(function () {
    const WANG_EDITOR_VERSION = '5.7.3';
    const DEFAULT_HEIGHT = 500;
    const DEFAULT_TOOLBAR_KEYS = [
        'headerSelect',
        '|',
        'bold',
        'underline',
        'italic',
        '|',
        'bulletedList',
        'numberedList',
        '|',
        'justifyLeft',
        'justifyCenter',
        'justifyRight',
        '|',
        'insertLink',
        'uploadImage',
        'uploadVideo',
        '|',
        'undo',
        'redo'
    ];
    const DEFAULT_IMAGE_HOVERBAR_KEYS = [
        'imageWidth30',
        'imageWidth50',
        'imageWidth100',
        'editorImageSizeMenu',
        'editImage',
        'deleteImage'
    ];
    const DEFAULT_VIDEO_HOVERBAR_KEYS = [
        'enter',
        'editVideoSize',
        'editVideoSrc'
    ];

    function tip(message, type) {
        message = message || '文件上传失败';
        if (window.$ && $.msg && typeof $.msg.tips === 'function') return $.msg.tips(message);
        if (window.layer && typeof window.layer.msg === 'function') return window.layer.msg(message);
        return (type === 'error' ? console.error : console.log)(message);
    }

    function firstTextarea(ele) {
        const $ele = $(ele).eq(0);
        if ($ele.length < 1) throw new Error('Editor target not found: ' + ele);
        return $ele;
    }

    function toNumber(value, fallback) {
        value = parseFloat(value);
        return Number.isFinite(value) ? value : fallback;
    }

    function toInteger(value, fallback) {
        value = parseInt(value, 10);
        return Number.isFinite(value) ? value : fallback;
    }

    function getConfig($ele, option) {
        option = option || {};
        const data = $ele.data() || {};
        const upload = option.upload || {};
        const path = String(upload.path || option.uploadPath || data.path || 'editor').replace(/\W/g, '');
        return {
            mode: option.mode || data.editorMode || 'default',
            height: toInteger(option.height || data.editorHeight || data.height, DEFAULT_HEIGHT),
            placeholder: option.placeholder || data.placeholder || '请输入内容...',
            uploadPath: path || 'editor',
            uploadType: upload.uptype || upload.type || option.uptype || data.uptype || '',
            uploadSafe: (upload.safe || option.safe || data.safe) ? 1 : 0,
            uploadHide: (upload.hide || option.hide || data.hload) ? 1 : 0,
            uploadSize: toInteger(upload.size || option.size || data.size, 0),
            uploadQuality: toNumber(upload.quality || option.quality || data.quality, 1),
            imageMaxWidth: toInteger(upload.maxWidth || option.maxWidth || data.maxWidth, 0),
            imageMaxHeight: toInteger(upload.maxHeight || option.maxHeight || data.maxHeight, 0),
            imageCutWidth: toInteger(upload.cutWidth || option.cutWidth || data.cutWidth, 0),
            imageCutHeight: toInteger(upload.cutHeight || option.cutHeight || data.cutHeight, 0),
            toolbarKeys: option.toolbarKeys || data.toolbarKeys || DEFAULT_TOOLBAR_KEYS,
            hoverbarKeys: option.hoverbarKeys || {
                image: {menuKeys: option.imageHoverbarKeys || DEFAULT_IMAGE_HOVERBAR_KEYS},
                video: {menuKeys: option.videoHoverbarKeys || DEFAULT_VIDEO_HOVERBAR_KEYS}
            },
            excludeKeys: option.excludeKeys || ['fullScreen']
        };
    }

    function uploadBySystem(file, config, type, insertFn) {
        if (!window.SystemUploadAdapter) {
            const message = '后台上传模块尚未加载，请刷新页面后重试';
            tip(message, 'error');
            return Promise.reject(new Error(message));
        }

