'use strict';

var stringify = require('../vendor/json-stringify-safe');
var parsers = require('./parsers');
var zlib = require('zlib');
var utils = require('./utils');
var uuid = require('uuid');
var transports = require('./transports');
var nodeUtil = require('util'); // nodeUtil to avoid confusion with "utils"
var events = require('events');
var domain = require('domain');
var md5 = require('md5');

var instrumentor = require('./instrumentation/instrumentor');

var extend = utils.extend;

function Raven() {
  this.breadcrumbs = {
    record: this.captureBreadcrumb.bind(this)
  };
}

nodeUtil.inherits(Raven, events.EventEmitter);

extend(Raven.prototype, {
  config: function config(dsn, options) {
    // We get lots of users using raven-node when they want raven-js, hence this warning if it seems like a browser
    if (
      typeof window !== 'undefined' &&
      typeof document !== 'undefined' &&
      typeof navigator !== 'undefined'
    ) {
      utils.consoleAlertOnce(
        "This looks like a browser environment; are you sure you don't want Raven.js for browser JavaScript? https://sentry.io/for/javascript"
      );
    }

    if (arguments.length === 0) {
      // no arguments, use default from environment
      dsn = global.process.env.SENTRY_DSN;
      options = {};
    }
    if (typeof dsn === 'object') {
      // They must only be passing through options
      options = dsn;
      dsn = global.process.env.SENTRY_DSN;
    }
    options = options || {};

    this.raw_dsn = dsn;
    this.dsn = utils.parseDSN(dsn);
    this.name =
      options.name || global.process.env.SENTRY_NAME || require('os').hostname();
    this.root = options.root || global.process.cwd();
    this.transport = options.transport || transports[this.dsn.protocol];
    this.sendTimeout = options.sendTimeout || 1;
    this.release = options.release || global.process.env.SENTRY_RELEASE;
    this.environment =
      options.environment ||
      global.process.env.SENTRY_ENVIRONMENT ||
      global.process.env.NODE_ENV;

    // autoBreadcrumbs: true enables all, autoBreadcrumbs: false disables all
    // autoBreadcrumbs: { http: true } enables a single type
    this.autoBreadcrumbs = options.autoBreadcrumbs || false;
    // default to 30, don't allow higher than 100
    this.maxBreadcrumbs = Math.max(0, Math.min(options.maxBreadcrumbs || 30, 100));

    this.captureUnhandledRejections = options.captureUnhandledRejections;
    this.loggerName = options.logger;
    this.dataCallback = options.dataCallback;
    this.shouldSendCallback = options.shouldSendCallback;
    this.sampleRate = typeof options.sampleRate === 'undefined' ? 1 : options.sampleRate;
    this.maxReqQueueCount = options.maxReqQueueCount || 100;
    this.parseUser = options.parseUser;
    this.stacktrace = options.stacktrace || false;

    if (!this.dsn) {
      utils.consoleAlert('no DSN provided, error reporting disabled');
    }

    if (this.dsn.protocol === 'https') {
      // In case we want to provide our own SSL certificates / keys
      this.ca = options.ca || null;
    }

    // enabled if a dsn is set
    this._enabled = !!this.dsn;

    var globalContext = (this._globalContext = {});
    if (options.tags) {
      globalContext.tags = options.tags;
    }
    if (options.extra) {
      globalContext.extra = options.extra;
    }

    this.onFatalError = this.defaultOnFatalError = function(err, sendErr, eventId) {
      console.error(err && err.stack ? err.stack : err);
      global.process.exit(1);
    };
    this.uncaughtErrorHandler = this.makeErrorHandler();

    this.on('error', function(err) {
      utils.consoleAlert('failed to send exception to sentry: ' + err.message);
    });

    return this;
  },

  install: function install(cb) {
    if (this.installed) return this;

    if (typeof cb === 'function') {
      this.onFatalError = cb;
    }

    global.process.on('uncaughtException', this.uncaughtErrorHandler);

    if (this.captureUnhandledRejections) {
      var self = this;
      global.process.on('unhandledRejection', function(reason) {
        self.captureException(reason, function(sendErr, eventId) {
          if (!sendErr) utils.consoleAlert('unhandledRejection captured: ' + eventId);
        });
      });
    }

    instrumentor.instrument(this, this.autoBreadcrumbs);

    this.installed = true;

    return this;
  },

  uninstall: function uninstall() {
    if (!this.installed) return this;

    instrumentor.deinstrument(this);

