// ─── Shell Tool ─────────────────────────────────────────────────────────────
import { z } from 'zod';
import { exec } from 'child_process';
import { promisify } from 'util';
import type { ToolDef } from '../../core/tools/index.js';

const execAsync = promisify(exec);

export const shellExecTool: ToolDef<
  { command: string; timeout?: number },
  { stdout: string; stderr: string; exitCode: number }
> = {
  id: 'shell.exec',
  name: 'shell_exec',
  description: 'Execute a shell command and return stdout, stderr, and exit code. Use for running builds, tests, git commands, or any CLI tool.',
  inputSchema: z.object({
    command: z.string().describe('Shell command to execute'),
    timeout: z.number().optional().describe('Timeout in milliseconds (default: 30000)'),
  }),
  outputSchema: z.object({
    stdout: z.string(),
    stderr: z.string(),
    exitCode: z.number(),
  }),
  permission: 'exec',
  sideEffect: 'process',
  timeout: 60000,
  retries: 0,
  tags: ['shell', 'exec'],
  renderer: { icon: '⚡', color: 'green' },
  async execute(input, ctx) {
    ctx.emit(`Executing: ${input.command}`);
    const timeout = input.timeout ?? 30000;
    try {
      const { stdout, stderr } = await execAsync(input.command, {
        cwd: ctx.workDir,
        timeout,
        maxBuffer: 1024 * 1024 * 10, // 10MB
        signal: ctx.signal,
      });
      return { stdout: stdout.slice(0, 50000), stderr: stderr.slice(0, 10000), exitCode: 0 };
    } catch (err: any) {
      return {
        stdout: (err.stdout ?? '').slice(0, 50000),
        stderr: (err.stderr ?? err.message ?? '').slice(0, 10000),
        exitCode: err.code ?? 1,
      };
    }
  },
};