#!/bin/sh

# Display help message
usage() {
  echo "Open the most recent file or the list of old files in fzf edited by Vim."
  echo ""
  echo "Usage: ${0##*/} [OPTION]"
  echo ""
  echo "Options:"
  echo "                  : Open the most recent old file in Vim."
  echo "  -h, --help      : Show this help message."
  echo "  -l, --list      : Show all recent files in Vim using fzf."
  echo ""
  echo "Examples:"
  echo "  ${0##*/}        # Open the most recent file."
  echo "  ${0##*/} -l     # Show all recent files in fzf and select to open."
  exit 0
}

# Fetch oldfiles from Vim
get_oldfiles() {
  vim -u NONE -es +'silent oldfiles' +qa 2>/dev/null |
    sed 's/^[0-9]\+\s\+//' |
    grep -v "^$"
}

# List and handle oldfiles
list_oldfiles() {
  oldfiles=$(get_oldfiles)

  # Exit if no oldfiles are found
  [ -z "$oldfiles" ] && {
    echo "No recent files found in Vim." >&2
    exit 1
  }

  case "$1" in
  -h | --help)
    usage
    ;;
  -l | --list)
    valid_files=$(echo "$oldfiles" | while IFS= read -r file; do
      [ -f "$file" ] && printf "%s\n" "$file"
    done)

    [ -z "$valid_files" ] && {
      echo "No valid files found." >&2
      exit 1
    }

    selected_files=$(echo "$valid_files" |
      fzf-tmux \
        --multi \
        --preview 'bat -n --color=always --line-range=:500 {} 2>/dev/null || echo "Error previewing file"' \
        --height=70% \
        --reverse)

    [ -z "$selected_files" ] && exit 1

    openfiles $selected_files
    ;;
  *)
    # Open the most recent valid file
    for file in $oldfiles; do
      if [ -f "$file" ]; then
        openfiles "$file"
        exit 0
      fi
    done

    echo "No valid recent files found." >&2
    exit 1
    ;;
  esac
}

# Parse command-line arguments
list_oldfiles "$@"