#!/usr/bin/env bash
# Gera o zero-velocity.love do Zero Velocity (Theogen Ratkin, GPL-3.0-or-later; arte CC BY-SA 4.0; musica CC BY 4.0)
# a partir do commit 142c2b8 do repositorio, com um patch nosso (publicado junto do fonte):
#   zero-velocity/web-compat.patch  tira o goto de drawCollision (funcao de depuracao; o love.js usa Lua 5.1,
#                                   que nao tem goto e recusa o arquivo inteiro) e desliga o fullscreen do conf.lua
#                                   (a pagina ja cuida do tamanho da janela; com fullscreen o jogo desenha em 800x600
#                                   no canto) e tira o item "Exit" do menu (love.event.quit congela a pagina).
# O jogo vive na pasta game/ do repositorio; o .love leva o conteudo dela mais LICENSE.txt, copyright e CREDITS.md
# (as licencas e os creditos do autor). Nada no jogo abre paginas, usa rede ou threads.
# O .love e um zip deterministico (ordem alfabetica, data fixa, deflate).
#
#   src/FredGames.Bundler/Builds/build-zero-velocity.sh
#
# Saida: artifacts/build/zero-velocity-142c2b8/zero-velocity.love

set -euo pipefail

COMMIT=142c2b80017f3aa6a1cd50029ce38b0f988da5e0
SHA256=8fd03fe26cfff7c6dddef1bc080df110c0852acc668ae6e7f36711d692e8427e

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/zero-velocity-142c2b8"
cache="$root/artifacts/build/cache"

mkdir -p "$cache"
tarball="$cache/zero-velocity-142c2b8.tar.gz"
[ -f "$tarball" ] || curl -fsSL "https://github.com/theoratkin/zero-velocity/archive/$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/zero-velocity/web-compat.patch"
mkdir -p "$out/game"
cp -R "$out/tree/game/." "$out/game/"
cp "$out/tree/LICENSE.txt" "$out/tree/copyright" "$out/tree/CREDITS.md" "$out/game/"

python3 -I - "$out/game" "$out/zero-velocity.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, '/')
        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/zero-velocity.love"