/**
 * Tests for design-parser.mjs — frontmatter + body extraction.
 * Run with: node --test tests/design-parser.test.mjs
 */

import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import { assessCoverage, parseDesignMd } from '../skill/scripts/lib/design-parser.mjs';

describe('parseDesignMd frontmatter branch', () => {
  it('returns null frontmatter when the file has no YAML header', () => {
    const md = `# Design System: Demo

## 1. Overview

Some prose.
`;
    const model = parseDesignMd(md);
    assert.equal(model.schemaVersion, 2);
    assert.equal(model.frontmatter, null);
    assert.equal(model.title, 'Design System: Demo');
  });

  it('parses a Stitch-shaped frontmatter and strips it from the body', () => {
    const md = `---
name: Demo System
description: A quiet editorial look.
colors:
  primary: "#b8422e"
  neutral-bg: "#faf7f2"
typography:
  display:
    fontFamily: "Cormorant Garamond, Georgia, serif"
    fontWeight: 300
    lineHeight: 1
  body:
    fontFamily: "Inter, sans-serif"
rounded:
  sm: "4px"
  md: "8px"
components:
  button-primary:
    backgroundColor: "{colors.primary}"
    textColor: "{colors.neutral-bg}"
    rounded: "{rounded.sm}"
---

# Design System: Demo

## 1. Overview

Opening prose.
`;
    const model = parseDesignMd(md);
    assert.equal(model.schemaVersion, 2);
    assert.equal(model.title, 'Design System: Demo');
    assert.ok(model.frontmatter);
    assert.equal(model.frontmatter.name, 'Demo System');
    assert.equal(model.frontmatter.description, 'A quiet editorial look.');
    assert.equal(model.frontmatter.colors.primary, '#b8422e');
    assert.equal(model.frontmatter.colors['neutral-bg'], '#faf7f2');
    assert.equal(model.frontmatter.typography.display.fontFamily, 'Cormorant Garamond, Georgia, serif');
    assert.equal(model.frontmatter.typography.display.fontWeight, 300);
    assert.equal(model.frontmatter.typography.display.lineHeight, 1);
    assert.equal(model.frontmatter.rounded.md, '8px');
    assert.equal(model.frontmatter.components['button-primary'].backgroundColor, '{colors.primary}');
  });

  it('recovers gracefully when frontmatter has no closing marker', () => {
    // No `---` terminator: the whole file is treated as body, not partial
    // frontmatter. The H1 title still resolves from the body.
    const md = `---
this is not valid yaml : : :
no closing marker
# Design System: Broken

## 1. Overview

Prose.
`;
    const model = parseDesignMd(md);
    assert.equal(model.frontmatter, null);
    assert.equal(model.title, 'Design System: Broken');
  });

  it('ignores line-only comments but preserves unquoted hex values', () => {
    const md = `---
# Top-level comment
colors:
  primary: #b8422e
  # mid-block comment
  accent: "#ec4899"
---

# Design System: Commented

## 1. Overview

Prose.
`;
    const model = parseDesignMd(md);
    assert.equal(model.frontmatter.colors.primary, '#b8422e');
    assert.equal(model.frontmatter.colors.accent, '#ec4899');
  });

  it('strips inline comments after quoted OKLCH values', () => {
    const md = `---
colors:
  kinpaku-gold: "oklch(84% 0.19 80.46)"       # primary accent
  gold-hairline: "oklch(58% 0.065 82 / 0.32)" # default rule
---

# Design System: Kinpaku

## 1. Overview

Prose.
`;
    const model = parseDesignMd(md);
    assert.equal(model.frontmatter.colors['kinpaku-gold'], 'oklch(84% 0.19 80.46)');
    assert.equal(model.frontmatter.colors['gold-hairline'], 'oklch(58% 0.065 82 / 0.32)');
  });

  it('normalizes quoted YAML keys in token maps', () => {
    const md = `---
rounded:
  "2xl": "80px"
  '3xl': "96px"
colors:
  "brand-gold": "#d9a531"
---

# Design System: Quoted Keys

## 1. Overview

Prose.
`;
    const model = parseDesignMd(md);
    assert.equal(model.frontmatter.rounded['2xl'], '80px');
    assert.equal(model.frontmatter.rounded['3xl'], '96px');
    assert.equal(model.frontmatter.colors['brand-gold'], '#d9a531');
    assert.equal(model.frontmatter.rounded['"2xl"'], undefined);
  });

  it('unescapes quote escapes inside quoted scalars (issue #428)', () => {
    const md = `---
typography:
  body:
    fontFamily: "\\"IBM Plex Sans\\", system-ui, sans-serif"
name: 'It''s quiet'
empty: "
---

