using System.Globalization;
using SVSim.Database.Models.Config;

namespace SVSim.EmulatedEntrypoint.Models.Dtos.ArenaColosseum;

/// <summary>
/// Single source of truth for projecting <see cref="ColosseumSeasonConfig"/> onto the wire
/// <see cref="ColosseumLobbyInfo"/> block. Used by both <c>/arena_colosseum/{top,get_fee_info}</c>
/// AND <c>/mypage/index data.colosseum_info</c> — the home-screen tab and the lobby reads
/// must agree on the season state, so they go through one builder. When
/// <c>IsColosseumPeriod = false</c> the minimal "no event" payload is emitted; the client
/// gates every other field on that flag (<c>Wizard/ColosseumEntryInfoTask.cs:100</c>).
/// </summary>
public static class ColosseumLobbyInfoBuilder
{
    private const string WireDateFormat = "yyyy-MM-dd HH:mm:ss";

    public static ColosseumLobbyInfo Build(ColosseumSeasonConfig season)
    {
        if (!season.IsColosseumPeriod)
        {
            return new ColosseumLobbyInfo { IsColosseumPeriod = false };
        }

        return new ColosseumLobbyInfo
        {
            IsColosseumPeriod = true,
            DeckFormat = (int)season.DeckFormat,
            IsNormalTwoPick = season.IsNormalTwoPick ? "1" : "0",
            ColosseumName = season.ColosseumName,
            IsRoundPeriod = true,
            IsSpecialMode = season.IsSpecialMode,
            CardPoolName = string.IsNullOrEmpty(season.CardPoolName) ? null : season.CardPoolName,
            NowRound = 1,
            StartTime = FormatTime(season.EventStartTime),
            EndTime = FormatTime(season.EventEndTime),
            IsAllCardEnabled = season.IsAllCardEnabled ? 1 : 0,
            SalesPeriodInfo = new ColosseumSalesPeriodInfo
            {
                SalesPeriodTime = FormatTime(season.SalesPeriodEnd),
            },
            StrategyPickNum = season.StrategyPickNum > 0 ? season.StrategyPickNum : null,
        };
    }

    private static string FormatTime(DateTime t) =>
        t == default ? "" : t.ToString(WireDateFormat, CultureInfo.InvariantCulture);
}