#!/usr/bin/env bash
# Gera o mr-rescue.love do Mr. Rescue (Tangram Games; codigo zlib, arte/musica CC BY-SA 3.0) a partir do
# commit a5be73c do repositorio SimonLarsen/mrrescue, com duas mudancas nossas (publicadas junto do fonte):
#   mr-rescue/browser-main-loop.patch  o love.run do jogo e um "while true" que nunca devolve o controle; no
#                          navegador isso trava a aba. O patch o transforma na forma do LOVE 11 (devolve a funcao
#                          de um quadro, que o love.js chama a cada frame), com a mesma logica;
#   mr-rescue/tserial.lua  substitui o TSerial.lua, que nao traz nenhum texto de licenca no repositorio
#                          (o LICENSE do jogo diz que ele "nao e coberto"); a nossa e uma reescrita
#                          independente de 40 linhas, com a mesma interface (pack/unpack), em zlib.
# O .love e um zip deterministico (ordem alfabetica, data fixa, deflate) sem .git*, README.md e .gitignore.
#
#   src/FredGames.Bundler/Builds/build-mr-rescue.sh
#
# Saida: artifacts/build/mr-rescue-a5be73c/mr-rescue.love

set -euo pipefail

COMMIT=a5be73c60acb8d1be506f7b5e48e784492ba96ce
SHA256=2d739a277c6e34593e639e675eaa249c40bafd4214859f0d46033b8acfc21659

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/mr-rescue-a5be73c"
cache="$root/artifacts/build/cache"

mkdir -p "$cache"
tarball="$cache/mrrescue-a5be73c.tar.gz"
[ -f "$tarball" ] || curl -fsSL "https://github.com/SimonLarsen/mrrescue/archive/$COMMIT.tar.gz" -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/mr-rescue/browser-main-loop.patch"
cp "$here/mr-rescue/tserial.lua" "$out/tree/TSerial.lua"

python3 -I - "$out/tree" "$out/mr-rescue.love" <<'PY'
import os, sys, zipfile
src, dest = sys.argv[1:]
names = []
for base, dirs, files in os.walk(src):
    for f in files:
        rel = os.path.relpath(os.path.join(base, f), src).replace(os.sep, '/')
        if rel in ('README.md', '.gitignore') or rel.startswith('.git'):
            continue
        names.append(rel)
with zipfile.ZipFile(dest, 'w', zipfile.ZIP_DEFLATED, compresslevel=9) as z:
    for rel in sorted(names):
        info = zipfile.ZipInfo(rel, (1980, 1, 1, 0, 0, 0))
        info.compress_type = zipfile.ZIP_DEFLATED
        info.external_attr = 0o644 << 16
        info.create_system = 3
        with open(os.path.join(src, rel), 'rb') as fh:
            z.writestr(info, fh.read(), compresslevel=9)
PY
shasum -a 256 "$out/mr-rescue.love"