import jsonFile from "jsonfile";
import builder from "junit-report-builder";
import { Feature, Scenario, StepStatus } from "./model/cucumber";
import { Config } from "./model/config";

const nsToSecondsConversion = 1000000000;

/**
 * Converts Cucumber result json files to JUnit XML.
 *
 * @example
 * const converter = new CucumberConverter({
 *    markUndefinedAsFailed: true
 * });
 * converter.convertToJunit('path/to/cucumber.json', 'path/to/output.xml');
 *
 */
export class CucumberConverter {
  /**
   * @param config - Configuration options for the converter. Default configuration is:
   * `{ markUndefinedAsFailed: true }`.
   */
  constructor(private config: Config = { markUndefinedAsFailed: true }) {}

  /**
   * Converts Cucumber result json files to JUnit XML.
   *
   * @param inputFilePath - The input Cucumber json results file. E.g 'path/to/cucumber.json'
   * @param outputFilePath - The output JUnit XML file. E.g 'path/to/output.xml'.
   * This will overwrite any file of the same name
   *
   */
  public convertToJunit(inputFilePath: string, outputFilePath: string): void {
    const cucumberReport: Feature[] = jsonFile.readFileSync(inputFilePath);

    for (const feature of cucumberReport) {
      this.addTestSuite(feature);
    }

    builder.writeTo(outputFilePath);
  }

  private addTestSuite(feature: Feature): void {
    let suiteDuration = 0;
    const suite = builder.testSuite().name(feature.name);

    for (const scenario of feature.elements) {
      suiteDuration += this.addTestCase(scenario, suite);
    }

    suite.time(suiteDuration);
  }

  private addTestCase(scenario: Scenario, suite: any): number {
    if (scenario.type === "background") {
      return 0;
    }

    const scenarioResult = this.getScenarioResult(scenario);

    const testCase = suite
      .testCase()
      .name(scenario.name)
      .className(scenario.id)
      .time(scenarioResult.duration);

    if (scenarioResult.status === "failed") {
      testCase.failure(scenarioResult.failureMessage);
    } else if (
      scenarioResult.status === "skipped" ||
      scenarioResult.status === "undefined"
    ) {
      testCase.skipped();
    }

    return scenarioResult.duration;
  }

  private getScenarioResult(scenario: Scenario) {
    let scenarioStatus: StepStatus = "passed";
    let failureMessage = "";
    let scenarioDuration = 0;

    for (const step of scenario.steps) {
      scenarioDuration += step.result.duration
        ? step.result.duration / nsToSecondsConversion
        : 0;

      if (scenarioStatus === "failed") {
        continue;
      }

      if (step.result.status === "failed") {
        scenarioStatus = "failed";
        failureMessage = step.result.error_message!;
      } else if (
        this.config.markUndefinedAsFailed &&
        step.result.status === "undefined"
      ) {
        scenarioStatus = "failed";
        failureMessage = "One or more steps are undefined";
      } else {
        scenarioStatus = step.result.status;
      }
    }

    return {
      status: scenarioStatus,
      failureMessage: failureMessage,
      duration: scenarioDuration
    };
  }
}