#!/usr/bin/env bash
# Compila o Passage (Jason Rohrer, 2007, "Placed in the public domain" na pagina do autor) para
# WebAssembly a partir do Passage_v4_UnixSource.tar.gz do proprio autor, com o Emscripten 6.0.10
# (SDL 2 do Emscripten no lugar da SDL 1.2 do jogo; Asyncify para os lacos bloqueantes):
#
#   source <emsdk>/emsdk_env.sh      # emsdk install 6.0.10 && emsdk activate 6.0.10
#   src/FredGames.Bundler/Builds/build-passage.sh
#
# Mudancas no jogo (passage/browser.patch, publicado junto): o jogo dorme e espera tecla com chamadas
# que cedem a vez ao navegador (emscripten_sleep), Q/Esc nao encerram o programa e F (tela cheia) nao faz
# nada. As configuracoes (passage/settings/*.ini) pedem janela de 800x128 em vez de tela cheia 640x480.
#
# Saida: artifacts/build/passage-4/passage.{js,wasm,data}

set -euo pipefail

SHA256=c32fb893a5b91e7090237859367559e67c2fb394690c54723879cbd689227e0a
EMSCRIPTEN=6.0.10
URL="https://downloads.sourceforge.net/project/hcsoftware/Passage/v4/Passage_v4_UnixSource.tar.gz"

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/passage-4"
cache="$root/artifacts/build/cache"

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

mkdir -p "$cache"
tarball="$cache/Passage_v4_UnixSource.tar.gz"
[ -f "$tarball" ] || curl -fsSL "$URL" -o "$tarball"
echo "$SHA256  $tarball" | shasum -a 256 -c -

rm -rf "$out"
mkdir -p "$out/tree"
tar -xzf "$tarball" -C "$out/tree" --strip-components 1
patch -d "$out/tree" -p1 < "$here/passage/browser.patch"
cp "$here"/passage/settings/*.ini "$out/tree/gamma256/gameSource/settings/"

# O jogo inclui <SDL/SDL.h> (SDL 1.2); no Emscripten 6 essa pasta guarda os cabecalhos antigos do SDL
# do proprio Emscripten (teclas com outros valores), nao os da SDL 2.32 que e ligada. Estes encaminhadores
# apontam <SDL/...> para os cabecalhos certos (<SDL2/...>), e a pasta vai primeiro no caminho de inclusao.
mkdir -p "$out/shim/SDL"
for h in SDL SDL_audio SDL_main SDL_video; do
  printf '#include <SDL2/%s.h>\n' "$h" > "$out/shim/SDL/$h.h"
done
# SDL_DOUBLEBUF (flag da SDL 1.2) nao existe na SDL 2: o jogo so a testa em "flags" da nossa superficie, onde
# ela nunca esta ligada.
printf '#define SDL_DOUBLEBUF 0x40000000\n' >> "$out/shim/SDL/SDL.h"

cd "$out/tree/gamma256/gameSource"
MG=../../minorGems
em++ -O2 -w -sUSE_SDL=2 -sASYNCIFY -sALLOW_MEMORY_GROWTH=1 -sEXIT_RUNTIME=0 \
  -I"$out/shim" -I../.. \
  game.cpp landscape.cpp blowUp.cpp World.cpp map.cpp common.cpp score.cpp musicPlayer.cpp Timbre.cpp Envelope.cpp \
  $MG/io/file/linux/PathLinux.cpp $MG/util/stringUtils.cpp $MG/util/StringBufferOutputStream.cpp \
  $MG/util/SettingsManager.cpp $MG/system/unix/TimeUnix.cpp $MG/system/linux/ThreadLinux.cpp \
  $MG/crypto/hashes/sha1.cpp $MG/formats/encodingUtils.cpp \
  --preload-file graphics@/graphics --preload-file music@/music --preload-file settings@/settings \
  -o "$out/passage.js"
shasum -a 256 "$out/passage.js" "$out/passage.wasm" "$out/passage.data"