var http = require('http');
var fs = require('fs');
var path = require('path');
var tls = require('tls');
var httpsOverHttp = require('hagent').agent.httpsOverHttp;
var parseUrl = require('url').parse;
var httpsAgent = require('https').Agent;
var httpAgent = require('http').Agent;
var WebSocket = require('ws');
var events = require('./events');
var config = require('./config.test');
var request = require('request');
var requestProxy = request.defaults({
  proxy : 'http://127.0.0.1:' + config.port
});
var count = 0;
var end;
exports.setEnd = function() {
  end = true;
};

function exit() {
  if (--count <= 0) {
    if (end) {
      process.exit(0);
    } else {
      events.emit('next');
    }
  }
}

function setHost(fullUrl, opts) {
  var host = opts.host;
  if (host || opts.port > 0) {
    var urlOpts = parseUrl(fullUrl);
    host = host || urlOpts.hostname;
    var port = opts.port || urlOpts.port;
    if (port) {
      host = host + ':' + port;
    }
    fullUrl = fullUrl.replace(/\/\/[^/]+/, '//' + host);
  }
  return fullUrl.replace(/^ws/, 'http');
}

exports.requestWS = function(url, callback) {
  ++count;
  var options = parseUrl(url);
  var ws = new WebSocket(setHost(url, { host: '127.0.0.1', port: config.port }), {
    headers: { host: options.host },
    rejectUnauthorized: true
  });
  var done;
  ws.on('open', function open() {
    if (/checkStatusCode/.test(url)) {
      if (done) {
        return;
      }
      done = true;
      callback && callback('checkStatusCode');
      exit();
    } else {
      ws.send('something');
    }
  });
  ws.on('message', function(data) {
    if (done) {
      return;
    }
    done = true;
    callback && callback(JSON.parse(data));
    exit();
  });
};

exports.request = function(options, callback) {
  ++count;

  if (/^ws/.test(options)) {
    var url = options;
    var opts = parseUrl(url);
    var isSsl = /^wss:/.test(url);
    require('../lib/config').connect({
      proxyHost: '127.0.0.1',
      proxyPort: config.port,
      host: opts.hostname,
      port: opts.port || (isSsl ? 443 : 80),
      headers: {
        host: opts.host,
        'proxy-connection': 'keep-alive'
      }
    }, function(socket) {
      var agent = isSsl ? new httpsAgent() : httpAgent();
      if (isSsl) {
        socket = tls.connect({
          rejectUnauthorized: false,
          socket: socket,
          servername: opts.hostname
        });
      }
      agent.createConnection = function() {
        return socket;
      };
      var ws = new WebSocket(url, {
        agent: agent,
        rejectUnauthorized: true
      });

      ws.on('open', function open() {
        ws.send('something');
      });
      var done;
      ws.on('message', function(data) {
        if (done) {
          return;
        }
        done = true;
        callback && callback(JSON.parse(data));
        exit();
      });
    });
  } else {
    if (typeof options == 'string') {
      options = {
        url: options,
        rejectUnauthorized : false
      };
    }
    if (options.isTunnel) {
      options.agent = httpsOverHttp({
        proxy: {
          host: '127.0.0.1',
          port: config.port,
          url: options.url,
          headers: {
            host: parseUrl(options.url).host,
            'x-whistle-policy': 'tunnel'
          }
        },
        rejectUnauthorized: false
      });
    }
    (options.isTunnel ? request : requestProxy)(options, function(err, res, body) {
      try {
        callback && callback(res, /\?resBody=/.test(options.url) ? body : (/doNotParseJson/.test(options.url) ? body : JSON.parse(body)), err);
      } catch(e) {
        /*eslint no-console: "off"*/
        console.log(options);
        throw e;
      }
      exit();
    });
  }
};

function noop() {}

exports.noop = noop;

function getTextBySize(size) {

  return new Array(size + 1).join('1');
}

exports.getTextBySize = getTextBySize;

function connect(host, port, callback) {
  var done;
  var execCallback = function(err, socket) {
    if (done) {
      return;
    }
    done = true;
    callback(err, socket);
  };
  var req = http.request({
    method: 'CONNECT',
    host: '127.0.0.1',
    port: config.port,
    agent: false,
    headers: {
      'user-agent': 'test/whistle',
      'proxy-connection': 'keep-alive',
      'x-whistle-policy': 'tunnel',
      host: host + (port ? ':' + port : '')
    }
  });
  req.on('error', execCallback);
  req.on('connect', function (res, socket, head) {
    execCallback(null, socket);
  });
  req.end();
}

function proxy(url, callback) {
  ++count;
  var options = parseUrl(url);
  connect(options.hostname, options.port, function(err, socket) {
    if (err) {
      if (callback) {
        callback(err);
      } else {
        throw err;
      }
      exit();
      return;
    }

    options.createConnection = function() {
      return socket;
    };

    http.request(options, function(res) {
      if (callback) {
        res.on('data', noop);
        var done;
        res.on('error', function(err) {
          if (done) {
            return;
          }
          done = true;
          callback(err, res);
          exit();
        });
        res.on('end', function() {
          if (done) {
            return;
          }
          done = true;
          callback(err, res);
          exit();
        });
      } else {
        exit();
      }
    }).end();
  });
}

exports.proxy = proxy;

function getValues() {
  var values = {};
  var dir = path.join(__dirname, 'assets/values');
  fs.readdirSync(dir).map(function(name) {
    values[name] = fs.readFileSync(path.join(dir, name), {encoding: 'utf8'});
  });
  return values;
}

exports.getValues = getValues;