// 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 * as assert from 'assert';
import {afterEach, beforeEach, describe, it} from 'mocha';
import * as extend from 'extend';

import {defaultConfig} from '../src/agent/config';
import {Debuglet} from '../src/agent/debuglet';
import * as scanner from '../src/agent/io/scanner';
import * as SourceMapper from '../src/agent/io/sourcemapper';
import * as debugapi from '../src/agent/v8/debugapi';
import consoleLogLevel = require('console-log-level');
import * as stackdriver from '../src/types/stackdriver';

// eslint-disable-next-line @typescript-eslint/no-var-requires
const foo = require('./test-try-catch-code.js');

function stateIsClean(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(stateIsClean(api));
      done();
    }
  });
  afterEach(() => {
    assert(stateIsClean(api));
  });
  it('Should read e as the caught error', done => {
    // TODO: Have this actually implement Breakpoint
    const brk: stackdriver.Breakpoint = {
      id: 'fake-id-123',
      location: {path: 'test-try-catch-code.js', line: 7},
    } as stackdriver.Breakpoint;
    api.set(brk, err1 => {
      assert.ifError(err1);
      api.wait(brk, err2 => {
        assert.ifError(err2);
        const frame = brk.stackFrames[0];
        const args = frame.arguments;
        const locals = frame.locals;
        assert.strictEqual(locals.length, 1, 'There should be one local');
        assert.strictEqual(args.length, 0, 'There should be zero arguments');
        const e = locals[0];
        assert(e.name === 'e');
        // Number.isInteger will return false if varTableIndex is `undefined`
        assert(Number.isInteger(e.varTableIndex!));
        assert.strictEqual(args.length, 0, 'There should be zero arguments');
        api.clear(brk, err3 => {
          assert.ifError(err3);
          done();
        });
      });
      process.nextTick(foo.bind(null, 'test'));
    });
  });
  it('Should read e as the local error', done => {
    // TODO: Have this actually implement Breakpoint
    const brk: stackdriver.Breakpoint = {
      id: 'fake-id-123',
      location: {path: 'test-try-catch-code.js', line: 8},
    } as stackdriver.Breakpoint;
    api.set(brk, err1 => {
      assert.ifError(err1);
      api.wait(brk, err2 => {
        assert.ifError(err2);
        const frame = brk.stackFrames[0];
        const args = frame.arguments;
        const locals = frame.locals;
        assert.strictEqual(args.length, 0, 'There should be zero arguments');
        assert.strictEqual(locals.length, 1, 'There should be one local');
        assert.deepStrictEqual(locals[0], {name: 'e', value: '2'});
        assert.strictEqual(args.length, 0, 'There should be zero arguments');
        api.clear(brk, err3 => {
          assert.ifError(err3);
          done();
        });
      });
      process.nextTick(foo.bind(null, 'test'));
    });
  });
});
