import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:fluwx/fluwx.dart';
import 'package:tobias/tobias.dart';
import 'package:url_launcher/url_launcher.dart';

import 'payment_jsapi.dart';

/// 只负责调起支付渠道；支付结果必须重新向服务端查询确认。
class PaymentLauncher {
  PaymentLauncher({Fluwx? wechat, Tobias? alipay})
      : _wechat = wechat ?? Fluwx(),
        _alipay = alipay ?? Tobias();

  final Fluwx _wechat;
  final Tobias _alipay;

  Future<void> launch(Map<String, Object?> payment) async {
    final channel = payment['channel'];
    final payType = payment['pay_type'];
    final argsText = payment['client_args'] as String? ?? '';

    // 支付宝手机网站支付返回可直接打开的收银台 URL。
    if (payType == 'wap') {
      final uri = Uri.tryParse(argsText);
      if (uri == null ||
          !await launchUrl(uri, mode: LaunchMode.externalApplication)) {
        throw StateError('无法打开支付页面');
      }
      return;
    }
    if (kIsWeb && payType == 'jsapi') {
      await invokeWechatJsapi(argsText);
      return;
    }
    if (channel == 'alipay') {
      await _alipay.pay(argsText);
      return;
    }

    final args = (jsonDecode(argsText) as Map).cast<String, dynamic>();
    final accepted = await _wechat.pay(
      which: Payment(
        appId: payment['app_id'] as String? ?? '',
        partnerId: args['partnerId'] as String,
        prepayId: args['prepayId'] as String,
        packageValue: args['package'] as String,
        nonceStr: args['nonceStr'] as String,
        timestamp: int.parse(args['timeStamp'] as String),
        sign: args['sign'] as String,
      ),
    );
    if (!accepted) throw StateError('微信未接受支付请求');
  }
}