import { HoppCollection, HoppRESTRequest } from "@hoppscotch/data";
import chalk from "chalk";
import { log } from "console";
import * as A from "fp-ts/Array";
import { pipe } from "fp-ts/function";
import { round } from "lodash-es";

import { CollectionRunnerParam } from "../types/collections";
import {
  CollectionQueue,
  HoppEnvs,
  ProcessRequestParams,
  RequestReport,
} from "../types/request";
import {
  PreRequestMetrics,
  RequestMetrics,
  TestMetrics,
} from "../types/response";
import { DEFAULT_DURATION_PRECISION } from "./constants";
import {
  printErrorsReport,
  printFailedTestsReport,
  printPreRequestMetrics,
  printRequestsMetrics,
  printTestsMetrics,
} from "./display";
import { exceptionColors } from "./getters";
import { getPreRequestMetrics } from "./pre-request";
import { buildJUnitReport, generateJUnitReportExport } from "./reporters/junit";
import {
  getRequestMetrics,
  preProcessRequest,
  processRequest,
} from "./request";
import { getTestMetrics } from "./test";
import { filterValidScripts } from "./scripting";

const { WARN, FAIL, INFO } = exceptionColors;

/**
 * Processes each requests within collections to prints details of subsequent requests,
 * tests and to display complete errors-report, failed-tests-report and test-metrics.
 * @param param Data of hopp-collection with hopp-requests, envs to be processed.
 * @returns List of report for each processed request.
 */

export const collectionsRunner = async (
  param: CollectionRunnerParam
): Promise<RequestReport[]> => {
  const {
    collections,
    envs,
    delay,
    iterationCount,
    iterationData,
    legacySandbox,
  } = param;

  const resolvedDelay = delay ?? 0;

  const requestsReport: RequestReport[] = [];
  const collectionQueue = getCollectionQueue(collections);

  // If iteration count is not supplied, it should be based on the size of iteration data if in scope
  const resolvedIterationCount = iterationCount ?? iterationData?.length ?? 1;

  const originalSelectedEnvs = [...envs.selected];

  for (let count = 0; count < resolvedIterationCount; count++) {
    if (resolvedIterationCount > 1) {
      log(INFO(`\nIteration: ${count + 1}/${resolvedIterationCount}`));
    }

    // Reset `envs` to the original value at the start of each iteration
    envs.selected = [...originalSelectedEnvs];

    if (iterationData) {
      // Ensure last item is picked if the iteration count exceeds size of the iteration data
      const iterationDataItem =
        iterationData[Math.min(count, iterationData.length - 1)];

      // Ensure iteration data takes priority over supplied environment variables
      envs.selected = envs.selected
        .filter(
          (envPair) =>
            !iterationDataItem.some((dataPair) => dataPair.key === envPair.key)
        )
        .concat(iterationDataItem);
    }

    for (const { collection, path } of collectionQueue) {
      await processCollection(
        collection,
        path,
        envs,
        resolvedDelay,
        requestsReport,
        legacySandbox
      );
    }
  }

  return requestsReport;
};

const processCollection = async (
  collection: HoppCollection,
  path: string,
  envs: HoppEnvs,
  delay: number,
  requestsReport: RequestReport[],
  legacySandbox?: boolean,
  ancestorPreRequestScripts: string[] = [],
  ancestorTestScripts: string[] = []
) => {
  // Accumulate scripts from root -> current collection for inheritance
  // filterValidScripts strips empty, whitespace-only, and module-prefix-only scripts
  const inheritedPreRequestScripts = filterValidScripts([
    ...ancestorPreRequestScripts,
    collection.preRequestScript,
  ]);
  const inheritedTestScripts = filterValidScripts([
    ...ancestorTestScripts,
    collection.testScript,
  ]);

