FROM python:3.11-slim

# =========================
# ENVIRONMENT SETTINGS
# =========================
ENV PYTHONDONTWRITEBYTECODE=1
ENV PYTHONUNBUFFERED=1
ENV PYTHONPATH=/app

# =========================
# WORKDIR
# =========================
WORKDIR /app

# =========================
# SYSTEM DEPENDENCIES
# =========================
RUN apt-get update && apt-get install -y \
    curl \
    git \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

# =========================
# PYTHON DEPENDENCIES (CACHED LAYER)
# =========================
COPY requirements.txt .

RUN pip install --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# =========================
# COPY SOURCE CODE
# =========================
COPY . .

# =========================
# SAFETY CHECK (optional but useful)
# Ensures templates exist at runtime
# =========================
RUN test -d /app/templates || mkdir -p /app/templates

# =========================
# PORT
# =========================
EXPOSE 7860

# =========================
# START APPLICATION
# IMPORTANT: MUST MATCH app.py (app = FastAPI())
# =========================
CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]