#!/usr/bin/env bash
# Compila o Greed 4.5 do fredygames.com (Matthew T. Day, 1989; mantido por Eric S. Raymond; licenca BSD de 2
# clausulas) em WebAssembly com o Emscripten 6.0.10, sobre a camada de terminal de curses-web/ (curses
# desenhado num canvas, mais o termcap que o jogo usa para destacar a linha nova da tabela de recordes; ver
# curses-web/README.md). Nenhuma mudanca no codigo do jogo.
#
#   source <emsdk>/emsdk_env.sh      # emsdk install 6.0.10 && emsdk activate 6.0.10
#   src/FredGames.Bundler/Builds/build-greed.sh
#
# Fonte: greed_4.5.orig.tar.gz do Debian, conferido pelo SHA-256 e guardado em artifacts/cache/greed/. Os
# recordes ficam em /greed-saves/greed.hs (a pagina guarda a pasta no IndexedDB); bsdgames/compat.c da o nome
# do jogador ("player", no lugar do getpwuid).
#
# Saida: artifacts/build/greed-4.5/greed.{js,wasm}, que o bundle.yaml do jogo confere pelo SHA-256.
set -euo pipefail

VERSION=4.5
SRC_SHA256=17e57e27423a9b3380aeea4e780e4247d9a10c60351c7a8c710744dcf9133ea6
EMSCRIPTEN=6.0.10

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/greed-$VERSION"
cache="$root/artifacts/cache/greed"
tarball="$cache/greed_$VERSION.orig.tar.gz"
. "$here/curses-web/flags.sh"

if ! emcc --version 2>/dev/null | head -1 | grep -q " $EMSCRIPTEN "; then
  echo "Precisa do Emscripten $EMSCRIPTEN no PATH (source <emsdk>/emsdk_env.sh)." >&2
  exit 1
fi
if [ ! -f "$tarball" ]; then
  mkdir -p "$cache"
  curl -fsSL -o "$tarball.part" "https://deb.debian.org/debian/pool/main/g/greed/greed_$VERSION.orig.tar.gz"
  mv "$tarball.part" "$tarball"
fi
echo "$SRC_SHA256  $tarball" | shasum -a 256 -c - >&2

rm -rf "$out"
mkdir -p "$out/work/obj" "$out/work/src"
S="$out/work/src"
tar xzf "$tarball" -C "$S" --strip-components=1

objs=()
for f in "$S/greed.c" "$here/bsdgames/compat.c" "$CW_DIR/curses.c" "$CW_DIR/termcap.c"; do
  o="$out/work/obj/$(basename "$f").o"
  objs+=("$o")
  emcc "${CW_CFLAGS[@]}" -DSCOREFILE='"/greed-saves/greed.hs"' -DRELEASE="\"$VERSION\"" \
    -ffile-prefix-map="$out/work/=" -ffile-prefix-map="$CW_DIR/=curses-web/" -ffile-prefix-map="$here/=" \
    -I"$S" -c "$f" -o "$o"
done
emcc "${objs[@]}" "${CW_LDFLAGS[@]}" -o "$out/greed.js"
rm -rf "$out/work"
shasum -a 256 "$out/greed.js" "$out/greed.wasm"