/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { vi, describe, it, expect, beforeEach, afterEach } from 'vitest';
import { mockControl } from '../__mocks__/fs/promises.js';
import { ReadManyFilesTool } from './read-many-files.js';
import { FileDiscoveryService } from '../services/fileDiscoveryService.js';
import path from 'node:path';
import fs from 'node:fs'; // Actual fs for setup
import os from 'node:os';
import { WorkspaceContext } from '../utils/workspaceContext.js';
import { StandardFileSystemService } from '../services/fileSystemService.js';
import { ToolErrorType } from './tool-error.js';
import { COMMON_IGNORE_PATTERNS, DEFAULT_FILE_EXCLUDES, } from '../utils/ignorePatterns.js';
import * as glob from 'glob';
vi.mock('glob', { spy: true });
vi.mock('mime', () => {
    const getType = (filename) => {
        if (filename.endsWith('.ts') || filename.endsWith('.js')) {
            return 'text/plain';
        }
        if (filename.endsWith('.png')) {
            return 'image/png';
        }
        if (filename.endsWith('.pdf')) {
            return 'application/pdf';
        }
        if (filename.endsWith('.mp3') || filename.endsWith('.wav')) {
            return 'audio/mpeg';
        }
        if (filename.endsWith('.mp4') || filename.endsWith('.mov')) {
            return 'video/mp4';
        }
        return false;
    };
    return {
        default: {
            getType,
        },
        getType,
    };
});
vi.mock('../telemetry/loggers.js', () => ({
    logFileOperation: vi.fn(),
}));
describe('ReadManyFilesTool', () => {
    let tool;
    let tempRootDir;
    let tempDirOutsideRoot;
    let mockReadFileFn;
    beforeEach(async () => {
        tempRootDir = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'read-many-files-root-')));
        tempDirOutsideRoot = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'read-many-files-external-')));
        fs.writeFileSync(path.join(tempRootDir, '.geminiignore'), 'foo.*');
        const fileService = new FileDiscoveryService(tempRootDir);
        const mockConfig = {
            getFileService: () => fileService,
            getFileSystemService: () => new StandardFileSystemService(),
            getFileFilteringOptions: () => ({
                respectGitIgnore: true,
                respectGeminiIgnore: true,
            }),
            getTargetDir: () => tempRootDir,
            getWorkspaceDirs: () => [tempRootDir],
            getWorkspaceContext: () => new WorkspaceContext(tempRootDir),
            getFileExclusions: () => ({
                getCoreIgnorePatterns: () => COMMON_IGNORE_PATTERNS,
                getDefaultExcludePatterns: () => DEFAULT_FILE_EXCLUDES,
                getGlobExcludes: () => COMMON_IGNORE_PATTERNS,
                buildExcludePatterns: () => DEFAULT_FILE_EXCLUDES,
                getReadManyFilesExcludes: () => DEFAULT_FILE_EXCLUDES,
            }),
            isInteractive: () => false,
        };
        tool = new ReadManyFilesTool(mockConfig);
        mockReadFileFn = mockControl.mockReadFile;
        mockReadFileFn.mockReset();
        mockReadFileFn.mockImplementation(async (filePath, options) => {
            const fp = typeof filePath === 'string'
                ? filePath
                : filePath.toString();
            if (fs.existsSync(fp)) {
                const originalFs = await vi.importActual('fs');
                return originalFs.promises.readFile(fp, options);
            }
            if (fp.endsWith('nonexistent-file.txt')) {
                const err = new Error(`ENOENT: no such file or directory, open '${fp}'`);
                err.code = 'ENOENT';
                throw err;
            }
            if (fp.endsWith('unreadable.txt')) {
                const err = new Error(`EACCES: permission denied, open '${fp}'`);
                err.code = 'EACCES';
                throw err;
            }
            if (fp.endsWith('.png'))
                return Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]); // PNG header
            if (fp.endsWith('.pdf'))
                return Buffer.from('%PDF-1.4...'); // PDF start
            if (fp.endsWith('binary.bin'))
                return Buffer.from([0x00, 0x01, 0x02, 0x00, 0x03]);
            const err = new Error(`ENOENT: no such file or directory, open '${fp}' (unmocked path)`);
            err.code = 'ENOENT';
            throw err;
        });
    });
    afterEach(() => {
        if (fs.existsSync(tempRootDir)) {
            fs.rmSync(tempRootDir, { recursive: true, force: true });
        }
        if (fs.existsSync(tempDirOutsideRoot)) {
            fs.rmSync(tempDirOutsideRoot, { recursive: true, force: true });
        }
    });
    describe('build', () => {
        it('should return an invocation for valid relative paths within root', () => {
            const params = { include: ['file1.txt', 'subdir/file2.txt'] };
            const invocation = tool.build(params);
            expect(invocation).toBeDefined();
        });
        it('should return an invocation for valid glob patterns within root', () => {
            const params = { include: ['*.txt', 'subdir/**/*.js'] };
            const invocation = tool.build(params);
            expect(invocation).toBeDefined();
        });
        it('should return an invocation for paths trying to escape the root (e.g., ../) as execute handles this', () => {
            const params = { include: ['../outside.txt'] };
            const invocation = tool.build(params);
            expect(invocation).toBeDefined();
        });
