events {
    worker_connections 1024;
}

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

    sendfile on;
    tcp_nopush on;
    tcp_nodelay on;
    keepalive_timeout 65;
    types_hash_max_size 2048;
    client_max_body_size 250M;  # Map uploads up to 200MB + overhead

    # Proxy buffer sizing — prevents JWT/large-header truncation on redirect
    proxy_buffer_size 128k;
    proxy_buffers 4 256k;
    proxy_busy_buffers_size 256k;

    # Gzip
    gzip on;
    gzip_types text/plain text/css application/json application/javascript text/xml;

    # Logging
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;

    # Rate limiting zones
    limit_req_zone $binary_remote_addr zone=auth:10m rate=5r/s;
    limit_req_zone $binary_remote_addr zone=api:10m rate=30r/s;

    # Upstream API
    upstream api {
        server api:3000;
    }

    # Main server — panel.corrosionmgmt.com
    server {
        listen 80;
        server_name panel.corrosionmgmt.com;

        # API proxy
        location /api/ {
            limit_req zone=api burst=50 nodelay;
            proxy_pass http://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;

            # WebSocket support for console streaming
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
        }

        # Auth endpoints — stricter rate limiting
        location /api/auth/ {
            limit_req zone=auth burst=10 nodelay;
            proxy_pass http://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 SPA
        location / {
            root /usr/share/nginx/html;
            try_files $uri $uri/ /index.html;

            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;
        }
    }

    # Marketing site — corrosionmgmt.com (bare domain)
    server {
        listen 80;
        server_name corrosionmgmt.com;

        # Early access signup API
        location /api/early-access/ {
            limit_req zone=api burst=10 nodelay;
            proxy_pass http://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;
        }

        # SPA
        location / {
            root /usr/share/nginx/html;
            try_files $uri $uri/ /index.html;

            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;
        }
    }

    # Wildcard server — *.corrosionmgmt.com (public server sites)
    server {
        listen 80;
        server_name *.corrosionmgmt.com;

        # Public API proxy (subset of endpoints)
        location /api/public/ {
            limit_req zone=api burst=50 nodelay;
            proxy_pass http://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;
        }

        # Store API proxy
        location /api/store/ {
            limit_req zone=api burst=20 nodelay;
            proxy_pass http://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;
        }

        # PayPal webhook
        location /api/store/webhook/ {
            proxy_pass http://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;
        }

        # Public site frontend
        location / {
            root /usr/share/nginx/html;
            try_files $uri $uri/ /index.html;

            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;
        }
    }

    # Status page — status.corrosionmgmt.com
    server {
        listen 80;
        server_name status.corrosionmgmt.com;

        location /api/public/ {
            proxy_pass http://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;
        }

        location / {
            root /usr/share/nginx/html;
            try_files $uri $uri/ /index.html;

            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;
        }
    }

    # Map file downloads — direct file serving with sendfile
    server {
        listen 80;
        server_name api.corrosionmgmt.com;

        location /maps/ {
            alias /data/maps/;
            sendfile on;
            tcp_nopush on;
            aio on;
        }

        location / {
            proxy_pass http://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;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
        }
    }
}