#!/usr/bin/env bash
# Gera o neon-phase.love do Neon Phase (codigo de Eevee sob ISC; arte, sons e musica de Eevee e glitchedpuppet sob
# CC BY-SA 4.0; fonte m5x7 de Daniel Linssen, CC0) a partir do commit e86f765 do repositorio eevee/neon-phase
# (versao 1.2.1), com um patch nosso (publicado junto do fonte):
#   neon-phase/webgl-port.patch  tira a carga do vendor/gamecontrollerdb.txt (base de mapeamentos de controles do SDL,
#                                zlib, que nao vai no .love) e reescreve o shader do efeito de "glitch" em GLSL ES
#                                (uniforms float no lugar de int e mod() no lugar do while, que o WebGL 1 nao aceita).
# O .love e um zip deterministico (ordem alfabetica, data fixa, deflate) sem a pasta spec/ (testes), o README.md e o
# vendor/gamecontrollerdb.txt.
#
#   src/FredGames.Bundler/Builds/build-neon-phase.sh
#
# Saida: artifacts/build/neon-phase-e86f765/neon-phase.love

set -euo pipefail

COMMIT=e86f7654b04e3e7b2f450ea6a99c84a0c96d23a9
SHA256=03ffb5e0a4f842fbf806e90da953f988db290de85072270f8ecf479f7166a362

here="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
root="$(git -C "$here" rev-parse --show-toplevel 2>/dev/null || pwd)"
out="$root/artifacts/build/neon-phase-e86f765"
cache="$root/artifacts/build/cache"

mkdir -p "$cache"
tarball="$cache/neon-phase-e86f765.tar.gz"
[ -f "$tarball" ] || curl -fsSL "https://github.com/eevee/neon-phase/archive/$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/neon-phase/webgl-port.patch"

python3 -I - "$out/tree" "$out/neon-phase.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.startswith('spec/') or rel in ('README.md', 'vendor/gamecontrollerdb.txt') or rel.endswith('.orig'):
            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/neon-phase.love"