// ======================= upload-util.js 公共方法 ===========================
// 依赖库：jquery   
// 本代码更新于：2019-5-1 
// 新增更简单的写法 

// 相关配置 
var upload_cfg = {
    upload_image_url: sa.cfg.api_url + '/upload/image',	// 图片上传地址
    upload_video_url: sa.cfg.api_url + '/upload/video',	// 视频上传地址
    upload_audio_url: sa.cfg.api_url + '/upload/audio',	// 音频上传地址
    upload_apk_url: sa.cfg.api_url + '/upload/apk',	// apk安装包上传地址
    upload_file_url: sa.cfg.api_url + '/upload/file',	// file上传地址
}


// 将方法挂载到sa对象上
window.sa = window.sa || {};

// 上传图片   
sa.uploadImage = function (successCB) {
    sa.uploadFn(upload_cfg.upload_image_url, successCB);
}
// 上传视频   
sa.uploadVideo = function (successCB) {
    sa.uploadFn(upload_cfg.upload_video_url, successCB);
}
// 上传音频  
sa.uploadAudio = function (successCB) {
    sa.uploadFn(upload_cfg.upload_audio_url, successCB);
}
// 上传apk 
sa.uploadApk = function (successCB) {
    sa.uploadFn(upload_cfg.upload_apk_url, successCB);
}
// 上传任意文件 
sa.uploadFile = function (successCB) {
    sa.uploadFn(upload_cfg.upload_file_url, successCB);
}
// 上传的内部函数  (要上传到的地址，成功的回调)
sa.uploadFn = function (url, successCB) {
    // 创建input
    var fileInput = document.createElement("input"); //创建input
    fileInput.type = "file"; //设置类型为file
    fileInput.id = 'uploadfile-' + randomString(12);
    fileInput.style.display = 'none';
    fileInput.onchange = function (evt) {
        startUpload(evt.target.files[0], url, successCB);
    }
    // 添加到body，并触发其点击事件
    document.body.appendChild(fileInput);
    document.querySelector('#' + fileInput.id).click();
}

// 上传多张图片   
sa.uploadImageList = function (successCB) {
    sa.uploadListFn(upload_cfg.upload_image_url, successCB);
}
// 上传多个音频   
sa.uploadAudioList = function (successCB) {
    sa.uploadListFn(upload_cfg.upload_audio_url, successCB);
}
// 上传多个视频 
sa.uploadVideoList = function (successCB) {
    sa.uploadListFn(upload_cfg.upload_video_url, successCB);
}
// 上传多个文件 
sa.uploadFileList = function (successCB) {
    sa.uploadListFn(upload_cfg.upload_file_url, successCB);
}

// 上传多个的内部函数  (要上传到的地址，成功的回调)
sa.uploadListFn = function (url, successCB) {
    // 创建input
    var fileInput = document.createElement("input"); //创建input
    fileInput.type = "file"; // 设置类型为file
    fileInput.multiple = "multiple"; // 多选
    fileInput.id = 'uploadfile-' + randomString(12);
    fileInput.style.display = 'none';
    fileInput.onchange = function (evt) {
        // 开始上传
        var files = evt.target.files;
        for (var i = 0; i < files.length; i++) {
            let ii = i;
            startUpload(evt.target.files[ii], url, successCB);
        }
    }
    // 添加到body，并触发其点击事件
    document.body.appendChild(fileInput);
    document.querySelector('#' + fileInput.id).click();
}


// ======================= 以下方法为过时的旧方法 ===========================

// 开始上传，图片版
function startUploadImage(file, successCB) {
    startUpload(file, upload_cfg.upload_image_url, successCB);
}

var startUploadImage2 = startUploadImage;	// 兼容以前的写法

// 开始上传，视频版
function startUploadVideo(file, successCB) {
    startUpload(file, upload_cfg.upload_video_url, successCB);
}

// 开始上传，音频版
function startUploadAudio(file, successCB) {
    startUpload(file, upload_cfg.upload_audio_url, successCB);
}

// 开始上传，apk版
function startUploadApk(file, successCB) {
    startUpload(file, upload_cfg.upload_apk_url, successCB);
}

// 开始上传
function startUpload(file, url, successCB) {

    // 准备参数
    var form = new FormData();
    form.append('file', file);

