# ==================================================
# MULTI-STAGE DOCKERFILE - WORKERS (PDF, Exercise, Notification)
# Node.js 20 LTS + TypeScript + Real Health Checks
# ==================================================

# --------------------------------------------------
# STAGE 1: Base Dependencies
# --------------------------------------------------
FROM node:20-alpine AS base
WORKDIR /app

# Install build dependencies
RUN apk add --no-cache \
    python3 \
    make \
    g++ \
    postgresql-client \
    poppler-utils \
    imagemagick \
    curl \
    openssl \
    openssl-dev \
    libc6-compat

# Copy package files
COPY backend/package*.json ./
COPY backend/prisma ./prisma/

# Install all dependencies
RUN npm ci && \
    npm cache clean --force

# --------------------------------------------------
# STAGE 2: Builder
# --------------------------------------------------
FROM node:20-alpine AS builder
WORKDIR /app

# Copy dependencies from base
COPY --from=base /app/node_modules ./node_modules
COPY backend/package*.json ./
COPY backend/tsconfig.json ./
COPY backend/src ./src
COPY backend/prisma ./prisma

# Build TypeScript
RUN npm run build

# --------------------------------------------------
# STAGE 3: PDF Worker
# --------------------------------------------------
FROM node:20-alpine AS pdf-worker
WORKDIR /app

# Install runtime dependencies for PDF processing
RUN apk add --no-cache \
    postgresql-client \
    poppler-utils \
    imagemagick \
    curl \
    wget \
    openssl \
    libc6-compat

# Create non-root user
RUN addgroup -g 1001 -S worker && \
    adduser -S worker -u 1001

# Copy built application and dependencies
COPY --from=base --chown=worker:worker /app/node_modules ./node_modules
COPY --from=builder --chown=worker:worker /app/dist ./dist
COPY --from=builder --chown=worker:worker /app/prisma ./prisma
COPY --from=base --chown=worker:worker /app/package*.json ./

# Create directories
RUN mkdir -p /app/pdfs /app/pdfs/processed /app/logs && \
    chown -R worker:worker /app

# Switch to non-root user
USER worker

# Set worker type
ENV WORKER_TYPE=pdf
ENV NODE_ENV=production
ENV HEALTH_PORT=3002

# Expose health check port
EXPOSE 3002

# Health check - Real HTTP endpoint check
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD wget --quiet --tries=1 --spider http://localhost:3002/health || exit 1

# Start PDF worker
CMD ["node", "dist/workers/runner.js"]

# --------------------------------------------------
# STAGE 4: Exercise Worker (AI)
# --------------------------------------------------
FROM node:20-alpine AS exercise-worker
WORKDIR /app

# Install runtime dependencies
RUN apk add --no-cache \
    postgresql-client \
    curl \
    wget \
    openssl \
    libc6-compat

# Create non-root user
RUN addgroup -g 1001 -S worker && \
    adduser -S worker -u 1001

# Copy built application and dependencies
COPY --from=base --chown=worker:worker /app/node_modules ./node_modules
COPY --from=builder --chown=worker:worker /app/dist ./dist
COPY --from=builder --chown=worker:worker /app/prisma ./prisma
COPY --from=base --chown=worker:worker /app/package*.json ./

# Create directories
RUN mkdir -p /app/logs && \
    chown -R worker:worker /app

# Switch to non-root user
USER worker

# Set worker type
ENV WORKER_TYPE=exercise
ENV NODE_ENV=production
ENV HEALTH_PORT=3003

# Expose health check port
EXPOSE 3003

# Health check - Real HTTP endpoint check
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD wget --quiet --tries=1 --spider http://localhost:3003/health || exit 1

# Start exercise worker
CMD ["node", "dist/workers/runner.js"]

# --------------------------------------------------
# STAGE 5: Notification Worker (Telegram)
# --------------------------------------------------
FROM node:20-alpine AS notification-worker
WORKDIR /app

# Install runtime dependencies
RUN apk add --no-cache \
    postgresql-client \
    curl \
    wget \
    openssl \
    libc6-compat

# Create non-root user
RUN addgroup -g 1001 -S worker && \
    adduser -S worker -u 1001

# Copy built application and dependencies
COPY --from=base --chown=worker:worker /app/node_modules ./node_modules
COPY --from=builder --chown=worker:worker /app/dist ./dist
COPY --from=builder --chown=worker:worker /app/prisma ./prisma
COPY --from=base --chown=worker:worker /app/package*.json ./

# Create directories
RUN mkdir -p /app/logs && \
    chown -R worker:worker /app

# Switch to non-root user
USER worker

# Set worker type
ENV WORKER_TYPE=notification
ENV NODE_ENV=production
ENV HEALTH_PORT=3004

# Expose health check port
EXPOSE 3004

# Health check - Real HTTP endpoint check
HEALTHCHECK --interval=30s --timeout=10s --start-period=30s --retries=3 \
    CMD wget --quiet --tries=1 --spider http://localhost:3004/health || exit 1

# Start notification worker
CMD ["node", "dist/workers/runner.js"]

# --------------------------------------------------
# METADATA
# --------------------------------------------------
LABEL maintainer="math-platform-builders"
LABEL description="Math Platform Workers (PDF, Exercise, Notification) - Production Ready"
LABEL version="1.0.0"