#!/usr/bin/env bash
# Compila a Simon Tatham's Portable Puzzle Collection (MIT) para WebAssembly, a partir do snapshot
# oficial puzzles-20260923.616da16 (o tarball que o autor publica em
# https://www.chiark.greenend.org.uk/~sgtatham/puzzles/, commit 616da16 do git.tartarus.org), com o
# suporte a Emscripten do proprio projeto (cmake/platforms/emscripten.cmake + emcc.c, emccpre.js,
# emcclib.js), sem nenhuma mudanca no fonte. E o mesmo comando do Buildscr do autor
# ("emcmake cmake" + make), so que em Release e apenas com os quebra-cabecas publicados aqui.
#
#   source artifacts/tools/emsdk/emsdk_env.sh   # Emscripten 6.0.10
#   src/FredGames.Bundler/Builds/build-sgt-puzzles.sh
#
# Saida: artifacts/build/sgt-puzzles-20260923.616da16/<nome>.{js,wasm}, que os bundle.yaml das
# paginas sgt-<nome> conferem pelo SHA-256. Outra versao do Emscripten gera outros bytes.

set -euo pipefail

VERSION=20260923.616da16
SHA256=cc419c8060b4e22be398aa03e30651fbce146eee510645c303fb6f5f1b77b78e
EMSCRIPTEN=6.0.10
PUZZLES=(bridges dominosa fifteen galaxies keen lightup loopy mines net pattern rect signpost singles slant
  solo tents towers tracks unequal untangle)

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

if ! emcc --version 2>/dev/null | head -1 | grep -q " $EMSCRIPTEN "; then
  echo "Precisa do Emscripten $EMSCRIPTEN no PATH (source artifacts/tools/emsdk/emsdk_env.sh)." >&2
  exit 1
fi

mkdir -p "$cache"
[ -f "$cache/$tarball" ] || curl -fsSL --retry 6 --connect-timeout 60 --max-time 600 \
  "https://www.chiark.greenend.org.uk/~sgtatham/puzzles/$tarball" -o "$cache/$tarball"
echo "$SHA256  $cache/$tarball" | shasum -a 256 -c -

rm -rf "$out"
mkdir -p "$out/tree"
tar -xzf "$cache/$tarball" -C "$out/tree" --strip-components 1

# Sem o halibut no PATH o CMake so avisa e pula o manual (que este site nao serve).
(cd "$out/tree" && emcmake cmake -B build -DCMAKE_BUILD_TYPE=Release -DHALIBUT=HALIBUT-NOTFOUND \
  -DMIN_FIREFOX_VERSION=79 -DMIN_CHROME_VERSION=85 . >/dev/null)
make -C "$out/tree/build" -j"$(sysctl -n hw.ncpu 2>/dev/null || nproc)" "${PUZZLES[@]}" >/dev/null

for p in "${PUZZLES[@]}"; do
  cp "$out/tree/build/$p.js" "$out/tree/build/$p.wasm" "$out/"
done
rm -rf "$out/tree"
(cd "$out" && shasum -a 256 ./*.js ./*.wasm)