import type { PierModel } from '../geometry';
import { bearingBlockRebar, totals } from './bearing-block';
import { bottomPiece, topBarLength, widthLayout } from './coping-main';
import { shearBars, sideRows, C14_COUNTS, c14Total, STEP_BAR_COUNTS, shearULength, SIDE_LENGTHS, STEP_LENGTHS, capLength, PIECES_PER_POSITION } from './coping';
import { columnRebar, COLUMN_P1 } from './column';
import { bottomBars, crossBars, sideBars, assemblyBars, shearB9 } from './footing';
import { DEFAULT_MATERIAL, isAssumedMaterial, Material, splitPieces } from './common';

/** 근거 badge (spec §6.1): where the value comes from. */
export type Basis = 'input' | 'default' | 'calc' | 'assumed';

/** One line of a 철근표. length is null where the document gives no length yet. */
export interface RebarRow {
  member: 'bearing' | 'coping' | 'column' | 'footing';
  name: string;
  size: string;
  count: number;
  length: number | null;
  note: string;
  /** 간격 (설계 간격, mm or text), 실간격 (cycle 묶음 기준), 위치, 방향, 형상, 근거. */
  spacing: string;
  actual: string;
  position: string;
  direction: string;
  shape: string;
  basis: Basis;
}

export interface RebarWarning {
  code: string;
  message: string;
  /** Where the alert points: a member tab, or the 공통 설정 (for I02). */
  target: RebarRow['member'] | 'common';
  /** The bar the alert is about, so that [보기] can highlight its row. */
  bar?: string;
}

