/** 복합지표 — 동일 지표 2개(서로 다른 기간) 간 교차·비교 조건 */
import type { ConditionDSL } from './strategyTypes';
import { DEFAULT_START_CANDLE, normalizeStartCandleType } from './strategyStartNodes';
import { migratePriceExtremeCondition } from './priceExtremeIndicators';

export interface CompositePeriodDef {
  rsiPeriod: number;
  cciPeriod: number;
  adxPeriod: number;
  williamsR: number;
  trixPeriod: number;
  vrPeriod: number;
  psyPeriod: number;
  newPsy: number;
  investPsy: number;
  dispShort: number;
  dispMid: number;
}

export interface CompositeIndicatorItem {
  value: string;
  label: string;
  desc: string;
}

/** 돈치안 채널 — 단기·장기 고가/저가선 비교 */
export function isDonchianComposite(ind: string): boolean {
  return ind === 'DONCHIAN';
}

/** @deprecated DONCHIAN 전용 — isDonchianComposite 사용 */
export function isPriceExtremeComposite(ind: string): boolean {
  return isDonchianComposite(ind);
}

export function donchianUpperField(period: number): string {
  return `DC_UPPER_${period}`;
}

export function donchianLowerField(period: number): string {
  return `DC_LOWER_${period}`;
}

export function donchianMiddleField(period: number): string {
  return `DC_MIDDLE_${period}`;
}

/** DC_UPPER_9 / DC_LOWER_20 등에서 기간 추출 */
export function parseDonchianPeriod(field?: string): number | null {
  if (!field) return null;
  const m = field.match(/^DC_(?:UPPER|LOWER|MIDDLE)_(\d+)$/);
  if (!m) return null;
  const n = parseInt(m[1], 10);
  return Number.isFinite(n) && n > 0 ? n : null;
}

/** 복합지표 팔레트 */
export const COMPOSITE_INDICATOR_ITEMS: CompositeIndicatorItem[] = [
  { value: 'DONCHIAN', label: '돈치안 채널', desc: '단기·장기 고가/저가 채널 비교 (9·20일)' },
  { value: 'RSI', label: 'RSI', desc: 'RSI 기간 교차' },
  { value: 'CCI', label: 'CCI', desc: 'CCI 기간 교차' },
  { value: 'ADX', label: 'ADX', desc: 'ADX 기간 교차' },
  { value: 'WILLIAMS_R', label: 'Williams %R', desc: 'Williams %R 교차' },
  { value: 'TRIX', label: 'TRIX', desc: 'TRIX 기간 교차' },
  { value: 'VR', label: 'VR', desc: 'VR 기간 교차' },
  { value: 'PSYCHOLOGICAL', label: '심리도', desc: '심리도 기간 교차' },
  { value: 'INVEST_PSYCHOLOGICAL', label: '투자심리도', desc: '투자심리도 교차' },
  { value: 'DISPARITY', label: '이격도', desc: '이격도 기간 교차' },
];

export function getCompositeDefaultPeriods(ind: string, def: CompositePeriodDef): { short: number; long: number } {
  switch (ind) {
    case 'DONCHIAN':
      return { short: 9, long: 20 };
    case 'RSI': return { short: def.rsiPeriod, long: Math.max(def.rsiPeriod * 2, 20) };
    case 'CCI': return { short: def.cciPeriod, long: Math.max(def.cciPeriod * 2, 26) };
    case 'ADX': return { short: def.adxPeriod, long: Math.max(def.adxPeriod * 2, 28) };
    case 'WILLIAMS_R': return { short: def.williamsR, long: Math.max(def.williamsR * 2, 28) };
    case 'TRIX': return { short: def.trixPeriod, long: Math.max(def.trixPeriod * 2, 24) };
    case 'VR': return { short: def.vrPeriod, long: Math.max(def.vrPeriod * 2, 20) };
    case 'PSYCHOLOGICAL': return { short: def.psyPeriod, long: Math.max(def.psyPeriod * 2, 24) };
    case 'NEW_PSYCHOLOGICAL': return { short: def.newPsy, long: Math.max(def.newPsy * 2, 20) };
    case 'INVEST_PSYCHOLOGICAL': return { short: def.investPsy, long: Math.max(def.investPsy * 2, 20) };
    case 'DISPARITY': return { short: def.dispShort, long: def.dispMid };
    default: return { short: 9, long: 20 };
  }
}

export function compositeValueField(ind: string, period: number): string {
  switch (ind) {
    case 'DONCHIAN':
      return donchianUpperField(period);
    case 'RSI': return `RSI_VALUE_${period}`;
    case 'CCI': return `CCI_VALUE_${period}`;
    case 'ADX': return `ADX_VALUE_${period}`;
    case 'WILLIAMS_R': return `WILLIAMS_R_VALUE_${period}`;
    case 'TRIX': return `TRIX_VALUE_${period}`;
    case 'VR': return `VR_VALUE_${period}`;
    case 'PSYCHOLOGICAL': return `PSY_VALUE_${period}`;
    case 'NEW_PSYCHOLOGICAL': return `NEW_PSY_VALUE_${period}`;
    case 'INVEST_PSYCHOLOGICAL': return `INVEST_PSY_VALUE_${period}`;
    case 'DISPARITY': return `DISPARITY${period}`;
    default: return `${ind}_VALUE_${period}`;
  }
}

