// qwebchannel.js
/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Milian Wolff <milian.wolff@kdab.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWebChannel module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:BSD$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** BSD License Usage
** Alternatively, you may use this file under the terms of the BSD license
** as follows:
**
** "Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
**   * Redistributions of source code must retain the above copyright
**     notice, this list of conditions and the following disclaimer.
**   * Redistributions in binary form must reproduce the above copyright
**     notice, this list of conditions and the following disclaimer in
**     the documentation and/or other materials provided with the
**     distribution.
**   * Neither the name of The Qt Company Ltd nor the names of its
**     contributors may be used to endorse or promote products derived
**     from this software without specific prior written permission.
**
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
**
** $QT_END_LICENSE$
**
****************************************************************************/

"use strict";

var QWebChannelMessageTypes = {
    signal: 1,
    propertyUpdate: 2,
    init: 3,
    idle: 4,
    debug: 5,
    invokeMethod: 6,
    connectToSignal: 7,
    disconnectFromSignal: 8,
    setProperty: 9,
    response: 10,
};

var QWebChannel = function(transport, initCallback)
{
    if (typeof transport !== "object" || typeof transport.send !== "function") {
        console.error("The QWebChannel expects a transport object with a send function and onmessage callback property." +
                      " Given is: transport: " + typeof(transport) + ", transport.send: " + typeof(transport.send));
        return;
    }

    var channel = this;
    this.transport = transport;

    this.send = function(data)
    {
        if (typeof(data) !== "string") {
            data = JSON.stringify(data);
        }
        channel.transport.send(data);
    }

    this.transport.onmessage = function(message)
    {
        var data = message.data;
        if (typeof data === "string") {
            data = JSON.parse(data);
        }
        switch (data.type) {
            case QWebChannelMessageTypes.signal:
                channel.handleSignal(data);
                break;
            case QWebChannelMessageTypes.response:
                channel.handleResponse(data);
                break;
            case QWebChannelMessageTypes.propertyUpdate:
                channel.handlePropertyUpdate(data);
                break;
            default:
                console.error("invalid message received:", message.data);
                break;
        }
    }

    this.execCallbacks = {};
    this.execId = 0;
    this.exec = function(data, callback)
    {
        if (!callback) {
            // if no callback is given, send directly
            channel.send(data);
            return;
        }
        if (channel.execId === Number.MAX_VALUE) {
            // wrap
            channel.execId = Number.MIN_VALUE;
        }
        if (data.hasOwnProperty("id")) {
            console.error("Cannot exec message with property id: " + JSON.stringify(data));
            return;
        }
        data.id = channel.execId++;
        channel.execCallbacks[data.id] = callback;
        channel.send(data);
    };

    this.objects = {};

    this.handleSignal = function(message)
    {
        var object = channel.objects[message.object];
        if (object) {
            object.signalEmitted(message.signal, message.args);
        } else {
            console.warn("Unhandled signal: " + message.object + "::" + message.signal);
        }
    }

    this.handleResponse = function(message)
    {
        if (!message.hasOwnProperty("id")) {
            console.error("Invalid response message received: ", JSON.stringify(message));
            return;
        }
        channel.execCallbacks[message.id](message.data);
        delete channel.execCallbacks[message.id];
    }

    this.handlePropertyUpdate = function(message)
    {
        for (var i in message.data) {
            var data = message.data[i];
            var object = channel.objects[data.object];
            if (object) {
                object.propertyUpdate(data.signals, data.properties);
            } else {
                console.warn("Unhandled property update: " + data.object + "::" + data.signal);
            }
        }
        channel.exec({type: QWebChannelMessageTypes.idle});
    }

    this.debug = function(message)
    {
        channel.send({type: QWebChannelMessageTypes.debug, data: message});
    };

    channel.exec({type: QWebChannelMessageTypes.init}, function(data) {
        for (var objectName in data) {
            var object = new QObject(objectName, data[objectName], channel);
        }
        // now unwrap properties, which might reference other registered objects
        for (var objectName in channel.objects) {
            channel.objects[objectName].unwrapProperties();
        }
        if (initCallback) {
            initCallback(channel);
        }
        channel.exec({type: QWebChannelMessageTypes.idle});
    });
};

function QObject(name, data, webChannel)
{
    this.__id__ = name;
    webChannel.objects[name] = this;

