# Synor Explorer Web - Nginx Configuration
# Serves the React SPA and proxies API requests to the backend

server {
    listen 80;
    server_name _;

    root /usr/share/nginx/html;
    index index.html;

    # Gzip compression for better performance
    gzip on;
    gzip_vary on;
    gzip_min_length 1024;
    gzip_types text/plain text/css text/javascript application/javascript application/json image/svg+xml;

    # Security headers
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-XSS-Protection "1; mode=block" always;
    add_header Referrer-Policy "strict-origin-when-cross-origin" always;

    # Health check endpoint
    location /health {
        access_log off;
        return 200 'OK';
        add_header Content-Type text/plain;
    }

    # Proxy API requests to the explorer-api backend
    # The backend URL is configured via environment variable or defaults to explorer-api:3000
    location /api/ {
        proxy_pass http://explorer-api:3000/api/;
        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_connect_timeout 30s;
        proxy_send_timeout 30s;
        proxy_read_timeout 30s;
    }

    # Proxy WebSocket connections
    location /ws {
        proxy_pass http://explorer-api:3000/ws;
        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_read_timeout 86400;
    }

    # Cache static assets (JS, CSS, images)
    location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
        expires 1y;
        add_header Cache-Control "public, immutable";
        try_files $uri =404;
    }

    # Cache JSON assets (manifests, etc.)
    location ~* \.json$ {
        expires 1h;
        add_header Cache-Control "public";
        try_files $uri =404;
    }

    # SPA fallback - serve index.html for all unmatched routes
    # This enables client-side routing
    location / {
        try_files $uri $uri/ /index.html;
    }

    # Don't log favicon requests
    location = /favicon.ico {
        access_log off;
        log_not_found off;
    }

    # Don't log robots.txt requests
    location = /robots.txt {
        access_log off;
        log_not_found off;
    }
}