# Production: port 80 (DigitalOcean droplet or any host) – timeouts prevent 504
# Set server_name to your droplet IP or domain, or leave _ for default.
server {
    listen 80 default_server;
    listen [::]:80 default_server;
    server_name _;

    client_max_body_size 100M;
    client_body_buffer_size 128k;

    location / {
        proxy_pass http://127.0.0.1:3000;
        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 Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_cache_bypass $http_upgrade;
        proxy_connect_timeout 120s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;
        add_header Access-Control-Allow-Origin * always;
        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS" always;
        add_header Access-Control-Allow-Headers "Authorization, Content-Type, Accept" always;
        if ($request_method = OPTIONS) {
            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 "Authorization, Content-Type, Accept" always;
            add_header Access-Control-Max-Age 3600;
            add_header Content-Type "text/plain charset=UTF-8";
            add_header Content-Length 0;
            return 204;
        }
    }

    location /api/ {
        rewrite ^/api/(.*) /$1 break;
        proxy_pass http://127.0.0.1:8001;
        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 $scheme;
        proxy_connect_timeout 120s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;
        add_header Access-Control-Allow-Origin * always;
        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS, PATCH" always;
        add_header Access-Control-Allow-Headers "Authorization, Content-Type, Accept, X-Requested-With" always;
        add_header Access-Control-Allow-Credentials true always;
        add_header Access-Control-Expose-Headers "Content-Length, Content-Range" always;
        if ($request_method = OPTIONS) {
            add_header Access-Control-Allow-Origin * always;
            add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS, PATCH" always;
            add_header Access-Control-Allow-Headers "Authorization, Content-Type, Accept, X-Requested-With" always;
            add_header Access-Control-Allow-Credentials true always;
            add_header Access-Control-Max-Age 3600;
            add_header Content-Type "text/plain charset=UTF-8";
            add_header Content-Length 0;
            return 204;
        }
        expires off;
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
    }
}

# Internal / alternate: port 7000 (e.g. 10.10.10.127:7000)
server {
    listen 7000;
    server_name 10.10.10.127;

    client_max_body_size 100M;
    client_body_buffer_size 128k;

    # Next.js frontend
    location / {
        proxy_pass http://127.0.0.1:3000;
        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 Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        proxy_cache_bypass $http_upgrade;

        # Avoid 504 Gateway Time-out on slow/cold Next.js (default is 60s)
        proxy_connect_timeout 120s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;

        # CORS headers for frontend
        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 "Authorization, Content-Type, Accept" always;
        
        # Handle preflight requests
        if ($request_method = OPTIONS) {
            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 "Authorization, Content-Type, Accept" always;
            add_header Access-Control-Max-Age 3600;
            add_header Content-Type "text/plain charset=UTF-8";
            add_header Content-Length 0;
            return 204;
        }
    }

    # FastAPI backend
    location /api/ {
        rewrite ^/api/(.*) /$1 break;
        proxy_pass http://127.0.0.1:8001;
        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;
        
        # CORS headers for API
        add_header Access-Control-Allow-Origin * always;
        add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS, PATCH" always;
        add_header Access-Control-Allow-Headers "Authorization, Content-Type, Accept, X-Requested-With" always;
        add_header Access-Control-Allow-Credentials true always;
        add_header Access-Control-Expose-Headers "Content-Length, Content-Range" always;
        
        # Handle preflight requests
        if ($request_method = OPTIONS) {
            add_header Access-Control-Allow-Origin * always;
            add_header Access-Control-Allow-Methods "GET, POST, PUT, DELETE, OPTIONS, PATCH" always;
            add_header Access-Control-Allow-Headers "Authorization, Content-Type, Accept, X-Requested-With" always;
            add_header Access-Control-Allow-Credentials true always;
            add_header Access-Control-Max-Age 3600;
            add_header Content-Type "text/plain charset=UTF-8";
            add_header Content-Length 0;
            return 204;
        }
        
        # Avoid 504 Gateway Time-out on slow DB/auth (default is 60s)
        proxy_connect_timeout 120s;
        proxy_send_timeout 300s;
        proxy_read_timeout 300s;
        
        # Disable caching for API responses
        expires off;
        add_header Cache-Control "no-cache, no-store, must-revalidate" always;
    }
}