Implemented chatbot feature for open source queries using Gemini

lib/ChatBotPage.dart

@@ -0,0 +1,150 @@
+import 'package:flutter/material.dart';
+import 'package:google_generative_ai/google_generative_ai.dart';
+
+
+const apiKey = 'put-gemini-api-key';
+
+
+class ChatBotPage extends StatefulWidget {
+  const ChatBotPage({Key? key}) : super(key: key);
+
+
+  @override
+  _ChatBotPageState createState() => _ChatBotPageState();
+}
+
+
+class _ChatBotPageState extends State<ChatBotPage> {
+  final TextEditingController _controller = TextEditingController();
+  final List<Map<String, String>> _messages = [];
+  GenerativeModel? _model;
+
+
+  @override
+  void initState() {
+    super.initState();
+    _initializeModel();
+  }
+
+
+  void _initializeModel() async {
+    _model = GenerativeModel(
+      model: 'gemini-1.5-flash-latest',
+      apiKey: apiKey,
+    );
+  }
+
+
+  void _sendMessage() async {
+    if (_controller.text.isEmpty) return;
+
+
+
+
+    setState(() {
+      _messages.add({"sender": "user", "text": "${_controller.text}"});
+    });
+
+
+    final prompt = _controller.text + "don't give answer in markdown format";
+    _controller.clear();
+
+
+    if (_model != null) {
+      final content = [Content.text(prompt)];
+      final response = await _model!.generateContent(content);
+      setState(() {
+        _messages.add({"sender": "bot", "text": response.text!});
+      });
+    }
+  }
+
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('ChatBot'),
+      ),
+      body: Column(
+        children: [
+          Expanded(
+            child: ListView.builder(
+              itemCount: _messages.length,
+              itemBuilder: (context, index) {
+                final message = _messages[index];
+                final isUser = message["sender"] == "user";
+                return Align(
+                  alignment: isUser ? Alignment.centerRight : Alignment.centerLeft,
+                  child: Container(
+                    constraints: BoxConstraints(
+                      maxWidth: MediaQuery.of(context).size.width * 0.75,
+                    ),
+                    margin: const EdgeInsets.symmetric(vertical: 5.0, horizontal: 10.0),
+                    padding: const EdgeInsets.all(10.0),
+                    decoration: BoxDecoration(
+                      color: isUser ? Colors.blue[100] : Colors.grey[300],
+                      borderRadius: BorderRadius.circular(10.0),
+                    ),
+                    child: Row(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        if (!isUser) const CircleAvatar(child: Icon(Icons.android)),
+                        if (!isUser) const SizedBox(width: 5.0),
+                        Expanded(
+                          child: Column(
+                            crossAxisAlignment: CrossAxisAlignment.start,
+                            children: [
+                              Text(message["text"] ?? ''),
+                            ],
+                          ),
+                        ),
+                        if (isUser) const SizedBox(width: 5.0),
+                        if (isUser) const CircleAvatar(child: Icon(Icons.person)),
+                      ],
+                    ),
+                  ),
+                );
+              },
+            ),
+          ),
+          Padding(
+            padding: const EdgeInsets.all(8.0),
+            child: Row(
+              children: [
+                Expanded(
+                  child: TextField(
+                    controller: _controller,
+                    decoration: const InputDecoration(
+                      border: OutlineInputBorder(),
+                      labelText: 'Enter your message',
+                    ),
+                  ),
+                ),
+                IconButton(
+                  icon: const Icon(Icons.send),
+                  onPressed: _sendMessage,
+                ),
+              ],
+            ),
+          ),
+        ],
+      ),
+    );
+  }
+
+
+  @override
+  void dispose() {
+    _controller.dispose();
+    super.dispose();
+  }
+}
+
+
+void main() {
+  runApp(const MaterialApp(
+    home: ChatBotPage(),
+  ));
+}
+