using MessagePack;
using OECS;

namespace Game.CardWars;

// ────────────────────────────────────────────────────────────
// Per-effect pending choice components.
// Each is placed on the singleton entity when a card effect
// requires player input. Their presence blocks game advancement.
// ────────────────────────────────────────────────────────────

/// <summary>Mercenary: choose a combatant to give a skull.</summary>
[MessagePackObject]
public record struct PendingMercenary
{
    [Key(0)] public Entity CardEntity;
    [Key(1)] public Entity Player;
}

/// <summary>Dancer: choose up to 2 combatants for horn. Step tracks progress.</summary>
[MessagePackObject]
public record struct PendingDancer
{
    [Key(0)] public Entity CardEntity;
    [Key(1)] public Entity Player;
    [Key(2)] public int Step; // 0 = first choice, 1 = second choice
}

/// <summary>Paladin: choose a combatant or banner for horn.</summary>
[MessagePackObject]
public record struct PendingPaladin
{
    [Key(0)] public Entity CardEntity;
    [Key(1)] public Entity Player;
}

/// <summary>Nun: choose a field card to discard.</summary>
[MessagePackObject]
public record struct PendingNun
{
    [Key(0)] public Entity CardEntity;
    [Key(1)] public Entity Player;
}

/// <summary>Scout: choose an opponent player to scout.</summary>
[MessagePackObject]
public record struct PendingScout
{
    [Key(0)] public Entity CardEntity;
    [Key(1)] public Entity Player;
}

/// <summary>Pegasus: choose a field card to return to hand (or null to pass).</summary>
[MessagePackObject]
public record struct PendingPegasus
{
    [Key(0)] public Entity CardEntity;
    [Key(1)] public Entity Player;
}

/// <summary>CurseMaster: choose a horn token to turn into skull.</summary>
[MessagePackObject]
public record struct PendingCurseMaster
{
    [Key(0)] public Entity CardEntity;
    [Key(1)] public Entity Player;
}

// ────────────────────────────────────────────────────────────
// Helper to detect any pending component on the singleton.
// ────────────────────────────────────────────────────────────

public static class PendingChoice
{
    /// <summary>Returns true if any pending choice component exists on the singleton.</summary>
    public static bool Any(World world)
    {
        return world.HasSingleton<PendingMercenary>()
            || world.HasSingleton<PendingDancer>()
            || world.HasSingleton<PendingPaladin>()
            || world.HasSingleton<PendingNun>()
            || world.HasSingleton<PendingScout>()
            || world.HasSingleton<PendingPegasus>()
            || world.HasSingleton<PendingCurseMaster>();
    }
}