        it('should return an invocation for absolute paths as execute handles this', () => {
            const params = {
                include: [path.join(tempDirOutsideRoot, 'absolute.txt')],
            };
            const invocation = tool.build(params);
            expect(invocation).toBeDefined();
        });
        it('should throw error if paths array is empty', () => {
            const params = { include: [] };
            expect(() => tool.build(params)).toThrow('params/include must NOT have fewer than 1 items');
        });
        it('should return an invocation for valid exclude and include patterns', () => {
            const params = {
                exclude: ['**/*.test.ts'],
                include: ['src/**/*.ts', 'src/utils/*.ts'],
            };
            const invocation = tool.build(params);
            expect(invocation).toBeDefined();
        });
        it('should throw error if paths array contains an empty string', () => {
            const params = { include: ['file1.txt', ''] };
            expect(() => tool.build(params)).toThrow('params/include/1 must NOT have fewer than 1 characters');
        });
        it('should throw error if include array contains non-string elements', () => {
            const params = {
                include: ['*.ts', 123],
            };
            expect(() => tool.build(params)).toThrow('params/include/1 must be string');
        });
        it('should throw error if exclude array contains non-string elements', () => {
            const params = {
                include: ['file1.txt'],
                exclude: ['*.log', {}],
            };
            expect(() => tool.build(params)).toThrow('params/exclude/1 must be string');
        });
    });
    describe('execute', () => {
        const createFile = (filePath, content = '') => {
            const fullPath = path.join(tempRootDir, filePath);
            fs.mkdirSync(path.dirname(fullPath), { recursive: true });
            fs.writeFileSync(fullPath, content);
        };
        const createBinaryFile = (filePath, data) => {
            const fullPath = path.join(tempRootDir, filePath);
            fs.mkdirSync(path.dirname(fullPath), { recursive: true });
            fs.writeFileSync(fullPath, data);
        };
        it('should read a single specified file', async () => {
            createFile('file1.txt', 'Content of file1');
            const params = { include: ['file1.txt'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const expectedPath = path.join(tempRootDir, 'file1.txt');
            expect(result.llmContent).toEqual([
                `--- ${expectedPath} ---\n\nContent of file1\n\n`,
                `\n--- End of content ---`,
            ]);
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **1 file(s)**');
        });
        it('should read multiple specified files', async () => {
            createFile('file1.txt', 'Content1');
            createFile('subdir/file2.js', 'Content2');
            const params = { include: ['file1.txt', 'subdir/file2.js'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            const expectedPath1 = path.join(tempRootDir, 'file1.txt');
            const expectedPath2 = path.join(tempRootDir, 'subdir/file2.js');
            expect(content.some((c) => c.includes(`--- ${expectedPath1} ---\n\nContent1\n\n`))).toBe(true);
            expect(content.some((c) => c.includes(`--- ${expectedPath2} ---\n\nContent2\n\n`))).toBe(true);
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **2 file(s)**');
        });
        it('should handle glob patterns', async () => {
            createFile('file.txt', 'Text file');
            createFile('another.txt', 'Another text');
            createFile('sub/data.json', '{}');
            const params = { include: ['*.txt'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            const expectedPath1 = path.join(tempRootDir, 'file.txt');
            const expectedPath2 = path.join(tempRootDir, 'another.txt');
            expect(content.some((c) => c.includes(`--- ${expectedPath1} ---\n\nText file\n\n`))).toBe(true);
            expect(content.some((c) => c.includes(`--- ${expectedPath2} ---\n\nAnother text\n\n`))).toBe(true);
            expect(content.find((c) => c.includes('sub/data.json'))).toBeUndefined();
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **2 file(s)**');
        });
        it('should respect exclude patterns', async () => {
            createFile('src/main.ts', 'Main content');
            createFile('src/main.test.ts', 'Test content');
            const params = { include: ['src/**/*.ts'], exclude: ['**/*.test.ts'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            const expectedPath = path.join(tempRootDir, 'src/main.ts');
            expect(content).toEqual([
                `--- ${expectedPath} ---\n\nMain content\n\n`,
                `\n--- End of content ---`,
            ]);
            expect(content.find((c) => c.includes('src/main.test.ts'))).toBeUndefined();
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **1 file(s)**');
        });
        it('should handle nonexistent specific files gracefully', async () => {
            const params = { include: ['nonexistent-file.txt'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            expect(result.llmContent).toEqual([
                'No files matching the criteria were found or all were skipped.',
            ]);
            expect(result.returnDisplay).toContain('No files were read and concatenated based on the criteria.');
        });
        it('should use default excludes', async () => {
