#!/usr/bin/env bash
#
# Run the accessibility testbed against a clean save, WITHOUT destroying the
# player's real one.
#
# The testbed drives a fresh playthrough from the main menu, so it needs the
# LOVE save directory empty -- otherwise "Continue" appears, the new-game flow
# differs, and the prologue it navigates has already happened. That clean-out
# used to be a bare `rm -rf` in the docs, which silently ate a real save every
# time someone ran the tests.
#
# This cannot be done from inside the mod: love.load() reads config, keybindings
# and user data long before main.lua reaches our entry point, so by the time any
# Lua of ours runs the save directory has already been read. It has to happen
# around the process.
#
# So: MOVE the save aside (never delete it), run, then move it back. The test
# run's own save directory is discarded, leaving the tree exactly as it was.
#
# Usage:  accessibility/tests/run-testbed.sh [extra love args...]

set -uo pipefail

LOVE="${LOVE:-C:/Program Files/LOVE/lovec.exe}"
GAME_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"

# LOVE writes to <appdata>/LOVE/<t.identity>; conf.lua sets identity "Alchemist".
SAVE_DIR="${APPDATA:-$HOME/AppData/Roaming}/LOVE/Alchemist"
BACKUP_DIR="${SAVE_DIR}.a11y-backup.$$"

restored=0

restore() {
	# Idempotent: this runs from the EXIT trap and possibly from a signal trap.
	if [ "$restored" -eq 1 ]; then
		return
	fi
	restored=1

	# Throw away whatever the test run created, but only if we know it is ours
	# (i.e. we successfully moved the real save out of the way first).
	if [ -d "$BACKUP_DIR" ]; then
		rm -rf "$SAVE_DIR"
		if mv "$BACKUP_DIR" "$SAVE_DIR"; then
			echo "[testbed] real save restored to $SAVE_DIR"
		else
			# Loud, and non-destructive: the save is still on disk, just parked.
			echo "[testbed] !! COULD NOT RESTORE YOUR SAVE." >&2
			echo "[testbed] !! It is safe at: $BACKUP_DIR" >&2
			echo "[testbed] !! Move it back to: $SAVE_DIR" >&2
			exit 1
		fi
	else
		# There was no save to begin with; don't leave the test run's one behind
		# to be mistaken for a real save later.
		rm -rf "$SAVE_DIR"
	fi
}

# Checked BEFORE anything is moved, so a bad LOVE path can't leave the save
# parked under a backup name.
if [ ! -f "$LOVE" ]; then
	echo "[testbed] LOVE not found at: $LOVE" >&2
	echo "[testbed] set LOVE=/path/to/lovec.exe" >&2
	exit 1
fi

trap restore EXIT
trap 'restore; exit 130' INT TERM

if [ -e "$SAVE_DIR" ]; then
	if ! mv "$SAVE_DIR" "$BACKUP_DIR"; then
		echo "[testbed] could not move the save aside; refusing to run rather than" >&2
		echo "[testbed] risk your save. Is the game still open?" >&2
		exit 1
	fi
	echo "[testbed] real save parked at $BACKUP_DIR"
else
	echo "[testbed] no existing save to protect"
fi

"$LOVE" "$GAME_DIR" --a11y-test "$@"
status=$?

exit $status