add quality issue

src/modules/feature/feature-board.ts

@@ -3,6 +3,46 @@ import { FeatureStep } from '@/modules/feature/feature-steps'
 import { features } from '@/modules/feature/feature.fixture'
 import { pickRandomElement, popNElement, shuffleArray } from '@/utils'
 
+const hasQualityIssue = (
+  complexity: number,
+  tasksInParallel: number
+): boolean => {
+  let probabilityOfQualityIssue = 0
+
+  switch (complexity) {
+    case 1:
+      probabilityOfQualityIssue = 0.8
+      break
+    case 2:
+      probabilityOfQualityIssue = 0.7
+      break
+    case 3:
+      probabilityOfQualityIssue = 0.6
+      break
+
+    default:
+      probabilityOfQualityIssue = 0.5
+      break
+  }
+
+  let multiplicator = 1
+
+  switch (tasksInParallel) {
+    case 1:
+      multiplicator = 1
+    case 2:
+      multiplicator = 1.05
+    case 3:
+      multiplicator = 1.08
+    case 4:
+      multiplicator = 1.1
+    case 5:
+      multiplicator = 1.15
+  }
+
+  return Math.random() > probabilityOfQualityIssue / multiplicator
+}
+
 export const createFeatureBoard = () => {
   const boardFeatures = shuffleArray(features)
 
@@ -24,6 +64,7 @@ export const createFeatureBoard = () => {
       if (isFeatureLive) {
         return
       }
+
       feature.leadTime++
 
       switch (feature.status) {
@@ -32,7 +73,20 @@ export const createFeatureBoard = () => {
           break
         case 'done':
           feature.status = 'doing'
-          feature.step--
+
+          if (
+            hasQualityIssue(
+              feature.complexity,
+              features.filter(
+                (f) => f.status === 'doing' && f.step === feature.step
+              ).length
+            )
+          ) {
+            feature.step = Math.min(4, feature.step + 1)
+            feature.qualityIssue++
+          } else {
+            feature.step--
+          }
           break
       }
     })