import assert from 'node:assert/strict';
import { test } from 'node:test';
import { HexBoard } from '../src/board';
import type { HexCellDef } from '../src/types';

const c = (id: string, q: number, r: number, clue?: number): HexCellDef => ({ id, q, r, clue });

test('六邻接：中心格有 6 个邻居，角落只有共边的', () => {
  const cells: HexCellDef[] = [c('o', 0, 0)];
  const dirs: Array<[number, number]> = [[1, 0], [1, -1], [0, -1], [-1, 0], [-1, 1], [0, 1]];
  dirs.forEach(([q, r], i) => cells.push(c(`n${i}`, q, r)));
  const b = HexBoard.fromCells(cells);
  assert.equal(b.adj[0].length, 6);
  // 外圈每格：中心 + 两个相邻外圈格
  for (let i = 1; i <= 6; i++) assert.equal(b.adj[i].length, 3);
  // (1,1) 不是 (0,0) 的邻居
  const b2 = HexBoard.fromCells([c('a', 0, 0), c('b', 1, 1)]);
  assert.equal(b2.areAdjacent(0, 1), false);
  assert.equal(b2.isConnected(), false);
});

test('墙去掉一条邻接，几何邻接不变', () => {
  const b = HexBoard.fromCells([c('a', 0, 0), c('b', 1, 0), c('c', 0, 1)], [['a', 'b']]);
  assert.equal(b.areAdjacent(0, 1), false);
  assert.equal(b.isGeoNeighbor(0, 1), true);
  assert.equal(b.isWalled(0, 1), true);
  assert.equal(b.isWalled(1, 0), true);
  assert.equal(b.areAdjacent(0, 2), true);
  assert.equal(b.areAdjacent(1, 2), true);
  assert.equal(b.wallBetween(1, 0)?.index, 0);
  assert.equal(b.withoutWalls().areAdjacent(0, 1), true);
  assert.equal(b.isConnected(), true);
});

test('墙把盘切开 → 不连通', () => {
  const b = HexBoard.fromCells([c('a', 0, 0), c('b', 1, 0)], [['a', 'b']]);
  assert.equal(b.isConnected(), false);
});

test('非法盘抛错：坐标重叠、id 重复、墙不在共边、墙重复、线索越界', () => {
  assert.throws(() => HexBoard.fromCells([c('a', 0, 0), c('b', 0, 0)]), /重叠/);
  assert.throws(() => HexBoard.fromCells([c('a', 0, 0), c('a', 1, 0)]), /重复/);
  assert.throws(() => HexBoard.fromCells([c('a', 0, 0), c('b', 1, 1)], [['a', 'b']]), /共用边/);
  assert.throws(() => HexBoard.fromCells([c('a', 0, 0), c('b', 1, 0)], [['a', 'b'], ['b', 'a']]), /重复/);
  assert.throws(() => HexBoard.fromCells([c('a', 0, 0), c('b', 1, 0)], [['a', 'x']]), /不存在/);
  assert.throws(() => HexBoard.fromCells([c('a', 0, 0, 3), c('b', 1, 0)]), /超出/);
  assert.throws(() => HexBoard.fromCells([c('a', 0, 0, 1), c('b', 1, 0, 1)]), /线索重复/);
});

test('cellAt / cellById / 线索索引', () => {
  const b = HexBoard.fromCells([c('a', -1, 2, 1), c('b', 0, 2, 2)]);
  assert.equal(b.cellAt(-1, 2), 0);
  assert.equal(b.cellAt(5, 5), -1);
  assert.equal(b.cellById('b').index, 1);
  assert.equal(b.startClueCell, 0);
  assert.equal(b.clueCellOfStep.get(2), 1);
});