// Copyright 2015 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import consoleLogLevel = require('console-log-level');
import * as stackdriver from '../src/types/stackdriver';

// TODO: Have this actually implement Breakpoint
const breakpointInFoo: stackdriver.Breakpoint = {
  id: 'fake-id-123',
  location: {path: 'test-duplicate-expressions-code.js', line: 4},
} as stackdriver.Breakpoint;

import * as assert from 'assert';
import {afterEach, beforeEach, describe, it} from 'mocha';
import * as extend from 'extend';
import * as debugapi from '../src/agent/v8/debugapi';
import {defaultConfig} from '../src/agent/config';
import * as SourceMapper from '../src/agent/io/sourcemapper';
import * as scanner from '../src/agent/io/scanner';
import {Debuglet} from '../src/agent/debuglet';
// eslint-disable-next-line @typescript-eslint/no-var-requires
const foo = require('./test-duplicate-expressions-code.js');

// TODO: Determine why this must be named `stateIsClean1`.
function stateIsClean1(api: debugapi.DebugApi): boolean {
  assert.strictEqual(
    api.numBreakpoints_(),
    0,
    'there should be no breakpoints active'
  );
  assert.strictEqual(
    api.numListeners_(),
    0,
    'there should be no listeners active'
  );
  return true;
}

describe(__filename, () => {
  const config = extend({}, defaultConfig, {
    workingDirectory: __dirname,
    forceNewAgent_: true,
  });
  const logger = consoleLogLevel({
    level: Debuglet.logLevelToName(config.logLevel),
  });
  let api: debugapi.DebugApi;

  beforeEach(done => {
    if (!api) {
      scanner.scan(config.workingDirectory, /.js$/).then(async fileStats => {
        assert.strictEqual(fileStats.errors().size, 0);
        const jsStats = fileStats.selectStats(/.js$/);
        const mapFiles = fileStats.selectFiles(/.map$/, process.cwd());
        const mapper = await SourceMapper.create(mapFiles, logger);
        // TODO: Handle the case when mapper is undefined
        // TODO: Handle the case when v8debugapi.create returns null
        api = debugapi.create(
          logger,
          config,
          jsStats,
          mapper as SourceMapper.SourceMapper
        ) as debugapi.DebugApi;
        assert.ok(api, 'should be able to create the api');
        done();
      });
    } else {
      assert(stateIsClean1(api));
      done();
    }
  });
  afterEach(() => {
    assert(stateIsClean1(api));
  });

  it('should not duplicate expressions', done => {
    api.set(breakpointInFoo, err1 => {
      assert.ifError(err1);
      api.wait(breakpointInFoo, err2 => {
        assert.ifError(err2);
        // TODO: Determine how to remove this cast to any.
        const frames = breakpointInFoo.stackFrames[0];
        const exprs = frames.arguments.concat(frames.locals);
        const varTableIndicesSeen: number[] = [];
        exprs.forEach(expr => {
          // TODO: Handle the case when expr.varTableIndex is undefined
          assert.strictEqual(
            varTableIndicesSeen.indexOf(expr.varTableIndex as number),
            -1
          );
          varTableIndicesSeen.push(expr.varTableIndex as number);
        });
        api.clear(breakpointInFoo, err => {
          assert.ifError(err);
          done();
        });
      });
      process.nextTick(foo);
    });
  });
});