    // List of callbacks that get invoked upon signal emission
    this.__objectSignals__ = {};

    // Cache of all properties, updated when a notify signal is emitted
    this.__propertyCache__ = {};

    var object = this;

    // ----------------------------------------------------------------------

    this.unwrapQObject = function(response)
    {
        if (response instanceof Array) {
            // support list of objects
            var ret = new Array(response.length);
            for (var i = 0; i < response.length; ++i) {
                ret[i] = object.unwrapQObject(response[i]);
            }
            return ret;
        }
        if (!response
            || !response["__QObject*__"]
            || response.id === undefined) {
            return response;
        }

        var objectId = response.id;
        if (webChannel.objects[objectId])
            return webChannel.objects[objectId];

        if (!response.data) {
            console.error("Cannot unwrap unknown QObject " + objectId + " without data.");
            return;
        }

        var qObject = new QObject( objectId, response.data, webChannel );
        qObject.destroyed.connect(function() {
            if (webChannel.objects[objectId] === qObject) {
                delete webChannel.objects[objectId];
                // reset the now deleted QObject to an empty {} object
                // just assigning {} though would not have the desired effect, but the
                // below also ensures all external references will see the empty map
                // NOTE: this detour is necessary to workaround QTBUG-40021
                var propertyNames = [];
                for (var propertyName in qObject) {
                    propertyNames.push(propertyName);
                }
                for (var idx in propertyNames) {
                    delete qObject[propertyNames[idx]];
                }
            }
        });
        // here we are already initialized, and thus must directly unwrap the properties
        qObject.unwrapProperties();
        return qObject;
    }

    this.unwrapProperties = function()
    {
        for (var propertyIdx in object.__propertyCache__) {
            object.__propertyCache__[propertyIdx] = object.unwrapQObject(object.__propertyCache__[propertyIdx]);
        }
    }

    function addSignal(signalData, isPropertyNotifySignal)
    {
        var signalName = signalData[0];
        var signalIndex = signalData[1];
        object[signalName] = {
            connect: function(callback) {
                if (typeof(callback) !== "function") {
                    console.error("Bad callback given to connect to signal " + signalName);
                    return;
                }

                object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
                object.__objectSignals__[signalIndex].push(callback);

                if (!isPropertyNotifySignal && signalName !== "destroyed") {
                    // only required for "pure" signals, handled separately for properties in propertyUpdate
                    // also note that we always get notified about the destroyed signal
                    webChannel.exec({
                        type: QWebChannelMessageTypes.connectToSignal,
                        object: object.__id__,
                        signal: signalIndex
                    });
                }
            },
            disconnect: function(callback) {
                if (typeof(callback) !== "function") {
                    console.error("Bad callback given to disconnect from signal " + signalName);
                    return;
                }
                object.__objectSignals__[signalIndex] = object.__objectSignals__[signalIndex] || [];
                var idx = object.__objectSignals__[signalIndex].indexOf(callback);
                if (idx === -1) {
                    console.error("Cannot find connection of signal " + signalName + " to " + callback.name);
                    return;
                }
                object.__objectSignals__[signalIndex].splice(idx, 1);
                if (!isPropertyNotifySignal && object.__objectSignals__[signalIndex].length === 0) {
                    // only required for "pure" signals, handled separately for properties in propertyUpdate
                    webChannel.exec({
                        type: QWebChannelMessageTypes.disconnectFromSignal,
                        object: object.__id__,
                        signal: signalIndex
                    });
                }
            }
        };
    }

