import 'package:flutter/material.dart';
import 'package:provider/provider.dart';
import 'package:result_monad/result_monad.dart';

import '../controls/image_control.dart';
import '../controls/standard_appbar.dart';
import '../globals.dart';
import '../models/direct_message_thread.dart';
import '../models/exec_error.dart';
import '../services/auth_service.dart';
import '../services/direct_message_service.dart';

class MessageThreadScreen extends StatelessWidget {
  final String parentThreadId;

  const MessageThreadScreen({
    super.key,
    required this.parentThreadId,
  });

  @override
  Widget build(BuildContext context) {
    final service = context.watch<DirectMessageService>();
    final result = service.getThreadByParentUri(parentThreadId);
    final title = result.fold(
        onSuccess: (t) => t.title.isEmpty ? 'Thread' : t.title,
        onError: (_) => 'Thread');
    return Scaffold(
      appBar: StandardAppBar.build(context, title),
      body: buildBody(result),
    );
  }

  Widget buildBody(Result<DirectMessageThread, ExecError> result) {
    return result.fold(
      onSuccess: (thread) {
        final yourId = getIt<AuthService>().currentId;
        final yourAvatarUrl = getIt<AuthService>().currentAvatarUrl;
        final participants =
            Map.fromEntries(thread.participants.map((p) => MapEntry(p.id, p)));
        return Center(
            child: ListView.separated(
                itemBuilder: (context, index) {
                  final m = thread.messages[index];
                  final textPieces = m.text.split('...\n');
                  final text =
                      textPieces.length == 1 ? textPieces[0] : textPieces[1];
                  final imageUrl = m.senderId == yourId
                      ? yourAvatarUrl
                      : participants[m.senderId]?.avatarUrl ?? '';
                  return ListTile(
                    leading: ImageControl(
                      imageUrl: imageUrl,
                      iconOverride: const Icon(Icons.person),
                      width: 32.0,
                      onTap: null,
                    ),
                    title: Text(text),
                    trailing: Text(
                        DateTime.fromMillisecondsSinceEpoch(m.createdAt * 1000)
                            .toString()),
                  );
                },
                separatorBuilder: (_, __) => const Divider(),
                itemCount: thread.messages.length));
      },
      onError: (error) => Center(
        child: Text('Error getting thread: $error'),
      ),
    );
  }
}