#!/usr/bin/env bash
# Compila tres jogos de Game Boy Advance do repositorio do agb (agbrs/agb, MPL-2.0 no codigo; assets CC)
# num commit fixo: The Purple Night, The Hat Chooses the Wizard e Hyperspace Roll. As ROMs
# publicadas no itch.io sao de versoes antigas do agb sem fonte identificavel; estas saem do fonte que o
# site hospeda junto (tarball do commit + Cargo.lock de cada jogo + este script e o patch ao lado).
#
#   src/FredGames.Bundler/Builds/build-agb-games.sh
#
# O Rust fica em artifacts/tools/ (nightly com data fixa; o rustup e instalado ali se faltar). O
# Cargo.lock de cada jogo e versionado em Content/games/<slug>/Cargo.lock: se existir, o build usa
# --locked; se nao, gera um novo, que deve ser conferido e versionado.
#
# Saida: artifacts/build/agb-8d1b5bb/<jogo>.gba

set -euo pipefail

COMMIT=8d1b5bb9b957058c22c2fd9960f240eb4b6274f5
SHA256=c375fa9e7fbed64339371ff78913c869e945e9cf38cb4845a039c24e04de8e5f
TOOLCHAIN=nightly-2026-09-26

# jogo (pasta em examples/) : nome interno do cabecalho (o mesmo do justfile do agb) : slug no site
GAMES=(
  "the-purple-night:PURPLENIGHT:the-purple-night"
  "the-hat-chooses-the-wizard:HATWIZARD:the-hat-chooses-the-wizard"
  "hyperspace-roll:HYPERSPACE:hyperspace-roll"
)

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
games="$root/src/FredGames.Web/Content/games"
out="$root/artifacts/build/agb-${COMMIT:0:7}"

export RUSTUP_HOME="$root/artifacts/tools/rustup"
export CARGO_HOME="$root/artifacts/tools/cargo"
export PATH="$CARGO_HOME/bin:$PATH"
if [ ! -x "$CARGO_HOME/bin/rustup" ]; then
  curl -sSf https://sh.rustup.rs | sh -s -- -y --no-modify-path --profile minimal --default-toolchain none
fi
rustup toolchain install "$TOOLCHAIN" --profile minimal --component rust-src >/dev/null
export RUSTUP_TOOLCHAIN="$TOOLCHAIN"

mkdir -p "$out/cache"
tarball="$out/cache/agb-${COMMIT:0:7}.tar.gz"
[ -f "$tarball" ] || curl -fsSL "https://github.com/agbrs/agb/archive/$COMMIT.tar.gz" -o "$tarball"
echo "$SHA256  $tarball" | shasum -a 256 -c -

rm -rf "$out/tree"
mkdir -p "$out/tree"
tar -xzf "$tarball" -C "$out/tree" --strip-components 1
# Unica mudanca no fonte, para o build ser reproduzivel: o conversor de imagens do agb iterava
# HashMap/HashSet (ordem aleatoria a cada compilacao) ao montar paletas, e a ROM mudava a cada build. O
# patch usa BTreeMap e ordena as cores de cada paleta; os jogos nao mudam.
patch -d "$out/tree" -p1 --quiet < "$here/agb-deterministic-images.patch"

export CARGO_TARGET_DIR="$out/target"
rm -rf "$CARGO_TARGET_DIR/thumbv4t-none-eabi"
# As flags do .cargo/config.toml dos exemplos (menos o -Tgba.ld, que o build.rs do agb ja passa ao
# linker), mais o remapeamento de caminhos (build reproduzivel).
remap="--remap-path-prefix=$out/tree=agb --remap-path-prefix=$CARGO_HOME=cargo --remap-path-prefix=$RUSTUP_HOME=rustup"
export CARGO_TARGET_THUMBV4T_NONE_EABI_RUSTFLAGS="-Ctarget-cpu=arm7tdmi -Cforce-frame-pointers=yes $remap"

(cd "$out/tree/agb-gbafix" && cargo build --release)

for entry in "${GAMES[@]}"; do
  IFS=: read -r game name slug <<<"$entry"
  dir="$out/tree/examples/$game"
  lock="$games/$slug/Cargo.lock"
  locked=()
  if [ -f "$lock" ]; then
    cp "$lock" "$dir/Cargo.lock"
    locked=(--locked)
  fi

  (cd "$dir" && cargo build --release --target thumbv4t-none-eabi ${locked[@]+"${locked[@]}"})
  "$CARGO_TARGET_DIR/release/agb-gbafix" --title "${name:0:12}" --gamecode "${name:0:4}" --makercode GC \
    "$CARGO_TARGET_DIR/thumbv4t-none-eabi/release/$game" -o "$out/$game.gba"
  cp "$dir/Cargo.lock" "$out/$game.Cargo.lock"
  [ -f "$lock" ] || echo "Cargo.lock novo para $slug: confira e copie $out/$game.Cargo.lock para $lock"
done

shasum -a 256 "$out"/*.gba