#!/bin/bash

# Function to handle single file conversion
convert_file() {
  local INPUT_FILE="$1"

  # Check if file exists
  if [ ! -f "$INPUT_FILE" ]; then
    echo "Warning: File '$INPUT_FILE' not found. Skipping."
    return
  fi

  # Get path and filename info
  local DIRNAME=$(dirname -- "$INPUT_FILE")
  local FILENAME=$(basename -- "$INPUT_FILE")
  local FILENAME_NO_EXT="${FILENAME%.*}"

  # Define output filename in the same directory
  local OUTPUT_FILE="${DIRNAME}/${FILENAME_NO_EXT}.wav"

  # Check if we are trying to convert a wav to wav (avoid redundant work or loops)
  if [[ "$INPUT_FILE" == *.wav ]]; then
      echo "Skipping .wav file: $INPUT_FILE"
      return
  fi

  echo "Processing '$INPUT_FILE' -> '$OUTPUT_FILE'..."

  # Run ffmpeg command
  # -y overwrites output files without asking
  # -v error -stats reduces output verbosity but keeps progress/errors
  ffmpeg -i "$INPUT_FILE" -ar 16000 -ac 1 -c:a pcm_s16le -y "$OUTPUT_FILE" < /dev/null -v error -stats

  if [ $? -eq 0 ]; then
    echo -e "\nSuccess: '$OUTPUT_FILE' created."
  else
    echo -e "\nError converting '$INPUT_FILE'."
  fi
  echo "----------------------------------------"
}

# Check if at least one input is provided
if [ -z "$1" ]; then
  echo "Usage: $0 <file_or_folder> [file_or_folder2 ...]"
  exit 1
fi

# Loop through all provided arguments
for ARG in "$@"; do
  # Check for SMB/Network URIs which standard shell tools don't support directly
  if [[ "$ARG" == smb://* ]]; then
    echo "Error: Network URI '$ARG' detected."
    echo "This script works on filesystem paths. Please mount the network share first."
    echo "  - Linux (GVFS): Check /run/user/\$UID/gvfs/"
    echo "  - macOS: Check /Volumes/"
    echo "  - Windows (WSL): Mount the drive to a letter or /mnt/"
    continue
  fi

  if [ -d "$ARG" ]; then
    # It's a directory: find files recursively
    echo "Scanning directory '$ARG' for video files..."
    
    # Find common video files (case insensitive)
    # Using -print0 and while read loop handles filenames with spaces correctly
    find "$ARG" -type f \( \
      -iname "*.mp4" -o \
      -iname "*.mkv" -o \
      -iname "*.mov" -o \
      -iname "*.avi" -o \
      -iname "*.webm" -o \
      -iname "*.flv" -o \
      -iname "*.wmv" -o \
      -iname "*.m4v" -o \
      -iname "*.mpg" -o \
      -iname "*.mpeg" -o \
      -iname "*.3gp" -o \
      -iname "*.ts" \
    \) -print0 | while IFS= read -r -d '' FOUND_FILE; do
      convert_file "$FOUND_FILE"
    done

  elif [ -f "$ARG" ]; then
    # It's a single file
    convert_file "$ARG"
  else
    echo "Warning: '$ARG' is not a valid file or directory."
  fi
done