user www-data;
worker_processes auto;
error_log /var/log/nginx/error.log warn;
pid /var/run/nginx.pid;

events {
    worker_connections 1024;
    use epoll;
    multi_accept on;
}

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

    # Logging format
    log_format main '$remote_addr - $remote_user [$time_local] "$request" '
                    '$status $body_bytes_sent "$http_referer" '
                    '"$http_user_agent" "$http_x_forwarded_for"';

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

    # Basic settings
    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 16M;

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types
        text/plain
        text/css
        text/xml
        text/javascript
        application/json
        application/javascript
        application/xml+rss
        application/atom+xml
        image/svg+xml;

    # Rate limiting
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=status:10m rate=1r/s;

    # Security headers
    add_header X-Frame-Options "SAMEORIGIN" 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' 'unsafe-eval'; style-src 'self' 'unsafe-inline'; img-src 'self' data: https:; font-src 'self' data:; connect-src 'self' wss: https:;" always;

    # SSL configuration
    ssl_protocols TLSv1.2 TLSv1.3;
    ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384;
    ssl_prefer_server_ciphers off;
    ssl_session_cache shared:SSL:10m;
    ssl_session_timeout 10m;

    # Upstream configurations
    upstream grafana_backend {
        server localhost:3000;
        keepalive 32;
    }

    upstream prometheus_backend {
        server localhost:9090;
        keepalive 32;
    }

    upstream uptime_kuma_backend {
        server localhost:3001;
        keepalive 32;
    }

    upstream alertmanager_backend {
        server localhost:9093;
        keepalive 32;
    }

    # Main server block
    # Redirect HTTP to HTTPS
    server {
        listen 80;
        server_name _;
        return 301 https://$host$request_uri;
    }

    server {
        listen 443 ssl http2;
        server_name _;

        # SSL configuration (self-signed certificate)
        ssl_certificate /etc/nginx/ssl/fullchain.pem;
        ssl_certificate_key /etc/nginx/ssl/privkey.pem;
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384;
        ssl_prefer_server_ciphers off;
        ssl_session_cache shared:SSL:10m;
        ssl_session_timeout 10m;

        # Security headers
        add_header X-Frame-Options "SAMEORIGIN" always;
        add_header X-Content-Type-Options "nosniff" always;

        # Root page - show simple status
        location = / {
            return 200 "Bot Infrastructure Status\n\nServices:\n- Grafana: /grafana/\n- Prometheus: /prometheus/\n- Uptime Kuma: /status/\n- Alertmanager: /alerts/\n";
            add_header Content-Type text/plain;
        }

        # Health check endpoint
        location /nginx-health {
            access_log off;
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }

        # Uptime Kuma status page
        location /status {
            # Rate limiting
            limit_req zone=status burst=5 nodelay;
            
            # Proxy to Uptime Kuma
            proxy_pass http://127.0.0.1:3001/;
            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;
            
            # WebSocket support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            
            # Timeouts
            proxy_connect_timeout 30s;
            proxy_send_timeout 30s;
            proxy_read_timeout 30s;
            
            # Buffer settings
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
        }

        # Uptime Kuma dashboard
        location /dashboard {
            # Rate limiting
            limit_req zone=status burst=5 nodelay;
            
            # Proxy to Uptime Kuma
            proxy_pass http://127.0.0.1:3001/dashboard;
            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;
            
            # WebSocket support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            
            # Timeouts
            proxy_connect_timeout 30s;
            proxy_send_timeout 30s;
            proxy_read_timeout 30s;
            
            # Buffer settings
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
        }

        # Uptime Kuma static assets
        location /assets/ {
            # Rate limiting
            limit_req zone=api burst=20 nodelay;
            
            # Proxy to Uptime Kuma
            proxy_pass http://127.0.0.1:3001;
            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;
            
            # Cache static assets
            expires 1y;
            add_header Cache-Control "public, immutable";
        }

        # Uptime Kuma icons and manifest
        location ~ ^/(icon.*\.(png|svg)|apple-touch-icon.*\.png|manifest\.json)$ {
            # Rate limiting
            limit_req zone=api burst=20 nodelay;
            
            # Proxy to Uptime Kuma
            proxy_pass http://127.0.0.1:3001;
            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;
            
            # Cache static assets
            expires 1y;
            add_header Cache-Control "public, immutable";
        }

        # Uptime Kuma WebSocket (Socket.IO)
        location /socket.io/ {
            # Rate limiting
            limit_req zone=api burst=20 nodelay;
            
            # Proxy to Uptime Kuma
            proxy_pass http://127.0.0.1:3001;
            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;
            
            # WebSocket support
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            
            # Timeouts
            proxy_connect_timeout 30s;
            proxy_send_timeout 30s;
            proxy_read_timeout 30s;
        }

        # Uptime Kuma API endpoints
        location /api/ {
            # Rate limiting
            limit_req zone=api burst=10 nodelay;
            
            # Proxy to Uptime Kuma
            proxy_pass http://127.0.0.1:3001;
            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;
            
            # CORS headers
            add_header Access-Control-Allow-Origin "*" always;
            add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
            add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization" always;
            
            # Handle preflight requests
            if ($request_method = 'OPTIONS') {
                add_header Access-Control-Allow-Origin "*";
                add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS";
                add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization";
                add_header Access-Control-Max-Age 1728000;
                add_header Content-Type "text/plain; charset=utf-8";
                add_header Content-Length 0;
                return 204;
            }
        }

        # Include other location configurations
        include /etc/nginx/conf.d/*.conf;
    }
}