package v1

// TwilioChannelHandler handles Twilio SMS channel-specific configuration CRUD.
// Reference: Chatwoot app/controllers/api/v1/accounts/channels/twilio_controller.rb
//
// Twilio SMS API: https://www.twilio.com/docs/sms
//
// gochat maps Twilio SMS channel operations to:
//   - POST   /api/v1/accounts/:id/channels/twilio_channel            → create Twilio SMS inbox
//   - GET    /api/v1/accounts/:id/channels/twilio_channel/:tw_id     → get Twilio SMS channel
//   - PATCH  /api/v1/accounts/:id/channels/twilio_channel/:tw_id     → update Twilio SMS channel
//   - DELETE /api/v1/accounts/:id/channels/twilio_channel/:tw_id     → delete Twilio SMS channel
//   - GET    /api/v1/accounts/:id/channels/twilio_channel            → list Twilio SMS channels

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"

	twiliochannel "github.com/gochat/gochat/internal/channel/twilio"
	channelmodel "github.com/gochat/gochat/internal/model/channel"
	"github.com/gochat/gochat/internal/repository"
	"github.com/gochat/gochat/internal/service"
	applogger "github.com/gochat/gochat/pkg/logger"
)

// TwilioChannelHandler handles Twilio SMS channel management.
// Follows FacebookChannelHandler pattern: uses top-level ChannelTwilioSMSService for CRUD,
// internal TwilioProvider for webhook setup via OnCreate.
type TwilioChannelHandler struct {
	twChannelSvc *service.ChannelTwilioSMSService
	twProvider   *twiliochannel.TwilioProvider
	inboxSvc     *service.InboxService
	twRepo       *repository.ChannelTwilioSMSRepo
}

// NewTwilioChannelHandler creates a new Twilio SMS channel handler.
func NewTwilioChannelHandler(
	twChannelSvc *service.ChannelTwilioSMSService,
	twProvider *twiliochannel.TwilioProvider,
	inboxSvc *service.InboxService,
	twRepo *repository.ChannelTwilioSMSRepo,
) *TwilioChannelHandler {
	return &TwilioChannelHandler{
		twChannelSvc: twChannelSvc,
		twProvider:   twProvider,
		inboxSvc:     inboxSvc,
		twRepo:       twRepo,
	}
}

// CreateTwilioSMSChannel creates a new Twilio SMS channel and its associated inbox.
// POST /api/v1/accounts/:id/channels/twilio_channel
func (h *TwilioChannelHandler) CreateTwilioSMSChannel(c *gin.Context) {
	accountIDStr := c.Param("id")
	accountID, err := strconv.ParseUint(accountIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid account_id"})
		return
	}

	var req struct {
		AccountSID         string `json:"account_sid" validate:"required"`
		AuthToken          string `json:"auth_token" validate:"required"`
		PhoneNumber        string `json:"phone_number" validate:"required"`
		MessagingServiceSID string `json:"messaging_service_sid"`
		InboxName          string `json:"inbox_name"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		applogger.L().Errorf("Failed to bind Twilio SMS create request: %v", err)
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	ctx := c.Request.Context()

	// Create inbox first
	inboxReq := service.CreateInboxRequest{
		Name:        req.InboxName,
		ChannelType: "twilio_sms",
	}
	if req.InboxName == "" {
		inboxReq.Name = req.PhoneNumber
	}

	inbox, err := h.inboxSvc.Create(ctx, uint(accountID), inboxReq)
	if err != nil {
		applogger.L().Errorf("Failed to create inbox for Twilio SMS channel: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create inbox"})
		return
	}

	// Create Twilio SMS channel record
	ch := &channelmodel.ChannelTwilioSMS{
		AccountSID:          req.AccountSID,
		PhoneNumber:         req.PhoneNumber,
		MessagingServiceSID: req.MessagingServiceSID,
		AccountID:           uint(accountID),
		InboxID:             inbox.ID,
	}

	if err := h.twChannelSvc.Create(ctx, ch); err != nil {
		applogger.L().Errorf("Failed to create Twilio SMS channel: %v", err)
		// Rollback inbox
		if delErr := h.inboxSvc.DeleteByAccount(ctx, uint(accountID), inbox.ID); delErr != nil {
			applogger.L().Warnf("Failed to rollback inbox after Twilio SMS channel creation failure: %v", delErr)
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create Twilio SMS channel"})
		return
	}

	// Invoke provider OnCreate for webhook setup
	if onCreateErr := h.twProvider.OnCreate(ctx, inbox, ch); onCreateErr != nil {
		applogger.L().Warnf("Twilio SMS OnCreate webhook setup failed (non-blocking): %v", onCreateErr)
	}

	c.JSON(http.StatusCreated, gin.H{
		"id":                  ch.ID,
		"account_id":          ch.AccountID,
		"inbox_id":            ch.InboxID,
		"account_sid":         ch.AccountSID,
		"phone_number":        ch.PhoneNumber,
		"messaging_service_sid": ch.MessagingServiceSID,
	})
}

// GetTwilioSMSChannel retrieves a Twilio SMS channel by ID.
// GET /api/v1/accounts/:id/channels/twilio_channel/:tw_id
func (h *TwilioChannelHandler) GetTwilioSMSChannel(c *gin.Context) {
	accountIDStr := c.Param("id")
	accountID, err := strconv.ParseUint(accountIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid account_id"})
		return
	}

	twIDStr := c.Param("tw_id")
	twID, err := strconv.ParseUint(twIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid tw_id"})
		return
	}

	ctx := c.Request.Context()

	ch, err := h.twChannelSvc.GetByID(ctx, uint(twID))
	if err != nil {
		applogger.L().Errorf("Failed to get Twilio SMS channel: %v", err)
		c.JSON(http.StatusNotFound, gin.H{"error": "Twilio SMS channel not found"})
		return
	}

