/**
 * 기둥 배근 입력 (승인 2026-10-26, 시안 ③ 기둥 삽도). The inputs of the 기둥 panel; the names match ColumnInput.
 * Defaults are the 기둥철근 (1).md P1 values; the ranges are proposed and pending the design-standard check.
 * The 주철근 하단 갈고리 is fixed (no input).
 */
export interface ColumnRebarSettings {
  /** K1 중심 피복 c (기둥 면 ~ P1 중심, mm). */
  c: number;
  /** 띠철근 간격 K3 (일반 구간, mm). */
  ctcP3: number;
  /** 띠철근 간격 K5 (단부, mm). */
  ctcP5: number;
  /** 띠철근 간격 K4 (기초 안, mm). */
  ctcP4: number;
  /** 크로스타이 K6 간격 (단 간격, mm). */
  ctcP6: number;
  /** 주철근 커플러 간격 (기초 상면부터, mm). */
  ctcCoupler: number;
  /** P2 커플러를 P1보다 올리는 높이 (mm). */
  dzCp2: number;
  /** 주철근 원주 등분 수 n_div (P1·P2 공통, 짝수). */
  nDiv: number;
}

export const DEFAULT_COLUMN_REBAR: ColumnRebarSettings = {
  c: 125,
  ctcP3: 300,
  ctcP5: 120,
  ctcP4: 120,
  ctcP6: 1800,
  ctcCoupler: 3000,
  dzCp2: 150,
  nDiv: 46,
};

/** Allowed range per input (inclusive, mm). */
export const COLUMN_REBAR_RANGES: Record<keyof ColumnRebarSettings, [number, number]> = {
  c: [100, 150],
  ctcP3: [200, 400],
  ctcP5: [80, 200],
  ctcP4: [80, 200],
  ctcP6: [1200, 2400],
  ctcCoupler: [2000, 4000],
  dzCp2: [0, 300],
  nDiv: [40, 50],
};

export interface ColumnSettingsIssue {
  code: 'CL01' | 'CL02';
  key: keyof ColumnRebarSettings;
  message: string;
}

/**
 * CL01: a value is not a finite number or is out of range (W). CL02: n_div is odd (the main bars come in pairs around the circle).
 */
export function columnSettingsIssues(s: ColumnRebarSettings): ColumnSettingsIssue[] {
  const out: ColumnSettingsIssue[] = [];
  for (const key of Object.keys(COLUMN_REBAR_RANGES) as (keyof ColumnRebarSettings)[]) {
    const v = s[key];
    const [lo, hi] = COLUMN_REBAR_RANGES[key];
    if (!Number.isFinite(v) || v < lo || v > hi) {
      out.push({ code: 'CL01', key, message: `CL01 ${key} ${v} 범위 밖 (${lo}–${hi})` });
    }
  }
  if (Number.isFinite(s.nDiv) && s.nDiv % 2 !== 0) {
    out.push({ code: 'CL02', key: 'nDiv', message: `CL02 주철근 등분 수 ${s.nDiv}는 홀수 (짝수만 허용)` });
  }
  return out;
}