package doccleanrunner

import (
	"context"
	"log/slog"

	"queryorchestration/internal/database/repository"
	"queryorchestration/internal/document/batch/foldercleanup"
	"queryorchestration/internal/document/batch/outcome"
	documentclean "queryorchestration/internal/document/clean"

	"github.com/google/uuid"
)

const Name = "docCleanRunner"

// Services holds the dependencies for the docCleanRunner.
//
// Fields:
//   - Clean: service for cleaning/validating documents
//   - Outcome: reporter for writing batch pipeline outcomes
type Services struct {
	Clean   *documentclean.Service
	Outcome *outcome.Reporter
	Cleanup *foldercleanup.Service
}

// Runner processes document clean messages from the SQS queue.
type Runner struct {
	svc *Services
}

// New creates a new docCleanRunner.
//
// Parameters:
//   - svc: the runner's service dependencies
//
// Returns:
//   - Runner: the runner instance
func New(svc *Services) Runner {
	return Runner{
		svc: svc,
	}
}

// Body is the SQS message body for docCleanRunner.
type Body struct {
	DocumentID uuid.UUID `json:"id" validate:"required,uuid"`
}

// Process handles a single document clean message. Returns true to acknowledge
// the message (success or validation failure), or false to requeue (infrastructure error).
// Validation failures are acknowledged (not requeued) to prevent infinite retry loops
// for permanently-invalid documents.
func (s Runner) Process(ctx context.Context, body Body) bool {
	result, err := s.svc.Clean.Clean(ctx, body.DocumentID)
	if err != nil {
		slog.Error("unable to process", "error", err)
		return false // infrastructure error -> requeue
	}

	outcomeName := repository.BatchOutcomeStatusCleanPassed
	var errorDetail *string
	if !result.Passed {
		outcomeName = repository.BatchOutcomeStatusCleanFailed
		errorDetail = result.FailReason
	}
	batchIDs, updateErr := s.svc.Outcome.Update(ctx, body.DocumentID, outcomeName, errorDetail)
	if updateErr != nil {
		slog.Error("failed to update batch outcome",
			"document_id", body.DocumentID, "outcome", outcomeName, "error", updateErr)
	}
	if s.svc.Cleanup != nil {
		for _, batchID := range batchIDs {
			if _, err := s.svc.Cleanup.TryFinalizeBatch(ctx, batchID); err != nil {
				slog.Error("failed to finalize batch folder cleanup", "batch_id", batchID, "error", err)
			}
		}
	}

	return true // validation pass or fail -> acknowledge (don't requeue bad PDFs)
}