package document

import (
	"context"

	"github.com/google/uuid"
)

// GetSummary returns minimal document identification info.
func (s *Service) GetSummary(ctx context.Context, id uuid.UUID) (*DocumentSummary, error) {
	doc, err := s.cfg.GetDBQueries().GetDocumentSummary(ctx, id)
	if err != nil {
		return nil, err
	}

	return &DocumentSummary{
		ID:       doc.ID,
		ClientID: doc.Clientid,
		Hash:     doc.Hash,
	}, nil
}

// GetExternal returns document info for external API responses.
// Note: Query functionality (Fields) has been removed. See remove_query_plan.md for details.
func (s *Service) GetExternal(ctx context.Context, id uuid.UUID) (*DocumentExternal, error) {
	doc, err := s.cfg.GetDBQueries().GetDocumentExternal(ctx, id)
	if err != nil {
		return nil, err
	}

	return &DocumentExternal{
		Id:       doc.ID,
		ClientID: doc.Clientid,
		Hash:     doc.Hash,
	}, nil
}

// GetEnriched returns full document details including metadata, labels, and optionally the text record.
// Parameters:
//   - ctx: context for the operation
//   - id: document UUID
//   - includeTextRecord: if true, fetches and includes the full field extraction response
//
// Returns DocumentEnriched with all metadata, or error if document not found or other failure.
// Note: Query functionality (Fields) has been removed. See remove_query_plan.md for details.
func (s *Service) GetEnriched(ctx context.Context, id uuid.UUID, includeTextRecord bool) (*DocumentEnriched, error) {
	queries := s.cfg.GetDBQueries()

	// 1. Get basic document info
	docExternal, err := queries.GetDocumentExternal(ctx, id)
	if err != nil {
		return nil, err
	}

	// 2. Get extended document metadata (folder, filename, originalPath)
	docEnriched, err := queries.GetDocumentEnriched(ctx, id)
	if err != nil {
		return nil, err
	}

	// 3. Check if text record exists
	hasTextRecord, err := queries.HasFieldExtraction(ctx, id)
	if err != nil {
		return nil, err
	}

	// 4. Get labels for document
	dbLabels, err := queries.GetDocumentLabels(ctx, id)
	if err != nil {
		return nil, err
	}

	labels := make([]LabelRecord, len(dbLabels))
	for i, lbl := range dbLabels {
		labels[i] = LabelRecord{
			ID:         lbl.ID,
			DocumentID: lbl.Documentid,
			Label:      lbl.Label,
			AppliedBy:  lbl.Appliedby,
			AppliedAt:  lbl.Appliedat.Time,
		}
	}

	result := &DocumentEnriched{
		ID:                docExternal.ID,
		ClientID:          docExternal.Clientid,
		Hash:              docExternal.Hash,
		HasTextRecord:     hasTextRecord,
		FolderID:          docEnriched.Folderid,
		Filename:          docEnriched.Filename,
		OriginalPath:      docEnriched.Originalpath,
		Labels:            labels,
		FileSizeBytes:     docEnriched.FileSizeBytes,
		CustomSchemaID:    docEnriched.CustomSchemaID,
		HasCustomMetadata: docEnriched.HasCustomMetadata,
	}

	// 5. Optionally fetch full text record if requested and exists
	if includeTextRecord && hasTextRecord {
		textRecord, err := s.getTextRecord(ctx, id)
		if err != nil {
			// Log but don't fail - text record is optional enhancement
			// Could add logging here if needed
			return result, nil
		}
		result.TextRecord = textRecord
	}

	return result, nil
}

// getTextRecord fetches the current field extraction for a document.
// Returns nil if no extraction exists.
func (s *Service) getTextRecord(ctx context.Context, documentID uuid.UUID) (*TextRecord, error) {
	queries := s.cfg.GetDBQueries()

	current, err := queries.GetCurrentFieldExtraction(ctx, documentID)
	if err != nil {
		return nil, err
	}

	if current == nil {
		return nil, nil
	}

	// Get array fields
	arrayFields, err := queries.GetFieldExtractionArrayFields(ctx, current.ID)
	if err != nil {
		return nil, err
	}

	return &TextRecord{
		ID:         current.ID,
		DocumentID: current.Documentid,
		//nolint:gosec // Version is a small number, int32 is sufficient
		Version:      int32(current.Version),
		SingleFields: current,     // Pass the whole struct - handler will convert
		ArrayFields:  arrayFields, // Pass array fields - handler will convert
		CreatedAt:    current.Createdat.Time,
		CreatedBy:    current.Createdby,
	}, nil
}