Added ability to generate a basic chart using chart.js

assets/scripts/reports.coffee

@@ -0,0 +1,76 @@
+$ ->
+  $('#reports-download').on 'click', ->
+    canvas = $('#benchmark-chart')[0]
+    a = document.createElement 'a'
+    a.href = canvas.toDataURL 'image/png'
+    a.download = 'chart.png'
+    a.click()
+
+  $('#reports-button').on 'click', (e) ->
+    benchmarkId = $('#report-benchmarks').val()
+    testIds = $('#report-tests').val()
+
+    benchmarkSearchParams = new URLSearchParams
+      benchmark_id: benchmarkId
+    benchmarkRes = await fetch("/api/v1/benchmark/details?#{benchmarkSearchParams}")
+    benchmarkData = await benchmarkRes.json()
+
+    data =
+      labels: []
+      datasets: [
+        {
+          label: 'Average Score'
+          data: []
+        }
+      ]
+
+    for testId in testIds
+      try
+        testSearchParams = new URLSearchParams
+          test_id: testId
+        testRes = await fetch("/api/v1/test/details?#{testSearchParams}")
+        testData = await testRes.json()
+
+        resultSearchParams = new URLSearchParams
+          test_id: testId
+          benchmark_id: benchmarkId
+        resultRes = await fetch("/api/v1/result/list?#{resultSearchParams}")
+        resultData = await resultRes.json()
+
+        avg_total = 0
+        min_total = 0
+        max_total = 0
+
+        for result in resultData
+          avg_total += result.average
+          min_total += result.minimum if result.minimum
+          max_total += result.maximum if result.maximum
+
+        data.labels.push(testData.title)
+        data.datasets[0].data.push(avg_total / resultData.length)
+      catch error
+        console.error 'An error occurred while fetching benchmark results.', error
+
+    ctx = $('#benchmark-chart')[0].getContext('2d')
+
+    options =
+      indexAxis: 'y'
+      plugins:
+        datalabels:
+          anchor: 'end'
+          align: 'left'
+          color: 'black'
+          font:
+            weight: 'bold'
+          formatter: (value) -> value
+      scales:
+        y:
+          beginAtZero: true
+
+    new Chart ctx,
+      type: 'bar'
+      data: data
+      options: options
+      plugins: [ChartDataLabels]
+
+    $('#reports-download').attr('disabled', false)