describe('api/github', () => {
  let github;
  let ghGot;
  beforeEach(() => {
    // clean up env
    delete process.env.GITHUB_TOKEN;
    delete process.env.GITHUB_ENDPOINT;

    // reset module
    jest.resetModules();
    jest.mock('gh-got');
    github = require('../../lib/api/github');
    ghGot = require('gh-got');
  });

  async function initRepo(...args) {
    // repo info
    ghGot.mockImplementationOnce(() => ({
      body: {
        owner: {
          login: 'theowner',
        },
        default_branch: 'master',
      },
    }));
    // getBranchCommit
    ghGot.mockImplementationOnce(() => ({
      body: {
        object: {
          sha: '1234',
        },
      },
    }));
    // getCommitTree
    ghGot.mockImplementationOnce(() => ({
      body: {
        tree: {
          sha: '5678',
        },
      },
    }));
    return github.initRepo(...args);
  }

  describe('initRepo', () => {
    [
      [undefined, ['mytoken'], 'mytoken', undefined],
      [undefined, ['mytoken', 'https://my.custom.endpoint/'], 'mytoken', 'https://my.custom.endpoint/'],
      ['myenvtoken', [], 'myenvtoken', undefined],
    ].forEach(([envToken, args, token, endpoint], i) => {
      it(`should initialise the config for the repo - ${i}`, async () => {
        if (envToken !== undefined) {
          process.env.GITHUB_TOKEN = envToken;
        }
        const config = await initRepo('some/repo', ...args);
        expect(ghGot.mock.calls).toMatchSnapshot();
        expect(config).toMatchSnapshot();
        expect(process.env.GITHUB_TOKEN).toBe(token);
        expect(process.env.GITHUB_ENDPOINT).toBe(endpoint);
      });
    });
    it('should throw an error if no token is provided', async () => {
      let err;
      try {
        await github.initRepo('some/repo');
      } catch (e) {
        err = e;
      }
      expect(err.message).toBe('No token found for GitHub repository some/repo');
    });
  });
  describe('findFilePaths(fileName)', () => {
    it('should return the files matching the fileName', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: {
          items: [
              { name: 'package.json', path: '/package.json' },
              { name: 'package.json.something-else', path: 'some-dir/package.json.some-thing-else' },
              { name: 'package.json', path: 'src/app/package.json' },
              { name: 'package.json', path: 'src/otherapp/package.json' },
          ],
        },
      }));
      const files = await github.findFilePaths('package.json');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(files).toMatchSnapshot();
    });
  });
  describe('branchExists(branchName)', () => {
    it('should return true if the branch exists', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        statusCode: 200,
      }));
      const exists = await github.branchExists('thebranchname');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(exists).toBe(true);
    });
    it('should return false if a non-200 response is returned', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        statusCode: 123,
      }));
      const exists = await github.branchExists('thebranchname');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(exists).toBe(false);
    });
    it('should return false if a 404 is returned', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => Promise.reject({
        statusCode: 404,
      }));
      const exists = await github.branchExists('thebranchname');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(exists).toBe(false);
    });
    it('should propagate unknown errors', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => Promise.reject(new Error('Something went wrong')));
      let err;
      try {
        await github.branchExists('thebranchname');
      } catch (e) {
        err = e;
      }
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(err.message).toBe('Something went wrong');
    });
  });
  describe('getBranchPr(branchName)', () => {
    it('should return null if no PR exists', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: [],
      }));
      const pr = await github.getBranchPr('somebranch');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(pr).toBe(null);
    });
    it('should return the PR object', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: [
            { number: 91 },
        ],
      }));
      ghGot.mockImplementationOnce(() => ({
        body: {
          number: 91,
          additions: 1,
          deletions: 1,
          commits: 1,
          base: {
            sha: '1234',
          },
        },
      }));
      const pr = await github.getBranchPr('somebranch');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(pr).toMatchSnapshot();
    });
  });
  describe('addAssignees(issueNo, assignees)', () => {
    it('should add the given assignees to the issue', async () => {
      await initRepo('some/repo', 'token');
      await github.addAssignees(42, ['someuser', 'someotheruser']);
      expect(ghGot.post.mock.calls).toMatchSnapshot();
    });
  });
  describe('addReviewers(issueNo, reviewers)', () => {
    it('should add the given reviewers to the PR', async () => {
      await initRepo('some/repo', 'token');
      await github.addReviewers(42, ['someuser', 'someotheruser']);
      expect(ghGot.post.mock.calls).toMatchSnapshot();
    });
  });
  describe('addLabels(issueNo, labels)', () => {
    it('should add the given labels to the issue', async () => {
      await initRepo('some/repo', 'token');
      await github.addLabels(42, ['foo', 'bar']);
      expect(ghGot.post.mock.calls).toMatchSnapshot();
    });
  });
  describe('findPr(branchName, prTitle, state)', () => {
    it('should return a PR object', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: [
            { title: 'PR Title', state: 'open', number: 42 },
        ],
      }));
      const pr = await github.findPr('master', 'PR Title');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(pr).toMatchSnapshot();
    });
    it('should return null if no PR\'s are found', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: [],
      }));
      const pr = await github.findPr('master', 'PR Title');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(pr).toBe(null);
    });
    it('should set the isClosed attribute of the PR to true if the PR is closed', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: [
            { title: 'PR Title', state: 'closed', number: 42 },
        ],
      }));
      const pr = await github.findPr('master');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(pr).toMatchSnapshot();
    });
  });
  describe('checkForClosedPr(branchName, prTitle)', () => {
    [
      ['some-branch', 'foo', true],
      ['some-branch', 'bar', false],
      ['some-branch', 'bop', false],
    ].forEach(([branch, title, expected], i) => {
      it(`should return true if a closed PR is found - ${i}`, async () => {
        await initRepo('some/repo', 'token');
        ghGot.mockImplementationOnce(() => ({
          body: [
              { title: 'foo', head: { label: 'theowner:some-branch' } },
              { title: 'bar', head: { label: 'theowner:some-other-branch' } },
              { title: 'baz', head: { label: 'theowner:some-branch' } },
          ],
        }));
        const res = await github.checkForClosedPr(branch, title);
        expect(res).toBe(expected);
      });
    });
  });
  describe('createPr(branchName, title, body)', () => {
    it('should create and return a PR object', async () => {
      await initRepo('some/repo', 'token');
      ghGot.post.mockImplementationOnce(() => ({
        body: {
          number: 123,
        },
      }));
      const pr = await github.createPr('some-branch', 'The Title', 'Hello world');
      expect(pr).toMatchSnapshot();
      expect(ghGot.post.mock.calls).toMatchSnapshot();
    });
  });
  describe('getPr(prNo)', () => {
    it('should return null if no prNo is passed', async () => {
      const pr = await github.getPr(null);
      expect(pr).toBe(null);
    });
    it('should return null if no PR is returned from GitHub', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: null,
      }));
      const pr = await github.getPr(1234);
      expect(pr).toBe(null);
    });
    [
      { number: 1, state: 'closed', base: { sha: '1234' } },
      { number: 1, state: 'open', mergeable_state: 'dirty', base: { sha: '1234' } },
      { number: 1, state: 'open', base: { sha: '5678' } },
    ].forEach((body, i) => {
      it(`should return a PR object - ${i}`, async () => {
        await initRepo('some/repo', 'token');
        ghGot.mockImplementationOnce(() => ({
          body,
        }));
        const pr = await github.getPr(1234);
        expect(pr).toMatchSnapshot();
      });
    });
  });
  describe('updatePr(prNo, title, body)', () => {
    it('should update the PR', async () => {
      await initRepo('some/repo', 'token');
      await github.updatePr(1234, 'The New Title', 'Hello world again');
      expect(ghGot.patch.mock.calls).toMatchSnapshot();
    });
  });
  describe('getFile(filePatch, branchName)', () => {
    it('should return the encoded file content', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: {
          content: 'hello',
        },
      }));
      const content = await github.getFile('package.json');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(content).toBe('hello');
    });
  });
  describe('getFileContent(filePatch, branchName)', () => {
    it('should return the encoded file content', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: {
          content: Buffer.from('hello world').toString('base64'),
        },
      }));
      const content = await github.getFileContent('package.json');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(content).toBe('hello world');
    });
    it('should return null if GitHub returns a 404', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => {
        const error = new Error();
        error.statusCode = 404;
        throw error;
      });
      const content = await github.getFileContent('package.json');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(content).toBe(null);
    });
    it('should return propagate unknown errors', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => {
        throw new Error('Something went wrong');
      });
      let err;
      try {
        await github.getFileContent('package.json');
      } catch (e) {
        err = e;
      }
      expect(err.message).toBe('Something went wrong');
    });
  });
  describe('getFileJson(filePatch, branchName)', () => {
    it('should return the file contents parsed as JSON', async () => {
      await initRepo('some/repo', 'token');
      ghGot.mockImplementationOnce(() => ({
        body: {
          content: Buffer.from('{"hello": "world"}').toString('base64'),
        },
      }));
      const content = await github.getFileJson('package.json');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(content).toMatchSnapshot();
    });
  });
  describe('commitFilesToBranch(branchName, files, message, parentBranch)', () => {
    beforeEach(async () => {
      await initRepo('some/repo', 'token');

