// Asura Engine archive format
// Used by Rebellion games: Sniper Elite series, AVP 2010, etc.
// Archives contain chunks like FCSR (resources), TSXT (textures), LFSR (lists), etc.

type asura_archive [display="Asura Archive"] byteorder BE
{
    criteria {
        // Match "Asura   " signature (8 bytes with trailing spaces)
        require ascii(bytesat(0, 8)) == "Asura   ";
    }

    // Store base name for chunk naming (use full filename, not basename)
    base_name = _name;

    // Set display name for this archive
    _name = base_name + ".asr";

    // Asura signature
    signature = ascii(read(8));
    signature = signature [ui, readonly, display="Signature"];

    // Track chunk index
    chunk_index = 0;

    // Parse chunks until end of file (need at least 16 bytes for header)
    while (pos() + 16 <= size()) {
        // Save chunk start position
        chunk_start = pos();

        // Peek at chunk header to get ID and size
        peek_id = ascii(read(4));
        u32 peek_size;

        // Seek back to chunk start for proper parsing
        seek(chunk_start);

        // Validate chunk - if peek_size is 0 or invalid, stop parsing
        if (peek_size == 0 || peek_size > size() - chunk_start) {
            remaining = size() - pos();
            if (remaining > 0) {
                raw_tail = read(remaining);
                raw_tail = raw_tail [ui, display="Raw Tail Data"];
            }
            break;
        }

        // Set chunk name before parsing (child will inherit this)
        _name = base_name + ".chunk" + chunk_index;

        // Dispatch to appropriate chunk type based on ID and push to arrays
        if (peek_id == "FCSR" || peek_id == "RSCF") {
            chunk = parse_here("fcsr_chunk");
            push("fcsr_chunks", chunk);
        } else if (peek_id == "TSXT" || peek_id == "TXST") {
            chunk = parse_here("tsxt_chunk");
            push("tsxt_chunks", chunk);
        } else if (peek_id == "LFSR" || peek_id == "RSFL") {
            chunk = parse_here("lfsr_chunk");
            push("lfsr_chunks", chunk);
        } else if (peek_id == "STSA" || peek_id == "ASTS") {
            chunk = parse_here("stsa_chunk");
            push("stsa_chunks", chunk);
        } else if (peek_id == "TXET" || peek_id == "TEXT") {
            chunk = parse_here("txet_chunk");
            push("txet_chunks", chunk);
        } else if (peek_id == "GSMS" || peek_id == "SMSG") {
            chunk = parse_here("gsms_chunk");
            push("gsms_chunks", chunk);
        } else if (peek_id == "ITNE" || peek_id == "ENTI") {
            chunk = parse_here("itne_chunk");
            push("itne_chunks", chunk);
        } else if (peek_id == "STUC" || peek_id == "CUTS") {
            chunk = parse_here("stuc_chunk");
            push("stuc_chunks", chunk);
        } else if (peek_id == "CATC") {
            chunk = parse_here("catc_chunk");
            push("catc_chunks", chunk);
        } else if (peek_id == "RTTC") {
            chunk = parse_here("rttc_chunk");
            push("rttc_chunks", chunk);
        } else if (peek_id == "VETC") {
            chunk = parse_here("vetc_chunk");
            push("vetc_chunks", chunk);
        } else if (peek_id == "POSE") {
            chunk = parse_here("pose_chunk");
            push("pose_chunks", chunk);
        } else if (peek_id == "PVET") {
            chunk = parse_here("pvet_chunk");
            push("pvet_chunks", chunk);
        } else if (peek_id == "TATC") {
            chunk = parse_here("tatc_chunk");
            push("tatc_chunks", chunk);
        } else if (peek_id == "TTAT") {
            chunk = parse_here("ttat_chunk");
            push("ttat_chunks", chunk);
        } else if (peek_id == "TVET") {
            chunk = parse_here("tvet_chunk");
            push("tvet_chunks", chunk);
        } else if (peek_id == "UCAT") {
            chunk = parse_here("ucat_chunk");
            push("ucat_chunks", chunk);
        } else if (peek_id == "UVET") {
            chunk = parse_here("uvet_chunk");
            push("uvet_chunks", chunk);
        } else {
            // Unknown chunk type - parse as generic chunk
            chunk = parse_here("asura_chunk");
            push("unknown_chunks", chunk);
        }

        // Increment chunk index
        chunk_index = chunk_index + 1;

        // Seek to next chunk (chunk_start + peek_size)
        next_chunk = chunk_start + peek_size;
        if (next_chunk > size()) {
            break;
        }
        seek(next_chunk);
    }

    // Restore archive name and show total count
    _name = base_name + ".asr";
    chunk_count = chunk_index;
    chunk_count = chunk_count [ui, readonly, display="Total Chunks"];
}