/**
 * BOOT LOADER
 * サーバーからレスポンスされるHTMLに埋め込まれるスクリプトで、以下の役割を持ちます。
 * - 翻訳ファイルをフェッチする。
 * - バージョンに基づいて適切なメインスクリプトを読み込む。
 * - キャッシュされたコンパイル済みテーマを適用する。
 * - クライアントの設定値に基づいて対応するHTMLクラス等を設定する。
 * テーマをこの段階で設定するのは、メインスクリプトが読み込まれる間もテーマを適用したいためです。
 * 注: webpackは介さないため、このファイルではrequireやimportは使えません。
 */

"use strict";

// ブロックの中に入れないと、定義した変数がブラウザのグローバルスコープに登録されてしまい邪魔なので
(async () => {
    window.onerror = (e) => {
        console.error(e);
        renderError("SOMETHING_HAPPENED", e);
    };
    window.onunhandledrejection = (e) => {
        console.error(e);
        renderError("SOMETHING_HAPPENED_IN_PROMISE", e);
    };

    //#region Detect language & fetch translations
    const v = localStorage.getItem("v") || VERSION;

    const supportedLangs = LANGS;
    let lang = localStorage.getItem("lang");
    if (lang == null || !supportedLangs.includes(lang)) {
        if (supportedLangs.includes(navigator.language)) {
            lang = navigator.language;
        } else {
            lang = supportedLangs.find((x) => x.split("-")[0] === navigator.language);

            // Fallback
            if (lang == null) lang = "en-US";
        }
    }

    const res = await fetch(`/assets/locales/${lang}.${v}.json`);
    if (res.status === 200) {
        localStorage.setItem("lang", lang);
        localStorage.setItem("locale", await res.text());
        localStorage.setItem("localeVersion", v);
    } else {
        await checkUpdate();
        renderError("LOCALE_FETCH");
        return;
    }
    //#endregion

    //#region Script
    function importAppScript() {
        import(`/assets/${CLIENT_ENTRY}`).catch(async (e) => {
            await checkUpdate();
            console.error(e);
            renderError("APP_IMPORT", e);
        });
    }

    // タイミングによっては、この時点でDOMの構築が済んでいる場合とそうでない場合とがある
    if (document.readyState !== "loading") {
        importAppScript();
    } else {
        window.addEventListener("DOMContentLoaded", () => {
            importAppScript();
        });
    }
    //#endregion

    //#region Theme
    const theme = localStorage.getItem("theme");
    if (theme) {
        for (const [k, v] of Object.entries(JSON.parse(theme))) {
            document.documentElement.style.setProperty(`--${k}`, v.toString());

            // HTMLの theme-color 適用
            if (k === "htmlThemeColor") {
                for (const tag of document.head.children) {
                    if (
                        tag.tagName === "META" &&
                        tag.getAttribute("name") === "theme-color"
                    ) {
                        tag.setAttribute("content", v);
                        break;
                    }
                }
            }
        }
    }
    const colorSchema = localStorage.getItem("colorSchema");
    if (colorSchema) {
        document.documentElement.style.setProperty("color-schema", colorSchema);
    }
    //#endregion

    let fontSize = localStorage.getItem("fontSize");
    if (fontSize) {
        if (fontSize < 10) {
            // need to do this for now, as values before were 1, 2, 3 depending on the option
            localStorage.setItem("fontSize", null);
            fontSize = localStorage.getItem("fontSize");
        }
        document.documentElement.style.fontSize = `${fontSize}px`;
    }

    if (["ja-JP", "ja-KS", "ko-KR", "zh-CN", "zh-TW"].includes(lang)) {
        document.documentElement.classList.add("useCJKFont");
    }

    const useSystemFont = localStorage.getItem("useSystemFont");
    if (useSystemFont) {
        document.documentElement.classList.add("useSystemFont");
    }

    const wallpaper = localStorage.getItem("wallpaper");
    if (wallpaper) {
        document.documentElement.style.backgroundImage = `url(${wallpaper})`;
    }

    const customCss = localStorage.getItem("customCss");
    if (customCss && customCss.length > 0) {
        const style = document.createElement("style");
        style.innerHTML = customCss;
        document.head.appendChild(style);
    }

    async function addStyle(styleText) {
        const css = document.createElement("style");
        css.appendChild(document.createTextNode(styleText));
        document.head.appendChild(css);
    }

    function renderError(code, details) {
        let errorsElement = document.getElementById("errors");