/** K_ 접두 임계값·hline 역할 심볼 — 기간 파싱·복합지표 승격에서 제외 */
export function isThresholdField(field?: string): boolean {
  return !!field && (field.startsWith('K_')
    || field === 'HL_OVER' || field === 'HL_MID' || field === 'HL_UNDER');
}

const COMPOSITE_VALUE_PREFIX: Record<string, string> = {
  RSI: 'RSI_VALUE',
  CCI: 'CCI_VALUE',
  ADX: 'ADX_VALUE',
  WILLIAMS_R: 'WILLIAMS_R_VALUE',
  TRIX: 'TRIX_VALUE',
  VR: 'VR_VALUE',
  PSYCHOLOGICAL: 'PSY_VALUE',
  NEW_PSYCHOLOGICAL: 'NEW_PSY_VALUE',
  INVEST_PSYCHOLOGICAL: 'INVEST_PSY_VALUE',
};

/** 복합지표용 값 라인 필드(CCI_VALUE_9 등)인지 — K_100 임계값은 false */
export function isCompositeValueField(ind: string, field?: string): boolean {
  if (!field || isThresholdField(field)) return false;
  if (isDonchianComposite(ind)) {
    return parseDonchianPeriod(field) != null;
  }
  if (ind === 'DISPARITY') {
    return field.startsWith('DISPARITY') && field.length > 'DISPARITY'.length
      && /^\d+$/.test(field.slice('DISPARITY'.length));
  }
  const prefix = COMPOSITE_VALUE_PREFIX[ind];
  if (!prefix) return false;
  return field === prefix || field.startsWith(`${prefix}_`);
}

export function parsePeriodFromCompositeField(ind: string, field?: string): number | null {
  if (!field || isThresholdField(field)) return null;
  if (isDonchianComposite(ind)) {
    return parseDonchianPeriod(field);
  }
  if (ind === 'DISPARITY' && field.startsWith('DISPARITY')) {
    const n = parseInt(field.slice('DISPARITY'.length), 10);
    return Number.isFinite(n) && n > 0 ? n : null;
  }
  const suffix = field.match(/_(\d+)$/);
  if (!suffix) return null;
  const n = parseInt(suffix[1], 10);
  return Number.isFinite(n) && n > 0 ? n : null;
}

/** 돈치안 — 단기·장기 고가/저가선 비교 */
export function syncDonchianCompositeFields(cond: ConditionDSL): ConditionDSL {
  const leftP = cond.leftPeriod ?? 9;
  const rightP = cond.rightPeriod ?? 20;
  const leftCt = normalizeStartCandleType(cond.leftCandleType ?? DEFAULT_START_CANDLE);
  const rightCt = normalizeStartCandleType(cond.rightCandleType ?? DEFAULT_START_CANDLE);
  const defaultBand = (period: number) => donchianUpperField(period);

  return {
    ...cond,
    composite: true,
    leftPeriod: leftP,
    rightPeriod: rightP,
    leftField: cond.leftField ?? defaultBand(leftP),
    rightField: cond.rightField ?? defaultBand(rightP),
    leftCandleType: leftCt,
    rightCandleType: rightCt,
    period: undefined,
  };
}

export function syncCompositeFields(cond: ConditionDSL): ConditionDSL {
  if (!cond.composite) return cond;
  if (isDonchianComposite(cond.indicatorType)) {
    return syncDonchianCompositeFields(cond);
  }
  const leftP = cond.leftPeriod
    ?? parsePeriodFromCompositeField(cond.indicatorType, cond.leftField)
    ?? undefined;
  const rightP = cond.rightPeriod
    ?? parsePeriodFromCompositeField(cond.indicatorType, cond.rightField)
    ?? undefined;
  if (leftP == null || rightP == null) {
    return {
      ...cond,
      composite: true,
      ...(leftP != null ? { leftPeriod: leftP } : null),
      ...(rightP != null ? { rightPeriod: rightP } : null),
    };
  }
  const leftCt = normalizeStartCandleType(cond.leftCandleType ?? DEFAULT_START_CANDLE);
  const rightCt = normalizeStartCandleType(cond.rightCandleType ?? DEFAULT_START_CANDLE);
  return {
    ...cond,
    composite: true,
    leftPeriod: leftP,
    rightPeriod: rightP,
    leftField: compositeValueField(cond.indicatorType, leftP),
    rightField: compositeValueField(cond.indicatorType, rightP),
    leftCandleType: leftCt,
    rightCandleType: rightCt,
    period: undefined,
  };
}

