#!/bin/sh

set -eu

SCRIPT_DIR=$(CDPATH= cd -- "$(dirname "$0")" && pwd)
REPO_ROOT=$(CDPATH= cd -- "$SCRIPT_DIR/.." && pwd)

prefer_java_home() {
  if command -v /usr/libexec/java_home >/dev/null 2>&1; then
    /usr/libexec/java_home -v 17 2>/dev/null || true
  fi
}

prefer_homebrew_openjdk_17() {
  for candidate in \
    "/opt/homebrew/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home" \
    "/usr/local/opt/openjdk@17/libexec/openjdk.jdk/Contents/Home"
  do
    if [ -x "$candidate/bin/java" ]; then
      printf '%s\n' "$candidate"
      return 0
    fi
  done

  return 1
}

prefer_android_studio_jbr() {
  for candidate in \
    "/Applications/Android Studio.app/Contents/jbr/Contents/Home" \
    "/Applications/Android Studio Preview.app/Contents/jbr/Contents/Home"
  do
    if [ -x "$candidate/bin/java" ]; then
      printf '%s\n' "$candidate"
      return 0
    fi
  done

  return 1
}

java_major_version() {
  "$1/bin/java" -version 2>&1 | awk -F '"' '/version/ { split($2, v, "."); print v[1]; exit }'
}

SELECTED_JAVA_HOME=""

if [ -n "${JAVA_HOME:-}" ] && [ -x "${JAVA_HOME}/bin/java" ]; then
  CURRENT_MAJOR=$(java_major_version "$JAVA_HOME" || true)
  if [ "$CURRENT_MAJOR" = "17" ]; then
    SELECTED_JAVA_HOME="$JAVA_HOME"
  fi
fi

if [ -z "$SELECTED_JAVA_HOME" ]; then
  CANDIDATE=$(prefer_java_home)
  if [ -n "$CANDIDATE" ] && [ -x "$CANDIDATE/bin/java" ]; then
    SELECTED_JAVA_HOME="$CANDIDATE"
  fi
fi

if [ -z "$SELECTED_JAVA_HOME" ]; then
  CANDIDATE=$(prefer_homebrew_openjdk_17 || true)
  if [ -n "$CANDIDATE" ]; then
    SELECTED_JAVA_HOME="$CANDIDATE"
  fi
fi

if [ -z "$SELECTED_JAVA_HOME" ]; then
  CANDIDATE=$(prefer_android_studio_jbr || true)
  if [ -n "$CANDIDATE" ]; then
    SELECTED_JAVA_HOME="$CANDIDATE"
  fi
fi

if [ -z "$SELECTED_JAVA_HOME" ]; then
  cat >&2 <<'EOF'
Unable to find a Java 17 runtime for Android builds.

Install JDK 17 or Android Studio, then rerun the Android command.
You can also export JAVA_HOME to a Java 17 installation manually.
EOF
  exit 1
fi

export JAVA_HOME="$SELECTED_JAVA_HOME"
export PATH="$JAVA_HOME/bin:$PATH"

# Homebrew's standalone `libzip` can shadow the JDK's bundled zip native
# library on macOS, which breaks Gradle startup with Inflater.initIDs errors.
JAVA_DYLD_PATH="$JAVA_HOME/lib:$JAVA_HOME/lib/server"
if [ -n "${DYLD_LIBRARY_PATH:-}" ]; then
  export DYLD_LIBRARY_PATH="$JAVA_DYLD_PATH:$DYLD_LIBRARY_PATH"
else
  export DYLD_LIBRARY_PATH="$JAVA_DYLD_PATH"
fi

cd "$REPO_ROOT"
exec "$@"