gochat/internal/service/whatsapp_call_service.go

package service

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"strings"
	"time"

	"github.com/go-resty/resty/v2"
	"github.com/gochat/gochat/internal/model"
	channelmodel "github.com/gochat/gochat/internal/model/channel"
	"github.com/gochat/gochat/internal/repository"
	applogger "github.com/gochat/gochat/pkg/logger"
	"gorm.io/datatypes"
	"gorm.io/gorm"
)

// WhatsAppCallService implements business logic for WhatsAppCall operations.
type WhatsAppCallService struct {
	repo     *repository.WhatsAppCallRepo
	provider WhatsAppCallProvider
}

// NewWhatsAppCallService creates a new WhatsAppCall service.
func NewWhatsAppCallService(repo *repository.WhatsAppCallRepo, providers ...WhatsAppCallProvider) *WhatsAppCallService {
	provider := WhatsAppCallProvider(defaultWhatsAppCallProvider{client: resty.New()})
	if len(providers) > 0 && providers[0] != nil {
		provider = providers[0]
	}
	return &WhatsAppCallService{repo: repo, provider: provider}
}

// WhatsAppCallProvider wraps Meta WhatsApp Calling operations behind a fakeable boundary.
type WhatsAppCallProvider interface {
	InitiateCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, toNumber string, sdpOffer string) (string, error)
	PreAcceptCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, providerCallID string, sdpAnswer string) error
	AcceptCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, providerCallID string, sdpAnswer string) error
	RejectCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, providerCallID string) error
	TerminateCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, providerCallID string) error
	SendCallPermissionRequest(ctx context.Context, channel *channelmodel.ChannelWhatsApp, toNumber string, body string) (string, error)
}

var (
	ErrWhatsAppCallNotEnabled              = errors.New("WhatsApp calling is not enabled for this inbox")
	ErrWhatsAppCallSDPOfferRequired        = errors.New("sdp_offer is required")
	ErrWhatsAppCallSDPAnswerRequired       = errors.New("sdp_answer is required")
	ErrWhatsAppCallContactPhoneRequired    = errors.New("Contact phone number is required")
	ErrWhatsAppCallNoRecording             = errors.New("recording is required")
	ErrWhatsAppCallNoMessage               = errors.New("Call message not found")
	ErrWhatsAppCallPermissionRequired      = errors.New("WhatsApp call permission required")
	ErrWhatsAppCallPermissionRequestFailed = errors.New("Failed to send WhatsApp call permission request")
	ErrWhatsAppCallAlreadyAccepted         = errors.New("Call already accepted by another agent")
	ErrWhatsAppCallNotRinging              = errors.New("Call is not in ringing state")
)

// WhatsAppCallCreateRequest is the DTO for creating a WhatsApp call.
type WhatsAppCallCreateRequest struct {
	CallID         string `json:"call_id" validate:"required"`
	InboxID        uint   `json:"inbox_id" validate:"required"`
	ConversationID uint   `json:"conversation_id" validate:"required"`
	CallStatus     string `json:"call_status" validate:"required"`
	Duration       int    `json:"duration"`
	CallerNumber   string `json:"caller_number"`
}

// validCallStatuses defines allowed WhatsApp call status values.
var validCallStatuses = map[string]bool{"ringing": true, "active": true, "ended": true, "failed": true}

// GetByCallID retrieves a WhatsApp call by its call ID.
func (s *WhatsAppCallService) GetByCallID(ctx context.Context, callID string) (*model.WhatsAppCall, error) {
	call, err := s.repo.FindByCallID(ctx, callID)
	if err != nil {
		applogger.L().Errorf("WhatsAppCallService.GetByCallID error: %v", err)
		return nil, err
	}
	return call, nil
}

// ListByConversation retrieves all WhatsApp calls for a conversation.
func (s *WhatsAppCallService) ListByConversation(ctx context.Context, conversationID uint) ([]model.WhatsAppCall, error) {
	calls, err := s.repo.FindByConversationID(ctx, conversationID)
	if err != nil {
		applogger.L().Errorf("WhatsAppCallService.ListByConversation error: %v", err)
		return nil, err
	}
	return calls, nil
}

