import assert from 'node:assert/strict';
import { test } from 'node:test';
import { Board } from '../src/board';
import { bridgeRect, cellRect, cellShapeRects, fitBoard, hitTest } from '../src/layout';
import type { CellDef } from '../src/types';

const c = (id: string, x: number, y: number, w = 1, h = 1, clue?: number): CellDef => ({ id, x, y, w, h, clue });

test('按短边缩放并居中，受 maxUnit 限制', () => {
  const b = Board.fromCells([c('a', 0, 0), c('b', 1, 0), c('c', 2, 0)]);
  const L = fitBoard(b, 390, 600, { padding: 10, maxUnit: 96 });
  assert.equal(L.unit, 96);
  assert.equal(L.width, 288);
  assert.equal(L.originX, (390 - 288) / 2);
  const tall = Board.fromCells([c('a', 0, 0), c('b', 0, 1), c('c', 0, 2), c('d', 0, 3), c('e', 0, 4), c('f', 0, 5)]);
  const L2 = fitBoard(tall, 390, 300, { padding: 0, maxUnit: 200 });
  assert.equal(L2.unit, 50);
});

test('命中测试：格中心命中、缝与死区不命中、空洞不命中', () => {
  const b = Board.fromCells([c('a', 0, 0), c('B', 1, 0, 2, 2), c('h', 0, 2)]);
  const L = fitBoard(b, 300, 300, { padding: 0, maxUnit: 100 });
  const ra = cellRect(b, 0, L);
  assert.equal(hitTest(b, L, ra.x + ra.w / 2, ra.y + ra.h / 2), 0);
  assert.equal(hitTest(b, L, L.originX + 2, L.originY + 2), -1, '角落死区');
  assert.equal(hitTest(b, L, L.originX + 150, L.originY + 150), 1, '2×2 中心');
  assert.equal(hitTest(b, L, L.originX + 50, L.originY + 150), -1, '空洞 (0,1)');
  assert.equal(hitTest(b, L, -5, -5), -1);
});

test('桥矩形横跨缝并落在共享边中点', () => {
  const b = Board.fromCells([c('a', 0, 0), c('B', 1, 0, 2, 2)]);
  const L = fitBoard(b, 300, 200, { padding: 0, maxUnit: 100 });
  const br = bridgeRect(b, 0, 1, L)!;
  assert.ok(br);
  assert.ok(Math.abs(br.x + br.w / 2 - (L.originX + 100)) < 1e-6, '中心在 x=1 的边上');
  assert.ok(Math.abs(br.y + br.h / 2 - (L.originY + 50)) < 1e-6, '共享边 y∈[0,1] 的中点');
  assert.equal(bridgeRect(b, 1, 1, L), null);
});

test('异形格绘制矩形：单位 + 接缝', () => {
  // L4 占 (1,1)(1,2)(1,3)(2,3)：4 个单位矩形 + 3 条内部缝（两竖一横）
  // 补一个 (0,0) 的格钉住原点，免得 L 被平移
  const b = Board.fromCells([
    { id: 'L', x: 1, y: 1, w: 2, h: 3, shape: [[0, 0], [0, 1], [0, 2], [1, 2]] },
    c('z', 0, 0),
  ]);
  const L = fitBoard(b, 300, 300, { padding: 0, maxUnit: 100 });
  const { units, seams } = cellShapeRects(b, 0, L);
  assert.equal(units.length, 4);
  assert.equal(seams.length, 3);
  const half = L.gap / 2;
  // 横缝：(1,3)→(2,3)，跨过 x=2 的竖缝，向两侧单位内各延长一个圆角半径（盖住圆角缺口）
  assert.deepEqual(
    seams.find((r) => r.w === L.gap + 2 * L.radius),
    {
      x: L.originX + 2 * L.unit - half - L.radius,
      y: L.originY + 3 * L.unit + half,
      w: L.gap + 2 * L.radius,
      h: L.unit - L.gap,
    },
  );
  // 竖缝：(1,1)→(1,2)，跨过 y=2 的横缝，同样上下延长
  assert.deepEqual(
    seams.find((r) => r.h === L.gap + 2 * L.radius && r.y === L.originY + 2 * L.unit - half - L.radius),
    {
      x: L.originX + L.unit + half,
      y: L.originY + 2 * L.unit - half - L.radius,
      w: L.unit - L.gap,
      h: L.gap + 2 * L.radius,
    },
  );
  // 单位矩形与 cellRect 对单个 1×1 的算法一致
  const u0 = units[0];
  assert.deepEqual(u0, { x: L.originX + L.unit + half, y: L.originY + L.unit + half, w: L.unit - L.gap, h: L.unit - L.gap });
});