/**
 * @license
 * Copyright 2025 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import * as fsPromises from 'fs/promises';
import * as path from 'path';
import * as os from 'os';
import { bfsFileSearch } from './bfsFileSearch.js';
import { FileDiscoveryService } from '../services/fileDiscoveryService.js';
describe('bfsFileSearch', () => {
    let testRootDir;
    async function createEmptyDir(...pathSegments) {
        const fullPath = path.join(testRootDir, ...pathSegments);
        await fsPromises.mkdir(fullPath, { recursive: true });
        return fullPath;
    }
    async function createTestFile(content, ...pathSegments) {
        const fullPath = path.join(testRootDir, ...pathSegments);
        await fsPromises.mkdir(path.dirname(fullPath), { recursive: true });
        await fsPromises.writeFile(fullPath, content);
        return fullPath;
    }
    beforeEach(async () => {
        testRootDir = await fsPromises.mkdtemp(path.join(os.tmpdir(), 'bfs-file-search-test-'));
    });
    afterEach(async () => {
        await fsPromises.rm(testRootDir, { recursive: true, force: true });
    });
    it('should find a file in the root directory', async () => {
        const targetFilePath = await createTestFile('content', 'target.txt');
        const result = await bfsFileSearch(testRootDir, { fileName: 'target.txt' });
        expect(result).toEqual([targetFilePath]);
    });
    it('should find a file in a nested directory', async () => {
        const targetFilePath = await createTestFile('content', 'a', 'b', 'target.txt');
        const result = await bfsFileSearch(testRootDir, { fileName: 'target.txt' });
        expect(result).toEqual([targetFilePath]);
    });
    it('should find multiple files with the same name', async () => {
        const targetFilePath1 = await createTestFile('content1', 'a', 'target.txt');
        const targetFilePath2 = await createTestFile('content2', 'b', 'target.txt');
        const result = await bfsFileSearch(testRootDir, { fileName: 'target.txt' });
        result.sort();
        expect(result).toEqual([targetFilePath1, targetFilePath2].sort());
    });
    it('should return an empty array if no file is found', async () => {
        await createTestFile('content', 'other.txt');
        const result = await bfsFileSearch(testRootDir, { fileName: 'target.txt' });
        expect(result).toEqual([]);
    });
    it('should ignore directories specified in ignoreDirs', async () => {
        await createTestFile('content', 'ignored', 'target.txt');
        const targetFilePath = await createTestFile('content', 'not-ignored', 'target.txt');
        const result = await bfsFileSearch(testRootDir, {
            fileName: 'target.txt',
            ignoreDirs: ['ignored'],
        });
        expect(result).toEqual([targetFilePath]);
    });
    it('should respect the maxDirs limit and not find the file', async () => {
        await createTestFile('content', 'a', 'b', 'c', 'target.txt');
        const result = await bfsFileSearch(testRootDir, {
            fileName: 'target.txt',
            maxDirs: 3,
        });
        expect(result).toEqual([]);
    });
    it('should respect the maxDirs limit and find the file', async () => {
        const targetFilePath = await createTestFile('content', 'a', 'b', 'c', 'target.txt');
        const result = await bfsFileSearch(testRootDir, {
            fileName: 'target.txt',
            maxDirs: 4,
        });
        expect(result).toEqual([targetFilePath]);
    });
    describe('with FileDiscoveryService', () => {
        let projectRoot;
        beforeEach(async () => {
            projectRoot = await createEmptyDir('project');
        });
        it('should ignore gitignored files', async () => {
            await createEmptyDir('project', '.git');
            await createTestFile('node_modules/', 'project', '.gitignore');
            await createTestFile('content', 'project', 'node_modules', 'target.txt');
            const targetFilePath = await createTestFile('content', 'project', 'not-ignored', 'target.txt');
            const fileService = new FileDiscoveryService(projectRoot);
            const result = await bfsFileSearch(projectRoot, {
                fileName: 'target.txt',
                fileService,
                fileFilteringOptions: {
                    respectGitIgnore: true,
                    respectGeminiIgnore: true,
                },
            });
            expect(result).toEqual([targetFilePath]);
        });
        it('should ignore geminiignored files', async () => {
            await createTestFile('node_modules/', 'project', '.geminiignore');
            await createTestFile('content', 'project', 'node_modules', 'target.txt');
