var platform = require('os').platform;
var install_process = require('child_process');
var path = require('path');
var errors = new global.Messages().errors;

global.installer = function() {
  var RELEASE = 'zxp/release.zxp';
  var CMD_PREFIX = platform() == 'darwin' ? '--' : '/';

  var target_path = function() {
    var pathToBin;
    switch (platform()) {
      case 'darwin':
        pathToBin = 'bin/OSX/Contents/MacOS/ExManCmd';
        break;
      case 'win32':
        pathToBin = 'bin/WINDOWS/ExManCmd.exe';
      case 'win64':
        pathToBin = 'bin/WINDOWS/ExManCmd.exe';
    }
    return pathToBin;
  };

  return {
    install: function(zxpPath) {
      console.log('using target path of ' + target_path());
      console.log('starting to install ZXP from path ' + zxpPath);

      return (promise = new Promise(function(resolve, reject) {
        var closeMessage = '';

        var spawn = install_process.spawn(path.join(__dirname, target_path()), [
          CMD_PREFIX + 'install',
          path.join(__dirname, zxpPath)
        ]);

        spawn.stdout.on('data', function(data) {
          console.log('stdout: ' + data.toString());
          var logbits = /= -(\d+)/.exec(data.toString());
          var code = logbits && logbits[1] ? parseInt(logbits[1]) : null;
          if (code)
            closeMessage = errors.get(code) || 'Error: ' + data.toString();
        });

        spawn.stderr.on('data', function(data) {
          console.log('stderr: ' + data.toString());
          var logbits = /(\d{4}-\d{2}-\d{2}) (\d{2}:\d{2}:\d{2}) : ([A-Z]+)\s+(.*)/.exec(
            data.toString()
          );
          var date = logbits[1];
          var time = logbits[2];
          var level = logbits[3];
          var message = logbits[4];
          if (level === 'ERROR') {
            reject(message);
          }
        });

        // code 0 => success
        spawn.on('exit', function(code) {
          if (code == 0) {
            resolve();
          } else {
            reject(closeMessage);
          }
        });
      }));
    }
  };
};