# Design System: Escaped

## 1. Overview

Prose.
`;
    const model = parseDesignMd(md);
    // YAML double-quoted scalars process backslash escapes.
    assert.equal(model.frontmatter.typography.body.fontFamily, '"IBM Plex Sans", system-ui, sans-serif');
    // Single-quoted scalars escape the quote by doubling it.
    assert.equal(model.frontmatter.name, "It's quiet");
    // A lone quote satisfies startsWith and endsWith at once; keep it literal
    // instead of slicing it into an empty string.
    assert.equal(model.frontmatter.empty, '"');
  });

  it('decodes hex, Unicode, and whitespace escapes in double-quoted scalars', () => {
    const md = `---
colors:
  accent: "\\x23b8422e"
typography:
  accent:
    fontFamily: "S\\u00f6hne, sans-serif"
  label:
    fontFamily: "IBM\\ Plex\\ Serif, serif"
  mono:
    fontFamily: "Space\\_Grotesk, sans-serif"
emoji: "\\U0001F44D"
bad-hex: "\\xZZ nope"
bad-range: "\\UFFFFFFFF nope"
---

# Design System: Hex Escapes

## 1. Overview

Prose.
`;
    const model = parseDesignMd(md);
    assert.equal(model.frontmatter.colors.accent, '#b8422e');
    assert.equal(model.frontmatter.typography.accent.fontFamily, 'Söhne, sans-serif');
    // \ (escaped space) and \_ (non-breaking space) are valid YAML escapes.
    assert.equal(model.frontmatter.typography.label.fontFamily, 'IBM Plex Serif, serif');
    assert.equal(model.frontmatter.typography.mono.fontFamily, 'Space\u00a0Grotesk, sans-serif');
    assert.equal(model.frontmatter.emoji, '\u{1F44D}');
    // Malformed or out-of-range sequences stay literal.
    assert.equal(model.frontmatter['bad-hex'], '\\xZZ nope');
    assert.equal(model.frontmatter['bad-range'], '\\UFFFFFFFF nope');
  });
});

describe('parseDesignMd overview branch', () => {
  it('joins wrapped Key Characteristics bullets without leaking continuations into philosophy', () => {
    const md = `# Design System: Example

## Overview

**Creative North Star: "Structured clarity"**

**Key Characteristics:**

- Status remains understandable without relying on color
  alone.
- Navigation controls remain visible when the viewport becomes
  narrow.
`;
    const overview = parseDesignMd(md).overview;

    assert.deepEqual(overview.keyCharacteristics, [
      'Status remains understandable without relying on color alone.',
      'Navigation controls remain visible when the viewport becomes narrow.',
    ]);
    assert.deepEqual(overview.philosophy, []);
  });
});

describe('parseDesignMd named rules', () => {
  it('preserves format precedence while deduplicating later definitions', () => {
    const md = `# Design System: Rules

## Layout

### The "Rhythm" Rule
Ignore this duplicate heading definition.

### The Fallback Principle
Use the heading definition.

### Named Rules
- **The Fallback Principle:** Ignore this duplicate bullet definition.
- **The Layering Principle:** Use the bullet definition.

**The Rhythm Rule.** Keep the first definition.
`;

    assert.deepEqual(parseDesignMd(md).layout.rules, [
      { name: 'The Rhythm Rule', body: 'Keep the first definition.' },
      { name: 'The Fallback Principle', body: 'Use the heading definition.' },
      { name: 'The Layering Principle', body: 'Use the bullet definition.' },
    ]);
  });
});

describe('parseDesignMd canonical sections', () => {
  it('preserves content and named rules from all eight canonical sections', () => {
    const md = `# Design System: Complete

## Overview

**Creative North Star: "Structured clarity"**

## Colors

### Primary
- **Ink** (#111111): Primary text.

## Typography

**Body Font:** Inter (with sans-serif)

## Layout: Responsive rhythm

Primary regions use a twelve-column grid that collapses to one column on narrow screens.

### Named Rules
**The Spatial Hierarchy Rule.** Primary content must remain visually dominant.

## Elevation & Depth

Surfaces use tonal layering instead of shadows.

## Shapes

Selected objects use a double outline and clipped corners.

### The "Recognizable Silhouette" Rule
Repeated geometry must remain recognizable without color.

## Components

### Button
- **Primary:** Uses the accent color.

## Do's and Don'ts

### Do
- Preserve the spatial hierarchy.

### Don't
- Flatten every surface.
`;
    const model = parseDesignMd(md);

    assert.equal(model.layout.subtitle, 'Responsive rhythm');
    assert.equal(
      model.layout.description,
      'Primary regions use a twelve-column grid that collapses to one column on narrow screens.',
    );
    assert.deepEqual(model.layout.rules, [{
      name: 'The Spatial Hierarchy Rule',
      body: 'Primary content must remain visually dominant.',
    }]);
    assert.equal(model.shapes.description, 'Selected objects use a double outline and clipped corners.');
    assert.deepEqual(model.shapes.rules, [{
      name: 'The Recognizable Silhouette Rule',
      body: 'Repeated geometry must remain recognizable without color.',
    }]);

    const coverage = assessCoverage(model);
    assert.deepEqual(
      Object.entries(coverage).filter(([, v]) => v === 'missing').map(([k]) => k),
      [],
      'a section present in the markdown must not be reported as missing',
    );
    assert.deepEqual(Object.keys(coverage), [
      'overview',
      'colors',
      'typography',
      'layout',
      'elevation',
      'shapes',
      'components',
      'dosDonts',
    ]);
    assert.deepEqual(coverage.layout, { description: true, rules: 1 });
    assert.deepEqual(coverage.shapes, { description: true, rules: 1 });
  });
});