# Multi-stage build per LLM Monitor

# Stage 1: Build CSS with Tailwind
FROM node:18-alpine AS css-builder

WORKDIR /app

# Copiare file di configurazione e lockfile per install consistente
COPY package.json package-lock.json tailwind.config.js ./

# Installare dipendenze Node
RUN npm ci

# Copiare input CSS e file usati dal content scan di Tailwind.
# Questo passaggio deve avvenire prima della build per invalidare cache quando cambiano template/js.
COPY app/web/static/css/input.css ./app/web/static/css/
COPY app/web/templates/ ./app/web/templates/
COPY app/web/static/js/ ./app/web/static/js/

# Compilare CSS Tailwind
RUN npm run tailwind:build

# Verifica bloccante: output.css deve essere compilato e non vuoto.
RUN test -s ./app/web/static/css/output.css && \
    CSS_LINES=$(wc -l < ./app/web/static/css/output.css) && \
    echo "[css-builder] output.css lines: ${CSS_LINES}" && \
    test "${CSS_LINES}" -ge 100

# Stage 2: Build Python packages
FROM python:3.11-slim AS builder

WORKDIR /app

# Installare dipendenze di build
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    && rm -rf /var/lib/apt/lists/*

# Copiare requirements
COPY requirements.txt .

# Installare Python packages in un virtualenv
RUN python -m venv /opt/venv
ENV PATH="/opt/venv/bin:$PATH"
RUN pip install --no-cache-dir --upgrade pip setuptools wheel && \
    pip install --no-cache-dir -r requirements.txt

# Stage 3: Runtime
FROM python:3.11-slim

WORKDIR /app

# Installare dipendenze di runtime
RUN apt-get update && apt-get install -y --no-install-recommends \
    curl \
    && rm -rf /var/lib/apt/lists/*

# Copiare il virtualenv dal builder
COPY --from=builder /opt/venv /opt/venv

# Copiare codice dell'app
COPY --from=css-builder /app/app/web/static/css/output.css ./app/web/static/css/output.css
COPY app/ /app/app/
COPY main.py /app/

# Impostare PATH
ENV PATH="/opt/venv/bin:$PATH"
ENV PYTHONUNBUFFERED=1

# Esporre la porta
EXPOSE 8000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:8000/api/v1/health || exit 1

# Comando di avvio
CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8000"]