#!/usr/bin/env bash
# Fix 2: make bakinplayer.exe pass a real plugin path to the native engine.
#
# Yukar.Player.Program calls SharpKmy.Entry.initialize("", null), so pluginpath
# is NULL. The native scanPlugin then tries GetModuleFileNameW(NULL) to derive a
# search dir, which under Wine does not resolve to the on-disk data dir where the
# .dlp loaders live, so nothing is found. We rewrite the managed IL so the second
# argument becomes AppDomain.CurrentDomain.BaseDirectory (the folder containing
# bakinplayer.exe), which makes scanPlugin take its explicit-path branch.
#
# This is a pure IL rewrite done with Mono.Cecil (see Program.cs). It needs the
# .NET SDK (`dotnet`) available on PATH to build the tiny patcher. Reversible via
# the bakinplayer.exe.orig backup.
set -euo pipefail

GAME_ROOT="${1:?usage: apply.sh <game-root-dir>}"
HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
EXE="$GAME_ROOT/data/bakinplayer.exe"
KNOWN_ORIG_MD5="dc76b6ee233efaa1270d845b47fd4e3d"   # unpatched v1.1.0 (589,312 bytes)

[ -f "$EXE" ] || { echo "!! not found: $EXE"; exit 1; }
command -v dotnet >/dev/null || { echo "!! 'dotnet' (.NET SDK) not found on PATH, needed to build the IL patcher"; exit 2; }

md5now=$(md5sum "$EXE" | cut -d' ' -f1)
if [ "$md5now" != "$KNOWN_ORIG_MD5" ]; then
  echo "   (note: bakinplayer.exe md5 $md5now != known-original $KNOWN_ORIG_MD5)"
  echo "   If it was already patched by this tool, that is expected; continuing."
fi

echo "== Fix 2: building IL patcher (dotnet) ..."
dotnet build -c Release -o "$HERE/bin" "$HERE/patcher.csproj" >/dev/null

[ -f "$EXE.orig" ] || cp -n "$EXE" "$EXE.orig"
TMP="$(mktemp --suffix=.exe)"
if dotnet "$HERE/bin/patcher.dll" "$EXE.orig" "$TMP"; then
  cp "$TMP" "$EXE"; rm -f "$TMP"
  echo "== Fix 2: patched bakinplayer.exe (pluginpath=BaseDirectory), backup at bakinplayer.exe.orig"
else
  rm -f "$TMP"
  echo "!! Fix 2: patcher found no patch site; bakinplayer.exe may be a different build"; exit 4
fi