#!/bin/bash

INPUT_DIR="/mnt/jonathanDisk/ivritData"
OUTPUT_DIR="/mnt/jonathanDisk/ivritDataOpus"
CACHE_DIR="$HOME/ivritCache"

WORKERS=24

echo "Initializing FFmpeg CPU flood with $WORKERS workers..."
echo "Input: $INPUT_DIR"
echo "Output: $OUTPUT_DIR"
echo "SSD Cache: $CACHE_DIR"

# Ensure all base directories exist
mkdir -p "$OUTPUT_DIR"
mkdir -p "$CACHE_DIR"

# 1. Find all audio files
# 2. Pipe into xargs with -P to run $WORKERS in parallel
# 3. Pass infile, input_dir, output_dir, and cache_dir cleanly into the subshell
find "$INPUT_DIR" -type f \( -iname \*.wav -o -iname \*.mp3 -o -iname \*.flac -o -iname \*.m4a -o -iname \*.ogg \) -print0 | xargs -0 -P "$WORKERS" -I {} bash -c '
    infile="$1"
    in_dir="$2"
    out_dir="$3"
    cache_dir="$4"
    
    # Calculate the relative path to maintain your exact folder hierarchy
    relpath="${infile#$in_dir/}"
    
    # Define target and cache subfolders
    target_folder="$out_dir/$(dirname "$relpath")"
    cache_folder="$cache_dir/$(dirname "$relpath")"
    
    # Create the specific subfolders if they do not exist
    mkdir -p "$target_folder"
    mkdir -p "$cache_folder"
    
    # Swap the original extension to .opus
    filename=$(basename "$infile")
    cachefile="$cache_folder/${filename%.*}.opus"
    outfile="$target_folder/${filename%.*}.opus"
    
    # Run FFmpeg writing to the SSD Cache first
    # Using && ensures we only move the file if the encoding succeeded without errors
    if ffmpeg -y -hide_banner -loglevel error -i "$infile" -ar 16000 -c:a libopus "$cachefile"; then
        mv "$cachefile" "$outfile"
    else
        echo "Error encoding: $infile"
    fi
' _ {} "$INPUT_DIR" "$OUTPUT_DIR" "$CACHE_DIR"

echo "Pipeline complete! All files converted and moved to HDD."