/**
 * Copyright 2017 Oursky Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import chalk from 'chalk';
import _ from 'lodash';
import {
  Arguments as YargsArguments,
  CommandModule as YargsCommandModule
} from 'yargs';

export interface Arguments extends YargsArguments {
  debug: boolean;
  verbose: boolean;
  environment: string;
}

export interface CommandModule extends YargsCommandModule {
  execute?(argv: Arguments): Promise<void>;
  handler(argv: Arguments): Promise<void>;
}

export function createCommand(module: CommandModule) {
  return _.assign({}, module, {
    handler: (argv: Arguments) => {
      const p = module.handler(argv);
      if (p && typeof p.catch === 'function') {
        p.catch((err: Error | string) => {
          if (err) {
            if (typeof err === 'object') {
              err = JSON.stringify(err);
            }
            console.log(chalk.red(err));
          }
          process.exit(1);
        });
      }
    },
    execute: module.handler
  });
}

export function executeCommand(module: CommandModule, argv: Arguments) {
  return module.execute(argv);
}