"use strict";

var loggerjs = require('./server/logger.js')
  , logger = loggerjs.get('appium')
  , UUID = require('uuid-js')
  , _ = require('underscore')
  , Capabilities = require('./server/capabilities')
  , IOS = require('./devices/ios/ios.js')
  , Safari = require('./devices/ios/safari.js')
  , Android = require('./devices/android/android.js')
  , Selendroid = require('./devices/android/selendroid.js')
  , Chrome = require('./devices/android/chrome.js')
  , FirefoxOs = require('./devices/firefoxos/firefoxos.js')
  , jwpResponse = require('./devices/common.js').jwpResponse
  , status = require("./server/status.js");

var DT_IOS = "ios"
  , DT_SAFARI = "safari"
  , DT_ANDROID = "android"
  , DT_CHROME = "chrome"
  , DT_SELENDROID = "selendroid"
  , DT_FIREFOX_OS = "firefoxos";

var Appium = function (args) {
  this.args = _.clone(args);
  this.args.callbackAddress = this.args.callbackAddress || this.args.address;
  this.args.callbackPort = this.args.callbackPort || this.args.port;
  // we need to keep an unmodified copy of the args so that we can restore
  // any server arguments between sessions to their default values
  // (otherwise they might be overridden by session-level caps)
  this.serverArgs = _.clone(this.args);
  this.rest = null;
  this.webSocket = null;
  this.deviceType = null;
  this.device = null;
  this.sessionId = null;
  this.dyingSessionId = null;
  this.desiredCapabilities = {};
  this.oldDesiredCapabilities = {};
  this.session = null;
  this.preLaunched = false;
  this.sessionOverride = this.args.sessionOverride;
  this.resetting = false;
  this.defCommandTimeoutMs = this.args.defaultCommandTimeout * 1000;
  this.commandTimeoutMs = this.defCommandTimeoutMs;
  this.commandTimeout = null;
};

Appium.prototype.attachTo = function (rest) {
  this.rest = rest;
};

Appium.prototype.attachSocket = function (webSocket) {
  this.webSocket = webSocket;
};

Appium.prototype.registerConfig = function (configObj) {
  this.serverConfig = configObj;
};

Appium.prototype.deviceIsRegistered = function (deviceType) {
  if (deviceType === DT_SAFARI) deviceType = DT_IOS;
  if (deviceType === DT_CHROME) deviceType = DT_ANDROID;
  return _.has(this.serverConfig, deviceType);
};

Appium.prototype.preLaunch = function (cb) {
  logger.info("Pre-launching app");
  var caps = {};
  this.start(caps, function (err) {
    if (err) {
      cb(err, null);
    } else {
      this.preLaunched = true;
      cb(null, this);
    }
  }.bind(this));
};

Appium.prototype.setArgFromCap = function (arg, cap) {
  if (typeof this.desiredCapabilities[cap] !== "undefined") {
    this.args[arg] = this.desiredCapabilities[cap];
  }
};

Appium.prototype.updateResetArgsFromCaps = function () {
  this.setArgFromCap("noReset", "noReset");
  this.setArgFromCap("fullReset", "fullReset");

  // user can set noReset or fullReset
  var caps = this.desiredCapabilities;
  if (caps.noReset === true) this.args.fullReset = false;
  if (caps.fullReset === true) this.args.noReset = false;

  // not user visible via caps
  this.args.fastReset = !this.args.fullReset && !this.args.noReset;
  this.args.skipUninstall = this.args.fastReset || this.args.noReset;
};

Appium.prototype.start = function (desiredCaps, cb) {

  var configureAndStart = function () {
    this.desiredCapabilities = new Capabilities(desiredCaps);
    this.updateResetArgsFromCaps();
    this.args.webSocket = this.webSocket; // allow to persist over many sessions
    this.configure(this.args, this.desiredCapabilities, function (err) {
      if (err) {
        logger.debug("Got configuration error, not starting session");
        this.cleanupSession();
        cb(err, null);
      } else {
        this.invoke(cb);
      }
    }.bind(this));
  }.bind(this);
  if (this.sessionId === null) {
    configureAndStart();
  } else if (this.sessionOverride) {
    logger.info("Found an existing session to clobber, shutting it down " +
                 "first...");
    this.stop(function (err) {
      if (err) return cb(err);
      logger.info("Old session shut down OK, proceeding to new session");
      configureAndStart();
    });
  } else {
    return cb(new Error("Requested a new session but one was in progress"));
  }
};

