#!/bin/bash

# Base dataset folder
BASE_DIR="audio_data"
CHUNK_SIZE=2000  # number of files per tar shard

# Function to shard a split
shard_split () {
    SPLIT=$1
    echo "Sharding $SPLIT..."

    cd "$BASE_DIR/$SPLIT" || exit 1

    # Create chunks with relative paths
    ls -1 | split -l $CHUNK_SIZE - "${SPLIT}_chunk_"

    # Loop over chunks and create tar.gz archives
    for chunk in ${SPLIT}_chunk_*; do
        shard_name="${SPLIT}_${chunk##*_}.tar.gz"

        # Only include files that exist (avoid empty tar)
        files=$(cat "$chunk")
        if [ -z "$files" ]; then
            echo "Skipping empty chunk $chunk"
            continue
        fi

        tar -czf "$shard_name" --no-recursion $files

        echo "Created $shard_name with $(wc -l < $chunk) files"

        # Remove the chunk file
        rm "$chunk"
    done

    cd - > /dev/null
}

# Shard all splits
for split in train validation test; do
    shard_split "$split"
done

echo "All splits have been tarred successfully!"