import { ContentExtractor } from '../src/indexing-pipeline/extraction';
import { ContentNormalizer } from '../src/indexing-pipeline/normalization';
import { ContentVectorizer } from '../src/indexing-pipeline/vectorization';
import { IndexingPipeline } from '../src/indexing-pipeline/pipeline';

// Mock VaultFile interface for testing
interface MockVaultFile {
  basename: string;
  path: string;
}

describe('Indexing Pipeline Components', () => {
  describe('ContentExtractor', () => {
    let extractor: ContentExtractor;

    beforeEach(() => {
      extractor = new ContentExtractor();
    });

    it('should extract frontmatter correctly', () => {
      const content = `---
title: Test Title
tags: algorithm, programming
date: 2023-01-01
---

# Heading

Content here`;

      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);

      expect(extracted.frontmatter.title).toBe('Test Title');
      expect(extracted.frontmatter.tags).toBe('algorithm, programming');
      expect(extracted.frontmatter.date).toBe('2023-01-01');
      expect(extracted.headings).toContain('Heading');
    });

    it('should extract headings correctly', () => {
      const content = `# Heading 1
## Heading 2
### Heading 3

Content`;

      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);

      expect(extracted.headings).toEqual(['Heading 1', 'Heading 2', 'Heading 3']);
    });

    it('should extract embedded code blocks', () => {
      const content = `# Code Example

\`\`\`javascript
console.log('hello world');
\`\`\`

Some content`;

      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);

      expect(extracted.embeddedCodeBlocks).toHaveLength(1);
      expect(extracted.embeddedCodeBlocks[0]).toContain('console.log');
    });

    it('should extract first paragraph', () => {
      const content = `First paragraph here.

Second paragraph here.

# Heading`;

      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);

      expect(extracted.firstParagraph).toBe('First paragraph here.');
    });

    it('should extract raw text correctly', () => {
      const content = `---
title: Test
---

# Heading

Content with **bold** and [link](url).

\`\`\`javascript
code
\`\`\``;

      const rawText = extractor.extractRawText(content);
      expect(rawText).not.toContain('---');
      expect(rawText).not.toContain('# Heading');
      expect(rawText).not.toContain('```javascript');
      expect(rawText).toContain('Content with bold and link');
    });
  });

  describe('ContentNormalizer', () => {
    let normalizer: ContentNormalizer;
    let extractor: ContentExtractor;

    beforeEach(() => {
      normalizer = new ContentNormalizer();
      extractor = new ContentExtractor();
    });

    it('should normalize frontmatter dates to ISO format', () => {
      const content = `---
title: Test
date: 2023-01-01
created: 2023-06-15
updated: invalid-date
tags: algorithm
---

Content`;

      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);
      const normalized = normalizer.normalize(extracted);

      expect(normalized.frontmatter.date).toBe('2023-01-01T00:00:00.000Z');
      expect(normalized.frontmatter.created).toBe('2023-06-15T00:00:00.000Z');
      expect(normalized.frontmatter.updated).toBe('invalid-date'); // Should preserve invalid dates
    });

    it('should convert tags to array format', () => {
      const content = `---
title: Test
tags: algorithm, programming, javascript
---

Content`;

      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);
      const normalized = normalizer.normalize(extracted);

      expect(normalized.frontmatter.tags).toEqual(['algorithm', 'programming', 'javascript']);
    });

    it('should calculate word count correctly', () => {
      const content = `# Title

This is a test document with several words to count.
It has multiple sentences and words to make it longer.`;

      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);
      const normalized = normalizer.normalize(extracted);

      expect(normalized.wordCount).toBeGreaterThan(0);
    });

    it('should extract tokens correctly', () => {
      const content = `# Test Document

This is a test document with important keywords.`;

      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);
      const normalized = normalizer.normalize(extracted);

      expect(normalized.tokens).toContain('test');
      expect(normalized.tokens).toContain('document');
      expect(normalized.tokens).toContain('important');
      expect(normalized.tokens).toContain('keywords');
    });

    it('should extract title correctly', () => {
      const content = `# Test Document

