FROM --platform=$BUILDPLATFORM alpine:latest AS builder

# Add build arguments for platform
ARG TARGETPLATFORM
ARG BUILDPLATFORM

# Install build dependencies
RUN apk add --no-cache \
    build-base \
    cmake \
    git \
    musl-dev \
    curl \
    bash \
    musl \
    g++ \
    ninja \
    linux-headers

# Install cross-compilation tools for ARM64
RUN if [ "$TARGETPLATFORM" = "linux/arm64" ]; then \
    apk add --no-cache \
    crossbuild-essential-arm64 \
    gcc-aarch64-linux-gnu \
    g++-aarch64-linux-gnu; \
    fi

# Set working directory
WORKDIR /build

# Copy source files
COPY . .

# Configure and build
RUN mkdir -p build_static

# Set up cross-compilation environment for ARM64
RUN if [ "$TARGETPLATFORM" = "linux/arm64" ]; then \
    export CC=aarch64-linux-gnu-gcc \
    export CXX=aarch64-linux-gnu-g++ \
    export CMAKE_TOOLCHAIN_FILE=/build/toolchain.cmake; \
    fi

# Create toolchain file for ARM64
RUN if [ "$TARGETPLATFORM" = "linux/arm64" ]; then \
    echo "set(CMAKE_SYSTEM_NAME Linux)" > toolchain.cmake && \
    echo "set(CMAKE_SYSTEM_PROCESSOR aarch64)" >> toolchain.cmake && \
    echo "set(CMAKE_C_COMPILER aarch64-linux-gnu-gcc)" >> toolchain.cmake && \
    echo "set(CMAKE_CXX_COMPILER aarch64-linux-gnu-g++)" >> toolchain.cmake && \
    echo "set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)" >> toolchain.cmake && \
    echo "set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)" >> toolchain.cmake && \
    echo "set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)" >> toolchain.cmake; \
    fi

RUN cmake -G Ninja -B build_static -DCMAKE_BUILD_TYPE=Release \
    -DCMAKE_EXE_LINKER_FLAGS="-static" \
    -DCMAKE_FIND_LIBRARY_SUFFIXES=".a" \
    -DBUILD_SHARED_LIBS=OFF \
    ${CMAKE_TOOLCHAIN_FILE:+-DCMAKE_TOOLCHAIN_FILE=$CMAKE_TOOLCHAIN_FILE}

RUN cmake --build build_static

# Final stage that only contains the binary
FROM scratch AS dropshell
COPY --from=builder /build/build_static/dropshell /dropshell