#!/usr/bin/env bash
# Compila Spider Web (homebrew de Atari 2600 de D Cooper Dalrymple / relic-se, LGPL-3.0) do commit e1892e0
# (o HEAD do master, "Last revision: May 23rd, 2022" no README; o repositorio nao tem tags nem release
# com a ROM) com o dasm 2.20.14.1, como o build.sh do autor no modo NTSC: "dasm kernel.asm -DSYSTEM=1
# -f3" dentro de src/ (ROM crua de 4 KB). Os .asm gerados das imagens ja estao no commit, entao o passo
# assets-ntsc.sh (Python) nao muda nada e fica de fora. Dois builds seguidos dao o mesmo sha256.
#
# O repositorio traz em src/ uma copia do vcs.h 1.05, cujo cabecalho pede "PLEASE DO *NOT* REDISTRIBUTE
# THIS FILE!". Apagamos essa copia e montamos com o vcs.h 1.06 que vem com o dasm 2.20.14.1 (GPL), sem
# aquele pedido; a ROM sai identica a montada com a copia do repositorio. O macro.h do repositorio fica
# (o cabecalho so veta redistribuir versoes modificadas). O site hospeda o tarball do commit sem o vcs.h
# e sem a pasta physical/ (arte da caixa e do cartucho, que nao entra na ROM), o tarball do dasm e este
# script. Quem partir do tarball hospedado troca o GAME_SHA256 pelo dele: o rm -f abaixo nao falha.
#
#   src/FredGames.Bundler/Builds/build-spider-web.sh
#
# Saida: artifacts/build/spider-web/spider-web-ntsc.bin

set -euo pipefail

DASM=2.20.14.1
DASM_SHA256=ec71ffd10eeaa70bf7587ee0d79a92cd3f0a017c0d6d793e37d10359ceea663a
COMMIT=e1892e0b8f53af77e25daa830ab1786f647fc287
GAME_SHA256=4c34bd8d868e1c564b982fda03267df1c3c650f6a245a7a0897f0ec1f1b23b57
ROM_SHA256=b7c3586abb18c3760648af451397b2af1b2736aa3b46ce2c66aeba6969176b78

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/spider-web"
cache="$root/artifacts/build/cache"
tools="$root/artifacts/tools/dasm-$DASM"

mkdir -p "$cache"
fetch() { [ -f "$2" ] || curl -fsSL --retry 4 "$1" -o "$2"; echo "$3  $2" | shasum -a 256 -c -; }
fetch "https://github.com/dasm-assembler/dasm/archive/refs/tags/$DASM.tar.gz" "$cache/dasm-$DASM.tar.gz" "$DASM_SHA256"
fetch "https://github.com/relic-se/vcs-spider/archive/$COMMIT.tar.gz" "$cache/vcs-spider-$COMMIT.tar.gz" "$GAME_SHA256"

if [ ! -x "$tools/src/dasm" ]; then
  rm -rf "$tools" && mkdir -p "$tools"
  tar -xzf "$cache/dasm-$DASM.tar.gz" -C "$tools" --strip-components 1
  make -C "$tools/src" dasm >/dev/null 2>&1
fi

rm -rf "$out" && mkdir -p "$out/tree"
tar -xzf "$cache/vcs-spider-$COMMIT.tar.gz" -C "$out/tree" --strip-components 1 --exclude '*/physical/*'
rm -f "$out/tree/src/vcs.h"
(cd "$out/tree/src" && "$tools/src/dasm" kernel.asm -DSYSTEM=1 -f3 -I"$tools/machines/atari2600" -o"$out/spider-web-ntsc.bin" >/dev/null)
rm -rf "$out/tree"
echo "$ROM_SHA256  $out/spider-web-ntsc.bin" | shasum -a 256 -c -