'use strict';
require('../common');
const assert = require('assert');
const helper = require('./inspector-helper.js');

let scopeId;

function checkListResponse(response) {
  assert.strictEqual(1, response.length);
  assert.ok(response[0]['devtoolsFrontendUrl']);
  assert.strictEqual('ws://localhost:' + this.port + '/node',
                     response[0]['webSocketDebuggerUrl']);
}

function expectMainScriptSource(result) {
  const expected = helper.mainScriptSource();
  const source = result['scriptSource'];
  assert(source && (source.indexOf(expected) >= 0),
         'Script source is wrong: ' + source);
}

function setupExpectBreakOnLine(line, url, session, scopeIdCallback) {
  return function(message) {
    if ('Debugger.paused' === message['method']) {
      const callFrame = message['params']['callFrames'][0];
      const location = callFrame['location'];
      assert.strictEqual(url, session.scriptUrlForId(location['scriptId']));
      assert.strictEqual(line, location['lineNumber']);
      scopeIdCallback &&
          scopeIdCallback(callFrame['scopeChain'][0]['object']['objectId']);
      return true;
    }
  };
}

function setupExpectConsoleOutput(type, values) {
  if (!(values instanceof Array))
    values = [ values ];
  return function(message) {
    if ('Runtime.consoleAPICalled' === message['method']) {
      const params = message['params'];
      if (params['type'] === type) {
        let i = 0;
        for (const value of params['args']) {
          if (value['value'] !== values[i++])
            return false;
        }
        return i === values.length;
      }
    }
  };
}

function setupExpectScopeValues(expected) {
  return function(result) {
    for (const actual of result['result']) {
      const value = expected[actual['name']];
      if (value)
        assert.strictEqual(value, actual['value']['value']);
    }
  };
}

function setupExpectValue(value) {
  return function(result) {
    assert.strictEqual(value, result['result']['value']);
  };
}

function testBreakpointOnStart(session) {
  console.log('[test]',
              'Verifying debugger stops on start (--debug-brk option)');
  const commands = [
    { 'method': 'Runtime.enable' },
    { 'method': 'Debugger.enable' },
    { 'method': 'Debugger.setPauseOnExceptions',
      'params': {'state': 'none'} },
    { 'method': 'Debugger.setAsyncCallStackDepth',
      'params': {'maxDepth': 0} },
    { 'method': 'Profiler.enable' },
    { 'method': 'Profiler.setSamplingInterval',
      'params': {'interval': 100} },
    { 'method': 'Debugger.setBlackboxPatterns',
      'params': {'patterns': []} },
    { 'method': 'Runtime.runIfWaitingForDebugger' }
  ];

  session.
    sendInspectorCommands(commands).
    expectMessages(setupExpectBreakOnLine(0, session.mainScriptPath, session));
}

function testSetBreakpointAndResume(session) {
  console.log('[test]', 'Setting a breakpoint and verifying it is hit');
  const commands = [
      { 'method': 'Debugger.setBreakpointByUrl',
        'params': { 'lineNumber': 5,
                     'url': session.mainScriptPath,
                     'columnNumber': 0,
                     'condition': ''
                   }
      },
      { 'method': 'Debugger.resume'},
      [ { 'method': 'Debugger.getScriptSource',
          'params': { 'scriptId': session.mainScriptId } },
        expectMainScriptSource ],
  ];
  session.
    sendInspectorCommands(commands).
    expectMessages([
      setupExpectConsoleOutput('log', ['A message', 5]),
      setupExpectBreakOnLine(5, session.mainScriptPath,
                             session, (id) => scopeId = id),
    ]);
}

function testInspectScope(session) {
  console.log('[test]', 'Verify we can read current application state');
  session.sendInspectorCommands([
    [
      {
        'method': 'Runtime.getProperties',
        'params': {
          'objectId': scopeId,
          'ownProperties': false,
          'accessorPropertiesOnly': false,
          'generatePreview': true
        }
      }, setupExpectScopeValues({t: 1001, k: 1})
    ],
    [
      {
        'method': 'Debugger.evaluateOnCallFrame', 'params': {
          'callFrameId': '{\"ordinal\":0,\"injectedScriptId\":1}',
          'expression': 'k + t',
          'objectGroup': 'console',
          'includeCommandLineAPI': true,
          'silent': false,
          'returnByValue': false,
          'generatePreview': true
        }
      }, setupExpectValue(1002)
    ],
    [
      {
        'method': 'Runtime.evaluate', 'params': {
          'expression': '5 * 5'
        }
      }, (message) => assert.strictEqual(25, message['result']['value'])
    ],
  ]);
}

function testWaitsForFrontendDisconnect(session, harness) {
  console.log('[test]', 'Verify node waits for the frontend to disconnect');
  session.sendInspectorCommands({ 'method': 'Debugger.resume'}).
    expectStderrOutput('Waiting for the debugger to disconnect...').
    disconnect(true);
}

function runTests(harness) {
  harness
    .testHttpResponse('/json', checkListResponse)
    .testHttpResponse('/json/list', checkListResponse)
    .testHttpResponse('/json/version', assert.ok)
    .runFrontendSession([
      testBreakpointOnStart,
      testSetBreakpointAndResume,
      testInspectScope,
      testWaitsForFrontendDisconnect
    ]).expectShutDown(55);
}

helper.startNodeForInspectorTest(runTests);