// 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.

process.env.GCLOUD_DIAGNOSTICS_CONFIG = 'test/fixtures/test-config.js';

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

import * as assert from 'assert';
import {before, describe, it} from 'mocha';
import * as extend from 'extend';
import * as debugapi from '../src/agent/v8/debugapi';
import * as SourceMapper from '../src/agent/io/sourcemapper';
import * as scanner from '../src/agent/io/scanner';
import {Debuglet} from '../src/agent/debuglet';
import {defaultConfig} from '../src/agent/config';
// eslint-disable-next-line @typescript-eslint/no-var-requires
const foo = require('./test-max-data-size-code.js');
let api: debugapi.DebugApi;

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

describe('maxDataSize', () => {
  const config = extend({}, defaultConfig, {forceNewAgent_: true});

  before(done => {
    if (!api) {
      const logger = consoleLogLevel({
        level: Debuglet.logLevelToName(config.logLevel),
      });
      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;
        done();
      });
    } else {
      done();
    }
  });

  it('should limit data reported', done => {
    const oldMaxData = config.capture.maxDataSize;
    config.capture.maxDataSize = 5;
    // clone a clean breakpointInFoo
    // TODO: Have this actually implement Breakpoint.
    const bp: stackdriver.Breakpoint = {
      id: breakpointInFoo.id,
      location: breakpointInFoo.location,
    } as stackdriver.Breakpoint;
    // TODO: Determine how to remove this cast to any.
    api.set(bp, err1 => {
      assert.ifError(err1);
      api.wait(bp, (err2?: Error) => {
        assert.ifError(err2);
        assert(
          bp.variableTable.some(v => {
            return v!.status!.description.format === 'Max data size reached';
          })
        );
        api.clear(bp, err3 => {
          config.capture.maxDataSize = oldMaxData;
          assert.ifError(err3);
          done();
        });
      });
      process.nextTick(() => {
        foo(2);
      });
    });
  });

  it('should be unlimited if 0', done => {
    const oldMaxData = config.capture.maxDataSize;
    config.capture.maxDataSize = 0;
    // clone a clean breakpointInFoo
    // TODO: Have this actually implement breakpoint
    const bp: stackdriver.Breakpoint = {
      id: breakpointInFoo.id,
      location: breakpointInFoo.location,
    } as stackdriver.Breakpoint;
    api.set(bp, err1 => {
      assert.ifError(err1);
      api.wait(bp, (err2?: Error) => {
        assert.ifError(err2);
        // TODO: The function supplied to reduce is of the wrong type.
        //       Fix this.
        assert(
          bp.variableTable.reduce(
            (
              acc: Function | stackdriver.Variable | null,
              elem: stackdriver.Variable | null
            ) => {
              return (
                acc &&
                ((!elem!.status ||
                  elem!.status!.description.format !==
                    'Max data size reached') as {} as stackdriver.Variable)
              );
            }
          )
        );
        api.clear(bp, err3 => {
          config.capture.maxDataSize = oldMaxData;
          assert.ifError(err3);
          done();
        });
      });
      process.nextTick(() => {
        foo(2);
      });
    });
  });
});