var helper = require('./helper');
var events = require('./events');
var logger = require('./logger');

var Result = require('./browser_result');


// The browser is ready to execute tests.
var READY = 1;

// The browser is executing the tests/
var EXECUTING = 2;

// The browser is not executing, but temporarily disconnected (waiting for reconnecting).
var READY_DISCONNECTED = 3;

// The browser is executing the tests, but temporarily disconnect (waiting for reconnecting).
var EXECUTING_DISCONNECTED = 4;

// The browser got permanently disconnected (being removed from the collection and destroyed).
var DISCONNECTED = 5;


var Browser = function(id, fullName, /* capturedBrowsers */ collection, emitter, socket, timer,
    /* config.browserDisconnectTimeout */ disconnectDelay,
    /* config.browserNoActivityTimeout */ noActivityTimeout) {

  var name = helper.browserFullNameToShort(fullName);
  var log = logger.create(name);
  var activeSockets = [socket];
  var activeSocketsIds = function() {
    return activeSockets.map(function(s) {
      return s.id;
    }).join(', ');
  };

  var self = this;
  var pendingDisconnect;
  var disconnect = function(reason) {
    self.state = DISCONNECTED;
    self.disconnectsCount++;
    log.warn('Disconnected (%d times)' + (reason || ''), self.disconnectsCount);
    collection.remove(self);
  };

  var noActivityTimeoutId;
  var refreshNoActivityTimeout = noActivityTimeout ? function() {
    clearNoActivityTimeout();
    noActivityTimeoutId = timer.setTimeout(function() {
      self.lastResult.totalTimeEnd();
      self.lastResult.disconnected = true;
      disconnect(', because no message in ' + noActivityTimeout + ' ms.');
      emitter.emit('browser_complete', self);
    }, noActivityTimeout);
  } : function() {};

  var clearNoActivityTimeout = noActivityTimeout ? function() {
    if (noActivityTimeoutId) {
      timer.clearTimeout(noActivityTimeoutId);
      noActivityTimeoutId = null;
    }
  } : function() {};

  this.id = id;
  this.fullName = fullName;
  this.name = name;
  this.state = READY;
  this.lastResult = new Result();
  this.disconnectsCount = 0;

  this.init = function() {
    collection.add(this);

    events.bindAll(this, socket);

    log.info('Connected on socket %s with id %s', socket.id, id);

    // TODO(vojta): move to collection
    emitter.emit('browsers_change', collection);

    emitter.emit('browser_register', this);
  };

  this.isReady = function() {
    return this.state === READY;
  };

  this.toString = function() {
    return this.name;
  };

  this.onError = function(error) {
    if (this.isReady()) {
      return;
    }

    this.lastResult.error = true;
    emitter.emit('browser_error', this, error);

    refreshNoActivityTimeout();
  };

  this.onInfo = function(info) {
    if (this.isReady()) {
      return;
    }

    // TODO(vojta): remove
    if (helper.isDefined(info.dump)) {
      emitter.emit('browser_log', this, info.dump, 'dump');
    }

    if (helper.isDefined(info.log)) {
      emitter.emit('browser_log', this, info.log, info.type);
    }

    refreshNoActivityTimeout();
  };

  this.onStart = function(info) {
    this.lastResult = new Result();
    this.lastResult.total = info.total;

    if (info.total === null) {
      log.warn('Adapter did not report total number of specs.');
    }

    emitter.emit('browser_start', this, info);
    refreshNoActivityTimeout();
  };

  this.onComplete = function(result) {
    if (this.isReady()) {
      return;
    }

    this.state = READY;
    this.lastResult.totalTimeEnd();

    if (!this.lastResult.success) {
      this.lastResult.error = true;
    }

    emitter.emit('browsers_change', collection);
    emitter.emit('browser_complete', this, result);

    clearNoActivityTimeout();
  };

  this.onDisconnect = function(_, disconnectedSocket) {
    activeSockets.splice(activeSockets.indexOf(disconnectedSocket), 1);

    if (activeSockets.length) {
      log.debug('Disconnected %s, still have %s', disconnectedSocket.id, activeSocketsIds());
      return;
    }

    if (this.state === READY) {
      disconnect();
    } else if (this.state === EXECUTING) {
      log.debug('Disconnected during run, waiting %sms for reconnecting.', disconnectDelay);
      this.state = EXECUTING_DISCONNECTED;

      pendingDisconnect = timer.setTimeout(function() {
        self.lastResult.totalTimeEnd();
        self.lastResult.disconnected = true;
        disconnect();
        emitter.emit('browser_complete', self);
      }, disconnectDelay);

      clearNoActivityTimeout();
    }
  };

  this.reconnect = function(newSocket) {
    if (this.state === EXECUTING_DISCONNECTED) {
      this.state = EXECUTING;
      log.debug('Reconnected on %s.', newSocket.id);
    } else if (this.state === EXECUTING || this.state === READY) {
      log.debug('New connection %s (already have %s)', newSocket.id, activeSocketsIds());
    } else if (this.state === DISCONNECTED) {
      this.state = READY;
      log.info('Connected on socket %s with id %s', newSocket.id, this.id);
      collection.add(this);

      // TODO(vojta): move to collection
      emitter.emit('browsers_change', collection);

      emitter.emit('browser_register', this);
    }

    var exists = activeSockets.some(function(s) {
      return s.id === newSocket.id;
    });
    if (!exists) {
      activeSockets.push(newSocket);
      events.bindAll(this, newSocket);
    }

    if (pendingDisconnect) {
      timer.clearTimeout(pendingDisconnect);
    }

    refreshNoActivityTimeout();
  };

  this.onResult = function(result) {
    if (result.length) {
      return result.forEach(this.onResult, this);
    }

    // ignore - probably results from last run (after server disconnecting)
    if (this.isReady()) {
      return;
    }

    this.lastResult.add(result);

    emitter.emit('spec_complete', this, result);
    refreshNoActivityTimeout();
  };

  this.serialize = function() {
    return {
      id: this.id,
      name: this.name,
      isReady: this.state === READY
    };
  };

  this.execute = function(config) {
    activeSockets.forEach(function(socket) {
      socket.emit('execute', config);
    });

    this.state = EXECUTING;
    refreshNoActivityTimeout();
  };
};

Browser.STATE_READY = READY;
Browser.STATE_EXECUTING = EXECUTING;
Browser.STATE_READY_DISCONNECTED = READY_DISCONNECTED;
Browser.STATE_EXECUTING_DISCONNECTED = EXECUTING_DISCONNECTED;
Browser.STATE_DISCONNECTED = DISCONNECTED;


module.exports = Browser;