Appium.prototype.getDeviceType = function (args, caps) {
  var platform = caps.platformName || args.platformName;
  platform = platform ? platform.toString().toLowerCase() : '';
  var browser = caps.browserName || args.browserName;
  browser = browser ? browser.toString().toLowerCase() : '';
  var automation = caps.automationName || args.automationName;
  automation = automation ? automation.toString().toLowerCase() : '';
  var app = args.app || caps.app;
  app = app ? app.toString().toLowerCase() : '';
  var pkg = args.androidPackage || caps.appPackage;
  pkg = pkg ? pkg.toString().toLowerCase() : '';

  var validPlatforms = ['ios', 'android', 'firefoxos'];
  if (platform && !_.contains(validPlatforms, platform)) {
    throw new Error("Could not determine your device. You sent in a " +
                    "platformName capability of '" + platform + "' but that " +
                    "is not a supported platform. Supported platforms are: " +
                    "iOS, Android and FirefoxOS");
  }

  // TODO: Set DT_SELENDROID type based on platformVersion
  var type = this.getDeviceTypeFromPlatform(platform);

  if (type === DT_IOS) {
     // Detect Safari browser from browserName, app and args
    if (
        args.safari ||
        this.isSafariBrowser(browser) ||
        this.isSafariBrowser(app)
      ) {
      type = DT_SAFARI;
    }
  } else if (type === DT_ANDROID) {
    // Detect Chrome browser from browserName, app and pkg
    if (
        this.isChromeBrowser(browser) ||
        this.isChromeBrowser(app) ||
        this.isChromePackage(pkg)
      ) {
      type = DT_CHROME;
    } else if (this.isSelendroidAutomation(automation)) {
      type = DT_SELENDROID;
    }
  }

  if (!type) {
    throw new Error("Could not determine your device from Appium arguments " +
                  "or desired capabilities. Please make sure to specify the " +
                  "'deviceName' and 'platformName' capabilities");
  }
  return type;
};

Appium.prototype.isSelendroidAutomation = function (automation) {
  return automation.indexOf('selendroid') !== -1;
};

Appium.prototype.isChromeBrowser = function (browser) {
  return _.contains(["chrome", "chromium", "chromebeta", "browser"], browser);
};

Appium.prototype.isChromePackage = function (pkg) {
  var chromePkgs = [
    "com.android.chrome"
  , "com.chrome.beta"
  , "org.chromium.chrome.shell"
  , "com.android.browser"
  ];
  return _.contains(chromePkgs, pkg);
};

Appium.prototype.isSafariBrowser = function (browser) {
  return browser === "safari";
};

Appium.prototype.getDeviceTypeFromPlatform = function (caps) {
  var device = null;
  switch (caps) {
  case 'ios':
    device = DT_IOS;
    break;
  case 'android':
    device = DT_ANDROID;
    break;
  case 'firefoxos':
    device = DT_FIREFOX_OS;
    break;
  }
  return device;
};

Appium.prototype.configure = function (args, desiredCaps, cb) {
  var deviceType;
  try {
    deviceType = this.getDeviceType(args, desiredCaps);
    if (!args.launch) desiredCaps.checkValidity(deviceType, args.enforceStrictCaps);
  } catch (e) {
    logger.error(e.message);
    return cb(e);
  }

  if (!this.deviceIsRegistered(deviceType)) {
    logger.error("Trying to run a session for device '" + deviceType + "' " +
                 "but that device hasn't been configured. Run config");
    return cb(new Error("Device " + deviceType + " not configured yet"));
  }
  this.device = this.getNewDevice(deviceType);
  this.device.configure(args, desiredCaps, cb);
  // TODO: better collaboration between the Appium and Device objects
  this.device.onResetTimeout = function () { this.resetTimeout(); }.bind(this);
};

Appium.prototype.invoke = function (cb) {
  this.sessionId = UUID.create().hex;
  logger.debug('Creating new appium session ' + this.sessionId);

  if (this.device.args.autoLaunch === false) {
    // if user has passed in desiredCaps.autoLaunch = false
    // meaning they will manage app install / launching
    if (typeof this.device.noLaunchSetup === "function") {
      this.device.noLaunchSetup(function (err) {
        if (err) return cb(err);
        cb(null, this.device);
      }.bind(this));
    } else {
      cb(null, this.device);
    }
  } else {
    // the normal case, where we launch the device for folks

    var onStart = function (err, sessionIdOverride) {
      if (sessionIdOverride) {
        this.sessionId = sessionIdOverride;
        logger.debug("Overriding session id with " +
                    JSON.stringify(sessionIdOverride));
      }
      if (err) return this.cleanupSession(err, cb);
      logger.debug("Device launched! Ready for commands");
      this.setCommandTimeout(this.desiredCapabilities.newCommandTimeout);
      cb(null, this.device);
    }.bind(this);

    this.device.start(onStart, _.once(this.cleanupSession.bind(this)));
  }
};