	// Verify account ownership
	if ch.AccountID != uint(accountID) {
		c.JSON(http.StatusForbidden, gin.H{"error": "Twilio SMS channel does not belong to this account"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"id":                  ch.ID,
		"account_id":          ch.AccountID,
		"inbox_id":            ch.InboxID,
		"account_sid":         ch.AccountSID,
		"phone_number":        ch.PhoneNumber,
		"messaging_service_sid": ch.MessagingServiceSID,
	})
}

// ListTwilioSMSChannels lists all Twilio SMS channels for an account.
// GET /api/v1/accounts/:id/channels/twilio_channel
func (h *TwilioChannelHandler) ListTwilioSMSChannels(c *gin.Context) {
	accountIDStr := c.Param("id")
	accountID, err := strconv.ParseUint(accountIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid account_id"})
		return
	}

	ctx := c.Request.Context()

	channels, err := h.twChannelSvc.ListByAccount(ctx, uint(accountID))
	if err != nil {
		applogger.L().Errorf("Failed to list Twilio SMS channels: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to list Twilio SMS channels"})
		return
	}

	result := make([]gin.H, 0, len(channels))
	for _, ch := range channels {
		result = append(result, gin.H{
			"id":                  ch.ID,
			"account_id":          ch.AccountID,
			"inbox_id":            ch.InboxID,
			"account_sid":         ch.AccountSID,
			"phone_number":        ch.PhoneNumber,
			"messaging_service_sid": ch.MessagingServiceSID,
		})
	}

	c.JSON(http.StatusOK, gin.H{"channels": result})
}

// DeleteTwilioSMSChannel deletes a Twilio SMS channel and its associated inbox.
// DELETE /api/v1/accounts/:id/channels/twilio_channel/:tw_id
func (h *TwilioChannelHandler) DeleteTwilioSMSChannel(c *gin.Context) {
	accountIDStr := c.Param("id")
	accountID, err := strconv.ParseUint(accountIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid account_id"})
		return
	}

	twIDStr := c.Param("tw_id")
	twID, err := strconv.ParseUint(twIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid tw_id"})
		return
	}

	ctx := c.Request.Context()

	ch, err := h.twChannelSvc.GetByID(ctx, uint(twID))
	if err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "Twilio SMS channel not found"})
		return
	}

	// Verify account ownership
	if ch.AccountID != uint(accountID) {
		c.JSON(http.StatusForbidden, gin.H{"error": "Twilio SMS channel does not belong to this account"})
		return
	}

	// Invoke provider OnDestroy for webhook cleanup
	if onDestroyErr := h.twProvider.OnDestroy(ctx, inboxFromID(ch.InboxID), ch); onDestroyErr != nil {
		applogger.L().Warnf("Twilio SMS OnDestroy webhook cleanup failed (non-blocking): %v", onDestroyErr)
	}

	// Delete the channel record
	if err := h.twChannelSvc.Delete(ctx, uint(twID)); err != nil {
		applogger.L().Errorf("Failed to delete Twilio SMS channel: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to delete Twilio SMS channel"})
		return
	}

	// Delete the associated inbox
	if ch.InboxID > 0 {
		if delErr := h.inboxSvc.DeleteByAccount(ctx, uint(accountID), ch.InboxID); delErr != nil {
			applogger.L().Warnf("Failed to delete inbox for Twilio SMS channel: %v", delErr)
		}
	}

	c.JSON(http.StatusOK, gin.H{"message": "Twilio SMS channel deleted successfully"})
}

// UpdateTwilioSMSChannel updates a Twilio SMS channel configuration.
// PATCH /api/v1/accounts/:id/channels/twilio_channel/:tw_id
func (h *TwilioChannelHandler) UpdateTwilioSMSChannel(c *gin.Context) {
	accountIDStr := c.Param("id")
	accountID, err := strconv.ParseUint(accountIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid account_id"})
		return
	}

	twIDStr := c.Param("tw_id")
	twID, err := strconv.ParseUint(twIDStr, 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid tw_id"})
		return
	}

	ctx := c.Request.Context()

	ch, err := h.twChannelSvc.GetByID(ctx, uint(twID))
	if err != nil {
		applogger.L().Errorf("Failed to get Twilio SMS channel for update: %v", err)
		c.JSON(http.StatusNotFound, gin.H{"error": "Twilio SMS channel not found"})
		return
	}

	// Verify account ownership
	if ch.AccountID != uint(accountID) {
		c.JSON(http.StatusForbidden, gin.H{"error": "Twilio SMS channel does not belong to this account"})
		return
	}

	var req struct {
		PhoneNumber         *string `json:"phone_number"`
		MessagingServiceSID *string `json:"messaging_service_sid"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body", "details": err.Error()})
		return
	}

	if req.PhoneNumber != nil {
		ch.PhoneNumber = *req.PhoneNumber
	}
	if req.MessagingServiceSID != nil {
		ch.MessagingServiceSID = *req.MessagingServiceSID
	}

	if err := h.twChannelSvc.Update(ctx, ch); err != nil {
		applogger.L().Errorf("Failed to update Twilio SMS channel: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to update Twilio SMS channel"})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"id":                  ch.ID,
		"account_id":          ch.AccountID,
		"inbox_id":            ch.InboxID,
		"account_sid":         ch.AccountSID,
		"phone_number":        ch.PhoneNumber,
		"messaging_service_sid": ch.MessagingServiceSID,
	})
}