        if (!errorsElement) {
            document.body.innerHTML = `
			<svg class="icon-warning" xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-alert-triangle" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
				<path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
				<path d="M12 9v2m0 4v.01"></path>
				<path d="M5 19h14a2 2 0 0 0 1.84 -2.75l-7.1 -12.25a2 2 0 0 0 -3.5 0l-7.1 12.25a2 2 0 0 0 1.75 2.75"></path>
			</svg>
			<h1>An error has occurred!</h1>
			<button class="button-big" onclick="location.reload(true);">
				<span class="button-label-big">&#8635; Refresh</span>
			</button>
			<p class="dont-worry">Don't worry, it's (probably) not your fault.</p>
			<p>Please make sure your browser is up-to-date.</p>
			<p>While we don't serve ads, ad-blockers might interfere with this application,<br/> so disabling them might also fix this issue.</p>
			<p>If the problem persists after refreshing, please contact your instance's administrator.<br>You may also try the following options:</p>
			<a href="/flush">
				<button class="button-small">
					<span class="button-label-small">&#128465; Clear preferences and cache</span>
				</button>
			</a>
			<br>
			<a href="/cli">
				<button class="button-small">
					<span class="button-label-small">&#128491; Start the simple client</span>
				</button>
			</a>
			<br>
			<a href="/bios">
				<button class="button-small">
					<span class="button-label-small">&#9881; Start the repair tool</span>
				</button>
			</a>
			<br>
			<div id="errors"></div>
			`;
            errorsElement = document.getElementById("errors");
        }
        const detailsElement = document.createElement("details");
        detailsElement.innerHTML = `
		<br>
		<summary>
			<code>ERROR CODE: ${code}</code>
		</summary>
		<code>${JSON.stringify(details)}</code>`;
        errorsElement.appendChild(detailsElement);
        addStyle(`
		* {
			font-family: Roboto,HelveticaNeue,Arial,sans-serif;
		}

		#iceshrimp_app,
		#splash {
			display: none !important;
		}

		body,
		html {
			background-color: #3b364c;
			color: rgb(231, 237, 255);
			justify-content: center;
			margin: auto;
			padding: 10px;
			text-align: center;
		}

		button {
			border-radius: 999px;
			padding: 0px 12px 0px 12px;
			border: none;
			cursor: pointer;
			margin-bottom: 12px;
		}

		.button-big {
			background: linear-gradient(-45deg, rgb(154, 146, 255), rgb(131, 114, 245));
			line-height: 50px;
		}

		.button-big:hover {
			background: rgb(201, 197, 255);
		}

		.button-small {
			background: #544d77;
			line-height: 40px;
		}

		.button-small:hover {
			background: #504967;
		}

		.button-label-big {
			color: #3b364c;
			font-weight: bold;
			font-size: 2em;
			padding: 12px;
		}

		.button-label-small {
			color: rgb(231, 237, 255);
			font-size: 16px;
			padding: 12px;
		}

		a {
			color: rgb(255, 123, 114);
			text-decoration: none;
		}

		p,
		li {
			font-size: 16px;
		}

		.dont-worry,
		#msg {
			font-size: 18px;
		}

		.icon-warning {
			color: rgb(236, 182, 55);
			height: 4rem;
			padding-top: 2rem;
		}

		h1 {
			font-size: 32px;
		}

		code {
			font-family: Fira, FiraCode, monospace;
		}

		details {
			background: #423c55;
			margin-bottom: 2rem;
			padding: 0.5rem 1rem;
			width: 40rem;
			border-radius: 10px;
			justify-content: center;
			margin: auto;
		}

		summary {
			cursor: pointer;
		}

		summary > * {
			display: inline;
		}

		@media screen and (max-width: 500px) {
			details {
				width: 50%;
			}
		`);
    }

    async function checkUpdate() {
        try {
            const res = await fetch("/api/meta", {
                method: "POST",
                cache: "no-cache",
            });

            const meta = await res.json();

            if (meta.version != v) {
                localStorage.setItem("v", meta.version);
                refresh();
            }
        } catch (e) {
            console.error(e);
            renderError("UPDATE_CHECK", e);
            throw e;
        }
    }

    function refresh() {
        // Clear cache (service worker)
        try {
            navigator.serviceWorker.controller.postMessage("clear");
            navigator.serviceWorker.getRegistrations().then((registrations) => {
                registrations.forEach((registration) => registration.unregister());
            });
        } catch (e) {
            console.error(e);
        }

        location.reload();
    }
})();