import { useEffect, useMemo, useRef, useState } from 'react';
import { 
  IconX, 
  IconPlayerPlay, 
  IconPlayerPause, 
  IconPlugConnected, 
  IconCopy, 
  IconTrash, 
  IconClock 
} from '@tabler/icons-react';

/**
 * WsUpdateModal - модальное окно с логами WebSocket
 * Простой подход со встроенным backdrop (как в HistoryModal)
 */
function WsUpdateModal({ show, url, onClose }) {
  const [rawMessages, setRawMessages] = useState([]);
  const [status, setStatus] = useState('connecting');
  const wsRef = useRef(null);
  const bottomRef = useRef(null);
  const [autoScroll, setAutoScroll] = useState(true);
  const [startedAt, setStartedAt] = useState(null);

  useEffect(() => {
    if (!show) return;
    
    try {
      const ws = new WebSocket(url);
      wsRef.current = ws;
      setStatus('connecting');
      
      ws.onopen = () => setStatus('open');
      
      ws.onmessage = (evt) => {
        const text = typeof evt.data === 'string' ? evt.data : '';
        let parsed = null;
        let jsonStart = text.indexOf('{');
        
        if (jsonStart >= 0) {
          const candidate = text.slice(jsonStart).trim();
          try {
            parsed = JSON.parse(candidate);
          } catch {
            parsed = null;
          }
        }

        if (parsed) {
          if (parsed.event === 'start' && parsed.ts) {
            setStartedAt(new Date(parsed.ts));
            return;
          }
          if (typeof parsed.line === 'string' && parsed.line.trim().length > 0) {
            setRawMessages((prev) => [...prev, { text: parsed.line, json: parsed }]);
            return;
          }
          return;
        }

        const clean = text.startsWith('$ ') ? text.slice(2) : text;
        if (clean.trim().length === 0) return;
        setRawMessages((prev) => [...prev, { text: clean, json: null }]);
      };
      
      ws.onerror = () => setStatus('error');
      ws.onclose = () => setStatus('closed');
    } catch (_e) {
      setStatus('error');
    }
    
    return () => {
      try { wsRef.current?.close(); } catch { /* no-op */ }
      wsRef.current = null;
    };
  }, [show, url]);

  useEffect(() => {
    if (autoScroll) {
      bottomRef.current?.scrollIntoView({ behavior: 'smooth' });
    }
  }, [rawMessages, autoScroll]);

  const plainLog = useMemo(
    () => rawMessages.map(m => (typeof m.text === 'string' ? m.text : '')).join('\n'), 
    [rawMessages]
  );

  const elapsedMs = useMemo(() => {
    if (!startedAt || rawMessages.length === 0) return null;
    const lastTs = Date.now();
    return lastTs - startedAt.getTime();
  }, [startedAt, rawMessages]);

  if (!show) return null;

  const copyLog = async () => {
    try {
      await navigator.clipboard.writeText(plainLog);
    } catch { /* no-op */ }
  };

  const clearLog = () => {
    setRawMessages([]);
  };

  const getStatusBadge = () => {
    const variants = {
      open: 'bg-green-lt text-green',
      connecting: 'bg-orange-lt text-orange',
      error: 'bg-red-lt text-red',
      closed: 'bg-secondary-lt text-secondary'
    };
    return (
      <span className={`badge ${variants[status] || variants.closed}`}>
        {status}
      </span>
    );
  };

  const handleBackdropClick = (e) => {
    if (e.target === e.currentTarget) {
      onClose?.();
    }
  };

  return (
    <>
      {/* Modal Backdrop */}
      <div className="modal-backdrop show" onClick={handleBackdropClick} />
      
      {/* Modal */}
      <div 
        className="modal show d-block" 
        role="dialog" 
        aria-modal="true"
        tabIndex={-1}
        onKeyDown={(e) => { if (e.key === 'Escape') onClose?.(); }}
      >
        <div className="modal-dialog modal-lg modal-dialog-centered" role="document">
          <div className="modal-content" tabIndex={-1}>
            <div className="modal-header">
              <h5 className="modal-title d-flex align-items-center">
                <IconPlugConnected className="me-2" size={24} />
                Логи запуска
                {getStatusBadge()}
              </h5>
              <button type="button" className="btn-close" onClick={onClose} aria-label="Закрыть" />
            </div>
          
          <div className="modal-body">
            {/* Controls */}
            <div className="d-flex gap-2 mb-3">
              <button 
                className="btn btn-outline-secondary btn-sm" 
                onClick={() => setAutoScroll(!autoScroll)}
                title={autoScroll ? 'Отключить автопрокрутку' : 'Включить автопрокрутку'}
              >
                {autoScroll ? <IconPlayerPause size={16} /> : <IconPlayerPlay size={16} />}
                <span className="ms-1">Автопрокрутка</span>
              </button>
              <button 
                className="btn btn-outline-primary btn-sm" 
                onClick={copyLog}
                title="Скопировать лог"
              >
                <IconCopy size={16} />
                <span className="ms-1">Копировать</span>
              </button>
              <button 
                className="btn btn-outline-danger btn-sm" 
                onClick={clearLog}
                title="Очистить лог"
              >
                <IconTrash size={16} />
                <span className="ms-1">Очистить</span>
              </button>
            </div>

            {/* Log output */}
            <div 
              className="bg-dark text-light p-3 rounded font-monospace"
              style={{ 
                maxHeight: '60vh', 
                overflowY: 'auto', 
                fontSize: '0.875rem', 
                border: '1px solid rgba(255,255,255,0.08)' 
              }}
            >
              {rawMessages.length === 0 ? (
                <div className="text-muted">Ожидание сообщений от сервера...</div>
              ) : (
                rawMessages.map((m, i) => {
                  const isErr = m?.json?.stream === 'stderr' || /\berror\b|\bошиб/i.test(String(m.text));
                  return (
                    <div key={i} className={`text-break ${isErr ? 'text-danger' : ''}`}>
                      <span className="text-secondary">$</span> {m.text}
                    </div>
                  );
                })
              )}
              <div ref={bottomRef} />
            </div>
          </div>
          
          <div className="modal-footer">
            <div className="d-flex justify-content-between align-items-center w-100">
              <div className="text-muted small d-flex align-items-center">
                <IconClock size={16} className="me-2" />
                <span>
                  Начало {startedAt ? startedAt.toLocaleTimeString() : '—'}
                  {elapsedMs != null && <> • Прошло {elapsedMs} ms</>}
                </span>
              </div>
              <button className="btn btn-secondary" onClick={onClose}>
                <IconX size={16} className="me-1" />
                Закрыть
              </button>
            </div>
          </div>
        </div>
      </div>
    </div>
    </>
  );
}

export default WsUpdateModal;