class HiAnime {
    constructor() {
        this.type = "anime-board";
        this.version = "1.1"
        this.baseUrl = "https://hianime.to";
    }

    getSettings() {
        return {
            episodeServers: ["HD-1", "HD-2", "HD-3", "HD-4"],
            supportsDub: true
        };
    }

    async search(query) {
        const normalize = (str) => this.safeString(str).toLowerCase().replace(/[^a-z0-9]+/g, "");

        const start = query.media.startDate;
        const fetchMatches = async (url) => {
            const html = await fetch(url).then(res => res.text());

            const regex = /<a href="\/watch\/([^"]+)"[^>]+title="([^"]+)"[^>]+data-id="(\d+)"/g;

            return [...html.matchAll(regex)].map(m => {
                const id = m[3];
                const pageUrl = m[1];
                const title = m[2];

                const jnameRegex = new RegExp(
                    `<h3 class="film-name">[\\s\\S]*?<a[^>]+href="\\/${pageUrl}[^"]*"[^>]+data-jname="([^"]+)"`,
                    "i"
                );
                const jnameMatch = html.match(jnameRegex);
                const jname = jnameMatch ? jnameMatch[1] : null;

                const imageRegex = new RegExp(
                    `<a href="/watch/${pageUrl.replace(/\//g, "\\/")}"[\\s\\S]*?<img[^>]+data-src="([^"]+)"`,
                    "i"
                );
                const imageMatch = html.match(imageRegex);
                const image = imageMatch ? imageMatch[1] : null;

                return {
                    id,
                    pageUrl,
                    title,
                    image,
                    normTitleJP: normalize(this.normalizeSeasonParts(jname)),
                    normTitle: normalize(this.normalizeSeasonParts(title)),
                };
            });
        };

        let url = `${this.baseUrl}/search?keyword=${encodeURIComponent(query.query)}&sy=${start.year}&sm=${start.month}&sort=default`;
        let matches = await fetchMatches(url);

        if (matches.length === 0) return [];

        return matches.map(m => ({
            id: `${m.id}/${query.dub ? "dub" : "sub"}`,
            title: m.title,
            image: m.image,
            url: `${this.baseUrl}/${m.pageUrl}`,
            subOrDub: query.dub ? "dub" : "sub"
        }));
    }

    async findEpisodes(animeId) {
        const [id, subOrDub] = animeId.split("/");
        const res = await fetch(`${this.baseUrl}/ajax/v2/episode/list/${id}`, {
            headers: { "X-Requested-With": "XMLHttpRequest" }
        });
        const json = await res.json();
        const html = json.html;
        console.log(html)


        const episodes = [];
        const regex = /<a[^>]*class="[^"]*\bep-item\b[^"]*"[^>]*data-number="(\d+)"[^>]*data-id="(\d+)"[^>]*href="([^"]+)"[\s\S]*?<div class="ep-name[^"]*"[^>]*title="([^"]+)"/g;

        let match;
        while ((match = regex.exec(html)) !== null) {
            episodes.push({
                id: `${match[2]}/${subOrDub}`,
                number: parseInt(match[1], 10),
                url: this.baseUrl + match[3],
                title: match[4],
            });
        }

        return episodes;
    }

    async findEpisodeServer(episode, _server, category = "sub") {
        const id = episode.id;
        const subOrDub = category; // backend manda sub | dub

        const serverName = _server !== "default" ? _server : "HD-1";

        if (serverName === "HD-1" || serverName === "HD-2" || serverName === "HD-3") {
            const serverJson = await fetch(
                `${this.baseUrl}/ajax/v2/episode/servers?episodeId=${id}`,
                { headers: { "X-Requested-With": "XMLHttpRequest" } }
            ).then(res => res.json());

            const serverHtml = serverJson.html;

            const regex = new RegExp(
                `<div[^>]*class="item server-item"[^>]*data-type="${subOrDub}"[^>]*data-id="(\\d+)"[^>]*>\\s*<a[^>]*>\\s*${serverName}\\s*</a>`,
                "i"
            );

            const match = regex.exec(serverHtml);
            if (!match)
                throw new Error(`Server "${serverName}" (${subOrDub}) not found`);

