#!/bin/sh

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

# List and handle oldfiles
list_oldfiles() {
  # Fetch the oldfiles list from Neovim
  oldfiles=$(nvim -u NONE --headless +'lua io.write(table.concat(vim.v.oldfiles, "\n") .. "\n")' +qa)

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

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

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

    # Use fzf to select files
    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)

    # Exit if no files were selected
    [ -z "$selected_files" ] && exit 1

    # Open selected files in Neovim
    openfiles "$selected_files"
    ;;
  *)
    # Open the most recent 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 "$@"