import 'mocha';
import { expect } from 'chai';
import { IScriptingLanguageFactory } from '@/application/Common/ScriptingLanguage/IScriptingLanguageFactory';
import { ScriptingLanguage } from '@/domain/ScriptingLanguage';
import { EnumRangeTestRunner } from '@tests/unit/application/Common/EnumRangeTestRunner';

export class ScriptingLanguageFactoryTestRunner<T> {
  private expectedTypes = new Map<ScriptingLanguage, T>();

  public expect(language: ScriptingLanguage, resultType: T) {
    this.expectedTypes.set(language, resultType);
    return this;
  }

  public testCreateMethod(sut: IScriptingLanguageFactory<T>) {
    if (!sut) { throw new Error('missing sut'); }
    testLanguageValidation(sut);
    testExpectedInstanceTypes(sut, this.expectedTypes);
  }
}

function testExpectedInstanceTypes<T>(
  sut: IScriptingLanguageFactory<T>,
  expectedTypes: Map<ScriptingLanguage, T>,
) {
  describe('create returns expected instances', () => {
    // arrange
    for (const language of expectedTypes.keys()) {
      it(ScriptingLanguage[language], () => {
        // act
        const expected = expectedTypes.get(language);
        const result = sut.create(language);
        // assert
        expect(result).to.be.instanceOf(expected, `Actual was: ${result.constructor.name}`);
      });
    }
  });
}

function testLanguageValidation<T>(sut: IScriptingLanguageFactory<T>) {
  describe('validates language', () => {
    // arrange
    const validValue = ScriptingLanguage.batchfile;
    // act
    const act = (value: ScriptingLanguage) => sut.create(value);
    // assert
    new EnumRangeTestRunner(act)
      .testOutOfRangeThrows()
      .testAbsentValueThrows()
      .testValidValueDoesNotThrow(validValue);
  });
}