603 lines
20 KiB
Dart
603 lines
20 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'package:flutter_markdown_plus/flutter_markdown_plus.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import '../../api/ai_api.dart';
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import '../../core/network/api_env.dart';
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import '../../models/ai.dart';
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import '../../providers/ai_provider.dart';
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import '../../utils/toast.dart';
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import '../../widgets/state_views.dart';
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import '../../widgets/cute_icon.dart';
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/// 助手：和 AI 对话，问账单、问笔记。
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///
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/// 既是底部 Tab，也能从首页那个输入框 push 进来 —— 所以顶部自己画了
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/// 返回箭头（canPop 时才画）。
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class AssistantPage extends ConsumerStatefulWidget {
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const AssistantPage({super.key});
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@override
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ConsumerState<AssistantPage> createState() => _AssistantPageState();
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}
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class _AssistantPageState extends ConsumerState<AssistantPage> {
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final _input = TextEditingController();
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final _scroll = ScrollController();
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/// 空状态下的引导问题 —— 让用户知道能问什么，比一句「你好」有用
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static const _suggestions = [
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'这个月花了多少钱？',
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'上个月的支出分类排行',
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'我的笔记里有哪些关于 MySQL 的？',
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];
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@override
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void initState() {
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super.initState();
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// 打开就把上一次的对话展开，而不是每次都从空白开始。
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// 放进 postFrameCallback：initState 里改 provider 状态会撞上「构建期间改状态」。
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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ref.read(assistantProvider.notifier).restoreLastSessionIfNeeded();
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});
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}
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@override
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void dispose() {
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_input.dispose();
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_scroll.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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final state = ref.watch(assistantProvider);
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_scheduleScroll();
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return Scaffold(
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body: Container(
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width: double.infinity,
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height: double.infinity,
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decoration: const BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topLeft,
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end: Alignment.bottomRight,
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colors: [Color(0xFFFFE5CC), Color(0xFFFFD4A8), Color(0xFFFFC08A)],
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),
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),
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child: SafeArea(
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child: Column(
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children: [
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_header(context),
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Expanded(child: _body(context, state)),
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if (state.error != null) _errorBar(state.error!),
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_inputBar(state),
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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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// ---------------------------------------------------------------- 顶部
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Widget _header(BuildContext context) {
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return Padding(
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padding: const EdgeInsets.fromLTRB(10, 6, 8, 6),
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child: Row(
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children: [
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if (Navigator.of(context).canPop())
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_iconButton(
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icon: Icons.arrow_back,
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tooltip: '返回',
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onTap: () => Navigator.of(context).pop(),
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),
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const Padding(
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padding: EdgeInsets.only(left: 6),
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child: Text(
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'助手',
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style: TextStyle(
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fontSize: 20,
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fontWeight: FontWeight.bold,
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color: Color(0xFF5D4037),
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),
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),
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),
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const Spacer(),
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_iconButton(
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icon: Icons.history,
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tooltip: '历史对话',
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onTap: () => _showSessions(context),
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),
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_iconButton(
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icon: Icons.add_comment_outlined,
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tooltip: '新对话',
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onTap: () => ref.read(assistantProvider.notifier).newChat(),
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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 _iconButton({
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required IconData icon,
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required String tooltip,
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required VoidCallback onTap,
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}) {
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return Tooltip(
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message: tooltip,
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child: InkWell(
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onTap: onTap,
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borderRadius: BorderRadius.circular(20),
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child: Padding(
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padding: const EdgeInsets.all(7),
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child: Icon(icon, size: 21, color: const Color(0xFF5D4037)),
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),
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),
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);
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}
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// ---------------------------------------------------------------- 主体
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Widget _body(BuildContext context, AssistantState state) {
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if (state.loadingHistory) {
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return const LoadingView(tip: '正在加载对话…');
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}
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if (state.isEmpty) {
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return _welcome(context);
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}
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final showTool = state.streaming && state.bubbles.isNotEmpty;
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return ListView.builder(
