feat(frontend): create emotional stats page

frontend/src/components/EmotionalStats.tsx

@@ -1,3 +1,14 @@
+import {
+  BarChart,
+  Bar,
+  XAxis,
+  YAxis,
+  Tooltip,
+  CartesianGrid,
+  ResponsiveContainer,
+  Legend
+} from "recharts";
+
 import type { ContentAnalysisResponse } from "../types/ApiTypes"
 import StatsStyling from "../styles/stats_styling";
 
@@ -8,11 +19,91 @@ type EmotionalStatsProps = {
 }
 
 const EmotionalStats = ({contentData}: EmotionalStatsProps) => {
+  const rows = contentData.average_emotion_by_topic ?? [];
+  const emotionKeys = rows.length
+    ? Object.keys(rows[0]).filter((key) => key.startsWith("emotion_"))
+    : [];
+
+  const colors = ["#2563eb", "#f59e0b", "#10b981", "#ef4444", "#8b5cf6", "#14b8a6"];
+
+  const chartData = rows.map((row) => {
+    const topic = String(row.topic);
+    return {
+      ...row,
+      topicLabel: topic.length > 20 ? `${topic.slice(0, 20)}...` : topic
+    };
+  });
+
+  const strongestPerTopic = rows.map((row) => {
+    let maxKey = "";
+    let maxValue = Number.NEGATIVE_INFINITY;
+
+    emotionKeys.forEach((key) => {
+      const value = Number(row[key] ?? 0);
+      if (value > maxValue) {
+        maxValue = value;
+        maxKey = key;
+      }
+    });
+
+    return {
+      topic: String(row.topic),
+      count: Number(row.n ?? 0),
+      emotion: maxKey.replace("emotion_", "") || "unknown",
+      value: maxValue > Number.NEGATIVE_INFINITY ? maxValue : 0
+    };
+  });
+
+  if (!rows.length) {
+    return (
+      <div style={{ ...styles.container, ...styles.card, marginTop: 16 }}>
+        <h2 style={styles.sectionTitle}>Emotion by Topic</h2>
+        <p style={styles.sectionSubtitle}>No topic emotion data available.</p>
+      </div>
+    );
+  }
+
   return (
     <div style={styles.page}>
-            <p>lol</p>
+      <div style={{ ...styles.container, ...styles.card, marginTop: 16 }}>
+        <h2 style={styles.sectionTitle}>Average Emotion by Topic</h2>
+        <p style={styles.sectionSubtitle}>Mean emotion scores for each detected topic</p>
+
+        {/* <div style={{ ...styles.chartWrapper, height: 420 }}>
+          <ResponsiveContainer width="100%" height="100%">
+            <BarChart data={chartData} margin={{ top: 10, right: 20, left: 0, bottom: 70 }}>
+              <CartesianGrid strokeDasharray="3 3" />
+              <XAxis dataKey="topicLabel" angle={-22} textAnchor="end" interval={0} height={80} />
+              <YAxis domain={[0, 1]} />
+              <Tooltip />
+              <Legend />
+              {emotionKeys.map((key, index) => (
+                <Bar
+                  key={key}
+                  dataKey={key}
+                  name={key.replace("emotion_", "")}
+                  fill={colors[index % colors.length]}
+                />
+              ))}
+            </BarChart>
+          </ResponsiveContainer>
+        </div> */}
       </div>
-    )
+
+      <div style={{ ...styles.container, ...styles.grid }}>
+        {strongestPerTopic.map((topic) => (
+          <div key={topic.topic} style={{ ...styles.card, gridColumn: "span 4" }}>
+            <h3 style={{ ...styles.sectionTitle, marginBottom: 6 }}>{topic.topic}</h3>
+            <p style={styles.sectionSubtitle}>Top emotion: {topic.emotion}</p>
+            <div style={{ fontSize: 20, fontWeight: 700 }}>{topic.value.toFixed(3)}</div>
+            <div style={{ fontSize: 13, color: "#6b7280", marginTop: 6 }}>
+              Based on {topic.count} events
+            </div>
+          </div>
+        ))}
+      </div>
+    </div>
+  );
 }
 
 export default EmotionalStats;

frontend/src/types/ApiTypes.ts

@@ -10,6 +10,12 @@ type FrequencyWord = {
     count: number;
 }
 
+type AverageEmotionByTopic = {
+    topic: string;
+    n: number;
+    [emotion: string]: string | number;
+}
+
 type Vocab = {
   author: string;
   events: number;
@@ -55,6 +61,7 @@ type TimeAnalysisResponse = {
 // Content Analysis
 type ContentAnalysisResponse = {
     word_frequencies: FrequencyWord[];
+    average_emotion_by_topic: AverageEmotionByTopic[];
 }
 
 // Summary
@@ -84,6 +91,7 @@ export type {
     User,
     UserAnalysisResponse,
     FrequencyWord,
+    AverageEmotionByTopic,
     SummaryResponse,
     TimeAnalysisResponse,
     ContentAnalysisResponse,