    /**
     * Invokes all callbacks for the given signalname. Also works for property notify callbacks.
     */
    function invokeSignalCallbacks(signalName, signalArgs)
    {
        var connections = object.__objectSignals__[signalName];
        if (connections) {
            connections.forEach(function(callback) {
                callback.apply(callback, signalArgs);
            });
        }
    }

    this.propertyUpdate = function(signals, propertyMap)
    {
        // update property cache
        for (var propertyIndex in propertyMap) {
            var propertyValue = propertyMap[propertyIndex];
            object.__propertyCache__[propertyIndex] = propertyValue;
        }

        for (var signalName in signals) {
            // Invoke all callbacks, as signalEmitted() does not. This ensures the
            // property cache is updated before the callbacks are invoked.
            invokeSignalCallbacks(signalName, signals[signalName]);
        }
    }

    this.signalEmitted = function(signalName, signalArgs)
    {
        invokeSignalCallbacks(signalName, signalArgs);
    }

    function addMethod(methodData)
    {
        var methodName = methodData[0];
        var methodIdx = methodData[1];
        object[methodName] = function() {
            var args = [];
            var callback;
            for (var i = 0; i < arguments.length; ++i) {
                if (typeof arguments[i] === "function")
                    callback = arguments[i];
                else
                    args.push(arguments[i]);
            }

            webChannel.exec({
                "type": QWebChannelMessageTypes.invokeMethod,
                "object": object.__id__,
                "method": methodIdx,
                "args": args
            }, function(response) {
                if (response !== undefined) {
                    var result = object.unwrapQObject(response);
                    if (callback) {
                        (callback)(result);
                    }
                }
            });
        };
    }

    function bindGetterSetter(propertyInfo)
    {
        var propertyIndex = propertyInfo[0];
        var propertyName = propertyInfo[1];
        var notifySignalData = propertyInfo[2];
        // initialize property cache with current value
        // NOTE: if this is an object, it is not directly unwrapped as it might
        // reference other QObject that we do not know yet
        object.__propertyCache__[propertyIndex] = propertyInfo[3];

        if (notifySignalData) {
            if (notifySignalData[0] === 1) {
                // signal name is optimized away, reconstruct the actual name
                notifySignalData[0] = propertyName + "Changed";
            }
            addSignal(notifySignalData, true);
        }

        Object.defineProperty(object, propertyName, {
            configurable: true,
            get: function () {
                var propertyValue = object.__propertyCache__[propertyIndex];
                if (propertyValue === undefined) {
                    // This shouldn't happen
                    console.warn("Undefined value in property cache for property \"" + propertyName + "\" in object " + object.__id__);
                }

                return propertyValue;
            },
            set: function(value) {
                if (value === undefined) {
                    console.warn("Property setter for " + propertyName + " called with undefined value!");
                    return;
                }
                object.__propertyCache__[propertyIndex] = value;
                webChannel.exec({
                    "type": QWebChannelMessageTypes.setProperty,
                    "object": object.__id__,
                    "property": propertyIndex,
                    "value": value
                });
            }
        });

    }

    // ----------------------------------------------------------------------

    data.methods.forEach(addMethod);

    data.properties.forEach(bindGetterSetter);

    data.signals.forEach(function(signal) { addSignal(signal, false); });

    for (var name in data.enums) {
        object[name] = data.enums[name];
    }
}

//required for use with nodejs
if (typeof module === 'object') {
    module.exports = {
        QWebChannel: QWebChannel
    };
}



// provider.js
/******************************************************************************
Mozilla Public License Version 2.0
==================================

### 1. Definitions

**1.1. “Contributor”**
    means each individual or legal entity that creates, contributes to
    the creation of, or owns Covered Software.

**1.2. “Contributor Version”**
    means the combination of the Contributions of others (if any) used
    by a Contributor and that particular Contributor's Contribution.

**1.3. “Contribution”**
    means Covered Software of a particular Contributor.

**1.4. “Covered Software”**
    means Source Code Form to which the initial Contributor has attached
    the notice in Exhibit A, the Executable Form of such Source Code
    Form, and Modifications of such Source Code Form, in each case
    including portions thereof.

**1.5. “Incompatible With Secondary Licenses”**
    means

* **(a)** that the initial Contributor has attached the notice described
    in Exhibit B to the Covered Software; or
* **(b)** that the Covered Software was made available under the terms of
    version 1.1 or earlier of the License, but not also under the
    terms of a Secondary License.

**1.6. “Executable Form”**
    means any form of the work other than Source Code Form.

**1.7. “Larger Work”**
    means a work that combines Covered Software with other material, in
    a separate file or files, that is not Covered Software.

