/*!
 * Image (upload) dialog plugin for Editor.md
 *
 * @file        image-dialog.js
 * @author      pandao
 * @version     1.3.4
 * @updateTime  2015-06-09
 * {@link       https://github.com/pandao/editor.md}
 * @license     MIT
 */

(function() {

    var factory = function (exports) {

		var pluginName   = "image-dialog";

		exports.fn.imageDialog = function() {

            var _this       = this;
            var cm          = this.cm;
            var lang        = this.lang;
            var editor      = this.editor;
            var settings    = this.settings;
            var cursor      = cm.getCursor();
            var selection   = cm.getSelection();
            var imageLang   = lang.dialog.image;
            var classPrefix = this.classPrefix;
            var iframeName  = classPrefix + "image-iframe";
			var dialogName  = classPrefix + pluginName, dialog;

			cm.focus();

            var loading = function(show) {
                var _loading = dialog.find("." + classPrefix + "dialog-mask");
                _loading[(show) ? "show" : "hide"]();
            };

            if (editor.find("." + dialogName).length < 1)
            {
                var guid   = (new Date).getTime();
                var action = settings.imageUploadURL + (settings.imageUploadURL.indexOf("?") >= 0 ? "&" : "?") + "guid=" + guid;

                if (settings.crossDomainUpload)
                {
                    action += "&callback=" + settings.uploadCallbackURL + "&dialog_id=editormd-image-dialog-" + guid;
                }

                var imageFileName = classPrefix + "image-file";
                // 将 action 置为 # 号。后面使用 ajax 重写图片上传请求
                var dialogContent = ( (settings.imageUpload) ? "<form action=\"#\" target=\"" + iframeName + "\" method=\"post\" enctype=\"multipart/form-data\" class=\"" + classPrefix + "form\">" : "<div class=\"" + classPrefix + "form\">" ) +
                                        ( (settings.imageUpload) ? "<iframe name=\"" + iframeName + "\" id=\"" + iframeName + "\" guid=\"" + guid + "\"></iframe>" : "" ) +
                                        // [begin] add by Frankie. for change imageUploadURL
                                        ( (settings.imageUpload) ? "<label>Service</label><input type=\"text\" id=\"upload-url-input\" title=\"" + settings.imageUploadURL + "\" placeholder=\"" + settings.imageUploadURL + "\" disabled />" : "" ) +
                                        (function() {
                                            return (settings.imageUpload) ? "<div style=\"margin-left: 8px; display: inline-block\">" +
                                                                                "<button type=\"button\" id=\"lock-or-unlock\">Unlock</button>" +
                                                                            "</div><br/>" : "";
                                        })() +
                                        // [end] add by Frankie.
                                        "<label>" + imageLang.url + "</label>" +
                                        "<input type=\"text\" data-url />" + (function(){
                                            return (settings.imageUpload) ? "<div class=\"" + classPrefix + "file-input\">" +
                                                                                // 这里增加 id = {imageFileName}，方便后面拿到文件数据
                                                                                "<input type=\"file\" name=\"" + imageFileName + "\" id=\"" + imageFileName + "\" accept=\"image/*\" />" +
                                                                                "<input type=\"submit\" value=\"" + imageLang.uploadButton + "\" />" +
                                                                            "</div>" : "";
                                        })() +
                                        "<br/>" +
                                        "<label>" + imageLang.alt + "</label>" +
                                        "<input type=\"text\" value=\"" + selection + "\" data-alt />" +
                                        "<br/>" +
                                        "<label>" + imageLang.link + "</label>" +
                                        "<input type=\"text\" value=\"http://\" data-link />" +
                                        "<br/>" +
                                    ( (settings.imageUpload) ? "</form>" : "</div>");

                //var imageFooterHTML = "<button class=\"" + classPrefix + "btn " + classPrefix + "image-manager-btn\" style=\"float:left;\">" + imageLang.managerButton + "</button>";

                dialog = this.createDialog({
                    title      : imageLang.title,
                    width      : (settings.imageUpload) ? 465 : 380,
                    height     : (settings.imageUpload) ? 304 : 254,
                    name       : dialogName,
                    content    : dialogContent,
                    mask       : settings.dialogShowMask,
                    drag       : settings.dialogDraggable,
                    lockScreen : settings.dialogLockScreen,
                    maskStyle  : {
                        opacity         : settings.dialogMaskOpacity,
                        backgroundColor : settings.dialogMaskBgColor
                    },
                    buttons : {
                        enter : [lang.buttons.enter, function() {
                            var url  = this.find("[data-url]").val();
                            var alt  = this.find("[data-alt]").val();
                            var link = this.find("[data-link]").val();

                            if (url === "")
                            {
                                alert(imageLang.imageURLEmpty);
                                return false;
                            }

							var altAttr = (alt !== "") ? " \"" + alt + "\"" : "";

                            if (link === "" || link === "http://")
                            {
                                cm.replaceSelection("![" + alt + "](" + url + altAttr + ")");
                            }
                            else
                            {
                                cm.replaceSelection("[![" + alt + "](" + url + altAttr + ")](" + link + altAttr + ")");
                            }

