import { NoteContextBuilder } from '../src/note-context-builder';
import { VaultIndexer } from '../src/vault-indexer';
import { TFile } from 'obsidian';

describe('NoteContextBuilder', () => {
  let builder: NoteContextBuilder;
  let mockVault: any;
  let mockApp: any;
  let mockVaultIndexer: jest.Mocked<VaultIndexer>;

  beforeEach(() => {
    mockVault = {
      getAbstractFileByPath: jest.fn(),
      getMarkdownFiles: jest.fn().mockReturnValue([]),
      cachedRead: jest.fn().mockResolvedValue(''),
    };

    mockApp = {
      workspace: {
        getActiveFile: jest.fn().mockReturnValue(null),
        getActiveViewOfType: jest.fn().mockReturnValue(null),
      },
      metadataCache: {
        getCache: jest.fn().mockReturnValue(null),
        resolvedLinks: {},
      },
    };

    mockVaultIndexer = {
      searchVault: jest.fn().mockResolvedValue([]),
    } as unknown as jest.Mocked<VaultIndexer>;

    builder = new NoteContextBuilder(mockVault, mockApp, mockVaultIndexer);
  });

  describe('extractExplicitMentions', () => {
    it('should extract simple wikilinks', () => {
      const result = builder.extractExplicitMentions('What about [[My Note]]?');
      expect(result).toEqual(['My Note']);
    });

    it('should extract multiple wikilinks', () => {
      const result = builder.extractExplicitMentions('See [[Note A]] and [[Note B]]');
      expect(result).toEqual(['Note A', 'Note B']);
    });

    it('should strip aliases', () => {
      const result = builder.extractExplicitMentions('[[Real Name|Display Name]]');
      expect(result).toEqual(['Real Name']);
    });

    it('should deduplicate mentions', () => {
      const result = builder.extractExplicitMentions('[[Note]] [[Note]]');
      expect(result).toEqual(['Note']);
    });

    it('should return empty array when no wikilinks', () => {
      const result = builder.extractExplicitMentions('Just plain text');
      expect(result).toEqual([]);
    });
  });

  describe('detectScopeIntent', () => {
    it('should detect explicit scope', () => {
      expect(builder.detectScopeIntent('use only this note')).toBe('explicit');
      expect(builder.detectScopeIntent('Just this note please')).toBe('explicit');
    });

    it('should detect related scope', () => {
      expect(builder.detectScopeIntent('include related notes')).toBe('related');
      expect(builder.detectScopeIntent('show me linked notes')).toBe('related');
    });

    it('should default to default', () => {
      expect(builder.detectScopeIntent('hello world')).toBe('default');
    });
  });

  describe('buildContext', () => {
    it('should include explicit mentions', async () => {
      mockVault.getAbstractFileByPath.mockReturnValue({ path: 'Note.md', basename: 'Note' });
      mockVault.getMarkdownFiles.mockReturnValue([{ path: 'Note.md', basename: 'Note' }]);
      mockVault.cachedRead.mockResolvedValue('# Note\nContent');

      const ctx = await builder.buildContext('What about [[Note]]?', 5);
      expect(ctx.explicitMentions.length).toBe(1);
      expect(ctx.explicitMentions[0].title).toBe('Note');
    });

    it('should include open note when available', async () => {
      const activeFile = { path: 'Open.md', basename: 'Open' };
      mockApp.workspace.getActiveFile.mockReturnValue(activeFile);
      mockVault.getAbstractFileByPath.mockReturnValue(activeFile);
      mockVault.cachedRead.mockResolvedValue('# Open\nBody');

      const ctx = await builder.buildContext('hello', 5);
      expect(ctx.openNote).toBeDefined();
      expect(ctx.openNote?.title).toBe('Open');
    });

    it('should include selected text when available', async () => {
      const activeFile = { path: 'Open.md', basename: 'Open' };
      mockApp.workspace.getActiveFile.mockReturnValue(activeFile);
      mockVault.getAbstractFileByPath.mockReturnValue(activeFile);
      mockVault.cachedRead.mockResolvedValue('Body');

