import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { parseMaterials, type MaterialRegistry } from '../src/shared/materials';
import { TerrainBitmap } from '../src/shared/terrain/bitmap';

export const ASSETS = resolve(import.meta.dirname, '../assets');

export function realMaterials(): MaterialRegistry {
  return parseMaterials(JSON.parse(readFileSync(resolve(ASSETS, 'materials/materials.json'), 'utf8')));
}

/** Builds a bitmap from ASCII art: '.' = empty, digits = material id, '#' = plate (255). */
export function bitmapFrom(rows: string[]): TerrainBitmap {
  const h = rows.length;
  const w = rows[0].length;
  const bm = new TerrainBitmap(w, h);
  rows.forEach((row, y) => {
    for (let x = 0; x < w; x++) {
      const c = row[x];
      bm.data[y * w + x] = c === '.' ? 0 : c === '#' ? 255 : Number(c);
    }
  });
  return bm;
}