// Package webhook provides webhook handling services.
package webhook

import (
	"context"
	"database/sql"
	"fmt"
	"log/slog"

	"go.uber.org/fx"

	"sneak.berlin/go/upaas/internal/database"

	"sneak.berlin/go/upaas/internal/logger"
	"sneak.berlin/go/upaas/internal/models"
	"sneak.berlin/go/upaas/internal/service/deploy"
)

// ServiceParams contains dependencies for Service.
type ServiceParams struct {
	fx.In

	Logger   *logger.Logger
	Database *database.Database
	Deploy   *deploy.Service
}

// Service provides webhook handling functionality.
type Service struct {
	log    *slog.Logger
	db     *database.Database
	deploy *deploy.Service
	params *ServiceParams
}

// New creates a new webhook Service.
func New(_ fx.Lifecycle, params ServiceParams) (*Service, error) {
	return &Service{
		log:    params.Logger.Get(),
		db:     params.Database,
		deploy: params.Deploy,
		params: &params,
	}, nil
}

// HandleWebhook processes a webhook request from any supported source
// (Gitea, GitHub, or GitLab). The source parameter determines which
// payload format to use for parsing.
func (svc *Service) HandleWebhook(
	ctx context.Context,
	app *models.App,
	source Source,
	eventType string,
	payload []byte,
) error {
	svc.log.Info("processing webhook",
		"app", app.Name,
		"source", source.String(),
		"event", eventType,
	)

	// Parse payload into normalized push event
	pushEvent, parseErr := ParsePushPayload(source, payload)
	if parseErr != nil {
		svc.log.Warn("failed to parse webhook payload",
			"error", parseErr,
			"source", source.String(),
		)
		// Continue with empty push event to still log the webhook
		pushEvent = &PushEvent{Source: source}
	}

	// Check if branch matches
	matched := pushEvent.Branch == app.Branch

	// Create webhook event record
	event := models.NewWebhookEvent(svc.db)
	event.AppID = app.ID
	event.EventType = eventType
	event.Branch = pushEvent.Branch
	event.CommitSHA = sql.NullString{String: pushEvent.After, Valid: pushEvent.After != ""}
	event.CommitURL = sql.NullString{
		String: pushEvent.CommitURL.String(),
		Valid:  pushEvent.CommitURL != "",
	}
	event.Payload = sql.NullString{String: string(payload), Valid: true}
	event.Matched = matched
	event.Processed = false

	saveErr := event.Save(ctx)
	if saveErr != nil {
		return fmt.Errorf("failed to save webhook event: %w", saveErr)
	}

	svc.log.Info("webhook event recorded",
		"app", app.Name,
		"source", source.String(),
		"branch", pushEvent.Branch,
		"matched", matched,
		"commit", pushEvent.After,
	)

	// If branch matches, trigger deployment
	if matched {
		svc.triggerDeployment(ctx, app, event)
	}

	return nil
}

func (svc *Service) triggerDeployment(
	ctx context.Context,
	app *models.App,
	event *models.WebhookEvent,
) {
	// Capture values for goroutine
	eventID := event.ID
	appName := app.Name

	go func() {
		// Use context.WithoutCancel to ensure deployment completes
		// even if the HTTP request context is cancelled.
		deployCtx := context.WithoutCancel(ctx)

		deployErr := svc.deploy.Deploy(deployCtx, app, &eventID, true)
		if deployErr != nil {
			svc.log.Error("deployment failed", "error", deployErr, "app", appName)
		}

		// Mark event as processed
		event.Processed = true
		_ = event.Save(deployCtx)
	}()
}