#!/bin/bash


# Directory containing your .wav files
directory="$(dirname "$0")"

# Create or empty the filelist.txt
#> filelist.txt
# Create or empty the filelist.txt
> filelist.txt

# Loop through .mp3 files and add to filelist.txt
#for file in "$directory"/*.mp3; do
#    echo "$file" >> filelist.txt
#done

for file in $(ls "$directory"/*.mp3 | sort -V); do
    echo "$file" >> filelist.txt
done


CHUNK_SIZE=30000000  # 30MB in bytes
OUTPUT_DIR="concat"
mkdir -p $OUTPUT_DIR

current_chunk_size=0
chunk_index=1
chunk_files=""

while read -r file; do
    echo "Processing file: $file"
    if [[ ! -f "$file" ]]; then
        echo "File not found: $file"
        continue
    fi
    file_size=$(stat -c%s "$file")
    echo "File size: $file_size bytes"
    if (( current_chunk_size + file_size > CHUNK_SIZE )); then
        echo "Creating chunk $chunk_index"
        ffmpeg -y -i "concat:${chunk_files:1}" -c copy "$OUTPUT_DIR/chunk_$chunk_index.mp3"
        ((chunk_index++))
        current_chunk_size=0
        chunk_files=""
    fi
    current_chunk_size=$((current_chunk_size + file_size))
    chunk_files="${chunk_files}|$file"
done < filelist.txt

if [[ -n $chunk_files ]]; then
    echo "Creating final chunk $chunk_index"
    ffmpeg -y -i "concat:${chunk_files:1}" -c copy "$OUTPUT_DIR/chunk_$chunk_index.mp3"
fi