feat(summary): add executive summary analytics page with modular components and metrics breakdown

app/(app)/summary/page.tsx

@@ -1,6 +1,98 @@
 /**
- * Summary
+ * @file app/summary/page.tsx
+ * @description Server component rendering an advanced analytical summary page with comprehensive task metrics.
  */
-export default function Summary() {
-  return <div className="space-y-6">Summary</div>;
+
+import { auth } from "@/auth";
+import { redirect } from "next/navigation";
+import { TaskService } from "@/services/task.service";
+import { COLUMNS } from "@/types/task";
+import SummaryHeader from "./sections/SummaryHeader";
+import SummaryKpiGrid from "./sections/SummaryKpiGrid";
+
+/**
+ * Calculates comprehensive analytical metrics from the user's active task collection.
+ *
+ * @param {Array<{ task: any; user: any }>} rawTasks - The collection of raw tasks and user relations.
+ * @returns {Object} An object containing total counts, completion rates, overdue totals, and status/priority breakdowns.
+ */
+function calculateTaskAnalytics(rawTasks: Array<{ task: any; user: any }>) {
+  const totalTasks = rawTasks.length;
+
+  const statusCounts: Record<string, number> = COLUMNS.reduce(
+    (acc, col) => {
+      acc[col.id] = 0;
+      return acc;
+    },
+    {} as Record<string, number>,
+  );
+
+  const priorityCounts: Record<string, number> = {
+    high: 0,
+    medium: 0,
+    low: 0,
+  };
+
+  let completedTasks = 0;
+  let overdueTasks = 0;
+  let upcomingDueTasks = 0;
+
+  const now = new Date();
+
+  rawTasks.forEach(({ task }) => {
+    if (statusCounts[task.status] !== undefined) statusCounts[task.status]++;
+    if (priorityCounts[task.priority] !== undefined)
+      priorityCounts[task.priority]++;
+    if (task.status === "done") completedTasks++;
+
+    if (task.dueDate) {
+      const dueDate = new Date(task.dueDate);
+      if (dueDate < now && task.status !== "done") {
+        overdueTasks++;
+      } else if (dueDate >= now && task.status !== "done") {
+        upcomingDueTasks++;
+      }
+    }
+  });
+
+  const completionRate =
+    totalTasks > 0 ? Math.round((completedTasks / totalTasks) * 100) : 0;
+
+  return {
+    totalTasks,
+    completedTasks,
+    completionRate,
+    overdueTasks,
+    upcomingDueTasks,
+    statusCounts,
+    priorityCounts,
+  };
+}
+
+/**
+ * Renders the summary analytics page with authentication validation, data retrieval via TaskService,
+ * KPI metrics calculation, and structural grid layouts.
+ *
+ * @async
+ * @returns {Promise<JSX.Element>} The rendered summary page component.
+ */
+export default async function SummaryPage() {
+  const session = await auth();
+  if (!session?.user?.id) redirect("/login");
+
+  const rawTasks = await TaskService.findActiveTasksForUser(session.user.id);
+  const analytics = calculateTaskAnalytics(rawTasks);
+
+  return (
+    <div className="space-y-8 max-w-7xl mx-auto pb-12">
+      <SummaryHeader />
+
+      <SummaryKpiGrid
+        totalTasks={analytics.totalTasks}
+        completionRate={analytics.completionRate}
+        overdueTasks={analytics.overdueTasks}
+        upcomingDueTasks={analytics.upcomingDueTasks}
+      />
+    </div>
+  );
 }

