package service

import (
	"context"
	"errors"

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/repository"
	applogger "github.com/gochat/gochat/pkg/logger"
)

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

// NewWhatsAppCallService creates a new WhatsAppCall service.
func NewWhatsAppCallService(repo *repository.WhatsAppCallRepo) *WhatsAppCallService {
	return &WhatsAppCallService{repo: repo}
}

// 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
}