#!/usr/bin/env bash
set -e

echo "=== 🦀 Building Oxygen Rust Core for Android ==="

# Check if cargo-ndk is installed
if ! command -v cargo-ndk &> /dev/null; then
    echo "Installing cargo-ndk (Android build helper)..."
    cargo install cargo-ndk
fi

# Ensure Android targets are installed
echo "Adding Rust Android targets..."
rustup target add aarch64-linux-android armv7-linux-androideabi x86_64-linux-android

# Ensure NDK is set
if [ -z "$ANDROID_NDK_HOME" ]; then
    echo "⚠️ ANDROID_NDK_HOME is not set!"
    echo "Please set it to your NDK path, e.g.:"
    echo "export ANDROID_NDK_HOME=\$HOME/Android/Sdk/ndk/27.x.x.x"
    exit 1
fi

cd rust-core

echo "Building shared libraries using cargo-ndk..."
# Build for all common Android architectures and output to the JNI libs folder
cargo ndk -t armeabi-v7a -t arm64-v8a -t x86_64 -o ../app/src/main/jniLibs build --release

echo "Generating Kotlin bindings using uniffi-bindgen..."
# Use uniffi-bindgen to generate Kotlin files
cargo run --features=uniffi/cli --bin uniffi-bindgen generate \
    --library ../app/src/main/jniLibs/arm64-v8a/librust_core.so \
    --language kotlin \
    --out-dir ../app/src/main/java

echo "✅ Rust build complete! The JNI libraries and Kotlin bindings are ready."