# Description: Converts HEIC images to any image format available using ImageMagick
# License: GPL-2.0+
# Version: 1.0.0
function convert_heic() {

  # Function to display usage information
  function usage() {
    cat << EOF
USAGE:
  ${ZSH_SCRIPT:t} [-d] [-h] [--format=<format>] [format]

OPTIONS:
  -d                 Delete original HEIC files after conversion
  -h                 Show this help message
  --format=<format>  Specify output format (default: png)
  format             Specify output format without using --format option
                     Supported formats depends on ImageMagick's capabilities

EXAMPLES:
  ${ZSH_SCRIPT:t} -d --format=png        # Convert to PNG and delete originals
  ${ZSH_SCRIPT:t} --format=jpg           # Convert to JPG and keep originals
  ${ZSH_SCRIPT:t} gif -d                 # Convert to GIF and delete originals
  ${ZSH_SCRIPT:t} -d png                 # Convert to PNG and delete originals
  ${ZSH_SCRIPT:t}                        # Convert to PNG and keep originals
EOF
  }

  # Default settings
  local output_format="png"
  local delete_original=false
  local proceed_with_conversion=true

  # Parse options
  for arg in "$@"; do
    case "$arg" in
      -d)
        delete_original=true
        ;;
      --format=*)
        output_format="${arg#*=}"
        ;;
      -h)
        usage
        return 0
        ;;
      -*)
        echo "Unrecognized option: $arg"
        usage
        return 1
        ;;
      *)
        # Assume it's a format if not recognized as an option
        # Only set if output_format is still default to avoid overriding --format option
        if [[ $output_format == "png" ]]; then
          output_format="$arg"
        fi
        ;;
    esac
  done

  if ! $proceed_with_conversion; then
    return 0
  fi

  echo "Converting HEIC images to $output_format..."
  if $delete_original; then
    echo "Original files will be deleted."
  fi

  # Main conversion logic, adjusted for case-insensitive extension match
  for file in *; do
    if [[ -f "$file" && "${file##*.}" =~ ^[Hh][Ee][Ii][Cc]$ ]]; then
      echo "- Converting $file to ${output_format}..."
      convert "$file" "${file%.*}.$output_format"
      if $delete_original; then
        echo "- Deleting original: $file"
        rm "$file"
      fi
    fi
  done

}