    // todo: this works for tests for now, but isn't what we ultimately want to be doing
    global.process.removeAllListeners('uncaughtException');
    global.process.removeAllListeners('unhandledRejection');

    this.installed = false;

    return this;
  },

  makeErrorHandler: function() {
    var self = this;
    var caughtFirstError = false;
    var caughtSecondError = false;
    var calledFatalError = false;
    var firstError;
    return function(err) {
      if (!caughtFirstError) {
        // this is the first uncaught error and the ultimate reason for shutting down
        // we want to do absolutely everything possible to ensure it gets captured
        // also we want to make sure we don't go recursion crazy if more errors happen after this one
        firstError = err;
        caughtFirstError = true;
        self.captureException(err, {level: 'fatal'}, function(sendErr, eventId) {
          if (!calledFatalError) {
            calledFatalError = true;
            self.onFatalError(err, sendErr, eventId);
          }
        });
      } else if (calledFatalError) {
        // we hit an error *after* calling onFatalError - pretty boned at this point, just shut it down
        utils.consoleAlert(
          'uncaught exception after calling fatal error shutdown callback - this is bad! forcing shutdown'
        );
        self.defaultOnFatalError(err);
      } else if (!caughtSecondError) {
        // two cases for how we can hit this branch:
        //   - capturing of first error blew up and we just caught the exception from that
        //     - quit trying to capture, proceed with shutdown
        //   - a second independent error happened while waiting for first error to capture
        //     - want to avoid causing premature shutdown before first error capture finishes
        // it's hard to immediately tell case 1 from case 2 without doing some fancy/questionable domain stuff
        // so let's instead just delay a bit before we proceed with our action here
        // in case 1, we just wait a bit unnecessarily but ultimately do the same thing
        // in case 2, the delay hopefully made us wait long enough for the capture to finish
        // two potential nonideal outcomes:
        //   nonideal case 1: capturing fails fast, we sit around for a few seconds unnecessarily before proceeding correctly by calling onFatalError
        //   nonideal case 2: case 2 happens, 1st error is captured but slowly, timeout completes before capture and we treat second error as the sendErr of (nonexistent) failure from trying to capture first error
        // note that after hitting this branch, we might catch more errors where (caughtSecondError && !calledFatalError)
        //   we ignore them - they don't matter to us, we're just waiting for the second error timeout to finish
        caughtSecondError = true;
        setTimeout(function() {
          if (!calledFatalError) {
            // it was probably case 1, let's treat err as the sendErr and call onFatalError
            calledFatalError = true;
            self.onFatalError(firstError, err);
          } else {
            // it was probably case 2, our first error finished capturing while we waited, cool, do nothing
          }
        }, (self.sendTimeout + 1) * 1000); // capturing could take at least sendTimeout to fail, plus an arbitrary second for how long it takes to collect surrounding source etc
      }
    };
  },

  generateEventId: function generateEventId() {
    return uuid().replace(/-/g, '');
  },

  process: function process(eventId, kwargs, cb) {
    // prod codepaths shouldn't hit this branch, for testing
    if (typeof eventId === 'object') {
      cb = kwargs;
      kwargs = eventId;
      eventId = this.generateEventId();
    }

    var domainContext = (domain.active && domain.active.sentryContext) || {};
    kwargs.user = extend({}, this._globalContext.user, domainContext.user, kwargs.user);
    kwargs.tags = extend({}, this._globalContext.tags, domainContext.tags, kwargs.tags);
    kwargs.extra = extend(
      {},
      this._globalContext.extra,
      domainContext.extra,
      kwargs.extra
    );
    kwargs.breadcrumbs = {
      values: domainContext.breadcrumbs || this._globalContext.breadcrumbs || []
    };

