/**
 * @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
 */

import { EmptyTree, Rule, SchematicContext, Tree, callRule } from '@angular-devkit/schematics';
import { getWorkspace as readWorkspace, updateWorkspace, writeWorkspace } from './workspace';

const TEST_WORKSPACE_CONTENT = JSON.stringify({
  version: 1,
  projects: {
    test: {
      root: '',
    },
  },
});

async function testRule(rule: Rule, tree: Tree): Promise<void> {
  await callRule(rule, tree, {} as unknown as SchematicContext).toPromise();
}

describe('readWorkspace', () => {
  it('reads a workspace using the default path value', async () => {
    const tree = new EmptyTree();
    tree.create('/angular.json', TEST_WORKSPACE_CONTENT);

    const workspace = await readWorkspace(tree);
    expect(workspace.projects.has('test')).toBeTrue();
  });

  it('reads a workspace when specifying a directory path', async () => {
    const tree = new EmptyTree();
    tree.create('/xyz/angular.json', TEST_WORKSPACE_CONTENT);

    const workspace = await readWorkspace(tree, '/xyz/');
    expect(workspace.projects.has('test')).toBeTrue();
  });

  it('reads a workspace when specifying a file path', async () => {
    const tree = new EmptyTree();
    tree.create('/xyz/angular.json', TEST_WORKSPACE_CONTENT);

    const workspace = await readWorkspace(tree, '/xyz/angular.json');
    expect(workspace.projects.has('test')).toBeTrue();
  });

  it('throws if workspace file does not exist when using the default path value', async () => {
    const tree = new EmptyTree();

    await expectAsync(readWorkspace(tree)).toBeRejectedWithError();
  });

  it('throws if workspace file does not exist when specifying a file path', async () => {
    const tree = new EmptyTree();
    tree.create('/angular.json', TEST_WORKSPACE_CONTENT);

    await expectAsync(readWorkspace(tree, 'abc.json')).toBeRejectedWithError();
  });
});

describe('writeWorkspace', () => {
  it('writes a workspace using the default path value', async () => {
    const tree = new EmptyTree();
    tree.create('/angular.json', TEST_WORKSPACE_CONTENT);
    const workspace = await readWorkspace(tree);

    workspace.extensions['x-abc'] = 1;
    await writeWorkspace(tree, workspace);
    expect(tree.readJson('/angular.json')).toEqual(jasmine.objectContaining({ 'x-abc': 1 }));
  });

  it('writes a workspace when specifying a path', async () => {
    const tree = new EmptyTree();
    tree.create('/angular.json', TEST_WORKSPACE_CONTENT);
    const workspace = await readWorkspace(tree);

    workspace.extensions['x-abc'] = 1;
    await writeWorkspace(tree, workspace, '/xyz/angular.json');
    expect(tree.readJson('/xyz/angular.json')).toEqual(jasmine.objectContaining({ 'x-abc': 1 }));
  });
});

describe('updateWorkspace', () => {
  it('updates a workspace using the default path value', async () => {
    const tree = new EmptyTree();
    tree.create('/angular.json', TEST_WORKSPACE_CONTENT);

    const rule = updateWorkspace((workspace) => {
      workspace.projects.add({
        name: 'abc',
        root: 'src',
      });
    });

    await testRule(rule, tree);

    expect(tree.read('angular.json')?.toString()).toContain('"abc"');
  });

  it('throws if workspace file does not exist', async () => {
    const tree = new EmptyTree();

    const rule = updateWorkspace((workspace) => {
      workspace.projects.add({
        name: 'abc',
        root: 'src',
      });
    });

    await expectAsync(testRule(rule, tree)).toBeRejectedWithError();
  });

  it('allows executing a returned followup rule', async () => {
    const tree = new EmptyTree();
    tree.create('/angular.json', TEST_WORKSPACE_CONTENT);

    const rule = updateWorkspace(() => {
      return (tree) => tree.create('/followup.txt', '12345');
    });

    await testRule(rule, tree);

    expect(tree.read('/followup.txt')?.toString()).toContain('12345');
  });
});