/** Table metadata per bar (코핑철근.md, 확대기초철근 (1).md, 기둥철근 (1).md, 받침블럭철근.md). */
const META: Record<string, Pick<RebarRow, 'spacing' | 'actual' | 'position' | 'direction' | 'shape' | 'basis'>> = {
  S1: { spacing: '125', actual: '125', position: '블럭 상면 − 69.1', direction: '교각축 직각', shape: '양끝 다리 꺾임', basis: 'calc' },
  S2: { spacing: '125', actual: '125', position: '블럭 상면 − 50', direction: '교각축', shape: '양끝 다리 꺾임', basis: 'calc' },
  C1: { spacing: '250', actual: '125', position: '상면 1단 (cycle-1)', direction: '교각축', shape: '양끝 꺾임', basis: 'calc' },
  C2: { spacing: '250', actual: '125', position: '상면 2단 (cycle-1)', direction: '교각축', shape: '양끝 꺾임', basis: 'calc' },
  C3: { spacing: '250', actual: '125', position: '상면 3단 (cycle-1)', direction: '교각축', shape: '양끝 꺾임', basis: 'calc' },
  C4: { spacing: '250', actual: '125', position: '상면 1단 (cycle-2)', direction: '교각축', shape: '양끝 꺾임', basis: 'calc' },
  C5: { spacing: '250', actual: '125', position: '상면 2단 (cycle-2)', direction: '교각축', shape: '양끝 꺾임', basis: 'calc' },
  C6: { spacing: '250', actual: '125', position: '상면 3단 (cycle-2)', direction: '교각축', shape: '양끝 꺾임', basis: 'calc' },
  C7: { spacing: '250', actual: '125', position: '하면 1단 (cycle-1)', direction: '교각축', shape: '하면 추종, 양끝 꺾임, 2조각 겹침', basis: 'calc' },
  C8: { spacing: '250', actual: '125', position: '하면 1단 (cycle-2)', direction: '교각축', shape: '하면 추종, 양끝 꺾임, 2조각 겹침', basis: 'calc' },
  C9: { spacing: '250', actual: '250', position: '전단 좌 경사', direction: '연직', shape: '폐합 (하부 U + 상부 삿갓)', basis: 'assumed' },
  C10: { spacing: '300', actual: '300', position: '전단 Level', direction: '연직', shape: '폐합 (하부 U + 상부 삿갓)', basis: 'assumed' },
  C11: { spacing: '250', actual: '250', position: '전단 우 경사', direction: '연직', shape: '폐합 (하부 U + 상부 삿갓)', basis: 'assumed' },
  C12: { spacing: '250', actual: '250', position: '측면 하단 (경사 하면에서 끊김)', direction: '교각축', shape: '일자 + 좌우 ㄷ형', basis: 'calc' },
  C13: { spacing: '250', actual: '250', position: '측면 상단 (끝면까지)', direction: '교각축', shape: '일자 + 좌우 ㄷ형', basis: 'calc' },
  C14: { spacing: '1000 / 2000', actual: '1000', position: '직각 수평 (위 2줄 · 아래 엇갈림)', direction: '교각축 직각', shape: '⊓ (폭 방향)', basis: 'calc' },
  C15: { spacing: '250', actual: '250', position: '계단부 가장 높은 5구간', direction: '교각축', shape: '거꾸로 된 U', basis: 'calc' },
  C16: { spacing: '250', actual: '250', position: '계단부 3·4구간', direction: '교각축', shape: 'L형', basis: 'calc' },
  P1: { spacing: '원주 46등분', actual: '—', position: '외측 r 875', direction: '연직', shape: '아래 끝 90° 갈고리, 커플러 이음', basis: 'calc' },
  P2: { spacing: '원주 46등분', actual: '—', position: '내측 r 843.2', direction: '연직', shape: '직선, 커플러 이음', basis: 'calc' },
  커플러: { spacing: '@3000 (P2 +150)', actual: '—', position: 'P1·P2 각 줄', direction: '원통', shape: 'L 150 · Ø60', basis: 'default' },
  P3: { spacing: '300', actual: '300', position: '일반 구간 (코핑 안 포함)', direction: '원형', shape: '겹침 (추천안)', basis: 'assumed' },
  P5: { spacing: '120', actual: '120', position: '단부 구간 (첫 P3 아래)', direction: '원형', shape: '반원 2개가 아닌 원형 1개, 커플러 1개', basis: 'calc' },
  P4: { spacing: '120', actual: '120', position: '확대기초 안 (마지막 P5 아래)', direction: '반원 2개', shape: '반원 2개, 커플러 2개', basis: 'calc' },
  P6: { spacing: '1800 (단)', actual: '—', position: '첫 P4부터, 단마다 4본', direction: 'U형', shape: '양끝 90° 갈고리', basis: 'calc' },
  B1: { spacing: '250', actual: '250', position: 'B5 아래 2층', direction: '교각축', shape: '⊓ 양끝 아래로', basis: 'assumed' },
  B2: { spacing: '250', actual: '125', position: '하면 1단 최외측 (cycle-2)', direction: '교각축', shape: '⊔, 다리 B1 높이까지, 2조각', basis: 'calc' },
  B3: { spacing: '250', actual: '250', position: '하면 2단 (B2·B4 + 100)', direction: '교각축', shape: '⊔ 양끝 위로', basis: 'assumed' },
  B4: { spacing: '250', actual: '125', position: '하면 1단 최외측 (cycle-1)', direction: '교각축', shape: '직선', basis: 'calc' },
  B5: { spacing: '250', actual: '250', position: '상면 최외측', direction: '교각축 직각', shape: '⊓ 양끝 아래로', basis: 'assumed' },
  B6: { spacing: '250', actual: '125', position: '하면 1단 (cycle-2)', direction: '교각축 직각', shape: '⊔, 다리 B5 높이까지', basis: 'calc' },
  B7: { spacing: '250', actual: '250', position: '하면 2단 (B6·B8 + 100)', direction: '교각축 직각', shape: '⊔ 양끝 위로', basis: 'assumed' },
  B8: { spacing: '250', actual: '125', position: '하면 1단 (cycle-1)', direction: '교각축 직각', shape: '직선', basis: 'calc' },
  'B10-1': { spacing: '200', actual: '200', position: '폭 W 양끝 면, 다리 안쪽', direction: '교각축', shape: '양끝 90° 갈고리', basis: 'calc' },
  'B10-2': { spacing: '200', actual: '200', position: '길이 L 양끝 면, 다리 안쪽', direction: '교각축 직각', shape: '양끝 90° 갈고리', basis: 'calc' },
  B11: { spacing: '500 (4s)', actual: '500', position: '조립 단 (B10-2 높이)', direction: '교각축 직각', shape: 'U 양끝 아래로', basis: 'calc' },
  B12: { spacing: '500 (4s)', actual: '500', position: '조립 단 (B10-1 높이)', direction: '교각축', shape: 'U 양끝 아래로', basis: 'calc' },
  B9: { spacing: '500 (4s)', actual: '250 (2s 엇갈림)', position: '연직, B5–B2·B4 감쌈', direction: '연직', shape: '양끝 135° 갈고리', basis: 'assumed' },
};

const FALLBACK: Pick<RebarRow, 'spacing' | 'actual' | 'position' | 'direction' | 'shape' | 'basis'> = {
  spacing: '—', actual: '—', position: '—', direction: '—', shape: '—', basis: 'calc',
};

