# Stage 1: Frontend Builder (Alpine-based)
FROM node:20-alpine AS frontend-builder

WORKDIR /app/frontend

# Copy package files and install dependencies
COPY frontend/package.json frontend/package-lock.json ./
COPY frontend/.npmrc ./

# Install all dependencies (needed for build)
RUN npm ci

# Copy source and build
COPY frontend/ ./
RUN npm run build && \
    # Remove source maps to save space
    find dist -name "*.map" -type f -delete && \
    # Remove node_modules after build
    rm -rf node_modules


# Stage 2: Python Dependencies (Slim-based)
FROM python:3.13-slim AS python-builder

WORKDIR /app

# Install uv for fast package management
COPY --from=ghcr.io/astral-sh/uv:latest /uv /usr/local/bin/uv

# Install build dependencies temporarily
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    g++ \
    && rm -rf /var/lib/apt/lists/*

# Copy pyproject.toml and install dependencies
COPY backend/pyproject.toml .

# Create virtual environment and install dependencies with uv
RUN uv venv /opt/venv && \
    . /opt/venv/bin/activate && \
    uv pip install -r pyproject.toml


# Stage 3: Final Runtime Image (Minimal)
FROM python:3.13-slim

# Install ONLY runtime dependencies (no build tools)
RUN apt-get update && apt-get install -y --no-install-recommends \
    # FFmpeg for audio processing
    ffmpeg \
    # Curl for health checks
    curl \
    # SQLite3 CLI for database maintenance
    sqlite3 \
    # Clean up
    && rm -rf /var/lib/apt/lists/* \
    && apt-get clean \
    && rm -rf /tmp/* /var/tmp/*

WORKDIR /app

# Copy Python virtual environment from builder
COPY --from=python-builder /opt/venv /opt/venv

# Copy backend code (only what's needed)
COPY backend/main.py ./backend/
COPY backend/alembic.ini ./backend/
COPY backend/alembic/ ./backend/alembic/
COPY backend/app/ ./backend/app/

# Copy startup scripts
COPY backend/run-migrations.sh backend/start.sh backend/enable-wal.sh ./backend/
RUN chmod +x ./backend/*.sh

# Copy frontend build from builder stage
COPY --from=frontend-builder /app/frontend/dist ./backend/static

# Create data directories
RUN mkdir -p /app/data/music \
    /app/data/uploads \
    /app/data/temp \
    /app/data/cache/artists \
    /app/data/cache/artist_images

# Environment variables
ENV PATH="/opt/venv/bin:$PATH" \
    PYTHONUNBUFFERED=1 \
    PYTHONPATH=/app/backend \
    PYTHONDONTWRITEBYTECODE=1 \
    MUSIC_DIR=/app/data/music \
    UPLOAD_DIR=/app/data/uploads \
    TEMP_DIR=/app/data/temp \
    BASE_DIR=/app

# Expose port
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/ || exit 1

# Set working directory to backend
WORKDIR /app/backend

# Run migrations and start the application
CMD ["/app/backend/start.sh"]