const fs = require("fs");
const glob = require("glob");
const parseXml = require("@rgrove/parse-xml");
const { promisify } = require("util");

const globpromise = promisify(glob)

function doTransform(output="status"){

  this.totalTests = 0;
  this.failedTests = 0;
  this.slowestCount = 5;
  this.failedTestDetails = [];
  this.allTests = [];

  this.outputText = ""
  
  

  this.getOutput = async()=>{
    
    const files = await globpromise("**/TEST*.xml")
    for (let index = 0; index < files.length; index++) {
      var xmlDoc = parseXml.parseXml(fs.readFileSync(files[index]).toString());
      var suites = xmlDoc.children.filter((child)=>child.name=="testsuite")
      suites.forEach((suite) => {
        this.totalTests += parseInt(suite.attributes.tests);
        this.failedTests += parseInt(suite.attributes.failures);
        var tests = suite.children.filter((child)=>child.name=="testcase")
        tests.forEach((test) => {
          this.allTests.push(test)
          test.children.forEach((failure) => {
            console.log(failure)
            if (failure.name === "failure") {
              this.failedTestDetails.push(
                suite.attributes.name +
                  "/" +
                  test.attributes.name +
                  "\n\n```\n" +
                  failure.text +
                  "\n```"
              );
            }
          });
        });
      });
    }
    if (output === "text") {
      this.outputText = outputText(this);
    } else if (output === "summary") {
      this.outputText = outputSummary(this);
    } else if (output === "slowest") {
      this.outputText = outputSlowest(this, this.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);
      }
    }
    return this.outputText
  
  }
  
}


function outputText(transform) {



  const title = "### Test Failures:";
  let body = ""
  if (transform.failedTestDetails.length > 0) {
    for (let index = 0; index < transform.failedTestDetails.length; index++) {
      body += "- " + transform.failedTestDetails[index] + "\n";
    }
  } else if (transform.totalTests > 0) {
    body = "No failing tests, awesome!";
  } else {
    body = "No tests found.";
  }

  return `${title}
  
  ${body}`
}

function outputSummary(transform) {
  const title = "### Testing Summary:";
  let body = "";
  body += "- " + transform.totalTests + " Total test(s)\n";
  body += "- " + (transform.totalTests - transform.failedTests) + " Successful test(s)\n";
  body += "- " + transform.failedTests + " Failed test(s)";
  return `${title}
  
  ${body}`
}

function outputSlowest(transform, slowestCount) {
  transform.allTests.sort((a, b) => parseFloat(b.attributes.time) - parseFloat(a.attributes.time))
  let slowestTests = transform.allTests.slice(0, slowestCount);
  
  const title = `### ${slowestCount} Slowest Tests`;
  let body = "|Test name|Test duration(seconds)|\n";
  body+="|:----|:----|\n";
  slowestTests.forEach(test => {
    body+= `| ${test.attributes.name} | ${parseFloat(test.attributes.time).toFixed(2)} |\n`;
  });

  return `${title}
  
  ${body}`
}

module.exports = doTransform