import fs from 'node:fs';
import path from 'node:path';

import {describe, expect, it} from 'vitest';

const themePath = path.resolve(
  process.cwd(),
  'packages/shared/src/theme.css',
);

function getCssBlock(source: string, selector: string) {
  const selectorIndex = source.indexOf(selector);
  expect(selectorIndex, `${selector} should exist`).toBeGreaterThanOrEqual(0);

  const openBraceIndex = source.indexOf('{', selectorIndex);
  let depth = 0;
  for (let index = openBraceIndex; index < source.length; index += 1) {
    const char = source[index];
    if (char === '{') {
      depth += 1;
    } else if (char === '}') {
      depth -= 1;
      if (depth === 0) {
        return source.slice(openBraceIndex + 1, index);
      }
    }
  }

  throw new Error(`${selector} block is not closed`);
}

describe('shared platform theme', () => {
  it('exposes the shared platform font stack without fixing its cascade position', () => {
    const css = fs.readFileSync(themePath, 'utf8');
    const platformTheme = getCssBlock(css, '.platform-theme');

    expect(platformTheme).toContain("--platform-font-family: 'Inter'");
    expect(css).not.toContain('.platform-theme,\n.platform-theme *');
  });

  it('keeps the light and dark semantic color contracts', () => {
    const css = fs.readFileSync(themePath, 'utf8');
    const light = getCssBlock(css, '.platform-theme--light');
    const dark = getCssBlock(css, '.platform-theme--dark');

    expect(light).toContain('--platform-accent: #c7653d;');
    expect(light).toContain('linear-gradient(135deg, #df7f40, #b95d3a)');
    expect(light).toContain('--platform-text-strong: #3d1f10;');
    expect(dark).toContain('--platform-accent: #5b6cff;');
    expect(dark).toContain('linear-gradient(135deg, #5b6cff, #3dd9ff)');
    expect(dark).toContain('--platform-text-strong: #ffffff;');
  });
});