using System.Text.Json.Serialization;

namespace GoodWood.Application.Games;

/// <summary>
/// Base class for game events that require UI notification (dialogs, toasts, etc.).
/// Events have a unique ID to prevent duplicate display.
/// </summary>
[JsonPolymorphic(TypeDiscriminatorPropertyName = "$type")]
[JsonDerivedType(typeof(PlayerEliminatedEvent), "PlayerEliminated")]
[JsonDerivedType(typeof(PlayerWonEvent), "PlayerWon")]
[JsonDerivedType(typeof(TeamWonEvent), "TeamWon")]
[JsonDerivedType(typeof(GameEndedEvent), "GameEnded")]
[JsonDerivedType(typeof(FoxChangedEvent), "FoxChanged")]
public abstract record GameEvent
{
    /// <summary>
    /// Unique identifier for this event instance.
    /// </summary>
    public Guid EventId { get; init; } = Guid.NewGuid();

    /// <summary>
    /// Timestamp when the event was created.
    /// </summary>
    public DateTime CreatedAt { get; init; } = DateTime.UtcNow;

    /// <summary>
    /// Game-specific message to display in the UI.
    /// </summary>
    public string? Message { get; init; }
}

/// <summary>
/// Event when a player is eliminated from the game.
/// </summary>
public record PlayerEliminatedEvent : GameEvent
{
    /// <summary>
    /// ID of the eliminated player.
    /// </summary>
    public required Guid PlayerId { get; init; }

    /// <summary>
    /// Elimination rank (1 = first eliminated, 2 = second, etc.).
    /// </summary>
    public int EliminationRank { get; init; }

    /// <summary>
    /// Number of players still active after this elimination.
    /// </summary>
    public int RemainingPlayerCount { get; init; }
}

/// <summary>
/// Event when a single player wins the game.
/// </summary>
public record PlayerWonEvent : GameEvent
{
    /// <summary>
    /// ID of the winning player.
    /// </summary>
    public required Guid PlayerId { get; init; }
}

/// <summary>
/// Event when a team wins the game.
/// </summary>
public record TeamWonEvent : GameEvent
{
    /// <summary>
    /// Name or identifier of the winning team.
    /// </summary>
    public required string TeamName { get; init; }

    /// <summary>
    /// IDs of players in the winning team.
    /// </summary>
    public required IReadOnlyList<Guid> PlayerIds { get; init; }
}

/// <summary>
/// Event when the fox role changes (fox escaped or was caught).
/// </summary>
public record FoxChangedEvent : GameEvent
{
    /// <summary>
    /// ID of the player who was fox.
    /// </summary>
    public required Guid FoxPlayerId { get; init; }

    /// <summary>
    /// True if the fox escaped, false if caught by hunters.
    /// </summary>
    public bool FoxEscaped { get; init; }

    /// <summary>
    /// ID of the next fox (null if game is over).
    /// </summary>
    public Guid? NextFoxPlayerId { get; init; }
}

/// <summary>
/// Event when the game ends (covers any end scenario).
/// </summary>
public record GameEndedEvent : GameEvent
{
    /// <summary>
    /// Optional winner ID (null for draws or no-winner scenarios).
    /// </summary>
    public Guid? WinnerId { get; init; }

    /// <summary>
    /// Optional winning team name.
    /// </summary>
    public string? WinningTeamName { get; init; }

    /// <summary>
    /// Whether the game ended in a draw.
    /// </summary>
    public bool IsDraw { get; init; }
}