/**
 * @license
 * Copyright Google LLC All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */

// Imports
import * as validateConfig from './config';
import {validateCommitMessage} from './validate';

type CommitMessageConfig = validateConfig.CommitMessageConfig;


// Constants
const config: {commitMessage: CommitMessageConfig} = {
  commitMessage: {
    maxLineLength: 120,
    minBodyLength: 0,
    scopes: [
      'common',
      'compiler',
      'core',
      'packaging',
    ]
  }
};
const TYPES = Object.keys(validateConfig.COMMIT_TYPES).join(', ');
const SCOPES = config.commitMessage.scopes.join(', ');
const INVALID = false;
const VALID = true;

// TODO(josephperrott): Clean up tests to test script rather than for
// specific commit messages we want to use.
describe('validate-commit-message.js', () => {
  let lastError: string = '';

  beforeEach(() => {
    lastError = '';

    spyOn(console, 'error').and.callFake((msg: string) => lastError = msg);
    spyOn(validateConfig, 'getCommitMessageConfig')
        .and.returnValue(config as ReturnType<typeof validateConfig.getCommitMessageConfig>);
  });

  describe('validateMessage()', () => {
    it('should be valid', () => {
      expect(validateCommitMessage('feat(packaging): something')).toBe(VALID);
      expect(lastError).toBe('');

      expect(validateCommitMessage('fix(packaging): something')).toBe(VALID);
      expect(lastError).toBe('');

      expect(validateCommitMessage('fixup! fix(packaging): something')).toBe(VALID);
      expect(lastError).toBe('');

      expect(validateCommitMessage('squash! fix(packaging): something')).toBe(VALID);
      expect(lastError).toBe('');

      expect(validateCommitMessage('Revert: "fix(packaging): something"')).toBe(VALID);
      expect(lastError).toBe('');
    });

    it('should validate max length', () => {
      const msg =
          'fix(compiler): something super mega extra giga tera long, maybe even longer and longer and longer and longer and longer and longer...';

      expect(validateCommitMessage(msg)).toBe(INVALID);
      expect(lastError).toContain(`The commit message header is longer than ${
          config.commitMessage.maxLineLength} characters`);
    });

    it('should skip max length limit for URLs', () => {
      const msg = 'fix(compiler): this is just an usual commit message tile\n\n' +
          'This is a normal commit message body which does not exceed the max length\n' +
          'limit. For more details see the following super long URL:\n\n' +
          'https://github.com/angular/components/commit/e2ace018ddfad10608e0e32932c43dcfef4095d7#diff-9879d6db96fd29134fc802214163b95a';

      expect(validateCommitMessage(msg)).toBe(VALID);
    });

    it('should validate "<type>(<scope>): <subject>" format', () => {
      const msg = 'not correct format';

      expect(validateCommitMessage(msg)).toBe(INVALID);
      expect(lastError).toContain(`The commit message header does not match the expected format.`);
    });

    it('should fail when type is invalid', () => {
      const msg = 'weird(core): something';

      expect(validateCommitMessage(msg)).toBe(INVALID);
      expect(lastError).toContain(`'weird' is not an allowed type.\n => TYPES: ${TYPES}`);
    });

    it('should fail when scope is invalid', () => {
      const errorMessageFor = (scope: string, header: string) =>
          `'${scope}' is not an allowed scope.\n => SCOPES: ${SCOPES}`;

      expect(validateCommitMessage('fix(Compiler): something')).toBe(INVALID);
      expect(lastError).toContain(errorMessageFor('Compiler', 'fix(Compiler): something'));

      expect(validateCommitMessage('feat(bah): something')).toBe(INVALID);
      expect(lastError).toContain(errorMessageFor('bah', 'feat(bah): something'));

      expect(validateCommitMessage('fix(webworker): something')).toBe(INVALID);
      expect(lastError).toContain(errorMessageFor('webworker', 'fix(webworker): something'));

      expect(validateCommitMessage('refactor(security): something')).toBe(INVALID);
      expect(lastError).toContain(errorMessageFor('security', 'refactor(security): something'));

      expect(validateCommitMessage('refactor(docs): something')).toBe(INVALID);
      expect(lastError).toContain(errorMessageFor('docs', 'refactor(docs): something'));

      expect(validateCommitMessage('feat(angular): something')).toBe(INVALID);
      expect(lastError).toContain(errorMessageFor('angular', 'feat(angular): something'));
    });

    it('should allow empty scope', () => {
      expect(validateCommitMessage('build: blablabla')).toBe(VALID);
      expect(lastError).toBe('');
    });

    // We do not want to allow WIP. It is OK to fail the PR build in this case to show that there is
    // work still to be done (i.e. fixing the commit message).
    it('should not allow "WIP: ..." syntax', () => {
      const msg = 'WIP: fix: something';

      expect(validateCommitMessage(msg)).toBe(INVALID);
      expect(lastError).toContain(`'WIP' is not an allowed type.\n => TYPES: ${TYPES}`);
    });

    describe('(revert)', () => {
      it('should allow valid "revert: ..." syntaxes', () => {
        expect(validateCommitMessage('revert: anything')).toBe(VALID);
        expect(lastError).toBe('');

        expect(validateCommitMessage('Revert: "anything"')).toBe(VALID);
        expect(lastError).toBe('');

        expect(validateCommitMessage('revert anything')).toBe(VALID);
        expect(lastError).toBe('');

        expect(validateCommitMessage('rEvErT anything')).toBe(VALID);
        expect(lastError).toBe('');
      });

      it('should not allow "revert(scope): ..." syntax', () => {
        const msg = 'revert(compiler): reduce generated code payload size by 65%';

        expect(validateCommitMessage(msg)).toBe(INVALID);
        expect(lastError).toContain(`'revert' is not an allowed type.\n => TYPES: ${TYPES}`);
      });

