import "./meta";

import FileSaver from "file-saver";
import { waitForSheetLoaded } from "./utils";
import { downloadPDF } from "./pdf";
import { getFileUrl } from "./file";
import { BtnList, BtnAction, BtnListMode } from "./btn";
import { ScoreInfoInPage, SheetInfoInPage } from "./scoreinfo";
import i18nextInit, { i18next } from "./i18n/index";
import { isGmAvailable, _GM } from "./gm";

(async () => {
    await i18nextInit;
})();

if (isGmAvailable("registerMenuCommand")) {
    // add buttons to the userscript manager menu
    _GM.registerMenuCommand(
        "** " +
            i18next.t("version", { version: _GM.info.script.version }) +
            " **",
        () =>
            _GM.openInTab(
                "https://github.com/LibreScore/dl-librescore/releases",
                {
                    active: true,
                }
            )
    );

    _GM.registerMenuCommand("** " + i18next.t("source_code") + " **", () =>
        _GM.openInTab(_GM.info.script.homepage, { active: true })
    );

    _GM.registerMenuCommand("** Discord **", () =>
        _GM.openInTab("https://discord.gg/DKu7cUZ4XQ", { active: true })
    );
}

const { saveAs } = FileSaver;

const main = (): void => {
    let isOfficial = false;
    new Promise(() => {
        const observer = new MutationObserver(() => {
            let noSub = Array.from(
                document.querySelectorAll("#jmuse-scroller-component div")
            ).some((img: HTMLDivElement) =>
                img.innerText.startsWith("End of preview")
            );
            if (!noSub) {
                noSub = document.querySelector("#jmuse-scroller-component")
                    ? false
                    : true;
            }
            noSub = false;
            const scoreinfo = new ScoreInfoInPage(document);
            const btnList = new BtnList();
            let indvPartBtn: HTMLButtonElement | null = null;
            const fallback = () => {
                // btns fallback to load from MSCZ file (`Individual Parts`)
                return indvPartBtn?.click();
            };

            if (
                noSub &&
                (document.querySelector(
                    "meta[property='musescore:author'][content='Official Scores']"
                ) ||
                    document.querySelector(
                        "meta[property='musescore:author'][content='Official Author']"
                    ))
            ) {
                const btnOffList = new BtnList();
                if (!isOfficial) {
                    btnOffList.add({
                        name:
                            i18next.t("download", { fileType: "PDF" }) +
                            "\n(" +
                            i18next.t("official_button") +
                            ")",
                        action: BtnAction.openUrl(
                            "https://musescore.com/upgrade"
                        ),
                        tooltip: i18next.t("official_tooltip"),
                    });
                    // eslint-disable-next-line @typescript-eslint/no-floating-promises
                    btnOffList.commit(BtnListMode.InPage, 2);
                }
            } else {
                observer.disconnect();
                if (isOfficial) {
                    document
                        .querySelector(".js-page")!
                        .shadowRoot!.querySelectorAll("#\\31, #\\32")
                        .forEach((e) => e.remove());
                    isOfficial = false;
                }
                btnList.add({
                    name: i18next.t("download", {
                        fileType: "PDF",
                    }),
                    action: BtnAction.process(
                        () =>
                            downloadPDF(
                                scoreinfo,
                                new SheetInfoInPage(document),
                                saveAs
                            ),
                        fallback,
                        3 * 60 * 1000 /* 3min */
                    ),
                });
            }

            if (!isOfficial) {
                isOfficial = true;
                btnList.add({
                    name: i18next.t("download", { fileType: "MIDI" }),
                    action: BtnAction.download(
                        () => getFileUrl(scoreinfo.id, "midi"),
                        fallback,
                        30 * 1000 /* 30s */
                    ),
                });

                btnList.add({
                    name: i18next.t("download", { fileType: "MP3" }),
                    action: BtnAction.download(
                        () => getFileUrl(scoreinfo.id, "mp3"),
                        fallback,
                        30 * 1000 /* 30s */
                    ),
                });
                // eslint-disable-next-line @typescript-eslint/no-floating-promises
                btnList.commit(BtnListMode.InPage, 1);
            }
        });
        observer.observe(
            document.querySelector("#jmuse-scroller-component") ?? document,
            {
                childList: true,
                subtree: true,
            }
        );
    });
};

// eslint-disable-next-line @typescript-eslint/no-floating-promises
waitForSheetLoaded().then(main);