**1.8. “License”**
    means this document.

**1.9. “Licensable”**
    means having the right to grant, to the maximum extent possible,
    whether at the time of the initial grant or subsequently, any and
    all of the rights conveyed by this License.

**1.10. “Modifications”**
    means any of the following:

* **(a)** any file in Source Code Form that results from an addition to,
    deletion from, or modification of the contents of Covered
    Software; or
* **(b)** any new file in Source Code Form that contains any Covered
    Software.

**1.11. “Patent Claims” of a Contributor**
    means any patent claim(s), including without limitation, method,
    process, and apparatus claims, in any patent Licensable by such
    Contributor that would be infringed, but for the grant of the
    License, by the making, using, selling, offering for sale, having
    made, import, or transfer of either its Contributions or its
    Contributor Version.

**1.12. “Secondary License”**
    means either the GNU General Public License, Version 2.0, the GNU
    Lesser General Public License, Version 2.1, the GNU Affero General
    Public License, Version 3.0, or any later versions of those
    licenses.

**1.13. “Source Code Form”**
    means the form of the work preferred for making modifications.

**1.14. “You” (or “Your”)**
    means an individual or a legal entity exercising rights under this
    License. For legal entities, “You” includes any entity that
    controls, is controlled by, or is under common control with You. For
    purposes of this definition, “control” means **(a)** the power, direct
    or indirect, to cause the direction or management of such entity,
    whether by contract or otherwise, or **(b)** ownership of more than
    fifty percent (50%) of the outstanding shares or beneficial
    ownership of such entity.


### 2. License Grants and Conditions

#### 2.1. Grants

Each Contributor hereby grants You a world-wide, royalty-free,
non-exclusive license:

* **(a)** under intellectual property rights (other than patent or trademark)
    Licensable by such Contributor to use, reproduce, make available,
    modify, display, perform, distribute, and otherwise exploit its
    Contributions, either on an unmodified basis, with Modifications, or
    as part of a Larger Work; and
* **(b)** under Patent Claims of such Contributor to make, use, sell, offer
    for sale, have made, import, and otherwise transfer either its
    Contributions or its Contributor Version.

#### 2.2. Effective Date

The licenses granted in Section 2.1 with respect to any Contribution
become effective for each Contribution on the date the Contributor first
distributes such Contribution.

#### 2.3. Limitations on Grant Scope

The licenses granted in this Section 2 are the only rights granted under
this License. No additional rights or licenses will be implied from the
distribution or licensing of Covered Software under this License.
Notwithstanding Section 2.1(b) above, no patent license is granted by a
Contributor:

* **(a)** for any code that a Contributor has removed from Covered Software;
    or
* **(b)** for infringements caused by: **(i)** Your and any other third party's
    modifications of Covered Software, or **(ii)** the combination of its
    Contributions with other software (except as part of its Contributor
    Version); or
* **(c)** under Patent Claims infringed by Covered Software in the absence of
    its Contributions.

This License does not grant any rights in the trademarks, service marks,
or logos of any Contributor (except as may be necessary to comply with
the notice requirements in Section 3.4).

#### 2.4. Subsequent Licenses

No Contributor makes additional grants as a result of Your choice to
distribute the Covered Software under a subsequent version of this
License (see Section 10.2) or under the terms of a Secondary License (if
permitted under the terms of Section 3.3).

#### 2.5. Representation

Each Contributor represents that the Contributor believes its
Contributions are its original creation(s) or it has sufficient rights
to grant the rights to its Contributions conveyed by this License.

#### 2.6. Fair Use

This License is not intended to limit any rights You have under
applicable copyright doctrines of fair use, fair dealing, or other
equivalents.

#### 2.7. Conditions

Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
in Section 2.1.


### 3. Responsibilities

#### 3.1. Distribution of Source Form

All distribution of Covered Software in Source Code Form, including any
Modifications that You create or to which You contribute, must be under
the terms of this License. You must inform recipients that the Source
Code Form of the Covered Software is governed by the terms of this
License, and how they can obtain a copy of this License. You may not
attempt to alter or restrict the recipients' rights in the Source Code
Form.

