# Multi-stage build for Podcastic All-in-One Container
# Combines: Backend (Node.js), Frontend (React), Web Server (Nginx), Database (MongoDB), Cache (Redis)

# ==================== STAGE 1: Build Backend ====================
FROM node:20-alpine AS backend-builder

WORKDIR /build/backend

COPY backend/package*.json ./
RUN npm ci

COPY backend/tsconfig.json ./
COPY backend/src ./src

RUN npm run build

# ==================== STAGE 2: Build Frontend ====================
FROM node:20-alpine AS frontend-builder

WORKDIR /build/frontend

COPY frontend/package*.json ./
RUN npm ci

COPY frontend/tsconfig*.json ./
COPY frontend/vite.config.ts ./
COPY frontend/postcss.config.js ./
COPY frontend/tailwind.config.js ./
COPY frontend/index.html ./
COPY frontend/src ./src

RUN npm run build

# ==================== STAGE 3: Final Image ====================
FROM node:20-alpine

# Install supervisor to manage multiple processes, mongodb, redis, nginx
RUN apk add --no-cache supervisor nginx mongodb redis bash curl

WORKDIR /app

# ==================== Setup Backend ====================
COPY --from=backend-builder /build/backend/dist ./backend/dist
COPY --from=backend-builder /build/backend/package*.json ./backend/
RUN cd backend && npm ci --only=production

# ==================== Setup Frontend ====================
RUN mkdir -p /usr/share/nginx/html
COPY --from=frontend-builder /build/frontend/dist/* /usr/share/nginx/html/

# ==================== Setup Nginx ====================
RUN mkdir -p /etc/nginx/conf.d

COPY <<'EOF' /etc/nginx/conf.d/default.conf
server {
    listen 3579;
    server_name _;
    client_max_body_size 100M;

    # Frontend - Static files
    location / {
        root /usr/share/nginx/html;
        try_files $uri $uri/ /index.html;
        expires 1d;
        add_header Cache-Control "public, immutable";
    }

    # Static assets with long cache
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        root /usr/share/nginx/html;
        expires 1y;
        add_header Cache-Control "public, immutable";
    }

    # API - Proxy to backend
    location /api {
        proxy_pass http://127.0.0.1:5000;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection 'upgrade';
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_cache_bypass $http_upgrade;
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;
    }

    # Health check endpoint
    location /health {
        proxy_pass http://127.0.0.1:5000;
    }
}
EOF

# ==================== Setup Supervisor ====================
RUN mkdir -p /var/log/supervisor

COPY <<'EOF' /etc/supervisor/conf.d/supervisord.conf
[supervisord]
nodaemon=true
logfile=/var/log/supervisor/supervisord.log
pidfile=/var/run/supervisord.pid

[program:mongodb]
command=/usr/bin/mongod --dbpath /data/db --bind_ip 127.0.0.1
autostart=true
autorestart=true
stderr_logfile=/var/log/supervisor/mongodb.err.log
stdout_logfile=/var/log/supervisor/mongodb.out.log

[program:redis]
command=/usr/bin/redis-server --bind 127.0.0.1
autostart=true
autorestart=true
stderr_logfile=/var/log/supervisor/redis.err.log
stdout_logfile=/var/log/supervisor/redis.out.log

[program:backend]
command=/bin/bash -c "cd /app/backend && node dist/index.js"
environment=NODE_ENV=production,MONGODB_URI=mongodb://127.0.0.1:27017/podcastic,REDIS_URL=redis://127.0.0.1:6379
autostart=true
autorestart=true
stderr_logfile=/var/log/supervisor/backend.err.log
stdout_logfile=/var/log/supervisor/backend.out.log

[program:nginx]
command=/usr/sbin/nginx -g "daemon off;"
autostart=true
autorestart=true
stderr_logfile=/var/log/supervisor/nginx.err.log
stdout_logfile=/var/log/supervisor/nginx.out.log
EOF

# ==================== Create Data Directories ====================
RUN mkdir -p /data/db /data/redis

# ==================== Environment ====================
ENV NODE_ENV=production
ENV MONGODB_URI=mongodb://127.0.0.1:27017/podcastic
ENV REDIS_URL=redis://127.0.0.1:6379
ENV PORT=5000

# ==================== Health Check ====================
HEALTHCHECK --interval=30s --timeout=10s --start-period=40s --retries=3 \
  CMD curl -f http://127.0.0.1:3579/health || exit 1

# ==================== Expose Port ====================
EXPOSE 3579

# ==================== Entrypoint ====================
CMD ["/usr/bin/supervisord", "-c", "/etc/supervisor/conf.d/supervisord.conf"]