package webhook

// TwilioWebhookHandler processes incoming Twilio SMS webhook HTTP requests via Gin.
// Reference: Facebook webhook adapter pattern (facebook_webhook.go)
//
// URL patterns:
//   /webhooks/twilio/sms/:inbox_id     — inbound SMS/MMS
//   /webhooks/twilio/status/:inbox_id  — delivery status callbacks
//
// Method: POST (Twilio sends form-encoded data, not JSON)

import (
	"net/http"
	"strconv"

	twiliochannel "github.com/gochat/gochat/internal/channel/twilio"
	"github.com/gochat/gochat/internal/model"
	applogger "github.com/gochat/gochat/pkg/logger"

	"github.com/gin-gonic/gin"
	"gorm.io/gorm"
)

// TwilioWebhookHandler processes Twilio SMS webhook requests via Gin.
type TwilioWebhookHandler struct {
	twilioWebhook *twiliochannel.WebhookHandler
	db            *gorm.DB
}

// NewTwilioWebhookHandler creates a Twilio SMS webhook handler for Gin integration.
func NewTwilioWebhookHandler(twilioWebhook *twiliochannel.WebhookHandler, db *gorm.DB) *TwilioWebhookHandler {
	return &TwilioWebhookHandler{
		twilioWebhook: twilioWebhook,
		db:            db,
	}
}

// HandleTwilioInboundSMS processes an incoming Twilio SMS webhook Gin request.
func (h *TwilioWebhookHandler) HandleTwilioInboundSMS(c *gin.Context) {
	inboxIDStr := c.Param("inbox_id")
	inboxID, err := strconv.ParseUint(inboxIDStr, 10, 32)
	if err != nil {
		applogger.L().Warnf("Twilio webhook: invalid inbox_id %s", inboxIDStr)
		c.Data(http.StatusOK, "application/xml", []byte("<Response></Response>"))
		return
	}

	// Lookup inbox from database
	inbox, err := h.lookupInbox(uint(inboxID))
	if err != nil {
		applogger.L().Warnf("Twilio webhook: inbox lookup failed for id %d: %v", inboxID, err)
		c.Data(http.StatusOK, "application/xml", []byte("<Response></Response>"))
		return
	}

	// Dispatch to the channel-level webhook handler
	// Twilio expects a TwiML XML response, not JSON
	h.twilioWebhook.HandleInboundSMS(c.Writer, c.Request, inbox)
}

// HandleTwilioDeliveryStatus processes a Twilio delivery status callback.
func (h *TwilioWebhookHandler) HandleTwilioDeliveryStatus(c *gin.Context) {
	inboxIDStr := c.Param("inbox_id")
	inboxID, err := strconv.ParseUint(inboxIDStr, 10, 32)
	if err != nil {
		applogger.L().Warnf("Twilio status webhook: invalid inbox_id %s", inboxIDStr)
		c.Status(http.StatusOK)
		return
	}

	// Lookup inbox from database
	inbox, err := h.lookupInbox(uint(inboxID))
	if err != nil {
		applogger.L().Warnf("Twilio status webhook: inbox lookup failed for id %d: %v", inboxID, err)
		c.Status(http.StatusOK)
		return
	}

	// Dispatch to the channel-level delivery status handler
	h.twilioWebhook.HandleDeliveryStatus(c.Writer, c.Request, inbox)
}

// lookupInbox fetches an Inbox record from the database.
func (h *TwilioWebhookHandler) lookupInbox(inboxID uint) (*model.Inbox, error) {
	var inbox model.Inbox
	if err := h.db.Where("id = ?", inboxID).First(&inbox).Error; err != nil {
		return nil, err
	}
	return &inbox, nil
}