import { describe, it, expect } from 'vitest';
import { generateCanaryTxt } from '../src/generators/canary.js';

describe('generateCanaryTxt', () => {
  const testURL = new URL('https://example.com');

  it('generates basic canary with defaults', () => {
    const result = generateCanaryTxt({}, testURL);

    expect(result).toContain('Canonical-URL:');
    expect(result).toContain('Issued:');
    expect(result).toContain('Expires:');
    expect(result).toContain('Statement:');
  });

  it('includes organization name', () => {
    const result = generateCanaryTxt(
      {
        organization: 'Test Corp',
      },
      testURL
    );

    expect(result).toContain('Organization: Test Corp');
  });

  it('includes contact information with mailto prefix', () => {
    const result = generateCanaryTxt(
      {
        contact: 'canary@example.com',
      },
      testURL
    );

    expect(result).toContain('Contact: mailto:canary@example.com');
  });

  it('automatically calculates expiration for daily frequency', () => {
    const result = generateCanaryTxt(
      {
        frequency: 'daily',
        expires: 'auto',
      },
      testURL
    );

    expect(result).toContain('Frequency: daily');
    expect(result).toContain('Expires: ');

    // Extract the date
    const match = result.match(/Expires: (.+)/);
    expect(match).toBeTruthy();

    if (match) {
      const expiresDate = new Date(match[1]);
      const now = new Date();
      const twoDaysFromNow = new Date(now.getTime() + 2 * 24 * 60 * 60 * 1000);

      // Should be approximately 2 days from now (within 1 minute)
      const diff = Math.abs(expiresDate.getTime() - twoDaysFromNow.getTime());
      expect(diff).toBeLessThan(60 * 1000);
    }
  });

  it('automatically calculates expiration for weekly frequency', () => {
    const result = generateCanaryTxt(
      {
        frequency: 'weekly',
        expires: 'auto',
      },
      testURL
    );

    const match = result.match(/Expires: (.+)/);
    if (match) {
      const expiresDate = new Date(match[1]);
      const now = new Date();
      const tenDaysFromNow = new Date(now.getTime() + 10 * 24 * 60 * 60 * 1000);

      const diff = Math.abs(expiresDate.getTime() - tenDaysFromNow.getTime());
      expect(diff).toBeLessThan(60 * 1000);
    }
  });

  it('automatically calculates expiration for monthly frequency', () => {
    const result = generateCanaryTxt(
      {
        frequency: 'monthly',
        expires: 'auto',
      },
      testURL
    );

    const match = result.match(/Expires: (.+)/);
    if (match) {
      const expiresDate = new Date(match[1]);
      const now = new Date();
      const thirtyFiveDaysFromNow = new Date(now.getTime() + 35 * 24 * 60 * 60 * 1000);

      const diff = Math.abs(expiresDate.getTime() - thirtyFiveDaysFromNow.getTime());
      expect(diff).toBeLessThan(60 * 1000);
    }
  });

  it('automatically calculates expiration for quarterly frequency', () => {
    const result = generateCanaryTxt(
      {
        frequency: 'quarterly',
        expires: 'auto',
      },
      testURL
    );

    const match = result.match(/Expires: (.+)/);
    if (match) {
      const expiresDate = new Date(match[1]);
      const now = new Date();
      const oneHundredDaysFromNow = new Date(now.getTime() + 100 * 24 * 60 * 60 * 1000);

      const diff = Math.abs(expiresDate.getTime() - oneHundredDaysFromNow.getTime());
      expect(diff).toBeLessThan(60 * 1000);
    }
  });

  it('automatically calculates expiration for yearly frequency', () => {
    const result = generateCanaryTxt(
      {
        frequency: 'yearly',
        expires: 'auto',
      },
      testURL
    );

    const match = result.match(/Expires: (.+)/);
    if (match) {
      const expiresDate = new Date(match[1]);
      const now = new Date();
      const threeHundredEightyDaysFromNow = new Date(now.getTime() + 380 * 24 * 60 * 60 * 1000);

      const diff = Math.abs(expiresDate.getTime() - threeHundredEightyDaysFromNow.getTime());
      expect(diff).toBeLessThan(60 * 1000);
    }
  });

  it('accepts custom expiration date', () => {
    const customExpires = '2026-01-15T00:00:00Z';
    const result = generateCanaryTxt(
      {
        expires: customExpires,
      },
      testURL
    );

    expect(result).toContain(`Expires: ${customExpires}`);
  });

  it('includes default statements when none provided', () => {
    const result = generateCanaryTxt({}, testURL);

    expect(result).toContain('  - National Security Letters (NSLs)');
    expect(result).toContain('  - FISA court orders');
    expect(result).toContain('  - Gag orders preventing disclosure');
    expect(result).toContain('  - Secret government requests for user data');
    expect(result).toContain('  - Requests to install surveillance capabilities');
  });

  it('supports custom statements as array', () => {
    const result = generateCanaryTxt(
      {
        statements: [
          { type: 'custom1', description: 'Custom order type 1', received: false },
          { type: 'custom2', description: 'Custom order type 2', received: true },
        ],
      },
      testURL
    );

