const fs = require("fs");
const glob = require("glob");
const libxmljs = require("libxmljs2");

function doTransform(output="status"){

  let totalTests = 0;
  let failedTests = 0;
  let slowestCount = 5;
  let failedTestDetails = [];
  let allTests = [];
  
  glob("**/TEST*.xml", async function (err, files) {
    for (let index = 0; index < files.length; index++) {
      var xmlDoc = libxmljs.parseXml(fs.readFileSync(files[index]));
      var suites = xmlDoc.find("//testsuite");
      suites.forEach((suite) => {
        totalTests += parseInt(suite.attr("tests").value());
        failedTests += parseInt(suite.attr("failures").value());
        var tests = suite.find("//testcase");
        tests.forEach((test) => {
          allTests.push(test)
          test.childNodes().forEach((failure) => {
            if (failure.name() === "failure") {
              failedTestDetails.push(
                suite.attr("name").value() +
                  "/" +
                  test.attr("name").value() +
                  "\n\n```\n" +
                  failure.text() +
                  "\n```"
              );
            }
          });
        });
      });
    }
  
    if (output === "text") {
      outputText();
    } else if (output === "summary") {
      outputSummary();
    } else if (output === "slowest") {
      outputSlowest(slowestCount);
    } else {
      if (failedTests > 0) {
        console.log("Failing tests detected, so returning a non-zero exit code");
        process.exit(1);
      } else if (totalTests == 0) {
        console.log("No tests detected, so returning a non-zero exit code");
        process.exit(1);
      }
    }
  });
  
}


function outputText() {
  console.log("### Test Failures:");
  if (failedTestDetails.length > 0) {
    for (let index = 0; index < failedTestDetails.length; index++) {
      console.log("- " + failedTestDetails[index]);
    }
  } else if (totalTests > 0) {
    console.log("No failing tests, awesome!");
  } else {
    console.log("No tests found.");
  }
}

function outputSummary() {
  console.log("### Testing Summary:");
  console.log(" ");
  console.log("- " + totalTests + " Total test(s)");
  console.log("- " + (totalTests - failedTests) + " Successful test(s)");
  console.log("- " + failedTests + " Failed test(s)");
}

function outputSlowest(slowestCount) {
  allTests.sort((a, b) => parseFloat(b.attr('time').value()) - parseFloat(a.attr('time').value()))
  let slowestTests = allTests.slice(0, slowestCount);
  console.log(" ");
  console.log(`### ${slowestCount} Slowest Tests`);
  console.log("|Test name|Test duration(seconds)|");
  console.log("|:----|:----|");
  slowestTests.forEach(test => {
    console.log(`| ${test.attr('name').value()} | ${parseFloat(test.attr('time').value()).toFixed(2)} |`);
  });
}

module.exports = doTransform