Search array, find who used different meds on dates within 90, after 90, trialled once & a pattern(A,A,B,B)

Grouped Patients

is the number of people who have only trialled it once 90"> 90"> 90"> 90"> 90"> 90">

makeUnique(arr) {
  var flags = [],
    output = [],
    l = arr.length,
    i;
  for (i = 0; i < l; i++) {
    if (flags[arr[i].patientId]) continue;
    flags[arr[i].patientId] = true;
    output.push(arr[i].age);
  }
  this.trialledCount = output.length;
  //set the value of set method to this
  // return output.length;
}
findDays(firstDate: any, secondDate: any) {
  var oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
  var dateFirst = new Date(firstDate);
  var dateSecond = new Date(secondDate);
  var diffDays = Math.round(Math.abs((dateFirst.getTime() - dateSecond.getTime()) / (oneDay)));
  return diffDays;
}
countInvalidPurchase(): any {
  this.countInvalid++;
}
getCountInvalidPurchase(): any {
  return this.countInvalid;
}
countValidPurchase(): any {
  this.countValid++;
}
getCountValidPurchase(): any {
  return this.countValid;
}
countSwitched(): any {
  this.countSwitchedVal++;
}
getCountSwitched(): any {
  return this.countSwitchedVal;
}

    makeUnique(arr) {
      var flags = [],
        output = [],
        l = arr.length,
        i;
      for (i = 0; i < l; i++) {
        if (flags[arr[i].patientId]) continue;
        flags[arr[i].patientId] = true;
        output.push(arr[i].age);
      }
      this.trialledCount = output.length;
      //set the value of set method to this
      // return output.length;
    }
    findDays(firstDate: any, secondDate: any) {
      var oneDay = 24 * 60 * 60 * 1000; // hours*minutes*seconds*milliseconds
      var dateFirst = new Date(firstDate);
      var dateSecond = new Date(secondDate);
      var diffDays = Math.round(Math.abs((dateFirst.getTime() - dateSecond.getTime()) / (oneDay)));
      return diffDays;
    }
    countInvalidPurchase(): any {
      this.countInvalid++;
    }
    getCountInvalidPurchase(): any {
      return this.countInvalid;
    }
    countValidPurchase(): any {
      this.countValid++;
    }
    getCountValidPurchase(): any {
      return this.countValid;
    }
    countSwitched(): any {
      this.countSwitchedVal++;
    }
    getCountSwitched(): any {
      return this.countSwitchedVal;
    }

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.10/angular.min.js"></script>
<h1>Grouped Patients </h1>
<div class="tools-category" *ngFor="let patientPurchase of patientPurchases | groupBy:'patientId' | pairs; let i = index">
  <h3></h3>
  <div class="tools-by-cat">
     is the number of people who have only trialled it once
    <div *ngFor="let val of patientPurchase[1]" class="tool-item">
      <div *ngIf="(patientPurchases[i+1].patientId == val.patientId)">
        <div *ngIf="val.medication == 'B'">
          <div *ngIf="patientPurchases[i+1].medication == 'I'">
            <div *ngIf="findDays(val.purchaseDate,patientPurchases[i+1].purchaseDate) > 90">
               
            </div>
            <div *ngIf="findDays(val.purchaseDate,patientPurchases[i+1].purchaseDate) < 90">
               
            </div>
          </div>
          <div *ngIf="patientPurchases[i+1].medication == 'I'">
            <div *ngIf="findDays(val.purchaseDate,patientPurchases[i+1].purchaseDate) > 90">
               
            </div>
          </div>
          <div *ngIf="patientPurchases[i+1].medication == 'B'">
            <div *ngIf="findDays(val.purchaseDate,patientPurchases[i+1].purchaseDate) > 90">
               
            </div>
          </div>
        </div>
        <div *ngIf="val.medication == 'I'">
          <div *ngIf="patientPurchases[i+1].medication == 'B'">
            <div *ngIf="findDays(val.purchaseDate,patientPurchases[i+1].purchaseDate) > 90">
               
            </div>
            <div *ngIf="findDays(val.purchaseDate,patientPurchases[i+1].purchaseDate) < 90">
               
            </div>
            <div *ngIf="patientPurchases[i+1].medication == 'I'">
              <div *ngIf="findDays(val.purchaseDate,patientPurchases[i+1].purchaseDate) > 90">
                 
              </div>
            </div>
            <div *ngIf="patientPurchases[i+1].medication == 'B'">
              <div *ngIf="findDays(val.purchaseDate,patientPurchases[i+1].purchaseDate) > 90">
                 
              </div>
            </div>
          </div>
        </div>
      </div>
      <h2></h2>
      <p></p>
    </div>
  </div>
</div>

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