#!/usr/bin/env bash

# Script converts audio files (m4a, mp4, 3gp, webm, wav) to opus format
# Uses the same parameters as the original script for wav

# Check if a directory was provided as an argument, if not - use current directory
DIR="${1:-.}"

# Navigate to the directory
cd "$DIR" || { echo "Cannot navigate to directory: $DIR"; exit 1; }

# Formats to convert
FORMATS=("mp3" "m4a" "mp4" "3gp" "webm" "wav")

# Counters
total_converted=0
total_skipped=0
total_errors=0

echo "Starting audio file conversion to opus..."
echo "Parameters: mono, 32k bitrate, metadata preservation"
echo ""

# Process each format
for format in "${FORMATS[@]}"; do
    for file in *."$format"; do
        # Check if the file exists
        [[ -f "$file" ]] || continue

        # Get the name without extension
        basename="${file%.$format}"
        output_file="${basename}.opus"
        
        # Check if the target file already exists
        if [[ -f "$output_file" ]]; then
            echo "SKIPPED: $file (file $output_file already exists)"
            ((total_skipped++))
            continue
        fi
        
        # Convert the file
        echo "CONVERTING: $file → $output_file"
        
        if ffmpeg -i "$file" -acodec libopus -ac 1 -ab 32k -map_metadata 0 -id3v2_version 3 -write_id3v1 1 "$output_file" -loglevel error -stats; then
            ((total_converted++))
            echo "✓ Success: $output_file"
        else
            ((total_errors++))
            echo "✗ Error converting: $file"
        fi
        echo ""
    done
done

echo ""
echo "=== SUMMARY ==="
echo "Converted: $total_converted files"
echo "Skipped: $total_skipped files (already existed)"
echo "Errors: $total_errors files"