import type { PierInput } from './types';

/** EL in metres, lengths in mm. User image and clarifications 2026-11-05; casing default and rock socket per 현장타설말뚝철근.md (2026-11-06). */
export interface CastInPlaceShapeSettings {
  betaLengthMm?: number;
  weatheredRockEl?: number;
  bedrockEl?: number;
  casingOn?: boolean;
  casingTopEl?: number;
  casingBottomEl?: number;
  clayBottomEl?: number;
  /** 암반 근입부 지름 (mm, 희생강관 아래). Absent = D − 150 with a casing, D without (현장타설말뚝철근.md §1.1, Q-PL3). */
  socketDiameterMm?: number;
}

/** Rock-socket diameter (mm): the input, else D − 150 when the casing is on (default on, spec §3 2026-11-06), else D. */
export function castSocketDiameterMm(input: Pick<PierInput, 'castInPlaceShape' | 'columnDiameterMm'>): number {
  const s = input.castInPlaceShape ?? {};
  const d = input.columnDiameterMm ?? 2000;
  return s.socketDiameterMm ?? ((s.casingOn ?? true) ? d - 150 : d);
}

export function castShape(input: Pick<PierInput, 'groundEl' | 'pileLengthMm' | 'castInPlaceShape' | 'columnDiameterMm'>) {
  const s = input.castInPlaceShape ?? {};
  const pileBottomEl = input.groundEl - input.pileLengthMm / 1000;
  const bedrockEl = s.bedrockEl ?? pileBottomEl + 1;
  const betaLengthMm = s.betaLengthMm ?? 9000;
  return {
    pileTopEl: input.groundEl, pileBottomEl,
    betaLengthMm, betaEl: input.groundEl - betaLengthMm / 1000,
    weatheredRockEl: s.weatheredRockEl ?? pileBottomEl + 5,
    bedrockEl,
    // 희생강관: 적용, 상단 지반고 + 2500 (그림 값, 엑셀 문구 + 3000 — Q-PL4 가정), 하단 = 기반암 EL.
    casingOn: s.casingOn ?? true,
    casingTopEl: s.casingTopEl ?? input.groundEl + 2.5,
    casingBottomEl: s.casingBottomEl ?? bedrockEl,
    clayBottomEl: s.clayBottomEl,
    socketDiameterMm: castSocketDiameterMm(input),
  };
}

export function castShapeIssues(value: unknown): string[] {
  if (value === undefined) return [];
  if (!value || typeof value !== 'object' || Array.isArray(value)) return ['현장타설 형상 입력 형식이 맞지 않습니다.'];
  const out: string[] = [];
  for (const [key, v] of Object.entries(value)) {
    if (v === undefined) continue;
    if (key === 'casingOn') { if (typeof v !== 'boolean') out.push('희생강관 적용 여부가 맞지 않습니다.'); }
    else if (!['betaLengthMm', 'weatheredRockEl', 'bedrockEl', 'casingTopEl', 'casingBottomEl', 'clayBottomEl', 'socketDiameterMm'].includes(key) || typeof v !== 'number' || !Number.isFinite(v) || (key === 'betaLengthMm' || key === 'socketDiameterMm') && v <= 0) out.push(`현장타설 형상 ${key} 값이 맞지 않습니다.`);
  }
  return out;
}

/** DXF note 4. Do not substitute weathered-rock EL for the independent clay-layer EL. */
export function castLowerZone(input: Pick<PierInput, 'groundEl' | 'pileLengthMm' | 'castInPlaceShape' | 'columnDiameterMm'>) {
  const s = castShape(input);
  if (s.clayBottomEl === undefined) return null;
  const d = (input.columnDiameterMm ?? 2000) / 1000;
  const a = s.betaEl - 3 * d;
  const b = s.clayBottomEl + d;
  return { bottomEl: a, topEl: b, valid: a < b };
}