worker_processes  auto;

events {
    worker_connections  1024;
}

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

    sendfile        on;
    keepalive_timeout  65;

    # Основні заголовки безпеки (мінімум)
    add_header X-Content-Type-Options nosniff;
    add_header X-Frame-Options DENY;
    add_header Referrer-Policy strict-origin-when-cross-origin;
    # HSTS для прод-сервера (коментуємо в локалі):
    # add_header Strict-Transport-Security "max-age=31536000; includeSubDomains" always;

    map $http_x_request_id $req_id {
        default $http_x_request_id;
        ""      $request_id;
    }

    log_format main '$remote_addr - $remote_user [$time_local] '
                    '"$request" $status $body_bytes_sent '
                    '"$http_referer" "$http_user_agent" "$req_id"';

    access_log /var/log/nginx/access.log main;
    error_log  /var/log/nginx/error.log warn;

    # ==========================================================================
    # UPSTREAMS
    # ==========================================================================

    upstream microdao_api {
        server microdao-api:8000;
    }

    upstream microdao_ws {
        server microdao-ws:8001;
    }

    upstream matrix_hs {
        server matrix-homeserver:8008;
    }

    upstream grafana_srv {
        server grafana:3000;
    }

    upstream prometheus_srv {
        server prometheus:9090;
    }

    upstream rag_srv {
        server rag-service:8081;
    }

    upstream notify_srv {
        server notification-service:8082;
    }

    # ==========================================================================
    # MAIN SERVER
    # ==========================================================================

    server {
        listen 80;
        server_name _;

        # Client settings
        client_max_body_size 100M;
        client_body_buffer_size 128k;

        # Timeouts
        proxy_connect_timeout 60s;
        proxy_send_timeout 60s;
        proxy_read_timeout 60s;

        # ======================================================================
        # HEALTHCHECK
        # ======================================================================

        location = /healthz {
            access_log off;
            return 200 'OK';
            add_header Content-Type text/plain;
        }

        # ======================================================================
        # MICRODAO API
        # ======================================================================

        location /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_set_header X-Request-Id $req_id;

            proxy_pass http://microdao_api/;
        }

        # ======================================================================
        # MICRODAO WEBSOCKET
        # ======================================================================

        location /ws/ {
            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 X-Request-Id $req_id;

            # WebSocket upgrade
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";

            # Extended timeout for WebSocket
            proxy_read_timeout 86400s;
            proxy_send_timeout 86400s;

            proxy_pass http://microdao_ws/;
        }

        # ======================================================================
        # MATRIX
        # ======================================================================

        location /matrix/ {
            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 X-Request-Id $req_id;

            # Remove /matrix/ prefix for Matrix API
            rewrite ^/matrix/(.*) /$1 break;
            proxy_pass http://matrix_hs;
        }

        # Matrix client API (without rewrite)
        location /_matrix {
            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 X-Request-Id $req_id;

            proxy_pass http://matrix_hs;
        }

        # ======================================================================
        # GRAFANA
        # ======================================================================

        location /grafana/ {
            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 X-Request-Id $req_id;

            proxy_pass http://grafana_srv/;
        }

        # Grafana WebSocket (Live)
        location /grafana/api/live/ {
            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";

            proxy_pass http://grafana_srv/api/live/;
        }

        # ======================================================================
        # PROMETHEUS
        # ======================================================================

        location /prometheus/ {
            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 X-Request-Id $req_id;

            proxy_pass http://prometheus_srv/;
        }

        # ======================================================================
        # RAG SERVICE
        # ======================================================================

        location /rag/ {
            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 X-Request-Id $req_id;

            proxy_pass http://rag_srv/;
        }

        # ======================================================================
        # NOTIFICATION SERVICE
        # ======================================================================

        location /notify/ {
            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 X-Request-Id $req_id;

            proxy_pass http://notify_srv/;
        }

        # ======================================================================
        # ERROR PAGES
        # ======================================================================

        error_page 502 503 504 /50x.html;
        location = /50x.html {
            root /usr/share/nginx/html;
        }
    }
}