#!/usr/bin/env bash
# Monta o Factors Game (puzzle de matematica de Michael P. Nitowski, MIT; JavaScript puro, sem audio nem fontes) a partir do
# commit aba7558 de github.com/mnito/factors-game, com o factors-game-full.min.js que o autor traz no repositorio
# (o src/ e o mesmo codigo sem minificar, e o MIT nao exige o fonte, mas ele vai junto como "sources").
#
# Mudancas no jogo (factors-game/factors-game-fredygames.patch): sem as meta tags og:/twitter: (apontam para
# o GitHub Pages do autor), sem os links para o GitHub e o Twitter do autor (viram texto) e com uma CSP que
# bloqueia qualquer conexao externa.
#
#   src/FredGames.Bundler/Builds/build-factors-game.sh
#
# Saida: artifacts/build/factors-game-aba7558/{factors-game-aba7558-dist.tar.gz}; o
# tar.gz sai igual em dois builds seguidos.

set -euo pipefail

COMMIT=aba7558f6aab203a2cc991ac4ae6da2439ef9aaa
SHA256=817e4327574c762cb018ea7228c3b0956820c569539ed3bc58d0209ded1b6e46

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/factors-game-${COMMIT:0:7}"
cache="$root/artifacts/build/cache"

mkdir -p "$cache"
if [ ! -f "$cache/factors-game-${COMMIT:0:7}.tar.gz" ]; then
  curl -fsSL --retry 4 "https://github.com/mnito/factors-game/archive/$COMMIT.tar.gz" -o "$cache/factors-game-${COMMIT:0:7}.tar.gz.partial" \
    && mv "$cache/factors-game-${COMMIT:0:7}.tar.gz.partial" "$cache/factors-game-${COMMIT:0:7}.tar.gz"
fi
echo "$SHA256  $cache/factors-game-${COMMIT:0:7}.tar.gz" | shasum -a 256 -c -

rm -rf "$out"
mkdir -p "$out/tree" "$out/dist"
tar -xzf "$cache/factors-game-${COMMIT:0:7}.tar.gz" -C "$out/tree" --strip-components 1
patch -s -p1 -d "$out/tree" < "$here/factors-game/factors-game-fredygames.patch"
cp "$out/tree/index.html" "$out/tree/favicon.png" "$out/tree/factors-game-full.min.js" "$out/dist/"

# dist/ vira um tar.gz deterministico (datas fixas, ordem fixa, sem dono).
find "$out/dist" -exec touch -t 202109260000 {} +
( cd "$out" && find dist -type f | LC_ALL=C sort > files.txt \
  && COPYFILE_DISABLE=1 tar --format=ustar --uid 0 --gid 0 --uname root --gname root -n -cf - -T files.txt \
  | gzip -n -9 > "factors-game-${COMMIT:0:7}-dist.tar.gz" && rm files.txt )
rm -rf "$out/tree"
ls -l "$out/factors-game-${COMMIT:0:7}-dist.tar.gz"
shasum -a 256 "$out/factors-game-${COMMIT:0:7}-dist.tar.gz"