#!/usr/bin/env bash
# Copyright (c) 2016-2024 The Hush developers
# Distributed under the GPLv3 software license, see the accompanying
# file COPYING or https://www.gnu.org/licenses/gpl-3.0.en.html

set -eu -o pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BUILD_TARGET_FILE="$SCRIPT_DIR/src/.build_target"

# Function to check and clean if target changed
check_and_clean_target() {
    local new_target="$1"
    local current_target=""
    
    if [[ -f "$BUILD_TARGET_FILE" ]]; then
        current_target=$(cat "$BUILD_TARGET_FILE")
    fi
    
    if [[ -n "$current_target" && "$current_target" != "$new_target" ]]; then
        echo "Build target changed from '$current_target' to '$new_target'"
        echo "Cleaning old build artifacts to prevent cross-compilation contamination..."
        cd "$SCRIPT_DIR"
        make distclean 2>/dev/null || true
        # Clean leveldb separately as it often causes issues
        if [[ -d src/leveldb ]]; then
            make -C src/leveldb clean 2>/dev/null || true
        fi
        echo "Clean complete."
    fi
    
    # Record the new target
    echo "$new_target" > "$BUILD_TARGET_FILE"
}

# Check for --win-release flag for cross-compilation
if [[ "${1:-}" == "--win-release" ]]; then
    check_and_clean_target "windows"
    shift
    ./util/build-win.sh "$@"
    exit $?
fi

# Check for --linux-release flag (builds inside Ubuntu 20.04 container for max compatibility)
if [[ "${1:-}" == "--linux-release" ]]; then
    check_and_clean_target "linux-docker"
    shift
    echo "Building Linux release inside Ubuntu 20.04 Docker container..."
    sudo docker build -t hush-builder -f Dockerfile.build .
    sudo docker run --rm -e HOST_UID=$(id -u) -e HOST_GID=$(id -g) -v "$SCRIPT_DIR:/hush3" hush-builder "$@"
    echo "Docker build complete. Release is in release-linux/"
    exit $?
fi

# run correct build script for detected OS
if [[ "$OSTYPE" == "linux-gnu"* ]]; then
    check_and_clean_target "linux"
    ./util/build.sh --disable-tests "$@"
elif [[ "$OSTYPE" == "darwin"* ]]; then
    check_and_clean_target "macos"
    ./util/build-mac.sh --disable-tests "$@"
elif [[ "$OSTYPE" == "msys"* ]]; then
    check_and_clean_target "windows"
    ./util/build-win.sh --disable-tests "$@"
#elif [[ "$OSTYPE" == "freebsd"* ]]; then
    # placeholder
else
    echo "Unable to detect your OS. What are you using?"
fi