using GmRelay.Bot.Domain;
using Telegram.Bot.Types.ReplyMarkups;

namespace GmRelay.Bot.Features.Sessions.CreateSession;

internal sealed record SessionBatchDto(Guid SessionId, DateTime ScheduledAt, string Status);
internal sealed record ParticipantBatchDto(Guid SessionId, string DisplayName, string? TelegramUsername);

internal static class SessionBatchRenderer
{
    public static (string Text, InlineKeyboardMarkup Markup) Render(
        string title,
        IReadOnlyList<SessionBatchDto> sessions,
        IReadOnlyList<ParticipantBatchDto> participants)
    {
        var activeSessions = sessions.OrderBy(s => s.ScheduledAt).ToList();
        
        var messageText = $"🎲 <b>Новые игры:</b> {System.Net.WebUtility.HtmlEncode(title)}\n\n" +
                          $"<b>Расписание:</b>\n\n";

        var buttons = new List<InlineKeyboardButton[]>();

        foreach (var session in activeSessions)
        {
            var sessionPlayers = participants.Where(p => p.SessionId == session.SessionId).ToList();
            
            messageText += $"📅 <b>{session.ScheduledAt.FormatMoscow()}</b>\n";
            messageText += $"👥 Игроки ({sessionPlayers.Count}):\n";
            
            if (sessionPlayers.Count > 0)
            {
                messageText += string.Join("\n", sessionPlayers.Select(p => $"  👤 {(p.TelegramUsername != null ? "@" + p.TelegramUsername : p.DisplayName)}")) + "\n";
            }
            else
            {
                messageText += "  <i>Пока никто не записался</i>\n";
            }

            if (session.Status == "Cancelled")
            {
                messageText += "❌ <i>Сессия отменена</i>\n\n";
            }
            else if (session.Status == "RecruitmentClosed") // custom state we can derive or use
            {
                messageText += "🔒 <i>Набор завершен</i>\n\n";
            }
            else
            {
                messageText += "\n";
                // Add buttons for this specific session
                var dateTitle = session.ScheduledAt.FormatMoscowShort();
                buttons.Add(new[]
                {
                    InlineKeyboardButton.WithCallbackData($"✋ На {dateTitle}", $"join_session:{session.SessionId}"),
                    InlineKeyboardButton.WithCallbackData($"❌ Отменить {dateTitle} (ГМ)", $"cancel_session:{session.SessionId}"),
                    InlineKeyboardButton.WithCallbackData($"⏰ (ГМ)", $"reschedule_session:{session.SessionId}")
                });
            }
        }

        return (messageText, new InlineKeyboardMarkup(buttons));
    }
}