'use strict';

const path = require('path');

const Command = require('../command');
const debug = require('debug')('egg-script:start');
const { execFile } = require('mz/child_process');
const fs = require('mz/fs');
const homedir = require('node-homedir');
const mkdirp = require('mz-modules/mkdirp');
const moment = require('moment');
const sleep = require('mz-modules/sleep');
const spawn = require('child_process').spawn;
const utils = require('egg-utils');

class StartCommand extends Command {
  constructor(rawArgv) {
    super(rawArgv);
    this.usage = 'Usage: egg-scripts start [options] [baseDir]';
    this.serverBin = path.join(__dirname, '../start-cluster');

    this.options = {
      title: {
        description: 'process title description, use for kill grep, default to `egg-server-${APP_NAME}`',
        type: 'string',
      },
      workers: {
        description: 'numbers of app workers, default to `os.cpus().length`',
        type: 'number',
        alias: [ 'c', 'cluster' ],
        default: process.env.EGG_WORKERS,
      },
      port: {
        description: 'listening port, default to `process.env.PORT`',
        type: 'number',
        alias: 'p',
        default: process.env.PORT,
      },
      env: {
        description: 'server env, default to `process.env.EGG_SERVER_ENV`',
        default: process.env.EGG_SERVER_ENV,
      },
      framework: {
        description: 'specify framework that can be absolute path or npm package',
        type: 'string',
      },
      daemon: {
        description: 'whether run at background daemon mode',
        type: 'boolean',
      },
      stdout: {
        description: 'customize stdout file',
        type: 'string',
      },
      stderr: {
        description: 'customize stderr file',
        type: 'string',
      },
      timeout: {
        description: 'the maximum timeout when app starts',
        type: 'number',
        default: 300 * 1000,
      },
      'ignore-stderr': {
        description: 'whether ignore stderr when app starts',
        type: 'boolean',
      },
      node: {
        description: 'customize node command path',
        type: 'string',
      },
    };
  }

  get description() {
    return 'Start server at prod mode';
  }

  * run(context) {
    context.execArgvObj = context.execArgvObj || {};
    const { argv, env, cwd, execArgvObj } = context;
    const HOME = homedir();
    const logDir = path.join(HOME, 'logs');

    // egg-script start
    // egg-script start ./server
    // egg-script start /opt/app
    let baseDir = argv._[0] || cwd;
    if (!path.isAbsolute(baseDir)) baseDir = path.join(cwd, baseDir);
    argv.baseDir = baseDir;

    const isDaemon = argv.daemon;

    argv.framework = yield this.getFrameworkPath({
      framework: argv.framework,
      baseDir,
    });

    this.frameworkName = yield this.getFrameworkName(argv.framework);

    const pkgInfo = require(path.join(baseDir, 'package.json'));
    argv.title = argv.title || `egg-server-${pkgInfo.name}`;

    argv.stdout = argv.stdout || path.join(logDir, 'master-stdout.log');
    argv.stderr = argv.stderr || path.join(logDir, 'master-stderr.log');

    // normalize env
    env.HOME = HOME;
    env.NODE_ENV = 'production';

    // it makes env big but more robust
    env.PATH = env.Path = [
      // for nodeinstall
      path.join(baseDir, 'node_modules/.bin'),
      // support `.node/bin`, due to npm5 will remove `node_modules/.bin`
      path.join(baseDir, '.node/bin'),
      // adjust env for win
      env.PATH || env.Path,
    ].filter(x => !!x).join(path.delimiter);

    // for alinode
    env.ENABLE_NODE_LOG = 'YES';
    env.NODE_LOG_DIR = env.NODE_LOG_DIR || path.join(logDir, 'alinode');
    yield mkdirp(env.NODE_LOG_DIR);

    // cli argv -> process.env.EGG_SERVER_ENV -> `undefined` then egg will use `prod`
    if (argv.env) {
      // if undefined, should not pass key due to `spwan`, https://github.com/nodejs/node/blob/master/lib/child_process.js#L470
      env.EGG_SERVER_ENV = argv.env;
    }

    // additional execArgv
    execArgvObj.deprecation = false; // --no-deprecation
    execArgvObj.traceWarnings = true; // --trace-warnings

    const command = argv.node || 'node';

    const options = {
      execArgv: context.execArgv, // getter for execArgvObj, see https://github.com/node-modules/common-bin/blob/master/lib/command.js#L332
      env,
      stdio: 'inherit',
      detached: false,
    };

    this.logger.info('Starting %s application at %s', this.frameworkName, baseDir);

