#!/usr/bin/env bash
# Compila o Blobby Volley 2 do fredygames.com (GPL-2.0; Jonathan Sieber, Daniel Knobe, Sven Rech e Erik
# Schultheis na programacao, Silvio Mummert nos graficos) em WebAssembly, com o Emscripten 6.0.10, as
# portas SDL2 2.32.10 dele e o PhysFS 3.2.0 (zlib) compilado aqui. Este script, o patch e o gerador de
# sons (blobby-volley-2/) fazem parte do codigo-fonte publicado junto do jogo.
#
#   source <emsdk>/emsdk_env.sh      # emsdk install 6.0.10 && emsdk activate 6.0.10
#   src/FredGames.Bundler/Builds/build-blobby-volley-2.sh
#
# Fonte: o tarball do commit c28c5fa do github.com/danielknobe/blobbyvolley2, conferido pelo SHA-256 e
# guardado em artifacts/cache/blobby-volley/.
#
# blobby-volley-2/blobby-fredygames.patch:
#   - sem o jogo em rede (menu "online game" e "lan game") nem o botao que abre o site do jogo;
#   - CURRENT_NETWORK_LAG, que era definido nos estados de rede, vira uma variavel local.
# O RakNet entra so pelo BitStream (usado para gravar replays); servidor, lobby e HTTP ficam de fora.
# Os tres sons do jogo (bums, pfiff e chat) nao tem autor nem licenca no repositorio: sao trocados por
# sons gerados por blobby-volley-2/make-sounds.py (CC0). Os dados vao num blobby.data que o proprio
# Emscripten carrega (--preload-file) em /data; as configuracoes e replays ficam em
# /home/web_user/.local/share/blobby, que a pagina monta no IndexedDB.
#
# Saida: artifacts/build/blobby-volley-2-c28c5fa/blobby.{js,wasm,data}, que o bundle.yaml do jogo confere
# pelo SHA-256.

set -euo pipefail

COMMIT=c28c5fa87872b7592f34f5f86196e93d127b6cf9
SRC_SHA256=6613016b6a83e4006647d17ab997b3ee8e61ce8f41d67ec93e95d92bf4ae98ed
PHYSFS_SHA256=1991500eaeb8d5325e3a8361847ff3bf8e03ec89252b7915e1f25b3f8ab5d560
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/blobby-volley-2-${COMMIT:0:7}"
cache="$root/artifacts/cache/blobby-volley"

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

fetch() { # arquivo url sha256
  if [ ! -f "$cache/$1" ]; then
    mkdir -p "$cache"
    curl -fsSL -o "$cache/$1.part" "$2"
    mv "$cache/$1.part" "$cache/$1"
  fi
  echo "$3  $cache/$1" | shasum -a 256 -c - >&2
}
fetch blobby.tar.gz "https://github.com/danielknobe/blobbyvolley2/archive/$COMMIT.tar.gz" "$SRC_SHA256"
fetch physfs-3.2.0.tar.gz "https://github.com/icculus/physfs/archive/refs/tags/release-3.2.0.tar.gz" "$PHYSFS_SHA256"

rm -rf "$out"
mkdir -p "$out/work/obj"
tar xzf "$cache/blobby.tar.gz" -C "$out/work"
tar xzf "$cache/physfs-3.2.0.tar.gz" -C "$out/work"
G="$out/work/blobbyvolley2-$COMMIT"
P="$out/work/physfs-release-3.2.0"
patch -d "$G" -p1 --binary --no-backup-if-mismatch < "$here/blobby-volley-2/blobby-fredygames.patch" >&2
python3 -I "$here/blobby-volley-2/make-sounds.py" "$G/data/sounds"

PORTS=(-sUSE_SDL=2 -sUSE_BOOST_HEADERS=1)
COMMON=(-O2 -w -fexceptions -ffile-prefix-map="$out/work/=" "${PORTS[@]}")
NOARCH=(-DPHYSFS_SUPPORTS_DEFAULT=0 -DPHYSFS_SUPPORTS_ZIP=1)

objs=()
jobs=0
add() { # compilador arquivo flags...
  local cc="$1" f="$2" rel o
  shift 2
  rel="${f#"$out/work/"}"
  o="$out/work/obj/${rel//\//_}.o"
  objs+=("$o")
  "$cc" "${COMMON[@]}" "$@" -c "$f" -o "$o" &
  jobs=$((jobs + 1))
  if [ "$jobs" -ge 8 ]; then wait; jobs=0; fi
}

for f in physfs physfs_byteorder physfs_unicode physfs_platform_posix physfs_platform_unix \
         physfs_archiver_dir physfs_archiver_unpacked physfs_archiver_zip; do
  add emcc "$P/src/$f.c" "${NOARCH[@]}"
done
for f in "$G"/deps/lua/*.c; do
  case "$f" in */lua.c|*/luac.c|*/loslib.c) continue ;; esac
  add emcc "$f"
done
add em++ "$G/deps/tinyxml/tinyxml2.cpp"

INC=(-I"$G/src" -I"$G/deps/lua" -I"$G/deps/tinyxml" -I"$P/src" -std=c++14)
S="$G/src"
for f in base64 BlobbyDebug Clock DuelMatch FileRead FileSystem FileWrite File GameLogic GenericIO Color \
         NetworkMessage PhysicWorld SpeedController UserConfig PhysicState DuelMatchState GameLogicState \
         InputSource PlayerInput IScriptableComponent PlayerIdentity Blood TextManager IMGUI \
         InputManager LocalInputSource RenderManager RenderManagerSDL RenderManagerNull \
         ScriptedInputSource SoundManager BlobbyApp main \
         replays/ReplayRecorder replays/ReplaySavePoint replays/ReplayPlayer replays/ReplayLoader \
         state/State state/GameState state/LocalGameState state/OptionsState state/ReplayState \
         state/ReplaySelectionState \
         input_device/JoystickInput input_device/JoystickPool input_device/KeyboardInput \
         input_device/MouseInput input_device/TouchInput \
         raknet/BitStream raknet/NetworkTypes; do
  add em++ "$S/$f.cpp" "${INC[@]}"
done
wait
for o in "${objs[@]}"; do [ -f "$o" ] || { echo "Falhou: $o" >&2; exit 1; }; done

# Liga de dentro da pasta de saida, com caminhos relativos: o carregador do blobby.data guarda o nome
# que a pasta tem aqui.
mkdir -p "$out/data"
cp -R "$G/data/." "$out/data/"
rm -rf "$out/data/CMakeLists.txt" "$out/data/Icon.jpg"
(
  cd "$out"
  em++ -O2 -fexceptions ${LINK_EXTRA:-} "${objs[@]}" "${PORTS[@]}" -lidbfs.js -sASYNCIFY -sALLOW_MEMORY_GROWTH=1 \
    -sENVIRONMENT=web -sEXIT_RUNTIME=1 \
    -sEXPORTED_RUNTIME_METHODS=FS,ENV,addRunDependency,removeRunDependency \
    --preload-file data@/data \
    -o blobby.js
)
rm -rf "$out/data" "$out/work"

shasum -a 256 "$out/blobby.js" "$out/blobby.wasm" "$out/blobby.data"