package channel

// ChannelLINE represents a LINE Official Account channel configuration.
// Reference: LINE Messaging API — https://developers.line.biz/en/docs/messaging-api/
//
// GoChat addition — LINE Messaging API integration.
// The LINE channel connects LINE Official Accounts to gochat conversations.
//
// Key LINE API concepts:
//   - Channel Access Token: long-lived token for API calls (renewable)
//   - Channel Secret: used for webhook signature verification (HMAC-SHA256)
//   - LINE Login: OAuth2 flow for user authentication (optional)
//   - Webhook URL: where LINE sends event notifications
//
// Design notes:
//   - Uses GORM soft-delete pattern consistent with other channel models
//   - JSON field tags follow snake_case convention per P2D §7
//   - Channel-specific fields (channel_access_token, channel_secret) are stored
//     in Inbox.ChannelConfig rather than in this model, keeping the model lean
//     per the Chatwoot pattern where channel_type specific config lives in the polymorphic association

import "gorm.io/gorm"

// ChannelLINE is the GORM model for LINE Official Account channels.
// Reference: Chatwoot does not have LINE channel support — this is a GoChat addition.
// Design: Follows the same pattern as ChannelTelegram — minimal GORM model with
// config stored in Inbox.ChannelConfig (JSONB).
type ChannelLINE struct {
	gorm.Model

	// LINE Channel ID (from LINE Developers Console)
	// Unique identifier for the LINE Official Account
	ChannelID string `json:"channel_id" gorm:"type:varchar(255);uniqueIndex;not null"`

	// LINE Official Account name (display name)
	Name string `json:"name" gorm:"type:varchar(255)"`

	// AccountID references the owning account (multi-tenant)
	// Foreign key to accounts table for tenant isolation
	AccountID uint `json:"account_id" gorm:"index;not null"`

	// InboxID references the associated inbox (1:1 with channel)
	InboxID uint `json:"inbox_id" gorm:"uniqueIndex;not null"`
}

// TableName overrides GORM table name convention.
func (ChannelLINE) TableName() string { return "channel_lines" }

// Channelable interface implementation for ChannelLINE.
// Returns LINE-specific identifiers and display name.

func (c *ChannelLINE) GetChannelType() string  { return "line" }
func (c *ChannelLINE) GetChannelID() string    { return c.ChannelID }
func (c *ChannelLINE) GetName() string         { return c.Name }
func (c *ChannelLINE) GetAccountID() uint      { return c.AccountID }
func (c *ChannelLINE) GetInboxID() uint        { return c.InboxID }
func (c *ChannelLINE) SetInboxID(id uint)      { c.InboxID = id }