using SVSim.BattleNode.Sessions;

namespace SVSim.BattleNode.Sessions.Dispatch;

/// <summary>Mutable per-session state shared across frame handlers. The mulligan barrier's
/// post-swap hands, plus (PvP-equivalency, vanilla slice) the per-side idx->cardId map used to
/// synthesize the opponent-facing <c>knownList</c>. FUTURE: a token map (cardIds mined from
/// orderList <c>add</c> ops, idx>30) + a reveal-gate set land alongside <see cref="IdxToCardId"/>.</summary>
internal sealed class BattleSessionState
{
    public BattleSessionPhase SessionPhase { get; set; } = BattleSessionPhase.AwaitingInitNetwork;
    public Dictionary<IBattleParticipant, long[]> PostSwapHands { get; } = new();

    /// <summary>Per-side idx->cardId, seeded lazily from <see cref="MatchContext.SelfDeckCardIds"/>.
    /// Deck cards only (idx 1..deckCount); tokens (idx>deckCount) are deferred.</summary>
    public Dictionary<IBattleParticipant, Dictionary<int, long>> IdxToCardId { get; } = new();

    /// <summary>The sender's idx->cardId map, seeding it from its <see cref="MatchContext"/> on first
    /// use. <c>BuildPlayerDeck</c> assigns deck idx = position+1, so entry (i+1) -> cardIds[i].</summary>
    public IReadOnlyDictionary<int, long> GetOrSeedDeckMap(IBattleParticipant side)
    {
        if (!IdxToCardId.TryGetValue(side, out var map))
        {
            map = new Dictionary<int, long>();
            var deck = side.Context.SelfDeckCardIds;
            for (var i = 0; i < deck.Count; i++) map[i + 1] = deck[i];
            IdxToCardId[side] = map;
        }
        return map;
    }
}