      const mockEditor = { getSelection: jest.fn().mockReturnValue('Selected passage') };
      const mockView = { editor: mockEditor };
      mockApp.workspace.getActiveViewOfType.mockReturnValue(mockView);

      const ctx = await builder.buildContext('hello', 5);
      expect(ctx.selectedText).toBe('Selected passage');
    });

    it('should call vaultIndexer.searchVault for default scope', async () => {
      await builder.buildContext('search term', 5);
      expect(mockVaultIndexer.searchVault).toHaveBeenCalledWith('search term', 5);
    });

    it('should skip vault search for explicit scope', async () => {
      mockVault.getAbstractFileByPath.mockReturnValue({ path: 'N.md', basename: 'N' });
      mockVault.getMarkdownFiles.mockReturnValue([{ path: 'N.md', basename: 'N' }]);
      mockVault.cachedRead.mockResolvedValue('');

      await builder.buildContext('use only this note [[N]]', 5);
      expect(mockVaultIndexer.searchVault).not.toHaveBeenCalled();
    });

    it('should gather backlinks and outlinks in related mode', async () => {
      const activeFile = { path: 'A.md', basename: 'A' };
      const backFile = { path: 'B.md', basename: 'B' };
      const outFile = { path: 'C.md', basename: 'C' };

      mockApp.workspace.getActiveFile.mockReturnValue(activeFile);
      mockApp.metadataCache.resolvedLinks = { 'B.md': { 'A.md': 1 } };
      mockApp.metadataCache.getCache.mockReturnValue({ links: [{ link: 'C' }] });

      mockVault.getAbstractFileByPath.mockImplementation((p: string) => {
        if (p === 'A.md') return activeFile;
        if (p === 'B.md') return backFile;
        if (p === 'C.md') return outFile;
        return null;
      });
      mockVault.getMarkdownFiles.mockReturnValue([backFile, outFile]);
      mockVault.cachedRead.mockResolvedValue('');

      const ctx = await builder.buildContext('include related notes', 5);
      expect(ctx.backlinks.length).toBe(1);
      expect(ctx.backlinks[0].path).toBe('B.md');
      expect(ctx.outlinks.length).toBe(1);
      expect(ctx.outlinks[0].path).toBe('C.md');
      expect(ctx.relatedNotes.length).toBe(2);
    });
  });

  describe('formatContext', () => {
    it('should include selected text, open note, mentions, and search results', () => {
      const ctx = {
        explicitMentions: [
          { path: 'M.md', title: 'Mention', content: 'Mention body', score: 1 },
        ],
        openNote: { path: 'O.md', title: 'Open', content: 'Open body', score: 1 },
        selectedText: 'Selected text',
        backlinks: [],
        outlinks: [],
        relatedNotes: [],
        searchResults: [
          { path: 'S.md', title: 'Search', content: 'Search body', score: 1 },
        ],
      };

      const formatted = builder.formatContext(ctx as any, 2000);
      expect(formatted).toContain('Selected text from current note:');
      expect(formatted).toContain('Selected text');
      expect(formatted).toContain('Current open note: Open (O.md)');
      expect(formatted).toContain('Explicitly mentioned notes:');
      expect(formatted).toContain('Mention (M.md)');
      expect(formatted).toContain('Vault search results:');
      expect(formatted).toContain('Search (S.md)');
    });

    it('should truncate long context', () => {
      const ctx = {
        explicitMentions: [],
        openNote: undefined,
        selectedText: undefined,
        backlinks: [],
        outlinks: [],
        relatedNotes: [],
        searchResults: [
          { path: 'S.md', title: 'Search', content: 'A'.repeat(500), score: 1 },
        ],
      };

      const formatted = builder.formatContext(ctx as any, 50);
      expect(formatted).toContain('... [truncated]');
    });
  });
});