# Multi-stage Dockerfile for Collector service
# Stages: base -> development, base -> production

# =============================================================================
# Base stage - common dependencies
# =============================================================================
FROM python:3.11-slim as base

WORKDIR /app

# Install system dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Install Python dependencies
COPY services/collector/requirements.txt /app/requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

# Copy shared code and proto
COPY shared /app/shared
COPY proto /app/proto

# Generate gRPC code from proto
RUN python -m grpc_tools.protoc \
    -I/app/proto \
    --python_out=/app/shared \
    --grpc_python_out=/app/shared \
    /app/proto/metrics.proto \
    && sed -i 's/^import metrics_pb2/from shared import metrics_pb2/' /app/shared/metrics_pb2_grpc.py

# Copy service code
COPY services/collector /app/services/collector

ENV PYTHONPATH=/app
ENV PYTHONUNBUFFERED=1

# =============================================================================
# Development stage - with hot reload
# =============================================================================
FROM base as development

RUN pip install --no-cache-dir watchfiles

CMD ["python", "-m", "watchfiles", "python services/collector/main.py", "/app/services/collector"]

# =============================================================================
# Production stage - optimized
# =============================================================================
FROM base as production

# Run as non-root user
RUN useradd --create-home --shell /bin/bash appuser
USER appuser

CMD ["python", "services/collector/main.py"]