# Multi-stage Dockerfile for all Python microservices.
# Build args:
#   SERVICE_MODULE — Python module name under services/ (e.g. "news_fetcher")

# ---------------------------------------------------------------------------
# Stage 1: builder — install Python dependencies
# ---------------------------------------------------------------------------
FROM python:3.12-slim AS builder

WORKDIR /app

# Install uv for fast dependency resolution
RUN pip install uv

# Copy ONLY dependency metadata first — this layer is cached until
# pyproject.toml changes, so dependency install is skipped on pure code changes.
COPY pyproject.toml .

# Create minimal package stubs so uv can resolve the local editable install
# without copying all source (which would bust the cache on every commit).
RUN mkdir -p shared services backtester && \
    uv pip install --system --no-cache-dir ".[api,news,sentiment,trading,backtester]" && \
    uv pip install --system --no-cache-dir curl_cffi 2>/dev/null || true

# NOW copy the actual source code (changes here don't re-trigger dep install)
COPY shared/ shared/
COPY services/ services/
COPY backtester/ backtester/
COPY alembic/ alembic/
COPY alembic.ini .

# Re-install in-place so the package metadata points to actual source
RUN uv pip install --system --no-cache-dir --no-deps -e .

# ---------------------------------------------------------------------------
# Stage 2: slim runtime image
# ---------------------------------------------------------------------------
FROM python:3.12-slim

RUN apt-get update && apt-get install -y --no-install-recommends curl && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Copy installed packages and CLI entry-points from the builder
COPY --from=builder /usr/local/lib/python3.12/site-packages /usr/local/lib/python3.12/site-packages
COPY --from=builder /usr/local/bin /usr/local/bin

# Copy application source code
COPY --from=builder /app .

ARG SERVICE_MODULE="api_gateway"
ENV SERVICE_MODULE=${SERVICE_MODULE}
ARG HEALTH_PORT="9090"
ENV HEALTH_PORT=${HEALTH_PORT}

# Check /metrics endpoint (all services expose it via OpenTelemetry)
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD curl -sf http://localhost:${HEALTH_PORT}/metrics > /dev/null || exit 1

CMD python -m services.${SERVICE_MODULE}.main