import {
describe, it, expect, beforeEach, afterEach,
} from 'vitest';
import * as fs from 'node:fs/promises';
import * as os from 'node:os';
import * as path from 'node:path';
import {getRegisteredTool} from './_test-utils.js';
type ViewArgs = {path: string; view_range?: [number, number]};
describe('view tool', () => {
let handler: (args: ViewArgs) => Promise<unknown>;
let tmpDir: string;
beforeEach(async () => {
const tool = getRegisteredTool<ViewArgs>('view');
handler = tool.handler;
tmpDir = await fs.mkdtemp(path.join(os.tmpdir(), 'filesystem-mcp-test-'));
});
afterEach(async () => {
await fs.rm(tmpDir, {recursive: true, force: true});
});
it('reads file with line numbers', async () => {
const testFile = path.join(tmpDir, 'test.txt');
await fs.writeFile(testFile, 'line1\nline2\nline3\n');
const result = await handler({path: testFile}) as {structuredContent: {type: string; content: string; totalLines: number}};
expect(result.structuredContent.type).toBe('file');
expect(result.structuredContent.totalLines).toBe(4); // includes trailing empty line
expect(result.structuredContent.content).toContain('line1');
expect(result.structuredContent.content).toContain('line2');
});
it('reads file with view_range', async () => {
const testFile = path.join(tmpDir, 'test.txt');
await fs.writeFile(testFile, 'line1\nline2\nline3\nline4\nline5\n');
const result = await handler({path: testFile, view_range: [2, 4]}) as {structuredContent: {content: string; viewedRange: [number, number]}};
expect(result.structuredContent.viewedRange).toEqual([2, 4]);
expect(result.structuredContent.content).toContain('line2');
expect(result.structuredContent.content).toContain('line3');
expect(result.structuredContent.content).toContain('line4');
expect(result.structuredContent.content).not.toContain('line1');
expect(result.structuredContent.content).not.toContain('line5');
});
it('lists directory contents', async () => {
await fs.writeFile(path.join(tmpDir, 'file1.txt'), 'content');
await fs.mkdir(path.join(tmpDir, 'subdir'));
await fs.writeFile(path.join(tmpDir, 'subdir', 'file2.txt'), 'content');
const result = await handler({path: tmpDir}) as {structuredContent: {type: string; entries: string[]}};
expect(result.structuredContent.type).toBe('directory');
expect(result.structuredContent.entries).toContain('file1.txt');
expect(result.structuredContent.entries).toContain('subdir/');
});
});
