#!/usr/bin/env bash
# Compila o Moon-Buggy 1.0.51 do fredygames.com (Jochen Voss, GNU GPL 2) em WebAssembly com o Emscripten
# 6.0.10, sobre a camada de terminal de curses-web/ (curses desenhado num canvas; ver curses-web/README.md).
#
#   source <emsdk>/emsdk_env.sh      # emsdk install 6.0.10 && emsdk activate 6.0.10
#   src/FredGames.Bundler/Builds/build-moon-buggy.sh
#
# Fonte: moon-buggy_1.0.51.orig.tar.gz do Debian, conferido pelo SHA-256 e guardado em
# artifacts/cache/moon-buggy/. moon-buggy/moon-buggy-fredygames.patch (so ativo no navegador): sem tty (o
# terminal nao e preparado) e a espera por tecla ou prazo (select no stdin) vira a espera da pagina
# (cw_wait_input). moon-buggy/config.h faz o papel do ./configure; SCORE_DIR=/moon-buggy-saves (a pagina guarda a
# pasta no IndexedDB). O copying.h e o buggy.h ja vem prontos no tarball.
#
# Saida: artifacts/build/moon-buggy-1.0.51/moon-buggy.{js,wasm}, que o bundle.yaml do jogo confere pelo SHA-256.
set -euo pipefail

VERSION=1.0.51
SRC_SHA256=352dc16ccae4c66f1e87ab071e6a4ebeb94ff4e4f744ce1b12a769d02fe5d23f
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/moon-buggy-$VERSION"
cache="$root/artifacts/cache/moon-buggy"
tarball="$cache/moon-buggy_$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/m/moon-buggy/moon-buggy_$VERSION.orig.tar.gz"
  mv "$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
patch -d "$S" -p1 --no-backup-if-mismatch < "$here/moon-buggy/moon-buggy-fredygames.patch" >&2
cp "$here/moon-buggy/config.h" "$S/config.h"

objs=()
for f in buggy main mode title pager game level ground laser meteor highscore realname queue vclock date persona \
  signal keyboard terminal cursor random error xmalloc xstrdup hpath; do
  o="$out/work/obj/$f.o"
  objs+=("$o")
  emcc "${CW_CFLAGS[@]}" -DHAVE_CONFIG_H -DSCORE_DIR='"/moon-buggy-saves"' -ffile-prefix-map="$out/work/=" -I"$S" -c "$S/$f.c" -o "$o"
done
for f in "$here/bsdgames/compat.c" "$CW_DIR/curses.c"; do
  o="$out/work/obj/$(basename "$f").o"
  objs+=("$o")
  emcc "${CW_CFLAGS[@]}" -ffile-prefix-map="$CW_DIR/=curses-web/" -ffile-prefix-map="$here/=" -c "$f" -o "$o"
done
emcc "${objs[@]}" -lm "${CW_LDFLAGS[@]}" -o "$out/moon-buggy.js"
rm -rf "$out/work"
shasum -a 256 "$out/moon-buggy.js" "$out/moon-buggy.wasm"