// CreateFromRequest creates a new WhatsApp call record from a DTO.
func (s *WhatsAppCallService) CreateFromRequest(ctx context.Context, req *WhatsAppCallCreateRequest) (*model.WhatsAppCall, error) {
	if !validCallStatuses[req.CallStatus] {
		return nil, errors.New("invalid call_status: must be ringing/active/ended/failed")
	}
	call := &model.WhatsAppCall{
		CallID:         req.CallID,
		InboxID:        req.InboxID,
		ConversationID: req.ConversationID,
		CallStatus:     req.CallStatus,
		Duration:       req.Duration,
		CallerNumber:   req.CallerNumber,
	}
	if err := s.repo.Create(ctx, call); err != nil {
		applogger.L().Errorf("WhatsAppCallService.CreateFromRequest error: %v", err)
		return nil, err
	}
	return call, nil
}

// UpdateByCallID updates a WhatsApp call by its call_id (e.g. status transition).
func (s *WhatsAppCallService) UpdateByCallID(ctx context.Context, callID string, callStatus string, duration int) (*model.WhatsAppCall, error) {
	if !validCallStatuses[callStatus] {
		return nil, errors.New("invalid call_status: must be ringing/active/ended/failed")
	}
	call, err := s.repo.FindByCallID(ctx, callID)
	if err != nil {
		return nil, err
	}
	call.CallStatus = callStatus
	call.Duration = duration
	if err := s.repo.Update(ctx, call); err != nil {
		applogger.L().Errorf("WhatsAppCallService.UpdateByCallID error: %v", err)
		return nil, err
	}
	return call, nil
}

// DeleteByCallID deletes a WhatsApp call record by call_id.
func (s *WhatsAppCallService) DeleteByCallID(ctx context.Context, callID string) error {
	call, err := s.repo.FindByCallID(ctx, callID)
	if err != nil {
		return err
	}
	if err := s.repo.Delete(ctx, call.ID); err != nil {
		applogger.L().Errorf("WhatsAppCallService.DeleteByCallID error: %v", err)
		return err
	}
	return nil
}

// GetAccountCall returns a Chatwoot account-scoped WhatsApp Call row.
func (s *WhatsAppCallService) GetAccountCall(ctx context.Context, accountID, callID uint) (*model.Call, error) {
	return s.findAccountCall(ctx, accountID, callID)
}

type WhatsAppCallInitiateRequest struct {
	ConversationID uint
	SDPOffer       string
	AgentID        uint
}

type WhatsAppCallInitiateResult struct {
	Call              *model.Call
	PermissionStatus  string
	PermissionMessage string
}

// Initiate creates an outbound WhatsApp Call and linked voice_call message.
// Reference: Enterprise WhatsappCallsController#initiate.
func (s *WhatsAppCallService) Initiate(ctx context.Context, accountID uint, req WhatsAppCallInitiateRequest) (*WhatsAppCallInitiateResult, error) {
	if strings.TrimSpace(req.SDPOffer) == "" {
		return nil, ErrWhatsAppCallSDPOfferRequired
	}

	var conversation model.Conversation
	db := s.repo.DB().WithContext(ctx)
	if err := db.Where("account_id = ? AND display_id = ?", accountID, req.ConversationID).First(&conversation).Error; err != nil {
		if err := db.Where("account_id = ? AND id = ?", accountID, req.ConversationID).First(&conversation).Error; err != nil {
			return nil, err
		}
	}

	inbox, contact, channel, err := s.loadCallContext(ctx, accountID, conversation.InboxID, conversation.ContactID)
	if err != nil {
		return nil, err
	}
	if !whatsAppCallingEnabled(inbox, channel) {
		return nil, ErrWhatsAppCallNotEnabled
	}
	if strings.TrimSpace(contact.PhoneNumber) == "" {
		return nil, ErrWhatsAppCallContactPhoneRequired
	}

	toNumber := strings.TrimPrefix(strings.TrimSpace(contact.PhoneNumber), "+")
	providerCallID, err := s.provider.InitiateCall(ctx, channel, toNumber, req.SDPOffer)
	if err != nil {
		if errors.Is(err, ErrWhatsAppCallPermissionRequired) {
			return s.handlePermissionRequest(ctx, &conversation, inbox, channel, toNumber)
		}
		return nil, err
	}

