import { describe, it, expect } from 'vitest';
import { ToolExecutor } from './executor.js';
import { ToolRegistry } from './registry.js';
import { HookEngine } from '../hooks/engine.js';
import type { Tool } from './types.js';

const echoTool: Tool = {
  name: 'test.echo',
  description: 'Echoes input',
  inputSchema: { type: 'object', properties: { text: { type: 'string' } }, required: ['text'] },
  execute: async (args) => ({ success: true, output: (args as { text: string }).text }),
};

const slowTool: Tool = {
  name: 'test.slow',
  description: 'Takes forever',
  inputSchema: { type: 'object', properties: {} },
  execute: async () => {
    await new Promise(r => setTimeout(r, 5000));
    return { success: true, output: 'done' };
  },
};

const failTool: Tool = {
  name: 'test.fail',
  description: 'Throws',
  inputSchema: { type: 'object', properties: {} },
  execute: async () => { throw new Error('kaboom'); },
};

const bigOutputTool: Tool = {
  name: 'test.big',
  description: 'Returns huge output',
  inputSchema: { type: 'object', properties: {} },
  execute: async () => ({ success: true, output: 'x'.repeat(100_000) }),
};

describe('ToolExecutor', () => {
  it('executes a tool and returns result', async () => {
    const registry = new ToolRegistry();
    registry.register(echoTool);
    const hooks = new HookEngine({ confirm: [], log: [], silent: [] });
    const executor = new ToolExecutor(registry, hooks);

    const result = await executor.execute('test.echo', { text: 'hello' });
    expect(result.success).toBe(true);
    expect(result.output).toBe('hello');
  });

  it('returns error for unknown tool', async () => {
    const registry = new ToolRegistry();
    const hooks = new HookEngine({ confirm: [], log: [], silent: [] });
    const executor = new ToolExecutor(registry, hooks);

    const result = await executor.execute('nonexistent', {});
    expect(result.success).toBe(false);
    expect(result.error).toContain('not found');
  });

  it('catches tool execution errors', async () => {
    const registry = new ToolRegistry();
    registry.register(failTool);
    const hooks = new HookEngine({ confirm: [], log: [], silent: [] });
    const executor = new ToolExecutor(registry, hooks);

    const result = await executor.execute('test.fail', {});
    expect(result.success).toBe(false);
    expect(result.error).toContain('kaboom');
  });

  it('enforces timeout', async () => {
    const registry = new ToolRegistry();
    registry.register(slowTool);
    const hooks = new HookEngine({ confirm: [], log: [], silent: [] });
    const executor = new ToolExecutor(registry, hooks, { defaultTimeoutMs: 100 });

    const result = await executor.execute('test.slow', {});
    expect(result.success).toBe(false);
    expect(result.error).toContain('timed out');
  });

  it('truncates large output', async () => {
    const registry = new ToolRegistry();
    registry.register(bigOutputTool);
    const hooks = new HookEngine({ confirm: [], log: [], silent: [] });
    const executor = new ToolExecutor(registry, hooks, { maxOutputBytes: 1000 });

    const result = await executor.execute('test.big', {});
    expect(result.success).toBe(true);
    expect(result.output.length).toBeLessThanOrEqual(1100);
    expect(result.output).toContain('[truncated]');
  });

  it('blocks on confirm hook and resolves when approved', async () => {
    const registry = new ToolRegistry();
    registry.register(echoTool);
    const hooks = new HookEngine({ confirm: ['test.*'], log: [], silent: [] });
    const executor = new ToolExecutor(registry, hooks);

    const resultPromise = executor.execute('test.echo', { text: 'hi' });

    const pending = hooks.getPendingConfirmations();
    expect(pending).toHaveLength(1);
    hooks.resolveConfirmation(pending[0].id, { approved: true });

    const result = await resultPromise;
    expect(result.success).toBe(true);
    expect(result.output).toBe('hi');
  });

  it('blocks on confirm hook and returns denied', async () => {
    const registry = new ToolRegistry();
    registry.register(echoTool);
    const hooks = new HookEngine({ confirm: ['test.*'], log: [], silent: [] });
    const executor = new ToolExecutor(registry, hooks);

    const resultPromise = executor.execute('test.echo', { text: 'hi' });

    const pending = hooks.getPendingConfirmations();
    hooks.resolveConfirmation(pending[0].id, { approved: false, reason: 'nope' });

    const result = await resultPromise;
    expect(result.success).toBe(false);
    expect(result.error).toContain('denied');
  });
});