            const serverId = match[1];

            const sourcesJson = await fetch(
                `${this.baseUrl}/ajax/v2/episode/sources?id=${serverId}`,
                { headers: { "X-Requested-With": "XMLHttpRequest" } }
            ).then(res => res.json());

            let decryptData;
            let requiredHeaders = {};

            try {
                decryptData = await this.extractMegaCloud(sourcesJson.link, true);
                if (decryptData?.headersProvided) {
                    requiredHeaders = decryptData.headersProvided;
                }
            } catch (e) {
                console.warn("Primary decrypter failed:", e);
            }

            if (!decryptData) {
                const fallbackRes = await fetch(
                    `https://ac-api.ofchaos.com/api/anime/embed/convert/v2?embedUrl=${encodeURIComponent(sourcesJson.link)}`
                );
                decryptData = await fallbackRes.json();

                requiredHeaders = {
                    Referer: "https://megacloud.club/",
                    Origin: "https://megacloud.club",
                    "User-Agent":
                        "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36",
                    "X-Requested-With": "XMLHttpRequest",
                };
            }

            const streamSource =
                decryptData.sources.find(s => s.type === "hls") ||
                decryptData.sources.find(s => s.type === "mp4");

            if (!streamSource?.file)
                throw new Error("No valid stream file found");

            const subtitles = (decryptData.tracks || [])
                .filter(t => t.kind === "captions")
                .map((track, i) => ({
                    id: `sub-${i}`,
                    language: track.label || "Unknown",
                    url: track.file,
                    isDefault: !!track.default,
                }));

            return {
                server: serverName,
                headers: requiredHeaders,
                videoSources: [
                    {
                        url: streamSource.file,
                        type: streamSource.type === "hls" ? "m3u8" : "mp4",
                        quality: "auto",
                        subtitles,
                        subOrDub: category,
                    },
                ],
            };
        }

        if (serverName === "HD-4") {
            throw new Error("HD-4 not implemented");
        }

        throw new Error(`Unknown server ${serverName}`);
    }

    safeString(str) {
        return (typeof str === "string" ? str : "");
    }

    normalizeSeasonParts(title) {
        const s = this.safeString(title);
        return s.toLowerCase()
            .replace(/[^a-z0-9]+/g, "")
            .replace(/\d+(st|nd|rd|th)/g, (m) => m.replace(/st|nd|rd|th/, ""))
            .replace(/season|cour|part/g, "");
    }

    async extractMegaCloud(embedUrl, returnHeaders = false) {
        const url = new URL(embedUrl);
        const baseDomain = `${url.protocol}//${url.host}/`;

        const headers = {
            "Accept": "*/*",
            "X-Requested-With": "XMLHttpRequest",
            "Referer": baseDomain,
            "Origin": `${url.protocol}//${url.host}`,
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/139.0.0.0 Safari/537.36",
        };

        const html = await fetch(embedUrl, { headers }).then((r) => r.text());
        const fileIdMatch = html.match(/<title>\s*File\s+#([a-zA-Z0-9]+)\s*-/i);
        if (!fileIdMatch) throw new Error("file_id not found in embed page");
        const fileId = fileIdMatch[1];

        let nonce = null;
        const match48 = html.match(/\b[a-zA-Z0-9]{48}\b/);
        if (match48) nonce = match48[0];
        else {
            const match3x16 = [...html.matchAll(/["']([A-Za-z0-9]{16})["']/g)];
            if (match3x16.length >= 3) {
                nonce = match3x16[0][1] + match3x16[1][1] + match3x16[2][1];
            }
        }
        if (!nonce) throw new Error("nonce not found");

        const sourcesJson = await fetch(
            `${baseDomain}embed-2/v3/e-1/getSources?id=${fileId}&_k=${nonce}`,
            { headers }
        ).then((r) => r.json());

        return {
            sources: sourcesJson.sources,
            tracks: sourcesJson.tracks || [],
            intro: sourcesJson.intro || null,
            outro: sourcesJson.outro || null,
            server: sourcesJson.server || null,
            headersProvided: returnHeaders ? headers : undefined
        };
    }
}

module.exports = HiAnime;