import type { PierModel } from '../core/geometry';
import { NOMINAL_DIAMETER } from '../core/rebar/common';
import { assemblyGridIndices, assemblyJs, b10Levels, b9Bars, grid, gridPositions, layers, legLength, sideDepth } from '../core/rebar/footing';
import { DEFAULT_FOOTING_REBAR } from '../core/rebar/footing-settings';

/**
 * 확대기초 · 교각축 단면 (길이 L) (승인 2026-10-27, 2단계 탭). A cut across the footing length: horizontal = L, vertical = height from the 하면.
 * Bars that run along W cross this plane as points; bars that run along L lie in it as lines (방향 교환 후 배치).
 * - B1–B4 (along W, spaced along L): points at the L grid (odd → B1·B2·B3, even → B4)
 * - B5–B8 (along L): one line per family from cover to cover
 * - B9: vertical lines at the L grid columns
 * - B10-2 (on the L faces): points per level (lowest removed); B10-1 (on the W faces, along L): lines per level (lowest removed)
 * - B11 (along W, spaced along L): points on the L grid per assembly level; B12 (along L, spaced along W): lines per assembly level
 * Every mark comes from the same functions as the rebar table and the 3D view.
 */
const COLOR = { outline: '#55606E', b5: '#0F5C66', b14: '#B4531F', b9: '#6B3FA0', b10: '#2E7D32', b11: '#55606E', b12: '#55606E', dim: '#B42318', column: '#B08D57', pile: '#8898aa' };
const L_PX = 380;
const X0 = 60;
const Y0 = 230;

export function footingSectionLSvg(model: PierModel): string {
  const foot = model.footings[0];
  if (!foot) return '<svg viewBox="0 0 600 430" width="600" height="430" role="img" aria-label="확대기초 없음"><text x="20" y="180" font-size="12">확대기초 없음</text></svg>';
  const fs = model.footingRebar ?? DEFAULT_FOOTING_REBAR;
  const L = foot.length * 1000;
  const H = (foot.top - foot.bottom) * 1000;
  const k = L_PX / L;
  const cx = X0 + L_PX / 2;
  const x = (mm: number) => cx + mm * k;
  const y = (z: number) => Y0 - z * k;
  const z = layers(H, fs);
  const parts: string[] = [];
  const line = (cls: string, bar: string, x1: number, x2: number, yy: number, color: string, width = 1.4, dash = '') =>
    `<line class="${cls}" data-bar="${bar}" x1="${x1.toFixed(1)}" x2="${x2.toFixed(1)}" y1="${yy.toFixed(1)}" y2="${yy.toFixed(1)}" stroke="${color}" stroke-width="${width}"${dash ? ` stroke-dasharray="${dash}"` : ''}/>`;
  const dot = (cls: string, bar: string, xx: number, yy: number, color: string, r = 2.6) =>
    `<circle class="${cls}" data-bar="${bar}" cx="${xx.toFixed(1)}" cy="${yy.toFixed(1)}" r="${r}" fill="${color}"/>`;
  const vline = (cls: string, bar: string, xx: number, y1: number, y2: number, color: string) =>
    `<line class="${cls}" data-bar="${bar}" x1="${xx.toFixed(1)}" x2="${xx.toFixed(1)}" y1="${y1.toFixed(1)}" y2="${y2.toFixed(1)}" stroke="${color}" stroke-width="1"/>`;
  const text = (xx: number, yy: number, s: string, anchor = 'start', fill = COLOR.outline) =>
    `<text x="${xx.toFixed(1)}" y="${yy.toFixed(1)}" font-size="10" font-family="JetBrains Mono, monospace" fill="${fill}" stroke="#fff" stroke-width="3" paint-order="stroke" text-anchor="${anchor}">${s}</text>`;
  const tick = (xx: number, yy: number) => `<line x1="${(xx - 3).toFixed(1)}" x2="${(xx + 3).toFixed(1)}" y1="${(yy + 3).toFixed(1)}" y2="${(yy - 3).toFixed(1)}" stroke="${COLOR.dim}" stroke-width="0.8"/>`;

  // Context: the column (centred, above the footing) and the piles (below, one stub per distinct L position).
  const colD = model.columnDiameterMm;
  parts.push(`<rect class="column" x="${x(-colD / 2).toFixed(1)}" y="${y(H) - 36}" width="${(colD * k).toFixed(1)}" height="36" fill="#F2E8D5" stroke="${COLOR.column}" stroke-width="0.8"/>`);
  const piles = model.piles.filter((p) => Math.abs(p.s - foot.s) <= foot.length / 2 + 1e-6);
  for (const s of [...new Set(piles.map((p) => Math.round((p.s - foot.s) * 1000)))]) {
    const d = (piles.find((p) => Math.round((p.s - foot.s) * 1000) === s)?.diameter ?? 0.6) * 1000;
    parts.push(`<rect class="pile" x="${(x(s) - d * k / 2).toFixed(1)}" y="${Y0}" width="${Math.max(3, d * k).toFixed(1)}" height="26" fill="${COLOR.pile}" stroke="#3b4656" stroke-width="0.6"/>`);
  }

