# https://aws.amazon.com/blogs/aws/new-for-aws-lambda-container-image-support/
ARG FUNCTION_DIR="/app"
ARG RUNTIME_VERSION="3.9"
ARG DISTRO_VERSION="3.15"

# Stage 1 - bundle base image + runtime
# Grab a fresh copy of the image and install GCC
FROM python:${RUNTIME_VERSION}-alpine${DISTRO_VERSION} AS python-alpine
# Install GCC (Alpine uses musl but we compile and link dependencies with GCC)
RUN apk upgrade -U --available --no-cache && \
    apk add --no-cache \
    libstdc++


# Stage 2 - build function and dependencies
FROM python-alpine AS build-image
# Install aws-lambda-cpp build dependencies
RUN apk upgrade -U --available --no-cache && \
    apk add --no-cache \
    build-base \
    libtool \
    autoconf \
    automake \
    libexecinfo-dev \
    make \
    cmake \
    libcurl \
    libffi-dev \
    openssl-dev
    # cargo

# Include global args in this stage of the build
ARG FUNCTION_DIR
ARG RUNTIME_VERSION
# Create function directory
RUN mkdir -p ${FUNCTION_DIR}
# Copy handler function
COPY app/* ${FUNCTION_DIR}

# Install requirements
COPY requirements.txt requirements.txt
RUN export MAKEFLAGS="-j$(nproc)"; pip install -r requirements.txt --target ${FUNCTION_DIR}


# Stage 3 - final runtime image
# Grab a fresh copy of the Python image
FROM python-alpine as release
# Include global arg in this stage of the build
ARG FUNCTION_DIR
# Set working directory to function root directory
WORKDIR ${FUNCTION_DIR}
# Copy in the built dependencies
COPY --from=build-image ${FUNCTION_DIR} ${FUNCTION_DIR}

ENTRYPOINT [ "/usr/local/bin/python", "-m", "awslambdaric" ]
CMD [ "app.handler" ]


# Tests
FROM release as test
ARG FUNCTION_DIR

COPY test.py .
RUN ./test.py