/**
 * LiveStrategyPanel
 *
 * 실시간 전략 체크 — 전역 설정 UI.
 * 관심종목(★) 등록 종목 전체가 체크 대상이며, 여기서 전략·실행 방식을 지정합니다.
 */
import React, { useState, useCallback } from 'react';
import { createPortal } from 'react-dom';
import type { Theme } from '../types';
import { useDraggablePanel } from '../hooks/useDraggablePanel';
import {
  saveLiveStrategySettings,
  type LiveStrategySettingsDto,
} from '../utils/backendApi';
import { getKoreanName } from '../utils/marketNameCache';

interface Strategy {
  id:   number;
  name: string;
}

interface LiveStrategyPanelProps {
  theme:      Theme;
  market:     string;
  strategies: Strategy[];
  settings:   LiveStrategySettingsDto;
  watchlistCount?:     number;
  monitoredMarkets?:   string[];
  onClearMarkers?: () => void;
  onClose?: () => void;
  onSettingsChange?: (settings: LiveStrategySettingsDto) => void;
}

const ACCENT = '#3f7ef5';
const ACCENT_GLOW = 'rgba(63,126,245,0.22)';

const CandleIcon: React.FC<{ color: string }> = ({ color }) => (
  <svg width="28" height="28" viewBox="0 0 28 28" fill="none" xmlns="http://www.w3.org/2000/svg">
    <rect x="6"  y="9"  width="5" height="12" rx="1" fill={color} opacity="0.9"/>
    <line x1="8.5"  y1="5"  x2="8.5"  y2="9"  stroke={color} strokeWidth="1.5"/>
    <line x1="8.5"  y1="21" x2="8.5"  y2="25" stroke={color} strokeWidth="1.5"/>
    <rect x="17" y="7"  width="5" height="9"  rx="1" fill="var(--down,#4dabf7)" opacity="0.8"/>
    <line x1="19.5" y1="4"  x2="19.5" y2="7"  stroke="var(--down,#4dabf7)" strokeWidth="1.5"/>
    <line x1="19.5" y1="16" x2="19.5" y2="20" stroke="var(--down,#4dabf7)" strokeWidth="1.5"/>
  </svg>
);

const LiveStrategyPanel: React.FC<LiveStrategyPanelProps> = ({
  theme, market, strategies, settings,
  watchlistCount = 0, monitoredMarkets = [],
  onClearMarkers, onClose, onSettingsChange,
}) => {
  const [saving, setSaving] = useState(false);

  const {
    panelRef,
    dragging,
    onHeaderPointerDown,
    headerTouchStyle,
    panelStyle,
    headerCursor,
  } = useDraggablePanel({
    centerOnMount: true,
    initialPosition: { x: 40, y: 40 },
  });

  const persist = useCallback(async (patch: Partial<LiveStrategySettingsDto>) => {
    const next: LiveStrategySettingsDto = { ...settings, ...patch, market };
    const prev = settings;
    onSettingsChange?.(next);
    setSaving(true);
    try {
      const saved = await saveLiveStrategySettings(next);
      if (saved) {
        onSettingsChange?.(saved);
        onClearMarkers?.();
      } else {
        onSettingsChange?.(prev);
        window.alert('실시간 전략 설정 저장에 실패했습니다. 네트워크·서버 상태를 확인해 주세요.');
      }
    } catch {
      onSettingsChange?.(prev);
      window.alert('실시간 전략 설정 저장 중 오류가 발생했습니다.');
    } finally {
      setSaving(false);
    }
  }, [settings, market, onClearMarkers, onSettingsChange]);

  const isOn      = settings.isLiveCheck;
  const execType  = settings.executionType;
  const stratId   = settings.strategyId;
  const monCount  = monitoredMarkets.length;
  const selectedStrategy = strategies.find(s => s.id === stratId);

  const strategyTimeframes = settings.strategyCandleTypes?.length
    ? settings.strategyCandleTypes.join(', ')
    : '1m';
  const execLabel = execType === 'REALTIME_TICK' ? '실시간 틱 (3초)' : '봉 마감 직후';
  const posModeLabel = (settings.positionMode ?? 'LONG_ONLY') === 'LONG_ONLY'
    ? '보유 자산 기준'
    : '순수 지표 기준';