	var call model.Call
	err = s.repo.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		attrs := map[string]any{"sdp_offer": req.SDPOffer, "ice_servers": defaultWhatsAppIceServers()}
		encodedAttrs, _ := json.Marshal(attrs)
		call = model.Call{
			AccountID:            accountID,
			InboxID:              inbox.ID,
			ConversationID:       conversation.ID,
			ContactID:            contact.ID,
			AcceptedByAgentID:    &req.AgentID,
			Provider:             "whatsapp",
			Direction:            "outgoing",
			ProviderCallID:       providerCallID,
			Status:               "ringing",
			CallerType:           "User",
			CallerID:             req.AgentID,
			CallDirection:        "outbound",
			AdditionalAttributes: json.RawMessage(encodedAttrs),
		}
		if err := tx.Create(&call).Error; err != nil {
			return err
		}
		message, err := createWhatsAppCallMessage(tx, &call, req.AgentID)
		if err != nil {
			return err
		}
		messageID := message.ID
		call.MessageID = &messageID
		return tx.Model(&call).Update("message_id", messageID).Error
	})
	if err != nil {
		return nil, err
	}
	return &WhatsAppCallInitiateResult{Call: &call}, nil
}

func (s *WhatsAppCallService) Accept(ctx context.Context, accountID, callID, agentID uint, sdpAnswer string) (*model.Call, error) {
	if strings.TrimSpace(sdpAnswer) == "" {
		return nil, ErrWhatsAppCallSDPAnswerRequired
	}
	call, err := s.findAccountCall(ctx, accountID, callID)
	if err != nil {
		return nil, err
	}
	_, _, channel, err := s.loadCallContext(ctx, accountID, call.InboxID, call.ContactID)
	if err != nil {
		return nil, err
	}
	if call.Status == "in_progress" {
		return nil, ErrWhatsAppCallAlreadyAccepted
	}
	if call.Status != "ringing" {
		return nil, ErrWhatsAppCallNotRinging
	}
	if err := s.provider.PreAcceptCall(ctx, channel, call.ProviderCallID, sdpAnswer); err != nil {
		return nil, err
	}
	if err := s.provider.AcceptCall(ctx, channel, call.ProviderCallID, sdpAnswer); err != nil {
		return nil, err
	}
	now := time.Now()
	err = s.repo.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		attrs := callAttributes(call)
		attrs["sdp_answer"] = sdpAnswer
		encodedAttrs, _ := json.Marshal(attrs)
		call.Status = "in_progress"
		call.AcceptedByAgentID = &agentID
		call.StartedAt = &now
		call.AdditionalAttributes = json.RawMessage(encodedAttrs)
		if err := tx.Save(call).Error; err != nil {
			return err
		}
		return updateWhatsAppCallMessageAndConversation(tx, call, "in_progress", agentID, nil)
	})
	return call, err
}

func (s *WhatsAppCallService) Reject(ctx context.Context, accountID, callID, agentID uint) (*model.Call, error) {
	call, err := s.findAccountCall(ctx, accountID, callID)
	if err != nil {
		return nil, err
	}
	_, _, channel, err := s.loadCallContext(ctx, accountID, call.InboxID, call.ContactID)
	if err != nil {
		return nil, err
	}
	if call.Status == "ringing" {
		if err := s.provider.RejectCall(ctx, channel, call.ProviderCallID); err != nil {
			return nil, err
		}
		err = s.finalize(ctx, call, "failed", "agent_rejected", agentID, nil)
	}
	return call, err
}

func (s *WhatsAppCallService) Terminate(ctx context.Context, accountID, callID, agentID uint) (*model.Call, error) {
	call, err := s.findAccountCall(ctx, accountID, callID)
	if err != nil {
		return nil, err
	}
	_, _, channel, err := s.loadCallContext(ctx, accountID, call.InboxID, call.ContactID)
	if err != nil {
		return nil, err
	}
	if isTerminalWhatsAppCall(call.Status) {
		return call, nil
	}
	if err := s.provider.TerminateCall(ctx, channel, call.ProviderCallID); err != nil {
		return nil, err
	}
	status := "no_answer"
	var duration *int
	if call.Status == "in_progress" {
		status = "completed"
		seconds := 0
		if call.StartedAt != nil {
			seconds = int(time.Since(*call.StartedAt).Seconds())
		}
		duration = &seconds
	}
	err = s.finalize(ctx, call, status, "agent_hangup", agentID, duration)
	return call, err
}