  // Process each request in the collection
  for (const request of collection.requests) {
    const _request = preProcessRequest(request as HoppRESTRequest, collection);
    const requestPath = `${path}/${_request.name}`;

    const collectionVariables = collection.variables.filter(
      (variable) => variable.key && variable.key.trim() !== ""
    );

    const processRequestParams: ProcessRequestParams = {
      path: requestPath,
      request: _request,
      envs,
      delay,
      legacySandbox,
      collectionVariables,
      inheritedPreRequestScripts,
      inheritedTestScripts,
    };

    // Request processing initiated message.
    log(WARN(`\nRunning: ${chalk.bold(requestPath)}`));

    // Processing current request.
    const result = await processRequest(processRequestParams)();

    // Updating global & selected envs with new envs from processed-request output.
    const { global, selected } = result.envs;
    envs.global = global;
    envs.selected = selected;

    // Storing current request's report.
    const requestReport = result.report;
    requestsReport.push(requestReport);
  }

  // Process each folder in the collection
  for (const folder of collection.folders) {
    const updatedFolder: HoppCollection = { ...folder };

    if (updatedFolder.auth.authType === "inherit") {
      updatedFolder.auth = collection.auth;
    }

    if (collection.headers.length) {
      // Filter out header entries present in the parent collection under the same name
      // This ensures the folder headers take precedence over the collection headers
      const filteredHeaders = collection.headers.filter(
        (collectionHeaderEntries) => {
          return !updatedFolder.headers.some(
            (folderHeaderEntries) =>
              folderHeaderEntries.key === collectionHeaderEntries.key
          );
        }
      );
      updatedFolder.headers.push(...filteredHeaders);
    }

    // Inherit collection variables into folder, with folder variables taking precedence
    if (collection.variables.length) {
      // Filter out collection variables with same key as folder variables
      const filteredVariables = collection.variables.filter(
        (collectionVariableEntries) => {
          return !updatedFolder.variables.some(
            (folderVariableEntries) =>
              folderVariableEntries.key === collectionVariableEntries.key
          );
        }
      );

      updatedFolder.variables.push(...filteredVariables);
    }

    await processCollection(
      updatedFolder,
      `${path}/${updatedFolder.name}`,
      envs,
      delay,
      requestsReport,
      legacySandbox,
      inheritedPreRequestScripts,
      inheritedTestScripts
    );
  }
};
/**
 * Transforms collections to generate collection-stack which describes each collection's
 * path within collection & the collection itself.
 * @param collections Hopp-collection objects to be mapped to collection-stack type.
 * @returns Mapped collections to collection-stack.
 */
const getCollectionQueue = (collections: HoppCollection[]): CollectionQueue[] =>
  pipe(
    collections,
    A.map(
      (collection) => <CollectionQueue>{ collection, path: collection.name }
    )
  );

/**
 * Prints collection-runner-report using test-metrics, request-metrics and
 * pre-request-metrics data in pretty-format.
 * @param requestsReport Provides data for each request-report which includes
 * path of each request within collection-json file, failed-tests-report, errors,
 * total execution duration for requests, pre-request-scripts, test-scripts.
 * @returns True, if collection runner executed without any errors or failed test-cases.
 * False, if errors occurred or test-cases failed.
 */
export const collectionsRunnerResult = (
  requestsReport: RequestReport[],
  reporterJUnitExportPath?: string
): boolean => {
  const overallTestMetrics = <TestMetrics>{
    tests: { failed: 0, passed: 0 },
    testSuites: { failed: 0, passed: 0 },
    duration: 0,
    scripts: { failed: 0, passed: 0 },
  };
  const overallRequestMetrics = <RequestMetrics>{
    requests: { failed: 0, passed: 0 },
    duration: 0,
  };
  const overallPreRequestMetrics = <PreRequestMetrics>{
    scripts: { failed: 0, passed: 0 },
    duration: 0,
  };
  let finalResult = true;

  let totalErroredTestCases = 0;
  let totalFailedTestCases = 0;