  // Footing outline and the 하면 line.
  parts.push(`<rect x="${x(-L / 2).toFixed(1)}" y="${y(H).toFixed(1)}" width="${(L * k).toFixed(1)}" height="${(H * k).toFixed(1)}" fill="none" stroke="${COLOR.outline}" stroke-width="1.2"/>`);
  parts.push(line('base', '', x(-L / 2), x(L / 2), y(0), COLOR.outline, 1));

  // Cover lines on the L faces (측면 피복 c_s).
  const xa = x(-L / 2 + fs.cSide);
  const xb = x(L / 2 - fs.cSide);

  // B5–B8 (along L, 주철근): one line per family from cover to cover, with the legs at both ends
  // (B5 ⊓ down, B6 and B7 ⊔ up to the B5 height / up, B8 straight; 확대기초철근 (1).md §6).
  const legW = 1.6;
  parts.push(line('b5', 'B5', xa, xb, y(z.B5), COLOR.b5, 2));
  parts.push(line('b6', 'B6', xa, xb, y(z.B68), COLOR.b5, 2));
  parts.push(line('b7', 'B7', xa, xb, y(z.B7), COLOR.b5, 2));
  parts.push(line('b8', 'B8', xa, xb, y(z.B68), COLOR.b5, 2));
  const leg = (name: string, xx: number, y1: number, y2: number) =>
    `<line class="mainleg" data-bar="${name}" x1="${xx.toFixed(1)}" x2="${xx.toFixed(1)}" y1="${y1.toFixed(1)}" y2="${y2.toFixed(1)}" stroke="${COLOR.b5}" stroke-width="${legW}"/>`;
  for (const xx of [xa, xb]) {
    parts.push(leg('B5', xx, y(z.B5), y(z.B5 - legLength('S29'))));
    parts.push(leg('B6', xx, y(z.B68), y(z.B5)));
    parts.push(leg('B7', xx, y(z.B7), y(z.B7 + legLength('S19'))));
  }

  // B1–B4 (along W, spaced along L): points on the L grid. Odd positions carry B1, B2, B3; even carry B4 (as bottomBars).
  const xsL = gridPositions(L, fs, 'sL');
  xsL.forEach((mm, i) => {
    const xx = x(mm);
    if (i % 2 === 1) {
      parts.push(dot('b1', 'B1', xx, y(z.B1), COLOR.b14));
      parts.push(dot('b2', 'B2', xx, y(z.B24), COLOR.b14));
      parts.push(dot('b3', 'B3', xx, y(z.B3), COLOR.b14));
    } else {
      parts.push(dot('b4', 'B4', xx, y(z.B24), COLOR.b14));
    }
  });

  // B9: one vertical line per L column of the B9 grid.
  const b9 = b9Bars(L, foot.width * 1000, [], 2000, fs);
  for (const xm of [...new Set(b9.bars.map((b) => b.x))]) parts.push(vline('b9', 'B9', x(xm), y(z.B24), y(z.B5), COLOR.b9));

  // B10-2 (on the L faces, points) and B10-1 (on the W faces, lines along L), per level above the lowest.
  const levels = b10Levels(H, fs);
  const dB10 = NOMINAL_DIAMETER.S19;
  const depth2 = sideDepth(NOMINAL_DIAMETER.S25, NOMINAL_DIAMETER.S19, fs);
  for (let j = 1; j < levels; j++) {
    const zj = fs.cBottom + j * fs.sV;
    parts.push(dot('b10', 'B10-2', x(-L / 2 + depth2), y(zj), COLOR.b10, 2.2));
    parts.push(dot('b10', 'B10-2', x(L / 2 - depth2), y(zj), COLOR.b10, 2.2));
    parts.push(line('b10', 'B10-1', x(-L / 2 + depth2), x(L / 2 - depth2), y(zj + dB10), COLOR.b10, 1.2, '2 2'));
  }

  // B11 (along W, spaced along L): points on the L grid, per assembly level. B12 (along L, spaced along W): lines per level.
  const js = assemblyJs(H, fs);
  const nL = grid(L, fs, 'sL').positions - 1;
  js.forEach((j, idx) => {
    const zA = fs.cBottom + j * fs.sV;
    for (const i of assemblyGridIndices(nL, fs.kB11, idx)) parts.push(dot('b11', 'B11', x(xsL[i]), y(zA), COLOR.b11, 2.2));
    parts.push(line('b12', 'B12', xa, xb, y(zA + dB10), COLOR.b12, 1.2, '6 3'));
  });

