token with polymorphic ownership.
// Reference: Chatwoot AccessToken model + AccessTokenable concern + P2B M12 spec
//
// AccessTokens can belong to either a User (personal API tokens) or a PlatformApp
// (agent bot / integration tokens). The polymorphic ownership is modeled via
// OwnerType + OwnerID, matching Chatwoot's AccessTokenable concern pattern.
//
// OwnerType values: "User" (personal tokens), "PlatformApp" (bot/integration tokens).
type AccessToken struct {
	ID          uint       `gorm:"primaryKey;autoIncrement" json:"id"`
	OwnerType   string     `gorm:"size:100;not null;index" json:"owner_type"` // User, PlatformApp
	OwnerID     uint       `gorm:"not null;index" json:"owner_id"`
	Token       string     `gorm:"size:255;not null;uniqueIndex" json:"token"`                           // stores SHA-256 hash
	TokenPrefix string     `gorm:"size:20;not null;index" json:"token_prefix"`                          // first 8 chars for fast lookup
	Name        string     `gorm:"size:255" json:"name"`
	ExpiresAt   *time.Time `json:"expires_at,omitempty"`
	LastUsedAt  *time.Time `json:"last_used_at,omitempty"`
	CreatedAt   time.Time  `gorm:"autoCreateTime" json:"created_at"`
	UpdatedAt   time.Time  `gorm:"autoUpdateTime" json:"updated_at"`
	DeletedAt   gorm.DeletedAt `gorm:"index" json:"deleted_at,omitempty"`

	// Relations (polymorphic — loaded based on OwnerType)
	User        User        `gorm:"foreignKey:OwnerID;conditions:owner_type='User'" json:"user,omitempty"`
	PlatformApp PlatformApp `gorm:"foreignKey:OwnerID;conditions:owner_type='PlatformApp'" json:"platform_app,omitempty"`
}

func (AccessToken) TableName() string { return "access_tokens" }

// AccessTokenOwnerType constants — valid polymorphic owner types.
const (
	AccessTokenOwnerTypeUser        = "User"
	AccessTokenOwnerTypePlatformApp = "PlatformApp"
)