#!/bin/sh -efu

# This posix shell script makes it easier to manage your shore house using NPS
# Updated on 20-05-2025

NPS_HOST="${NPS_HOST:-nightfall.city}"
NPS_PORT="${NPS_PORT:-1915}"
NPS_NEX_PORT="${NPS_NEX_PORT:-1900}"
NPS_SECRET="${NPS_SECRET:-"${XDG_CONFIG_HOME:-~/.config}/nps.secret"}"

die() {
	printf "%s\n" "$1"
	exit 1
}

print_help() {
	die "Simple script to interact with your Nightfall City's Postal Service (NPS)
Usage: nf <command> [<arguments>]
Commands:
  u|up|upload <path> [<source>]
  mkdir <path>
  rm <path>
  edit <path>
  cat [<user>] <path>
  water

Environment:
  NPS_HOST (default: nightfall.city)
  NPS_PORT (default: 1915)
  NPS_SECRET (default: \$XDG_CONFIG_HOME/nps.secret)
  NPS_USERNAME (overwrites the username from the secret file)
  NPS_TOKEN (overwrites the citizen id from the secret file)"
}

load_username() {
	NPS_USERNAME="${NPS_USERNAME:-"$(sed '1q;d' "$NPS_SECRET")"}"
	if [ -z "$NPS_USERNAME" ]
	then
		die "Username expected at line 1 of id"
	fi
}

load_token() {
	NPS_TOKEN="${NPS_TOKEN:-"$(sed '2q;d' "$NPS_SECRET")"}"
	if [ -z "$NPS_TOKEN" ]
	then
		die "Token expected at line 2 of id"
	fi
}

upload() {
	if [ "$#" -ne 2 ] && [ "$#" -ne 1 ]
	then
		die "Usage: upload <dest> [<source>]"
	fi

	load_username
	load_token

	content="$(cat "${2:--}")"

	printf "shore/%s/%s\n%s\n%s\n.\n" \
		"${NPS_USERNAME}" \
		"${1}" \
		"${NPS_TOKEN}" \
		"${content}" \
		| nc "$NPS_HOST" "$NPS_PORT"
}

edit() {
	if [ "$#" -ne 1 ]
	then
		die "Usage: edit <path>"
	fi

	load_username
	load_token

	tmpfile="$(mktemp -u --suffix .nps."$(basename "${1}")")"

	#shellcheck disable=SC2064
	trap "rm -f ${tmpfile}; trap - EXIT; exit" EXIT INT HUP

	printf "shore/%s/%s/\n.\n" \
		"${NPS_USERNAME}" \
		"${1}" \
		| nc "$NPS_HOST" "$NPS_NEX_PORT" > "$tmpfile"

	content="$(cat "$tmpfile")"

	old="$(stat -c%Y "$tmpfile")"
	${EDITOR} "$tmpfile"
	new="$(stat -c%Y "$tmpfile")"
	content="$(cat "$tmpfile")"

	if [ "$old" = "$new" ]
	then
		die "File unchanged"
	else
		printf "shore/%s/%s\n%s\n%s\n.\n" \
			"${NPS_USERNAME}" \
			"${1}" \
			"${NPS_TOKEN}" \
			"${content}" \
			| nc "$NPS_HOST" "$NPS_PORT"
	fi
}

delete() {
	if [ "$#" -ne 1 ]
	then
		die "Usage: delete <path>"
	fi

	load_username
	load_token

	printf "shore/%s/%s\n%s\nDELETE\n.\n" \
		"${NPS_USERNAME}" \
		"${1}" \
		"${NPS_TOKEN}" \
		| nc "$NPS_HOST" "$NPS_PORT"

}

mkdir() {
	if [ "$#" -ne 1 ]
	then
		die "Usage: mkdir <path>"
	fi

	load_username
	load_token

	printf "shore/%s/%s\n%s\nCREATE_DIR\n.\n" \
		"${NPS_USERNAME}" \
		"${1}" \
		"${NPS_TOKEN}" \
		| nc "$NPS_HOST" "$NPS_PORT"

}

water() {
	if [ "$#" -ne 0 ]
	then
		die "Usage: water"
	fi

	load_token

	printf "shore/garden/water/\n%s\n.\n" \
		"${NPS_TOKEN}" \
		| nc "$NPS_HOST" "$NPS_PORT"

}

cat_() {
	if [ "$#" -eq 0 ]
	then
		load_username
		path=/
	elif [ "$#" -eq 1 ]
	then
		load_username
		path="${1}"
	elif [ "$#" -eq 2 ]
	then
		NPS_USERNAME="${1}"
		path="${2}"
	else
		die "Usage: cat [<user>] [<path>]"
	fi

	printf "shore/%s/%s/\n.\n" \
		"${NPS_USERNAME}" \
		"${path}" \
		| nc "$NPS_HOST" "$NPS_NEX_PORT"

}

main() {
	if [ "$#" -le 0 ]
	then
		print_help
	fi

	cmd="$1"
	shift
	case "$cmd" in
		"u"|"up"|"upload") upload "$@" ;;
		"e"|"edit") edit "$@" ;;
		"c"|"cat") cat_ "$@" ;;
		"mkdir") mkdir "$@" ;;
		"rm") delete "$@" ;;
		"water") water "$@" ;;
		# "h"|"help") print_help ;;
		*) print_help ;;
	esac
}

main "$@"