// Copyright 2023 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:io';

import 'package:github/github.dart';

import 'cache.dart';
import 'utils.dart';

class TeamRoster {
  TeamRoster(this.teams);

  static Future<TeamRoster> load({
    required final Directory cache,
    required final GitHub github,
    required final String orgName,
    required final DateTime cacheEpoch,
  }) async {
    final roster = <String?, Map<String, User>>{};
    final teamsData = await loadFromCache(
      cache,
      github,
      <String>['org', orgName, 'teams'],
      cacheEpoch,
      () async {
        final cacheData = StringBuffer();
        await for (final Team team in github.organizations.listTeams(orgName)) {
          verifyStringSanity(team.name!, const <String>{'\n', ' '});
          cacheData.writeln('${team.name} ${team.id!}');
        }
        return cacheData.toString().trimRight();
      },
    );
    Map<String, User> parseTeamData(final String teamData) {
      final users = <String, User>{};
      for (final line in teamData.split('\n')) {
        if (line.isNotEmpty) {
          final components = line.split(' ');
          final member = User(
            login: components[0],
            id: int.parse(components[1]),
            siteAdmin: components[2] == 'true',
            htmlUrl: components[3],
            avatarUrl: components[4],
          );
          users[member.login!] = member;
        }
      }
      return users;
    }

    for (final teamLine in teamsData.split('\n')) {
      final components = teamLine.split(' ');
      final teamName = components[0];
      final teamId = int.parse(components[1]);
      final teamData = await loadFromCache(
        cache,
        github,
        <String>['team', orgName, '$teamId'],
        cacheEpoch,
        () async {
          final cacheData = StringBuffer();
          await for (final TeamMember member
              in github.organizations.listTeamMembers(teamId)) {
            verifyStringSanity(member.login!, const <String>{'\n', ' '});
            verifyStringSanity(member.htmlUrl!, const <String>{'\n', ' '});
            verifyStringSanity(member.avatarUrl!, const <String>{'\n', ' '});
            cacheData.writeln(
              '${member.login} ${member.id!} ${member.siteAdmin} ${member.htmlUrl} ${member.avatarUrl}',
            );
          }
          return cacheData.toString().trimRight();
        },
      );
      roster[teamName] = parseTeamData(teamData);
    }
    final teamData = await loadFromCache(
      cache,
      github,
      <String>['org', orgName, 'users'],
      cacheEpoch,
      () async {
        final cacheData = StringBuffer();
        await for (final User member in github.organizations.listUsers(
          orgName,
        )) {
          verifyStringSanity(member.login!, const <String>{'\n', ' '});
          verifyStringSanity(member.htmlUrl!, const <String>{'\n', ' '});
          verifyStringSanity(member.avatarUrl!, const <String>{'\n', ' '});
          cacheData.writeln(
            '${member.login} ${member.id!} ${member.siteAdmin} ${member.htmlUrl} ${member.avatarUrl}',
          );
        }
        return cacheData.toString().trimRight();
      },
    );
    roster[null] = parseTeamData(teamData);
    return TeamRoster(roster);
  }

  final Map<String?, Map<String, User>> teams;
}