# Production Nginx Configuration
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 2048;
}

http {
    include /etc/nginx/mime.types;
    default_type application/octet-stream;

    log_format production '$remote_addr - $remote_user [$time_local] "$request" '
                          '$status $body_bytes_sent "$http_referer" '
                          '"$http_user_agent" "$http_x_forwarded_for" '
                          'rt=$request_time';

    access_log /var/log/nginx/access.log production;

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;

    # Gzip
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss;

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=50r/s;
    limit_req_zone $binary_remote_addr zone=auth:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=upload:10m rate=5r/s;
    limit_req_zone $binary_remote_addr zone=ws:10m rate=20r/s;

    # Maintenance mode flag
    map $http_x_maintenance_mode $maintenance_mode {
        default 0;
        "1" 1;
    }

    upstream backend {
        server backend:8080;
    }

    # HTTP -> HTTPS redirect (uncomment for production)
    # server {
    #     listen 80;
    #     server_name match.danyang.gov.cn;
    #     return 301 https://$server_name$request_uri;
    # }

    server {
        listen 443 ssl http2;
        server_name match.danyang.gov.cn;

        # SSL
        ssl_certificate /etc/nginx/certs/fullchain.pem;
        ssl_certificate_key /etc/nginx/certs/privkey.pem;
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers HIGH:!aNULL:!MD5;
        ssl_prefer_server_ciphers on;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 10m;

        # Security headers
        add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;
        add_header X-Frame-Options "DENY" always;
        add_header X-Content-Type-Options "nosniff" always;
        add_header X-XSS-Protection "1; mode=block" always;
        add_header Referrer-Policy "strict-origin-when-cross-origin" always;
        add_header Content-Security-Policy "default-src 'self'; script-src 'self' 'unsafe-inline'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; connect-src 'self' wss:;" always;

        # Maintenance mode
        location = /maintenance {
            return 503 '<h1>系统维护中</h1><p>请稍后再访问。</p>';
        }

        # Health checks (no auth needed)
        location = /api/v1/health/live {
            proxy_pass http://backend;
            proxy_set_header Host $host;
        }
        location = /api/v1/health/ready {
            proxy_pass http://backend;
            proxy_set_header Host $host;
        }
        location = /version {
            proxy_pass http://backend;
            proxy_set_header Host $host;
        }

        # Admin Web (SPA)
        location /admin/ {
            alias /usr/share/nginx/html/;
            try_files $uri $uri/ /admin/index.html;
        }

        # API proxy
        location /api/ {
            limit_req zone=api burst=100 nodelay;
            proxy_pass http://backend;
            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_connect_timeout 30s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
        }

        # WebSocket proxy
        location /ws/ {
            limit_req zone=ws burst=20 nodelay;
            proxy_pass http://backend;
            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_read_timeout 3600s;
        }

        # Auth endpoints (strict rate limiting)
        location ~* ^/api/v1/auth/ {
            limit_req zone=auth burst=5 nodelay;
            proxy_pass http://backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }

        # Upload endpoints
        location ~* ^/api/v1/photos/upload {
            limit_req zone=upload burst=5 nodelay;
            client_max_body_size 10M;
            proxy_pass http://backend;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
        }

        # MinIO public bucket (read-only)
        location /uploads/ {
            proxy_pass http://backend/;
            proxy_set_header Host $host;
            expires 7d;
            add_header Cache-Control "public, immutable";
        }
    }
}