import { File, FileChangeType, Hunk } from './DiffTypes';
import {
  getPath,
  createHunkIdentifier,
  createHunkIdentifierFromContext,
} from './diffs';

describe('tests for diff util functions', () => {
  const file = (
    type: FileChangeType,
    oldPath: string,
    newPath: string,
  ): File => {
    return {
      hunks: [],
      type: type,
      oldPath,
      newPath,
      newEndingNewLine: true,
      oldEndingNewLine: true,
    };
  };

  const add = (path: string) => {
    return file('add', '/dev/null', path);
  };

  const rm = (path: string) => {
    return file('delete', path, '/dev/null');
  };

  const modify = (path: string) => {
    return file('modify', path, path);
  };

  const createHunk = (content: string): Hunk => {
    return {
      content,
      changes: [],
    };
  };

  describe('getPath tests', () => {
    it('should pick the new path, for type add', () => {
      const file = add('/etc/passwd');
      const path = getPath(file);
      expect(path).toBe('/etc/passwd');
    });

    it('should pick the old path, for type delete', () => {
      const file = rm('/etc/passwd');
      const path = getPath(file);
      expect(path).toBe('/etc/passwd');
    });
  });

  describe('createHunkIdentifier tests', () => {
    it('should create identifier', () => {
      const file = modify('/etc/passwd');
      const hunk = createHunk('@@ -1,18 +1,15 @@');
      const identifier = createHunkIdentifier(file, hunk);
      expect(identifier).toBe('modify_/etc/passwd_@@ -1,18 +1,15 @@');
    });
  });

  describe('createHunkIdentifierFromContext tests', () => {
    it('should create identifier', () => {
      const identifier = createHunkIdentifierFromContext({
        file: rm('/etc/passwd'),
        hunk: createHunk('@@ -1,42 +1,39 @@'),
      });
      expect(identifier).toBe('delete_/etc/passwd_@@ -1,42 +1,39 @@');
    });
  });
});