import "dart:convert";
import "package:flutter_riverpod/flutter_riverpod.dart";
import "package:http/http.dart";
import "package:nexus/controllers/client_state_controller.dart";
import "package:nexus/controllers/header_controller.dart";
import "package:nexus/helpers/extensions/mxc_to_https.dart";
import "package:nexus/models/open_graph_data.dart";

class UrlPreviewController extends AsyncNotifier<OpenGraphData?> {
  final String link;
  UrlPreviewController(this.link);

  @override
  Future<OpenGraphData?> build() async {
    final homeserver = ref.watch(
      ClientStateController.provider.select((value) => value?.homeserverUrl),
    );

    if (homeserver != null && !link.contains("matrix.to")) {
      {
        final response = await get(
          Uri.parse(homeserver)
              .resolve("/_matrix/client/v1/media/preview_url")
              .replace(queryParameters: {"url": link}),
          headers: await ref.watch(HeaderController.provider.future),
        );

        if (response.statusCode == 200) {
          final decodedValue = json.decode(response.body);
          if (decodedValue is! Map<String, dynamic>) return null;

          final mxc = decodedValue["og:image"];
          final image = mxc == null
              ? null
              : Uri.tryParse(mxc)?.mxcToHttps(homeserver);

          return OpenGraphData.fromJson(decodedValue).copyWith(imageUrl: image);
        }
      }
    }

    return null;
  }

  static final provider = AsyncNotifierProvider.autoDispose
      .family<UrlPreviewController, OpenGraphData?, String>(
        UrlPreviewController.new,
      );
}