    // 开始上传
    $.ajax({
        url: url,
        data: form,
        processData: false, // 默认true，设置为 false，不需要进行序列化处理
        cache: false, 		// 设置为false将不会从浏览器缓存中加载请求信息
        contentType: false, // 避免服务器不能正常解析文件
        dataType: 'json',
        type: 'post',
        beforeSend: function (xhr) {
            show_jdt();
        },
        complete: function (xhr) {
            close_jdt();
        },
        xhr: xhrOnProgress(function (e) {
            var percent = e.loaded / e.total; // 计算进度百分比, 取值结果为 0~1 之间的小无限不循环小数
            // progressCB(percent * 100);
            set_jdt_value(percent * 100);
            // console.log('进度百分比' + percent);
        }),
        success: function (res) {
            if (res.code == 200) {
                successCB(res.data);	// 把地址给回调函数
            } else {
                sa.alert(res.msg);
            }
        },
        error: function (e) {
            sa.alert('异常: ' + JSON.stringify(e));
        }
    });

}


// ======================= 工具方法 ===========================


// 返回后缀名
function get_suffix(filename) {
    var pos = filename.lastIndexOf('.');
    if (pos != -1) {
        suffix = filename.substring(pos + 1);
    }
    return suffix;
}

// 返回带有上传回调功能的 xhr 
function xhrOnProgress(fun) {
    xhrOnProgress.onprogress = fun; //绑定监听
    //使用闭包实现监听绑
    return function () {
        //通过$.ajaxSettings.xhr();获得XMLHttpRequest对象
        var xhr = $.ajaxSettings.xhr();
        //判断监听函数是否为函数
        if (typeof xhrOnProgress.onprogress !== 'function')
            return xhr;
        //如果有监听函数并且xhr对象支持绑定时就把监听函数绑定上去
        if (xhrOnProgress.onprogress && xhr.upload) {
            xhr.upload.onprogress = xhrOnProgress.onprogress;
        }
        return xhr;
    }
}

// 
function randomString(len) {
    len = len || 32;
    var $chars = 'ABCDEFGHJKMNPQRSTWXYZabcdefhijkmnprstwxyz2345678';
    /****默认去掉了容易混淆的字符oOLl,9gq,Vv,Uu,I1****/
    var maxPos = $chars.length;
    var str = '';
    for (i = 0; i < len; i++) {
        str += $chars.charAt(Math.floor(Math.random() * maxPos));
    }
    return str;
}


// ======================= 进度条相关 ===========================
// 显示进度条 
function show_jdt() {
    close_jdt();	// 先清除原来的
    // 创建节点并添加到body
    var str = '' +
        '<div class="jdt-fox" style="z-index: 999999999; width: 500px; height: 20px; position: fixed; top: calc(50% - 5px); left: calc(50% - 250px); ">' +
        '	<div class="jdt-fox2" style="width: calc(100% - 100px); height: 6px; margin-top: 7px; border-radius: 3px; float: left; background-color: #FFF; box-shadow: 0 0 10px #aaa;">' +
        '		<div class="jdt-fox-value" style=" transition: all 0.1s; position: relative; width: 0.0%; height: 100%; border-radius: 3px; background-color: green; box-shadow: 0 0 10px green;">' +
        '			<div class="jdt-fox-yh" style="position: absolute; right: -10px; top: -5px;">' +
        '				<div style="transition: all 1s; background-color: green; width: 16px; height: 16px; border-radius: 50%;"></div>' +
        '			</div>' +
        '		</div>' +
        '	</div>' +
        '	<div class="jdt-value-text" style="float: left; font-size: 14px; margin-left: 14px; color: #111;"> 0.0% </div>' +
        '</div>';
    var div = document.createElement("div");
    div.innerHTML = str;
    div.className = "jdt-box";
    document.body.appendChild(div);
    // 开启圆点的呼吸动画效果
    if (window.my_interval_index) {
        clearInterval(window.my_interval_index);
    }
    window.my_interval_index = setInterval(function () {
        if (window.one_num === undefined) {
            window.one_num = 0;
        }
        window.one_num++;
        var n_px = window.one_num % 2 == 0 ? '0px' : '20px';
        var box_shadow = "0 0 " + n_px + " green";
        document.querySelector('.jdt-fox-yh div').style.boxShadow = box_shadow;
    }, 1000);
}

// 关闭进度条 
function close_jdt() {
    // 先关闭动画
    if (window.my_interval_index) {
        clearInterval(window.my_interval_index);
    }
    // 再销毁dom
    var box = document.querySelector('.jdt-box');
    if (box) {
        box.parentNode.removeChild(box);
    }
}

// 设置进度条进度, 参数为一个0~100之间的小数 
function set_jdt_value(value) {
    value = parseInt(value * 10) / 10.0 + '%';	// 保证小数点后一位
    // 改变进度条宽度
    var dft = document.querySelector('.jdt-fox-value');
    if (dft) {
        dft.style.width = value;
    }
    // 改变文字百分比值
    var dvt = document.querySelector('.jdt-value-text');
    if (dvt) {
        dvt.innerHTML = value;
    }
    // console.log(value);
}