  // Dimensions: the length line with ticks and the grid string, and the right-hand heights.
  const g = grid(L, fs, 'sL');
  const yDim = Y0 + 40;
  parts.push(`<line x1="${x(-L / 2).toFixed(1)}" x2="${x(L / 2).toFixed(1)}" y1="${yDim}" y2="${yDim}" stroke="${COLOR.dim}" stroke-width="0.8"/>`);
  parts.push(tick(x(-L / 2), yDim) + tick(x(L / 2), yDim));
  parts.push(text(x(-L / 2) - 5, yDim + 14, `${fs.cSide}`, 'end', COLOR.dim));
  parts.push(text(x(L / 2) + 5, yDim + 14, `${fs.cSide}`, 'start', COLOR.dim));
  parts.push(text(x(-L / 2 + fs.cSide) + 2, yDim + 14, `${g.e.toFixed(1)}`, 'start', COLOR.dim));
  parts.push(text(x(L / 2 - fs.cSide) - 2, yDim + 14, `${g.e.toFixed(1)}`, 'end', COLOR.dim));
  parts.push(text(cx + 150, yDim - 6, `${g.n}@${fs.sL}=${g.G}`, 'middle', COLOR.dim));
  parts.push(text(cx, 20, `교각축 단면 · 길이 ${L.toFixed(0)}`, 'middle', '#1F2937'));
  const xr = X0 + L_PX + 18;
  parts.push(`<line x1="${xr}" x2="${xr}" y1="${y(H).toFixed(1)}" y2="${y(0).toFixed(1)}" stroke="${COLOR.dim}" stroke-width="0.8"/>`);
  parts.push(tick(xr, y(H)) + tick(xr, y(0)));
  parts.push(text(xr + 6, y(H) + 12, `${fs.cTop}`, 'start', COLOR.dim));
  parts.push(text(xr + 6, (y(H) + y(0)) / 2, `${levels - 1}@${fs.sV}=${(levels - 1) * fs.sV}`, 'start', COLOR.dim));
  parts.push(text(xr + 6, y(0) - 4, `${fs.cBottom}`, 'start', COLOR.dim));

  // Bubbles outside the outline with a leader to a point of their family.
  const bubble = (name: string, bx: number, by: number, tx: number, ty: number, dotColor: string) => {
    const edgeY = by < ty ? by + 11 : by - 11;
    return `<g class="bubble" data-bubble="${name}"><line class="leader" data-bar="${name}" x1="${bx.toFixed(1)}" x2="${tx.toFixed(1)}" y1="${edgeY.toFixed(1)}" y2="${ty.toFixed(1)}" stroke="${COLOR.outline}" stroke-width="0.7"/><circle class="leader-point" data-bar="${name}" cx="${tx.toFixed(1)}" cy="${ty.toFixed(1)}" r="2.6" fill="${dotColor}"/><circle cx="${bx.toFixed(1)}" cy="${by.toFixed(1)}" r="11" fill="#fff" stroke="${COLOR.outline}"/><text x="${bx.toFixed(1)}" y="${(by + 3).toFixed(1)}" font-size="9" text-anchor="middle" fill="${COLOR.outline}">${name}</text></g>`;
  };
  const yTop = 40;
  const zB11 = js.length > 0 ? fs.cBottom + js[0] * fs.sV : fs.cBottom;
  const zB12 = zB11 + dB10;
  parts.push(bubble('B5', xa + 12, yTop, xa + 12, y(z.B5), COLOR.b5));
  parts.push(bubble('B12', xb - 80, yTop, xb, y(zB12), COLOR.b12));
  parts.push(bubble('B11', xb - 12, yTop + 0, x(xsL[xsL.length - 2]), y(zB11), COLOR.b11));
  parts.push(bubble('B10-2', X0 - 18, y(fs.cBottom + (levels - 1) * fs.sV / 2), x(-L / 2 + depth2), y(fs.cBottom + (levels - 1) * fs.sV / 2), COLOR.b10));

  // Legend and units note.
  const yLeg = 352;
  parts.push(`<line x1="20" x2="44" y1="${yLeg}" y2="${yLeg}" stroke="${COLOR.b5}" stroke-width="1.6"/>${text(50, yLeg + 3, '주철근 (B5–B8)', 'start', COLOR.outline)}`);
  parts.push(`<circle cx="180" cy="${yLeg}" r="2.6" fill="${COLOR.b14}"/>${text(188, yLeg + 3, '직각·보조 (B1–B4)', 'start', COLOR.outline)}`);
  parts.push(`<line x1="330" x2="330" y1="${yLeg - 8}" y2="${yLeg + 8}" stroke="${COLOR.b9}" stroke-width="1"/>${text(338, yLeg + 3, '전단·띠 (B9)', 'start', COLOR.outline)}`);
  parts.push(`<circle cx="20" cy="${yLeg + 22}" r="2.2" fill="${COLOR.b10}"/>${text(28, yLeg + 25, '측면 수평 (B10-1 · B10-2)', 'start', COLOR.outline)}`);
  parts.push(`<line x1="250" x2="274" y1="${yLeg + 22}" y2="${yLeg + 22}" stroke="${COLOR.b11}" stroke-width="1.2" stroke-dasharray="6 3"/>${text(280, yLeg + 25, '조립 (B11·B12)', 'start', COLOR.outline)}`);
  parts.push(text(20, yLeg + 48, '치수 mm · 높이 방향은 실제 비율 · 다리 생략 · 기준: 확대기초 하면 0', 'start', COLOR.outline));

  return `<svg viewBox="0 0 600 430" width="600" height="430" role="img" aria-label="확대기초 교각축 단면 (길이 L)"><g transform="translate(0 20)">${parts.join('')}</g></svg>`;
}