#!/usr/bin/env bash
# SCICRAFT — rebuild tdwcm with optional network channels.
#
# Why: THE Doctor Who Client Mod 0.2.1 registers all its payloads via
# PayloadRegistrar.playBidirectional WITHOUT .optional(), so clients carrying
# it are rejected by any server without the mod ("tdwcm:entity_rotation_sync +
# 30 more channels missing"). The mod is client-side-only in this pack, so we
# patch NetworkRegistry.register() to call registrar.optional() — absent
# payloads are then skipped in negotiation instead of failing login.
#
# Usage: tools/patches/build_patched_tdwcm.sh   (from repo root)
set -euo pipefail
cd "$(dirname "$0")"

TDWCM_URL="https://cdn.modrinth.com/data/96oAiXlp/versions/xpTvgljr/tdwcm-0.2.1.jar"
OUT_JAR="tdwcm-0.2.1-patched.jar"
WORK="$(mktemp -d)"
trap 'rm -rf "$WORK"' EXIT

echo "[patch] downloading original..."
curl -fsSL -o "$WORK/tdwcm.jar" "$TDWCM_URL"

if [ ! -f asm.jar ]; then
  echo "[patch] fetching ASM..."
  curl -fsSL -o asm.jar      https://repo1.maven.org/maven2/org/ow2/asm/asm/9.7.1/asm-9.7.1.jar
  curl -fsSL -o asm-tree.jar https://repo1.maven.org/maven2/org/ow2/asm/asm-tree/9.7.1/asm-tree-9.7.1.jar
fi

# Neoforge universal jar for COMPUTE_FRAMES hierarchy resolution
NFG="${NEOFORGE_UNIVERSAL:-$WORK/neoforge-universal.jar}"
if [ ! -f "$NFG" ]; then
  curl -fsSL -o "$WORK/neoforge-universal.jar" \
    https://maven.neoforged.net/releases/net/neoforged/neoforge/21.1.248/neoforge-21.1.248-universal.jar
  NFG="$WORK/neoforge-universal.jar"
fi

echo "[patch] compiling + running patcher..."
javac -cp asm.jar:asm-tree.jar TdwcmPatcher.java
unzip -q "$WORK/tdwcm.jar" "net/dumonde/tdwcm/networking/NetworkRegistry.class" -d "$WORK/x"
java -cp ".:asm.jar:asm-tree.jar:$WORK/tdwcm.jar:$NFG" TdwcmPatcher \
  "$WORK/x/net/dumonde/tdwcm/networking/NetworkRegistry.class" \
  "$WORK/NetworkRegistry.class"

echo "[patch] rebuilding jar..."
cp "$WORK/tdwcm.jar" "$OUT_JAR"
mkdir -p "$WORK/stage/net/dumonde/tdwcm/networking"
cp "$WORK/NetworkRegistry.class" "$WORK/stage/net/dumonde/tdwcm/networking/"
(cd "$WORK/stage" && jar uf "$OLDPWD/$OUT_JAR" net)

echo "[patch] verifying patched class inside jar..."
unzip -p "$OUT_JAR" net/dumonde/tdwcm/networking/NetworkRegistry.class > "$WORK/after.class"
cmp -s "$WORK/x/net/dumonde/tdwcm/networking/NetworkRegistry.class" "$WORK/after.class" \
  && { echo "[patch] ERROR: class unchanged"; exit 1; }
sha512sum "$OUT_JAR"
echo "[patch] done → $OUT_JAR"