package automation

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

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

type automationWebhookDeliveryJob struct {
	AccountID      uint                   `json:"account_id"`
	ConversationID uint                   `json:"conversation_id"`
	EventName      string                 `json:"event_name"`
	URL            string                 `json:"url"`
	Payload        map[string]interface{} `json:"payload"`
}

type automationTranscriptDeliveryJob struct {
	AccountID      uint   `json:"account_id"`
	ConversationID uint   `json:"conversation_id"`
	Recipient      string `json:"recipient"`
}

type automationTeamEmailDeliveryJob struct {
	AccountID      uint   `json:"account_id"`
	ConversationID uint   `json:"conversation_id"`
	TeamID         uint   `json:"team_id"`
	Message        string `json:"message"`
}

var actionDeliveryRegistrations sync.Map

// RegisterActionDeliveryJobs wires Chatwoot-style automation external side
// effects into the durable worker. Callers may invoke this repeatedly; worker
// handlers are idempotently registered per WorkerPool instance.
func RegisterActionDeliveryJobs(wp *worker.WorkerPool, db DBProvider) {
	if wp == nil || db == nil {
		return
	}
	if _, loaded := actionDeliveryRegistrations.LoadOrStore(wp, struct{}{}); loaded {
		return
	}
	runner := &actionDeliveryJobRunner{
		db:                  db,
		webhookDeliverer:    defaultWebhookDelivererFactory(),
		transcriptDeliverer: defaultTranscriptDelivererFactory(),
	}
	wp.Register(TaskTypeAutomationWebhookDelivery, runner.performWebhookDelivery)
	wp.Register(TaskTypeAutomationTranscriptDelivery, runner.performTranscriptDelivery)
	wp.Register(TaskTypeAutomationTeamEmailDelivery, runner.performTeamEmailDelivery)
}

type actionDeliveryJobRunner struct {
	db                  DBProvider
	webhookDeliverer    AutomationWebhookDeliverer
	transcriptDeliverer AutomationTranscriptDeliverer
}

func (r *actionDeliveryJobRunner) performWebhookDelivery(ctx context.Context, job *model.BackgroundJob) error {
	var payload automationWebhookDeliveryJob
	if err := json.Unmarshal(job.Payload, &payload); err != nil {
		return fmt.Errorf("unmarshal automation webhook job: %w", err)
	}
	_, err := r.webhookDeliverer.DeliverWebhook(ctx, AutomationWebhookRequest{
		AccountID:      payload.AccountID,
		ConversationID: payload.ConversationID,
		EventName:      payload.EventName,
		URL:            payload.URL,
		Payload:        payload.Payload,
	})
	return err
}

func (r *actionDeliveryJobRunner) performTranscriptDelivery(ctx context.Context, job *model.BackgroundJob) error {
	var payload automationTranscriptDeliveryJob
	if err := json.Unmarshal(job.Payload, &payload); err != nil {
		return fmt.Errorf("unmarshal automation transcript job: %w", err)
	}
	subject, body, err := NewActionService(r.db).buildTranscriptEmail(ctx, payload.AccountID, payload.ConversationID)
	if err != nil {
		return err
	}
	_, err = r.transcriptDeliverer.DeliverTranscript(ctx, AutomationTranscriptRequest{
		AccountID:      payload.AccountID,
		ConversationID: payload.ConversationID,
		Recipient:      payload.Recipient,
		Subject:        subject,
		Body:           body,
	})
	return err
}

func (r *actionDeliveryJobRunner) performTeamEmailDelivery(ctx context.Context, job *model.BackgroundJob) error {
	var payload automationTeamEmailDeliveryJob
	if err := json.Unmarshal(job.Payload, &payload); err != nil {
		return fmt.Errorf("unmarshal automation team email job: %w", err)
	}
	requests, err := NewActionService(r.db).buildTeamEmailRequests(ctx, payload.AccountID, payload.ConversationID, []uint{payload.TeamID}, payload.Message)
	if err != nil {
		return err
	}
	for _, req := range requests {
		if _, err := r.transcriptDeliverer.DeliverTranscript(ctx, req); err != nil {
			return err
		}
	}
	return nil
}