310 lines
10 KiB
Dart
310 lines
10 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:shadcn_ui/shadcn_ui.dart';
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import 'package:provider/provider.dart';
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import '../../../core/theme/app_spacing.dart';
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import '../../../core/theme/app_theme_extension.dart';
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import '../../../data/models/coin.dart';
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import '../../../providers/market_provider.dart';
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import '../../../providers/asset_provider.dart';
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import '../../../data/services/trade_service.dart';
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import '../../components/neon_glow.dart';
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import 'components/coin_selector.dart';
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import 'components/price_card.dart';
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import 'components/placeholder_card.dart';
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import 'components/trade_form_card.dart';
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import 'components/trade_button.dart';
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import 'components/confirm_dialog.dart';
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/// 交易頁面
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///
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/// 設計稿 Trade 頁面，佈局結構：
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/// - 幣種選擇器卡片（Coin Selector Card）
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/// - 價格卡片（Price Card）：大號價格 + 漲跌幅徽章 + 副標題
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/// - 買入/賣出切換（Buy/Sell Toggle）
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/// - 交易表單卡片（Trade Form Card）：金額輸入 + 快捷比例 + 計算數量
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/// - CTA 買入/賣出按鈕（Buy/Sell Button）
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class TradePage extends StatefulWidget {
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final String? initialCoinCode;
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const TradePage({super.key, this.initialCoinCode});
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@override
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State<TradePage> createState() => _TradePageState();
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}
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class _TradePageState extends State<TradePage>
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with AutomaticKeepAliveClientMixin {
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int _tradeType = 0; // 0=買入, 1=賣出
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Coin? _selectedCoin;
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final _amountController = TextEditingController();
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bool _isSubmitting = false;
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@override
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bool get wantKeepAlive => true;
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@override
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void initState() {
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super.initState();
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WidgetsBinding.instance.addPostFrameCallback((_) => _loadData());
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}
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void _loadData() {
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final marketProvider = context.read<MarketProvider>();
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marketProvider.loadCoins().then((_) {
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if (widget.initialCoinCode != null && _selectedCoin == null) {
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final coins = marketProvider.allCoins;
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final coin = coins.firstWhere(
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(c) =>
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c.code.toUpperCase() == widget.initialCoinCode!.toUpperCase(),
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orElse: () =>
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coins.isNotEmpty ? coins.first : throw Exception('No coins'),
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);
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if (mounted) setState(() => _selectedCoin = coin);
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}
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});
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context.read<AssetProvider>().refreshAll(force: true);
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}
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@override
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void dispose() {
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_amountController.dispose();
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super.dispose();
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}
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/// 獲取交易賬戶中 USDT 可用餘額
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String get _availableUsdt {
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final holdings = context.read<AssetProvider>().holdings;
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final usdt = holdings.where((h) => h.coinCode == 'USDT').firstOrNull;
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return usdt?.quantity ?? '0';
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}
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/// 獲取交易賬戶中當前幣種的持倉數量
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String get _availableCoinQty {
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if (_selectedCoin == null) return '0';
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final holdings = context.read<AssetProvider>().holdings;
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final pos = holdings
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.where((h) => h.coinCode == _selectedCoin!.code)
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.firstOrNull;
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return pos?.quantity ?? '0';
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}
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/// 計算可買入/賣出的最大 USDT 金額
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String get _maxAmount {
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if (_selectedCoin == null) return '0';
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final price = _selectedCoin!.price;
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if (price <= 0) return '0';
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if (_tradeType == 0) {
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return _availableUsdt;
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} else {
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// 賣出：qty * price 截斷到2位
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final qty = double.tryParse(_availableCoinQty) ?? 0;
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return ((qty * price * 100).truncateToDouble() / 100).toStringAsFixed(2);
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}
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}
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/// 計算數量（向下截斷到4位小數，確保 price * quantity <= amount）
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String get _calculatedQuantity {
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final amount = double.tryParse(_amountController.text) ?? 0;
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final price = _selectedCoin?.price ?? 0;
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if (price <= 0 || amount <= 0) return '0';
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// 使用與後端一致的截斷邏輯：先算原始數量，截斷到4位，再回算金額確保不超
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final rawQty = amount / price;
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final truncatedQty = (rawQty * 10000).truncateToDouble() / 10000;
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// 回算：roundedPrice * truncatedQty，確保不超過 amount
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final roundedPrice = (price * 100).truncateToDouble() / 100;
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if (roundedPrice * truncatedQty > amount) {
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// 回退一個最小單位（0.0001）
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return (truncatedQty - 0.0001).toStringAsFixed(4);
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}
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return truncatedQty.toStringAsFixed(4);
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}
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@override
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Widget build(BuildContext context) {
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super.build(context);
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return Scaffold(
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backgroundColor: context.colors.background,
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body: Consumer2<MarketProvider, AssetProvider>(
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builder: (context, market, asset, _) {
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return SafeArea(
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child: SingleChildScrollView(
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padding: const EdgeInsets.fromLTRB(
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AppSpacing.md, AppSpacing.md, AppSpacing.md, AppSpacing.xl + AppSpacing.sm, // 添加頂部間距
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),
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child: Column(
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children: [
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// 幣種選擇器卡片
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CoinSelector(
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selectedCoin: _selectedCoin,
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coins: market.allCoins
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.where((c) =>
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c.code != 'USDT' &&
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c.code != 'BTC' &&
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c.code != 'ETH')
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.toList(),
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onCoinSelected: (coin) {
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setState(() {
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_selectedCoin = coin;
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_amountController.clear();
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});
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},
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),
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const SizedBox(height: AppSpacing.md),
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// 價格卡片
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if (_selectedCoin != null)
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PriceCard(coin: _selectedCoin!)