  const panel = (
    <div className={`lsp-overlay lsp-overlay--${theme}`}>
      <div
        ref={panelRef}
        className="lsp-modal app-popup-shell"
        style={{
          ...panelStyle,
          zIndex: 10000,
          cursor: dragging ? 'grabbing' : undefined,
          '--lsp-accent': ACCENT,
          '--lsp-accent-glow': ACCENT_GLOW,
        } as React.CSSProperties}
        onMouseDown={e => e.stopPropagation()}
      >
        <div
          className="gc-popup-header lsp-header"
          onPointerDown={onHeaderPointerDown}
          style={{ cursor: headerCursor, ...headerTouchStyle }}
        >
          <div className="lsp-header-left">
            <span className="lsp-badge" style={{ background: ACCENT }}>LIVE</span>
            <span className="lsp-header-title">
              STRATEGY CHECK
              <span className="lsp-header-ko"> (실시간 전략 체크)</span>
            </span>
          </div>
          {saving && <span className="lsp-saving">저장 중…</span>}
          {onClose && (
            <button type="button" className="lsp-close" onClick={onClose} title="닫기">✕</button>
          )}
        </div>

        <div className="lsp-summary-section">
          <div className="lsp-summary-row">
            <span className="lsp-summary-label">관심 종목</span>
            <span className="lsp-summary-value">{watchlistCount}개</span>
          </div>
          <div className="lsp-summary-row">
            <span className="lsp-summary-label">체크 대상</span>
            <span className={`lsp-summary-value${monCount > 0 ? ' lsp-summary-value--active' : ''}`}>
              {monCount}개
            </span>
          </div>
          {isOn && stratId && watchlistCount > 0 && (
            <p className="lsp-summary-hint">
              ★ 관심종목으로 등록한 종목이 자동으로 전략 체크 대상입니다.
            </p>
          )}
        </div>

        {monCount > 0 && (
          <div className="lsp-info-card">
            <div className="lsp-info-icon">
              <CandleIcon color={ACCENT} />
            </div>
            <div className="lsp-info-body">
              <div className="lsp-info-row">
                <span className="lsp-info-label">모니터링</span>
                <span className="lsp-info-val lsp-monitor-chips">
                  {monitoredMarkets.slice(0, 8).map(m => (
                    <span key={m} className="lsp-monitor-chip" title={m}>
                      {getKoreanName(m)}
                    </span>
                  ))}
                  {monCount > 8 && <span className="lsp-monitor-chip">+{monCount - 8}</span>}
                </span>
              </div>
              {isOn && selectedStrategy && (
                <>
                  <div className="lsp-info-row">
                    <span className="lsp-info-label">적용 전략</span>
                    <span className="lsp-info-val">{selectedStrategy.name}</span>
                  </div>
                  <div className="lsp-info-row">
                    <span className="lsp-info-label">평가 분봉</span>
                    <span className="lsp-info-val" title="전략 편집기 START에서 설정">{strategyTimeframes}</span>
                  </div>
                </>
              )}
            </div>
          </div>
        )}

        <div className="lsp-body">
          <div className="lsp-field-row">
            <span className="lsp-field-label">실시간 체크</span>
            <label className="lsp-toggle">
              <input
                type="checkbox"
                checked={isOn}
                onChange={e => persist({ isLiveCheck: e.target.checked })}
              />
              <span className="lsp-toggle-slider" />
            </label>
          </div>

          <div className={`lsp-field-row${!isOn ? ' lsp-field-row--disabled' : ''}`}>
            <span className="lsp-field-label">전략 선택</span>
            <select
              className="lsp-select"
              disabled={!isOn}
              value={stratId ?? ''}
              onChange={e => persist({ strategyId: e.target.value ? Number(e.target.value) : null })}
            >
              <option value="">전략 선택…</option>
              {strategies.map(s => (
                <option key={s.id} value={s.id}>{s.name}</option>
              ))}
            </select>
          </div>


