/**
 * Tests for piece selection helpers
 */

import { describe, it, expect, vi, beforeEach } from 'vitest';
import type { PieceDirEntry } from '../infra/config/loaders/pieceLoader.js';
import type { CategorizedPieces } from '../infra/config/loaders/pieceCategories.js';
import type { PieceWithSource } from '../infra/config/loaders/pieceResolver.js';

const selectOptionMock = vi.fn();
const bookmarkState = vi.hoisted(() => ({
  bookmarks: [] as string[],
}));

vi.mock('../shared/prompt/index.js', () => ({
  selectOption: selectOptionMock,
}));

vi.mock('../shared/ui/index.js', () => ({
  info: vi.fn(),
  warn: vi.fn(),
}));

vi.mock('../infra/config/global/index.js', () => ({
  getBookmarkedPieces: () => bookmarkState.bookmarks,
  addBookmark: vi.fn(),
  removeBookmark: vi.fn(),
  toggleBookmark: vi.fn(),
}));

vi.mock('../infra/config/index.js', async (importOriginal) => {
  const actual = await importOriginal() as Record<string, unknown>;
  return actual;
});

const configMock = vi.hoisted(() => ({
  listPieces: vi.fn(),
  listPieceEntries: vi.fn(),
  loadAllPiecesWithSources: vi.fn(),
  getPieceCategories: vi.fn(),
  buildCategorizedPieces: vi.fn(),
  getCurrentPiece: vi.fn(),
  findPieceCategories: vi.fn(() => []),
}));

vi.mock('../infra/config/index.js', () => configMock);

const { selectPieceFromEntries, selectPieceFromCategorizedPieces, selectPiece } = await import('../features/pieceSelection/index.js');

describe('selectPieceFromEntries', () => {
  beforeEach(() => {
    selectOptionMock.mockReset();
    bookmarkState.bookmarks = [];
  });

  it('should select from custom pieces when source is chosen', async () => {
    const entries: PieceDirEntry[] = [
      { name: 'custom-flow', path: '/tmp/custom.yaml', source: 'user' },
      { name: 'builtin-flow', path: '/tmp/builtin.yaml', source: 'builtin' },
    ];

    selectOptionMock
      .mockResolvedValueOnce('custom')
      .mockResolvedValueOnce('custom-flow');

    const selected = await selectPieceFromEntries(entries, '');
    expect(selected).toBe('custom-flow');
    expect(selectOptionMock).toHaveBeenCalledTimes(2);
  });

  it('should skip source selection when only builtin pieces exist', async () => {
    const entries: PieceDirEntry[] = [
      { name: 'builtin-flow', path: '/tmp/builtin.yaml', source: 'builtin' },
    ];

    selectOptionMock.mockResolvedValueOnce('builtin-flow');

    const selected = await selectPieceFromEntries(entries, '');
    expect(selected).toBe('builtin-flow');
    expect(selectOptionMock).toHaveBeenCalledTimes(1);
  });
});

function createPieceMap(entries: { name: string; source: 'user' | 'builtin' }[]): Map<string, PieceWithSource> {
  const map = new Map<string, PieceWithSource>();
  for (const e of entries) {
    map.set(e.name, {
      source: e.source,
      config: {
        name: e.name,
        movements: [],
        initialMovement: 'start',
        maxMovements: 1,
      },
    });
  }
  return map;
}

describe('selectPieceFromCategorizedPieces', () => {
  beforeEach(() => {
    selectOptionMock.mockReset();
    bookmarkState.bookmarks = [];
  });

  it('should show categories at top level', async () => {
    const categorized: CategorizedPieces = {
      categories: [
        { name: 'My Pieces', pieces: ['my-piece'], children: [] },
        { name: 'Quick Start', pieces: ['default'], children: [] },
      ],
      allPieces: createPieceMap([
        { name: 'my-piece', source: 'user' },
        { name: 'default', source: 'builtin' },
      ]),
      missingPieces: [],
    };

    selectOptionMock.mockResolvedValueOnce('__current__');