func (s *WhatsAppCallService) UploadRecording(ctx context.Context, accountID, callID uint, fileName string, fileSize int64) (string, error) {
	call, err := s.findAccountCall(ctx, accountID, callID)
	if err != nil {
		return "", err
	}
	if call.MessageID == nil || *call.MessageID == 0 {
		return "", ErrWhatsAppCallNoMessage
	}
	if fileName == "" {
		return "", ErrWhatsAppCallNoRecording
	}
	var existing int64
	if err := s.repo.DB().WithContext(ctx).Model(&model.Attachment{}).
		Where("message_id = ? AND file_type = ?", *call.MessageID, "audio").Count(&existing).Error; err != nil {
		return "", err
	}
	if existing > 0 {
		return "already_uploaded", nil
	}
	attachment := &model.Attachment{MessageID: *call.MessageID, AccountID: accountID, FileType: "audio", FileName: fileName, FileSize: int(fileSize), FileURL: fileName}
	if err := s.repo.DB().WithContext(ctx).Create(attachment).Error; err != nil {
		return "", err
	}
	return "uploaded", nil
}

func (s *WhatsAppCallService) finalize(ctx context.Context, call *model.Call, status, reason string, agentID uint, duration *int) error {
	return s.repo.DB().WithContext(ctx).Transaction(func(tx *gorm.DB) error {
		attrs := callAttributes(call)
		attrs["ended_at"] = time.Now().Unix()
		encodedAttrs, _ := json.Marshal(attrs)
		call.Status = status
		call.AdditionalAttributes = json.RawMessage(encodedAttrs)
		call.AcceptedByAgentID = firstUintPtr(call.AcceptedByAgentID, agentID)
		call.EndReason = reason
		if duration != nil {
			call.Duration = *duration
		}
		if err := tx.Save(call).Error; err != nil {
			return err
		}
		return updateWhatsAppCallMessageAndConversation(tx, call, status, agentID, duration)
	})
}

func (s *WhatsAppCallService) handlePermissionRequest(ctx context.Context, conversation *model.Conversation, inbox *model.Inbox, channel *channelmodel.ChannelWhatsApp, toNumber string) (*WhatsAppCallInitiateResult, error) {
	body := whatsappPermissionRequestBody(channel)
	messageID, err := s.provider.SendCallPermissionRequest(ctx, channel, toNumber, body)
	if err != nil || messageID == "" {
		return nil, ErrWhatsAppCallPermissionRequestFailed
	}
	attrs := conversationAttributes(conversation)
	attrs["call_permission_requested_at"] = time.Now().Format(time.RFC3339)
	attrs["call_permission_request_message_id"] = messageID
	encodedAttrs, _ := json.Marshal(attrs)
	if err := s.repo.DB().WithContext(ctx).Model(conversation).Update("additional_attributes", datatypes.JSON(encodedAttrs)).Error; err != nil {
		return nil, err
	}
	return &WhatsAppCallInitiateResult{PermissionStatus: "permission_requested"}, nil
}

func (s *WhatsAppCallService) findAccountCall(ctx context.Context, accountID, callID uint) (*model.Call, error) {
	var call model.Call
	err := s.repo.DB().WithContext(ctx).Where("account_id = ? AND provider = ? AND id = ?", accountID, "whatsapp", callID).First(&call).Error
	if err != nil {
		return nil, err
	}
	return &call, nil
}

func (s *WhatsAppCallService) loadCallContext(ctx context.Context, accountID, inboxID, contactID uint) (*model.Inbox, *model.Contact, *channelmodel.ChannelWhatsApp, error) {
	var inbox model.Inbox
	if err := s.repo.DB().WithContext(ctx).Where("account_id = ? AND id = ?", accountID, inboxID).First(&inbox).Error; err != nil {
		return nil, nil, nil, err
	}
	var contact model.Contact
	if err := s.repo.DB().WithContext(ctx).Where("account_id = ? AND id = ?", accountID, contactID).First(&contact).Error; err != nil {
		return nil, nil, nil, err
	}
	var channel channelmodel.ChannelWhatsApp
	if err := s.repo.DB().WithContext(ctx).Where("account_id = ? AND inbox_id = ?", accountID, inboxID).First(&channel).Error; err != nil {
		return nil, nil, nil, ErrWhatsAppCallNotEnabled
	}
	return &inbox, &contact, &channel, nil
}

