import readline from "readline";
import dotenv from "dotenv";

dotenv.config();

// ===============================
// CONFIG
// ===============================
const BASE_URL = process.env.BASE_URL;

if (!BASE_URL) {
    console.error("ERRORE: BASE_URL non definita nel .env");
    process.exit(1);
}

const WATCHER_TOKEN = process.env.WATCHER_TOKEN;

if (!WATCHER_TOKEN) {
    console.error("ERRORE: WATCHER_TOKEN non definito nel .env");
    process.exit(1);
}

console.log("Watcher globale avviato");

// ===============================
// STDIN
// ===============================
const rl = readline.createInterface({
    input: process.stdin,
    crlfDelay: Infinity
});

// ===============================
// ESTENSIONI FOTO/VIDEO
// ===============================
const photoExt = [
    ".jpg",
    ".jpeg",
    ".png",
    ".gif",
    ".bmp",
    ".webp",
    ".tiff",
    ".heic",
    ".heif",
    ".mp4",
    ".mov",
    ".avi",
    ".mkv",
    ".webm",
    ".m4v"
];

// ===============================
// ESTENSIONI ATTIVITÀ
// ===============================
const activityExt = [
    ".fit",
    ".gpx",
    ".tcx"
];

// ===============================
// PARSING PATH
// ===============================
function parsePath(fullPath) {

    const match = fullPath.match(
        /^\/app\/(photos|activities)\/([^/]+)\/original(?:\/|$)/
    );

    if (!match) {
        return null;
    }

    return {
        area: match[1],
        user: match[2]
    };
}

// ===============================
// FILTRO FILE
// ===============================
function isAllowedFile(area, filename) {

    const lower = filename.toLowerCase();

    if (area === "photos") {
        return photoExt.some(ext => lower.endsWith(ext));
    }

    if (area === "activities") {
        return activityExt.some(ext => lower.endsWith(ext));
    }

    return false;
}

// ===============================
// CHIAMATA API
// ===============================
async function callAutoScan(type, file, path, user) {

    const relPath = path.replace(/^\/app/, "");

    const headers = {
        "Content-Type": "application/json",
        Authorization: `Bearer ${WATCHER_TOKEN}`
    };

    const payload = {
        type,
        file,
        path: relPath,
        user
    };

    console.log("AUTO_SCAN:", payload);

    const res = await fetch(
        `${BASE_URL}/api_v1/auto_scan`,
        {
            method: "POST",
            headers,
            body: JSON.stringify(payload)
        }
    );

    if (!res.ok) {
        console.error(
            `Errore auto_scan ${res.status}`
        );
    }

    return res.ok;
}

// ===============================
// WATCHER
// ===============================
function startWatcher() {

    rl.on("line", async line => {

        console.log("RAW:", line);

        try {

            const parts = line.trim().split(/\s+/);

            if (parts.length < 3) {
                console.log("EVENTO SCARTATO: formato non valido");
                return;
            }

            const path = parts[0];
            const action = parts[1];
            const file = parts.slice(2).join(" ");

            console.log({
                path,
                action,
                file
            });

            const info = parsePath(path);

            console.log("PARSE_PATH:", info);

            if (!info) {
                console.log("PATH IGNORATO");
                return;
            }

            const { user, area } = info;

            const isDir = action.includes("ISDIR");

            if (!isDir && !isAllowedFile(area, file)) {

                console.log(
                    `FILE IGNORATO area=${area} file=${file}`
                );

                return;
            }

            let type = null;

            if (action === "MOVED_TO,ISDIR") {
                type = "ADD_DIR";
            }
            else if (action === "MOVED_FROM,ISDIR") {
                type = "DEL_DIR";
            }
            else if (/^CLOSE_WRITE(,CLOSE)?$/.test(action)) {
                type = "ADD";
            }
            else if (action === "MOVED_TO") {
                type = "ADD";
            }
            else if (action === "MOVED_FROM") {
                type = "DEL";
            }
            else if (action === "DELETE") {
                type = "DEL";
            }
            else {
                console.log(
                    `AZIONE IGNORATA: ${action}`
                );
                return;
            }

            console.log(
                `[${area}] ${user} -> ${type} ${file}`
            );

            await callAutoScan(
                type,
                file,
                path,
                user
            );

        }
        catch (err) {

            console.error(
                "Errore watcher:",
                err
            );

        }

    });
}

startWatcher();