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

/**
 * 확대기초 · 교각축 직각 단면 (폭 W) (승인 2026-10-26, 추천안 1·2단계). A cut across the footing width: horizontal = W, vertical = height
 * from the 하면 at true scale. Every mark comes from the same functions as the rebar table and the 3D view:
 * - B5–B8 teal lines (bars along W), B1–B4 orange points on the grid along W, B9 purple lines per row,
 * - B10-1 green points at both W faces per level, B11 grey dashed lines per assembly level, B12 grey points on its W grid.
 * Legs are not drawn; the B6 leg length is noted in the figure. The column and the piles are shown as context.
 * Each mark carries data-bar="<철근 번호>" so a bubble can highlight its bars (철근표 강조와 같은 방식).
 */
const COLOR = {
  outline: '#55606E',
  b5: '#0F5C66',
  b14: '#B4531F',
  b9: '#6B3FA0',
  b10: '#2E7D32',
  b11: '#55606E',
  b12: '#55606E',
  dim: '#B42318',
  column: '#B08D57',
  pile: '#8898aa',
};
const W_PX = 380;
const X0 = 60;
/** Height of the 하면 (z = 0) in the view; the figure is drawn at true scale (kY = kX). */
const Y0 = 230;

export function footingSectionSvg(model: PierModel): string {
  const foot = model.footings[0];
  if (!foot) return '<svg viewBox="0 0 560 360" width="560" height="360" 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 W = foot.width * 1000;
  const H = (foot.top - foot.bottom) * 1000;
  const kX = W_PX / W;
  const kY = kX;
  const cx = X0 + W_PX / 2;
  const x = (mm: number) => cx + mm * kX;
  const y = (z: number) => Y0 - z * kY;
  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="${color}" stroke-width="1"/>`;
  // Dimension and note text has a white halo (paint-order stroke) so that leader lines under it stay readable.
  const text = (xx: number, yy: number, s: string, anchor = 'start', fill = COLOR.outline) =>
    `<text x="${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 on W, above the footing) and the piles (below, one stub per distinct W position).
  const colD = model.columnDiameterMm;
  parts.push(`<rect class="column" x="${x(-colD / 2).toFixed(1)}" y="${y(H) - 36}" width="${(colD * kX).toFixed(1)}" height="36" fill="#F2E8D5" stroke="${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 n of [...new Set(piles.map((p) => Math.round(p.n * 1000)))]) {
    const d = (piles.find((p) => Math.round(p.n * 1000) === n)?.diameter ?? 0.6) * 1000;
    parts.push(`<rect class="pile" x="${(x(n) - d * kX / 2).toFixed(1)}" y="${Y0}" width="${Math.max(3, d * kX).toFixed(1)}" height="26" fill="${COLOR.pile}" stroke="#3b4656" stroke-width="0.6"/>`);
  }

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

  // B5–B8: teal lines along W between the covers. B5 at the top, B6 and B8 at the 하면 1단, B7 at the 하면 2단.
  const xa = x(-W / 2 + fs.cSide);
  const xb = x(W / 2 - fs.cSide);
  parts.push(line('b5', 'B5', xa, xb, y(z.B5), COLOR.b5, 1.6));
  parts.push(line('b5', 'B6', xa, xb, y(z.B68), COLOR.b5, 1.2));
  parts.push(line('b5', 'B7', xa, xb, y(z.B7), COLOR.b5, 1.2));
  parts.push(line('b5', 'B8', xa, xb, y(z.B68), COLOR.b5, 1.2));

  // B1–B4 on the grid along W (교각축, orange points): odd grid positions carry B1, B2 and B3; even carry B4 (as bottomBars).
  const xs = gridPositions(W, fs, 'sAxis');
  xs.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));
    }
  });

  // Outermost columns (승인 2026-10-26, 추천): B1·B2·B3·B4 all sit in the first and last grid column (확대기초철근 (1).md §3, §5).
  // The missing ones are drawn as 'ext' points (they do not change the table counts). Their top (B1) and bottom (B2·B4) runs extend
  // to the side cover c_s, and a leg line at the cover runs from the 하면 1단 (B2) up to the B1 height.
  const xSideL = x(-W / 2 + fs.cSide);
  const xSideR = x(W / 2 - fs.cSide);
  const last = xs.length - 1;
  for (const i of [0, last]) {
    const drawnHere = i % 2 === 1 ? ['B1', 'B2', 'B3'] : ['B4'];
    const xx = x(xs[i]);
    for (const [name, zz] of [['B1', z.B1], ['B2', z.B24], ['B3', z.B3], ['B4', z.B24]] as const) {
      if (!drawnHere.includes(name)) parts.push(dot('ext', name, xx, y(zz), COLOR.b14));
    }
    const xSide = i === 0 ? xSideL : xSideR;
    parts.push(line('ext', 'B1', xx, xSide, y(z.B1), COLOR.b14, 1));
    parts.push(line('ext', 'B2', xx, xSide, y(z.B24), COLOR.b14, 1));
    parts.push(vline('leg', 'B2', xSide, y(z.B1), y(z.B24), COLOR.b14));
  }

  // B9: one purple vertical line per row along W (the rows of b9Bars).
  const b9 = b9Bars(L, W, [], 2000, fs);
  for (const n of [...new Set(b9.bars.map((b) => b.n))]) parts.push(vline('b9', 'B9', x(n), y(z.B24), y(z.B5), COLOR.b9));

