#!/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-amiga-tilebank.sh - Tile-bank gate for the Amiga: proves that
# assetbake's amiga encoder (plane-major: 8 rows of plane 0, then plane 1, ...)
# writes exactly the layout the Amiga's native tile paste
# (src/m68k/planarTile.h via src/amiga/amigaTile.h) reads, and that the Amiga
# build refuses a bank baked for any other target.
#
# Boots an A500 (real Kickstart) in FS-UAE under Xvfb from a scratch directory
# hard drive whose startup-sequence runs TileBank (examples/tilebank), with
# the DATA/tilebank make/amiga.mk staged from the host gate's fixture beside
# it. The program loads its own bake through jlTileBankLoadToSurface and
# through jlTileBankLoad + jlTilePaste, checks every pixel of both against the
# PNG, hashes both, and tries every other target's bake; its TILEBANK line in
# joeylog.txt must say PASS with both hashes equal to the host gate's
# (scripts/check-tilebank.sh, run here for the value) and every other target
# refused. FS-UAE is stopped as soon as the line appears.
#
# Usage:   scripts/verify-amiga-tilebank.sh
# Env:     TILEBANK_DATA_DIR  stage this DATA/tilebank instead (negative controls)
# Requires: fs-uae, the Kickstart, Xvfb, a host cc; build/amiga/bin/TileBank
#           and its DATA/tilebank (make amiga).
set -uo pipefail

repo=$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)
source "$repo/scripts/lib/joeyEnv.sh"
source "$repo/scripts/lib/tileBankGate.sh"
joeyNeed FSUAE fsuae
source "$repo/scripts/lib/amigaGate.sh"
amigaMachine

binDir=$repo/build/amiga/bin
dataDir=$(tileBankData "$binDir")
wall=180            # hard cap on FS-UAE, whatever happens to this script
lineSeconds=150     # a real-time boot plus the checks

tileBankNeedBuild "$binDir/TileBank" "$dataDir" "make amiga"
tileBankReference

work=$(mktemp -d -t joeylib-amiga-tilebank.XXXXXX)
guard=""
fsuae=""
xvfb=""
# 2>/dev/null: bash reports the SIGKILLed timeout wrapper as "Killed".
cleanup() {
    joeyStop "$fsuae" "$guard" "$xvfb" 2> /dev/null
    rm -rf "$work"
}
trap cleanup EXIT

mkdir -p "$work/hd/s" "$work/hd/DATA"
cp "$binDir/TileBank" "$work/hd/"
cp -r "$dataDir" "$work/hd/DATA/tilebank"
echo ":TileBank" > "$work/hd/s/startup-sequence"

display=":$((RANDOM % 400 + 1300))"
Xvfb "$display" -screen 0 800x600x24 -nolisten tcp > /dev/null 2>&1 &
xvfb=$!
sleep 1

# 2 MB of fast memory: a bare 512 KB A500 fails jlInit.
DISPLAY="$display" timeout -s KILL "$wall" "$FSUAE" \
    "${AMIGA_MACHINE_ARGS[@]}" \
    --fast_memory=2048 \
    --hard_drive_0="$work/hd" \
    --hard_drive_0_label=JOEYLIB \
    --automatic_input_grab=0 \
    --fullscreen=0 \
    --fade_out_duration=0 > "$work/fsuae.log" 2>&1 &
guard=$!
fsuae=$(joeyChild "$guard")

log=$(tileBankAwaitLine "$work/hd" "$lineSeconds" "$guard")
joeyStop "$fsuae" "$guard" 2> /dev/null
fsuae=""
guard=""
if [ -z "$log" ]; then
    echo "verify-amiga-tilebank: FAIL - no TILEBANK line within ${lineSeconds}s" >&2
    tail -5 "$work/fsuae.log" >&2
    exit 1
fi
tileBankJudge "$log"