#!/usr/bin/env node

// 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.


var cp = require('child_process');
var log = require('./console').log;

function watchInspector(child) {

  child.stderr.on('data', function(body) {
    log('Inspector STDERR: %s', body);
  });

  child.stdout.on('data', function(body) {
    log('Inspector STDOUT: %s', body);
  });

  child.on('exit', function(code, signal) {
    log('Inspector exited %d signal=%j', code, signal);
    process.exit(code);
  });

  process.on('exit', function() {
    log('Kill inspector upon exit: %d', child.pid);
    process.kill(child.pid, 'SIGTERM');
  });

}

function start (debugPort) {

  if (!debugPort || typeof debugPort !== 'number') {
    throw new Error('Need a listen debugPort');
  }

  var webPort = debugPort + 1;
  var cmd = __filename;
  var args = [debugPort, webPort];
  var opts = {
    'cwd': __dirname,
    'stdio': 'pipe',
    'detached': false
  };

  log('Start inspector: %s %j %j', cmd, args, opts);

  var inspector = cp.spawn(cmd, args, opts);

  watchInspector(inspector);

  log('Enable remote debug pid=%d port=%d', process.pid, debugPort);

  process.debugPort = debugPort;
  process.kill(process.pid, 'SIGUSR1');
}

function main() {
  var debugPort = +process.argv[2];
  var webPort = +process.argv[3];

  if (!debugPort || !webPort) {
    throw new Error('Bad arguments: need debugPort and webPort');
  }

  console.log('Start inspector debugPort=%j webPort=%j', debugPort, webPort);

  var DebugServer = require('node-inspector/lib/debug-server');
  var server = new DebugServer();

  server.on('close', function() {
    console.log('Server closed');
    process.exit(0);
  });

  server.start({
    'webPort':webPort,
    'debugPort':debugPort
  });

  process.on('uncaughtException', function(er) {
    console.log('Error:\n%s', er.stack);
  });
}

module.exports = start;

if (require.main === module) {
  main();
}