import Koa from "koa";
import Axios from "axios";
import * as xml2js from "xml2js";

const app = new Koa();

app.use(async (ctx) => {
    try {
        const { data } = await Axios.get(
            "https://podcast.midline.pl/api/v1/channels/Midline/rss"
        );
        const builder = new xml2js.Builder();
        const parsed_data = await xml2js.parseStringPromise(data);
        parsed_data.rss.channel[0]["itunes:author"] =
            "Arkadiusz Wieczorek, Kuba Orlik";
        parsed_data.rss.channel[0]["itunes:owner"][0]["itunes:email"] =
            "kontakt@midline.pl";
        parsed_data.rss.channel[0]["itunes:owner"][0]["itunes:name"] =
            "Arkadiusz Wieczorek, Kuba Orlik";
        parsed_data.rss.channel[0]["link"] = "https://www.internet-czas-dzialac.pl";
        parsed_data.rss.channel[0][
            "itunes:keywords"
        ][0] = parsed_data.rss.channel[0]["itunes:keywords"][0]
            .split(" ")
            .toString();
        parsed_data.rss.channel[0][
            "itunes:summary"
        ][0] = parsed_data.rss.channel[0]["itunes:summary"][0].replace(
            /(<([^>]+)>)/gi,
            ""
        );

        for (
            let i = 0;
            i < parsed_data.rss.channel[0]["atom:link"].length;
            i++
        ) {
            const atomLink = parsed_data.rss.channel[0]["atom:link"][i];

            if (atomLink.$.rel === "self") {
                atomLink.$.href = "https://podcast.midline.pl/feed.xml";
            }
        }

        let last_index = 1;
        for (let i = 0; i < parsed_data.rss.channel[0]["item"].length; i++) {
            const item = parsed_data.rss.channel[0]["item"][i];

            item["guid"][0].$.isPermaLink = item["guid"][0].$.isPermalink;
            delete item["guid"][0].$.isPermalink;
            item["itunes:subtitle"][0] =
                item["itunes:subtitle"][0].slice(0, -2) + "…";
            item["itunes:summary"][0] = item["itunes:summary"][0].replace(
                /(<([^>]+)>)/gi,
                ""
            );
            if (item["title"][0].match(/#[0-9]*/)[0].substring(1) !== "0") {
                try {
                    last_index = item["title"][0]
                        .match(/#[1-9][0-9]*/)[0]
                        .substring(1);
                } catch (e) {
                    last_index = last_index + 1;
                }
                item["itunes:episode"] = [last_index];
            }
        }

        ctx.body = builder.buildObject(parsed_data);
        ctx.type = "application/rss+xml";
    } catch (e) {
        console.error(e);
        ctx.body = "error";
        ctx.status = 500;
    }
});

app.listen(3000);