#### 3.2. Distribution of Executable Form

If You distribute Covered Software in Executable Form then:

* **(a)** such Covered Software must also be made available in Source Code
    Form, as described in Section 3.1, and You must inform recipients of
    the Executable Form how they can obtain a copy of such Source Code
    Form by reasonable means in a timely manner, at a charge no more
    than the cost of distribution to the recipient; and

* **(b)** You may distribute such Executable Form under the terms of this
    License, or sublicense it under different terms, provided that the
    license for the Executable Form does not attempt to limit or alter
    the recipients' rights in the Source Code Form under this License.

#### 3.3. Distribution of a Larger Work

You may create and distribute a Larger Work under terms of Your choice,
provided that You also comply with the requirements of this License for
the Covered Software. If the Larger Work is a combination of Covered
Software with a work governed by one or more Secondary Licenses, and the
Covered Software is not Incompatible With Secondary Licenses, this
License permits You to additionally distribute such Covered Software
under the terms of such Secondary License(s), so that the recipient of
the Larger Work may, at their option, further distribute the Covered
Software under the terms of either this License or such Secondary
License(s).

#### 3.4. Notices

You may not remove or alter the substance of any license notices
(including copyright notices, patent notices, disclaimers of warranty,
or limitations of liability) contained within the Source Code Form of
the Covered Software, except that You may alter any license notices to
the extent required to remedy known factual inaccuracies.

#### 3.5. Application of Additional Terms

You may choose to offer, and to charge a fee for, warranty, support,
indemnity or liability obligations to one or more recipients of Covered
Software. However, You may do so only on Your own behalf, and not on
behalf of any Contributor. You must make it absolutely clear that any
such warranty, support, indemnity, or liability obligation is offered by
You alone, and You hereby agree to indemnify every Contributor for any
liability incurred by such Contributor as a result of warranty, support,
indemnity or liability terms You offer. You may include additional
disclaimers of warranty and limitations of liability specific to any
jurisdiction.


### 4. Inability to Comply Due to Statute or Regulation

If it is impossible for You to comply with any of the terms of this
License with respect to some or all of the Covered Software due to
statute, judicial order, or regulation then You must: **(a)** comply with
the terms of this License to the maximum extent possible; and **(b)**
describe the limitations and the code they affect. Such description must
be placed in a text file included with all distributions of the Covered
Software under this License. Except to the extent prohibited by statute
or regulation, such description must be sufficiently detailed for a
recipient of ordinary skill to be able to understand it.


### 5. Termination

**5.1.** The rights granted under this License will terminate automatically
if You fail to comply with any of its terms. However, if You become
compliant, then the rights granted under this License from a particular
Contributor are reinstated **(a)** provisionally, unless and until such
Contributor explicitly and finally terminates Your grants, and **(b)** on an
ongoing basis, if such Contributor fails to notify You of the
non-compliance by some reasonable means prior to 60 days after You have
come back into compliance. Moreover, Your grants from a particular
Contributor are reinstated on an ongoing basis if such Contributor
notifies You of the non-compliance by some reasonable means, this is the
first time You have received notice of non-compliance with this License
from such Contributor, and You become compliant prior to 30 days after
Your receipt of the notice.

**5.2.** If You initiate litigation against any entity by asserting a patent
infringement claim (excluding declaratory judgment actions,
counter-claims, and cross-claims) alleging that a Contributor Version
directly or indirectly infringes any patent, then the rights granted to
You by any and all Contributors for the Covered Software under Section
2.1 of this License shall terminate.

**5.3.** In the event of termination under Sections 5.1 or 5.2 above, all
end user license agreements (excluding distributors and resellers) which
have been validly granted by You or Your distributors under this License
prior to termination shall survive termination.


### 6. Disclaimer of Warranty

> Covered Software is provided under this License on an “as is”
> basis, without warranty of any kind, either expressed, implied, or
> statutory, including, without limitation, warranties that the
> Covered Software is free of defects, merchantable, fit for a
> particular purpose or non-infringing. The entire risk as to the
> quality and performance of the Covered Software is with You.
> Should any Covered Software prove defective in any respect, You
> (not any Contributor) assume the cost of any necessary servicing,
> repair, or correction. This disclaimer of warranty constitutes an
> essential part of this License. No use of any Covered Software is
> authorized under this License except under this disclaimer.

