// 终端里把盘面画成字符图，方便设计时看形状。只给工具用。
import type { Board } from '../src/board';
import { clueLabel, hasClue } from '../src/clue';

/**
 * 每个单位格 4 字符宽。1×1 显示 id（或线索），大格用同一个标记铺满，空洞是 '.'。
 * 传 path 时改为显示步号。
 */
export function renderAscii(board: Board, path?: number[]): string {
  const stepOf = new Map<number, number>();
  path?.forEach((c, i) => stepOf.set(c, i + 1));
  const lines: string[] = [];
  for (let y = 0; y < board.rows; y++) {
    let line = '';
    for (let x = 0; x < board.cols; x++) {
      const ci = board.cellAtUnit(x, y);
      if (ci < 0) {
        line += '  . ';
        continue;
      }
      const c = board.cells[ci];
      let label: string;
      if (path) {
        const s = stepOf.get(ci);
        label = s === undefined ? '?' : String(s);
      } else if (hasClue(c)) {
        label = `[${clueLabel(c)}]`;
      } else {
        label = c.id;
      }
      const big = c.w > 1 || c.h > 1;
      const [ax, ay] = board.anchorUnit(ci);
      const isOrigin = x === ax && y === ay;
      const text = big && !isOrigin ? (path ? '·' : '·') : label;
      line += text.padStart(3, ' ') + ' ';
    }
    lines.push(line.replace(/\s+$/, ''));
  }
  return lines.join('\n');
}

export function pathToIds(board: Board, path: number[]): string {
  return path.map((c) => board.cells[c].id).join(' → ');
}