    // remove unused properties from stringify, alias had been remove by `removeAlias`
    const ignoreKeys = [ '_', '$0', 'env', 'daemon', 'stdout', 'stderr', 'timeout', 'ignore-stderr', 'node' ];
    const clusterOptions = stringify(argv, ignoreKeys);
    // Note: `spawn` is not like `fork`, had to pass `execArgv` youself
    const eggArgs = [ ...(options.execArgv || []), this.serverBin, clusterOptions, `--title=${argv.title}` ];
    this.logger.info('Run node %s', eggArgs.join(' '));

    // whether run in the background.
    if (isDaemon) {
      this.logger.info(`Save log file to ${logDir}`);
      const [ stdout, stderr ] = yield [ getRotatelog(argv.stdout), getRotatelog(argv.stderr) ];
      options.stdio = [ 'ignore', stdout, stderr, 'ipc' ];
      options.detached = true;

      debug('Run spawn `%s %s`', command, eggArgs.join(' '));
      const child = this.child = spawn(command, eggArgs, options);
      this.isReady = false;
      child.on('message', msg => {
        /* istanbul ignore else */
        if (msg && msg.action === 'egg-ready') {
          this.isReady = true;
          this.logger.info('%s started on %s', this.frameworkName, msg.data.address);
          child.unref();
          child.disconnect();
          this.exit(0);
        }
      });

      // check start status
      yield this.checkStatus(argv);
    } else {
      options.stdio = [ 'inherit', 'inherit', 'inherit', 'ipc' ];
      debug('Run spawn `%s %s`', command, eggArgs.join(' '));
      const child = this.child = spawn(command, eggArgs, options);
      child.once('exit', code => {
        // command should exit after child process exit
        this.exit(code);
      });

      // attach master signal to child
      let signal;
      [ 'SIGINT', 'SIGQUIT', 'SIGTERM' ].forEach(event => {
        process.once(event, () => {
          debug('Kill child %s with %s', child.pid, signal);
          child.kill(event);
        });
      });
    }
  }

  * getFrameworkPath(params) {
    return utils.getFrameworkPath(params);
  }

  * getFrameworkName(framework) {
    const pkgPath = path.join(framework, 'package.json');
    let name = 'egg';
    try {
      const pkg = require(pkgPath);
      /* istanbul ignore else */
      if (pkg.name) name = pkg.name;
    } catch (_) {
      /* istanbul next */
    }
    return name;
  }

  * checkStatus({ stderr, timeout, 'ignore-stderr': ignoreStdErr }) {
    let count = 0;
    let hasError = false;
    let isSuccess = true;
    timeout = timeout / 1000;
    while (!this.isReady) {
      try {
        const stat = yield fs.stat(stderr);
        if (stat && stat.size > 0) {
          hasError = true;
          break;
        }
      } catch (_) {
        // nothing
      }

      if (count >= timeout) {
        this.logger.error('Start failed, %ds timeout', timeout);
        isSuccess = false;
        break;
      }

      yield sleep(1000);
      this.logger.log('Wait Start: %d...', ++count);
    }

    if (hasError) {
      try {
        const args = [ '-n', '100', stderr ];
        this.logger.error('tail %s', args.join(' '));
        const [ stdout ] = yield execFile('tail', args);
        this.logger.error('Got error when startup: ');
        this.logger.error(stdout);
      } catch (err) {
        this.logger.error('ignore tail error: %s', err);
      }
      isSuccess = ignoreStdErr;
      this.logger.error('Start got error, see %s', stderr);
      this.logger.error('Or use `--ignore-stderr` to ignore stderr at startup.');
    }

    if (!isSuccess) {
      this.child.kill('SIGTERM');
      yield sleep(1000);
      this.exit(1);
    }
  }
}

function* getRotatelog(logfile) {
  yield mkdirp(path.dirname(logfile));

  if (yield fs.exists(logfile)) {
    // format style: .20150602.193100
    const timestamp = moment().format('.YYYYMMDD.HHmmss');
    // Note: rename last log to next start time, not when last log file created
    yield fs.rename(logfile, logfile + timestamp);
  }

  return yield fs.open(logfile, 'a');
}

function stringify(obj, ignore) {
  const result = {};
  Object.keys(obj).forEach(key => {
    if (!ignore.includes(key)) {
      result[key] = obj[key];
    }
  });
  return JSON.stringify(result);
}

module.exports = StartCommand;