feat: add dashboard component (#811)

Fixes: #808

src/app/home/dashboard/dashboard.component.ts

@@ -11,10 +11,60 @@ import { Component, OnInit } from '@angular/core';
 })
 export class DashboardComponent implements OnInit {
 
-  constructor() {  }
+  /** Array of all user activities */
+  userActivity: string[];
+  /** Array of most recent user activities */
+  recentActivities: string[];
+  /** Array of most frequent user activities */
+  frequentActivities: string[];
+
+  /**
+   * Gets user activities from local storage.
+   */
+  constructor() {
+    this.userActivity = JSON.parse(localStorage.getItem('mifosXLocation'));
+  }
 
   ngOnInit() {
+    this.recentActivities = this.getRecentActivities();
+    this.frequentActivities = this.getFrequentActivities();
+  }
+
+  /**
+   * Returns top eight recent activities.
+   */
+  getRecentActivities() {
+    const reverseActivities = this.userActivity.reverse();
+    const uniqueActivities: string[] = [];
+    reverseActivities.forEach((activity: string) => {
+      if (!uniqueActivities.includes(activity)) {
+        uniqueActivities.push(activity);
+      }
+    });
+    const topEightRecentActivities =
+      uniqueActivities
+        .filter((activity: string) => !['/', '/login', '/home', '/dashboard'].includes(activity))
+        .slice(0, 8);
+    return topEightRecentActivities;
+  }
+
+  /**
+   * Returns top eight frequent activities.
+   */
+  getFrequentActivities() {
+    const frequencyCounts: any  = {};
+    let index  = this.userActivity.length;
+    while (index) {
+      frequencyCounts[this.userActivity[--index]] = (frequencyCounts[this.userActivity[index]] || 0) + 1;
+    }
+    const frequencyCountsArray = Object.entries(frequencyCounts);
+    const topEigthFrequentActivities =
+      frequencyCountsArray
+        .sort((a: any, b: any) => b[1] - a[1])
+        .map((entry: any[]) => entry[0])
+        .filter((activity: string) => !['/', '/login', '/home', '/dashboard'].includes(activity))
+        .slice(0, 8);
+    return topEigthFrequentActivities;
   }
 
 }
-