import 'dart:convert';

import 'package:yumi/shared/business_logic/models/res/login_res.dart';

const String _chatBubbleSnapshotKey = 'yumiChatBubbleV1';

class SCChatBubbleMessageSnapshot {
  final bool hasSnapshot;
  final String imageUrl;

  const SCChatBubbleMessageSnapshot({
    required this.hasSnapshot,
    required this.imageUrl,
  });
}

String scResolveChatBubbleImageUrl(PropsResources? resource) {
  final candidates = <String?>[
    resource?.imSendCoverUrl,
    resource?.imOpenedUrl,
    resource?.imOpenedUrlTwo,
    resource?.imNotOpenedUrl,
    resource?.roomSendCoverUrl,
    resource?.roomOpenedUrl,
    resource?.roomNotOpenedUrl,
    resource?.cover,
    resource?.expand,
    resource?.sourceUrl,
  ];
  return _firstNonBlank([...candidates.where(_isSvgaResource), ...candidates]);
}

String scEncodeChatBubbleMessageSnapshot(PropsResources? resource) {
  return jsonEncode(<String, dynamic>{
    _chatBubbleSnapshotKey: scResolveChatBubbleImageUrl(resource),
  });
}

SCChatBubbleMessageSnapshot scDecodeChatBubbleMessageSnapshot(
  String? cloudCustomData,
) {
  final data = cloudCustomData?.trim() ?? '';
  if (data.isEmpty) {
    return const SCChatBubbleMessageSnapshot(hasSnapshot: false, imageUrl: '');
  }
  try {
    final decoded = jsonDecode(data);
    if (decoded is! Map || !decoded.containsKey(_chatBubbleSnapshotKey)) {
      return const SCChatBubbleMessageSnapshot(
        hasSnapshot: false,
        imageUrl: '',
      );
    }
    final imageUrl = decoded[_chatBubbleSnapshotKey];
    if (imageUrl is! String) {
      return const SCChatBubbleMessageSnapshot(
        hasSnapshot: false,
        imageUrl: '',
      );
    }
    return SCChatBubbleMessageSnapshot(
      hasSnapshot: true,
      imageUrl: imageUrl.trim(),
    );
  } catch (_) {
    return const SCChatBubbleMessageSnapshot(hasSnapshot: false, imageUrl: '');
  }
}

bool _isSvgaResource(String? resource) {
  final lower = resource?.trim().toLowerCase() ?? '';
  return lower.endsWith('.svga') || lower.contains('.svga?');
}

String _firstNonBlank(Iterable<String?> values) {
  for (final value in values) {
    final text = value?.trim();
    if (text != null && text.isNotEmpty) {
      return text;
    }
  }
  return '';
}