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controller: _scroll,
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physics: const AlwaysScrollableScrollPhysics(),
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padding: const EdgeInsets.fromLTRB(14, 8, 14, 12),
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itemCount: state.bubbles.length + (showTool ? 1 : 0),
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itemBuilder: (context, index) {
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if (index >= state.bubbles.length) {
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return _toolIndicator(state.activeTool);
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}
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return _bubble(context, state.bubbles[index]);
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},
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);
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}
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Widget _welcome(BuildContext context) {
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return ListView(
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padding: const EdgeInsets.fromLTRB(24, 40, 24, 0),
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children: [
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const Center(child: CuteIcon('assistant', size: 48)),
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const SizedBox(height: 14),
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const Center(
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child: Text(
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'问我点什么',
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style: TextStyle(
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fontSize: 17,
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fontWeight: FontWeight.w600,
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color: Color(0xFF5D4037),
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),
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),
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),
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const SizedBox(height: 6),
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const Center(
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child: Text(
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'我能查你的账单统计和笔记',
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style: TextStyle(fontSize: 12.5, color: Color(0xFF8D6E63)),
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),
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),
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const SizedBox(height: 26),
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for (final s in _suggestions) ...[
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_suggestionChip(s),
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const SizedBox(height: 10),
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],
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],
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);
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}
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Widget _suggestionChip(String text) {
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return GestureDetector(
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onTap: () => _send(text),
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child: Container(
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 13),
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decoration: BoxDecoration(
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color: Colors.white.withValues(alpha: 0.9),
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borderRadius: BorderRadius.circular(14),
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border: Border.all(color: const Color(0xFFE8D9C5)),
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),
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child: Row(
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children: [
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Expanded(
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child: Text(
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text,
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style: const TextStyle(fontSize: 13.5, color: Color(0xFF5D4037)),
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),
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),
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const Icon(Icons.north_east, size: 15, color: Color(0xFFBCAAA4)),
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],
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),
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),
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);
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}
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// ---------------------------------------------------------------- 气泡
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Widget _bubble(BuildContext context, ChatBubble bubble) {
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if (bubble.isUser) {
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return Align(
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alignment: Alignment.centerRight,
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child: Container(
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margin: const EdgeInsets.only(top: 10, left: 48),
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padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
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decoration: BoxDecoration(
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gradient: const LinearGradient(colors: [Color(0xFFC8956E), Color(0xFFD9A87C)]),
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borderRadius: const BorderRadius.only(
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topLeft: Radius.circular(16),
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topRight: Radius.circular(16),
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bottomLeft: Radius.circular(16),
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bottomRight: Radius.circular(4),
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),
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),
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child: SelectableText(
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bubble.content,
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style: const TextStyle(fontSize: 14.5, height: 1.5, color: Colors.white),
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),
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),
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);
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}
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return Align(
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alignment: Alignment.centerLeft,
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child: Container(
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margin: const EdgeInsets.only(top: 10, right: 24),
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padding: const EdgeInsets.fromLTRB(14, 10, 14, 10),
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: const BorderRadius.only(
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topLeft: Radius.circular(16),
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topRight: Radius.circular(16),
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bottomLeft: Radius.circular(4),
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bottomRight: Radius.circular(16),
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),
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boxShadow: [
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BoxShadow(
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color: const Color(0xFF5D4037).withValues(alpha: 0.06),
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blurRadius: 8,
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offset: const Offset(0, 2),
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),
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],
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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if (bubble.content.isEmpty)
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const _TypingDots()
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else
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MarkdownBody(
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data: bubble.content,
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selectable: true,
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styleSheet: _markdownStyle(context),
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onTapLink: (text, href, title) {
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if (href == null || href.isEmpty) return;
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Clipboard.setData(ClipboardData(text: href));
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showToast(context, '链接已复制');
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},
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imageBuilder: (uri, title, alt) => Padding(