app/(app)/summary/sections/SummaryHeader.tsx

@@ -0,0 +1,34 @@
+/**
+ * @file app/summary/sections/SummaryHeader.tsx
+ * @description Client component rendering the analytical page header.
+ */
+
+"use client";
+
+import { BarChart3 } from "lucide-react";
+
+/**
+ * Renders the analytical executive summary header featuring an analytics icon,
+ * workspace indicator, main title, and descriptive subtitle.
+ *
+ * @returns {JSX.Element} The rendered summary header component.
+ */
+export default function SummaryHeader() {
+  return (
+    <div className="flex flex-col sm:flex-row sm:items-center sm:justify-between gap-4">
+      <div>
+        <div className="flex items-center gap-2 text-primary font-medium text-xs uppercase tracking-wider mb-1">
+          <BarChart3 size={14} />
+          Analytics & Insights
+        </div>
+        <h1 className="text-3xl font-extrabold tracking-tight">
+          Executive Summary
+        </h1>
+        <p className="text-sm text-foreground-muted mt-1">
+          Real-time overview of your workspace productivity and workflow
+          metrics.
+        </p>
+      </div>
+    </div>
+  );
+}

app/(app)/summary/sections/SummaryKpiGrid.tsx

@@ -0,0 +1,94 @@
+/**
+ * @file app/summary/sections/SummaryKpiGrid.tsx
+ * @description Client component rendering the primary KPI metrics grid.
+ */
+
+"use client";
+
+import { Layers, CheckCircle2, AlertTriangle, Clock } from "lucide-react";
+
+/**
+ * Properties for the SummaryKpiGrid component.
+ *
+ * @interface SummaryKpiGridProps
+ * @property {number} totalTasks - The total count of active tasks.
+ * @property {number} completionRate - The calculated completion rate percentage.
+ * @property {number} overdueTasks - The number of tasks past their deadline.
+ * @property {number} upcomingDueTasks - The number of tasks with upcoming deadlines.
+ */
+interface SummaryKpiGridProps {
+  totalTasks: number;
+  completionRate: number;
+  overdueTasks: number;
+  upcomingDueTasks: number;
+}
+
+/**
+ * Renders a responsive grid of KPI cards summarizing key task metrics,
+ * including active totals, completion percentages, overdue items, and upcoming targets.
+ *
+ * @param {SummaryKpiGridProps} props - The component props.
+ * @returns {JSX.Element} The rendered summary KPI grid component.
+ */
+export default function SummaryKpiGrid({
+  totalTasks,
+  completionRate,
+  overdueTasks,
+  upcomingDueTasks,
+}: SummaryKpiGridProps) {
+  const kpiCards = [
+    {
+      title: "Active Tasks",
+      value: totalTasks,
+      icon: Layers,
+      color: "text-primary",
+      borderColor: "hover:border-primary/40",
+    },
+    {
+      title: "Completion Rate",
+      value: `${completionRate}%`,
+      icon: CheckCircle2,
+      color: "text-emerald-500",
+      borderColor: "hover:border-emerald-500/40",
+    },
+    {
+      title: "Overdue Tasks",
+      value: overdueTasks,
+      icon: AlertTriangle,
+      color: "text-destructive",
+      borderColor: "hover:border-destructive/40",
+    },
+    {
+      title: "Upcoming Target",
+      value: upcomingDueTasks,
+      icon: Clock,
+      color: "text-amber-500",
+      borderColor: "hover:border-amber-500/40",
+    },
+  ];
+
+  return (
+    <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-5">
+      {kpiCards.map(({ title, value, icon: Icon, color, borderColor }) => (
+        <div
+          key={title}
+          className={`bg-card/40 border border-border/80 backdrop-blur-xl p-4 sm:p-6 rounded-2xl shadow-sm flex flex-col justify-between relative overflow-hidden group ${borderColor} transition-all duration-300`}
+        >
+          <div
+            className={`absolute bottom-0 right-0 p-4 opacity-20 group-hover:opacity-30 transition-opacity ${color}`}
+          >
+            <Icon size={48} />
+          </div>
+          <div>
+            <span className="text-xs font-semibold uppercase tracking-wider text-foreground-muted">
+              {title}
+            </span>
+            <div className={`text-4xl font-black tracking-tight mt-2 ${color}`}>
+              {value}
+            </div>
+          </div>
+        </div>
+      ))}
+    </div>
+  );
+}