# ============================================================
# Stage 1: Build React SPA
# ============================================================
FROM node:22-slim AS frontend-builder

WORKDIR /app/frontend

# Install dependencies first (layer cache optimization)
COPY frontend/package*.json ./
RUN npm ci

# Copy source and build
COPY frontend/ ./
RUN npm run build

# ============================================================
# Stage 2: Python runtime (serves API + built SPA)
# ============================================================
FROM python:3.12-slim AS runtime

WORKDIR /app

# Install Python dependencies
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy backend source
COPY backend/ ./backend/

# Copy built React SPA from frontend-builder stage
COPY --from=frontend-builder /app/frontend/dist ./static

# Create data directory structure
RUN mkdir -p /app/data/prompts /app/data/outputs /app/data/campaigns /app/data/config

# Expose port
EXPOSE 8000

# CRITICAL: --root-path /postgenerator is set HERE (Uvicorn), NOT in FastAPI() constructor
# This avoids the double-path bug (Pitfall #4)
CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "8000", "--root-path", "/postgenerator"]