/* eslint-env jasmine */
import gitGraphAst from './gitGraphAst';
import { parser } from './parser/gitGraph';
import randomString from 'crypto-random-string';
import cryptoRandomString from 'crypto-random-string';

jest.mock('crypto-random-string');

describe('when parsing a gitGraph', function() {
  let randomNumber;
  beforeEach(function() {
    parser.yy = gitGraphAst;
    parser.yy.clear();
    randomNumber = 0;
    cryptoRandomString.mockImplementation(() => {
      randomNumber = randomNumber + 1;
      return String(randomNumber);
    });
  });
  afterEach(function() {
    cryptoRandomString.mockReset();
  });
  it('should handle a gitGraph defintion', function() {
    const str = 'gitGraph:\n' + 'commit\n';

    parser.parse(str);
    const commits = parser.yy.getCommits();

    expect(Object.keys(commits).length).toBe(1);
    expect(parser.yy.getCurrentBranch()).toBe('master');
    expect(parser.yy.getDirection()).toBe('LR');
    expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
  });

  it('should handle a gitGraph defintion with empty options', function() {
    const str = 'gitGraph:\n' + 'options\n' + 'end\n' + 'commit\n';

    parser.parse(str);
    const commits = parser.yy.getCommits();

    expect(parser.yy.getOptions()).toEqual({});
    expect(Object.keys(commits).length).toBe(1);
    expect(parser.yy.getCurrentBranch()).toBe('master');
    expect(parser.yy.getDirection()).toBe('LR');
    expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
  });

  it('should handle a gitGraph defintion with valid options', function() {
    const str = 'gitGraph:\n' + 'options\n' + '{"key": "value"}\n' + 'end\n' + 'commit\n';

    parser.parse(str);
    const commits = parser.yy.getCommits();
    expect(parser.yy.getOptions()['key']).toBe('value');
    expect(Object.keys(commits).length).toBe(1);
    expect(parser.yy.getCurrentBranch()).toBe('master');
    expect(parser.yy.getDirection()).toBe('LR');
    expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
  });

  it('should not fail on a gitGraph with malformed json', function() {
    const str = 'gitGraph:\n' + 'options\n' + '{"key": "value"\n' + 'end\n' + 'commit\n';

    parser.parse(str);
    const commits = parser.yy.getCommits();
    expect(Object.keys(commits).length).toBe(1);
    expect(parser.yy.getCurrentBranch()).toBe('master');
    expect(parser.yy.getDirection()).toBe('LR');
    expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
  });

  it('should handle set direction', function() {
    const str = 'gitGraph BT:\n' + 'commit\n';

    parser.parse(str);
    const commits = parser.yy.getCommits();

    expect(Object.keys(commits).length).toBe(1);
    expect(parser.yy.getCurrentBranch()).toBe('master');
    expect(parser.yy.getDirection()).toBe('BT');
    expect(Object.keys(parser.yy.getBranches()).length).toBe(1);
  });

  it('should checkout a branch', function() {
    const str = 'gitGraph:\n' + 'branch new\n' + 'checkout new\n';

    parser.parse(str);
    const commits = parser.yy.getCommits();

    expect(Object.keys(commits).length).toBe(0);
    expect(parser.yy.getCurrentBranch()).toBe('new');
  });

  it('should add commits to checked out branch', function() {
    const str = 'gitGraph:\n' + 'branch new\n' + 'checkout new\n' + 'commit\n' + 'commit\n';

    parser.parse(str);
    const commits = parser.yy.getCommits();

    expect(Object.keys(commits).length).toBe(2);
    expect(parser.yy.getCurrentBranch()).toBe('new');
    const branchCommit = parser.yy.getBranches()['new'];
    expect(branchCommit).not.toBeNull();
    expect(commits[branchCommit].parent).not.toBeNull();
  });
  it('should handle commit with args', function() {
    const str = 'gitGraph:\n' + 'commit "a commit"\n';

    parser.parse(str);
    const commits = parser.yy.getCommits();

    expect(Object.keys(commits).length).toBe(1);
    const key = Object.keys(commits)[0];
    expect(commits[key].message).toBe('a commit');
    expect(parser.yy.getCurrentBranch()).toBe('master');
  });

  it('it should reset a branch', function() {
    const str =
      'gitGraph:\n' +
      'commit\n' +
      'commit\n' +
      'branch newbranch\n' +
      'checkout newbranch\n' +
      'commit\n' +
      'reset master\n';

    parser.parse(str);

    const commits = parser.yy.getCommits();
    expect(Object.keys(commits).length).toBe(3);
    expect(parser.yy.getCurrentBranch()).toBe('newbranch');
    expect(parser.yy.getBranches()['newbranch']).toEqual(parser.yy.getBranches()['master']);
    expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['newbranch']);
  });

