!function (factory) {
    if (typeof define === 'function' && define.amd) {
        define([], function () {
            return factory(window.jQuery);
        });
    }
}(function ($) {
    'use strict';

    function Editor(element, options) {
        this.selectedRange = null;
        this.container = $(element);

        var editor = $('<div class="editor-content"></div>');
        this.container.find('.editor-content').remove();
        this.container.append(editor);
        this.editor = editor;

        var defaults = {
            toolbarSelector: '.editor-toolbar',
            commandRole: 'edit',
            activeToolbarClass: 'selected',
            selectionColor: 'darkgray'
        };
        var opts = $.extend(true, {}, defaults, options);
        var toolbarBtnSelector = 'a[data-' + opts.commandRole + '],button[data-' + opts.commandRole + '],input[type=button][data-' + opts.commandRole + ']';
        this.bindHotkeys(editor, opts, toolbarBtnSelector);
        this.bindToolbar(editor, this.container.find(opts.toolbarSelector), opts, toolbarBtnSelector);

        editor.attr('contenteditable', true).on('mouseup keyup mouseout', function () {
            this.saveSelection();
            this.updateToolbar(toolbarBtnSelector, opts);
        }.bind(this));

        $(window).bind('touchend', function (e) {
            if (!this.getCurrentRange) {
                return;
            }

            var inside = (editor.is(e.target) || editor.has(e.target).length > 0),
                currentRange = this.getCurrentRange(),
                clear = currentRange && (currentRange.startContainer === currentRange.endContainer && currentRange.startOffset === currentRange.endOffset);

            if (!clear || inside) {
                this.saveSelection();
                this.updateToolbar(toolbarBtnSelector, opts);
            }
        });
    }

    Editor.prototype.cleanHtml = function () {
        var html = this.editor.html();
        return html && html.replace(/(\<br\>|\s|\<div\>\<br\>\<\/div\>|&nbsp;)*$/g, '');
    };

    Editor.prototype.updateToolbar = function (selector, options) {
        if (options.activeToolbarClass) {
            this.container.find(options.toolbarSelector).find(selector).each(function () {
                var This = $(this);
                var commandArray = This.data(options.commandRole).split(' ');
                var command = commandArray[0];
                if (commandArray.length > 1 && document.queryCommandEnabled(command) && document.queryCommandValue(command) === commandArray[1]) {
                    This.addClass(options.activeToolbarClass);
                } else if (commandArray.length === [1] && document.queryCommandEnabled(command) && document.queryCommandState(command)) {
                    This.addClass(options.activeToolbarClass);
                } else {
                    This.removeClass(options.activeToolbarClass);
                }
            });
        }
    };

    Editor.prototype.execCommand = function (commandWithArgs, valueArg, editor, options, selector) {
        var commandArray = commandWithArgs.split(' '),
            command = commandArray.shift(),
            args = commandArray.join(' ') + (valueArg || '');
        var parts = commandWithArgs.split('-');
        if (parts.length === 1) {
            document.execCommand(command, false, args);
        } else if (parts.length === 2) {
            document.execCommand(parts[0], false, parts[1]);
        }
        editor.trigger('change');
        this.updateToolbar(selector, options);
    };

    Editor.prototype.bindHotkeys = function (editor, options, selector) {
        var This = this;
        editor.on('keydown', function (e) {
            if (e.key === 'Tab') {
                var command = e.shiftKey ? 'outdent' : 'indent';
                e.preventDefault();
                e.stopPropagation();
                This.execCommand(command, null, editor, options, selector);
            }
        }).on('keyup', function () {
            editor.trigger('change');
        });
    };

    Editor.prototype.getCurrentRange = function () {
        var sel, range;
        if (window.getSelection) {
            sel = window.getSelection();
            if (sel.getRangeAt && sel.rangeCount) {
                range = sel.getRangeAt(0);
            }
        } else if (document.selection) {
            range = document.selection.createRange();
        }
        return range;
    };

    Editor.prototype.saveSelection = function () {
        this.selectedRange = this.getCurrentRange();
    }

    Editor.prototype.restoreSelection = function () {
        var selection;
        if (window.getSelection || document.createRange) {
            selection = window.getSelection();
            if (this.selectedRange) {
                try {
                    selection.removeAllRanges();
                } catch {
                    document.body.createTextRange().select();
                    document.selection.empty();
                }
                selection.addRange(this.selectedRange);
            }
        } else if (document.selection && this.selectedRange) {
            this.selectedRange.select();
        }
    };

    Editor.prototype.markSelection = function (color) {
        this.restoreSelection();
        if (document.queryCommandSupported('hiliteColor')) {
            document.execCommand('hiliteColor', false, color || 'transparent');
        }
        this.saveSelection();
    };

    Editor.prototype.bindToolbar = function (editor, toolbar, options, selector) {
        var This = this;
        toolbar.find(selector).on('click', function () {
            var command = $(this).data(options.commandRole);
            if (command === 'createlink') {
                var link = prompt('Write the URL here', 'https:\/\/');
                This.restoreSelection();
                editor.focus();
                if (link == null || link === '' || link === 'https:\/\/') {
                    This.saveSelection();
                    return;
                }
                This.execCommand(command, link, editor, options, selector);
            } else {
                This.restoreSelection();
                editor.focus();
                This.execCommand(command, null, editor, options, selector);
                This.saveSelection();
            }
        });
        toolbar.find('select').on('change', function () {
            var command = $(this).data(options.commandRole);
            var value = $(this).val();
            if (value == null || value === '') {
                editor.focus();
                return;
            }
            This.execCommand(command + '-' + value, null, editor, options, selector);
            editor.focus();
            this.selectedIndex = 0;
        });
    };

    return Editor;
});