class gbxReplay {

    CHUNKS_OFFSET = 17;
    HEADER_OFFSET = 21;
    UNASSIGNED = 0xFFFFFFFF;

    calcChunkOffset(num) {
        return (((num) * 8) + this.HEADER_OFFSET)
    }

    isNumber(id) { return (((id) & 0xC0000000) == 0)}
    isString(id) { return (((id) & 0xC0000000) != 0)}
    isUnassigned(id) {return ((id) == this.UNASSIGNED)}
    getIndex(id) {return ((id) & 0x3FFFFFFF)}

    readIdentifier(buff, idList, outString, stringLen)
    {
        if ( idList.version < 3 ) {
            idList.version = buff.readUInt32();
        }

        let id = buff.readUInt32();
        if(this.isUnassigned(id)) {
            return;
        }

        if(this.isNumber(id)){
            console.log("number")
        }

        if(idList.version == 2) {
            outString = buff.readString(stringLen)
            console.log(outString)
        }

        if(this.isString(id) && this.getIndex(id) == 0) {
            outString = buff.readString(stringLen)
            
            console.log(outString)
        }
    }

    parseReplayChunk(buff, chunkInfo) {
        buff.seek(0+chunkInfo.dwOffset);
        let version = buff.readUInt32();
        let isVSK = version >= 9999 ? true : false;

        let idList = { version: 0, index: 0, list:[[]]}

        if( chunkInfo.dwSize <= 4) {
            return;
        }

        if((!isVSK && version >= 3) || (isVSK && version >= 10000)) {
            let outString = "";
            this.readIdentifier(buff, idList, outString, 512);
        }
    }

    parseAuthorChunk(buff, chunkInfo) {

    }

    parseCommunityChunk(buff, chunkInfo) {

    }

    parse(buff)
    {
        buff.seek(0+this.CHUNKS_OFFSET);
        let numChunks = buff.readUInt32();

        if(numChunks == 0) {
            return true;
        }
        else if (numChunks > 0xff) {
            return false;
        }

        let chunkId, chunkSize = 0;
        let chunkOffset = this.calcChunkOffset(numChunks)
        let chunkVersion = {}
        let chunkCommunity = {}
        let chunkAuthor = {}

        for (let counter = 1; counter <= numChunks; counter++) {
            chunkId = buff.readUInt32();
            chunkSize = buff.readUInt32();

            chunkSize &= 0x7FFFFFFF;

            switch (chunkId){
                case 0x03093000: // (TM)
                case 0x2403F000: // (VSK, TM)
                    chunkVersion.dwId = chunkId;
                    chunkVersion.dwSize = chunkSize;
                    chunkVersion.dwOffset = chunkOffset;
                    chunkOffset += chunkSize;
                    break;
                case 0x03093001: // (TM)
                case 0x2403F001: // (VSK, TM)
                    chunkCommunity.dwId = chunkId;
                    chunkCommunity.dwSize = chunkSize;
                    chunkCommunity.dwOffset = chunkOffset;
                    chunkOffset += chunkSize;
                    //OutputTextFmt(hwndCtl, szOutput, _countof(szOutput), g_szChunk, dwCouter, dwChunkId, dwChunkSize);
                    break;
    
                case 0x03093002: // (MP)
                    chunkAuthor.dwId = chunkId;
                    chunkAuthor.dwSize = chunkSize;
                    chunkAuthor.dwOffset = chunkOffset;
                    chunkOffset += chunkSize;
                    //OutputTextFmt(hwndCtl, szOutput, _countof(szOutput), g_szChunk, dwCouter, dwChunkId, dwChunkSize);
                    break;
    
                default:
                    chunkOffset += chunkSize;
                    //OutputTextFmt(hwndCtl, szOutput, _countof(szOutput), g_szChunk, dwCouter, dwChunkId, dwChunkSize);
            }
        }

        if (chunkVersion.dwSize > 0) {
            this.parseReplayChunk(buff, chunkVersion);
        }

        if (chunkCommunity.dwSize > 0) {
            this.parseCommunityChunk(buff, chunkCommunity);
        }

        if (chunkAuthor.dwSize > 0) {
            this.parseAuthorChunk(buff, chunkAuthor);
        }
    }

         
}

module.exports = gbxReplay;