  it('reset can take an argument', function() {
    const str =
      'gitGraph:\n' +
      'commit\n' +
      'commit\n' +
      'branch newbranch\n' +
      'checkout newbranch\n' +
      'commit\n' +
      'reset master^\n';

    parser.parse(str);

    const commits = parser.yy.getCommits();
    expect(Object.keys(commits).length).toBe(3);
    expect(parser.yy.getCurrentBranch()).toBe('newbranch');
    const master = commits[parser.yy.getBranches()['master']];
    expect(parser.yy.getHead().id).toEqual(master.parent);
  });

  it('it should handle fast forwardable merges', function() {
    const str =
      'gitGraph:\n' +
      'commit\n' +
      'branch newbranch\n' +
      'checkout newbranch\n' +
      'commit\n' +
      'commit\n' +
      'checkout master\n' +
      'merge newbranch\n';

    parser.parse(str);

    const commits = parser.yy.getCommits();
    expect(Object.keys(commits).length).toBe(3);
    expect(parser.yy.getCurrentBranch()).toBe('master');
    expect(parser.yy.getBranches()['newbranch']).toEqual(parser.yy.getBranches()['master']);
    expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['newbranch']);
  });

  it('it should handle cases when merge is a noop', function() {
    const str =
      'gitGraph:\n' +
      'commit\n' +
      'branch newbranch\n' +
      'checkout newbranch\n' +
      'commit\n' +
      'commit\n' +
      'merge master\n';

    parser.parse(str);

    const commits = parser.yy.getCommits();
    expect(Object.keys(commits).length).toBe(3);
    expect(parser.yy.getCurrentBranch()).toBe('newbranch');
    expect(parser.yy.getBranches()['newbranch']).not.toEqual(parser.yy.getBranches()['master']);
    expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['newbranch']);
  });

  it('it should handle merge with 2 parents', function() {
    const str =
      'gitGraph:\n' +
      'commit\n' +
      'branch newbranch\n' +
      'checkout newbranch\n' +
      'commit\n' +
      'commit\n' +
      'checkout master\n' +
      'commit\n' +
      'merge newbranch\n';

    parser.parse(str);

    const commits = parser.yy.getCommits();
    expect(Object.keys(commits).length).toBe(5);
    expect(parser.yy.getCurrentBranch()).toBe('master');
    expect(parser.yy.getBranches()['newbranch']).not.toEqual(parser.yy.getBranches()['master']);
    expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['master']);
  });

  it('it should handle ff merge when history walk has two parents (merge commit)', function() {
    const str =
      'gitGraph:\n' +
      'commit\n' +
      'branch newbranch\n' +
      'checkout newbranch\n' +
      'commit\n' +
      'commit\n' +
      'checkout master\n' +
      'commit\n' +
      'merge newbranch\n' +
      'commit\n' +
      'checkout newbranch\n' +
      'merge master\n';

    parser.parse(str);

    const commits = parser.yy.getCommits();
    expect(Object.keys(commits).length).toBe(6);
    expect(parser.yy.getCurrentBranch()).toBe('newbranch');
    expect(parser.yy.getBranches()['newbranch']).toEqual(parser.yy.getBranches()['master']);
    expect(parser.yy.getHead().id).toEqual(parser.yy.getBranches()['master']);

    parser.yy.prettyPrint();
  });

  it('it should generate a secure random ID for commits', function() {
    const str = 'gitGraph:\n' + 'commit\n' + 'commit\n';
    const EXPECTED_LENGTH = 7;
    const EXPECTED_CHARACTERS = '0123456789abcdef';

    let idCount = 0;
    randomString.mockImplementation(options => {
      if (
        options.length === EXPECTED_LENGTH &&
        options.characters === EXPECTED_CHARACTERS &&
        Object.keys(options).length === 2
      ) {
        const id = `abcdef${idCount}`;
        idCount += 1;
        return id;
      }
      return 'unexpected-ID';
    });

    parser.parse(str);
    const commits = parser.yy.getCommits();

    expect(Object.keys(commits)).toEqual(['abcdef0', 'abcdef1']);
    Object.keys(commits).forEach(key => {
      expect(commits[key].id).toEqual(key);
    });
  });

  it('it should generate an array of known branches', function() {
    const str =
      'gitGraph:\n' +
      'commit\n' +
      'branch b1\n' +
      'checkout b1\n' +
      'commit\n' +
      'commit\n' +
      'branch b2\n';

    parser.parse(str);
    const branches = gitGraphAst.getBranchesAsObjArray();

    expect(branches).toHaveLength(3);
    expect(branches[0]).toHaveProperty('name', 'master');
    expect(branches[1]).toHaveProperty('name', 'b1');
    expect(branches[2]).toHaveProperty('name', 'b2');
  });
});