  // B10-1: green points at both W faces, one per level above the lowest (8 of 9 levels), at the side depth of the table.
  const levels = b10Levels(H, fs);
  const dB1 = sideDepth(NOMINAL_DIAMETER.S29, NOMINAL_DIAMETER.S19, fs);
  // The lowest level is removed (승인 2026-10-26): the 하면 1단 B2·B4 take its place at the corner.
  for (let j = 1; j < levels; j++) {
    const zj = fs.cBottom + j * fs.sV;
    parts.push(dot('b10', 'B10-1', x(-W / 2 + dB1), y(zj), COLOR.b10, 2.2));
    parts.push(dot('b10', 'B10-1', x(W / 2 - dB1), y(zj), COLOR.b10, 2.2));
  }

  // B11: grey dashed lines per assembly level. B12: grey points on its W grid, every k·s, on the even grid (1단계 규칙).
  const js = assemblyJs(H, fs);
  const dB10 = NOMINAL_DIAMETER.S19;
  js.forEach((j, idx) => {
    const zA = fs.cBottom + j * fs.sV;
    parts.push(line('b11', 'B11', xa, xb, y(zA), COLOR.b11, 1.2, '6 3'));
    const xsB12 = gridPositions(W, fs, 'sAxis');
    for (const i of assemblyGridIndices(xsB12.length - 1, fs.kB12, idx)) parts.push(dot('b12', 'B12', x(xsB12[i]), y(zA + dB10), COLOR.b12, 2.2));
  });

  // Dimensions: the width line with ticks and the grid string, and the right-hand heights.
  const g = grid(W, fs, 'sAxis');
  const yDim = Y0 + 40;
  parts.push(`<line x1="${x(-W / 2).toFixed(1)}" x2="${x(W / 2).toFixed(1)}" y1="${yDim}" y2="${yDim}" stroke="${COLOR.dim}" stroke-width="0.8"/>`);
  parts.push(tick(x(-W / 2), yDim) + tick(x(W / 2), yDim));
  // Edge covers sit outside the dimension ends; the grid pieces sit on the first row, spread apart so they do not run together.
  parts.push(text(x(-W / 2) - 5, yDim + 14, `${fs.cSide}`, 'end', COLOR.dim));
  parts.push(text(x(W / 2) + 5, yDim + 14, `${fs.cSide}`, 'start', COLOR.dim));
  parts.push(text(x(-W / 2 + fs.cSide) + 2, yDim + 14, `${g.e.toFixed(1)}`, 'start', COLOR.dim));
  parts.push(text(x(W / 2 - fs.cSide) - 2, yDim + 14, `${g.e.toFixed(1)}`, 'end', COLOR.dim));
  parts.push(text(cx, yDim - 6, `${g.n}@${fs.sAxis}=${g.G}`, 'middle', COLOR.dim));
  parts.push(text(cx, 20, `교각축 직각 단면 · 폭 ${W.toFixed(0)}`, 'middle', '#1F2937'));
  const xr = X0 + W_PX + 18;
  parts.push(`<line x1="${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, `${fs.cBottom}`, 'start', COLOR.dim));
  // B6 leg note in the right margin, with a leader to the B6 leg's end at the B6 height (B6 다리 → B5 높이, from the 하면 1단 up to B5).
  const yNote = y(H) - 14;
  parts.push(`<line class="b6note" x1="${(xr + 4).toFixed(1)}" x2="${xb.toFixed(1)}" y1="${(yNote + 4).toFixed(1)}" y2="${y(z.B68).toFixed(1)}" stroke="${COLOR.b5}" stroke-width="0.7"/>`);
  parts.push(text(xr + 6, yNote, 'B6 다리 → B5', 'start', COLOR.b5));
  parts.push(text(xr + 6, yNote + 12, `높이 ${(z.B5 - z.B68).toFixed(0)}`, 'start', COLOR.b5));

  // Bubbles outside the outline, spread apart, each with a leader to its bar (the leader carries the same data-bar, so it highlights too).
  const bubble = (name: string, bx: number, by: number, tx: number, ty: number) => {
    const edgeY = by < ty ? by + 11 : by - 11;
    return `<g class="bubble" data-bubble="${name}" style="cursor:pointer"><line class="leader" data-bar="${name}" x1="${bx.toFixed(1)}" x2="${tx.toFixed(1)}" y1="${edgeY.toFixed(1)}" y2="${ty.toFixed(1)}" stroke="${COLOR.outline}" stroke-width="0.7"/><circle cx="${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 yBot = Y0 + 66;
  const zB11 = js.length > 0 ? fs.cBottom + js[0] * fs.sV : fs.cBottom;
  parts.push(bubble('B5', xa + 12, yTop, xa + 12, y(z.B5)));
  parts.push(bubble('B1', x(xs[1]) + 60, yTop, x(xs[1]), y(z.B1)));
  parts.push(bubble('B11', xb - 20, yTop, xb, y(zB11)));
  parts.push(bubble('B10-1', X0 - 18, y(fs.cBottom + (levels - 1) * fs.sV / 2), X0 + 2, y(fs.cBottom + (levels - 1) * fs.sV / 2)));
  parts.push(bubble('B2', cx - 70, yBot, x(xs[1]), y(z.B24)));
  parts.push(bubble('B4', cx, yBot, x(xs[2]), y(z.B24)));
  parts.push(bubble('B3', cx + 70, yBot, x(xs[3]), y(z.B3)));

  // Legend (선 모양별, 삽도 기준) and the units note.
  const yLeg = 330;
  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 (B6 다리는 주석) · 기준: 확대기초 하면 0', 'start', COLOR.outline));

  return `<svg viewBox="0 0 560 360" width="560" height="360" role="img" aria-label="확대기초 교각축 직각 단면">${parts.join('')}</svg>`;
}