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else
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PlaceholderCard(
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message: '請先選擇交易幣種',
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),
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const SizedBox(height: AppSpacing.md),
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// 交易表單卡片（內含買入/賣出切換 + 表單）
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TradeFormCard(
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tradeType: _tradeType,
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selectedCoin: _selectedCoin,
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amountController: _amountController,
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availableUsdt: _availableUsdt,
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availableCoinQty: _availableCoinQty,
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calculatedQuantity: _calculatedQuantity,
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maxAmount: _maxAmount,
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onTradeTypeChanged: (type) => setState(() {
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_tradeType = type;
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_amountController.clear();
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}),
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onAmountChanged: () => setState(() {}),
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onFillPercent: (pct) => _fillPercent(pct),
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),
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const SizedBox(height: AppSpacing.md),
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// CTA 買入/賣出按鈕
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SizedBox(
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width: double.infinity,
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height: 48,
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child: TradeButton(
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isBuy: _tradeType == 0,
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coinCode: _selectedCoin?.code,
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enabled: _canTrade() && !_isSubmitting,
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isLoading: _isSubmitting,
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onPressed: _executeTrade,
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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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}
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bool _canTrade() {
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if (_selectedCoin == null) return false;
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final amount = double.tryParse(_amountController.text) ?? 0;
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if (amount <= 0) return false;
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// 買入時校驗不超過可用USDT
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if (_tradeType == 0) {
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final available = double.tryParse(_availableUsdt) ?? 0;
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if (amount > available) return false;
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}
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return true;
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}
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void _fillPercent(double pct) {
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final max = double.tryParse(_maxAmount) ?? 0;
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final value = max * pct;
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if (_tradeType == 0) {
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// 買入：向下截斷到2位小數
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_amountController.text =
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((value * 100).truncateToDouble() / 100).toStringAsFixed(2);
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} else {
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// 賣出：_maxAmount 已是 qty*price 的四捨五入值，直接截斷
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_amountController.text =
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((value * 100).truncateToDouble() / 100).toStringAsFixed(2);
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}
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setState(() {});
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}
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void _executeTrade() async {
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final isBuy = _tradeType == 0;
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final amount = _amountController.text;
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final quantity = _calculatedQuantity;
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final price = _selectedCoin!.price.toStringAsFixed(2);
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final coinCode = _selectedCoin!.code;
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final confirmed = await showDialog<bool>(
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context: context,
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builder: (ctx) => ConfirmDialog(
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isBuy: isBuy,
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coinCode: coinCode,
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price: price,
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quantity: quantity,
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amount: amount,
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),
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);
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if (confirmed != true) return;
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setState(() => _isSubmitting = true);
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try {
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final tradeService = context.read<TradeService>();
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final response = isBuy
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? await tradeService.buy(
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coinCode: coinCode, price: price, quantity: quantity)
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: await tradeService.sell(
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coinCode: coinCode, price: price, quantity: quantity);
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if (!mounted) return;
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if (response.success) {
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_amountController.clear();
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// 刷新資產數據
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context.read<AssetProvider>().refreshAll(force: true);
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_showResultDialog(true, '${isBuy ? '買入' : '賣出'}成功',
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'$quantity $coinCode @ $price USDT');
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} else {
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_showResultDialog(false, '交易失敗', response.message ?? '請稍後重試');
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}
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} catch (e) {
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if (mounted) {
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_showResultDialog(false, '交易失敗', e.toString());
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}
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} finally {
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if (mounted) setState(() => _isSubmitting = false);
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}
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}
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void _showResultDialog(bool success, String title, String message) {
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showShadDialog(
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context: context,
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builder: (ctx) => ShadDialog.alert(
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title: Row(
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children: [
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NeonIcon(
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icon: success ? Icons.check_circle : Icons.error,
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color: success
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? ctx.appColors.up
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: ctx.colors.error,
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size: 24,
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),
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SizedBox(width: AppSpacing.sm),
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Text(title),
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],
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),
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description: Text(message),
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actions: [
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ShadButton(
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child: const Text('確定'),
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onPressed: () => Navigator.of(ctx).pop(),
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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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