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padding: const EdgeInsets.symmetric(vertical: 6),
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child: ClipRRect(
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borderRadius: BorderRadius.circular(8),
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child: Image.network(resolveAssetUrl(uri.toString())),
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),
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),
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),
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if (bubble.streaming && bubble.content.isNotEmpty) ...[
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const SizedBox(height: 6),
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const _TypingDots(),
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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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MarkdownStyleSheet _markdownStyle(BuildContext context) {
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final base = MarkdownStyleSheet.fromTheme(Theme.of(context));
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return base.copyWith(
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p: const TextStyle(fontSize: 14.5, height: 1.6, color: Color(0xFF3E2723)),
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h1: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold, height: 1.4, color: Color(0xFF3E2723)),
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h2: const TextStyle(fontSize: 16.5, fontWeight: FontWeight.bold, height: 1.4, color: Color(0xFF3E2723)),
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h3: const TextStyle(fontSize: 15.5, fontWeight: FontWeight.w600, height: 1.4, color: Color(0xFF3E2723)),
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listBullet: const TextStyle(fontSize: 14.5, height: 1.6, color: Color(0xFF3E2723)),
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code: const TextStyle(
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fontSize: 13,
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backgroundColor: Color(0xFFF5EFE6),
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color: Color(0xFF8D4B2A),
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),
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codeblockDecoration: BoxDecoration(
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color: const Color(0xFFF5EFE6),
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borderRadius: BorderRadius.circular(8),
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),
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blockquoteDecoration: BoxDecoration(
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color: const Color(0xFFFBF6EF),
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borderRadius: BorderRadius.circular(6),
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border: const Border(left: BorderSide(color: Color(0xFFC8956E), width: 3)),
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),
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tableBorder: TableBorder.all(color: const Color(0xFFE8D9C5)),
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tableCellsPadding: const EdgeInsets.symmetric(horizontal: 8, vertical: 5),
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);
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}
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/// 工具调用提示：「正在查账单…」
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Widget _toolIndicator(String? tool) {
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return Padding(
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padding: const EdgeInsets.only(top: 10, left: 4),
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child: Row(
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children: [
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const SizedBox(
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width: 12,
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height: 12,
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child: CircularProgressIndicator(strokeWidth: 1.6, color: Color(0xFFC8956E)),
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),
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const SizedBox(width: 8),
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Text(
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_toolLabel(tool),
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style: const TextStyle(fontSize: 12.5, color: Color(0xFF8D6E63)),
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),
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],
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),
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);
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}
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String _toolLabel(String? name) => switch (name) {
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'query_bills' => '正在查账单…',
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'query_notes' => '正在搜笔记…',
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'get_note' => '正在读笔记…',
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_ => '正在查询…',
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};
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// ---------------------------------------------------------------- 错误与输入
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Widget _errorBar(String message) {
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return Container(
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width: double.infinity,
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margin: const EdgeInsets.fromLTRB(14, 0, 14, 6),
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padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 9),
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decoration: BoxDecoration(
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color: const Color(0xFFFFEBEE),
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borderRadius: BorderRadius.circular(10),
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),
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child: Row(
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children: [
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const Icon(Icons.error_outline, size: 16, color: Color(0xFFD32F2F)),
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const SizedBox(width: 8),
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Expanded(
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child: Text(
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message,
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style: const TextStyle(fontSize: 12.5, color: Color(0xFFB71C1C)),
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),
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),
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GestureDetector(
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onTap: () => ref.read(assistantProvider.notifier).clearError(),
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child: const Icon(Icons.close, size: 15, color: Color(0xFFB71C1C)),
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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 _inputBar(AssistantState state) {
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return Container(
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padding: const EdgeInsets.fromLTRB(14, 8, 14, 10),
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child: Row(
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crossAxisAlignment: CrossAxisAlignment.end,
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children: [
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Expanded(
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child: Container(
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decoration: BoxDecoration(
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color: Colors.white,
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borderRadius: BorderRadius.circular(22),
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border: Border.all(color: const Color(0xFFE8D9C5)),
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),
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 2),
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child: TextField(
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controller: _input,
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enabled: !state.streaming,
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minLines: 1,
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maxLines: 4,
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textInputAction: TextInputAction.send,
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onSubmitted: _send,
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decoration: const InputDecoration(
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border: InputBorder.none,
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isDense: true,
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contentPadding: EdgeInsets.symmetric(vertical: 12),
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hintText: '问点什么…',
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hintStyle: TextStyle(fontSize: 14, color: Color(0xFFBCAAA4)),
