#!/usr/bin/env bash
# Compila o Assemblio (WASM-4, de Philipp Luhmann / quic5, GPL-3.0) a partir do fonte, no commit d1de94c (o
# HEAD, "Create LICENSE"; o codigo e o da jam de 2022). O autor nao publicou release, e o cartucho do
# wasm4.org nao serve (o arquivo de cartuchos de la e CC BY-NC-SA). Segue o bundle.sh do autor: o Zig da
# epoca (0.10.1, o build.zig usa a API std.build.Builder) em ReleaseSmall, depois o wasm-opt -Oz
# --strip-dwarf --strip-producers --zero-filled-memory (binaryen 101, o mesmo dos outros builds de
# WASM-4; o bundle.sh nao fixa versao). O executor do "zig build" do 0.10.1 nao linka mais no macOS atual
# (dyld_stub_binder), por isso o script chama o "zig build-lib" com as mesmas opcoes que o build.zig
# passa (biblioteca dinamica wasm32-freestanding, memoria importada de 64 KiB, global_base 6560, pilha de
# 8192 bytes, exportando start e update). Dois builds seguidos, em pastas diferentes, dao o mesmo sha256.
# Por ser GPL, o site hospeda junto o tarball do commit e este script.
#
#   src/FredGames.Bundler/Builds/build-assemblio.sh
#
# O Zig fica em artifacts/tools/zig-<versao>/ (baixado de ziglang.org se faltar) e o binaryen em
# artifacts/tools/binaryen-version_101/ (o build-2048.sh o instala).
#
# Saida: artifacts/build/assemblio/assemblio.wasm

set -euo pipefail

COMMIT=d1de94c299b99aea9ef40a209e3c8064b3e661e9
SHA256=de8386f44d4e49176b5adfe9c06cf9f02fc3f2a9ffe248783f9c43100cb5066e
CART_SHA256=d2cc2de2d6262a178b572631c1614b5abd70242433c9e4b70f6611806ba33b4d
ZIG=0.10.1
ZIG_SHA256=b9b00477ec5fa1f1b89f35a7d2a58688e019910ab80a65eac2a7417162737656
BINARYEN=version_101

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/assemblio"
cache="$root/artifacts/build/cache"
tools="$root/artifacts/tools"
wasm_opt="$tools/binaryen-$BINARYEN/bin/wasm-opt"

[ -x "$wasm_opt" ] || { echo "falta $wasm_opt (rode o build-2048.sh)" >&2; exit 1; }
mkdir -p "$cache"
fetch() { [ -f "$cache/$2" ] || curl -fsSL --retry 4 "$1" -o "$cache/$2"; echo "$3  $cache/$2" | shasum -a 256 -c -; }
fetch "https://github.com/luehmann/assemblio/archive/$COMMIT.tar.gz" "assemblio-${COMMIT:0:7}.tar.gz" "$SHA256"
if [ ! -x "$tools/zig-$ZIG/zig" ]; then
  fetch "https://ziglang.org/download/$ZIG/zig-macos-aarch64-$ZIG.tar.xz" "zig-macos-aarch64-$ZIG.tar.xz" "$ZIG_SHA256"
  tar -xJf "$cache/zig-macos-aarch64-$ZIG.tar.xz" -C "$tools"
  mv "$tools/zig-macos-aarch64-$ZIG" "$tools/zig-$ZIG"
fi

rm -rf "$out"
mkdir -p "$out/tree"
tar -xzf "$cache/assemblio-${COMMIT:0:7}.tar.gz" -C "$out/tree" --strip-components 1
(cd "$out/tree" && "$tools/zig-$ZIG/zig" build-lib src/main.zig -target wasm32-freestanding -O ReleaseSmall \
  -dynamic --import-memory --initial-memory=65536 --max-memory=65536 --global-base=6560 --stack 8192 \
  --export=start --export=update --name cart --global-cache-dir "$out/zig-global-cache" --cache-dir "$out/zig-cache")
"$wasm_opt" -Oz --strip-dwarf --strip-producers --zero-filled-memory -o "$out/assemblio.wasm" "$out/tree/cart.wasm"
rm -rf "$out/tree" "$out/zig-global-cache" "$out/zig-cache"
echo "$CART_SHA256  $out/assemblio.wasm" | shasum -a 256 -c -