            createFile('node_modules/some-lib/index.js', 'lib code');
            createFile('src/app.js', 'app code');
            const params = { include: ['**/*.js'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            const expectedPath = path.join(tempRootDir, 'src/app.js');
            expect(content).toEqual([
                `--- ${expectedPath} ---\n\napp code\n\n`,
                `\n--- End of content ---`,
            ]);
            expect(content.find((c) => c.includes('node_modules/some-lib/index.js'))).toBeUndefined();
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **1 file(s)**');
        });
        it('should NOT use default excludes if useDefaultExcludes is false', async () => {
            createFile('node_modules/some-lib/index.js', 'lib code');
            createFile('src/app.js', 'app code');
            const params = { include: ['**/*.js'], useDefaultExcludes: false };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            const expectedPath1 = path.join(tempRootDir, 'node_modules/some-lib/index.js');
            const expectedPath2 = path.join(tempRootDir, 'src/app.js');
            expect(content.some((c) => c.includes(`--- ${expectedPath1} ---\n\nlib code\n\n`))).toBe(true);
            expect(content.some((c) => c.includes(`--- ${expectedPath2} ---\n\napp code\n\n`))).toBe(true);
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **2 file(s)**');
        });
        it('should include images as inlineData parts if explicitly requested by extension', async () => {
            createBinaryFile('image.png', Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]));
            const params = { include: ['*.png'] }; // Explicitly requesting .png
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            expect(result.llmContent).toEqual([
                {
                    inlineData: {
                        data: Buffer.from([
                            0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,
                        ]).toString('base64'),
                        mimeType: 'image/png',
                    },
                },
                '\n--- End of content ---',
            ]);
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **1 file(s)**');
        });
        it('should include images as inlineData parts if explicitly requested by name', async () => {
            createBinaryFile('myExactImage.png', Buffer.from([0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a]));
            const params = { include: ['myExactImage.png'] }; // Explicitly requesting by full name
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            expect(result.llmContent).toEqual([
                {
                    inlineData: {
                        data: Buffer.from([
                            0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a,
                        ]).toString('base64'),
                        mimeType: 'image/png',
                    },
                },
                '\n--- End of content ---',
            ]);
        });
        it('should skip PDF files if not explicitly requested by extension or name', async () => {
            createBinaryFile('document.pdf', Buffer.from('%PDF-1.4...'));
            createFile('notes.txt', 'text notes');
            const params = { include: ['*'] }; // Generic glob, not specific to .pdf
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            const expectedPath = path.join(tempRootDir, 'notes.txt');
            expect(content.some((c) => typeof c === 'string' &&
                c.includes(`--- ${expectedPath} ---\n\ntext notes\n\n`))).toBe(true);
            expect(result.returnDisplay).toContain('**Skipped 1 item(s):**');
            expect(result.returnDisplay).toContain('- `document.pdf` (Reason: asset file (image/pdf) was not explicitly requested by name or extension)');
        });
        it('should include PDF files as inlineData parts if explicitly requested by extension', async () => {
            createBinaryFile('important.pdf', Buffer.from('%PDF-1.4...'));
            const params = { include: ['*.pdf'] }; // Explicitly requesting .pdf files
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            expect(result.llmContent).toEqual([
                {
                    inlineData: {
                        data: Buffer.from('%PDF-1.4...').toString('base64'),
                        mimeType: 'application/pdf',
                    },
                },
                '\n--- End of content ---',
            ]);
        });
        it('should include PDF files as inlineData parts if explicitly requested by name', async () => {
            createBinaryFile('report-final.pdf', Buffer.from('%PDF-1.4...'));
            const params = { include: ['report-final.pdf'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            expect(result.llmContent).toEqual([
                {
                    inlineData: {
                        data: Buffer.from('%PDF-1.4...').toString('base64'),
                        mimeType: 'application/pdf',
                    },
                },
                '\n--- End of content ---',
            ]);
        });
        it('should return error if path is ignored by a .geminiignore pattern', async () => {
            createFile('foo.bar', '');
            createFile('bar.ts', '');
            createFile('foo.quux', '');
            const params = { include: ['foo.bar', 'bar.ts', 'foo.quux'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            expect(result.returnDisplay).not.toContain('foo.bar');