export function normalizeCompositeCondition(cond: ConditionDSL): ConditionDSL {
  const migrated = migratePriceExtremeCondition(cond);
  if (migrated !== cond) return migrated;

  if (cond.composite) {
    if (isThresholdField(cond.leftField) || isThresholdField(cond.rightField)) {
      return {
        ...cond,
        composite: false,
        leftPeriod: undefined,
        rightPeriod: undefined,
      };
    }
    return syncCompositeFields(cond);
  }
  const ind = cond.indicatorType;
  if (parseDonchianPeriod(cond.leftField) != null && parseDonchianPeriod(cond.rightField) != null) {
    const leftP = parseDonchianPeriod(cond.leftField)!;
    const rightP = parseDonchianPeriod(cond.rightField)!;
    if (leftP !== rightP) {
      return syncDonchianCompositeFields({
        ...cond,
        composite: true,
        indicatorType: 'DONCHIAN',
        leftPeriod: leftP,
        rightPeriod: rightP,
      });
    }
  }
  if (!isCompositeValueField(ind, cond.leftField) || !isCompositeValueField(ind, cond.rightField)) {
    return migratePriceExtremeCondition(cond);
  }
  const leftP = parsePeriodFromCompositeField(ind, cond.leftField);
  const rightP = parsePeriodFromCompositeField(ind, cond.rightField);
  if (leftP && rightP && leftP !== rightP) {
    return syncCompositeFields({
      ...cond,
      composite: true,
      leftPeriod: leftP,
      rightPeriod: rightP,
    });
  }
  return migratePriceExtremeCondition(cond);
}

export function makeCompositeCondition(
  ind: string,
  signalType: 'buy' | 'sell',
  def: CompositePeriodDef,
): ConditionDSL {
  const { short, long } = getCompositeDefaultPeriods(ind, def);
  if (isDonchianComposite(ind)) {
    return syncDonchianCompositeFields({
      indicatorType: ind,
      conditionType: signalType === 'buy' ? 'CROSS_UP' : 'CROSS_DOWN',
      composite: true,
      leftPeriod: short,
      rightPeriod: long,
      leftCandleType: DEFAULT_START_CANDLE,
      rightCandleType: DEFAULT_START_CANDLE,
      candleRange: 1,
    });
  }
  return syncCompositeFields({
    indicatorType: ind,
    conditionType: signalType === 'buy' ? 'CROSS_UP' : 'CROSS_DOWN',
    composite: true,
    leftPeriod: short,
    rightPeriod: long,
    leftCandleType: DEFAULT_START_CANDLE,
    rightCandleType: DEFAULT_START_CANDLE,
    candleRange: 1,
  });
}

/** 돈치안 복합 — 조건대상 드롭다운 옵션 */
export function getDonchianFieldOpts(
  allPeriods: number[],
): { value: string; label: string }[] {
  return [
    ...allPeriods.map(p => ({ value: donchianUpperField(p), label: `${p}일 최고가선` })),
    ...allPeriods.map(p => ({ value: donchianLowerField(p), label: `${p}일 최저가선` })),
  ];
}

export function compositePeriodLabel(ind: string, def: CompositePeriodDef): string {
  const { short, long } = getCompositeDefaultPeriods(ind, def);
  return `${short} / ${long}`;
}

export function compositeDisplayName(ind: string): string {
  const item = COMPOSITE_INDICATOR_ITEMS.find(i => i.value === ind);
  if (ind === 'DONCHIAN') return '돈치안 채널 (9·20일)';
  if (item) return `${item.label} + ${item.label}`;
  return `${ind} + ${ind}`;
}

export function compositeElementLabel(ind: string, slot: 1 | 2): string {
  if (ind === 'DONCHIAN') {
    return slot === 1 ? '채널 단기' : '채널 장기';
  }
  const item = COMPOSITE_INDICATOR_ITEMS.find(i => i.value === ind);
  const name = item?.label ?? ind;
  return `${name} ${slot}`;
}

/** 복합지표 조건대상 라벨 */
export function compositeFieldLabel(ind: string, slot: 1 | 2, period: number): string {
  if (ind === 'DONCHIAN') {
    return `${period}일 ${slot === 1 ? '단기' : '장기'} 고가선`;
  }
  return `${compositeElementLabel(ind, slot)} 라인(${period}일)`;
}