    await selectPieceFromCategorizedPieces(categorized, 'my-piece');

    const firstCallOptions = selectOptionMock.mock.calls[0]![1] as { label: string; value: string }[];
    const labels = firstCallOptions.map((o) => o.label);

    expect(labels[0]).toBe('🎼 my-piece (current)');
    expect(labels.some((l) => l.includes('My Pieces'))).toBe(true);
    expect(labels.some((l) => l.includes('Quick Start'))).toBe(true);
  });

  it('should show current piece and bookmarks above categories', async () => {
    bookmarkState.bookmarks = ['research'];

    const categorized: CategorizedPieces = {
      categories: [
        { name: 'Quick Start', pieces: ['default'], children: [] },
      ],
      allPieces: createPieceMap([
        { name: 'default', source: 'builtin' },
        { name: 'research', source: 'builtin' },
      ]),
      missingPieces: [],
    };

    selectOptionMock.mockResolvedValueOnce('__current__');

    const selected = await selectPieceFromCategorizedPieces(categorized, 'default');
    expect(selected).toBe('default');

    const firstCallOptions = selectOptionMock.mock.calls[0]![1] as { label: string; value: string }[];
    const labels = firstCallOptions.map((o) => o.label);

    // Current piece first, bookmarks second, categories after
    expect(labels[0]).toBe('🎼 default (current)');
    expect(labels[1]).toBe('🎼 research [*]');
  });

  it('should navigate into a category and select a piece', async () => {
    const categorized: CategorizedPieces = {
      categories: [
        { name: 'Dev', pieces: ['my-piece'], children: [] },
      ],
      allPieces: createPieceMap([
        { name: 'my-piece', source: 'user' },
      ]),
      missingPieces: [],
    };

    // Select category, then select piece inside it
    selectOptionMock
      .mockResolvedValueOnce('__custom_category__:Dev')
      .mockResolvedValueOnce('my-piece');

    const selected = await selectPieceFromCategorizedPieces(categorized, '');
    expect(selected).toBe('my-piece');
  });

  it('should navigate into subcategories recursively', async () => {
    const categorized: CategorizedPieces = {
      categories: [
        {
          name: 'Hybrid',
          pieces: [],
          children: [
            { name: 'Quick Start', pieces: ['hybrid-default'], children: [] },
            { name: 'Full Stack', pieces: ['hybrid-expert'], children: [] },
          ],
        },
      ],
      allPieces: createPieceMap([
        { name: 'hybrid-default', source: 'builtin' },
        { name: 'hybrid-expert', source: 'builtin' },
      ]),
      missingPieces: [],
    };

    // Select Hybrid category → Quick Start subcategory → piece
    selectOptionMock
      .mockResolvedValueOnce('__custom_category__:Hybrid')
      .mockResolvedValueOnce('__category__:Quick Start')
      .mockResolvedValueOnce('hybrid-default');

    const selected = await selectPieceFromCategorizedPieces(categorized, '');
    expect(selected).toBe('hybrid-default');
    expect(selectOptionMock).toHaveBeenCalledTimes(3);
  });

  it('should show subcategories and pieces at the same level within a category', async () => {
    const categorized: CategorizedPieces = {
      categories: [
        {
          name: 'Dev',
          pieces: ['base-piece'],
          children: [
            { name: 'Advanced', pieces: ['adv-piece'], children: [] },
          ],
        },
      ],
      allPieces: createPieceMap([
        { name: 'base-piece', source: 'user' },
        { name: 'adv-piece', source: 'user' },
      ]),
      missingPieces: [],
    };

    // Select Dev category, then directly select the root-level piece
    selectOptionMock
      .mockResolvedValueOnce('__custom_category__:Dev')
      .mockResolvedValueOnce('base-piece');

    const selected = await selectPieceFromCategorizedPieces(categorized, '');
    expect(selected).toBe('base-piece');

