local createLibTest = require('/apis/libtest');
local createMcpComputer = require('/apis/libmcpcomputer');

local testlib = createLibTest({ ... });

local function packed(...)
  return table.pack(...);
end

local function fakeOs(id, label)
  return {
    getComputerID = function() return id; end,
    getComputerLabel = function() return label; end,
  };
end

testlib.test('parseArgs accepts positional URL', function()
  local mcpComputer = createMcpComputer();
  local config = mcpComputer.parseArgs(packed('ws://127.0.0.1:3001'));

  testlib.assertEquals(config.url, 'ws://127.0.0.1:3001');
end);

testlib.test('parseArgs accepts -url option', function()
  local mcpComputer = createMcpComputer();
  local config = mcpComputer.parseArgs(packed('-url', 'ws://bridge:3001'));

  testlib.assertEquals(config.url, 'ws://bridge:3001');
end);

testlib.test('parseArgs rejects missing URL', function()
  local mcpComputer = createMcpComputer();
  local config, err = mcpComputer.parseArgs(packed());

  testlib.assertEquals(config, nil);
  testlib.assertTrue(string.find(err, 'missing websocket URL', 1, true));
end);

testlib.test('formatPong includes computer id and label', function()
  local mcpComputer = createMcpComputer();

  testlib.assertEquals(mcpComputer.formatPong(fakeOs(12, 'base-turtle')), 'pong from 12 (Label: base-turtle)');
end);

testlib.test('formatPong renders missing or empty labels as null', function()
  local mcpComputer = createMcpComputer();

  testlib.assertEquals(mcpComputer.formatPong(fakeOs(7, nil)), 'pong from 7 (Label: null)');
  testlib.assertEquals(mcpComputer.formatPong(fakeOs(8, '')), 'pong from 8 (Label: null)');
end);

testlib.test('hello identifies the current computer', function()
  local mcpComputer = createMcpComputer();
  local hello = mcpComputer.hello(fakeOs(3, 'agent'));

  testlib.assertEquals(hello.type, 'hello');
  testlib.assertEquals(hello.computerId, 3);
  testlib.assertEquals(hello.computerLabel, 'agent');
end);

testlib.test('handleRequest responds to ping', function()
  local mcpComputer = createMcpComputer();
  local response = mcpComputer.handleRequest({
    type = 'request',
    id = 'req-1',
    method = 'ping',
  }, fakeOs(42, 'worker'));

  testlib.assertEquals(response.type, 'response');
  testlib.assertEquals(response.id, 'req-1');
  testlib.assertEquals(response.ok, true);
  testlib.assertEquals(response.result, 'pong from 42 (Label: worker)');
end);

testlib.test('executeLua captures output and return values', function()
  local mcpComputer = createMcpComputer();
  local result = mcpComputer.executeLua("print('hello', 'world'); write('tail'); return 2 + 3, nil, 'ok'");

  testlib.assertEquals(result.ok, true);
  testlib.assertEquals(result.output, 'hello\tworld\ntail');
  testlib.assertEquals(result.returns[1].type, 'number');
  testlib.assertEquals(result.returns[1].value, 5);
  testlib.assertEquals(result.returns[2].type, 'nil');
  testlib.assertEquals(result.returns[3].type, 'string');
  testlib.assertEquals(result.returns[3].value, 'ok');
end);

testlib.test('executeLua reports runtime errors with captured output', function()
  local mcpComputer = createMcpComputer();
  local result = mcpComputer.executeLua("print('before'); error('boom', 0)");

  testlib.assertEquals(result.ok, false);
  testlib.assertEquals(result.output, 'before\n');
  testlib.assertTrue(string.find(result.error, 'boom', 1, true));
end);

testlib.test('handleRequest executes lua code', function()
  local mcpComputer = createMcpComputer();
  local response = mcpComputer.handleRequest({
    type = 'request',
    id = 'req-exec',
    method = 'exec-lua',
    params = { code = "print('ran'); return true" },
  }, fakeOs(42, 'worker'));

  testlib.assertEquals(response.type, 'response');
  testlib.assertEquals(response.id, 'req-exec');
  testlib.assertEquals(response.ok, true);
  testlib.assertEquals(response.result.output, 'ran\n');
  testlib.assertEquals(response.result.returns[1].type, 'boolean');
  testlib.assertEquals(response.result.returns[1].value, true);
end);

testlib.test('handleRequest reports unknown methods', function()
  local mcpComputer = createMcpComputer();
  local response = mcpComputer.handleRequest({
    type = 'request',
    id = 'req-2',
    method = 'dance',
  }, fakeOs(42, 'worker'));

  testlib.assertEquals(response.type, 'response');
  testlib.assertEquals(response.id, 'req-2');
  testlib.assertEquals(response.ok, false);
  testlib.assertEquals(response.error, 'unknown method');
end);

testlib.test('handleRequest ignores malformed frames', function()
  local mcpComputer = createMcpComputer();

  testlib.assertEquals(mcpComputer.handleRequest({ type = 'request', method = 'ping' }, fakeOs(1, nil)), nil);
  testlib.assertEquals(mcpComputer.handleRequest({ type = 'hello' }, fakeOs(1, nil)), nil);
end);

testlib.run();