#!/bin/sh
# Installs Temurin JDK 25 and Ghidra into $1 (default /data/tools). Idempotent.
# On architectures without prebuilt decompiler binaries (e.g. ARM64) the
# native decompiler is built from the sources shipped with Ghidra.
set -eu
DEST="${1:-/data/tools}"
GHIDRA_URL="${GHIDRA_URL:-https://github.com/NationalSecurityAgency/ghidra/releases/download/Ghidra_12.2_build/ghidra_12.2_PUBLIC_20261016.zip}"
case "$(uname -m)" in
  x86_64) ARCH=x64 ;;
  aarch64|arm64) ARCH=aarch64 ;;
  *) echo "unsupported architecture $(uname -m)"; exit 1 ;;
esac
mkdir -p "$DEST"
cd "$DEST"
if ! jdk/bin/java -version 2>&1 | grep -q '"25'; then
  echo "Downloading JDK 25 ($ARCH)..."
  curl -fsSL "https://api.adoptium.net/v3/binary/latest/25/ga/linux/$ARCH/jdk/hotspot/normal/eclipse" -o jdk.tar.gz
  rm -rf jdk jdk.tmp && mkdir jdk.tmp && tar -xzf jdk.tar.gz -C jdk.tmp --strip-components=1 && mv jdk.tmp jdk && rm jdk.tar.gz
fi
if [ ! -x ghidra/support/analyzeHeadless ]; then
  echo "Downloading Ghidra..."
  curl -fsSL "$GHIDRA_URL" -o ghidra.zip
  rm -rf ghidra ghidra.tmp && mkdir ghidra.tmp && unzip -q ghidra.zip -d ghidra.tmp && mv ghidra.tmp/ghidra_* ghidra && rmdir ghidra.tmp && rm ghidra.zip
fi
# Use our JDK without asking.
sed -i "s#^JAVA_HOME_OVERRIDE=.*#JAVA_HOME_OVERRIDE=$DEST/jdk#" ghidra/support/launch.properties

# Native decompiler for this platform.
OSDIR=linux_x86_64
[ "$ARCH" = aarch64 ] && OSDIR=linux_arm_64
NATIVE="ghidra/Ghidra/Features/Decompiler/os/$OSDIR"
if [ ! -x "$NATIVE/decompile" ]; then
  echo "Building the native decompiler for $OSDIR (a few minutes)..."
  SRC="ghidra/Ghidra/Features/Decompiler/src/decompile/cpp"
  ( cd "$SRC" && mkdir -p ghi_opt sla_opt com_opt && make -j"$(nproc)" ARCH_TYPE= ghidra_opt sleigh_opt >/tmp/ghidra-native.log 2>&1 ) || { tail -20 /tmp/ghidra-native.log; exit 1; }
  mkdir -p "$NATIVE"
  cp "$SRC/ghidra_opt" "$NATIVE/decompile"
  cp "$SRC/sleigh_opt" "$NATIVE/sleigh"
  ( cd "$SRC" && make clean >/dev/null 2>&1 || true )
fi
"$DEST/jdk/bin/java" -version 2>&1 | head -1
echo "Ghidra installed in $DEST/ghidra ($OSDIR)"