#!/usr/bin/env bash
# Compila Rebound (homebrew de Game Boy Color de DevEd e colaboradores, MIT) do commit cc2966e com o RGBDS
# 0.9.0. O autor nao publica a ROM no repositorio: o build.sh dele converte os mapas (convertmap.py) e monta
# com rgbasm/rgblink/rgbfix, e o script refaz esses passos. O patch Builds/rebound-gb/release-no-compo-logo.patch
# desliga o DebugMode do Main.asm (o repositorio vem com ele ligado: a ROM abre num menu de depuracao) e tira da sequencia de aberturas a tela com o logo da GB Compo 2021 (marca de terceiros).
#
# O RGBDS precisa do Bison 3 para gerar o parser do rgbasm (o do macOS e o 2.3): o script compila o GNU
# Bison 3.8.2 e o RGBDS (so rgbasm, rgblink e rgbfix) em artifacts/tools/.
#
#   src/FredGames.Bundler/Builds/build-rebound-gb.sh
#
# Saida: artifacts/build/rebound-gb/Rebound.gbc

set -euo pipefail

BISON=3.8.2
BISON_SHA256=9bba0214ccf7f1079c5d59210045227bcf619519840ebfa80cd3849cff5a5bf2
RGBDS=0.9.0
RGBDS_SHA256=2be649a6b3c3b4a462e222b3082fa2e1c83142f317ba862b17899f5a25717380
COMMIT=cc2966e1643d480d0780fb6cc5b9ef53d5ef6898
GAME_SHA256=d814a48faff37a920cc0cefa3087d6437e470f52bb12e708a36d792aefee3ec1
ROM_SHA256=2ac93dd331bf590532900203c5ede5c560d06f31b6327867db62349844c30504

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/rebound-gb"
cache="$root/artifacts/build/cache"
bison="$root/artifacts/tools/bison-$BISON"
rgbds="$root/artifacts/tools/rgbds-$RGBDS"

mkdir -p "$cache"
fetch() { [ -f "$2" ] || curl -fsSL --retry 4 "$1" -o "$2"; echo "$3  $2" | shasum -a 256 -c -; }
fetch "https://ftp.gnu.org/gnu/bison/bison-$BISON.tar.xz" "$cache/bison-$BISON.tar.xz" "$BISON_SHA256"
fetch "https://github.com/gbdev/rgbds/archive/refs/tags/v$RGBDS.tar.gz" "$cache/rgbds-$RGBDS.tar.gz" "$RGBDS_SHA256"
fetch "https://github.com/DevEd2/ReboundGB/archive/$COMMIT.tar.gz" "$cache/ReboundGB-$COMMIT.tar.gz" "$GAME_SHA256"

if [ ! -x "$bison/bin/bison" ]; then
  rm -rf "$bison" "$bison.src" && mkdir -p "$bison.src"
  tar -xJf "$cache/bison-$BISON.tar.xz" -C "$bison.src" --strip-components 1
  (cd "$bison.src" && ./configure --prefix="$bison" --disable-nls >/dev/null && make -j8 >/dev/null && make install >/dev/null)
  rm -rf "$bison.src"
fi

if [ ! -x "$rgbds/rgbasm" ] || [ ! -x "$rgbds/rgblink" ] || [ ! -x "$rgbds/rgbfix" ]; then
  rm -rf "$rgbds.src" && mkdir -p "$rgbds.src" "$rgbds"
  tar -xzf "$cache/rgbds-$RGBDS.tar.gz" -C "$rgbds.src" --strip-components 1
  PATH="$bison/bin:$PATH" make -C "$rgbds.src" -j8 WARNFLAGS=-w rgbasm rgblink rgbfix >/dev/null
  cp "$rgbds.src/rgbasm" "$rgbds.src/rgblink" "$rgbds.src/rgbfix" "$rgbds/"
  rm -rf "$rgbds.src"
fi

rm -rf "$out" && mkdir -p "$out/tree"
tar -xzf "$cache/ReboundGB-$COMMIT.tar.gz" -C "$out/tree" --strip-components 1
patch -s -p1 -d "$out/tree" < "$here/rebound-gb/release-no-compo-logo.patch"
cd "$out/tree"
(cd Levels && for f in *.json; do python3 -I ../convertmap.py -c "$f" >/dev/null; done)
PATH="$rgbds:$PATH"
# O menu de depuracao embute __DATE__ e __TIME__; SOURCE_DATE_EPOCH fixo deixa a ROM reprodutivel.
export SOURCE_DATE_EPOCH=1635724800
rgbasm -o Rebound.obj -p 255 Main.asm -Wno-numeric-string -Wno-obsolete 2>/dev/null
rgblink -p 255 -o Rebound.gbc -n Rebound.sym Rebound.obj
rgbfix -v -p 255 Rebound.gbc
cp Rebound.gbc "$out/"
echo "$ROM_SHA256  $out/Rebound.gbc" | shasum -a 256 -c -