        file.path = config.uploadPath;
        file.quality = config.uploadQuality;
        file.maxWidth = type === 'image' ? config.imageMaxWidth : 0;
        file.maxHeight = type === 'image' ? config.imageMaxHeight : 0;
        file.cutWidth = type === 'image' ? config.imageCutWidth : 0;
        file.cutHeight = type === 'image' ? config.imageCutHeight : 0;

        return new Promise(function (resolve, reject) {
            const $scope = $('<span></span>');
            const fail = function (event, data) {
                const message = (data && data.file && data.file.xstats) || '文件上传失败';
                $scope.off('upload.error', fail);
                tip(message, 'error');
                reject(new Error(message));
            };
            $scope.one('upload.error', fail);

            new window.SystemUploadAdapter({
                elem: $scope,
                hide: config.uploadHide,
                safe: config.uploadSafe,
                type: config.uploadType,
                size: config.uploadSize
            }).upload([file], function (url, uploadedFile) {
                $scope.off('upload.error', fail);
                uploadedFile = uploadedFile || file;
                if (type === 'video') {
                    insertFn(url, '');
                } else {
                    // 第三个参数是图片链接 href，后台编辑场景不自动加链接，避免点击图片跳转导致编辑丢失。
                    insertFn(url, uploadedFile.name || file.name || '');
                }
                resolve(url);
            });
        });
    }

    function buildMenuConfig(config) {
        return {
            uploadImage: {
                async customUpload(file, insertFn) {
                    return uploadBySystem(file, config, 'image', insertFn);
                }
            },
            uploadVideo: {
                async customUpload(file, insertFn) {
                    return uploadBySystem(file, config, 'video', insertFn);
                }
            }
        };
    }

    window.createEditor = function (ele, option) {
        const $ele = firstTextarea(ele);
        const exists = $ele.data('editorInstance');
        if (exists) return exists;
        if (!window.wangEditor || typeof window.wangEditor.createEditor !== 'function') {
            throw new Error('wangEditor is not loaded.');
        }

        const config = getConfig($ele, option);
        const $layout = $('<div class="ta-editor-layout"><div class="ta-editor-toolbar"></div><div class="ta-editor-body"></div></div>');
        $layout.css({border: '1px solid #ccc', zIndex: 1001});
        $layout.find('.ta-editor-toolbar').css({borderBottom: '1px solid #ccc'});
        $layout.find('.ta-editor-body').css({height: config.height + 'px'});
        $ele.hide().attr('data-editor-source', 'wangEditor').data('editorLayout', $layout).after($layout);

        const editor = window.wangEditor.createEditor({
            selector: $layout.find('.ta-editor-body').get(0),
            html: $ele.val() || '<p><br></p>',
            config: {
                placeholder: config.placeholder,
                hoverbarKeys: config.hoverbarKeys,
                MENU_CONF: buildMenuConfig(config),
                onCreated(editor) {
                    editor.setHtml($ele.val() || '<p><br></p>');
                },
                onChange(editor) {
                    $ele.val(editor.getHtml()).triggerHandler('editor.change', editor);
                }
            },
            mode: config.mode
        });

        window.wangEditor.createToolbar({
            editor: editor,
            selector: $layout.find('.ta-editor-toolbar').get(0),
            config: {toolbarKeys: config.toolbarKeys, excludeKeys: config.excludeKeys},
            mode: config.mode
        });

        const destroy = editor.destroy.bind(editor);
        editor.getData = function () {
            return editor.getHtml();
        };
        editor.setData = function (html) {
            return editor.setHtml(html || '<p><br></p>');
        };
        editor.updateElement = function () {
            $ele.val(editor.getHtml());
            return editor;
        };
        editor.destroy = function () {
            $ele.removeData('editorInstance').removeData('editorLayout').removeAttr('data-editor-source').show();
            $layout.remove();
            return destroy();
        };

        $ele.data('editorInstance', editor).triggerHandler('editor.init', editor);
        return editor;
    };

    window.createEditor.version = WANG_EDITOR_VERSION;
})();