EXEC_SHELL_PATH=$(command -v bash)


# Function to display script usage
usage() {
    echo "Usage: $0 [--high] input_video"
    echo "  --high: Preserve original resolution of the input video"
    exit 1
}

# Check if FFmpeg is installed
if ! command -v ffmpeg &>/dev/null; then
    echo "Error: FFmpeg is not installed. Please install FFmpeg first."
    exit 1
fi

# Parse command line options
preserve_resolution=false

while [[ "$#" -gt 0 ]]; do
    case $1 in
        --high)
            preserve_resolution=true
            shift
            ;;
        *)
            input_file="$1"
            shift
            ;;
    esac
done

# Check if input file is provided
if [ -z "$input_file" ]; then
    usage
fi

# Check if input file exists
if [ ! -f "$input_file" ]; then
    echo "Error: Input file '$input_file' not found."
    exit 1
fi

# Output folder and file paths
output_folder="/mnt/Zonai/Videos/converted_for_compatibility"
output_filename="compatible-$(basename "$input_file" | sed 's/[^a-zA-Z0-9._-]/_/g')"
output_file="$output_folder/$output_filename"

# Check if the output folder exists and is writable
if [ ! -d "$output_folder" ] || [ ! -w "$output_folder" ]; then
    echo "Error: Output folder '$output_folder' does not exist or is not writable."
    exit 1
fi

# If output file already exists, delete it
if [ -e "$output_file" ]; then
    echo "Output file '$output_file' already exists. Deleting it..."
    rm -f "$output_file"
fi

# Copy the input video to RAM
temp_file=$(mktemp -u)
cp "$input_file" "$temp_file"

# Set the number of threads to 32 (adjust as needed)
threads=32

# Set the output resolution based on the --high parameter
if [ "$preserve_resolution" = true ]; then
    output_resolution="scale='iw:-1'"
else
    output_resolution="640x360"
fi

# Perform the encoding and compression on the video in RAM
ffmpeg -i "$temp_file" -c:v libx264 -pix_fmt yuv420p -preset veryslow -crf 25 -vf "$output_resolution" -c:a aac -b:a 128k -y "$output_file"

# Check if ffmpeg command was successful
if [ $? -ne 0 ]; then
    echo "Error: FFmpeg command failed."
    rm -f "$temp_file"
    exit 1
fi

# Check if the output file was created successfully
if [ ! -f "$output_file" ]; then
    echo "Error: Output file '$output_file' not created."
    rm -f "$temp_file"
    exit 1
fi

# Increase the volume by 10 times
ffmpeg -i "$output_file" -af "volume=10.0" -c:v copy "$output_file"_loud.mp4

# Check if ffmpeg command was successful
if [ $? -ne 0 ]; then
    echo "Error: FFmpeg command failed."
    rm -f "$temp_file"
    exit 1
fi

# Move the loud file to original output file
mv "$output_file"_loud.mp4 "$output_file"

# Check if the output file was created successfully
if [ ! -f "$output_file" ]; then
    echo "Error: Output file '$output_file' not created."
    rm -f "$temp_file"
    exit 1
fi

echo "Video conversion successful. Output file: $output_file"

# Clean up temporary file in RAM
rm -f "$temp_file"