#!/usr/bin/bash

# Cleanup
set -e
trap 'exit 1' SIGINT

# Constants
VERSION=2.0.0

BOOT_DIR='/boot'
ETC_DIR='/etc'
fd_opts=(--hidden --type file --type symlink --threads "$(nproc)")

# Helper functions
function help() {
    cat << HELPMESSAGE
$(basename "$0") $VERSION

Usage: $(basename "$0") [-h|--help] [options] [patterns]

Options
  -h, --help            show this help message and exit
  -b, --boot            edit a file in /boot
  -d DIR, --dir DIR     edit a file in a given directory
  -E, --etc             edit a file in /etc
  -I, --no-ignore       do not respect .(git|fd)ignore files
  -i, --no-ignore-vcs   do not respect .gitignore files

Note that this script uses EDITOR to select an editor
HELPMESSAGE
}

while true; do
    case "${1}" in
        '-b' | '--boot')
            EDIT_BOOT=1
            shift
            continue
            ;;
        '-d' | '--dir')
            DIR="${2}"
            case "${DIR}" in
                "")
                    exit 1
                    ;;
                -*)
                    exit 1
                    ;;
            esac
            shift 2
            continue
            ;;
        --dir=*)
            DIR="${1#*=}"
            case "${DIR}" in
                "")
                    exit 1
                    ;;
                -*)
                    exit 1
                    ;;
            esac
            shift
            continue
            ;;
        '-E' | '--etc')
            EDIT_ETC=1
            shift
            continue
            ;;
        '-i' | '--no-ignore-vcs')
            fd_opts+=(--no-ignore-vcs)
            shift
            continue
            ;;
        '-I' | '--no-ignore')
            fd_opts+=(--no-ignore)
            shift
            continue
            ;;
        '-h' | '--help')
            help
            exit
            ;;
        --)
            shift
            break
            ;;
        -*)
            printf '%s\n' "Unknown option: ${1}" >&2
            exit 1
            ;;
        *)
            break
            ;;
    esac
done

# Handle -b and -E, they are mutually exclusive
if [[ -n $EDIT_BOOT && -z $EDIT_ETC ]]; then
    DIR="$BOOT_DIR"
elif [[ -z $EDIT_BOOT && -n $EDIT_ETC ]]; then
    DIR="$ETC_DIR"
elif [[ -n $EDIT_BOOT && -n $EDIT_ETC ]]; then
    printf '%s\n' 'Select either --boot or --etc, not both'
    exit 1
elif [[ -z $DIR ]]; then
    DIR='.'
fi

files="$(fd "${fd_opts[@]}" -- . $DIR)"
selected_file="$(fzf --select-1 --exit-0 <<< "$files")"

if [[ -w "${selected_file}" ]]; then
    "$EDITOR" "$selected_file"
else
    sudo --edit "$selected_file"
fi