            expect(result.returnDisplay).not.toContain('foo.quux');
            expect(result.returnDisplay).toContain('bar.ts');
        });
        it('should read files from multiple workspace directories', async () => {
            const tempDir1 = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'multi-dir-1-')));
            const tempDir2 = fs.realpathSync(fs.mkdtempSync(path.join(os.tmpdir(), 'multi-dir-2-')));
            const fileService = new FileDiscoveryService(tempDir1);
            const mockConfig = {
                getFileService: () => fileService,
                getFileSystemService: () => new StandardFileSystemService(),
                getFileFilteringOptions: () => ({
                    respectGitIgnore: true,
                    respectGeminiIgnore: true,
                }),
                getWorkspaceContext: () => new WorkspaceContext(tempDir1, [tempDir2]),
                getTargetDir: () => tempDir1,
                getFileExclusions: () => ({
                    getCoreIgnorePatterns: () => COMMON_IGNORE_PATTERNS,
                    getDefaultExcludePatterns: () => [],
                    getGlobExcludes: () => COMMON_IGNORE_PATTERNS,
                    buildExcludePatterns: () => [],
                    getReadManyFilesExcludes: () => [],
                }),
                isInteractive: () => false,
            };
            tool = new ReadManyFilesTool(mockConfig);
            fs.writeFileSync(path.join(tempDir1, 'file1.txt'), 'Content1');
            fs.writeFileSync(path.join(tempDir2, 'file2.txt'), 'Content2');
            const params = { include: ['*.txt'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            if (!Array.isArray(content)) {
                throw new Error(`llmContent is not an array: ${content}`);
            }
            const expectedPath1 = path.join(tempDir1, 'file1.txt');
            const expectedPath2 = path.join(tempDir2, 'file2.txt');
            expect(content.some((c) => c.includes(`--- ${expectedPath1} ---\n\nContent1\n\n`))).toBe(true);
            expect(content.some((c) => c.includes(`--- ${expectedPath2} ---\n\nContent2\n\n`))).toBe(true);
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **2 file(s)**');
            fs.rmSync(tempDir1, { recursive: true, force: true });
            fs.rmSync(tempDir2, { recursive: true, force: true });
        });
        it('should add a warning for truncated files', async () => {
            createFile('file1.txt', 'Content1');
            // Create a file that will be "truncated" by making it long
            const longContent = Array.from({ length: 2500 }, (_, i) => `L${i}`).join('\n');
            createFile('large-file.txt', longContent);
            const params = { include: ['*.txt'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            const normalFileContent = content.find((c) => c.includes('file1.txt'));
            const truncatedFileContent = content.find((c) => c.includes('large-file.txt'));
            expect(normalFileContent).not.toContain('[WARNING: This file was truncated.');
            expect(truncatedFileContent).toContain("[WARNING: This file was truncated. To view the full content, use the 'read_file' tool on this specific file.]");
            // Check that the actual content is still there but truncated
            expect(truncatedFileContent).toContain('L200');
            expect(truncatedFileContent).not.toContain('L2400');
        });
        it('should read files with special characters like [] and () in the path', async () => {
            const filePath = 'src/app/[test]/(dashboard)/testing/components/code.tsx';
            createFile(filePath, 'Content of receive-detail');
            const params = { include: [filePath] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const expectedPath = path.join(tempRootDir, filePath);
            expect(result.llmContent).toEqual([
                `--- ${expectedPath} ---

Content of receive-detail

`,
                `\n--- End of content ---`,
            ]);
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **1 file(s)**');
        });
        it('should read files with special characters in the name', async () => {
            createFile('file[1].txt', 'Content of file[1]');
            const params = { include: ['file[1].txt'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const expectedPath = path.join(tempRootDir, 'file[1].txt');
            expect(result.llmContent).toEqual([
                `--- ${expectedPath} ---

Content of file[1]

`,
                `\n--- End of content ---`,
            ]);
            expect(result.returnDisplay).toContain('Successfully read and concatenated content from **1 file(s)**');
        });
    });
    describe('Error handling', () => {
        it('should return an INVALID_TOOL_PARAMS error if no paths are provided', async () => {
            const params = { include: [] };
            expect(() => {
                tool.build(params);
            }).toThrow('params/include must NOT have fewer than 1 items');
        });
        it('should return a READ_MANY_FILES_SEARCH_ERROR on glob failure', async () => {
            vi.mocked(glob.glob).mockRejectedValue(new Error('Glob failed'));
            const params = { include: ['*.txt'] };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            expect(result.error?.type).toBe(ToolErrorType.READ_MANY_FILES_SEARCH_ERROR);
            expect(result.llmContent).toBe('Error during file search: Glob failed');
            // Reset glob.
