var CosAuth = require('./lib/cos-auth');
var config = require('./config');

var uploadFile = function () {
    // 请求用到的参数
    // var prefix = 'https://cos.' + config.Region + '.myqcloud.com/' + config.Bucket + '/'; // 这个是后缀式，签名也要指定 Pathname: '/' + config.Bucket + '/'
    var prefix = 'https://' + config.Bucket + '.cos.' + config.Region + '.myqcloud.com/';

    // 对更多字符编码的 url encode 格式
    var camSafeUrlEncode = function (str) {
        return encodeURIComponent(str)
            .replace(/!/g, '%21')
            .replace(/'/g, '%27')
            .replace(/\(/g, '%28')
            .replace(/\)/g, '%29')
            .replace(/\*/g, '%2A');
    };

    // 获取临时密钥
    var stsCache;
    var getCredentials = function (callback) {
        if (stsCache && Date.now() / 1000 + 30 < stsCache.expiredTime) {
            callback(stsCache.credentials);
            return;
        }
        wx.request({
            method: 'GET',
            url: config.stsUrl, // 服务端签名，参考 server 目录下的两个签名例子
            dataType: 'json',
            success: function (result) {
                var data = result.data;
                var credentials = data.credentials;
                if (credentials) {
                    stsCache = data
                } else {
                    wx.showModal({title: '临时密钥获取失败', content: JSON.stringify(data), showCancel: false});
                }
                callback(stsCache && stsCache.credentials);
            },
            error: function (err) {
                wx.showModal({title: '临时密钥获取失败', content: JSON.stringify(err), showCancel: false});
            }
        });
    };

    // 计算签名
    var getAuthorization = function (options, callback) {
        getCredentials(function (credentials) {
            callback({
                XCosSecurityToken: credentials.sessionToken,
                Authorization: CosAuth({
                    SecretId: credentials.tmpSecretId,
                    SecretKey: credentials.tmpSecretKey,
                    Method: options.Method,
                    Pathname: options.Pathname,
                })
            });
        });
    };

    // 上传文件
    var uploadFile = function (filePath) {
        var Key = filePath.substr(filePath.lastIndexOf('/') + 1); // 这里指定上传的文件名
        getAuthorization({Method: 'POST', Pathname: '/'}, function (AuthData) {
            var requestTask = wx.uploadFile({
                url: prefix,
                name: 'file',
                filePath: filePath,
                formData: {
                    'key': Key,
                    'success_action_status': 200,
                    'Signature': AuthData.Authorization,
                    'x-cos-security-token': AuthData.XCosSecurityToken,
                    'Content-Type': '',
                },
                success: function (res) {
                    var url = prefix + camSafeUrlEncode(Key).replace(/%2F/g, '/');
                    if (res.statusCode === 200) {
                        wx.showModal({title: '上传成功', content: url, showCancel: false});
                    } else {
                        wx.showModal({title: '上传失败', content: JSON.stringify(res), showCancel: false});
                    }
                    console.log(res.statusCode);
                    console.log(url);
                },
                fail: function (res) {
                    wx.showModal({title: '上传失败', content: JSON.stringify(res), showCancel: false});
                }
            });
            requestTask.onProgressUpdate(function (res) {
                console.log('正在进度:', res);
            });
        });
    };

    // 选择文件
    wx.chooseImage({
        count: 1, // 默认9
        sizeType: ['original'], // 可以指定是原图还是压缩图，这里默认用原图
        sourceType: ['album', 'camera'], // 可以指定来源是相册还是相机，默认二者都有
        success: function (res) {
            uploadFile(res.tempFiles[0].path);
        }
    })
};

module.exports = uploadFile;