feat: Implement Custom System Prompt Feature

src/App.jsx

@@ -1,5 +1,6 @@
 // 📦 Imports
 import React, { useState, useRef } from 'react';
+import SettingsModal from './SettingsModal';
 import ReactFlow, {
   Background,
   Controls,
@@ -26,8 +27,20 @@ const getColor = (type) => {
   }
 };
 
+const defaultSystemPrompt = `You are an expert in cause-and-effect analysis.
+
+Given a news headline or event, break it down into a chain of consequences, like a domino effect.
+
+Each node must:
+- Be short (max 15 words)
+- Represent one specific consequence
+- Be categorized as either: 'positive', 'neutral', or 'negative'
+- Be logically linked to the prompt
+
+Return only 3 outputs: one of each type.`;
+
 // 🤖 AI Logic with Domino Effect Thinking (Updated: Using Puter AI API)
-const createAIChildren = async (text, parentId, setNodes, setEdges, stopGenerationRef) => {
+const createAIChildren = async (text, parentId, setNodes, setEdges, stopGenerationRef, systemPrompt) => {
   try {
     if (stopGenerationRef.current) return;
     const res = await axios.post(
@@ -37,17 +50,7 @@ const createAIChildren = async (text, parentId, setNodes, setEdges, stopGenerati
         messages: [
           {
             role: 'system',
-            content: `You are an expert in cause-and-effect analysis.
-
-Given a news headline or event, break it down into a chain of consequences, like a domino effect.
-
-Each node must:
-- Be short (max 15 words)
-- Represent one specific consequence
-- Be categorized as either: 'positive', 'neutral', or 'negative'
-- Be logically linked to the prompt
-
-Return only 3 outputs: one of each type.`
+            content: systemPrompt
           },
           { role: 'user', content: text }
         ]
@@ -96,7 +99,7 @@ Return only 3 outputs: one of each type.`
     // Recursively expand each child one level deep
     for (const n of newNodes) {
       if (stopGenerationRef.current) break;
-      await createAIChildren(n.data.label, n.id, setNodes, setEdges, stopGenerationRef);
+      await createAIChildren(n.data.label, n.id, setNodes, setEdges, stopGenerationRef, systemPrompt);
     }
 
   } catch (err) {
@@ -113,6 +116,10 @@ export default function App() {
   const [edges, setEdges] = useState(initialEdges);
   const [prompt, setPrompt] = useState('');
   const [loading, setLoading] = useState(false);
+  const [isSettingsOpen, setIsSettingsOpen] = useState(false);
+  const [systemPrompt, setSystemPrompt] = useState(
+    localStorage.getItem('customSystemPrompt') || defaultSystemPrompt
+  );
   const stopGenerationRef = useRef(false);
   const reactFlowWrapper = useRef(null);
 
@@ -126,6 +133,11 @@ export default function App() {
     }
   };
 
+  const handleSaveSettings = () => {
+    localStorage.setItem('customSystemPrompt', systemPrompt);
+    setIsSettingsOpen(false);
+  };
+
   const handleSubmit = async () => {
     if (!prompt.trim()) return;
     setLoading(true);
@@ -150,7 +162,7 @@ export default function App() {
     setNodes([rootNode]);
     setEdges([]);
 
-    await createAIChildren(prompt, rootId, setNodes, setEdges, stopGenerationRef);
+    await createAIChildren(prompt, rootId, setNodes, setEdges, stopGenerationRef, systemPrompt);
 
     setPrompt('');
     setLoading(false);
@@ -164,7 +176,7 @@ export default function App() {
   const onNodeClick = async (_event, node) => {
     stopGenerationRef.current = false;
     setLoading(true);
-    await createAIChildren(node.data.label, node.id, setNodes, setEdges, stopGenerationRef);
+    await createAIChildren(node.data.label, node.id, setNodes, setEdges, stopGenerationRef, systemPrompt);
     setLoading(false);
   };
 
@@ -246,9 +258,31 @@ export default function App() {
           >
             Export as PNG
           </button>
+          <button
+            onClick={() => setIsSettingsOpen(true)}
+            style={{
+              padding: '10px 20px',
+              backgroundColor: '#666',
+              color: 'white',
+              border: 'none',
+              borderRadius: '8px',
+              fontWeight: 'bold',
+              cursor: 'pointer',
+            }}
+          >
+            Settings
+          </button>
         </div>
       </div>
 
+      <SettingsModal
+        isOpen={isSettingsOpen}
+        onClose={() => setIsSettingsOpen(false)}
+        systemPrompt={systemPrompt}
+        setSystemPrompt={setSystemPrompt}
+        onSave={handleSaveSettings}
+      />
+
       {/* 🧠 ReactFlow Canvas */}
       <div style={{ flexGrow: 1 }} ref={reactFlowWrapper}>
         <ReactFlow

src/SettingsModal.jsx

@@ -0,0 +1,78 @@
+// ⚙️ SettingsModal Component
+import React from 'react';
+
+const SettingsModal = ({ isOpen, onClose, systemPrompt, setSystemPrompt, onSave }) => {
+  if (!isOpen) return null;
+
+  return (
+    <div style={{
+      position: 'fixed',
+      top: 0,
+      left: 0,
+      right: 0,
+      bottom: 0,
+      backgroundColor: 'rgba(0, 0, 0, 0.7)',
+      display: 'flex',
+      alignItems: 'center',
+      justifyContent: 'center',
+      zIndex: 1000,
+    }}>
+      <div style={{
+        backgroundColor: '#333',
+        padding: '2rem',
+        borderRadius: '8px',
+        width: '500px',
+        color: '#fff',
+      }}>
+        <h2>Custom System Prompt</h2>
+        <p style={{ fontSize: '0.9rem', color: '#ccc', marginBottom: '1rem' }}>
+          Define the AI's persona and instructions here.
+        </p>
+        <textarea
+          value={systemPrompt}
+          onChange={(e) => setSystemPrompt(e.target.value)}
+          style={{
+            width: '100%',
+            height: '200px',
+            borderRadius: '4px',
+            border: '1px solid #555',
+            backgroundColor: '#222',
+            color: '#fff',
+            padding: '10px',
+            fontSize: '1rem',
+          }}
+        />
+        <div style={{ marginTop: '1rem', display: 'flex', justifyContent: 'flex-end', gap: '0.5rem' }}>
+          <button
+            onClick={onClose}
+            style={{
+              padding: '10px 20px',
+              backgroundColor: '#555',
+              color: 'white',
+              border: 'none',
+              borderRadius: '4px',
+              cursor: 'pointer',
+            }}
+          >
+            Cancel
+          </button>
+          <button
+            onClick={onSave}
+            style={{
+              padding: '10px 20px',
+              backgroundColor: '#00bcd4',
+              color: 'white',
+              border: 'none',
+              borderRadius: '4px',
+              cursor: 'pointer',
+            }}
+          >
+            Save
+          </button>
+        </div>
+      </div>
+    </div>
+  );
+};
+
+export default SettingsModal;