      // getBranchCommit
      ghGot.mockImplementationOnce(() => ({
        body: {
          object: {
            sha: '1111',
          },
        },
      }));

      // getCommitTree
      ghGot.mockImplementationOnce(() => ({
        body: {
          tree: {
            sha: '2222',
          },
        },
      }));

      // createBlob
      ghGot.post.mockImplementationOnce(() => ({
        body: {
          sha: '3333',
        },
      }));

      // createTree
      ghGot.post.mockImplementationOnce(() => ({
        body: {
          sha: '4444',
        },
      }));

      // createCommit
      ghGot.post.mockImplementationOnce(() => ({
        body: {
          sha: '5555',
        },
      }));
    });
    it('should add a new commit to the branch', async () => {
      // branchExists
      ghGot.mockImplementationOnce(() => ({
        statusCode: 200,
      }));
      const files = [{
        name: 'package.json',
        contents: 'hello world',
      }];
      await github.commitFilesToBranch('package.json', files, 'my commit message');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(ghGot.post.mock.calls).toMatchSnapshot();
      expect(ghGot.patch.mock.calls).toMatchSnapshot();
    });
    it('should add a commit to a new branch if the branch does not already exist', async () => {
      // branchExists
      ghGot.mockImplementationOnce(() => ({
        statusCode: 404,
      }));
      const files = [{
        name: 'package.json',
        contents: 'hello world',
      }];
      await github.commitFilesToBranch('package.json', files, 'my other commit message');
      expect(ghGot.mock.calls).toMatchSnapshot();
      expect(ghGot.post.mock.calls).toMatchSnapshot();
      expect(ghGot.patch.mock.calls).toMatchSnapshot();
    });
  });
});