FROM python:3.12-slim

ARG CONFIG=production

# Install TA-Lib C library early for better layer caching
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        gcc \
        g++ \
        make \
        wget \
        ca-certificates \
    && wget http://prdownloads.sourceforge.net/ta-lib/ta-lib-0.4.0-src.tar.gz \
    && tar -xzf ta-lib-0.4.0-src.tar.gz \
    && cd ta-lib/ \
    && ./configure --prefix=/usr \
    && make \
    && make install \
    && cd .. \
    && rm -rf ta-lib ta-lib-0.4.0-src.tar.gz \
    && apt-get purge -y --auto-remove gcc g++ make wget \
    && rm -rf /var/lib/apt/lists/*

# Install Python build dependencies early for better layer caching
RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        gcc \
        g++ \
        cargo \
        rustc

# Install compiled packages - separate layer so requirements.txt changes don't trigger recompilation
COPY backend/requirements-pre.txt /app/requirements-pre.txt
RUN --mount=type=cache,target=/root/.cache/pip \
    --mount=type=cache,target=/root/.cargo \
    pip install --no-cache-dir -r /app/requirements-pre.txt \
    && apt-get purge -y --auto-remove gcc g++ cargo rustc \
    && rm -rf /var/lib/apt/lists/* /root/.rustup /tmp/*

# Set working directory
WORKDIR /app

# Copy and install remaining requirements
COPY backend/requirements.txt /app/requirements.txt

# Install Python dependencies and clean up
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY backend/src /app/src
COPY backend/config*.yaml /tmp/
RUN if [ -f /tmp/config-${CONFIG}.yaml ]; then \
        cp /tmp/config-${CONFIG}.yaml /app/config.yaml; \
    else \
        cp /tmp/config.yaml /app/config.yaml; \
    fi && rm -rf /tmp/config*.yaml

# Add src to PYTHONPATH for correct module resolution
ENV PYTHONPATH=/app/src

# Expose port
EXPOSE 8000

# Run the application
CMD ["python", "-m", "uvicorn", "src.main:app", "--host", "0.0.0.0", "--port", "8000"]