            const targetFilePath = await createTestFile('content', 'project', 'not-ignored', 'target.txt');
            const fileService = new FileDiscoveryService(projectRoot);
            const result = await bfsFileSearch(projectRoot, {
                fileName: 'target.txt',
                fileService,
                fileFilteringOptions: {
                    respectGitIgnore: false,
                    respectGeminiIgnore: true,
                },
            });
            expect(result).toEqual([targetFilePath]);
        });
        it('should not ignore files if respect flags are false', async () => {
            await createEmptyDir('project', '.git');
            await createTestFile('node_modules/', 'project', '.gitignore');
            const target1 = await createTestFile('content', 'project', 'node_modules', 'target.txt');
            const target2 = await createTestFile('content', 'project', 'not-ignored', 'target.txt');
            const fileService = new FileDiscoveryService(projectRoot);
            const result = await bfsFileSearch(projectRoot, {
                fileName: 'target.txt',
                fileService,
                fileFilteringOptions: {
                    respectGitIgnore: false,
                    respectGeminiIgnore: false,
                },
            });
            expect(result.sort()).toEqual([target1, target2].sort());
        });
    });
    it('should perform parallel directory scanning efficiently (performance test)', async () => {
        // Create a more complex directory structure for performance testing
        console.log('\n🚀 Testing Parallel BFS Performance...');
        // Create 50 directories with multiple levels for faster test execution
        for (let i = 0; i < 50; i++) {
            await createEmptyDir(`dir${i}`);
            await createEmptyDir(`dir${i}`, 'subdir1');
            await createEmptyDir(`dir${i}`, 'subdir2');
            await createEmptyDir(`dir${i}`, 'subdir1', 'deep');
            if (i < 10) {
                // Add target files in some directories
                await createTestFile('content', `dir${i}`, 'QWEN.md');
                await createTestFile('content', `dir${i}`, 'subdir1', 'QWEN.md');
            }
        }
        // Run multiple iterations to ensure consistency
        const iterations = 3;
        const durations = [];
        let foundFiles = 0;
        let firstResultSorted;
        for (let i = 0; i < iterations; i++) {
            const searchStartTime = performance.now();
            const result = await bfsFileSearch(testRootDir, {
                fileName: 'QWEN.md',
                maxDirs: 200,
                debug: false,
            });
            const duration = performance.now() - searchStartTime;
            durations.push(duration);
            // Verify consistency: all iterations should find the exact same files
            if (firstResultSorted === undefined) {
                foundFiles = result.length;
                firstResultSorted = result.sort();
            }
            else {
                expect(result.sort()).toEqual(firstResultSorted);
            }
            console.log(`📊 Iteration ${i + 1}: ${duration.toFixed(2)}ms`);
        }
        const avgDuration = durations.reduce((a, b) => a + b, 0) / durations.length;
        const maxDuration = Math.max(...durations);
        const minDuration = Math.min(...durations);
        console.log(`📊 Average Duration: ${avgDuration.toFixed(2)}ms`);
        console.log(`📊 Min/Max Duration: ${minDuration.toFixed(2)}ms / ${maxDuration.toFixed(2)}ms`);
        console.log(`📁 Found ${foundFiles} QWEN.md files`);
        console.log(`🏎️  Processing ~${Math.round(200 / (avgDuration / 1000))} dirs/second`);
        // Verify we found the expected files
        expect(foundFiles).toBe(20); // 10 dirs * 2 files each
        // Performance expectation: check consistency rather than absolute time
        const variance = maxDuration - minDuration;
        const consistencyRatio = variance / avgDuration;
        // Ensure reasonable performance (generous limit for CI environments)
        expect(avgDuration).toBeLessThan(2000); // Very generous limit
        // Ensure consistency across runs (variance should not be too high)
        // More tolerant in CI environments where performance can be variable
        const maxConsistencyRatio = process.env.CI ? 3.0 : 1.5;
        expect(consistencyRatio).toBeLessThan(maxConsistencyRatio); // Max variance should be reasonable
        console.log(`✅ Performance test passed: avg=${avgDuration.toFixed(2)}ms, consistency=${(consistencyRatio * 100).toFixed(1)}% (threshold: ${(maxConsistencyRatio * 100).toFixed(0)}%)`);
    });
});
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