/*
 * Copyright (C) 2014 Glyptodon LLC
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

/**
 * A service for creating Guacamole clients.
 */
angular.module('client').factory('guacClientFactory', ['$rootScope',
        function guacClientFactory($rootScope) {

    var service = {};

    /**
     * Returns a new Guacamole client instance which connects using the
     * provided tunnel.
     *
     * @param {Scope} $scope The current scope.
     * @param {Guacamole.Tunnel} tunnel The tunnel to connect through.
     * @returns {Guacamole.Client} A new Guacamole client instance.
     */
    service.getInstance = function getClientInstance($scope, tunnel) {

        // Instantiate client
        var guacClient  = new Guacamole.Client(tunnel);

        /*
         * Fire guacClientStateChange events when client state changes.
         */
        guacClient.onstatechange = function onClientStateChange(clientState) {
            $scope.safeApply(function() {

                switch (clientState) {

                    // Idle
                    case 0:
                        $scope.$emit('guacClientStateChange', guacClient, "idle");
                        break;

                    // Connecting
                    case 1:
                        $scope.$emit('guacClientStateChange', guacClient, "connecting");
                        break;

                    // Connected + waiting
                    case 2:
                        $scope.$emit('guacClientStateChange', guacClient, "waiting");
                        break;

                    // Connected
                    case 3:
                        $scope.$emit('guacClientStateChange', guacClient, "connected");
                        break;

                    // Disconnecting / disconnected are handled by tunnel instead
                    case 4:
                    case 5:
                        break;

                }

            });
        };
        
        /*
         * Fire guacClientName events when a new name is received.
         */
        guacClient.onname = function onClientName(name) {
            $scope.safeApply(function() {
                $scope.$emit('guacClientName', guacClient, name);
            });
        };

        /*
         * Disconnect and fire guacClientError when the client receives an
         * error.
         */
        guacClient.onerror = function onClientError(status) {
            $scope.safeApply(function() {

                // Disconnect, if connected
                guacClient.disconnect();
                
                $scope.$emit('guacClientError', guacClient, status.code);

            });
        };

        /*
         * Fire guacClientClipboard events after new clipboard data is received.
         */
        guacClient.onclipboard = function onClientClipboard(stream, mimetype) {
            $scope.safeApply(function() {

                // Only text/plain is supported for now
                if (mimetype !== "text/plain") {
                    stream.sendAck("Only text/plain supported", Guacamole.Status.Code.UNSUPPORTED);
                    return;
                }

                var reader = new Guacamole.StringReader(stream);
                var data = "";

                // Append any received data to buffer
                reader.ontext = function clipboard_text_received(text) {
                    data += text;
                    stream.sendAck("Received", Guacamole.Status.Code.SUCCESS);
                };

                // Emit event when done
                reader.onend = function clipboard_text_end() {
                    $scope.$emit('guacClientClipboard', guacClient, mimetype, data);
                };

            });
        };

        /*
         * Fire guacFileStart, guacFileProgress, and guacFileEnd events during
         * the receipt of files.
         */
        guacClient.onfile = function onClientFile(stream, mimetype, filename) {
            $scope.safeApply(function() {

                // Begin file download
                var guacFileStartEvent = $scope.$emit('guacClientFileStart', guacClient, stream.index, mimetype, filename);
                if (!guacFileStartEvent.defaultPrevented) {

                    var blob_reader = new Guacamole.BlobReader(stream, mimetype);

                    // Update progress as data is received
                    blob_reader.onprogress = function onprogress() {
                        $scope.$emit('guacClientFileProgress', guacClient, stream.index, mimetype, filename, blob_reader.getLength());
                        stream.sendAck("Received", Guacamole.Status.Code.SUCCESS);
                    };

                    // When complete, prompt for download
                    blob_reader.onend = function onend() {
                        $scope.$emit('guacClientFileEnd', guacClient, stream.index, mimetype, filename, blob_reader.getBlob());
                    };

                    stream.sendAck("Ready", Guacamole.Status.Code.SUCCESS);
                    
                }
                
                // Respond with UNSUPPORTED if download (default action) canceled within event handler
                else
                    stream.sendAck("Download canceled", Guacamole.Status.Code.UNSUPPORTED);

            });
        };

        return guacClient;
        
    };

    return service;

}]);