          <div className={`lsp-section${!isOn ? ' lsp-section--disabled' : ''}`}>
            <span className="lsp-section-label">실행 방식</span>
            <div className="lsp-option-group">
              <label className={`lsp-option${execType === 'CANDLE_CLOSE' ? ' lsp-option--active' : ''}`}>
                <input
                  type="radio"
                  name="execType"
                  value="CANDLE_CLOSE"
                  checked={execType === 'CANDLE_CLOSE'}
                  disabled={!isOn}
                  onChange={() => persist({ executionType: 'CANDLE_CLOSE' })}
                />
                <span className="lsp-option-text">
                  <span className="lsp-option-title">봉 마감 직후</span>
                  <span className="lsp-option-desc">완성된 캔들 기준으로 1회 판정</span>
                </span>
              </label>
              <label className={`lsp-option${execType === 'REALTIME_TICK' ? ' lsp-option--active' : ''}`}>
                <input
                  type="radio"
                  name="execType"
                  value="REALTIME_TICK"
                  checked={execType === 'REALTIME_TICK'}
                  disabled={!isOn}
                  onChange={() => persist({ executionType: 'REALTIME_TICK' })}
                />
                <span className="lsp-option-text">
                  <span className="lsp-option-title">실시간 틱 (3초)</span>
                  <span className="lsp-option-desc">진행 중인 캔들 기준, 3초 주기 판정</span>
                </span>
              </label>
            </div>
          </div>

          <div className={`lsp-section${!isOn ? ' lsp-section--disabled' : ''}`}>
            <span className="lsp-section-label">시그널 모드</span>
            <div className="lsp-option-group">
              <label className={`lsp-option${(settings.positionMode ?? 'LONG_ONLY') === 'LONG_ONLY' ? ' lsp-option--active' : ''}`}>
                <input
                  type="radio"
                  name="lsp-posMode"
                  value="LONG_ONLY"
                  checked={(settings.positionMode ?? 'LONG_ONLY') === 'LONG_ONLY'}
                  disabled={!isOn}
                  onChange={() => persist({ positionMode: 'LONG_ONLY' })}
                />
                <span className="lsp-option-text">
                  <span className="lsp-option-title">보유 자산 기준</span>
                  <span className="lsp-option-desc">매수 이력 있을 때만 매도 허용</span>
                </span>
              </label>
              <label className={`lsp-option${settings.positionMode === 'SIGNAL_ONLY' ? ' lsp-option--active' : ''}`}>
                <input
                  type="radio"
                  name="lsp-posMode"
                  value="SIGNAL_ONLY"
                  checked={settings.positionMode === 'SIGNAL_ONLY'}
                  disabled={!isOn}
                  onChange={() => persist({ positionMode: 'SIGNAL_ONLY' })}
                />
                <span className="lsp-option-text">
                  <span className="lsp-option-title">순수 지표 기준</span>
                  <span className="lsp-option-desc">포지션 무관, 지표 충족 시 즉시 매도</span>
                </span>
              </label>
            </div>
          </div>

          {isOn && !stratId && (
            <p className="lsp-hint">전략을 선택하면 관심 {watchlistCount}개 종목에 적용됩니다.</p>
          )}

          {isOn && (
            <div className="lsp-status-bar">
              <span className={`lsp-dot${isOn ? ' lsp-dot--on' : ''}`} />
              <span className="lsp-status-text">
                {stratId
                  ? `${selectedStrategy?.name ?? '전략'} · ${strategyTimeframes} · ${execLabel} · ${posModeLabel} · ${monCount}종목`
                  : '전략을 선택하세요'}
              </span>
            </div>
          )}

          <p className="lsp-disclaimer">
            ※ 실시간 체크 ON 시 관심종목(★) 전체에 선택한 전략이 적용됩니다.
          </p>
        </div>
      </div>
    </div>
  );

  if (typeof document === 'undefined') return null;
  return createPortal(panel, document.body);
};

export default LiveStrategyPanel;