func createWhatsAppCallMessage(tx *gorm.DB, call *model.Call, agentID uint) (*model.Message, error) {
	attrs := map[string]any{"data": map[string]any{"call_id": call.ID, "call_sid": call.ProviderCallID, "call_source": "whatsapp", "call_direction": "outbound", "status": displayWhatsAppCallStatus(call.Status)}}
	encodedAttrs, _ := json.Marshal(attrs)
	message := &model.Message{
		ConversationID:    call.ConversationID,
		AccountID:         call.AccountID,
		InboxID:           call.InboxID,
		SenderID:          &agentID,
		SenderType:        "user",
		Content:           "WhatsApp voice call",
		ContentType:       "voice_call",
		Status:            "sent",
		MessageType:       "outgoing",
		ContentAttributes: datatypes.JSON(encodedAttrs),
	}
	return message, tx.Create(message).Error
}

func updateWhatsAppCallMessageAndConversation(tx *gorm.DB, call *model.Call, status string, agentID uint, duration *int) error {
	if call.MessageID != nil && *call.MessageID != 0 {
		var message model.Message
		if err := tx.First(&message, *call.MessageID).Error; err == nil {
			attrs := messageAttributes(&message)
			data, _ := attrs["data"].(map[string]any)
			if data == nil {
				data = map[string]any{}
			}
			data["status"] = displayWhatsAppCallStatus(status)
			if agentID != 0 {
				data["accepted_by"] = map[string]any{"id": agentID}
			}
			if duration != nil {
				data["duration_seconds"] = *duration
			}
			attrs["data"] = data
			encodedAttrs, _ := json.Marshal(attrs)
			if err := tx.Model(&message).Update("content_attributes", datatypes.JSON(encodedAttrs)).Error; err != nil {
				return err
			}
		}
	}
	var conversation model.Conversation
	if err := tx.First(&conversation, call.ConversationID).Error; err != nil {
		return err
	}
	attrs := conversationAttributes(&conversation)
	attrs["call_status"] = displayWhatsAppCallStatus(status)
	encodedAttrs, _ := json.Marshal(attrs)
	return tx.Model(&conversation).Update("additional_attributes", datatypes.JSON(encodedAttrs)).Error
}

func firstUintPtr(existing *uint, fallback uint) *uint {
	if existing != nil {
		return existing
	}
	return &fallback
}

func callAttributes(call *model.Call) map[string]any {
	attrs := map[string]any{}
	if len(call.AdditionalAttributes) > 0 {
		_ = json.Unmarshal(call.AdditionalAttributes, &attrs)
	}
	return attrs
}

func messageAttributes(message *model.Message) map[string]any {
	attrs := map[string]any{}
	if len(message.ContentAttributes) > 0 {
		_ = json.Unmarshal(message.ContentAttributes, &attrs)
	}
	return attrs
}

func conversationAttributes(conversation *model.Conversation) map[string]any {
	attrs := map[string]any{}
	if len(conversation.AdditionalAttributes) > 0 {
		_ = json.Unmarshal(conversation.AdditionalAttributes, &attrs)
	}
	return attrs
}

func whatsAppCallingEnabled(inbox *model.Inbox, channel *channelmodel.ChannelWhatsApp) bool {
	if inbox.ChannelType != "whatsapp" || !channel.IsCloudAPI() {
		return false
	}
	inboxConfig := map[string]any{}
	_ = json.Unmarshal([]byte(inbox.ChannelConfig), &inboxConfig)
	if boolValue(inboxConfig["voice_enabled"]) {
		return true
	}
	providerConfig := map[string]any{}
	_ = json.Unmarshal([]byte(channel.ProviderConfig), &providerConfig)
	return boolValue(providerConfig["calling_enabled"])
}

func boolValue(value any) bool {
	switch v := value.(type) {
	case bool:
		return v
	case string:
		return strings.EqualFold(v, "true")
	default:
		return false
	}
}

func displayWhatsAppCallStatus(status string) string {
	return strings.ReplaceAll(status, "_", "-")
}

func displayWhatsAppCallDirection(direction string) string {
	if direction == "incoming" {
		return "inbound"
	}
	if direction == "outgoing" {
		return "outbound"
	}
	return direction
}

func isTerminalWhatsAppCall(status string) bool {
	return status == "completed" || status == "no_answer" || status == "failed"
}

