var express = require('express');
var mac = require('getmac');//获取mac地址
var fs = require('fs');
var url = require('url');
var router = express.Router();

var ljConst = require("../common/LjConst");
var ljRetState = require("../common/LjRetState");

var logHelper = require("../helper/LjLogHelper.js");
var httpHelper = require("../helper/LjHttpHelper");
var fileHelper = require("../helper/LjFileHelper");
var apiHelper = require("../helper/LjApiHelper");
var ljStringHelper = require("../helper/LjStringHelper");

/**
 * 下载文件
 */
router.get("/downloadFile", function (req, res, next)
{

    var arg = url.parse(req.url, true).query;
    var courseId = arg.courseId;
    var eid = arg.eid;
    var uid = arg.uid;
    var token = arg.token;
    var lessonId = arg.lessonId;
    //获取参数
    logHelper.debug(arg);

    //校验参数
    if (ljStringHelper.isNull(courseId))
    {
        logHelper.info("null object of courseId");

        ljRetState.code = 2;
        ljRetState.msg = "null object of courseId"
        res.json(ljRetState);

        return;
    }
    if (ljStringHelper.isNull(lessonId))
    {
        logHelper.info("null object of lessonId");

        ljRetState.code = 2;
        ljRetState.msg = "null object of lessonId"
        res.json(ljRetState);

        return;
    }
    if (ljStringHelper.isNull(eid))
    {
        logHelper.info("null object of eid");

        ljRetState.code = 2;
        ljRetState.msg = "null object of eid"
        res.json(ljRetState);

        return;
    }
    if (ljStringHelper.isNull(uid))
    {
        logHelper.info("null object of uid");

        ljRetState.code = 2;
        ljRetState.msg = "null object of uid"
        res.json(ljRetState);

        return;
    }
    if (ljStringHelper.isNull(token))
    {
        logHelper.info("null object of token");

        ljRetState.code = 2;
        ljRetState.msg = "null object of token"
        res.json(ljRetState);

        return;
    }

    var opt = {};
    opt.eid = eid;
    opt.uid = uid;
    opt.token = token;
    opt.lessonId = lessonId;
    opt.courseId = courseId;
    opt.path = "/lesson/" + opt.lessonId;
    opt.url = apiHelper.getApiForQueryCourse(opt.lessonId, opt.courseId, opt.eid);
    opt.method = "get";

    httpHelper.request(opt, function (error, res, body)
    {

        let obj = JSON.parse(body);

        var lessonJsonObj = JSON.parse(body);
        if (lessonJsonObj.code == 200)
        {
            /*课件-Begin*/
            //课程集合
            var courseList = lessonJsonObj.data.list;
            //课程数
            var courseListSize = courseList.length;

            //获取总共资源数
            var res_total = 0;
            for (var i = 0; i < courseListSize; i++)
            {
                //资源集合
                var resourceList = courseList[i].list;

                //资源数
                var resourceSize = resourceList.length;
                res_total += resourceSize
            }
            logHelper.info("res_total:"+res_total);
            /*课件-End*/

            //添加下载记录
            opt.resTotal = res_total;
            opt.resSize = 0;
            addDownload(opt);
            logHelper.info("Begin to download file with lessonId【" + opt.lessonId + "】");
            //添加下载记录

            //遍历课件
            for (var i = 0; i < courseListSize; i++)
            {
                //资源集合
                var resourceList = courseList[i].list;

                //资源数
                var resourceSize = resourceList.length;

                for (var j = 0; j < resourceSize; j++)
                {
                    logHelper.debug(resourceList[j].url);
                    var url = resourceList[j].url;

                    fileHelper.downloadFile(url,opt);
                }
            }
            /*课件-End*/

            return "ok";
        }
        else
        {
            logHelper.error("failed to query lesson with lessonId[" + opt.lessonId + "],caused by error:" + lessonJsonObj);
            return "error";
        }
    })

    ljRetState.code = 200;
    ljRetState.msg = "null object of uid"
    ljRetState.success = true;
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.json(ljRetState);

    return;
});

/**
 * 读取文件
 */
router.get("/readFile", function (req, res)
{
    var arg = url.parse(req.url, true).query;
    var fileDirStr = arg.n;
    var fileDirNew = fileDirStr.replace(/\*/g, '\\');

    var fileDir = fileHelper.getFileDir(fileDirNew)
    var fileProp = fileHelper.getFileProperty(fileDir);

    logHelper.info(fileProp.fileType);
    if (fileProp.fileType == ljConst.VIDEO_TYPE_MP4)
    {
        logHelper.info(fileDir);
        fileHelper.readDecryptedStream(res, fileDir, "video/mp4")
    }
    else
    {
        fileHelper.readDecryptedStream(res, fileDir, "image/jpeg")
    }
});

/**
 * 删除下载文件
 */
router.get("/delFile", function (req, res)
{
    var arg = url.parse(req.url, true).query;
    var courseId = arg.courseId;
    var eid = arg.eid;
    var uid = arg.uid;
    var token = arg.token;
    var lessonId = arg.lessonId;
    //获取参数
    logHelper.debug(arg);