            vi.mocked(glob.glob).mockReset();
        });
    });
    describe('Batch Processing', () => {
        const createMultipleFiles = (count, contentPrefix = 'Content') => {
            const files = [];
            for (let i = 0; i < count; i++) {
                const fileName = `file${i}.txt`;
                createFile(fileName, `${contentPrefix} ${i}`);
                files.push(fileName);
            }
            return files;
        };
        const createFile = (filePath, content = '') => {
            const fullPath = path.join(tempRootDir, filePath);
            fs.mkdirSync(path.dirname(fullPath), { recursive: true });
            fs.writeFileSync(fullPath, content);
        };
        it('should process files in parallel', async () => {
            // Mock detectFileType to add artificial delay to simulate I/O
            const detectFileTypeSpy = vi.spyOn(await import('../utils/fileUtils.js'), 'detectFileType');
            // Create files
            const fileCount = 4;
            const files = createMultipleFiles(fileCount, 'Batch test');
            // Mock with 10ms delay per file to simulate I/O operations
            detectFileTypeSpy.mockImplementation(async (_filePath) => {
                await new Promise((resolve) => setTimeout(resolve, 10));
                return 'text';
            });
            const params = { include: files };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            // Verify all files were processed. The content should have fileCount
            // entries + 1 for the output terminator.
            const content = result.llmContent;
            expect(content).toHaveLength(fileCount + 1);
            for (let i = 0; i < fileCount; i++) {
                expect(content.join('')).toContain(`Batch test ${i}`);
            }
            // Cleanup mock
            detectFileTypeSpy.mockRestore();
        });
        it('should handle batch processing errors gracefully', async () => {
            // Create mix of valid and problematic files
            createFile('valid1.txt', 'Valid content 1');
            createFile('valid2.txt', 'Valid content 2');
            createFile('valid3.txt', 'Valid content 3');
            const params = {
                include: [
                    'valid1.txt',
                    'valid2.txt',
                    'nonexistent-file.txt', // This will fail
                    'valid3.txt',
                ],
            };
            const invocation = tool.build(params);
            const result = await invocation.execute(new AbortController().signal);
            const content = result.llmContent;
            // Should successfully process valid files despite one failure
            expect(content.length).toBeGreaterThanOrEqual(3);
            expect(result.returnDisplay).toContain('Successfully read');
            // Verify valid files were processed
            const expectedPath1 = path.join(tempRootDir, 'valid1.txt');
            const expectedPath3 = path.join(tempRootDir, 'valid3.txt');
            expect(content.some((c) => c.includes(expectedPath1))).toBe(true);
            expect(content.some((c) => c.includes(expectedPath3))).toBe(true);
        });
        it('should execute file operations concurrently', async () => {
            // Track execution order to verify concurrency
            const executionOrder = [];
            const detectFileTypeSpy = vi.spyOn(await import('../utils/fileUtils.js'), 'detectFileType');
            const files = ['file1.txt', 'file2.txt', 'file3.txt'];
            files.forEach((file) => createFile(file, 'test content'));
            // Mock to track concurrent vs sequential execution
            detectFileTypeSpy.mockImplementation(async (filePath) => {
                const fileName = filePath.split('/').pop() || '';
                executionOrder.push(`start:${fileName}`);
                // Add delay to make timing differences visible
                await new Promise((resolve) => setTimeout(resolve, 50));
                executionOrder.push(`end:${fileName}`);
                return 'text';
            });
            const invocation = tool.build({ include: files });
            await invocation.execute(new AbortController().signal);
            // Verify concurrent execution pattern
            // In parallel execution: all "start:" events should come before all "end:" events
            // In sequential execution: "start:file1", "end:file1", "start:file2", "end:file2", etc.
            const startEvents = executionOrder.filter((e) => e.startsWith('start:')).length;
            const firstEndIndex = executionOrder.findIndex((e) => e.startsWith('end:'));
            const startsBeforeFirstEnd = executionOrder
                .slice(0, firstEndIndex)
                .filter((e) => e.startsWith('start:')).length;
            // For parallel processing, ALL start events should happen before the first end event
            expect(startsBeforeFirstEnd).toBe(startEvents); // Should PASS with parallel implementation
            detectFileTypeSpy.mockRestore();
        });
    });
});
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