FROM python:3.11-slim

# Set working directory
WORKDIR /app

# Install system dependencies
# fonts-noto-extra provides NotoSansDevanagari as fallback if Kalimati download fails
RUN apt-get update && apt-get install -y \
    build-essential \
    curl \
    git \
    fontconfig \
    fonts-noto-extra \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first for better Docker layer caching
COPY requirements.txt .

# Install Python dependencies
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Copy all app files
COPY . .

# Download Kalimati font — using reliable GitHub raw URL
RUN mkdir -p /app/fonts && \
    curl -fL "https://github.com/mhnpd/nepali-font/raw/master/fonts/Kalimati.ttf" \
         -o /app/fonts/Kalimati.ttf && \
    echo "✅ Kalimati downloaded: $(wc -c < /app/fonts/Kalimati.ttf) bytes" || \
    echo "⚠️ Kalimati download failed — NotoSansDevanagari will be used as fallback"

# Register Kalimati font with system font cache
RUN if [ -f /app/fonts/Kalimati.ttf ]; then \
        mkdir -p /usr/local/share/fonts/nepali && \
        cp /app/fonts/Kalimati.ttf /usr/local/share/fonts/nepali/ && \
        fc-cache -fv && \
        echo "✅ Kalimati font registered with system"; \
    else \
        echo "⚠️ Skipping font registration — file not found"; \
    fi

# Set environment variables
ENV PYTHONPATH=/app:/app/src
ENV HF_HOME=/tmp/huggingface
ENV TRANSFORMERS_CACHE=/tmp/huggingface
ENV STREAMLIT_BROWSER_GATHER_USAGE_STATS=false
ENV STREAMLIT_SERVER_PORT=7860
ENV STREAMLIT_SERVER_ADDRESS=0.0.0.0
ENV STREAMLIT_SERVER_HEADLESS=true
ENV MPLCONFIGDIR=/tmp/matplotlib

# Create necessary temp directories
RUN mkdir -p /tmp/huggingface /tmp/matplotlib

# Expose the port HF Spaces expects
EXPOSE 7860

# Run the Streamlit app from src/ folder
CMD ["streamlit", "run", "src/streamlit_app.py", \
     "--server.port=7860", \
     "--server.address=0.0.0.0", \
     "--server.headless=true", \
     "--browser.gatherUsageStats=false"]