import 'package:flutter/material.dart';

import '../components/my_drawer.dart';
import '../components/user_tile.dart';
import '../constants.dart';
import '../services/auth/auth_service.dart';
import '../services/user_service.dart';
import 'chat_page.dart';

class HomePage extends StatelessWidget {
  HomePage({super.key});

  final AuthService _authService = AuthService();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Home'),
        // TODO appbar style: remove background and set elevation to 0 ?
        backgroundColor: Colors.transparent,
        foregroundColor: Colors.grey.shade800,
        elevation: 0,
      ),
      drawer: const MyDrawer(),
      body: _buildUserList(),
    );
  }

  // build a list of users except for the current logged in user
  Widget _buildUserList() {
    return StreamBuilder(
        stream: UserService.getUsersStream(),
        builder: (context, snapshot) {
          // error
          if (snapshot.hasError) {
            return Text('Error: ${snapshot.error.toString()}');
          }

          //loading
          if (snapshot.connectionState == ConnectionState.waiting) {
            return const Text('Loading..');
          }

          // return list view
          return ListView(
            children: snapshot.data!
                .map<Widget>(
                    (userData) => _buildUserListItem(userData, context))
                .toList(),
          );
        });
  }

  // build individual user list item
  Widget _buildUserListItem(
      Map<String, dynamic> userData, BuildContext context) {
    // display all users except current user
    if (userData[Constants.dbFieldUsersEmail] !=
        _authService.getCurrentUser()!.email) {
      return UserTile(
        headerText: userData[Constants.dbFieldUsersEmail],
        onTap: () {
          // tapped on a user -> go to chat page
          Navigator.push(
            context,
            MaterialPageRoute(
              builder: (context) => ChatPage(
                receiverEmail: userData[Constants.dbFieldUsersEmail],
                receiverID: userData[Constants.dbFieldUsersID],
              ),
            ),
          );
        },
      );
    } else {
      return Container();
    }
  }
}