#!/usr/bin/env bash
# steam-sdk.sh — extract the one file the app needs from the Steamworks SDK, and stage the
# local-only app id.
#
# Why not unzip the whole SDK: it is ~24 MB of C++ headers, examples and tools we never build.
# The runtime dependency is exactly one native library, and the release tooling (ContentBuilder)
# is only needed on the machine that uploads a depot.
#
#   ./scripts/steam-sdk.sh ~/Downloads/steamworks_sdk_165.zip
#   ./scripts/steam-sdk.sh ~/Downloads/steamworks_sdk_165.zip --contentbuilder
#
# --contentbuilder also extracts sdk/tools/ContentBuilder into steam/contentbuilder/ — that is
# the release tooling (steamcmd + the app_build/depot vdf templates). It is a separate opt-in
# because it is only needed on the machine that uploads a depot, and it is ~12 MB of binaries.
#
# steam_api64.dll is Valve's redistributable — shipping it beside a Steam-published exe is
# permitted by the Steamworks terms. It is NOT committed: steam/ is gitignored, like ffmpeg/.

set -euo pipefail

ZIP="${1:-$HOME/Downloads/steamworks_sdk_165.zip}"
WANT_CONTENTBUILDER="${2:-}"
ROOT="$(cd "$(dirname "$0")/.." && pwd)"

[ -f "$ZIP" ] || { echo "❌ SDK zip not found: $ZIP" >&2; echo "   Download it from partner.steamgames.com/downloads/steamworks_sdk.zip while signed in." >&2; exit 1; }

mkdir -p "$ROOT/steam"

python3 - "$ZIP" "$ROOT" <<'PY'
import sys, zipfile, pathlib

zip_path, root = sys.argv[1], pathlib.Path(sys.argv[2])
want = "sdk/redistributable_bin/win64/steam_api64.dll"
dest = root / "steam" / "steam_api64.dll"

with zipfile.ZipFile(zip_path) as z:
    with z.open(want) as src, open(dest, "wb") as out:
        out.write(src.read())

print(f"✓ {dest.relative_to(root)} ({dest.stat().st_size // 1024} KB)")
PY

# steam_appid.txt is a LOCAL TESTING affordance: it lets SteamAPI.Init() resolve an app id
# without going through the Steam client. 480 is Valve's public Spacewar test app, so the app
# can be exercised before LlamaCasty has an app id of its own. It is Debug-only in the csproj
# and must never ship in a depot — Valve's guidance is to remove it from release builds.
printf '480\n' > "$ROOT/steam/steam_appid.txt"
echo "✓ steam/steam_appid.txt = 480 (Spacewar, local Debug testing only)"

if [ "$WANT_CONTENTBUILDER" = "--contentbuilder" ]; then
  python3 - "$ZIP" "$ROOT" <<'PY'
import sys, zipfile, pathlib

zip_path, root = sys.argv[1], pathlib.Path(sys.argv[2])
prefix = "sdk/tools/ContentBuilder/"
dest = root / "steam" / "contentbuilder"

count = 0
with zipfile.ZipFile(zip_path) as z:
    for name in z.namelist():
        if not name.startswith(prefix) or name.endswith("/"):
            continue
        target = dest / name[len(prefix):]
        target.parent.mkdir(parents=True, exist_ok=True)
        with z.open(name) as src, open(target, "wb") as out:
            out.write(src.read())
        count += 1

print(f"✓ steam/contentbuilder/ ({count} files)")
print("  Windows upload: steam/contentbuilder/builder/steamcmd.exe +login <user> +run_app_build <vdf>")
PY
fi

echo ""
echo "Next: configure the paid Steam App ID for IEntitlement (SteamApps.BIsSubscribedApp)."