  // Printing requests-report details of failed-tests and errors
  for (const requestReport of requestsReport) {
    const { path, tests, errors, result, duration } = requestReport;
    const requestDuration = duration.request;
    const testsDuration = duration.test;
    const preRequestDuration = duration.preRequest;

    finalResult = finalResult && result;

    printFailedTestsReport(path, tests);

    printErrorsReport(path, errors);

    if (reporterJUnitExportPath) {
      const { failedRequestTestCases, erroredRequestTestCases } =
        buildJUnitReport({
          path,
          tests,
          errors,
          duration: duration.test,
        });

      totalFailedTestCases += failedRequestTestCases;
      totalErroredTestCases += erroredRequestTestCases;
    }

    /**
     * Extracting current request report's test-metrics and updating
     * overall test-metrics.
     */
    const testMetrics = getTestMetrics(tests, testsDuration, errors);
    overallTestMetrics.duration += testMetrics.duration;
    overallTestMetrics.testSuites.failed += testMetrics.testSuites.failed;
    overallTestMetrics.testSuites.passed += testMetrics.testSuites.passed;
    overallTestMetrics.tests.failed += testMetrics.tests.failed;
    overallTestMetrics.tests.passed += testMetrics.tests.passed;
    overallTestMetrics.scripts.failed += testMetrics.scripts.failed;
    overallTestMetrics.scripts.passed += testMetrics.scripts.passed;

    /**
     * Extracting current request report's request-metrics and updating
     * overall request-metrics.
     */
    const requestMetrics = getRequestMetrics(errors, requestDuration);
    overallRequestMetrics.duration += requestMetrics.duration;
    overallRequestMetrics.requests.failed += requestMetrics.requests.failed;
    overallRequestMetrics.requests.passed += requestMetrics.requests.passed;

    /**
     * Extracting current request report's pre-request-metrics and updating
     * overall pre-request-metrics.
     */
    const preRequestMetrics = getPreRequestMetrics(errors, preRequestDuration);
    overallPreRequestMetrics.duration += preRequestMetrics.duration;
    overallPreRequestMetrics.scripts.failed += preRequestMetrics.scripts.failed;
    overallPreRequestMetrics.scripts.passed += preRequestMetrics.scripts.passed;
  }

  const testMetricsDuration = overallTestMetrics.duration;
  const requestMetricsDuration = overallRequestMetrics.duration;

  // Rounding-off overall test-metrics duration upto DEFAULT_DURATION_PRECISION.
  overallTestMetrics.duration = round(
    testMetricsDuration,
    DEFAULT_DURATION_PRECISION
  );

  // Rounding-off overall request-metrics duration upto DEFAULT_DURATION_PRECISION.
  overallRequestMetrics.duration = round(
    requestMetricsDuration,
    DEFAULT_DURATION_PRECISION
  );

  printTestsMetrics(overallTestMetrics);
  printRequestsMetrics(overallRequestMetrics);
  printPreRequestMetrics(overallPreRequestMetrics);

  if (reporterJUnitExportPath) {
    const totalTestCases =
      overallTestMetrics.tests.failed + overallTestMetrics.tests.passed;

    generateJUnitReportExport({
      totalTestCases,
      totalFailedTestCases,
      totalErroredTestCases,
      testDuration: overallTestMetrics.duration,
      reporterJUnitExportPath,
    });
  }

  return finalResult;
};

/**
 * Exiting hopp cli process with appropriate exit code depending on
 * collections-runner result.
 * If result is true, we exit the cli process with code 0.
 * Else, exit with code 1.
 * @param result Boolean defining the collections-runner result.
 */
export const collectionsRunnerExit = (result: boolean): never => {
  if (!result) {
    const EXIT_MSG = FAIL(`\nExited with code 1`);
    process.stderr.write(EXIT_MSG);
    process.exit(1);
  }
  process.exit(0);
};