import { writeLog } from "./Log.js";
import { PpsParser, SpsParser } from "./Parser.js";

export function resolveUnit(header, body) {
    const t = header & 0x1f;
    switch (t) {
        case 1:
            writeLog("NALU_TYPE_SLICE");
            removeEBSP(body);
            break;
        case 2:
            writeLog("NALU_TYPE_DPA");
            break;
        case 3:
            writeLog("NALU_TYPE_DPB");
            break;
        case 4:
            writeLog("NALU_TYPE_DPC");
            break;
        case 5:
            writeLog("NALU_TYPE_IDR");
            removeEBSP(body);
            break;
        case 6:
            writeLog("NALU_TYPE_SEI");
            break;
        case 7:
            writeLog("NALU_TYPE_SPS");
            removeEBSP(body);
            const sps = SpsParser(body);
            console.log(sps);
            break;
        case 8:
            writeLog("NALU_TYPE_PPS");
            removeEBSP(body);
            PpsParser(body);
            break;
        case 9:
            writeLog("NALU_TYPE_AUD");
            break;
    }
}

function removeEBSP(payload) {
    /**
     * 0x 00 00 03 00
     * 0x 00 00 03 01
     * 0x 00 00 03 02
     * 0x 00 00 03 03
     */
    let index = 2,
        removePosIndexs = [];
    const length = payload.length;
    while (index <= length - 1) {
        if (payload[index] === 3) {
            if (
                payload[index - 2] === 0 &&
                payload[index - 1] === 0 &&
                (payload[index + 1] === 0 || payload[index + 1] === 1 || payload[index + 1] === 2 || payload[index + 1] === 3)
            ) {
            } else {
            }
        }
        index++;
    }

    if (removePosIndexs.length === 0) {
        return payload;
    } else {
        const newPayload = new Uint8Array(length - removePosIndexs.length);
    }
}