const express = require("express");
const axios = require("axios");
const router = express.Router();
const URL = require("url");
const {
	bilibili,
	mgtv,
	tencentvideo,
	youku,
	iqiyi
} = require("./api/base");
const list = [bilibili, mgtv, tencentvideo, youku, iqiyi];
const memory = require("../utils/memory");
const db = require("../utils/db");

// 返回对象{msg: "ok", title: "标题", content: []}
async function build_response(url, req) {
	// 循环找最终url
	for (let q = new URLSearchParams(URL.parse(url).query); q.has("url");) {
		console.log("Redirecting to", url);
		url = q.get("url");
		q = new URLSearchParams(URL.parse(url).query);
	}
	console.log("Real url:", url);
	// 测试url是否能下载
	try {
		await axios.get(url, {
			headers: { "Accept-Encoding": "gzip,deflate,compress" }
		});
	} catch (e) {
		console.log(e);
		return { msg: "传入的链接非法！请检查链接是否能在浏览器正常打开" };
	}
	// 循环找到对应的解析器
	let fc = undefined;
	for (let item of list) {
		if (url.indexOf(item.domain) !== -1) {
			fc = item;
		}
	}
	// 找不到对应的解析器
	if (fc === undefined) {
		return { "msg": "不支持的视频网址" };
	}
	// 捕获所有错误并添加日志
	let ret;
	try {
		ret = await fc.work(url);
	} catch (e) {
		console.log(e);
		let err = JSON.stringify(e, Object.getOwnPropertyNames(e));
		db.errorInsert({
			ip: req.ip,
			url,
			err
		});
		return { msg: "弹幕解析过程中程序报错退出，请等待管理员修复！或者换条链接试试！" };
	}
	return ret;
}

async function resolve(req, res) {
	const url = req.query.url;
	const download = (req.query.download === "on");
	const ret = await build_response(url, req);
	memory(); //显示内存使用量
	if (ret.msg !== "ok") {
		res.status(403).send(ret.msg);
		return;
	} else if (download) {
		res.attachment(ret.title + ".xml");
	} else {
		res.type("application/xml");
	}
	// 记录视频信息
	db.videoinfoInsert({url,title:ret.title})
	//B站视频，直接重定向
	if (ret.url)
		res.redirect(ret.url);
	else
		res.render("danmaku-xml", { contents: ret.content });
}

async function index(req, res) {
	const urls = [mgtv.example_urls[0], bilibili.example_urls[0], tencentvideo.example_urls[0], youku.example_urls[0], iqiyi.example_urls[0]];
	const path = req.protocol + "://" + req.headers.host + req.originalUrl;
	const resolve_info = await db.accesscountquery()
	const hotlist = await db.hotlistquery()
	console.log(hotlist)
	res.render("danmaku", {
		path,
		urls,
		resolve_info,
		hotlist
	});
}

/* GET home page. */
router.get("/", async function (req, res) {
	db.accessInsert({
		ip: req.ip,
		url: req.query.url,
		UA: req.headers["user-agent"]
	});
	//检查是否包含URL参数
	if (!req.query.url) index(req, res); else resolve(req, res);
});

module.exports = router;