using SVSim.BattleNode.Protocol;
using SVSim.BattleNode.Protocol.Bodies;

namespace SVSim.BattleNode.Lifecycle;

/// <summary>
/// v1 hand-rolled scripted opponent. Static frame builders for the five lifecycle uris
/// (Matched / BattleStart / Deal / Swap response / Ready) plus a trivial opponent TurnStart
/// the dispatch pushes after the player's TurnEnd. The values are templated from the TK2
/// captures at <c>data_dumps/captures/battle-traffic_tk2_regular.ndjson</c> — anything
/// hardcoded here came from a real prod frame, with names + provenance in
/// <see cref="ScriptedProfiles"/>.
/// </summary>
public static class ScriptedLifecycle
{
    /// <summary>
    /// CardId used for all 30 entries in the dummy deck. A stable neutral card that exists in
    /// every card-master version we care about, so the client can render it without
    /// triggering a card-master-mismatch error.
    /// </summary>
    public const long DummyCardId = 100011010L;

    /// <summary>
    /// Viewer id we present as the opponent on every scripted push. Out-of-range vs. real
    /// viewer ids so it can't collide with a real account in the auth pipeline.
    /// </summary>
    public const long FakeOpponentViewerId = 999_999_999L;

    public static MsgEnvelope BuildMatched(long playerViewerId, long opponentViewerId, string battleId) =>
        EnvelopeForPush(NetworkBattleUri.Matched,
            new MatchedBody(
                SelfInfo: ScriptedProfiles.PlayerMatchedProfile with { OppoId = opponentViewerId },
                OppoInfo: ScriptedProfiles.OpponentMatchedProfile with { OppoId = playerViewerId },
                SelfDeck: BuildDummyDeck()),
            bid: battleId);

    public static MsgEnvelope BuildBattleStart(long playerViewerId) =>
        EnvelopeForPush(NetworkBattleUri.BattleStart,
            new BattleStartBody(
                TurnState: 0,    // player goes first
                BattleType: 11,  // TK2 NetworkBattleType
                SelfInfo: ScriptedProfiles.PlayerBattleStartProfile,
                OppoInfo: ScriptedProfiles.OpponentBattleStartProfile));

    public static MsgEnvelope BuildDeal() =>
        EnvelopeForPush(NetworkBattleUri.Deal,
            new DealBody(
                Self: new[] { new PosIdx(0, 1), new PosIdx(1, 2), new PosIdx(2, 3) },
                Oppo: new[] { new PosIdx(0, 1), new PosIdx(1, 2), new PosIdx(2, 3) }));

    /// <summary>
    /// Initial 3-card hand idxs from <see cref="BuildDeal"/>. Each position in this array
    /// is one card; the value is the card's deck idx.
    /// </summary>
    private static readonly long[] InitialHand = { 1, 2, 3 };

    /// <summary>
    /// Compute the player's hand after a mulligan. For every idx in <paramref name="swapIndices"/>
    /// that is currently in the hand, replace it with the next unused deck idx (starting at 4,
    /// since 1..3 were dealt). Positions of kept cards are preserved.
    /// </summary>
    public static long[] ComputeHandAfterSwap(IReadOnlyList<long> swapIndices)
    {
        var hand = (long[])InitialHand.Clone();
        var nextDeckIdx = 4L;
        for (var pos = 0; pos < hand.Length; pos++)
        {
            if (swapIndices.Contains(hand[pos]))
            {
                hand[pos] = nextDeckIdx++;
            }
        }
        return hand;
    }

    public static MsgEnvelope BuildSwapResponse(IReadOnlyList<long> hand) =>
        EnvelopeForPush(NetworkBattleUri.Swap,
            new SwapResponseBody(Self: BuildPosIdxList(hand)));

    public static MsgEnvelope BuildReady(IReadOnlyList<long> hand) =>
        EnvelopeForPush(NetworkBattleUri.Ready,
            new ReadyBody(
                Self: BuildPosIdxList(hand),
                Oppo: BuildPosIdxList(InitialHand),
                IdxChangeSeed: ScriptedProfiles.ReadyIdxChangeSeed,
                Spin: ScriptedProfiles.ReadySpin));

    /// <summary>
    /// Generic TurnStart push used to transition the client into "Opponent's turn…" state
    /// after the player's TurnEnd. v1 doesn't simulate the opponent — once this lands the
    /// client sits at the opponent-turn display indefinitely.
    /// </summary>
    public static MsgEnvelope BuildOpponentTurnStart() =>
        EnvelopeForPush(NetworkBattleUri.TurnStart,
            new OpponentTurnStartBody(Spin: ScriptedProfiles.OpponentTurnStartSpin));

    private static IReadOnlyList<PosIdx> BuildPosIdxList(IReadOnlyList<long> hand)
    {
        var list = new List<PosIdx>(hand.Count);
        for (var pos = 0; pos < hand.Count; pos++)
        {
            list.Add(new PosIdx(Pos: pos, Idx: (int)hand[pos]));
        }
        return list;
    }

    private static IReadOnlyList<DeckCardRef> BuildDummyDeck()
    {
        var deck = new List<DeckCardRef>(30);
        for (var i = 1; i <= 30; i++)
        {
            deck.Add(new DeckCardRef(Idx: i, CardId: DummyCardId));
        }
        return deck;
    }

    private static MsgEnvelope EnvelopeForPush(NetworkBattleUri uri, IMsgBody body, string? bid = null) =>
        new(uri,
            ViewerId: FakeOpponentViewerId,
            Uuid: "node-stub",
            Bid: bid,
            Try: 0,
            Cat: EmitCategory.Battle,
            PubSeq: null,
            PlaySeq: null,
            Body: body);
}