func defaultWhatsAppIceServers() []map[string][]string {
	return []map[string][]string{{"urls": []string{"stun:stun.l.google.com:19302"}}}
}

func whatsappPermissionRequestBody(channel *channelmodel.ChannelWhatsApp) string {
	providerConfig := map[string]any{}
	_ = json.Unmarshal([]byte(channel.ProviderConfig), &providerConfig)
	if body, ok := providerConfig["call_permission_request_body"].(string); ok {
		return body
	}
	return "Please allow WhatsApp calls from this business."
}

type defaultWhatsAppCallProvider struct {
	client *resty.Client
}

func (p defaultWhatsAppCallProvider) InitiateCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, toNumber string, sdpOffer string) (string, error) {
	resp, err := p.call(ctx, channel, map[string]any{"messaging_product": "whatsapp", "to": toNumber, "action": "connect", "session": map[string]any{"sdp_type": "offer", "sdp": sdpOffer}})
	if err != nil {
		return "", err
	}
	if calls, ok := resp["calls"].([]any); ok && len(calls) > 0 {
		if first, ok := calls[0].(map[string]any); ok {
			if id, ok := first["id"].(string); ok {
				return id, nil
			}
		}
	}
	if id, ok := resp["call_id"].(string); ok {
		return id, nil
	}
	return "", fmt.Errorf("Meta initiate_call failed")
}

func (p defaultWhatsAppCallProvider) PreAcceptCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, providerCallID string, sdpAnswer string) error {
	_, err := p.call(ctx, channel, p.callActionBody(providerCallID, "pre_accept", sdpAnswer))
	return err
}

func (p defaultWhatsAppCallProvider) AcceptCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, providerCallID string, sdpAnswer string) error {
	_, err := p.call(ctx, channel, p.callActionBody(providerCallID, "accept", sdpAnswer))
	return err
}

func (p defaultWhatsAppCallProvider) RejectCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, providerCallID string) error {
	_, err := p.call(ctx, channel, map[string]any{"messaging_product": "whatsapp", "call_id": providerCallID, "action": "reject"})
	return err
}

func (p defaultWhatsAppCallProvider) TerminateCall(ctx context.Context, channel *channelmodel.ChannelWhatsApp, providerCallID string) error {
	_, err := p.call(ctx, channel, map[string]any{"messaging_product": "whatsapp", "call_id": providerCallID, "action": "terminate"})
	return err
}

func (p defaultWhatsAppCallProvider) SendCallPermissionRequest(ctx context.Context, channel *channelmodel.ChannelWhatsApp, toNumber string, body string) (string, error) {
	resp, err := p.call(ctx, channel, map[string]any{"messaging_product": "whatsapp", "to": toNumber, "type": "text", "text": map[string]any{"body": body}})
	if err != nil {
		return "", err
	}
	if messages, ok := resp["messages"].([]any); ok && len(messages) > 0 {
		if first, ok := messages[0].(map[string]any); ok {
			if id, ok := first["id"].(string); ok {
				return id, nil
			}
		}
	}
	return "", nil
}

func (p defaultWhatsAppCallProvider) callActionBody(callID string, action string, sdpAnswer string) map[string]any {
	return map[string]any{"messaging_product": "whatsapp", "call_id": callID, "action": action, "session": map[string]any{"sdp_type": "answer", "sdp": sdpAnswer}}
}

func (p defaultWhatsAppCallProvider) call(ctx context.Context, channel *channelmodel.ChannelWhatsApp, body map[string]any) (map[string]any, error) {
	url := fmt.Sprintf("%s/%s/%s/calls", whatsappGraphAPIBase(), whatsappAPIVersion(), channel.PhoneNumberID)
	resp, err := p.client.R().SetContext(ctx).SetAuthToken(channel.AccessToken).SetBody(body).Post(url)
	if err != nil {
		return nil, err
	}
	if resp.StatusCode() >= 200 && resp.StatusCode() < 300 {
		out := map[string]any{}
		_ = json.Unmarshal(resp.Body(), &out)
		return out, nil
	}
	if strings.Contains(string(resp.Body()), "138006") {
		return nil, ErrWhatsAppCallPermissionRequired
	}
	return nil, fmt.Errorf("Meta WhatsApp call API returned status %d", resp.StatusCode())
}