package channel

// ChannelTelegram represents a Telegram bot channel configuration.
// Reference: Chatwoot app/models/channel/telegram.rb
//
// Chatwoot's ChannelTelegram model attributes:
//   - account_id: FK to Account
//   - bot_token: Telegram Bot API token (from @BotFather)
//   - bot_name: Bot display name (validated via getMe API)
//   - welcome_message: Auto-sent to new contacts
//   - reauthorization_required: Flag when webhook/bot fails
//
// Chatwoot lifecycle hooks:
//   - before_validation :ensure_valid_bot_token → calls getMe API
//   - before_save :setup_telegram_webhook → calls setWebhook API
//   - after_destroy :delete_telegram_webhook → calls deleteWebhook API
//
// gochat enhancements beyond Chatwoot:
//   - webhook_url: Stores the configured webhook URL for verification
//   - account_id: Explicit FK (Chatwoot uses polymorphic through Inbox)
//   - welcome_message: Moved to channel model (Chatwoot uses inbox settings)
//   - reauthorization_required: Tracks when bot needs re-auth

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

// ChannelTelegram stores Telegram bot configuration for a channel.
type ChannelTelegram struct {
	model.Base // ID, CreatedAt, UpdatedAt, DeletedAt (soft delete via GORM)

	// 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"`

	// Bot token obtained from @BotFather (format: N:XXXXX)
	// Reference: Chatwoot EDITABLE_ATTRS = [:bot_token]
	BotToken string `gorm:"type:varchar(255);not null;unique" json:"bot_token"`

	// Bot display name — validated and set via getMe API
	// Reference: Chatwoot sets this during ensure_valid_bot_token
	BotName string `gorm:"type:varchar(255)" json:"bot_name,omitempty"`

	// Webhook URL configured via setWebhook API
	// gochat extension: stored for verification/debugging
	WebhookURL string `gorm:"type:varchar(512)" json:"webhook_url,omitempty"`

	// Welcome message sent to new contacts
	// Reference: Chatwoot uses inbox.welcome_message, gochat puts it on the channel model
	WelcomeMessage string `gorm:"type:text" json:"welcome_message,omitempty"`

	// Flag indicating the bot token needs reauthorization
	// Reference: Chatwoot reauthorization_required attribute
	// Set when webhook delivery fails or getMe validation fails
	ReauthorizationRequired bool `gorm:"default:false" json:"reauthorization_required,omitempty"`
}

// TableName returns the GORM table name for ChannelTelegram.
// GetChannelBase returns a ChannelBase populated from ChannelTelegram fields.
// Required by the Channelable interface.
func (ct *ChannelTelegram) GetChannelBase() ChannelBase {
	return ChannelBase{
		ID:          ct.ID,
		AccountID:   ct.AccountID,
		InboxID:     ct.InboxID,
		ChannelType: ct.GetChannelType(),
		CreatedAt:   ct.CreatedAt,
		UpdatedAt:   ct.UpdatedAt,
		DeletedAt:   ct.DeletedAt,
	}
}

// GetChannelType returns the channel type identifier.
func (ct *ChannelTelegram) GetChannelType() string { return "telegram" }

func (ChannelTelegram) TableName() string {
	return "channel_telegrams"
}