events {
    worker_connections 1024;
}

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

    # 로그 포맷
    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;
    error_log /var/log/nginx/error.log warn;

    # Gzip 압축
    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=web:10m rate=30r/s;

    # Upstream for Stock Oracle API
    upstream stock_oracle_api {
        server api:8000;
    }

    # Upstream for Stock Oracle Frontend
    upstream stock_oracle_frontend {
        server frontend:3000;
    }

    # HTTP Server (redirect to HTTPS)
    server {
        listen 80;
        server_name localhost stock-oracle.local;
        
        # Health check endpoint
        location /health {
            access_log off;
            return 200 "healthy\n";
            add_header Content-Type text/plain;
        }

        # Redirect all HTTP to HTTPS
        location / {
            return 301 https://$server_name$request_uri;
        }
    }

    # HTTPS Server
    server {
        listen 443 ssl http2;
        server_name localhost stock-oracle.local;

        # SSL Configuration
        ssl_certificate /etc/nginx/ssl/cert.pem;
        ssl_certificate_key /etc/nginx/ssl/key.pem;
        ssl_session_timeout 1d;
        ssl_session_cache shared:SSL:50m;
        ssl_session_tickets off;

        # Modern configuration
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384;
        ssl_prefer_server_ciphers off;

        # HSTS
        add_header Strict-Transport-Security "max-age=63072000" always;

        # Frontend (React App)
        location / {
            limit_req zone=web burst=50 nodelay;
            
            proxy_pass http://stock_oracle_frontend;
            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 for Next.js hot reload (development only)
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection 'upgrade';
            proxy_cache_bypass $http_upgrade;
        }

        # API Endpoints
        location /api/ {
            limit_req zone=api burst=20 nodelay;
            
            proxy_pass http://stock_oracle_api;
            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 *;
            add_header Access-Control-Allow-Methods "GET, POST, OPTIONS";
            add_header Access-Control-Allow-Headers "DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization";
            
            # Handle preflight requests
            if ($request_method = 'OPTIONS') {
                add_header Access-Control-Allow-Origin *;
                add_header Access-Control-Allow-Methods "GET, POST, 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;
            }
        }

        # Direct API Documentation access
        location /docs {
            proxy_pass http://stock_oracle_api;
            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;
        }

        # Redoc Documentation
        location /redoc {
            proxy_pass http://stock_oracle_api;
            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;
        }

        # Frontend static assets with caching
        location /_next/static/ {
            proxy_pass http://stock_oracle_frontend;
            expires 1y;
            add_header Cache-Control "public, immutable";
        }

        # Frontend images with caching
        location /images/ {
            proxy_pass http://stock_oracle_frontend;
            expires 1y;
            add_header Cache-Control "public, immutable";
        }

        # Frontend favicon
        location /favicon.ico {
            proxy_pass http://stock_oracle_frontend;
            expires 1y;
            add_header Cache-Control "public, immutable";
        }
    }
}