/** 정척 L_bar (mm) from 확대기초철근.md §1.2. Bars longer than this need a splice. */
export const STANDARD_BAR = 12000;

/**
 * 철근표 for one pier (③ screen v1): bearing blocks, coping, column, footing. Built from the generated model.
 * Values come from the document rules in src/core/rebar/*. B9 (전단철근) is not computed yet.
 */
type RawRow = Omit<RebarRow, 'spacing' | 'actual' | 'position' | 'direction' | 'shape' | 'basis'>;

export function rebarSummary(model: PierModel, m: Material = DEFAULT_MATERIAL): { rows: RebarRow[]; warnings: RebarWarning[] } {
  const rows: RawRow[] = [];
  const warnings: RebarWarning[] = [];
  if (isAssumedMaterial(m)) {
    warnings.push({ code: 'I02', message: `fck ${m.fck} MPa · fy ${m.fyH} / ${m.fyS} MPa는 가정값입니다. 정착·이음 길이에 반영됩니다. 공통 설정에서 확인하세요.`, target: 'common' });
  }
  const L = model.copingL * 1000;
  const B = model.copingB * 1000;

  // Bearing blocks (§6.3 · plan C2)
  const blk = totals(bearingBlockRebar(model));
  rows.push({ member: 'bearing', name: 'S1', size: 'H19', count: blk.S1, length: 2500, note: '블럭 배치 분리, 블럭당 8본' });
  rows.push({ member: 'bearing', name: 'S2', size: 'H19', count: blk.S2, length: 2500, note: '블럭 배치 분리, 블럭당 8본' });

  // Coping (코핑철근.md §5–§8)
  const width = widthLayout(B);
  const perRow = width.count / 2; // cycle split, 12 per row
  // C1–C3 and C4–C6 are the same three top rows (row 1, 2, 3), one set per cycle.
  for (const [name, k] of [['C1', 1], ['C2', 2], ['C3', 3], ['C4', 1], ['C5', 2], ['C6', 3]] as const) {
    rows.push({ member: 'coping', name, size: 'H29', count: perRow, length: topBarLength(L, k), note: '상면, 이음 무시' });
  }
  const bottom = bottomPiece(m);
  rows.push({ member: 'coping', name: 'C7', size: 'H29', count: perRow, length: bottom.piece, note: '하면, 2조각 겹침이음' });
  rows.push({ member: 'coping', name: 'C8', size: 'H29', count: perRow, length: bottom.piece, note: '하면, 2조각 겹침이음' });
  const shear = shearBars(L);
  const uRange = (xs: number[]) => {
    const u = xs.map((x) => Math.round(shearULength(x, L)));
    return `${Math.min(...u)}–${Math.max(...u)}`;
  };
  const capRange = (xs: number[]) => {
    const c = xs.map((x) => Math.round(capLength(x, L)));
    return `${Math.min(...c)}–${Math.max(...c)}`;
  };
  const shearNote = (label: string, xs: number[]) =>
    `${label}, 하부 U ${uRange(xs)}, 삿갓 ${capRange(xs)} (l_cap 추천안, Q-K5), 조각 ${xs.length * PIECES_PER_POSITION}`;
  rows.push({ member: 'coping', name: 'C9', size: 'H25', count: shear.c9.length, length: null, note: shearNote('전단 좌 @250', shear.c9) });
  rows.push({ member: 'coping', name: 'C10', size: 'H25', count: shear.c10.length, length: null, note: shearNote('전단 Level @300', shear.c10) });
  rows.push({ member: 'coping', name: 'C11', size: 'H25', count: shear.c11.length, length: null, note: shearNote('전단 우 @250', shear.c11) });
  const side = sideRows(41.288, 42.538);
  rows.push({ member: 'coping', name: 'C12', size: 'H25', count: side.c12.length, length: null, note: `측면, 경사 하면에서 끊김, 일자 ${SIDE_LENGTHS.C12[0]}–${SIDE_LENGTHS.C12[4]}` });
  rows.push({ member: 'coping', name: 'C13', size: 'H25', count: side.c13.length, length: SIDE_LENGTHS.C13, note: '측면, 끝면까지' });
  rows.push({ member: 'coping', name: 'C14', size: 'H19', count: c14Total(), length: STEP_LENGTHS.C14, note: `위 ${C14_COUNTS.upperLines} 줄 ${C14_COUNTS.upperPerLine}본씩, 아래 ${C14_COUNTS.lower.join(' · ')} (합 ${c14Total()})` });
  rows.push({ member: 'coping', name: 'C15', size: 'H19', count: STEP_BAR_COUNTS.C15, length: STEP_LENGTHS.C15, note: '계단부, 가장 높은 구간 (거꾸로 U)' });
  rows.push({ member: 'coping', name: 'C16', size: 'H19', count: STEP_BAR_COUNTS.C16, length: STEP_LENGTHS.C16[0], note: `계단부, 3·4구간 (${STEP_LENGTHS.C16[0]} / ${STEP_LENGTHS.C16[1]})` });

