package service

import (
	"context"
	"encoding/json"
	"fmt"
	"sync"

	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/worker"
)

const TaskTypeContactExport = "contact:export"

type contactExportJob struct {
	ExportID uint `json:"export_id"`
}

var contactExportRegistrations sync.Map

// RegisterContactExportJobs wires Chatwoot Account::ContactsExportJob into the
// durable worker. Handlers are registered once per WorkerPool instance.
func RegisterContactExportJobs(wp *worker.WorkerPool, svc *ContactService) {
	if wp == nil || svc == nil {
		return
	}
	if _, loaded := contactExportRegistrations.LoadOrStore(wp, struct{}{}); loaded {
		return
	}
	wp.Register(TaskTypeContactExport, svc.performContactExportJob)
}

func (s *ContactService) performContactExportJob(ctx context.Context, job *model.BackgroundJob) error {
	var payload contactExportJob
	if err := json.Unmarshal(job.Payload, &payload); err != nil {
		return fmt.Errorf("unmarshal contact export job: %w", err)
	}
	if payload.ExportID == 0 {
		return fmt.Errorf("invalid contact export job payload: %#v", payload)
	}
	_, err := s.performContactExport(ctx, payload.ExportID)
	return err
}