package documenttext

import (
	"context"
	"database/sql"
	"errors"
	"fmt"

	"queryorchestration/internal/database/repository"
	"queryorchestration/internal/document"
	"queryorchestration/internal/serviceconfig/build"

	"github.com/google/uuid"
)

type extraction struct {
	TextLocation document.Location
	Hash         string
}

func (s *Service) executeExtraction(ctx context.Context, cleanId uuid.UUID) (*extraction, error) {
	entry, err := s.cfg.GetDBQueries().GetCleanEntry(ctx, cleanId)
	if err != nil {
		return nil, err
	} else if entry.Fail.Valid {
		return nil, fmt.Errorf("no valid cleaning")
	}

	// analysis, detection - diff?
	// split page by page?
	// output format
	// index
	// pages
	// block types

	return &extraction{
		Hash: "example",
		TextLocation: document.Location{
			Bucket: *entry.Bucket,
			Key:    *entry.Key,
		},
	}, nil
}

func (s *Service) extract(ctx context.Context, cleanId uuid.UUID) error {
	details, err := s.executeExtraction(ctx, cleanId)
	if err != nil {
		return err
	}

	err = s.storeExtraction(ctx, cleanId, details)
	if err != nil {
		return err
	}

	return nil
}

func (s *Service) storeExtraction(ctx context.Context, cleanId uuid.UUID, details *extraction) error {
	version := build.GetVersionUnixTimestamp()

	return s.cfg.ExecuteDBTransaction(ctx, func(ctx context.Context, q *repository.Queries) error {
		existing, err := q.GetDocumentTextExtractionByHash(ctx, &repository.GetDocumentTextExtractionByHashParams{
			Hash:         details.Hash,
			Cleanentryid: cleanId,
		})
		if err != nil && !errors.Is(err, sql.ErrNoRows) {
			return err
		}

		var textId uuid.UUID
		if existing == nil || errors.Is(err, sql.ErrNoRows) {
			newTextId, err := q.AddDocumentText(ctx, &repository.AddDocumentTextParams{
				Bucket:       details.TextLocation.Bucket,
				Key:          details.TextLocation.Key,
				Cleanentryid: cleanId,
				Hash:         details.Hash,
			})
			if err != nil {
				return err
			}

			textId = newTextId
		} else {
			textId = existing.ID
		}

		err = q.AddDocumentTextEntry(ctx, &repository.AddDocumentTextEntryParams{
			Version: version,
			Textid:  textId,
		})
		if err != nil {
			return err
		}

		return nil
	})
}