import 'dart:async';
import 'package:flutter/material.dart';
import 'package:receive_sharing_intent/receive_sharing_intent.dart';
import 'quick_share_sheet.dart';

class ShareReceiverService {
  StreamSubscription? _intentSub;

  void init(BuildContext context) {
    // 1. Listen to shared text/links while app is in memory
    _intentSub = ReceiveSharingIntent.getTextStream().listen((String value) {
      if (value.isNotEmpty) {
        _handleSharedText(context, value);
      }
    }, onError: (err) {
      debugPrint("getLinkStream error: $err");
    });

    // 2. Get the shared text/link when the app is launched from closed state
    ReceiveSharingIntent.getInitialText().then((String? value) {
      if (value != null && value.isNotEmpty) {
        _handleSharedText(context, value);
      }
    });

    // 3. Listen to shared files/images (e.g. sharing photo from Gallery)
    ReceiveSharingIntent.getImageStream().listen((List<SharedMediaFile> value) {
      if (value.isNotEmpty) {
        _handleSharedFiles(context, value);
      }
    }, onError: (err) {
      debugPrint("getImageStream error: $err");
    });

    ReceiveSharingIntent.getInitialImage().then((List<SharedMediaFile> value) {
      if (value.isNotEmpty) {
        _handleSharedFiles(context, value);
      }
    });
  }

  void _handleSharedText(BuildContext context, String rawText) {
    // Sanitize and extract URL from messy text (e.g. Instagram caption + link)
    final urlRegex = RegExp(r'https?://[^\s]+');
    final match = urlRegex.firstMatch(rawText);
    final url = match?.group(0);
    final rawCaption = rawText.replaceFirst(url ?? '', '').trim();

    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: Colors.transparent,
      builder: (ctx) => QuickShareSheet(
        url: url,
        rawCaption: rawCaption.isNotEmpty ? rawCaption : null,
      ),
    );
  }

  void _handleSharedFiles(BuildContext context, List<SharedMediaFile> files) {
    if (files.isEmpty) return;
    final firstFile = files.first;

    showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      backgroundColor: Colors.transparent,
      builder: (ctx) => QuickShareSheet(
        imagePath: firstFile.path,
      ),
    );
  }

  void dispose() {
    _intentSub?.cancel();
  }
}