    /*
      `request` is our specified property name for the http interface: https://docs.sentry.io/clientdev/interfaces/http/
      `req` is the conventional name for a request object in node/express/etc
      we want to enable someone to pass a `request` property to kwargs according to http interface
      but also want to provide convenience for passing a req object and having us parse it out
      so we only parse a `req` property if the `request` property is absent/empty (and hence we won't clobber)
      parseUser returns a partial kwargs object with a `request` property and possibly a `user` property
      */
    kwargs.request = this._createRequestObject(
      this._globalContext.request,
      domainContext.request,
      kwargs.request
    );
    if (Object.keys(kwargs.request).length === 0) {
      var req = this._createRequestObject(
        this._globalContext.req,
        domainContext.req,
        kwargs.req
      );
      if (Object.keys(req).length > 0) {
        var parseUser = Object.keys(kwargs.user).length === 0 ? this.parseUser : false;
        extend(kwargs, parsers.parseRequest(req, parseUser));
        delete kwargs.req;
      }
    }

    kwargs.modules = utils.getModules();
    kwargs.server_name = kwargs.server_name || this.name;

    if (typeof global.process.version !== 'undefined') {
      kwargs.extra.node = global.process.version;
    }

    kwargs.environment = kwargs.environment || this.environment;
    kwargs.logger = kwargs.logger || this.loggerName;
    kwargs.event_id = eventId;
    kwargs.timestamp = new Date().toISOString().split('.')[0];
    kwargs.project = this.dsn.project_id;
    kwargs.platform = 'node';
    kwargs.release = this.release;

    // Cleanup empty properties before sending them to the server
    Object.keys(kwargs).forEach(function(key) {
      if (kwargs[key] == null || kwargs[key] === '') {
        delete kwargs[key];
      }
    });

    if (this.dataCallback) {
      kwargs = this.dataCallback(kwargs);
    }

    var shouldSend = true;
    if (!this._enabled) shouldSend = false;
    if (this.shouldSendCallback && !this.shouldSendCallback(kwargs)) shouldSend = false;
    if (Math.random() >= this.sampleRate) shouldSend = false;

    if (shouldSend) {
      this.send(kwargs, cb);
    } else {
      // wish there was a good way to communicate to cb why we didn't send; worth considering cb api change?
      // could be shouldSendCallback, could be disabled, could be sample rate
      // avoiding setImmediate here because node 0.8
      cb &&
        setTimeout(function() {
          cb(null, eventId);
        }, 0);
    }
  },

  send: function send(kwargs, cb) {
    var self = this;
    var skwargs = stringify(kwargs);
    var eventId = kwargs.event_id;

    zlib.deflate(skwargs, function(err, buff) {
      var message = buff.toString('base64'),
        timestamp = new Date().getTime(),
        headers = {
          'X-Sentry-Auth': utils.getAuthHeader(
            timestamp,
            self.dsn.public_key,
            self.dsn.private_key
          ),
          'Content-Type': 'application/octet-stream',
          'Content-Length': message.length
        };

      self.transport.send(self, message, headers, eventId, cb);
    });
  },

  captureMessage: function captureMessage(message, kwargs, cb) {
    if (!cb && typeof kwargs === 'function') {
      cb = kwargs;
      kwargs = {};
    } else {
      kwargs = kwargs || {};
    }

    var eventId = this.generateEventId();

    if (this.stacktrace) {
      var ex;
      // Generate a "synthetic" stack trace
      try {
        throw new Error(message);
      } catch (ex1) {
        ex = ex1;
      }

      utils.parseStack(
        ex,
        function(frames) {
          // We trim last frame, as it's our `throw new Error(message)` call itself, which is redundant
          kwargs.stacktrace = {
            frames: frames.slice(0, -1)
          };
          this.process(eventId, parsers.parseText(message, kwargs), cb);
        }.bind(this)
      );
    } else {
      this.process(eventId, parsers.parseText(message, kwargs), cb);
    }

