package database

import (
	"context"
	"log/slog"

	"github.com/jackc/pgx/v5"
	"golang.org/x/crypto/blake2b"

	"git.jmbit.de/jmb/scanfile/server/internal/sqlc"
	"git.jmbit.de/jmb/scanfile/server/internal/store"
)

// CreateFile() creates the filesystem object and the DB entry for a file
func CreateFile(ctx context.Context, name string, fileBytes []byte) (sqlc.File, error) {
  queries := sqlc.New(pool)
	file := sqlc.File{
		Name: name,
	}
  var err error

  bl2hash := blake2b.Sum256(fileBytes)
  file.Blake2 = bl2hash[:]
  file.Size = int64(len(fileBytes))

  file.Mimetype, _ = store.GetBytesFileType(fileBytes[:262])

	file, err = queries.CreateFile(ctx, sqlc.CreateFileParams{})
  if err == pgx.ErrNoRows {
    slog.Info("File already exists", "file-uuid", file.ID.String())
    return file, nil
  }
  if err != nil {
    slog.Error("Error saving file to database", "error", err, "file-name", name)
    err = nil
  }


  //Using UUIDs instead of the file hash to make switching storage backends easier
	_, err = store.SaveFile(file.ID.String(), fileBytes)
	if err != nil {
    slog.Error("Error saving file to disk", "error", err, "file-uuid", file.ID.String())
    errdel := queries.DeleteFile(ctx, file.ID)
    if errdel != nil {
      slog.Error("Error deleting file from database", "error", errdel, "file-uuid", file.ID.String())
    }
		return file, err
	}

	return file, nil
}