/**
 * Tests for AccessibilityCollector with mocked AxeBuilder and violations.
 */

import { AccessibilityCollector } from '../../src/plugins/collectors/AccessibilityCollector';
import type { IAction } from '../../src/core/interfaces';

// ─── Helpers ──────────────────────────────────────────────────────────────────

function makeAction(): IAction {
  return { id: 'a1', type: 'click', timestamp: Date.now(), seed: 42, stateId: 'state1' };
}

interface MockViolation {
  id: string;
  impact?: string;
  description: string;
  helpUrl: string;
  nodes: unknown[];
}

// ─── Mock @axe-core/playwright ────────────────────────────────────────────────

const analyzeMock = jest.fn();

jest.mock('@axe-core/playwright', () => {
  return {
    AxeBuilder: jest.fn().mockImplementation(() => ({
      withTags: jest.fn().mockReturnThis(),
      analyze: analyzeMock,
    })),
  };
});

function makeViolations(violations: MockViolation[]) {
  analyzeMock.mockResolvedValue({ violations });
}

// A minimal mock page (AxeBuilder receives the page, evaluate is only used as fallback)
const mockPage = {
  evaluate: jest.fn().mockResolvedValue([]),
};

// ─── Tests ────────────────────────────────────────────────────────────────────

beforeEach(() => {
  analyzeMock.mockReset();
  mockPage.evaluate.mockReset();
  mockPage.evaluate.mockResolvedValue([]);
});

describe('AccessibilityCollector', () => {
  it('returns empty array when disabled', async () => {
    const collector = new AccessibilityCollector({ enabled: false });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', []);
    expect(result).toHaveLength(0);
    expect(analyzeMock).not.toHaveBeenCalled();
  });

  it('returns empty array when no violations found', async () => {
    makeViolations([]);
    const collector = new AccessibilityCollector({ enabled: true });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', [makeAction()]);
    expect(result).toHaveLength(0);
  });

  it('converts serious violations to high severity anomalies', async () => {
    makeViolations([
      {
        id: 'image-alt',
        impact: 'serious',
        description: 'Images must have alternate text',
        helpUrl: 'https://dequeuniversity.com/rules/axe/image-alt',
        nodes: [{ html: '<img src="logo.png">' }],
      },
    ]);

    const collector = new AccessibilityCollector({ enabled: true, minImpact: 'minor' });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', [makeAction()]);

    expect(result).toHaveLength(1);
    expect(result[0]!.type).toBe('accessibility_violation');
    expect(result[0]!.severity).toBe('high');
    expect(result[0]!.description).toContain('Images must have alternate text');
  });

  it('converts critical violations to critical severity', async () => {
    makeViolations([
      {
        id: 'color-contrast',
        impact: 'critical',
        description: 'Elements must have sufficient color contrast',
        helpUrl: 'https://dequeuniversity.com/rules/axe/color-contrast',
        nodes: [{ html: '<p>text</p>' }],
      },
    ]);

    const collector = new AccessibilityCollector({ enabled: true, minImpact: 'minor' });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', []);
    expect(result[0]!.severity).toBe('critical');
  });

  it('converts moderate violations to medium severity', async () => {
    makeViolations([
      {
        id: 'label',
        impact: 'moderate',
        description: 'Form elements must have labels',
        helpUrl: 'https://dequeuniversity.com/rules/axe/label',
        nodes: [{}],
      },
    ]);

    const collector = new AccessibilityCollector({ enabled: true, minImpact: 'minor' });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', []);
    expect(result[0]!.severity).toBe('medium');
  });

  it('filters out violations below minImpact', async () => {
    makeViolations([
      {
        id: 'link-name',
        impact: 'minor',
        description: 'Links must have discernible text',
        helpUrl: 'https://dequeuniversity.com/rules/axe/link-name',
        nodes: [{}],
      },
    ]);

    // minImpact = 'serious' → minor is ignored
    const collector = new AccessibilityCollector({ enabled: true, minImpact: 'serious' });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', []);
    expect(result).toHaveLength(0);
  });

  it('returns multiple anomalies for multiple violations above threshold', async () => {
    makeViolations([
      { id: 'v1', impact: 'serious', description: 'Violation 1', helpUrl: 'h1', nodes: [{}] },
      { id: 'v2', impact: 'critical', description: 'Violation 2', helpUrl: 'h2', nodes: [{}, {}] },
      { id: 'v3', impact: 'moderate', description: 'Violation 3', helpUrl: 'h3', nodes: [{}] },
    ]);

    const collector = new AccessibilityCollector({ enabled: true, minImpact: 'moderate' });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', []);

    expect(result).toHaveLength(3);
    const severities = result.map((a) => a.severity);
    expect(severities).toContain('high');
    expect(severities).toContain('critical');
    expect(severities).toContain('medium');
  });

  it('handles AxeBuilder failure gracefully (returns empty)', async () => {
    analyzeMock.mockRejectedValue(new Error('axe internal error'));

    // Also make the fallback page.evaluate fail
    mockPage.evaluate.mockRejectedValue(new Error('page not available'));

    const collector = new AccessibilityCollector({ enabled: true });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', []);
    expect(Array.isArray(result)).toBe(true);
    expect(result).toHaveLength(0);
  });

  it('includes rule id, node count, and helpUrl in evidence rawErrors', async () => {
    makeViolations([
      {
        id: 'button-name',
        impact: 'critical',
        description: 'Buttons must have discernible text',
        helpUrl: 'https://dequeuniversity.com/rules/axe/button-name',
        nodes: [{}, {}, {}],
      },
    ]);

    const collector = new AccessibilityCollector({ enabled: true, minImpact: 'minor' });
    const result = await collector.collect(mockPage as never, 'state1', 'sess1', []);

    const evidence = result[0]!.evidence.rawErrors ?? [];
    expect(evidence.some((e) => e.includes('button-name'))).toBe(true);
    expect(evidence.some((e) => e.includes('3'))).toBe(true);
    expect(evidence.some((e) => e.includes('dequeuniversity'))).toBe(true);
  });

  it('sets correct observationId and actionTrace on anomaly', async () => {
    makeViolations([
      { id: 'v', impact: 'serious', description: 'Desc', helpUrl: 'h', nodes: [{}] },
    ]);

    const actions = [makeAction()];
    const collector = new AccessibilityCollector({ enabled: true, minImpact: 'minor' });
    const result = await collector.collect(mockPage as never, 'my-state-id', 'sess1', actions);

    expect(result[0]!.observationId).toBe('my-state-id');
    expect(result[0]!.actionTrace).toBe(actions);
  });
});