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 normalized = fullPath.replace(/\\/g, "/");

    /*
     * Supporta sia:
     *
     * /app/photos/Fabio/original/...
     * /app/activities/Fabio/original/...
     *
     * sia:
     *
     * ../public/photos/Fabio/original/...
     * ../public/activities/Fabio/original/...
     *
     */

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

    if (!match) {
        return null;
    }

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

// ===============================
// NORMALIZZAZIONE PATH
// ===============================

function normalizePath(fullPath) {

    const normalized = fullPath.replace(/\\/g, "/");

    /*
     * Trasforma:
     *
     * ../public/photos/Fabio/original/traptour/
     *
     * in:
     *
     * /photos/Fabio/original/traptour/
     *
     *
     * e anche:
     *
     * /app/photos/Fabio/original/traptour/
     *
     * in:
     *
     * /photos/Fabio/original/traptour/
     */

    const match = normalized.match(
        /(?:^|\/)(photos|activities)\/(.+)$/
    );

    if (!match) {
        return null;
    }

    return `/${match[1]}/${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 = normalizePath(path);

    if (!relPath) {
        console.error(
            "Impossibile normalizzare path:",
            path
        );

        return false;
    }

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

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

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

    try {

        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}`
            );

            try {
                const text = await res.text();

                if (text) {
                    console.error(
                        "Risposta API:",
                        text
                    );
                }
            }
            catch (_) {
                // niente
            }

            return false;
        }

        console.log(
            `AUTO_SCAN OK ${res.status}`
        );

        return true;

    }
    catch (err) {

        console.error(
            "Errore chiamata auto_scan:",
            err
        );

        return false;
    }
}

// ===============================
// 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
            });

            // ===============================
            // PARSE PATH
            // ===============================

            const info = parsePath(path);

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

            if (!info) {

                console.log(
                    "PATH IGNORATO"
                );

                return;
            }

            const {
                user,
                area
            } = info;

            // ===============================
            // DIRECTORY?
            // ===============================

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

            // ===============================
            // FILTRO ESTENSIONE
            // ===============================

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

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

                return;
            }

            // ===============================
            // TIPO EVENTO
            // ===============================

            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;
            }

            // ===============================
            // EVENTO
            // ===============================

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

            // ===============================
            // API
            // ===============================

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

        }
        catch (err) {

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

// ===============================
// START
// ===============================

startWatcher();