    return eventId;
  },

  captureException: function captureException(err, kwargs, cb) {
    if (!cb && typeof kwargs === 'function') {
      cb = kwargs;
      kwargs = {};
    } else {
      kwargs = kwargs || {};
    }

    if (!(err instanceof Error)) {
      if (utils.isPlainObject(err)) {
        // This will allow us to group events based on top-level keys
        // which is much better than creating new group when any key/value change
        var keys = Object.keys(err).sort();
        var hash = md5(keys);
        var message =
          'Non-Error exception captured with keys: ' +
          utils.serializeKeysForMessage(keys);
        var serializedException = utils.serializeException(err);

        kwargs.message = message;
        kwargs.fingerprint = [hash];
        kwargs.extra = {
          __serialized__: serializedException
        };

        err = new Error(message);
      } else {
        // This handles when someone does:
        //   throw "something awesome";
        // We synthesize an Error here so we can extract a (rough) stack trace.
        err = new Error(err);
      }
    }

    var self = this;
    var eventId = this.generateEventId();
    parsers.parseError(err, kwargs, function(kw) {
      self.process(eventId, kw, cb);
    });

    return eventId;
  },

  context: function(ctx, func) {
    if (!func && typeof ctx === 'function') {
      func = ctx;
      ctx = {};
    }

    // todo/note: raven-js takes an args param to do apply(this, args)
    // i don't think it's correct/necessary to bind this to the wrap call
    // and i don't know if we need to support the args param; it's undocumented
    return this.wrap(ctx, func).apply(null);
  },

  wrap: function(options, func) {
    if (!this.installed) {
      utils.consoleAlertOnce(
        'Raven has not been installed, therefore no breadcrumbs will be captured. Call `Raven.config(...).install()` to fix this.'
      );
    }
    if (!func && typeof options === 'function') {
      func = options;
      options = {};
    }

    var wrapDomain = domain.create();
    // todo: better property name than sentryContext, maybe __raven__ or sth?
    wrapDomain.sentryContext = options;

    wrapDomain.on('error', this.uncaughtErrorHandler);
    var wrapped = wrapDomain.bind(func);

    for (var property in func) {
      if ({}.hasOwnProperty.call(func, property)) {
        wrapped[property] = func[property];
      }
    }
    wrapped.prototype = func.prototype;
    wrapped.__raven__ = true;
    wrapped.__inner__ = func;
    // note: domain.bind sets wrapped.domain, but it's not documented, unsure if we should rely on that
    wrapped.__domain__ = wrapDomain;

    return wrapped;
  },

  interceptErr: function(options, func) {
    if (!func && typeof options === 'function') {
      func = options;
      options = {};
    }
    var self = this;
    var wrapped = function() {
      var err = arguments[0];
      if (err instanceof Error) {
        self.captureException(err, options);
      } else {
        func.apply(null, arguments);
      }
    };

    // repetitive with wrap
    for (var property in func) {
      if ({}.hasOwnProperty.call(func, property)) {
        wrapped[property] = func[property];
      }
    }
    wrapped.prototype = func.prototype;
    wrapped.__raven__ = true;
    wrapped.__inner__ = func;

    return wrapped;
  },

  setContext: function setContext(ctx) {
    if (domain.active) {
      domain.active.sentryContext = ctx;
    } else {
      this._globalContext = ctx;
    }
    return this;
  },

  mergeContext: function mergeContext(ctx) {
    extend(this.getContext(), ctx);
    return this;
  },

  getContext: function getContext() {
    if (domain.active) {
      if (!domain.active.sentryContext) {
        domain.active.sentryContext = {};
        utils.consoleAlert('sentry context not found on active domain');
      }
      return domain.active.sentryContext;
    }
    return this._globalContext;
  },

  setCallbackHelper: function(propertyName, callback) {
    var original = this[propertyName];
    if (typeof callback === 'function') {
      this[propertyName] = function(data) {
        return callback(data, original);
      };
    } else {
      this[propertyName] = callback;
    }

    return this;
  },

  /*
   * Set the dataCallback option
   *
   * @param {function} callback The callback to run which allows the
   *                            data blob to be mutated before sending
   * @return {Raven}
   */
  setDataCallback: function(callback) {
    return this.setCallbackHelper('dataCallback', callback);
  },