### 7. Limitation of Liability

> Under no circumstances and under no legal theory, whether tort
> (including negligence), contract, or otherwise, shall any
> Contributor, or anyone who distributes Covered Software as
> permitted above, be liable to You for any direct, indirect,
> special, incidental, or consequential damages of any character
> including, without limitation, damages for lost profits, loss of
> goodwill, work stoppage, computer failure or malfunction, or any
> and all other commercial damages or losses, even if such party
> shall have been informed of the possibility of such damages. This
> limitation of liability shall not apply to liability for death or
> personal injury resulting from such party's negligence to the
> extent applicable law prohibits such limitation. Some
> jurisdictions do not allow the exclusion or limitation of
> incidental or consequential damages, so this exclusion and
> limitation may not apply to You.


### 8. Litigation

Any litigation relating to this License may be brought only in the
courts of a jurisdiction where the defendant maintains its principal
place of business and such litigation shall be governed by laws of that
jurisdiction, without reference to its conflict-of-law provisions.
Nothing in this Section shall prevent a party's ability to bring
cross-claims or counter-claims.


### 9. Miscellaneous

This License represents the complete agreement concerning the subject
matter hereof. If any provision of this License is held to be
unenforceable, such provision shall be reformed only to the extent
necessary to make it enforceable. Any law or regulation which provides
that the language of a contract shall be construed against the drafter
shall not be used to construe this License against a Contributor.


### 10. Versions of the License

#### 10.1. New Versions

Mozilla Foundation is the license steward. Except as provided in Section
10.3, no one other than the license steward has the right to modify or
publish new versions of this License. Each version will be given a
distinguishing version number.

#### 10.2. Effect of New Versions

You may distribute the Covered Software under the terms of the version
of the License under which You originally received the Covered Software,
or under the terms of any subsequent version published by the license
steward.

#### 10.3. Modified Versions

If you create software not governed by this License, and you want to
create a new license for such software, you may create and use a
modified version of this License if you rename the license and remove
any references to the name of the license steward (except to note that
such modified license differs from this License).

#### 10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses

If You choose to distribute Source Code Form that is Incompatible With
Secondary Licenses under the terms of this version of the License, the
notice described in Exhibit B of this License must be attached.

## Exhibit A - Source Code Form License Notice

    This Source Code Form is subject to the terms of the Mozilla Public
    License, v. 2.0. If a copy of the MPL was not distributed with this
    file, You can obtain one at http://mozilla.org/MPL/2.0/.

If it is not possible or desirable to put the notice in a particular
file, then You may include the notice in a location (such as a LICENSE
file in a relevant directory) where a recipient would be likely to look
for such a notice.

You may add additional accurate notices of copyright ownership.

## Exhibit B - “Incompatible With Secondary Licenses” Notice

    This Source Code Form is "Incompatible With Secondary Licenses", as
    defined by the Mozilla Public License, v. 2.0.

 */

(function(){
  // Based on
  // https://github.com/status-im/status-react/blob/f9fb4d6974138a276b0cdcc6e4ea1611063e70ca/resources/js/provider.js
  if(typeof EthereumProvider === "undefined"){
    let callbackId = 0;
    let callbacks = {};

    const onMessage = function(message){
      try {
        const data = JSON.parse(message);
        const id = data.messageId;
        const callback = callbacks[id];

        if(data.type === "web3-disconnect-account") {
            window.statusAppcurrentAccountAddress = "";
            window.ethereum.emit("accountsChanged", []);
            return;
        }

