/**
 * 전략 조건 읽기전용 뷰 — TradeAlertModal 내 "전략 조건" 탭에 표시
 * LogicNode 트리를 전략 편집기와 유사한 카드 형태로 렌더링한다.
 */
import React from 'react';
import type { LogicNode } from '../../utils/strategyTypes';
import { CONDITION_LABEL, resolveCandleRangeMode, candleRangeWindowBars } from '../../utils/strategyTypes';
import { getStrategyIndicatorDisplayName } from '../../utils/strategyPaletteStorage';
import { getIndicatorPaletteCategory } from '../strategyEditor/paletteCategories';
import { nodeToText } from '../../utils/strategyEditorShared';
import { formatStrategyCandleLabel } from '../../utils/strategyStartNodes';
import type { StrategyDto } from '../../utils/backendApi';

/* ── nodeToText 출력에서 조건대상1 / 조건대상2 분리 ─────────────── */
/** nodeToText 가 COND_OPTIONS 라벨로 출력하는 문자열 목록 (긴 것 우선으로 체크) */
const COND_SEARCH = [
  '구름 상향 돌파', '구름 하향 돌파',
  '선행스팬1 상향돌파 선행스팬2', '선행스팬1 하향돌파 선행스팬2',
  '선행스팬1 > 선행스팬2', '선행스팬1 < 선행스팬2',
  '후행스팬 > 가격', '후행스팬 < 가격',
  '상향 돌파', '하향 돌파',
  '상승 기울기', '하락 기울기',
  '이상 (>=)', '이하 (<=)',
  '초과 (>)', '미만 (<)',
  '같음 (==)', '다름 (!=)',
  '차이 > 값', '차이 < 값',
  'N일 연속 유지',
  '구름 위', '구름 아래', '구름 안',
];

function splitDescByCondType(descText: string): { left: string; right: string; mid: string } {
  for (const cond of COND_SEARCH) {
    const idx = descText.indexOf(cond);
    if (idx > 0) {
      return {
        left: descText.slice(0, idx).trim(),
        mid:  cond,
        right: descText.slice(idx + cond.length).trim(),
      };
    }
  }
  return { left: descText, mid: '', right: '' };
}

/* ── 개별 조건 카드 ────────────────────────────────────────────── */
const ConditionCard: React.FC<{ node: LogicNode }> = ({ node }) => {
  const cond = node.condition;
  if (!cond) return null;

  const indType  = cond.indicatorType;
  const indLabel = getStrategyIndicatorDisplayName(indType);
  const cat      = getIndicatorPaletteCategory(indType);
  const fullText = nodeToText(node);

  const prefix   = `${indLabel} - `;
  const descText = fullText.startsWith(prefix) ? fullText.slice(prefix.length) : fullText;
  const { left, mid: condStr, right } = splitDescByCondType(descText);

  const rangeMode = resolveCandleRangeMode(cond);
  const rangeN = candleRangeWindowBars(cond);
  const candleRangeLabel = rangeMode === 'CURRENT'
    ? '현재 캔들'
    : rangeMode === 'EXISTS_IN'
      ? `최근 ${rangeN}봉 내 존재`
      : `최근 ${rangeN}봉 내 미존재`;

  const condLabelDisplay = CONDITION_LABEL[cond.conditionType] ?? (condStr || cond.conditionType);

  return (
    <div className="scv-cond-card">
      <div className="scv-cond-header">
        <span className={`se-ind-chip se-ind-chip--${cat} scv-ind-chip`}>{indType}</span>
        <span className="scv-cond-title">{indLabel} - {descText}</span>
      </div>
      <div className="scv-cond-fields">
        <div className="scv-cond-field">
          <span className="scv-cond-field-lbl">캔들범위</span>
          <span className="scv-cond-field-val">{candleRangeLabel}</span>
        </div>
        {left && (
          <div className="scv-cond-field">
            <span className="scv-cond-field-lbl">조건대상1</span>
            <span className="scv-cond-field-val">{left}</span>
          </div>
        )}
        {right && (
          <div className="scv-cond-field">
            <span className="scv-cond-field-lbl">조건대상2</span>
            <span className="scv-cond-field-val">{right}</span>
          </div>
        )}
        <div className="scv-cond-field">
          <span className="scv-cond-field-lbl">조건</span>
          <span className="scv-cond-field-val">{condLabelDisplay}</span>
        </div>
      </div>
    </div>
  );
};

