# FreeTable Frontend Nginx Configuration
# Serves Vue.js static build with SPA fallback

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
    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;

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

    # Gzip compression
    gzip on;
    gzip_vary on;
    gzip_proxied any;
    gzip_comp_level 6;
    gzip_types text/plain text/css text/xml application/json application/javascript 
               application/xml application/xml+rss text/javascript application/x-javascript;

    # 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;

    # Rate limiting zones
    limit_req_zone $binary_remote_addr zone=api:10m rate=10r/s;
    limit_req_zone $binary_remote_addr zone=static:10m rate=50r/s;

    # Upstream API backend
    upstream backend {
        server ${BACKEND_HOST}:${BACKEND_PORT};
        keepalive 32;
    }

    server {
        listen ${PORT};
        server_name _;
        root /usr/share/nginx/html;
        index index.html;

        # Security
        server_tokens off;

        # Health check endpoint (no caching)
        location = /health {
            access_log off;
            return 200 '{"status":"ok"}';
            add_header Content-Type application/json;
        }

        # API proxy to backend
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            
            proxy_pass http://backend;
            proxy_http_version 1.1;
            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_set_header Connection "";
            
            # Timeouts
            proxy_connect_timeout 30s;
            proxy_send_timeout 60s;
            proxy_read_timeout 60s;
            
            # Buffering
            proxy_buffering on;
            proxy_buffer_size 4k;
            proxy_buffers 8 4k;
        }

        # Static assets - long cache for hashed files
        location /assets/ {
            limit_req zone=static burst=100 nodelay;
            
            expires 1y;
            add_header Cache-Control "public, immutable";
            
            try_files $uri =404;
        }

        # SPA fallback - all other routes
        location / {
            try_files $uri $uri/ /index.html;
        }

        # Health check
        HEALTH_CHECK
    }
}