#!/bin/bash
# Run parallel scanning on Machine 2 in chunks (episodes 46117-92232)
# Processes in 3000-episode chunks to avoid OOM

set -e

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$SCRIPT_DIR"

# Configuration for Machine 2
TOTAL_START=46117
TOTAL_END=92233  # Exclusive, so this does 46117-92232
CHUNK_SIZE=3000
NUM_WORKERS=32   # Adjust based on available CPUs
FINAL_OUTPUT="valid_episodes_machine2.json"

echo "=========================================="
echo "DROID Scanner - Machine 2 (Chunked)"
echo "=========================================="
echo "Total range: $TOTAL_START to $((TOTAL_END-1))"
echo "Chunk size: $CHUNK_SIZE episodes"
echo "Workers per chunk: $NUM_WORKERS"
echo "Final output: $FINAL_OUTPUT"
echo "=========================================="
echo ""

# Array to store chunk output files
CHUNK_FILES=()

# Process in chunks
for ((start=$TOTAL_START; start<$TOTAL_END; start+=CHUNK_SIZE)); do
    end=$((start + CHUNK_SIZE))
    if [ $end -gt $TOTAL_END ]; then
        end=$TOTAL_END
    fi

    chunk_output="valid_episodes_machine2_chunk_${start}_${end}.json"
    CHUNK_FILES+=("$chunk_output")

    echo ""
    echo "=========================================="
    echo "Processing chunk: $start to $((end-1))"
    echo "=========================================="

    python3 scan_valid_episodes_parallel.py \
        --start $start \
        --end $end \
        --num-workers $NUM_WORKERS \
        --output "$chunk_output" \
        --batch-size 500 \
        --max-frames 400 \
        --checkpoint-interval 1000

    if [ $? -ne 0 ]; then
        echo "ERROR: Chunk $start-$((end-1)) failed"
        exit 1
    fi

    echo "✓ Chunk complete: $chunk_output"
done

echo ""
echo "=========================================="
echo "All chunks complete! Merging results..."
echo "=========================================="

# Merge all chunk results
python3 merge_scan_results.py \
    "${CHUNK_FILES[@]}" \
    --output "$FINAL_OUTPUT"

if [ $? -eq 0 ]; then
    echo ""
    echo "=========================================="
    echo "✓ Machine 2 scanning complete!"
    echo "=========================================="
    echo "Final results saved to: $FINAL_OUTPUT"
    echo ""
    echo "Chunk files created (can be deleted):"
    for chunk in "${CHUNK_FILES[@]}"; do
        echo "  - $chunk"
    done
    echo ""
    echo "Next step: Merge with Machine 1 results:"
    echo "  python merge_scan_results.py \\"
    echo "    valid_episodes_machine1.json \\"
    echo "    valid_episodes_machine2.json \\"
    echo "    --output valid_episodes_combined.json"
    echo ""
else
    echo "ERROR: Merging failed on Machine 2"
    exit 1
fi