# Dockerfile — Optimized for Layer Caching
FROM python:3.10-slim

WORKDIR /app

# Install system deps
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    cmake \
    git \
    wget \
    pkg-config \
    python3-dev \
    libopenblas-dev \
    liblapack-dev \
    libgomp1 \
    libffi-dev \
    libssl-dev \
    zlib1g-dev \
    && rm -rf /var/lib/apt/lists/*

# === OPTIMIZATION: Cache Dependencies ===
# Pehle sirf requirements copy karo
COPY requirements.txt .

# Upgrade pip and install Python deps
# Ye layer tab tak cache rahegi jab tak requirements.txt change nahi hoti
RUN pip install --upgrade pip setuptools wheel
RUN pip install --no-cache-dir -r requirements.txt

# === CODE COPY ===
# Ab baki ka code copy karo (Ye change hone par upar wala step repeat nahi hoga)
COPY . .

# Ensure models dir exists and is writable by UID 1000
RUN mkdir -p /app/models && chown -R 1000:1000 /app/models

# Create unprivileged user and switch
RUN useradd -m -u 1000 user || true
USER user
ENV HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH

EXPOSE 7860
CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]