Content`;

      const file: MockVaultFile = { basename: 'test.md', path: 'test.md' };
      const extracted = extractor.extractFromFile(file, content);
      const normalized = normalizer.normalize(extracted);

      expect(normalized.title).toBe('test');
    });
  });

  describe('ContentVectorizer', () => {
    let vectorizer: ContentVectorizer;

    beforeEach(() => {
      vectorizer = new ContentVectorizer({
        model: 'nomic-embed-text',
        ollamaUrl: 'http://localhost:11434',
      });
    });

    it('should create a proper prompt from content chunk', () => {
      const mockChunk = {
        id: 'test',
        path: 'test.md',
        title: 'Test',
        content: 'Test content',
        tokens: ['test', 'content'],
        headings: ['Heading'],
        frontmatter: { tags: ['test'] },
        firstParagraph: 'First paragraph',
        wordCount: 2,
        chunkIndex: 0,
        chunkSize: 100,
      };

      const prompt = (vectorizer as any).createPrompt(mockChunk);

      expect(prompt).toContain('Test');
      expect(prompt).toContain('First paragraph');
      expect(prompt).toContain('Heading');
      // Frontmatter is no longer included in embedding prompts
    });

    // Note: Actual embedding tests would require mocking fetch or integration testing
    it('should handle vectorization errors gracefully', async () => {
      // This test would require mocking fetch to simulate error responses
      // For now, we're just ensuring the method exists and doesn't crash
      const mockChunk = {
        id: 'test',
        path: 'test.md',
        title: 'Test',
        content: 'Test content',
        tokens: ['test', 'content'],
        headings: ['Heading'],
        frontmatter: { tags: ['test'] },
        firstParagraph: 'First paragraph',
        wordCount: 2,
        chunkIndex: 0,
        chunkSize: 100,
      };

      // Mock fetch to simulate an error
      const originalFetch = global.fetch;
      (global.fetch as any) = jest.fn().mockRejectedValue(new Error('Network error'));

      try {
        const result = await vectorizer.vectorize(mockChunk);
        expect(result).toEqual([]);
      } finally {
        global.fetch = originalFetch;
      }
    });
  });

  describe('IndexingPipeline', () => {
    let pipeline: IndexingPipeline;

    beforeEach(() => {
      pipeline = new IndexingPipeline({
        ollamaUrl: 'http://localhost:11434',
        embeddingModel: 'nomic-embed-text',
      });
    });

    it('should process files through the pipeline', async () => {
      const file: MockVaultFile = { basename: 'test', path: 'test.md' };
      const content = `---
title: Test Document
tags: test, example
---

# Introduction

This is a test document for pipeline processing.`;

      const result = await pipeline.processFile(file, content);

      expect(result).not.toBeNull();
      expect(result?.title).toBe('test');
      expect(result?.path).toBe('test.md');
      expect(result?.content).toContain('This is a test document for pipeline processing');
    });

    it('should handle processing errors gracefully', async () => {
      const file: MockVaultFile = { basename: 'test', path: 'test.md' };

      const result = await pipeline.processFile(file, '');

      // Should not crash, but might return null or incomplete result
      expect(result).toBeNull(); // Empty content should return null
    });

    it('should process files in batches', async () => {
      const files: MockVaultFile[] = [
        { basename: 'file1', path: 'file1.md' },
        { basename: 'file2', path: 'file2.md' },
      ];

      const fileContents = {
        'file1.md': '# File 1\n\nContent 1',
        'file2.md': '# File 2\n\nContent 2',
      };

      const results = await pipeline.processFilesInBatches(files, fileContents, 1);

      expect(results).toHaveLength(2);
      expect(results[0].title).toBe('file1');
      expect(results[1].title).toBe('file2');
    });
  });
});