  /*
   * Set the shouldSendCallback option
   *
   * @param {function} callback The callback to run which allows
   *                            introspecting the blob before sending
   * @return {Raven}
   */
  setShouldSendCallback: function(callback) {
    return this.setCallbackHelper('shouldSendCallback', callback);
  },

  requestHandler: function() {
    var self = this;
    return function ravenMiddleware(req, res, next) {
      self.context({req: req}, function() {
        domain.active.add(req);
        domain.active.add(res);
        next();
      });
    };
  },

  errorHandler: function() {
    var self = this;
    return function(err, req, res, next) {
      var status =
        err.status ||
        err.statusCode ||
        err.status_code ||
        (err.output && err.output.statusCode) ||
        500;

      // skip anything not marked as an internal server error
      if (status < 500) return next(err);

      var eventId = self.captureException(err, {req: req});
      res.sentry = eventId;
      return next(err);
    };
  },

  captureBreadcrumb: function(breadcrumb) {
    // Avoid capturing global-scoped breadcrumbs before instrumentation finishes
    if (!this.installed) return;

    breadcrumb = extend(
      {
        timestamp: +new Date() / 1000
      },
      breadcrumb
    );
    var currCtx = this.getContext();
    if (!currCtx.breadcrumbs) currCtx.breadcrumbs = [];
    currCtx.breadcrumbs.push(breadcrumb);
    if (currCtx.breadcrumbs.length > this.maxBreadcrumbs) {
      currCtx.breadcrumbs.shift();
    }
    this.setContext(currCtx);
  },

  _createRequestObject: function() {
    /**
     * When using proxy, some of the attributes of req/request objects are non-enumerable.
     * To make sure, that they are still available to us after we consolidate our sources
     * (eg. globalContext.request + domainContext.request + kwargs.request),
     * we manually pull them out from original objects.
     *
     * Same scenario happens when some frameworks (eg. Koa) decide to use request within
     * request. eg `this.request.req`, which adds aliases to the main `request` object.
     * By manually reassigning them here, we don't need to add additional checks
     * like `req.method || (req.req && req.req.method)`
     *
     * We don't use Object.assign/extend as it's only merging over objects own properties,
     * and we don't want to go through all of the properties as well, as we simply don't
     * need all of them.
     **/
    var sources = Array.from(arguments).filter(function(source) {
      return Object.prototype.toString.call(source) === '[object Object]';
    });
    sources = [{}].concat(sources);
    var request = extend.apply(null, sources);
    var nonEnumerables = [
      'headers',
      'hostname',
      'ip',
      'method',
      'protocol',
      'query',
      'secure',
      'url'
    ];

    nonEnumerables.forEach(function(key) {
      sources.forEach(function(source) {
        if (source[key]) request[key] = source[key];
      });
    });

    /**
     * Check for 'host' *only* after we checked for 'hostname' first.
     * This way we can avoid the noise coming from Express deprecation warning
     * https://github.com/expressjs/express/blob/b97faff6e2aa4d34d79485fe4331cb0eec13ad57/lib/request.js#L450-L452
     * REF: https://github.com/getsentry/raven-node/issues/96#issuecomment-354748884
     **/
    if (!request.hasOwnProperty('hostname')) {
      sources.forEach(function(source) {
        if (source.host) request.host = source.host;
      });
    }

    return request;
  }
});

// Maintain old API compat, need to make sure arguments length is preserved
function Client(dsn, options) {
  if (dsn instanceof Client) return dsn;
  var ravenInstance = new Raven();
  return ravenInstance.config.apply(ravenInstance, arguments);
}
nodeUtil.inherits(Client, Raven);

// Singleton-by-default but not strictly enforced
// todo these extra export props are sort of an adhoc mess, better way to manage?
var defaultInstance = new Raven();
defaultInstance.Client = Client;
defaultInstance.version = require('../package.json').version;
defaultInstance.disableConsoleAlerts = utils.disableConsoleAlerts;

module.exports = defaultInstance;