                            if (alt === "") {
                                cm.setCursor(cursor.line, cursor.ch + 2);
                            }

                            this.hide().lockScreen(false).hideMask();

                            //删除对话框
                            this.remove();

                            return false;
                        }],

                        cancel : [lang.buttons.cancel, function() {
                            this.hide().lockScreen(false).hideMask();

                            //删除对话框
                            this.remove();
                            
                            return false;
                        }]
                    }
                });

                dialog.attr("id", classPrefix + "image-dialog-" + guid);

				if (!settings.imageUpload) {
                    return ;
                }

                // 给按钮绑定事件，支持手动更新 settings.imageUploadURL
                $('#lock-or-unlock').on('click', function() {
                    let uploadURLInput = $('#upload-url-input')
                    if (uploadURLInput.attr('disabled') == undefined) {
                        // 如果输入框未被禁用，则禁用按钮
                        $(this).text('Unlock');
                        uploadURLInput.attr('disabled', 'disabled');
                        // 用输入框内容更新 imageUploadURL
                        if (uploadURLInput.val().trim().length > 0) {
                            settings.imageUploadURL = uploadURLInput.val().trim()
                            // 触发回调事件，支持向上暴露
                            settings.imageUploadURLChange(settings.imageUploadURL)
                        }
                    } else {
                        // 如果输入框为禁用状态，则解锁输入框
                        $(this).text('Update');
                        uploadURLInput.removeAttr('disabled');
                        uploadURLInput.trigger('focus')
                    }
                })

				var fileInput  = dialog.find("[name=\"" + imageFileName + "\"]");

				fileInput.bind("change", function() {
					var fileName  = fileInput.val();
					var isImage   = new RegExp("(\\.(" + settings.imageFormats.join("|") + "))$", "i"); // /(\.(webp|jpg|jpeg|gif|bmp|png))$/

					if (fileName === "")
					{
						alert(imageLang.uploadFileEmpty);

                        return false;
					}

                    if (!isImage.test(fileName))
					{
						alert(imageLang.formatNotAllowed + settings.imageFormats.join(", "));

                        return false;
					}

                    loading(true);

                    var submitHandler = function() {

                        var uploadIframe = document.getElementById(iframeName);

                        uploadIframe.onload = function() {

                            loading(false);

                            // 注释掉官方写法，这里存在 iframe 跨域问题
                            // var body = (uploadIframe.contentWindow ? uploadIframe.contentWindow : uploadIframe.contentDocument).document.body;
                            // var json = (body.innerText) ? body.innerText : ( (body.textContent) ? body.textContent : null);

                            // json = (typeof JSON.parse !== "undefined") ? JSON.parse(json) : eval("(" + json + ")");

                            // if(!settings.crossDomainUpload)
                            // {
                            //   if (json.success === 1)
                            //   {
                            //       dialog.find("[data-url]").val(json.url);
                            //   }
                            //   else
                            //   {
                            //       alert(json.message);
                            //   }
                            // }

                            // 重写图片上传方法
                            var formData = new FormData();
                            formData.append(imageFileName, $("#" + imageFileName)[0].files[0]);
                            var action = settings.imageUploadURL + (settings.imageUploadURL.indexOf("?") >= 0 ? "&" : "?") + "guid=" + guid;
                            $.ajax({
                                url: action,
                                type: "POST",
                                data: formData,
                                dataType: "json",
                                async: false,
                                processData: false, // 使数据不做处理
                                contentType: false, // 不要设置 Content-Type 请求头
                                success: function (data) {
                                    // 成功拿到结果放到这个函数 data就是拿到的结果
                                    if (data.success === 1) {
                                        dialog.find("[data-url]").val(data.url);
                                    } else {
                                        alert(data.message);
                                    }
                                },
                                error: function(xhr) {
                                    alert("Upload image failed. HTTP Status Code: " + xhr.status);
                                },
                            });
                            return false;
                        };
                    };

                    dialog.find("[type=\"submit\"]").bind("click", submitHandler).trigger("click");
				});
            }

			dialog = editor.find("." + dialogName);
			dialog.find("[type=\"text\"]").val("");
			dialog.find("[type=\"file\"]").val("");
			dialog.find("[data-link]").val("http://");

			this.dialogShowMask(dialog);
			this.dialogLockScreen();
			dialog.show();

		};

	};

	// CommonJS/Node.js
	if (typeof require === "function" && typeof exports === "object" && typeof module === "object")
    {
        module.exports = factory;
    }
	else if (typeof define === "function")  // AMD/CMD/Sea.js
    {
		if (define.amd) { // for Require.js

			define(["editormd"], function(editormd) {
                factory(editormd);
            });

		} else { // for Sea.js
			define(function(require) {
                var editormd = require("./../../editormd");
                factory(editormd);
            });
		}
	}
	else
	{
        factory(window.editormd);
	}

})();