#!/usr/bin/env bash
# Part of JoeyLib, Copyright (c) 2026 Scott Duensing, under the MIT License.
# See LICENSE.md for license information.
# SPDX-License-Identifier: MIT
#
# verify-web-save.sh - Save gate for the web port: a save outlives the page.
#
# A web program's SAVES/ is kept in the browser's IndexedDB (the SDL3
# backend mounts IDBFS there and writes it back every two seconds). SAVE
# (examples/save) counts its launches in SAVES/runs.dat, so its page is
# opened in headless Chromium, given time to write, opened again
# (reloaded), and given time again: the count it then holds must be 2 --
# the first launch's 1 came back from IndexedDB and the second launch added
# one.
#
# Usage:   scripts/verify-web-save.sh
# Requires: Chromium, emsdk's node; build/web/bin/SAVE (make web).
set -euo pipefail

repo=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
source "$repo/scripts/lib/joeyEnv.sh"
source "$repo/scripts/lib/webGate.sh"
webNeed

dir=$repo/build/web/bin/SAVE
[ -f "$dir/SAVE.html" ] || { echo "verify-web-save: build SAVE first (make web)" >&2; exit 2; }

work=$(mktemp -d -t joeylib-web-save.XXXXXX)
cleanup() {
    webStop
    rm -rf "$work"
}
trap cleanup EXIT

webServe "$dir"
webDrive "SAVE.html" --step wait:4 --step reload --step wait:4 --file "/SAVES/runs.dat:$work/runs.dat"
count=$(python3 -c "import struct, sys; print(struct.unpack('<H', open(sys.argv[1], 'rb').read(2))[0])" "$work/runs.dat")
if [ "$count" = 2 ]; then
    echo "verify-web-save: PASS (the second launch counted 2: the first launch's save came back from IndexedDB)"
else
    echo "verify-web-save: FAIL - the second launch counted $count, not 2" >&2
    exit 1
fi