        if (callback) {
          if (data.type === "api-response") {
            if (data.permission == "qr-code") {
              qrCodeResponse(data, callback); // TODO: are we going to support the qr-code permission?
            } else if (data.isAllowed) {
              if (data.permission == "web3") {
                window.statusAppcurrentAccountAddress = data.data[0];
              }
              callback.resolve(data.data);
            } else {
              callback.reject(new UserRejectedRequest());
            }
          } else if (data.type === "web3-send-async-callback") {
            if (callback.beta) {
              if (data.error) {
                if (data.error.code == 4100) {
                  callback.reject(new Unauthorized());
                } else {
                  callback.reject(data.error);
                }
              } else {
                callback.resolve(data.result.result);
              }
            } else if (callback.results) {
              callback.results.push(data.error || data.result);
              if (callback.results.length == callback.num)
                callback.callback(undefined, callback.results);
            } else {
                callback.callback(data.error, data.result);
            }
          }
        }
      } catch(e) {
          console.error(e)
      }
    }
    
    let backend;
    new QWebChannel(qt.webChannelTransport, function(channel) {
      backend = channel.objects.backend;
      backend.web3Response.connect(onMessage);
    
      window.ethereum.on("connected", () => {}); // TODO: Dummy event. Will need to be replaced once connecte/disconnected provider logic is implemented in status-go
      window.ethereum.emit("connected", {"chainId": backend.networkId.toString()});
    });

    const bridgeSend = data => {
        data.hostname = new URL(document.location).host;
        data.title = document.title;
        backend.postMessage(JSON.stringify(data));
    }

    let history = window.history;
    let pushState = history.pushState;
    history.pushState = function(state) {
      setTimeout(function () {
        bridgeSend({
          type: "history-state-changed",
          navState: { url: location.href, title: document.title },
        });
      }, 100);
      return pushState.apply(history, arguments);
    };

    function sendAPIrequest(permission, params) {
      const messageId = callbackId++;
      params = params || {};  
      
      bridgeSend({
          type: 'api-request',
          permission: permission,
          messageId: messageId,
          params: params
      });  
      
      return new Promise(function (resolve, reject) {
        params['resolve'] = resolve;
        params['reject'] = reject;
        callbacks[messageId] = params;
      });
    }

    function qrCodeResponse(data, callback){
      const result = data.data;
      const regex = new RegExp(callback.regex);
      if (!result) {
        if (callback.reject) {
          callback.reject(new Error("Cancelled"));
        }
      } else if (regex.test(result)) {
        if (callback.resolve) {
          callback.resolve(result);
        }
      } else {
        if (callback.reject) {
          callback.reject(new Error("Doesn't match"));
        }
      }
    }

    function Unauthorized() {
      this.name = "Unauthorized";
      this.id = 4100;
      this.code = 4100;
      this.message = "The requested method and/or account has not been authorized by the user.";
    }
    Unauthorized.prototype = Object.create(Error.prototype);

    function UserRejectedRequest() {
      this.name = "UserRejectedRequest";
      this.id = 4001;
      this.code = 4001;
      this.message = "The user rejected the request.";
    }
    UserRejectedRequest.prototype = Object.create(Error.prototype);

    function UnsupportedMethod() {
        this.name = "Unsupported Method";
        this.id = 4200;
        this.code = 4200;
        this.message = "The Provider does not support the requested method.";
    }
    UnsupportedMethod.prototype = Object.create(Error.prototype);

    function Disconnected() {
        this.name = "Disconnected";
        this.id = 4900;
        this.code = 4900;
        this.message = "The Provider is disconnected from all chains.";
    }
    Disconnected.prototype = Object.create(Error.prototype);

    // 
    function ChainDisconnected() {
        this.name = "Chain Disconnected";
        this.id = 4901;
        this.code = 4901;
        this.message = "The Provider is not connected to the requested chain.";
    }
    ChainDisconnected.prototype = Object.create(ChainDisconnected.prototype);


    // NOTE: chainChanged is not implemented because we do not support switching networks without disconnecting from Status
    // Provider.on('chainChanged', listener: (chainId: string) => void): Provider;

    function web3Response (payload, result){
      return {
        id: payload.id,
        jsonrpc: "2.0",
        result: result
      };
    }

    function getSyncResponse (payload) {
        if (payload.method == "eth_accounts" && (typeof window.statusAppcurrentAccountAddress !== "undefined")) {
            return web3Response(payload, [window.statusAppcurrentAccountAddress])
        } else if (payload.method == "eth_coinbase" && (typeof window.statusAppcurrentAccountAddress !== "undefined")) {
            return web3Response(payload, window.statusAppcurrentAccountAddress)
        } else if (payload.method == "net_version" || payload.method == "eth_chainId"){
            return web3Response(payload, backend.networkId.toString())
        } else if (payload.method == "eth_uninstallFilter"){
            return web3Response(payload, true);
        } else {
            return null;
        }
    }

    var StatusAPI = function () {};