  // Column (기둥철근.md · plan C4), P1 defaults
  const col = columnRebar(COLUMN_P1, m);
  rows.push({ member: 'column', name: 'P1', size: 'S32', count: col.mainP1, length: null, note: '외측 r 875, 마디 4697.5 + 갈고리 525 / 3000 ×3 / 3147 (코핑 밖 마디는 기둥철근.md §3.2)' });
  rows.push({ member: 'column', name: 'P2', size: 'S32', count: col.mainP2, length: null, note: '내측 r 843.2, 마디 4847.5 / 3000 ×3 / 2389' });
  rows.push({ member: 'column', name: '커플러', size: 'L150 Ø60', count: col.couplers, length: 150, note: '@3000, P2 +150' });
  rows.push({ member: 'column', name: 'P3', size: 'H19', count: col.p3Count, length: col.p3Length, note: `일반 구간 띠철근 @300, 겹침 ${col.lapP3} (추천안, Q-C6)` });
  rows.push({ member: 'column', name: 'P5', size: 'H19', count: col.p5Count, length: col.p5Length, note: '단부 띠철근 @120, 커플러 1개' });
  rows.push({ member: 'column', name: 'P4', size: 'H19', count: col.p4Count, length: col.p4SemicircleLength * 2, note: '확대기초 안, 반원 2개 (길이는 반원 2개 합) · B11 간섭 무시' });
  rows.push({ member: 'column', name: 'P6', size: 'H16', count: col.p6Count, length: col.p6Length, note: '크로스타이, 8단 × 4' });

  // Footing (확대기초철근 (1).md · plan C5). Only when the footing exists (not 현장타설말뚝).
  const f = model.footings[0];
  if (f) {
    const Lf = f.length * 1000;
    const Wf = f.width * 1000;
    const Hf = (f.top - f.bottom) * 1000;
    // Bars longer than the standard length are split in two (추천안, Q-B6). The count is still the bar count.
    const addBar = (b: { name: string; size: string; count: number; length: number }, note: string) => {
      const split = splitPieces(b.length, 25.4, m.fyS, m.fck, STANDARD_BAR);
      if (split) {
        rows.push({ member: 'footing', name: b.name, size: b.size, count: b.count, length: split.pieceLength, note: `${note}, 2조각 이음 (추천안, 겹침 ${Math.round(split.lap)})` });
        warnings.push({ code: 'RB-F08', message: `${b.name} 길이 ${Math.round(b.length)} mm > 정척 ${STANDARD_BAR} mm: 2조각 이음을 추천안으로 적용 (Q-B6).`, target: 'footing', bar: b.name });
      } else {
        rows.push({ member: 'footing', name: b.name, size: b.size, count: b.count, length: b.length, note });
      }
    };
    for (const b of bottomBars(Lf, Wf, Hf)) addBar(b, '교각축');
    for (const b of crossBars(Lf, Wf, Hf)) addBar(b, '교각축 직각');
    for (const b of sideBars(Lf, Wf)) rows.push({ member: 'footing', name: b.name, size: b.size, count: b.count, length: b.length, note: '측면 수평' });
    for (const b of assemblyBars(Lf, Wf)) rows.push({ member: 'footing', name: b.name, size: b.size, count: b.count, length: b.length, note: '조립 수평' });
    const b9 = shearB9(Lf, Wf, Hf);
    rows.push({ member: 'footing', name: 'B9', size: 'H16', count: b9.count, length: b9.length, note: `전단 @500 엇갈림, ${b9.rows}행 (위치·갈고리는 Q-B18·B19 제안)` });
  } else {
    warnings.push({ code: 'RB-F00', message: '현장타설말뚝은 확대기초가 없어 확대기초 철근을 만들지 않습니다.', target: 'footing' });
  }
  // Table metadata per bar (구분·간격·실간격·위치·방향·형상·근거).
  const withMeta = rows.map((r) => ({ ...r, ...(META[r.name] ?? FALLBACK) }));
  return { rows: withMeta, warnings: warnings.map((w) => ({ ...w, target: w.target ?? 'common' })) };
}