import 'dart:convert';

import 'package:flutter/foundation.dart';
import 'package:flutter_local_notifications/flutter_local_notifications.dart';

import 'push_actions.dart';

/// Routes foreground notification interactions from the single
/// flutter_local_notifications response callback. Action responses (reply /
/// mark-read) are dispatched straight to [PushActions]; a plain tap publishes
/// the target chat token via [pendingChatToken] for [App] to navigate to.
class PushTapRouter {
  PushTapRouter._();

  /// Chat token of the most recently tapped Talk notification, or null. [App]
  /// listens to this and opens the chat, then resets it to null.
  static final ValueNotifier<String?> pendingChatToken = ValueNotifier(null);

  static void handleResponse(NotificationResponse response) {
    final actionId = response.actionId;
    if (actionId == kTalkReplyActionId || actionId == kTalkMarkReadActionId) {
      // Reuse the isolate-safe action dispatch for foreground actions too.
      PushActions.handleBackgroundResponse(response);
      return;
    }
    final token = _chatTokenFrom(response.payload);
    if (token != null) pendingChatToken.value = token;
  }

  static String? _chatTokenFrom(String? payload) {
    if (payload == null || payload.isEmpty) return null;
    try {
      final map = jsonDecode(payload) as Map<String, dynamic>;
      final token = map['chatToken'];
      return token is String && token.isNotEmpty ? token : null;
    } on Object {
      return null;
    }
  }
}