//----------------------------------------------------------------------------
//  Copyright (C) 2012 The IPython Development Team
//
//  Distributed under the terms of the BSD License.  The full license is in
//  the file COPYING, distributed as part of this software.
//----------------------------------------------------------------------------

//============================================================================
// Notification widget
//============================================================================

var IPython = (function (IPython) {
    "use strict";
    var utils = IPython.utils;


    var NotificationArea = function (selector) {
        this.selector = selector;
        if (this.selector !== undefined) {
            this.element = $(selector);
        }
        this.widget_dict = {};
    };

    NotificationArea.prototype.temp_message = function (msg, timeout, css_class) {
        var uuid = utils.uuid();
        if( css_class == 'danger') {css_class = 'ui-state-error';}
        if( css_class == 'warning') {css_class = 'ui-state-highlight';}
        var tdiv = $('<div>')
            .attr('id',uuid)
            .addClass('notification_widget ui-widget ui-widget-content ui-corner-all')
            .addClass('border-box-sizing')
            .addClass(css_class)
            .hide()
            .text(msg);

        $(this.selector).append(tdiv);
        var tmout = Math.max(1500,(timeout||1500));
        tdiv.fadeIn(100);

        setTimeout(function () {
                tdiv.fadeOut(100, function () {tdiv.remove();});
            }, tmout);
    };

    NotificationArea.prototype.widget = function(name) {
        if(this.widget_dict[name] == undefined) {
            return this.new_notification_widget(name);
        }
        return this.get_widget(name);
    };

    NotificationArea.prototype.get_widget = function(name) {
        if(this.widget_dict[name] == undefined) {
            throw('no widgets with this name');
        }
        return this.widget_dict[name];
    };

    NotificationArea.prototype.new_notification_widget = function(name) {
        if(this.widget_dict[name] != undefined) {
            throw('widget with that name already exists ! ');
        }
        var div = $('<div/>').attr('id','notification_'+name);
        $(this.selector).append(div);
        this.widget_dict[name] = new IPython.NotificationWidget('#notification_'+name);
        return this.widget_dict[name];
    };

    NotificationArea.prototype.init_notification_widgets = function() {
        var knw = this.new_notification_widget('kernel');

        // Kernel events
        $([IPython.events]).on('status_idle.Kernel',function () {
            IPython.save_widget.update_document_title();
            knw.set_message('Kernel Idle',200);
            }
        );

        $([IPython.events]).on('status_busy.Kernel',function () {
            window.document.title='(Busy) '+window.document.title;
            knw.set_message("Kernel busy");
        });

        $([IPython.events]).on('status_restarting.Kernel',function () {
            IPython.save_widget.update_document_title();
            knw.set_message("Restarting kernel",1000);
        });

        $([IPython.events]).on('status_interrupting.Kernel',function () {
            knw.set_message("Interrupting kernel");
        });

        $([IPython.events]).on('status_dead.Kernel',function () {
            var dialog = $('<div/>');
            dialog.html('The kernel has died, would you like to restart it?' +
                ' If you do not restart the kernel, you will be able to save' +
                ' the notebook, but running code will not work until the notebook' +
                ' is reopened.'
            );
            $(document).append(dialog);
            dialog.dialog({
                resizable: false,
                modal: true,
                title: "Dead kernel",
                close: function(event, ui) {$(this).dialog('destroy').remove();},
                buttons : {
                    "Restart": function () {
                        $([IPython.events]).trigger('status_restarting.Kernel');
                        IPython.notebook.start_kernel();
                        $(this).dialog('close');
                    },
                    "Don't restart": function () {
                        $(this).dialog('close');
                    }
                }
            });
        });

        $([IPython.events]).on('websocket_closed.Kernel', function (event, data) {
            var kernel = data.kernel;
            var ws_url = data.ws_url;
            var early = data.early;
            var msg;
            if (!early) {
                    knw.set_message('Reconnecting WebSockets', 1000);
                    setTimeout(function () {
                        kernel.start_channels();
                    }, 5000);
                return;
            }
            console.log('WebSocket connection failed: ', ws_url)
            msg = "A WebSocket connection to could not be established." +
                " You will NOT be able to run code. Check your" +
                " network connection or notebook server configuration.";
            var dialog = $('<div/>');
            dialog.html(msg);
            $(document).append(dialog);
            dialog.dialog({
                resizable: false,
                modal: true,
                title: "WebSocket connection failed",
                closeText: "",
                close: function(event, ui) {$(this).dialog('destroy').remove();},
                buttons : {
                    "OK": function () {
                        $(this).dialog('close');
                    },
                    "Reconnect": function () {
                        knw.set_message('Reconnecting WebSockets', 1000);
                        setTimeout(function () {
                            kernel.start_channels();
                        }, 5000);
                        $(this).dialog('close');
                    }
                }
            });
        });


        var nnw = this.new_notification_widget('notebook');

        // Notebook events
        $([IPython.events]).on('notebook_loading.Notebook', function () {
            nnw.set_message("Loading notebook",500);
        });
        $([IPython.events]).on('notebook_loaded.Notebook', function () {
            nnw.set_message("Notebook loaded",500);
        });
        $([IPython.events]).on('notebook_saving.Notebook', function () {
            nnw.set_message("Saving notebook",500);
        });
        $([IPython.events]).on('notebook_saved.Notebook', function () {
            nnw.set_message("Notebook saved",2000);
        });
        $([IPython.events]).on('notebook_save_failed.Notebook', function () {
            nnw.set_message("Notebook save failed");
        });

    };

    IPython.NotificationArea = NotificationArea;

    return IPython;

}(IPython));