325 lines
11 KiB
Dart
325 lines
11 KiB
Dart
import 'dart:ui';
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import 'package:flutter/material.dart';
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import 'dart:convert';
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import 'package:http/http.dart' as http;
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import 'dart:async';
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class ChatScreen extends StatefulWidget {
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const ChatScreen({super.key});
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@override
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State<ChatScreen> createState() => _ChatScreenState();
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}
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class ChatMessage {
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final String text;
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final bool isAssistant;
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ChatMessage({required this.text, this.isAssistant = false});
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}
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class _ChatScreenState extends State<ChatScreen> with TickerProviderStateMixin {
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final List<ChatMessage> _messages = [];
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final TextEditingController _textController = TextEditingController();
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final ScrollController _scrollController = ScrollController();
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bool _isTyping = false;
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late AnimationController _typingController;
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@override
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void initState() {
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super.initState();
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_typingController = AnimationController(
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vsync: this,
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duration: const Duration(milliseconds: 1200),
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)..repeat();
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Timer(const Duration(seconds: 2), () => _checkAvailableModels());
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}
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Future<void> _checkAvailableModels() async {
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try {
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final response = await http.get(
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Uri.parse('http://89.114.196.110:11434/api/tags'),
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).timeout(const Duration(seconds: 15));
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if (response.statusCode == 200) {
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final data = jsonDecode(response.body);
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print("Modelos ok");
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}
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} catch (e) {
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print("Erro ao listar modelos: $e");
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}
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}
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@override
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void dispose() {
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_typingController.dispose();
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_textController.dispose();
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_scrollController.dispose();
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super.dispose();
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}
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// Função para limpar o chat
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void _clearChat() {
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setState(() {
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_messages.clear();
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_isTyping = false;
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});
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}
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Future<void> _handleSubmitted(String text) async {
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// BLOQUEIO: Se já estiver a escrever (isTyping), ignora o clique
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if (text.trim().isEmpty || _isTyping) return;
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_textController.clear();
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setState(() {
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_messages.insert(0, ChatMessage(text: text));
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_isTyping = true; // Ativa o bloqueio
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});
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try {
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final url = Uri.parse('http://89.114.196.110:11434/v1/chat/completions');
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final response = await http
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.post(
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url,
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headers: {
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'Content-Type': 'application/json',
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'Accept': 'application/json',
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},
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body: jsonEncode({
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'model': 'tinyllama',
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'messages': [{'role': 'user', 'content': text}],
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'stream': false,
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}),
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)
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.timeout(const Duration(seconds: 60));
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if (response.statusCode == 200) {
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final data = jsonDecode(response.body);
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final reply = data['choices'][0]['message']['content'] ?? 'Sem resposta.';
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if (mounted) {
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setState(() {
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_isTyping = false; // Liberta o bloqueio
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_messages.insert(0, ChatMessage(text: reply, isAssistant: true));
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});
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}
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} else {
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throw Exception('Erro ${response.statusCode}');
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}
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} catch (e) {
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if (mounted) {
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setState(() {
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_isTyping = false; // Liberta o bloqueio mesmo em caso de erro
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_messages.insert(
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0,
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ChatMessage(text: "Erro: $e", isAssistant: true),
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);
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});
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}
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}
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}
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// ... (Mantenha _buildMessage, _buildAvatar, _buildTypingIndicator e _buildAnimatedDot iguais)
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Widget _buildMessage(ChatMessage message) {
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bool isAssistant = message.isAssistant;
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return Padding(
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padding: const EdgeInsets.symmetric(vertical: 12.0, horizontal: 16.0),
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child: Row(
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mainAxisAlignment: isAssistant ? MainAxisAlignment.start : MainAxisAlignment.end,
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crossAxisAlignment: CrossAxisAlignment.end,
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children: [
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if (isAssistant) _buildAvatar(Icons.auto_awesome),
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Flexible(
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child: Container(
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padding: const EdgeInsets.symmetric(horizontal: 20.0, vertical: 14.0),
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decoration: BoxDecoration(
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gradient: isAssistant
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? const LinearGradient(colors: [Color(0xFFF1F5F9), Color(0xFFE2E8F0)])
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: const LinearGradient(colors: [Color(0xFF8ad5c9), Color(0xFF57a7ed)]),
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borderRadius: BorderRadius.only(
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topLeft: const Radius.circular(20),
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topRight: const Radius.circular(20),
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bottomLeft: Radius.circular(isAssistant ? 4 : 20),
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bottomRight: Radius.circular(isAssistant ? 20 : 4),
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),
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),
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child: Text(
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message.text,
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style: TextStyle(color: isAssistant ? Colors.black87 : Colors.white),
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),
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),
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),
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if (!isAssistant) _buildAvatar(Icons.person),
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],
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),
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);
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}
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Widget _buildAvatar(IconData icon) {
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return Container(
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margin: EdgeInsets.only(left: icon == Icons.person ? 12 : 0, right: icon == Icons.auto_awesome ? 12 : 0),
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decoration: const BoxDecoration(
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shape: BoxShape.circle,
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gradient: LinearGradient(colors: [Color(0xFF8ad5c9), Color(0xFF57a7ed)]),
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),