      // https://github.com/angular/angular/issues/23479
      it('should allow typical Angular messages generated by git', () => {
        const msg =
            'Revert "fix(compiler): Pretty print object instead of [Object object] (#22689)" (#23442)';

        expect(validateCommitMessage(msg)).toBe(VALID);
        expect(lastError).toBe('');
      });
    });

    describe('(squash)', () => {
      describe('without `disallowSquash`', () => {
        it('should return commits as valid', () => {
          expect(validateCommitMessage('squash! feat(core): add feature')).toBe(VALID);
          expect(validateCommitMessage('squash! fix: a bug')).toBe(VALID);
          expect(validateCommitMessage('squash! fix a typo')).toBe(VALID);
        });
      });

      describe('with `disallowSquash`', () => {
        it('should fail', () => {
          expect(validateCommitMessage('fix(core): something', {disallowSquash: true})).toBe(VALID);
          expect(validateCommitMessage('squash! fix(core): something', {
            disallowSquash: true
          })).toBe(INVALID);
          expect(lastError).toContain(
              'The commit must be manually squashed into the target commit');
        });
      });
    });

    describe('(fixup)', () => {
      describe('without `nonFixupCommitHeaders`', () => {
        it('should return commits as valid', () => {
          expect(validateCommitMessage('fixup! feat(core): add feature')).toBe(VALID);
          expect(validateCommitMessage('fixup! fix: a bug')).toBe(VALID);
          expect(validateCommitMessage('fixup! fixup! fix: a bug')).toBe(VALID);
        });
      });

      describe('with `nonFixupCommitHeaders`', () => {
        it('should check that the fixup commit matches a non-fixup one', () => {
          const msg = 'fixup! foo';

          expect(validateCommitMessage(
                     msg, {disallowSquash: false, nonFixupCommitHeaders: ['foo', 'bar', 'baz']}))
              .toBe(VALID);
          expect(validateCommitMessage(
                     msg, {disallowSquash: false, nonFixupCommitHeaders: ['bar', 'baz', 'foo']}))
              .toBe(VALID);
          expect(validateCommitMessage(
                     msg, {disallowSquash: false, nonFixupCommitHeaders: ['baz', 'foo', 'bar']}))
              .toBe(VALID);

          expect(validateCommitMessage(
                     msg, {disallowSquash: false, nonFixupCommitHeaders: ['qux', 'quux', 'quuux']}))
              .toBe(INVALID);
          expect(lastError).toContain(
              'Unable to find match for fixup commit among prior commits: \n' +
              '      qux\n' +
              '      quux\n' +
              '      quuux');
        });

        it('should fail if `nonFixupCommitHeaders` is empty', () => {
          expect(validateCommitMessage('refactor(core): make reactive', {
            disallowSquash: false,
            nonFixupCommitHeaders: []
          })).toBe(VALID);
          expect(validateCommitMessage(
                     'fixup! foo', {disallowSquash: false, nonFixupCommitHeaders: []}))
              .toBe(INVALID);
          expect(lastError).toContain(
              `Unable to find match for fixup commit among prior commits: -`);
        });
      });
    });

    describe('minBodyLength', () => {
      const minBodyLengthConfig: {commitMessage: CommitMessageConfig} = {
        commitMessage: {
          maxLineLength: 120,
          minBodyLength: 30,
          minBodyLengthTypeExcludes: ['docs'],
          scopes: ['core']
        }
      };

      beforeEach(() => {
        (validateConfig.getCommitMessageConfig as jasmine.Spy).and.returnValue(minBodyLengthConfig);
      });

      it('should fail validation if the body is shorter than `minBodyLength`', () => {
        expect(validateCommitMessage(
                   'fix(core): something\n\n Explanation of the motivation behind this change'))
            .toBe(VALID);
        expect(validateCommitMessage('fix(core): something\n\n too short')).toBe(INVALID);
        expect(lastError).toContain(
            'The commit message body does not meet the minimum length of 30 characters');
        expect(validateCommitMessage('fix(core): something')).toBe(INVALID);
        expect(lastError).toContain(
            'The commit message body does not meet the minimum length of 30 characters');
      });

      it('should pass validation if the body is shorter than `minBodyLength` but the commit type is in the `minBodyLengthTypeExclusions` list',
         () => {
           expect(validateCommitMessage('docs: just fixing a typo')).toBe(VALID);
           expect(validateCommitMessage('docs(core): just fixing a typo')).toBe(VALID);
           expect(validateCommitMessage(
                      'docs(core): just fixing a typo\n\nThis was just a silly typo.'))
               .toBe(VALID);
         });
    });
  });
});