# ===========================
# Stage 1: Build environment
# ===========================
FROM python:3.13-slim AS builder

ENV PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1

WORKDIR /app

# Install build dependencies
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential curl && \
    pip install --upgrade pip uv && \
    rm -rf /var/lib/apt/lists/*

# Copy requirement file first for better caching
COPY requirements.txt .

# ✅ Install dependencies
RUN pip install -r requirements.txt

# Copy source code
COPY . .

# ===========================
# Stage 2: Runtime environment
# ===========================
FROM python:3.13-slim

ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    APP_HOME=/app

WORKDIR $APP_HOME

# Install runtime dependency (curl for healthcheck)
RUN apt-get update && apt-get install -y --no-install-recommends curl && \
    rm -rf /var/lib/apt/lists/*

# ✅ Copy Python and pip-installed packages from builder
COPY --from=builder /usr/local/lib/python3.13 /usr/local/lib/python3.13
COPY --from=builder /usr/local/bin /usr/local/bin

# Copy application code
COPY . .

# Expose FastAPI port
EXPOSE 8000

# Healthcheck endpoint
HEALTHCHECK CMD curl --fail http://localhost:8000/health || exit 1

# ✅ Start FastAPI app
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]