    // Second call should show Advanced subcategory AND base-piece at same level
    const secondCallOptions = selectOptionMock.mock.calls[1]![1] as { label: string; value: string }[];
    const labels = secondCallOptions.map((o) => o.label);

    // Should contain the subcategory folder
    expect(labels.some((l) => l.includes('Advanced'))).toBe(true);
    // Should contain the piece
    expect(labels.some((l) => l.includes('base-piece'))).toBe(true);
    // Should NOT contain the parent category again
    expect(labels.some((l) => l.includes('Dev'))).toBe(false);
  });
});

describe('selectPiece', () => {
  const entries: PieceDirEntry[] = [
    { name: 'custom-flow', path: '/tmp/custom.yaml', source: 'user' },
    { name: 'builtin-flow', path: '/tmp/builtin.yaml', source: 'builtin' },
  ];

  beforeEach(() => {
    selectOptionMock.mockReset();
    bookmarkState.bookmarks = [];
    configMock.listPieces.mockReset();
    configMock.listPieceEntries.mockReset();
    configMock.loadAllPiecesWithSources.mockReset();
    configMock.getPieceCategories.mockReset();
    configMock.buildCategorizedPieces.mockReset();
    configMock.getCurrentPiece.mockReset();
  });

  it('should return default piece when no pieces found and fallbackToDefault is true', async () => {
    configMock.getPieceCategories.mockReturnValue(null);
    configMock.listPieces.mockReturnValue([]);
    configMock.getCurrentPiece.mockReturnValue('default');

    const result = await selectPiece('/cwd');

    expect(result).toBe('default');
  });

  it('should return null when no pieces found and fallbackToDefault is false', async () => {
    configMock.getPieceCategories.mockReturnValue(null);
    configMock.listPieces.mockReturnValue([]);
    configMock.getCurrentPiece.mockReturnValue('default');

    const result = await selectPiece('/cwd', { fallbackToDefault: false });

    expect(result).toBeNull();
  });

  it('should prompt selection even when only one piece exists', async () => {
    configMock.getPieceCategories.mockReturnValue(null);
    configMock.listPieces.mockReturnValue(['only-piece']);
    configMock.listPieceEntries.mockReturnValue([
      { name: 'only-piece', path: '/tmp/only-piece.yaml', source: 'user' },
    ]);
    configMock.getCurrentPiece.mockReturnValue('only-piece');
    selectOptionMock.mockResolvedValueOnce('only-piece');

    const result = await selectPiece('/cwd');

    expect(result).toBe('only-piece');
    expect(selectOptionMock).toHaveBeenCalled();
  });

  it('should use category-based selection when category config exists', async () => {
    const pieceMap = createPieceMap([{ name: 'my-piece', source: 'user' }]);
    const categorized: CategorizedPieces = {
      categories: [{ name: 'Dev', pieces: ['my-piece'], children: [] }],
      allPieces: pieceMap,
      missingPieces: [],
    };

    configMock.getPieceCategories.mockReturnValue({ categories: ['Dev'] });
    configMock.loadAllPiecesWithSources.mockReturnValue(pieceMap);
    configMock.buildCategorizedPieces.mockReturnValue(categorized);
    configMock.getCurrentPiece.mockReturnValue('my-piece');

    selectOptionMock.mockResolvedValueOnce('__current__');

    const result = await selectPiece('/cwd');

    expect(result).toBe('my-piece');
    expect(configMock.buildCategorizedPieces).toHaveBeenCalled();
  });

  it('should use directory-based selection when no category config', async () => {
    configMock.getPieceCategories.mockReturnValue(null);
    configMock.listPieces.mockReturnValue(['piece-a', 'piece-b']);
    configMock.listPieceEntries.mockReturnValue(entries);
    configMock.getCurrentPiece.mockReturnValue('piece-a');

    selectOptionMock
      .mockResolvedValueOnce('custom')
      .mockResolvedValueOnce('custom-flow');

    const result = await selectPiece('/cwd');

    expect(result).toBe('custom-flow');
    expect(configMock.listPieceEntries).toHaveBeenCalled();
  });
});