/*
    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at

        http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing,
    software distributed under the License is distributed on an
    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    KIND, either express or implied.  See the License for the
    specific language governing permissions and limitations
    under the License.
*/

/**
 * Creates the exec bridge used to notify the native code of
 * commands.
 */
var cordova = require('cordova');
var utils = require('cordova/utils');
var base64 = require('cordova/base64');

function massageArgsJsToNative (args) {
    if (!args || utils.typeName(args) !== 'Array') {
        return args;
    }
    var ret = [];
    args.forEach(function (arg, i) {
        if (utils.typeName(arg) === 'ArrayBuffer') {
            ret.push({
                CDVType: 'ArrayBuffer',
                data: base64.fromArrayBuffer(arg)
            });
        } else {
            ret.push(arg);
        }
    });
    return ret;
}

function massageMessageNativeToJs (message) {
    if (message.CDVType === 'ArrayBuffer') {
        var stringToArrayBuffer = function (str) {
            var ret = new Uint8Array(str.length);
            for (var i = 0; i < str.length; i++) {
                ret[i] = str.charCodeAt(i);
            }
            return ret.buffer;
        };
        var base64ToArrayBuffer = function (b64) {
            return stringToArrayBuffer(atob(b64));
        };
        message = base64ToArrayBuffer(message.data);
    }
    return message;
}

function convertMessageToArgsNativeToJs (message) {
    var args = [];
    if (!message || !Object.prototype.hasOwnProperty.call(message, 'CDVType')) {
        args.push(message);
    } else if (message.CDVType === 'MultiPart') {
        message.messages.forEach(function (e) {
            args.push(massageMessageNativeToJs(e));
        });
    } else {
        args.push(massageMessageNativeToJs(message));
    }
    return args;
}

var iOSExec = function () {
    var successCallback, failCallback, service, action, actionArgs;
    var callbackId = null;
    if (typeof arguments[0] !== 'string') {
        // FORMAT ONE
        successCallback = arguments[0];
        failCallback = arguments[1];
        service = arguments[2];
        action = arguments[3];
        actionArgs = arguments[4];

        // Since we need to maintain backwards compatibility, we have to pass
        // an invalid callbackId even if no callback was provided since plugins
        // will be expecting it. The Cordova.exec() implementation allocates
        // an invalid callbackId and passes it even if no callbacks were given.
        callbackId = 'INVALID';
    } else {
   	    throw new Error('The old format of this exec call has been removed (deprecated since 2.1). Change to: ' + // eslint-disable-line
            'cordova.exec(null, null, \'Service\', \'action\', [ arg1, arg2 ]);');
    }

    // If actionArgs is not provided, default to an empty array
    actionArgs = actionArgs || [];

    // Register the callbacks and add the callbackId to the positional
    // arguments if given.
    if (successCallback || failCallback) {
        callbackId = service + cordova.callbackId++;
        cordova.callbacks[callbackId] =
            { success: successCallback, fail: failCallback };
    }

    actionArgs = massageArgsJsToNative(actionArgs);

    // CB-10133 DataClone DOM Exception 25 guard (fast function remover)
    var command = [callbackId, service, action, JSON.parse(JSON.stringify(actionArgs))];
    window.webkit.messageHandlers.cordova.postMessage(command);
};

iOSExec.nativeCallback = function (callbackId, status, message, keepCallback, debug) {
    var success = status === 0 || status === 1;
    var args = convertMessageToArgsNativeToJs(message);
    Promise.resolve().then(function () {
        cordova.callbackFromNative(callbackId, success, status, args, keepCallback);
    });
};

// for backwards compatibility
iOSExec.nativeEvalAndFetch = function (func) {
    try {
        func();
    } catch (e) {
        console.log(e);
    }
};

// Proxy the exec for bridge changes. See CB-10106

function cordovaExec () {
    var cexec = require('cordova/exec');
    var cexec_valid = (typeof cexec.nativeFetchMessages === 'function') && (typeof cexec.nativeEvalAndFetch === 'function') && (typeof cexec.nativeCallback === 'function');
    return (cexec_valid && execProxy !== cexec) ? cexec : iOSExec;
}

function execProxy () {
    cordovaExec().apply(null, arguments);
}

execProxy.nativeFetchMessages = function () {
    return cordovaExec().nativeFetchMessages.apply(null, arguments);
};

execProxy.nativeEvalAndFetch = function () {
    return cordovaExec().nativeEvalAndFetch.apply(null, arguments);
};

execProxy.nativeCallback = function () {
    return cordovaExec().nativeCallback.apply(null, arguments);
};

module.exports = execProxy;