Appium.prototype.getNewDevice = function (deviceType) {
  var DeviceClass = (function () {
    switch (deviceType) {
      case DT_IOS:
        return IOS;
      case DT_SAFARI:
        return Safari;
      case DT_ANDROID:
        return Android;
      case DT_CHROME:
        return Chrome;
      case DT_SELENDROID:
        return Selendroid;
      case DT_FIREFOX_OS:
        return FirefoxOs;
      default:
        throw new Error("Tried to start a device that doesn't exist: " +
                        deviceType);
    }
  })();
  return new DeviceClass();
};

Appium.prototype.timeoutWaitingForCommand = function () {
  logger.debug("Didn't get a new command in " + (this.commandTimeoutMs / 1000) +
              " secs, shutting down...");
  this.stop(function () {
    logger.debug("We shut down because no new commands came in");
  }.bind(this));
};

Appium.prototype.cleanupSession = function (err, cb) {
  logger.debug("Cleaning up appium session");
  if (this.commandTimeout) {
    clearTimeout(this.commandTimeout);
    this.commandTimeout = null;
  }
  this.commandTimeoutMs = this.defCommandTimeoutMs;
  if (this.sessionId) {
    // for some reason, stop has not been called
    this.dyingSessionId = this.sessionId;
    this.sessionId = null;
  }
  this.device = null;
  this.args = _.clone(this.serverArgs);
  this.oldDesiredCapabilities = _.clone(this.desiredCapabilities.desired);
  this.desiredCapabilities = {};
  if (cb) {
    if (err) return cb(err);
    cb(null, {status: status.codes.Success.code, value: null,
      sessionId: this.dyingSessionId});
  }
};

Appium.prototype.resetTimeout = function () {
  if (this.commandTimeout) {
    clearTimeout(this.commandTimeout);
  }
  if (this.commandTimeoutMs && this.commandTimeoutMs > 0) {
    this.commandTimeout = setTimeout(this.timeoutWaitingForCommand.bind(this),
      this.commandTimeoutMs);
  }
};

Appium.prototype.setCommandTimeout = function (secs, cb) {
  if (typeof secs === "undefined") {
    secs = this.defCommandTimeoutMs / 1000;
    logger.debug("Setting command timeout to the default of " + secs + " secs");
  } else {
    logger.debug("Setting command timeout to " + secs + " secs");
  }
  this.commandTimeoutMs = secs * 1000;
  this.resetTimeout();
  if (typeof cb === "function") {
    jwpResponse(null, secs, cb);
  }
};

Appium.prototype.stop = function (cb) {
  if (this.sessionId === null || this.device === null) {
    logger.debug("Trying to stop appium but there's no session, doing nothing");
    return cb();
  }
  logger.info('Shutting down appium session');
  this.dyingSessionId = this.sessionId;
  this.sessionId = null;
  this.device.stop(function (err) {
    this.cleanupSession(err, cb);
  }.bind(this));
};

Appium.prototype.reset = function (cb) {
  logger.debug("Resetting app mid-session");
  if (typeof this.device.resetAndStartApp === "function") {
    logger.debug("Running device specific reset");
    this.device.resetAndStartApp(function (err) {
      jwpResponse(err, cb);
    });
  } else {
    logger.debug("Running generic full reset");
    var oldImpWait = this.device.implicitWaitMs
      , oldCommandTimeoutMs = this.commandTimeoutMs
      , oldId = this.sessionId;

    this.resetting = true;
    this.stop(function () {
      logger.debug("Restarting app");
      this.start(this.oldDesiredCapabilities, function (err) {
        if (err) return cb(err);
        this.resetting = false;
        this.device.implicitWaitMs = oldImpWait;
        this.sessionId = oldId;
        this.dyingSessionId = null;
        this.setCommandTimeout(oldCommandTimeoutMs / 1000, cb);
      }.bind(this));
    }.bind(this));
  }
};

module.exports = function (args) {
  return new Appium(args);
};