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),
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style: const TextStyle(fontSize: 14.5, color: Color(0xFF5D4037)),
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),
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),
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),
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const SizedBox(width: 8),
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_sendButton(state),
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],
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),
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);
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}
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Widget _sendButton(AssistantState state) {
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final disabled = state.streaming;
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return GestureDetector(
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onTap: disabled ? null : () => _send(_input.text),
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child: Container(
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width: 42,
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height: 42,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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gradient: disabled
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? null
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: const LinearGradient(colors: [Color(0xFFC8956E), Color(0xFFF5D59E)]),
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color: disabled ? const Color(0xFFE8D9C5) : null,
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),
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child: Icon(
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disabled ? Icons.hourglass_empty : Icons.arrow_upward,
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size: 20,
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color: disabled ? const Color(0xFFBCAAA4) : const Color(0xFF5D4037),
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),
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),
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);
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}
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void _send(String text) {
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final trimmed = text.trim();
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if (trimmed.isEmpty) return;
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_input.clear();
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ref.read(assistantProvider.notifier).send(trimmed);
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}
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// ---------------------------------------------------------------- 历史会话
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Future<void> _showSessions(BuildContext context) async {
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final selected = await showModalBottomSheet<int>(
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context: context,
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backgroundColor: Colors.white,
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isScrollControlled: true,
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shape: const RoundedRectangleBorder(
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borderRadius: BorderRadius.vertical(top: Radius.circular(20)),
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),
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builder: (_) => const _SessionSheet(),
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);
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if (selected == null || !mounted) return;
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ref.read(assistantProvider.notifier).openSession(selected);
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}
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// ---------------------------------------------------------------- 滚动
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/// 只在用户本来就贴着底部时才自动滚动 —— 生成过程中用户往上翻看历史时别抢
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void _scheduleScroll() {
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted || !_scroll.hasClients) return;
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final pos = _scroll.position;
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if (pos.maxScrollExtent - pos.pixels > 140) return;
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_scroll.jumpTo(pos.maxScrollExtent);
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});
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}
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}
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/// 生成中的三个点
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class _TypingDots extends StatelessWidget {
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const _TypingDots();
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@override
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Widget build(BuildContext context) {
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return const Text(
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'●●●',
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style: TextStyle(fontSize: 7, letterSpacing: 2, color: Color(0xFFC8956E)),
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);
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}
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}
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/// 历史会话面板
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class _SessionSheet extends ConsumerWidget {
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const _SessionSheet();
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@override
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Widget build(BuildContext context, WidgetRef ref) {
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final sessionsAsync = ref.watch(chatSessionsProvider);
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return SafeArea(
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child: Padding(
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padding: const EdgeInsets.fromLTRB(16, 16, 16, 12),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Text(
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'历史对话',
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style: TextStyle(
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fontSize: 15,
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fontWeight: FontWeight.w600,
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color: Color(0xFF5D4037),
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),
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),
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const SizedBox(height: 12),
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Flexible(
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child: sessionsAsync.when(
|
||
loading: () => const LoadingView(tip: '加载中…'),
|
||
error: (e, _) => ErrorView(
|
||
message: '会话列表加载失败',
|
||
onRetry: () => ref.invalidate(chatSessionsProvider),
|
||
),
|
||
data: (sessions) {
|
||
if (sessions.isEmpty) {
|
||
return const EmptyView(title: '还没有对话', tip: '问一句就有了');
|
||
}
|
||
return ListView.builder(
|
||
shrinkWrap: true,
|
||
itemCount: sessions.length,
|
||
itemBuilder: (context, index) {
|
||
final s = sessions[index];
|
||
return ListTile(
|
||
contentPadding: const EdgeInsets.symmetric(horizontal: 4),
|
||
title: Text(
|
||
s.title,
|
||
maxLines: 1,
|
||
overflow: TextOverflow.ellipsis,
|
||
style: const TextStyle(fontSize: 14.5, color: Color(0xFF5D4037)),
|
||
),
|
||
subtitle: Text(
|
||
s.updateTime,
|
||
style: const TextStyle(fontSize: 11.5, color: Color(0xFFBCAAA4)),
|
||
),
|
||
trailing: IconButton(
|
||
tooltip: '删除',
|
||
icon: const Icon(Icons.delete_outline, size: 19),
|
||
color: const Color(0xFFBCAAA4),
|
||
onPressed: () => _confirmDelete(context, ref, s),
|
||
),
|
||
onTap: () => Navigator.pop(context, s.id),
|
||
);
|
||
},
|
||
);
|
||
},
|
||
),
|
||
),
|
||
],
|
||
),
|
||
),
|
||
);
|
||
}
|
||
|
||
Future<void> _confirmDelete(BuildContext context, WidgetRef ref, ChatSessionItem session) async {
|
||
final ok = await showDialog<bool>(
|
||
context: context,
|
||
builder: (dialogContext) => AlertDialog(
|
||
title: const Text('删除对话'),
|
||
content: Text('「${session.title}」将被删除，不能再恢复。'),
|
||
actions: [
|
||
TextButton(
|
||
onPressed: () => Navigator.pop(dialogContext, false),
|
||
child: const Text('取消'),
|
||
),
|
||
TextButton(
|
||
onPressed: () => Navigator.pop(dialogContext, true),
|
||
child: const Text('删除', style: TextStyle(color: Color(0xFFD32F2F))),
|
||
),
|
||
],
|
||
),
|
||
);
|
||
if (ok != true) return;
|
||
|
||
try {
|
||
await ref.read(aiApiProvider).deleteSession(session.id);
|
||
ref.invalidate(chatSessionsProvider);
|
||
// 删掉的正好是当前打开的会话，就退回新对话
|
||
final current = ref.read(assistantProvider).sessionId;
|
||
if (current == session.id) {
|
||
ref.read(assistantProvider.notifier).newChat();
|
||
}
|
||
} catch (e) {
|
||
if (context.mounted) showToast(context, '删除失败', error: true);
|
||
}
|
||
}
|
||
}
|