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('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();