import React, { useMemo } from 'react';
import { useAppSettings } from '../../hooks/useAppSettings';
import { resetPaperAccount, type PaperAllocationDto } from '../../utils/backendApi';
import PaperSplitPanel from './PaperSplitPanel';
import PaperSymbolStageSettings from './PaperSymbolStageSettings';

interface Props {
  selectedMarket?: string;
  allocations?: PaperAllocationDto[];
  onSettingsSaved?: () => void;
  onAccountReset?: () => void;
  onOpenSettings?: () => void;
}

const SettingsFieldRow: React.FC<{ label: string; children: React.ReactNode }> = ({ label, children }) => (
  <div className="vtd-target-strategy-field">
    <span className="vtd-target-strategy-label">{label}</span>
    {children}
  </div>
);

const PaperLeftSettingsTab: React.FC<Props> = ({
  selectedMarket,
  allocations = [],
  onSettingsSaved,
  onAccountReset,
  onOpenSettings,
}) => {
  const { defaults, save, isLoaded } = useAppSettings();
  const selectedAlloc = useMemo(
    () => allocations.find(a => a.symbol === selectedMarket),
    [allocations, selectedMarket],
  );

  if (!isLoaded) {
    return <p className="ptd-muted">설정 로딩…</p>;
  }

  const patch = (p: Parameters<typeof save>[0]) => {
    save(p);
    onSettingsSaved?.();
  };

  const handleReset = async () => {
    if (!window.confirm('모의투자 계좌를 초기화합니다. 계속할까요?')) return;
    const res = await resetPaperAccount();
    if (res) onAccountReset?.();
  };

  const top = (
    <div className="ptd-settings-panel">
      {onOpenSettings && (
        <button type="button" className="bps-btn bps-btn--ghost ptd-settings-link" onClick={onOpenSettings}>
          설정 → 모의투자에서 전체 관리
        </button>
      )}
      <div className="vtd-target-item ptd-item-card ptd-settings-card">
        <div className="ptd-item-card-metrics">
          <SettingsFieldRow label="모의투자 활성화">
            <label className="vtd-trade-meta-value ptd-settings-value-box ptd-settings-value-box--check">
              <input
                type="checkbox"
                checked={defaults.paperTradingEnabled}
                onChange={e => patch({ paperTradingEnabled: e.target.checked })}
              />
            </label>
          </SettingsFieldRow>
          <SettingsFieldRow label="자동매매">
            <label className="vtd-trade-meta-value ptd-settings-value-box ptd-settings-value-box--check">
              <input
                type="checkbox"
                checked={defaults.paperAutoTradeEnabled}
                onChange={e => patch({ paperAutoTradeEnabled: e.target.checked })}
              />
            </label>
          </SettingsFieldRow>
          <SettingsFieldRow label="매수 예산 (%)">
            <input
              type="number"
              className="vtd-trade-meta-value ptd-settings-input"
              min={1}
              max={100}
              value={defaults.paperAutoTradeBudgetPct}
              disabled={!defaults.paperAutoTradeEnabled}
              onChange={e => patch({ paperAutoTradeBudgetPct: Number(e.target.value) })}
            />
          </SettingsFieldRow>
          <SettingsFieldRow label="미체결 주문 처리">
            <select
              className="vtd-trade-meta-value ptd-settings-input ptd-settings-select"
              value={defaults.paperOrderFillMode}
              onChange={e => patch({ paperOrderFillMode: e.target.value as 'LIMIT_ONLY' | 'NEXT_TICK' | 'AUTO_CANCEL' })}
            >
              <option value="LIMIT_ONLY">A. 지정가 유지 (조건 충족 시 체결)</option>
              <option value="NEXT_TICK">B. 다음 틱 강제 체결 (시장가 동일)</option>
              <option value="AUTO_CANCEL">C. 허용폭 초과 시 자동 취소</option>
            </select>
          </SettingsFieldRow>
          {defaults.paperOrderFillMode === 'AUTO_CANCEL' && (
            <SettingsFieldRow label="허용 이탈폭 (%)">
              <input
                type="number"
                className="vtd-trade-meta-value ptd-settings-input"
                min={0.1}
                max={50}
                step={0.1}
                value={defaults.paperOrderAutoCancelPct}
                onChange={e => patch({ paperOrderAutoCancelPct: Number(e.target.value) })}
              />
            </SettingsFieldRow>
          )}
        </div>
      </div>
    </div>
  );

  const bottom = (
    <div className="ptd-settings-panel ptd-settings-panel--account ptd-settings-panel--stages">
      {selectedMarket ? (
        <PaperSymbolStageSettings
          symbol={selectedMarket}
          allocation={selectedAlloc}
          onSaved={onSettingsSaved}
        />
      ) : (
        <p className="ptd-muted ptd-item-card-empty">중앙 투자금 관리에서 종목을 선택하면 분할 매매 단계를 설정할 수 있습니다.</p>
      )}
      <div className="ptd-settings-panel-divider" aria-hidden />
      <div className="vtd-target-item ptd-item-card ptd-settings-card">
        <div className="ptd-item-card-metrics">
          <SettingsFieldRow label="초기 자본 (KRW)">
            <input
              type="number"
              className="vtd-trade-meta-value ptd-settings-input"
              min={100000}
              step={100000}
              value={defaults.paperInitialCapital}
              onChange={e => patch({ paperInitialCapital: Number(e.target.value) })}
            />
          </SettingsFieldRow>
          <SettingsFieldRow label="수수료율 (%)">
            <input
              type="number"
              className="vtd-trade-meta-value ptd-settings-input"
              min={0}
              max={1}
              step={0.01}
              value={defaults.paperFeeRatePct}
              onChange={e => patch({ paperFeeRatePct: Number(e.target.value) })}
            />
          </SettingsFieldRow>
          <SettingsFieldRow label="슬리피지 (%)">
            <input
              type="number"
              className="vtd-trade-meta-value ptd-settings-input"
              min={0}
              max={5}
              step={0.01}
              value={defaults.paperSlippagePct}
              onChange={e => patch({ paperSlippagePct: Number(e.target.value) })}
            />
          </SettingsFieldRow>
          <SettingsFieldRow label="최소 주문 (KRW)">
            <input
              type="number"
              className="vtd-trade-meta-value ptd-settings-input"
              min={1000}
              step={1000}
              value={defaults.paperMinOrderKrw}
              onChange={e => patch({ paperMinOrderKrw: Number(e.target.value) })}
            />
          </SettingsFieldRow>
        </div>
      </div>
      <button type="button" className="bps-btn bps-btn--danger ptd-settings-reset" onClick={() => void handleReset()}>
        계좌 초기화
      </button>
    </div>
  );

  return (
    <PaperSplitPanel
      className="ptd-split-panel--left"
      topTitle="운영 · 자동매매"
      bottomTitle="종목별 분할 매매 · 계좌"
      top={top}
      bottom={bottom}
    />
  );
};

export default PaperLeftSettingsTab;