/* ── 노드 트리 재귀 렌더러 ─────────────────────────────────────── */
function renderNode(node: LogicNode): React.ReactNode {
  if (node.type === 'CONDITION') {
    return <ConditionCard key={node.id} node={node} />;
  }

  if (node.type === 'AND' || node.type === 'OR') {
    const op       = node.type as 'AND' | 'OR';
    const opKo     = op === 'AND' ? 'AND (그리고)' : 'OR (또는)';
    const children = node.children ?? [];
    return (
      <div key={node.id} className={`scv-group scv-group--${op.toLowerCase()}`}>
        <div className="scv-group-header">
          <span className={`scv-group-badge scv-group-badge--${op.toLowerCase()}`}>{op}</span>
          <span className="scv-group-label">{opKo}</span>
          <div className="scv-group-op-toggle" aria-hidden>
            <span className={op === 'AND' ? 'scv-op-active' : 'scv-op-dim'}>AND</span>
            <span className={op === 'OR'  ? 'scv-op-active' : 'scv-op-dim'}>OR</span>
          </div>
        </div>
        <div className="scv-group-body">
          {children.map(child => renderNode(child))}
        </div>
      </div>
    );
  }

  if (node.type === 'NOT') {
    const inner = node.children?.[0];
    return (
      <div key={node.id} className="scv-group scv-group--not">
        <div className="scv-group-header">
          <span className="scv-group-badge scv-group-badge--not">NOT</span>
          <span className="scv-group-label">NOT (부정)</span>
        </div>
        <div className="scv-group-body">
          {inner ? renderNode(inner) : <span className="scv-empty">빈 NOT</span>}
        </div>
      </div>
    );
  }

  if (node.type === 'TIMEFRAME') {
    const inner     = node.children?.[0];
    const types     = node.candleTypes?.length ? node.candleTypes : [node.candleType ?? '1m'];
    const tfLabel   = types.map(formatStrategyCandleLabel).join(' · ');
    return (
      <div key={node.id} className="scv-timeframe">
        <div className="scv-timeframe-header">
          <span className="scv-timeframe-dot">●</span>
          <span>START</span>
          <span className="scv-timeframe-badge">{tfLabel}</span>
        </div>
        {inner
          ? <div className="scv-timeframe-body">{renderNode(inner)}</div>
          : <span className="scv-empty">빈 조건</span>
        }
      </div>
    );
  }

  return null;
}

/* ── 매수/매도 조건 트리 ─────────────────────────────────────────── */
const ConditionTree: React.FC<{ root: LogicNode | null | undefined }> = ({ root }) => {
  if (!root) return <p className="scv-empty">조건이 없습니다.</p>;
  return <div className="scv-tree">{renderNode(root)}</div>;
};

/* ── 메인 컴포넌트 ───────────────────────────────────────────────── */
interface Props {
  strategy: StrategyDto;
  /** 알림의 신호 타입으로 초기 탭 결정 */
  signalType?: 'BUY' | 'SELL';
}

const StrategyConditionView: React.FC<Props> = ({ strategy, signalType }) => {
  const hasBuy  = Boolean(strategy.buyCondition);
  const hasSell = Boolean(strategy.sellCondition);
  const showBoth = hasBuy && hasSell;

  const [tab, setTab] = React.useState<'buy' | 'sell'>(
    signalType === 'SELL' && hasSell ? 'sell' : 'buy',
  );

  const buyRoot  = strategy.buyCondition  as LogicNode | null | undefined;
  const sellRoot = strategy.sellCondition as LogicNode | null | undefined;

  return (
    <div className="scv-root">
      {showBoth && (
        <div className="scv-signal-tabs">
          <button
            type="button"
            className={`scv-signal-tab${tab === 'buy' ? ' scv-signal-tab--active scv-signal-tab--buy' : ''}`}
            onClick={() => setTab('buy')}
          >
            매수 조건 (Entry)
          </button>
          <button
            type="button"
            className={`scv-signal-tab${tab === 'sell' ? ' scv-signal-tab--active scv-signal-tab--sell' : ''}`}
            onClick={() => setTab('sell')}
          >
            매도 조건 (Exit)
          </button>
        </div>
      )}

      {!showBoth && hasBuy && (
        <div className="scv-signal-label scv-signal-label--buy">매수 조건 (Entry)</div>
      )}
      {!showBoth && hasSell && (
        <div className="scv-signal-label scv-signal-label--sell">매도 조건 (Exit)</div>
      )}

      <div className="scv-body">
        {showBoth ? (
          tab === 'buy'
            ? <ConditionTree root={buyRoot} />
            : <ConditionTree root={sellRoot} />
        ) : hasBuy ? (
          <ConditionTree root={buyRoot} />
        ) : (
          <ConditionTree root={sellRoot} />
        )}
      </div>
    </div>
  );
};

export default StrategyConditionView;