    StatusAPI.prototype.getContactCode = function () {
        return sendAPIrequest('contact-code');
    };

    var EthereumProvider = function () {};

    EthereumProvider.prototype.isStatus = true;
    EthereumProvider.prototype.status = new StatusAPI();
    EthereumProvider.prototype.isConnected = function () { return true; };
    EthereumProvider.prototype._events = {};

    EthereumProvider.prototype.on = function(name, listener) {
        if (!this._events[name]) {
          this._events[name] = [];
        }
        this._events[name].push(listener);
    }

    EthereumProvider.prototype.removeListener = function (name, listenerToRemove) {
        if (!this._events[name]) throw new Error(`event "${name}" does not exist`);
        const filterListeners = (listener) => listener !== listenerToRemove;
        this._events[name] = this._events[name].filter(filterListeners);
    }

    EthereumProvider.prototype.emit = function (name, data) {
        if (!this._events[name]) throw new Error(`event "${name}" does not exist`);
        this._events[name].forEach(cb => cb(data));
    }

    EthereumProvider.prototype.enable = function () {
        return sendAPIrequest('web3');
    };

    EthereumProvider.prototype.scanQRCode = function (regex) {
        return sendAPIrequest('qr-code', {regex: regex});
    };

    EthereumProvider.prototype.request = function (requestArguments) {
      if (!requestArguments) return new Error("Request is not valid.");
        
      const method = requestArguments.method;

      if (!method) return new Error("Request is not valid.");

      //Support for legacy send method
      if (typeof method !== "string") return this.sendSync(method);

      if (method == "eth_requestAccounts") return sendAPIrequest("web3");

      const syncResponse = getSyncResponse({ method: method });
      if (syncResponse) {
        return new Promise(function (resolve, reject) {
          resolve(syncResponse.result);
        });
      }

      const messageId = callbackId++;
      const payload = {
        id: messageId,
        jsonrpc: "2.0",
        method: method,
        params: requestArguments.params,
      };  

      bridgeSend({
        type: "web3-send-async-read-only",
        messageId: messageId,
        payload: payload,
      });  

      return new Promise(function (resolve, reject) {
        callbacks[messageId] = {
          beta: true,
          resolve: resolve,
          reject: reject,
        };
      });
    };

    // (DEPRECATED) Support for legacy send method
    EthereumProvider.prototype.send = function (method, params = []) {
      return this.request({method: method, params: params});
    }

    // (DEPRECATED) Support for legacy sendSync method
    EthereumProvider.prototype.sendSync = function (payload) {
      if (payload.method == "eth_uninstallFilter") {
        this.sendAsync(payload, function (res, err) {});
      }
      const syncResponse = getSyncResponse(payload);
      if (syncResponse) return syncResponse;
      
      return web3Response(payload, null);
    };

    // (DEPRECATED) Support for legacy sendAsync method
    EthereumProvider.prototype.sendAsync = function (payload, callback) {
      const syncResponse = getSyncResponse(payload);
      if (syncResponse && callback) {
        callback(null, syncResponse);
      } else {
        const messageId = callbackId++;

        if (Array.isArray(payload)) {
          callbacks[messageId] = {
            num: payload.length,
            results: [],
            callback: callback,
          };

          for (let i in payload) {
            bridgeSend({
              type: "web3-send-async-read-only",
              messageId: messageId,
              payload: payload[i],
            });
          }
        } else {
          callbacks[messageId] = { callback: callback };
          bridgeSend({
            type: "web3-send-async-read-only",
            messageId: messageId,
            payload: payload,
          });
        }
      }
    };
  }

  window.ethereum = new EthereumProvider();

  // TODO: connected/disconnected must be emitted if we lose connection to infura. Verify if status-go emits events for that

})();