93 lines
2.6 KiB
Dart
93 lines
2.6 KiB
Dart
import 'dart:async';
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import 'package:flutter/material.dart';
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import '../data/models/coin.dart';
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import '../data/models/order_book.dart';
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import '../data/services/market_service.dart';
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import '../data/services/trade_service.dart';
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/// 交易頁狀態管理 — 輪詢價格 + 訂單簿
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class TradeProvider extends ChangeNotifier {
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final MarketService _marketService;
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// ignore: unused_field
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final TradeService _tradeService;
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TradeProvider(this._marketService, this._tradeService);
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Coin? _selectedCoin;
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OrderBookDepth _depth = const OrderBookDepth(asks: [], bids: [], spread: 0, spreadPercent: 0);
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bool _isLoadingDepth = false;
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String? _error;
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Timer? _pollTimer;
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static const _pollInterval = Duration(seconds: 5);
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Coin? get selectedCoin => _selectedCoin;
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OrderBookDepth get depth => _depth;
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bool get isLoadingDepth => _isLoadingDepth;
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String? get error => _error;
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/// 实时模拟价格（从 depth 轮询获取）
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double get currentPrice => _depth.currentPrice;
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double get change24h => _depth.change24h;
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double get high24h => _depth.high24h;
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double get low24h => _depth.low24h;
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double get volume24h => _depth.volume24h;
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/// 交易时段状态
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String get tradingStatus => _depth.tradingStatus;
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double? get targetLow => _depth.targetLow;
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double? get targetHigh => _depth.targetHigh;
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double? get targetClose => _depth.targetClose;
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bool get isTradable => tradingStatus == 'trading';
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void selectCoin(Coin coin) {
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if (_selectedCoin?.code == coin.code) return;
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_selectedCoin = coin;
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_depth = const OrderBookDepth(asks: [], bids: [], spread: 0, spreadPercent: 0);
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_error = null;
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notifyListeners();
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startPolling();
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}
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void clearSelection() {
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_selectedCoin = null;
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_depth = const OrderBookDepth(asks: [], bids: [], spread: 0, spreadPercent: 0);
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stopPolling();
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notifyListeners();
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}
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void startPolling() {
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stopPolling();
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_fetchDepth();
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_pollTimer = Timer.periodic(_pollInterval, (_) => _fetchDepth());
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}
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void stopPolling() {
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_pollTimer?.cancel();
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_pollTimer = null;
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}
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Future<void> _fetchDepth() async {
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if (_selectedCoin == null) return;
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final response = await _marketService.getDepth(_selectedCoin!.code);
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if (!response.success || response.data == null) return;
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_depth = OrderBookDepth.fromJson(response.data!);
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notifyListeners();
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}
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/// 刷新幣種價格（從 MarketProvider 的列表中找到最新價）
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void updateCoinPrice(Coin updatedCoin) {
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if (_selectedCoin?.code == updatedCoin.code) {
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_selectedCoin = updatedCoin;
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notifyListeners();
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}
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}
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@override
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void dispose() {
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stopPolling();
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super.dispose();
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}
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}
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