#!/usr/bin/env bash
# Build the native library for aarch64 Android and package it into an
# installable KernelSU/Magisk module zip.
#
# Requirements:
#   - rustup target aarch64-linux-android (already installed)
#   - cargo-ndk
#   - Android NDK at $ANDROID_NDK_HOME or auto-detected from $HOME/Android/Sdk/ndk/*
#   - zip

set -euo pipefail

PROJECT_DIR="$(cd "$(dirname "$0")" && pwd)"
cd "$PROJECT_DIR"

# Auto-detect NDK if ANDROID_NDK_HOME isn't set
if [ -z "${ANDROID_NDK_HOME:-}" ]; then
    ANDROID_NDK_HOME="$(find "$HOME/Android/Sdk/ndk" -maxdepth 1 -mindepth 1 -type d 2>/dev/null | sort -V | tail -1)"
fi
if [ -z "${ANDROID_NDK_HOME:-}" ] || [ ! -d "$ANDROID_NDK_HOME" ]; then
    echo "error: ANDROID_NDK_HOME not set and no NDK found under ~/Android/Sdk/ndk" >&2
    exit 1
fi
echo "Using NDK: $ANDROID_NDK_HOME"
export ANDROID_NDK_HOME

# Build the cdylib for arm64-v8a
cargo ndk -t arm64-v8a build --release

SO_SRC="target/aarch64-linux-android/release/libvpnhide_zygisk.so"
if [ ! -f "$SO_SRC" ]; then
    echo "error: expected $SO_SRC after cargo ndk build, not found" >&2
    exit 1
fi

# Assemble the module staging directory
STAGING="target/module-staging"
rm -rf "$STAGING"
cp -a module "$STAGING"
mkdir -p "$STAGING/zygisk"
cp "$SO_SRC" "$STAGING/zygisk/arm64-v8a.so"

# Zip it
OUT_ZIP="target/vpnhide-zygisk.zip"
rm -f "$OUT_ZIP"
(cd "$STAGING" && zip -qr "../../$OUT_ZIP" .)

echo
echo "Built: $OUT_ZIP"
ls -lh "$OUT_ZIP"