/*
 * Copyright (C) SapphireCode - All Rights Reserved
 * This file is part of Snippeteer which is released under BSD-3-Clause.
 * See file 'LICENSE' for full license details.
 * Created by Timo Hocker <timo@scode.ovh>, May 2020
 */

import { Persistent } from '@sapphirecode/modelling';
import { PatchAction } from '../classes/PatchAction';
import { Database } from '../classes/Database';

export class RenameColumn extends Persistent implements PatchAction {
  public get table (): string {
    return this.get ('table');
  }

  public get column (): string {
    return this.get ('column');
  }

  public get new_name (): string {
    return this.get ('new_name');
  }

  public constructor (
    column: string,
    new_name: string|null = null,
    table: string|null = null
  ) {
    this.properties = { column: 'string', table: 'string', new_name: 'string' };

    if (new_name === null || table === null) {
      const parsed = JSON.parse (column);
      this.assign_object (parsed);
      return;
    }

    this.set ('column', column);
    this.set ('new_name', new_name);
    this.set ('table', table);
  }

  public apply (db: Database): void {
    const table = db.get_table (this.table);
    if (typeof table === 'undefined' || table === null) {
      throw new Error (
        `table ${this.table} not found`
      );
    }
    const column = table.get_column (this.column);
    if (typeof column === 'undefined' || column === null) {
      throw new Error (
        `column ${this.column} not found in table ${this.table}`
      );
    }

    column.name = this.new_name;
  }
}