// tests/build/tokens-adopted.test.ts — Plan 01-12 Wave 0 RED unit test.
//
// Asserts that the canonical token system (src/shared/tokens.css) exists
// and is adopted by src/popup/style.css with ZERO hex literals remaining.
//
// Polarity at Wave 0 land:
//   (a) GREEN if src/shared/tokens.css already exists (will be RED until
//       Wave 1 Task 2 lands the canonical copy).
//   (b) RED until Wave 4 Task 1 migrates src/popup/style.css to @import
//       tokens.css and replaces hex literals with var(--mks-*) references.
//   (c) RED until Wave 4 Task 1 removes every #[0-9a-fA-F]{3,8} match
//       from src/popup/style.css (loom-palette adoption via tokens).
//
// References:
//   - Plan 01-12 §interfaces (.mks-word definition, R2 Lora substitution)
//   - RESEARCH §1 + §9 (per-surface mini-tokens anti-pattern; collapse
//     into canonical src/shared/tokens.css)

import { describe, expect, it } from 'vitest';
import { existsSync, readFileSync } from 'node:fs';
import { resolve as resolvePath } from 'node:path';

const TOKENS_CSS_PATH = resolvePath(process.cwd(), 'src/shared/tokens.css');
const POPUP_STYLE_PATH = resolvePath(process.cwd(), 'src/popup/style.css');
const WELCOME_STYLE_PATH = resolvePath(process.cwd(), 'src/welcome/welcome.css');
const HEX_LITERAL_REGEX = /#[0-9a-fA-F]{3,8}\b/g;
const TOKENS_IMPORT_REGEX = /@import\s+["']\.\.\/shared\/tokens\.css["']/;

describe('Plan 01-12: tokens.css adoption (canonical token system)', () => {
  it('(a) src/shared/tokens.css exists + parses as readable CSS', () => {
    expect(
      existsSync(TOKENS_CSS_PATH),
      `Expected src/shared/tokens.css at ${TOKENS_CSS_PATH} (RED until Wave 1 Task 2)`,
    ).toBe(true);
    const css = readFileSync(TOKENS_CSS_PATH, 'utf8');
    expect(css.length, 'tokens.css must be non-empty').toBeGreaterThan(100);
    expect(css, 'tokens.css must declare :root with --mks-* tokens').toMatch(/:root\s*\{/);
    expect(css, 'tokens.css must include --mks-font-display token').toMatch(/--mks-font-display\s*:/);
  });

  it('(b) src/popup/style.css imports ../shared/tokens.css', () => {
    expect(existsSync(POPUP_STYLE_PATH), 'src/popup/style.css must exist').toBe(true);
    const css = readFileSync(POPUP_STYLE_PATH, 'utf8');
    expect(
      TOKENS_IMPORT_REGEX.test(css),
      `Expected @import '../shared/tokens.css' in src/popup/style.css (RED until Wave 4 Task 1)`,
    ).toBe(true);
  });

  it('(c) src/popup/style.css has ZERO hex color literals (loom palette via var(--mks-*))', () => {
    const css = readFileSync(POPUP_STYLE_PATH, 'utf8');
    const matches = css.match(HEX_LITERAL_REGEX) ?? [];
    expect(
      matches.length,
      matches.length === 0
        ? 'unreachable'
        : `Expected 0 hex literals in src/popup/style.css; got ${matches.length}: ${matches.join(', ')}\n` +
          `Replace each with var(--mks-*) per D-04 loom palette (Wave 4 Task 1).`,
    ).toBe(0);
  });

  it('(d) src/welcome/welcome.css — if present, has ZERO hex literals (Plan 01-10 conditional)', () => {
    // Conditional: only enforce if Plan 01-10 has landed src/welcome/welcome.css.
    if (!existsSync(WELCOME_STYLE_PATH)) {
      // SKIP without failing; documented in plan as conditional artifact.
      return;
    }
    const css = readFileSync(WELCOME_STYLE_PATH, 'utf8');
    const matches = css.match(HEX_LITERAL_REGEX) ?? [];
    expect(
      matches.length,
      matches.length === 0
        ? 'unreachable'
        : `Expected 0 hex literals in src/welcome/welcome.css; got ${matches.length}: ${matches.join(', ')}`,
    ).toBe(0);
  });
});