    // Only non-received statements are listed
    expect(result).toContain('  - Custom order type 1');
    // Received statements are NOT included in the output
    expect(result).not.toContain('Custom order type 2');
  });

  it('supports statements as function', () => {
    const result = generateCanaryTxt(
      {
        statements: () => [
          { type: 'dynamic', description: 'Dynamically generated statement', received: false },
        ],
      },
      testURL
    );

    expect(result).toContain('  - Dynamically generated statement');
  });

  it('filters out received statements from output', () => {
    const result = generateCanaryTxt(
      {
        statements: [
          { type: 'test1', description: 'Not received', received: false },
          { type: 'test2', description: 'Received', received: true },
        ],
      },
      testURL
    );

    // Only non-received statements appear
    expect(result).toContain('  - Not received');
    // Received statements are filtered out
    expect(result).not.toContain('Received');
  });

  it('includes additional statement', () => {
    const result = generateCanaryTxt(
      {
        additionalStatement: 'We are committed to transparency and user privacy.',
      },
      testURL
    );

    expect(result).toContain('We are committed to transparency and user privacy.');
  });

  it('includes verification information', () => {
    const result = generateCanaryTxt(
      {
        verification: 'PGP Signature: https://example.com/canary.txt.asc',
      },
      testURL
    );

    expect(result).toContain('Verification: PGP Signature: https://example.com/canary.txt.asc');
  });

  it('includes previous canary reference', () => {
    const result = generateCanaryTxt(
      {
        previousCanary: 'https://example.com/canary-2024-11.txt',
      },
      testURL
    );

    expect(result).toContain('Previous-Canary: https://example.com/canary-2024-11.txt');
  });

  it('includes blockchain proof', () => {
    const result = generateCanaryTxt(
      {
        blockchainProof: {
          network: 'Ethereum',
          address: '0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb',
          txHash: '0xabc123...',
          timestamp: '2024-11-03T12:00:00Z',
        },
      },
      testURL
    );

    expect(result).toContain('Blockchain-Proof: Ethereum:0x742d35Cc6634C0532925a3b844Bc9e7595f0bEb:0xabc123...');
    expect(result).toContain('Blockchain-Timestamp: 2024-11-03T12:00:00Z');
  });

  it('includes personnel duress statement when enabled', () => {
    const result = generateCanaryTxt(
      {
        personnelStatement: true,
      },
      testURL
    );

    expect(result).toContain('Key Personnel Statement: All key personnel with access to');
    expect(result).toContain('infrastructure remain free and under no duress');
  });

  it('excludes personnel statement when disabled', () => {
    const result = generateCanaryTxt(
      {
        personnelStatement: false,
      },
      testURL
    );

    expect(result).not.toContain('Key Personnel Statement');
  });

  it('generates complete canary with all fields', () => {
    const result = generateCanaryTxt(
      {
        organization: 'Example Corp',
        contact: 'canary@example.com',
        frequency: 'monthly',
        expires: '2026-01-15T00:00:00Z',
        statements: [
          { type: 'nsl', description: 'National Security Letters', received: false },
          { type: 'gag', description: 'Gag orders', received: false },
        ],
        additionalStatement: 'We value transparency.',
        verification: 'PGP Signature: https://example.com/canary.txt.asc',
        previousCanary: 'https://example.com/canary-2024-10.txt',
        blockchainProof: {
          network: 'Bitcoin',
          address: 'bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh',
        },
        personnelStatement: true,
      },
      testURL
    );

    expect(result).toContain('Organization: Example Corp');
    expect(result).toContain('Contact: mailto:canary@example.com');
    expect(result).toContain('Frequency: monthly');
    expect(result).toContain('Expires: 2026-01-15T00:00:00Z');
    expect(result).toContain('Previous-Canary: https://example.com/canary-2024-10.txt');
    expect(result).toContain('  - National Security Letters');
    expect(result).toContain('  - Gag orders');
    expect(result).toContain('We value transparency.');
    expect(result).toContain('Verification: PGP Signature');
    expect(result).toContain('Blockchain-Proof: Bitcoin:bc1qxy2kgdygjrsqtzq2n0yrf2493p83kkfjhx0wlh');
    expect(result).toContain('Key Personnel Statement');
  });

  it('formats Issued date as ISO date', () => {
    const result = generateCanaryTxt({}, testURL);

    const match = result.match(/Issued: (.+)/);
    expect(match).toBeTruthy();

    if (match) {
      // Should be valid ISO date
      const date = new Date(match[1]);
      expect(date.toString()).not.toBe('Invalid Date');

      // Should be recent (within 1 minute)
      const now = new Date();
      const diff = Math.abs(date.getTime() - now.getTime());
      expect(diff).toBeLessThan(60 * 1000);
    }
  });

  it('ends with newline', () => {
    const result = generateCanaryTxt({}, testURL);
    expect(result.endsWith('\n')).toBe(true);
  });
});