let PARSEC;

function float_to_int(fval) {
    let ival = fval < 0 ? fval * 32768 : fval * 32767;

    if (ival < -32768) {
        ival = -32768;
    } else if (ival > 32767) {
        ival = 32767;
    }

    return ival;
}

const PARSEC_ENV = {
    // user.bin
    bin_user_bin_get: function (asset_dir_c, session_id_c, size) {
        try {
            const cookies = document.cookie.split(";");

            for (let x = 0; x < cookies.length; x++) {
                const cookie = cookies[x].trim();
                const name = "parsec_login=";

                if (cookie.indexOf(name) == 0) {
                    const auth = JSON.parse(
                        cookie.substring(name.length, cookie.length)
                    );
                    mty_str_to_c(auth["token"], session_id_c, size);

                    return 0;
                }
            }
        } catch (e) {
            console.error(e);
        }

        return -1;
    },
    bin_user_bin_set: function (asset_dir_c, session_id_c) {
        const session_id = mty_str_to_js(session_id_c);

        const value = JSON.stringify({
            token: session_id,
            userId: 0,
        });

        const hostname = window.location.hostname.replace(/.*?\./, "");
        const secure = window.location.protocol == "https:";
        document.cookie =
            "parsec_login=" +
            value +
            ";domain=" +
            hostname +
            ";path=/;" +
            (secure ? "secure" : "") +
            ";max-age=31536000;samesite=strict;";
    },
    bin_user_bin_delete: function (asset_dir_c) {
        const hostname = window.location.hostname.replace(/.*?\./, "");
        document.cookie =
            "parsec_login=;domain=" +
            hostname +
            ";path=/;expires=Thu, 01 Jan 1970 00:00:00 GMT;";
    },

    // Parsec protocol
    web_parsec_protocol: function (peer_id) {
        window.location.assign("parsec://peer_id=" + mty_str_to_js(peer_id));
    },

    // parsec SDK
    parsec_web_init: function () {
        if (PARSEC) return;

        const container = document.createElement("div");
        container.style.zIndex = -1;
        container.style.background = "black";
        container.style.position = "fixed";
        container.style.top = 0;
        container.style.right = 0;
        container.style.bottom = 0;
        container.style.left = 0;
        document.body.appendChild(container);

        const canvas = document.createElement("canvas");
        canvas.style.width = "100%";
        canvas.style.height = "100%";
        container.appendChild(canvas);

        const updateCanvas = (ev) => {
            const rect = canvas.getBoundingClientRect();
            canvas.width = rect.width;
            canvas.height = rect.height;
            window.resizeFlag = true;
        };

        updateCanvas(null);
        window.addEventListener("resize", updateCanvas);

        PARSEC = new Parsec(canvas);
    },
    parsec_web_destroy: function () {
        if (!PARSEC) return;

        PARSEC.destroy();
        PARSEC = undefined;
    },
    parsec_web_disconnect: function (e) {
        PARSEC.clientDisconnect(e);
    },
    parsec_web_get_status: function () {
        return PARSEC.clientGetStatus();
    },
    parsec_web_send_user_data: function (id, msg_c) {
        PARSEC.clientSendUserData(id, mty_str_to_js(msg_c));
    },
    parsec_web_get_guests: function (jstr_c, len) {
        mty_str_to_c(JSON.stringify(PARSEC.clientGetGuests()), jstr_c, len);
    },
    parsec_web_poll_events: function (event_str_c, len) {
        const evt = PARSEC.clientPollEvents();

        if (evt) {
            mty_str_to_c(JSON.stringify(evt), event_str_c, len);
            return true;
        }

        return false;
    },
    parsec_web_get_buffer_size: function (key) {
        return PARSEC.getBufferSize(key);
    },
    parsec_web_get_buffer: function (key, ptr) {
        const buffer = PARSEC.getBuffer(key);

        if (buffer) mty_memcpy(ptr, buffer);
    },
    parsec_web_send_message: function (msg_c) {
        PARSEC.clientSendMessage(JSON.parse(mty_str_to_js(msg_c)));
    },
    parsec_web_get_metrics: function (
        frame_w,
        frame_h,
        color444,
        full_range,
        decode,
        encode,
        network
    ) {
        const metrics = PARSEC.clientGetMetrics();

        mty_set_float(decode, metrics["decodeLatency"]);
        mty_set_float(encode, metrics["encodeLatency"]);
        mty_set_float(network, metrics["networkLatency"]);

        mty_set_uint32(frame_w, metrics["frameWidth"]);
        mty_set_uint32(frame_h, metrics["frameHeight"]);

        mty_set_int8(color444, metrics["444"]);
        mty_set_int8(full_range, metrics["fullRange"]);
    },
    parsec_web_get_network_failure: function () {
        return PARSEC.clientNetworkFailure();
    },
    parsec_web_get_self: function (owner_ptr, id_ptr) {
        const me = PARSEC.clientGetSelf();

        mty_set_int8(owner_ptr, me["owner"]);
        mty_set_uint32(id_ptr, me["id"]);
    },
    parsec_web_get_host_mode: function () {
        return PARSEC.clientGetHostMode();
    },
    parsec_web_new_attempt: async function (
        attempt_id,
        ufrag_c,
        pwd_c,
        fingerprint_c,
        buf_size,
        csync,
        err_c
    ) {
        const creds = await PARSEC.clientNewAttempt(mty_str_to_js(attempt_id));

        if (creds) {
            mty_set_uint32(err_c, 0);
            mty_str_to_c(creds["ice_ufrag"], ufrag_c, buf_size);
            mty_str_to_c(creds["ice_pwd"], pwd_c, buf_size);
            mty_str_to_c(creds["fingerprint"], fingerprint_c, buf_size);
        } else {
            mty_set_uint32(err_c, 1);
        }

        MTY_SignalPtr(csync);
    },
    parsec_web_begin_p2p: function (attempt_id, port, ufrag, pwd, fingerprint) {
        PARSEC.clientBeginP2P(
            mty_str_to_js(attempt_id),
            port,
            mty_str_to_js(ufrag),
            mty_str_to_js(pwd),
            mty_str_to_js(fingerprint)
        );
    },
    parsec_web_add_candidate: function (attempt_id, ip, port, sync, from_stun) {
        PARSEC.clientAddCandidate(
            mty_str_to_js(attempt_id),
            mty_str_to_js(ip),
            port,
            sync,
            from_stun
        );
    },
    parsec_web_poll_audio: function (cbuf, len) {
        const fbuf = PARSEC.clientPollAudio();

        if (fbuf) {
            const buf = new Int16Array(MTY_MEMORY.buffer, cbuf, len);

            for (let x = 0; x < fbuf.length; x++)
                buf[x] = float_to_int(fbuf[x]);

            return fbuf.length / 2;
        }

        return 0;
    },
};