package docinitrunner

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

	"queryorchestration/internal/database/repository"
	"queryorchestration/internal/document/batch/outcome"
	documentinit "queryorchestration/internal/document/init"
	"queryorchestration/internal/serviceconfig/objectstore"

	"github.com/google/uuid"
)

const Name = "docInitRunner"

// Services holds the dependencies for the docInitRunner.
//
// Fields:
//   - Document: service for creating/deduplicating documents
//   - Queries: SQLC-generated database queries
//   - Outcome: reporter for writing batch pipeline outcomes
type Services struct {
	Document *documentinit.Service
	Queries  *repository.Queries
	Outcome  *outcome.Reporter
}

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

// New creates a new docInitRunner.
//
// 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 docInitRunner.
type Body struct {
	Bucket string `json:"bucket" validate:"required"`
	Key    string `json:"key" validate:"required"`
	Hash   string `json:"hash" validate:"required"`
}

// Process handles a single document init message. Returns true to acknowledge
// the message (success), or false to requeue (infrastructure error).
func (s Runner) Process(ctx context.Context, body Body) bool {
	key, err := objectstore.ParseBucketKey(body.Key)
	if err != nil {
		slog.Error("unable to parse key", "key", body.Key, "error", err)
		return false
	}

	// Get filename and folder_id from documentUploads table
	var filename *string
	var folderID *uuid.UUID
	upload, err := s.svc.Queries.GetDocumentUploadByKey(ctx, &repository.GetDocumentUploadByKeyParams{
		Bucket: body.Bucket,
		Key:    body.Key,
	})
	if err != nil && !errors.Is(err, sql.ErrNoRows) {
		slog.Error("unable to get document upload", "bucket", body.Bucket, "key", body.Key, "error", err)
		return false
	}
	if err == nil {
		if upload.Filename != nil {
			filename = upload.Filename
		}
		folderID = upload.FolderID
	}

	result, err := s.svc.Document.Create(ctx, &documentinit.Create{
		Key:          key,
		Bucket:       body.Bucket,
		Hash:         body.Hash,
		Filename:     filename,
		OriginalPath: filename, // For batch uploads, filename contains the full original path
		FolderID:     folderID,
	})
	if err != nil {
		return false
	}
	slog.Debug("created document", "id", result.ID, "filename", filename, "folder_id", folderID)

	// Report outcome for batch documents
	outcomeName := repository.BatchOutcomeStatusInitComplete
	if result.IsDuplicate {
		outcomeName = repository.BatchOutcomeStatusInitDuplicate
	}
	var resolveFilename string
	if result.Filename != nil {
		resolveFilename = *result.Filename
	}
	if resolveErr := s.svc.Outcome.Resolve(ctx, result.BatchID, resolveFilename,
		result.ID, outcomeName, nil); resolveErr != nil {
		slog.Error("failed to resolve batch outcome",
			"document_id", result.ID, "outcome", outcomeName, "error", resolveErr)
		// Non-fatal: document was created successfully
	}

	return true
}