(function($) {
    'use strict';

    $.Browser = {
        defaults: {
            title: _('Choose Directory'),
            url: srRoot + '/browser/',
            autocompleteURL: srRoot + '/browser/complete',
            includeFiles: 0,
            fileTypes: [], // File extensions to include, 'images' is an alias for image types
            showBrowseButton: true
        }
    };

    let fileBrowserDialog = null;
    let currentBrowserPath = null;
    let currentRequest = null;

    function browse(path, endpoint, includeFiles, fileTypes) {
        if (currentBrowserPath === path) {
            return;
        }

        currentBrowserPath = path;

        if (currentRequest) {
            currentRequest.abort();
        }

        fileBrowserDialog.dialog('option', 'dialogClass', 'browserDialog busy');

        currentRequest = $.getJSON(endpoint, {
            path: path,
            includeFiles: includeFiles,
            fileTypes: fileTypes.join(',')
        }, function(data) {
            fileBrowserDialog.empty();
            const firstVal = data[0];
            let i = 0;
            let list = null;
            let link = null;
            data = $.grep(data, function() {
                return i++ !== 0;
            });

            $('<input type="text" class="form-control input-sm">').val(firstVal.currentPath).on('keypress', function(e) {
                if (e.which === 13) {
                    browse(e.target.value, endpoint, includeFiles, fileTypes);
                }
            }).appendTo(fileBrowserDialog).fileBrowser({
                showBrowseButton: false
            }).on('autocompleteselect', function(e, ui) {
                browse(ui.item.value, endpoint, includeFiles, fileTypes);
            });

            list = $('<ul>').appendTo(fileBrowserDialog);
            $.each(data, function(i, entry) {
                if (entry.isFile && fileTypes && (!entry.isAllowed || fileTypes.indexOf('images') !== -1 && !entry.isImage)) { // eslint-disable-line no-mixed-operators
                    return true;
                }
                link = $('<a href="javascript:void(0)">').on('click', function() {
                    if (entry.isFile) {
                        currentBrowserPath = entry.path;
                        $('.browserDialog .ui-button:contains("Ok")').click();
                    } else {
                        browse(entry.path, endpoint, includeFiles, fileTypes);
                    }
                }).text(entry.name);
                if (entry.isImage) {
                    link.prepend('<span class="ui-icon ui-icon-image"></span>');
                } else if (entry.isFile) {
                    link.prepend('<span class="ui-icon ui-icon-document"></span>');
                } else {
                    link.prepend('<span class="ui-icon ui-icon-folder-collapsed"></span>')
                    .on('mouseenter', function() {
                        $('span', this).addClass('ui-icon-folder-open');
                    })
                    .on('mouseleave', function() {
                        $('span', this).removeClass('ui-icon-folder-open');
                    });
                }
                link.appendTo(list);
            });
            $('a', list).wrap('<li class="ui-state-default ui-corner-all">');
            fileBrowserDialog.dialog('option', 'dialogClass', 'browserDialog');
        });
    }

    $.fn.nFileBrowser = function(callback, options) {
        options = $.extend({}, $.Browser.defaults, options);

        // Make a fileBrowserDialog object if one doesn't exist already
        if (fileBrowserDialog) {
            // The title may change, even if fileBrowserDialog already exists
            fileBrowserDialog.dialog('option', 'title', options.title);
        } else {
            // Set up the jquery dialog
            fileBrowserDialog = $('<div class="fileBrowserDialog" style="display:none"></div>').appendTo('body').dialog({
                dialogClass: 'browserDialog',
                title: options.title,
                position: {my: 'center top', at: 'center top+60', of: window},
                minWidth: Math.min($(document).width() - 80, 650),
                height: Math.min($(document).height() - 80, $(window).height() - 80),
                maxHeight: Math.min($(document).height() - 80, $(window).height() - 80),
                maxWidth: $(document).width() - 80,
                modal: true,
                autoOpen: false
            });
        }

        fileBrowserDialog.dialog('option', 'buttons', [{
            text: 'Ok',
            class: 'btn',
            click: function() {
                // Store the browsed path to the associated text field
                callback(options.includeFiles ? currentBrowserPath : $(this).find('.fileBrowserField').val(), options);
                $(this).dialog('close');
            }
        }, {
            text: 'Cancel',
            class: 'btn',
            click: function() {
                $(this).dialog('close');
            }
        }]);

        // Set up the browser and launch the dialog
        let initialDir = '';
        if (options.initialDir) {
            initialDir = options.initialDir;
        }

        browse(initialDir, options.url, options.includeFiles, options.fileTypes);
        fileBrowserDialog.dialog('open');

        return false;
    };

    $.fn.fileBrowser = function(options) {
        options = $.extend({}, $.Browser.defaults, options);
        // Text field used for the result
        options.field = $(this);

        if (options.field.autocomplete && options.autocompleteURL) {
            let query = '';
            options.field.autocomplete({
                position: {my: 'top', at: 'bottom', collision: 'flipfit'},
                source: function(request, response) {
                    // Keep track of user submitted search term
                    query = $.ui.autocomplete.escapeRegex(request.term, options.includeFiles);
                    $.ajax({
                        url: options.autocompleteURL,
                        data: request,
                        dataType: 'json',
                        success: function(data) {
                            // Implement a startsWith filter for the results
                            const matcher = new RegExp('^' + query, 'i');
                            const a = $.grep(data, function(item) {
                                return matcher.test(item);
                            });
                            response(a);
                        }
                    });
                },
                open: function() {
                    $('.ui-autocomplete li.ui-menu-item a').removeClass('ui-corner-all');
                }
            }).data('ui-autocomplete')._renderItem = function(ul, item) {
                // Highlight the matched search term from the item -- note that this is global and will match anywhere
                let resultItem = item.label;
                const x = new RegExp('(?![^&;]+;)(?!<[^<>]*)(' + query + ')(?![^<>]*>)(?![^&;]+;)', 'gi');
                resultItem = resultItem.replace(x, function(fullMatch) {
                    return '<b>' + fullMatch + '</b>';
                });
                return $('<li></li>')
                    .data('ui-autocomplete-item', item)
                    .append('<a class="nowrap">' + resultItem + '</a>')
                    .appendTo(ul);
            };
        }

        let path = false;
        let callback = false;
        let ls = false;
        // If the text field is empty and we're given a key then populate it with the last browsed value from localStorage
        try {
            ls = Boolean(localStorage.getItem);
        } catch (e) {}
        if (ls && options.key) {
            path = localStorage['fileBrowser-' + options.key];
        }
        if (options.key && options.field.val().length === 0 && path) {
            options.field.val(path);
        }

        callback = function(path, options) {
            options.field.val(path);

            // Use a localStorage to remember for next time -- no ie6/7
            if (ls && options.key) {
                localStorage['fileBrowser-' + options.key] = path;
            }
        };

        options.field.addClass('fileBrowserField');
        if (options.showBrowseButton) {
            // Append the browse button and give it a click behaviour
            options.field.after(
                $('<input type="button" value="Browse&hellip;" class="btn btn-inline fileBrowser">').on('click', function() {
                    const initialDir = options.field.val() || (options.key && path) || '';
                    const optionsWithInitialDir = $.extend({}, options, {initialDir: initialDir});
                    $(this).nFileBrowser(callback, optionsWithInitialDir);
                    return false;
                })
            );
        }
        return options.field;
    };
})(jQuery);
