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"

	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 LINEChannelHandler pattern: uses top-level ChannelTwilioSMSService for CRUD,
// generic InboxService for inbox lifecycle.
type TwilioChannelHandler struct {
	twChannelSvc *service.ChannelTwilioSMSService
	inboxSvc     *service.InboxService
	twRepo       *repository.ChannelTwilioSMSRepo
}

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

// CreateTwilioSMSChannelRequest is the DTO for creating a Twilio SMS channel.
type CreateTwilioSMSChannelRequest 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"`
}

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

	var req CreateTwilioSMSChannelRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		applogger.L().Errorf("Failed to bind Twilio SMS channel create request: %v", err)
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body"})
		return
	}

	ctx := c.Request.Context()

	// Create the channel record first (without InboxID)
	ch := &channelmodel.ChannelTwilioSMS{
		AccountSID:          req.AccountSID,
		PhoneNumber:         req.PhoneNumber,
		MessagingServiceSID: req.MessagingServiceSID,
		AccountID:           uint(accountID),
	}

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

	// Create inbox for the Twilio SMS channel
	inboxName := req.InboxName
	if inboxName == "" {
		inboxName = req.PhoneNumber
	}
	inboxReq := service.CreateInboxRequest{
		Name:        inboxName,
		ChannelType: "twilio_sms",
		Enabled:     true,
	}

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

	// Update channel with InboxID
	ch.InboxID = inbox.ID
	if err := h.twChannelSvc.Update(ctx, ch); err != nil {
		applogger.L().Errorf("Failed to update Twilio SMS channel with inbox_id: %v", err)
	}

	c.JSON(http.StatusCreated, gin.H{
		"channel": ch,
		"inbox":   inbox,
	})
}

// Get retrieves a Twilio SMS channel by ID.
// GET /api/v1/accounts/:id/channels/twilio_channel/:tw_id
func (h *TwilioChannelHandler) Get(c *gin.Context) {
	twIDStr := c.Param("tw_id")
	twID, err := strconv.ParseUint(twIDStr, 10, 64)
	if err != nil {
		applogger.L().Errorf("Invalid tw_id: %v", err)
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid tw_id"})
		return
	}

	ch, err := h.twChannelSvc.GetByID(c.Request.Context(), 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
	}

	c.JSON(http.StatusOK, gin.H{"channel": ch})
}

// UpdateTwilioSMSChannelRequest is the DTO for updating a Twilio SMS channel.
type UpdateTwilioSMSChannelRequest struct {
	PhoneNumber         *string `json:"phone_number"`
	MessagingServiceSID *string `json:"messaging_service_sid"`
	InboxName           *string `json:"inbox_name"`
}

// Update updates a Twilio SMS channel configuration.
// PATCH /api/v1/accounts/:id/channels/twilio_channel/:tw_id
func (h *TwilioChannelHandler) Update(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 UpdateTwilioSMSChannelRequest
	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.StatusUnprocessableEntity, gin.H{"error": "failed to update Twilio SMS channel"})
		return
	}

	// Update inbox name if provided
	if req.InboxName != nil && ch.InboxID > 0 {
		updateReq := service.UpdateInboxRequest{
			Name: *req.InboxName,
		}
		if _, inboxErr := h.inboxSvc.Update(ctx, uint(accountID), ch.InboxID, updateReq); inboxErr != nil {
			applogger.L().Warnf("Failed to update Twilio SMS inbox name: %v", inboxErr)
		}
	}

	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,
		"message":             "Twilio SMS channel updated successfully",
	})
}

// Delete removes a Twilio SMS channel and its associated inbox.
// DELETE /api/v1/accounts/:id/channels/twilio_channel/:tw_id
func (h *TwilioChannelHandler) Delete(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
	}

	// 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.StatusUnprocessableEntity, 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"})
}

// List lists all Twilio SMS channels for an account.
// GET /api/v1/accounts/:id/channels/twilio_channel
func (h *TwilioChannelHandler) List(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.StatusUnprocessableEntity, gin.H{"error": "failed to list Twilio SMS channels"})
		return
	}

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