import { CommandParser } from '../client/parser';
import { RedisArgument, SimpleStringReply, Command } from '../RESP/types';
import { AuthOptions } from './AUTH';

export interface MigrateOptions {
  COPY?: true;
  REPLACE?: true;
  AUTH?: AuthOptions;
}

export default {
  IS_READ_ONLY: false,
  /**
   * Constructs the MIGRATE command
   * 
   * @param parser - The command parser
   * @param host - Target Redis instance host
   * @param port - Target Redis instance port
   * @param key - Key or keys to migrate
   * @param destinationDb - Target database index
   * @param timeout - Timeout in milliseconds
   * @param options - Optional parameters including COPY, REPLACE, and AUTH
   * @see https://redis.io/commands/migrate/
   */
  parseCommand(
    parser: CommandParser,
    host: RedisArgument,
    port: number,
    key: RedisArgument | Array<RedisArgument>,
    destinationDb: number,
    timeout: number,
    options?: MigrateOptions
  ) {
    parser.push('MIGRATE', host, port.toString());
    const isKeyArray = Array.isArray(key);
  
    if (isKeyArray) {
      parser.push('');
    } else {
      parser.push(key);
    }
  
    parser.push(
      destinationDb.toString(),
      timeout.toString()
    );
  
    if (options?.COPY) {
      parser.push('COPY');
    }
  
    if (options?.REPLACE) {
      parser.push('REPLACE');
    }
  
    if (options?.AUTH) {
      if (options.AUTH.username) {
        parser.push(
          'AUTH2',
          options.AUTH.username,
          options.AUTH.password
        );
      } else {
        parser.push(
          'AUTH',
          options.AUTH.password
        );
      }
    }
  
    if (isKeyArray) {
      parser.push('KEYS');
      parser.pushVariadic(key);
    }
  },
  transformReply: undefined as unknown as () => SimpleStringReply<'OK'>
} as const satisfies Command;