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child: CircleAvatar(backgroundColor: Colors.transparent, radius: 16, child: Icon(icon, color: Colors.white, size: 18)),
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);
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}
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Widget _buildTypingIndicator() {
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return Padding(
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padding: const EdgeInsets.symmetric(vertical: 12.0, horizontal: 16.0),
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child: Row(
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mainAxisAlignment: MainAxisAlignment.start,
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children: [
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_buildAvatar(Icons.auto_awesome),
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Container(
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padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 12.0),
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decoration: BoxDecoration(
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color: const Color(0xFFF1F5F9),
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borderRadius: const BorderRadius.only(topLeft: Radius.circular(20), topRight: Radius.circular(20), bottomLeft: Radius.circular(4), bottomRight: Radius.circular(20)),
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),
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child: Row(
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mainAxisSize: MainAxisSize.min,
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children: [_buildAnimatedDot(0), const SizedBox(width: 4), _buildAnimatedDot(1), const SizedBox(width: 4), _buildAnimatedDot(2)],
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),
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),
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],
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),
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);
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}
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Widget _buildAnimatedDot(int index) {
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return AnimatedBuilder(
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animation: _typingController,
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builder: (context, child) {
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double value = (_typingController.value + (index * 0.15)) % 1.0;
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double intensity = 1.0 - (value - 0.5).abs() * 2;
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return Opacity(
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opacity: 0.3 + (0.7 * intensity),
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child: Transform.translate(offset: Offset(0, -3 * intensity), child: Container(width: 6, height: 6, decoration: const BoxDecoration(color: Colors.black54, shape: BoxShape.circle))),
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);
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},
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);
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}
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Widget _buildTextComposer() {
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return ClipRRect(
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child: BackdropFilter(
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filter: ImageFilter.blur(sigmaX: 10, sigmaY: 10),
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child: Container(
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padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 12.0),
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decoration: BoxDecoration(
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color: Colors.white.withOpacity(0.8),
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border: Border(top: BorderSide(color: Colors.black.withOpacity(0.05), width: 0.5)),
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),
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child: SafeArea(
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child: Row(
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children: [
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// BOTÃO APAGAR CHAT
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IconButton(
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icon: const Icon(Icons.delete_sweep_rounded, color: Colors.redAccent),
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onPressed: _isTyping ? null : _clearChat, // Desativa enquanto digita
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),
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Expanded(
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child: Container(
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decoration: BoxDecoration(
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color: const Color(0xFFF1F5F9),
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borderRadius: BorderRadius.circular(30.0),
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border: Border.all(color: Colors.black.withOpacity(0.05)),
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),
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child: TextField(
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controller: _textController,
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enabled: !_isTyping, // Bloqueia o campo de texto
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onSubmitted: _handleSubmitted,
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decoration: InputDecoration(
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hintText: _isTyping ? "Aguarde a resposta..." : "Mensagem EPVChat...",
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border: InputBorder.none,
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contentPadding: const EdgeInsets.symmetric(horizontal: 24.0, vertical: 14.0),
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),
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),
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),
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),
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const SizedBox(width: 8),
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Container(
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decoration: BoxDecoration(
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gradient: LinearGradient(
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colors: _isTyping
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? [Colors.grey, Colors.grey] // Cor de desativado
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: [const Color(0xFF8ad5c9), const Color(0xFF57a7ed)],
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begin: Alignment.topLeft,
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end: Alignment.bottomRight,
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),
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shape: BoxShape.circle,
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),
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child: IconButton(
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icon: const Icon(Icons.send_rounded, color: Colors.white),
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onPressed: _isTyping ? null : () => _handleSubmitted(_textController.text),
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),
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),
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],
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),
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),
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),
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),
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);
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}
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@override
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Widget build(BuildContext context) {
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final screenWidth = MediaQuery.of(context).size.width;
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return Scaffold(
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backgroundColor: Colors.white,
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body: Column(
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children: [
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Expanded(
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child: ListView(
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controller: _scrollController,
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reverse: true, // Mantém a lógica de mensagens novas em baixo
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children: [
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// As mensagens vêm primeiro (no reverse: true, o topo da lista é o fundo do ecrã)
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...(_isTyping ? [_buildTypingIndicator()] : []),
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..._messages.map((msg) => _buildMessage(msg)),
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// O LOGO E O SOMBREADO AGORA SÃO O ÚLTIMO ITEM DO LISTVIEW
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// Quando o utilizador sobe o chat, eles sobem junto
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Padding(
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padding: const EdgeInsets.only(bottom: 50, top: 20),
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child: Stack(
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alignment: Alignment.center,
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children: [
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// O Sombreado Verde
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Container(
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height: screenWidth * 0.8,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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gradient: RadialGradient(
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colors: [
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const Color(0xFF8ad5c9).withOpacity(0.4),
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const Color(0xFF8ad5c9).withOpacity(0.0),
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],
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),
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),
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),
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// O Logo
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Image.asset(
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'assets/logo.png',
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height: 170,
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fit: BoxFit.contain,
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),
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],
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),
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),
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],
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),
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),
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_buildTextComposer(),
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],
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),
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);
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}
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} |