import { dataSource } from "../data-source";
import { DynamicQueryStructure } from "../type/dynamicQueries";

export default abstract class DynamicQueryBuilder {
  public static buildQuery(query: DynamicQueryStructure) {}

  // use switch... for compare functions
  // use NotBrackets/Brackets for nested conditions
  // use joins by requesting table schema and setting correct column

  public static getTableMeta(tableName: string) {
    let { name, columns, relations } = dataSource.getMetadata(tableName);

    const uniqueColumns = columns.map((c) => ({ column: c.propertyName, type: c.type }));

    return {
      tableName: name,
      columns: [
        ...uniqueColumns,
        ...relations
          .filter((r) => !uniqueColumns.some((c) => r.propertyName == c.column))
          .map((r) => ({
            column: r.propertyName,
            type: r.inverseEntityMetadata?.columns.find((col) => col.propertyName === r.inverseSidePropertyPath)?.type,
          })),
      ],
      relations: relations.map((r) => ({
        column: r.propertyName,
        relationType: r.relationType,
        referencedTableName: r.inverseEntityMetadata?.tableName,
      })),
    };
  }
}