    //校验参数
    if (ljStringHelper.isNull(courseId))
    {
        logHelper.info("null object of courseId");

        ljRetState.code = 2;
        ljRetState.msg = "null object of courseId"
        res.json(ljRetState);

        return;
    }
    if (ljStringHelper.isNull(lessonId))
    {
        logHelper.info("null object of lessonId");

        ljRetState.code = 2;
        ljRetState.msg = "null object of lessonId"
        res.json(ljRetState);

        return;
    }
    if (ljStringHelper.isNull(eid))
    {
        logHelper.info("null object of eid");

        ljRetState.code = 2;
        ljRetState.msg = "null object of eid"
        res.json(ljRetState);

        return;
    }
    if (ljStringHelper.isNull(uid))
    {
        logHelper.info("null object of uid");

        ljRetState.code = 2;
        ljRetState.msg = "null object of uid"
        res.json(ljRetState);

        return;
    }
    if (ljStringHelper.isNull(token))
    {
        logHelper.info("null object of token");

        ljRetState.code = 2;
        ljRetState.msg = "null object of token"
        res.json(ljRetState);

        return;
    }

    var opt = {};
    opt.eid = eid;
    opt.uid = uid;
    opt.token = token;
    opt.lessonId = lessonId;
    opt.courseId = courseId;
    opt.path = "/lesson/" + opt.lessonId;
    opt.url = apiHelper.getApiForQueryCourse(opt.lessonId, opt.courseId, opt.eid);
    opt.method = "get";

    httpHelper.request(opt, function (error, res, body)
    {
        let obj = JSON.parse(body);

        var lessonJsonObj = JSON.parse(body);
        if (lessonJsonObj.code == 200)
        {
            /*课件-Begin*/
            //课程集合
            var courseList = lessonJsonObj.data.list;
            //课程数
            var courseListSize = courseList.length;
            //遍历课件
            for (var i = 0; i < courseListSize; i++)
            {
                //资源集合
                var resourceList = courseList[i].list;

                //资源数
                var resourceSize = resourceList.length;

                for (var j = 0; j < resourceSize; j++)
                {
                    logHelper.debug(resourceList[j].url);
                    var url = resourceList[j].url;
                    //fileHelper.downloadFile(url)

                    var delFileProp = fileHelper.getFilePropertyNoMkdir(url);

                    //未加密文件URL
                    var file1 = null;
                    if (delFileProp.fileType == ljConst.VIDEO_TYPE_M3U8)
                    {
                        file1 = delFileProp.folderDir + delFileProp.fileName + "_new.mp4";
                    }
                    else
                    {
                        file1 = delFileProp.folderDir + delFileProp.fileName + "_new." + delFileProp.fileType;
                    }

                    //判断文件是否存在
                    if (fs.existsSync(file1))
                    {
                        //删除路径
                        fs.unlinkSync(file1);
                    }
                }
            }
            /*课件-End*/

            //删除记录
            delDownload(opt);
            return "ok";
        }
        else
        {
            logHelper.error("failed to query lesson with lessonId[" + opt.lessonId + "],caused by error:" + lessonJsonObj);
            return "error";
        }
    });

    ljRetState.code = 2;
    ljRetState.msg = "null object of uid"
    ljRetState.success = true;
    res.setHeader("Access-Control-Allow-Origin", "*");
    res.json(ljRetState);

    return "";
});

var addDownload = function (opt)
{
    var macAddressStr = "";
    mac.getMac(function(err,macAddress){
        if (err)  throw err;
        macAddressStr =  macAddress; //获取mac地址
    });
    console.info("macAddressStr:"+macAddressStr);

    opt.url = apiHelper.getApiForAddDownload(opt.lessonId, opt.courseId, opt.resTotal, opt.resSize);
    opt.method = "post";
    opt.path = "/callback/download/add";

    httpHelper.request(opt, function (error, res, body)
    {
        var retObj = JSON.parse(body);
        logHelper.debug(retObj);

        if (retObj.code == 200)
        {
            logHelper.info("Succeed to call api[" + opt.path + "]");
            return true;
        }
        else
        {
            logHelper.error("Failed to call api[" + opt.path + "],caused by error[" + retObj + "]");
            return false;
        }
    });
}

var delDownload = function (opt)
{
    opt.url = apiHelper.getApiForDelDownload(opt.lessonId, null);
    opt.method = "delete";
    opt.path = "/callback/download/delete";

    httpHelper.request(opt, function (error, res, body)
    {
        var retObj = JSON.parse(body);
        logHelper.debug(retObj);

        if (retObj.code == 200)
        {
            logHelper.info("Succeed to call api[" + opt.path + "]");
            return true;
        }
        else
        {
            logHelper.error("Failed to call api[" + opt.path + "],caused by error[" + retObj + "]");
            return false;
        }
    });
}

module.exports = router;