/** 전략 조건 DSL — 보조지표 DB 설정과 임계값·기간 상inherit 정규화 */
import type { ConditionDSL, LogicNode } from './strategyTypes';
import type { DefType } from './strategyEditorShared';
import { getDefaultConditionFields } from './strategyEditorShared';
import {
  isThresholdOverridden,
  isValuePeriodOverridden,
  parseThresholdField,
  usesValuePeriodField,
  VALUE_FIELD_PREFIX,
} from './conditionPeriods';
import {
  defaultInheritedThresholdField,
  inferThresholdSymbolFromLegacy,
  isThresholdFieldOrSymbol,
  isThresholdSymbol,
  THRESHOLD_HL_MID,
  THRESHOLD_HL_OVER,
} from './thresholdSymbols';

function migrateConditionThreshold(
  cond: ConditionDSL,
  def: DefType,
  signalType: 'buy' | 'sell',
): ConditionDSL {
  if (isThresholdOverridden(cond)) return cond;

  let rightField = cond.rightField;
  if (rightField?.startsWith('K_')) {
    rightField = inferThresholdSymbolFromLegacy(rightField, cond.indicatorType, def.hlThresh);
  }
  if (!rightField || (!isThresholdSymbol(rightField) && !rightField.startsWith('K_'))) {
    const defaults = getDefaultConditionFields(cond.indicatorType, signalType, def);
    if (isThresholdFieldOrSymbol(defaults.r)) {
      rightField = defaults.r;
    }
  }

  const next: ConditionDSL = {
    ...cond,
    rightField,
    thresholdOverride: false,
  };
  const { targetValue: _t, ...rest } = next;
  return rest;
}

function migrateConditionPeriod(cond: ConditionDSL): ConditionDSL {
  if (isValuePeriodOverridden(cond)) return cond;
  const prefix = VALUE_FIELD_PREFIX[cond.indicatorType];
  if (!prefix || !usesValuePeriodField(cond)) return cond;
  const lf = cond.leftField ?? '';
  if (lf.startsWith(`${prefix}_`)) {
    const { period: _p, ...rest } = cond;
    return { ...rest, leftField: prefix, valuePeriodOverride: false };
  }
  return cond;
}

export function migrateConditionForEditor(
  cond: ConditionDSL,
  def: DefType,
  signalType: 'buy' | 'sell',
): ConditionDSL {
  return migrateConditionPeriod(migrateConditionThreshold(cond, def, signalType));
}

function migrateLogicNode(
  node: LogicNode,
  def: DefType,
  signalType: 'buy' | 'sell',
): LogicNode {
  let next = node;
  if (node.type === 'CONDITION' && node.condition) {
    next = { ...node, condition: migrateConditionForEditor(node.condition, def, signalType) };
  }
  if (next.children?.length) {
    next = { ...next, children: next.children.map(c => migrateLogicNode(c, def, signalType)) };
  }
  return next;
}

/** 전략 로드·편집기 진입 시 레거시 K_ 스냅샷 → hline 역할 심볼 */
export function migrateLogicRootForEditor(
  root: LogicNode | null,
  orphans: LogicNode[],
  def: DefType,
  signalType: 'buy' | 'sell',
): { root: LogicNode | null; orphans: LogicNode[] } {
  return {
    root: root ? migrateLogicNode(root, def, signalType) : null,
    orphans: orphans.map(n => migrateLogicNode(n, def, signalType)),
  };
}

/** 저장 직전 — 상속 모드는 숫자 스냅샷·targetValue 제거 */
export function normalizeConditionForPersistence(cond: ConditionDSL): ConditionDSL {
  let next: ConditionDSL = { ...cond };

  if (!isThresholdOverridden(next)) {
    if (next.rightField?.startsWith('K_')) {
      next.rightField = defaultInheritedThresholdField(next.indicatorType);
    }
    if (!isThresholdSymbol(next.rightField)) {
      const role = next.indicatorType === 'DISPARITY' || next.indicatorType === 'VOLUME_OSC'
        || next.indicatorType === 'TRIX'
        ? THRESHOLD_HL_MID : THRESHOLD_HL_OVER;
      if (parseThresholdField(next.rightField) != null || !next.rightField) {
        next.rightField = role;
      }
    }
    const { targetValue: _t, ...rest } = next;
    next = { ...rest, thresholdOverride: false };
  }

  if (!isValuePeriodOverridden(next)) {
    const prefix = VALUE_FIELD_PREFIX[next.indicatorType];
    if (prefix && usesValuePeriodField(next)) {
      next.leftField = prefix;
    }
    const { period: _p, ...rest } = next;
    next = rest;
  }

  return next;
}

function normalizeLogicNode(node: LogicNode): LogicNode {
  let next = node;
  if (node.type === 'CONDITION' && node.condition) {
    next = { ...node, condition: normalizeConditionForPersistence(node.condition) };
  }
  if (next.children?.length) {
    next = { ...next, children: next.children.map(normalizeLogicNode) };
  }
  return next;
}

export function normalizeLogicRootForPersistence(root: LogicNode | null): LogicNode | null {
  return root ? normalizeLogicNode(root) : null;
}