/*******************************************************************************

    ηMatrix - a browser extension to black/white list requests.
    Copyright (C) 2014-2019 The uMatrix/uBlock Origin authors
    Copyright (C) 2019-2020 Alessio Vanni

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see {http://www.gnu.org/licenses/}.

    Home: https://libregit.org/heckyel/ematrix
    uMatrix Home: https://github.com/gorhill/uMatrix
*/

'use strict';

/******************************************************************************/

(function () {
    vAPI.cloud = (function () {
        let extensionBranchPath = 'extensions.' + location.host;
        let cloudBranchPath = extensionBranchPath + '.cloudStorage';

        // https://github.com/gorhill/uBlock/issues/80#issuecomment-132081658
        // We must use get/setComplexValue in order to properly handle strings
        // with unicode characters.
        let iss = Ci.nsISupportsString;
        let argstr = Components.classes['@mozilla.org/supports-string;1']
            .createInstance(iss);

        let options = {
            defaultDeviceName: '',
            deviceName: ''
        };

        // User-supplied device name.
        try {
            options.deviceName = Services.prefs
                .getBranch(extensionBranchPath + '.')
                .getComplexValue('deviceName', iss)
                .data;
        } catch(ex) {
            // Ignore
        }

        var getDefaultDeviceName = function() {
            var name = '';
            try {
                name = Services.prefs
                    .getBranch('services.sync.client.')
                    .getComplexValue('name', iss)
                    .data;
            } catch(ex) {
                // Ignore
            }

            return name || window.navigator.platform || window.navigator.oscpu;
        };

        let start = function (dataKeys) {
            let extensionBranch =
                Services.prefs.getBranch(extensionBranchPath + '.');
            let syncBranch =
                Services.prefs.getBranch('services.sync.prefs.sync.');

            // Mark config entries as syncable
            argstr.data = '';
            let dataKey;
            for (let i=0; i<dataKeys.length; ++i) {
                dataKey = dataKeys[i];
                if (extensionBranch.prefHasUserValue('cloudStorage.' + dataKey)
                    === false) {
                    extensionBranch.setComplexValue('cloudStorage.' + dataKey,
                                                    iss, argstr);
                }

                syncBranch.setBoolPref(cloudBranchPath + '.' + dataKey, true);
            }
        };

        let push = function (datakey, data, callback) {
            let branch = Services.prefs.getBranch(cloudBranchPath + '.');
            let bin = {
                'source': options.deviceName || getDefaultDeviceName(),
                'tstamp': Date.now(),
                'data': data,
                'size': 0
            };
            bin.size = JSON.stringify(bin).length;
            argstr.data = JSON.stringify(bin);
            branch.setComplexValue(datakey, iss, argstr);

            if (typeof callback === 'function') {
                callback();
            }
        };

        let pull = function (datakey, callback) {
            let result = null;
            let  branch = Services.prefs.getBranch(cloudBranchPath + '.');

            try {
                let json = branch.getComplexValue(datakey, iss).data;
                if (typeof json === 'string') {
                    result = JSON.parse(json);
                }
            } catch(ex) {
                // Ignore
            }

            callback(result);
        };

        let getOptions = function (callback) {
            if (typeof callback !== 'function') {
                return;
            }

            options.defaultDeviceName = getDefaultDeviceName();
            callback(options);
        };

        let setOptions = function (details, callback) {
            if (typeof details !== 'object' || details === null) {
                return;
            }

            let branch = Services.prefs.getBranch(extensionBranchPath + '.');

            if (typeof details.deviceName === 'string') {
                argstr.data = details.deviceName;
                branch.setComplexValue('deviceName', iss, argstr);
                options.deviceName = details.deviceName;
            }

            getOptions(callback);
        };

        return {
            start: start,
            push: push,
            pull: pull,
            getOptions: getOptions,
            setOptions: setOptions
        };
    })();
})();