package channel

// ChannelTikTok represents a TikTok Business channel configuration.
// Reference: TikTok Business API — https://business-api.tiktok.com/portal/auth
//
// GoChat addition (Chatwoot does not have TikTok channel support).
// TikTok Business API provides:
//   - OAuth2 authentication flow for connecting TikTok Business accounts
//   - Direct messaging API for sending/receiving customer messages
//   - Webhook events for incoming messages, read receipts, etc.
//
// Lifecycle:
//   - OnCreate: OAuth2 token exchange → store access_token/refresh_token → setup webhook
//   - OnReauthorization: refresh expired tokens via TikTok OAuth2 refresh endpoint
//   - OnDestroy: delete webhook subscription

import (
	"time"

	"github.com/gochat/gochat/internal/model"
)

// ChannelTikTok stores TikTok Business channel configuration.
type ChannelTikTok struct {
	model.Base // ID, CreatedAt, UpdatedAt, DeletedAt

	// Account foreign key
	AccountID uint `gorm:"index;not null" json:"account_id"`

	// Inbox foreign key — links to the Inbox that wraps this channel
	InboxID uint `gorm:"index" json:"inbox_id,omitempty"`

	// TikTok Business account ID (obtained after OAuth authorization)
	TikTokBusinessID string `gorm:"column:tiktok_business_id;type:varchar(255);not null" json:"tiktok_business_id"`

	// OAuth2 tokens (obtained via BuildAuthURL → ExchangeToken flow)
	AccessToken    string    `gorm:"type:varchar(512)" json:"access_token,omitempty"`
	RefreshToken   string    `gorm:"type:varchar(512)" json:"refresh_token,omitempty"`
	TokenExpiresAt time.Time `gorm:"" json:"token_expires_at,omitempty"`

	// Webhook verification token (set during channel creation for webhook setup)
	WebhookVerifyToken string `gorm:"type:varchar(255)" json:"webhook_verify_token,omitempty"`

	// Flag indicating the channel needs re-authorization (token expired/revoked)
	ReauthorizationRequired bool `gorm:"default:false" json:"reauthorization_required,omitempty"`
}

// GetChannelBase returns the common ChannelBase fields.
// For TikTok, we construct a ChannelBase from our fields since we don't embed it directly.
func (c ChannelTikTok) GetChannelBase() ChannelBase {
	return ChannelBase{
		ID:          c.ID,
		AccountID:   c.AccountID,
		InboxID:     c.InboxID,
		ChannelType: "tiktok",
		CreatedAt:   c.CreatedAt,
		UpdatedAt:   c.UpdatedAt,
		DeletedAt:   c.DeletedAt,
	}
}

// GetChannelType returns the channel type identifier.
func (c ChannelTikTok) GetChannelType() string { return "tiktok" }

// TableName returns the GORM table name for ChannelTikTok.
func (ChannelTikTok) TableName() string { return "channel_tiktoks" }