// <copyright file="HeykelSavasiContextTests.cs" company="MUnique">
// Licensed under the MIT License. See LICENSE file in the project root for full license information.
// </copyright>

namespace MUnique.OpenMU.Tests.HeykelSavasi;

using MUnique.OpenMU.GameLogic.MiniGames;

/// <summary>
/// Tests for the Heykel Savasi team-balance rule.
/// </summary>
/// <remarks>
/// <see cref="HeykelSavasiContext"/> derives from <see cref="MiniGameContext"/>, whose constructor
/// creates a map and launches a background game loop via <c>Task.Run</c>. Constructing a full context
/// is impractical in a fast unit test, so the balance decision is exposed as a pure static method,
/// <see cref="HeykelSavasiContext.IsJoinAllowed"/>, and tested directly against it.
/// </remarks>
[TestFixture]
public class HeykelSavasiContextTests
{
    [Test]
    public void BalanceRule_BlocksJoinWhenDifferenceWouldExceedTwo()
    {
        // Red 0, Blue 0 -> either team may be joined.
        Assert.That(HeykelSavasiContext.IsJoinAllowed(0, 0, HeykelSavasiTeam.Red), Is.True);

        // Red already has 2, Blue has 0. Adding a 3rd to Red would make the difference 3.
        Assert.That(HeykelSavasiContext.IsJoinAllowed(2, 0, HeykelSavasiTeam.Red), Is.False, "2-0 iken Red'e katilim farki 3 yapar");
        Assert.That(HeykelSavasiContext.IsJoinAllowed(2, 0, HeykelSavasiTeam.Blue), Is.True);
    }

    [Test]
    public void BalanceRule_NoneTeamIsNeverJoinable()
    {
        Assert.That(HeykelSavasiContext.IsJoinAllowed(0, 0, HeykelSavasiTeam.None), Is.False);
    }

    /// <summary>
    /// Exercises the statue-break progress/win-detection transition used by
    /// <c>HeykelSavasiContext.HandleStatueDestroyed</c> (runtime) and
    /// <c>HeykelSavasiContext.RegisterStatueDestroyedForTest</c> (test-only wrapper around it).
    /// </summary>
    /// <remarks>
    /// Like <see cref="HeykelSavasiContext.IsJoinAllowed"/> above, the progress/winner transition is
    /// extracted into a small dependency-free type, <see cref="HeykelSavasiContext.StatueProgressState"/>,
    /// so it can be driven directly here instead of through a fully constructed
    /// <see cref="HeykelSavasiContext"/> (which needs a live game context/map initializer and starts a
    /// background game loop).
    /// </remarks>
    [Test]
    public void StatueProgress_IncrementsAndDetectsWin()
    {
        var state = new HeykelSavasiContext.StatueProgressState();

        // Red breaks Blue's 7 statues, one by one; the winner must not be set before the 7th.
        for (var i = 0; i < 7; i++)
        {
            Assert.That(state.GetWinner(), Is.EqualTo(HeykelSavasiTeam.None));
            state.RegisterDestroyed(i, HeykelSavasiTeam.Red);
        }

        Assert.That(state.GetWinner(), Is.EqualTo(HeykelSavasiTeam.Red));
        Assert.That(state.GetProgress(HeykelSavasiTeam.Red), Is.EqualTo(7));
    }

    [Test]
    public void StatueProgress_IgnoresFurtherRegistrationsAfterWinnerIsSet()
    {
        var state = new HeykelSavasiContext.StatueProgressState();

        for (var i = 0; i < 7; i++)
        {
            state.RegisterDestroyed(i, HeykelSavasiTeam.Blue);
        }

        Assert.That(state.GetWinner(), Is.EqualTo(HeykelSavasiTeam.Blue));

        // A further "destruction" for the other team must not overwrite the already-decided winner.
        state.RegisterDestroyed(0, HeykelSavasiTeam.Red);

        Assert.That(state.GetWinner(), Is.EqualTo(HeykelSavasiTeam.Blue));
        Assert.That(state.GetProgress(HeykelSavasiTeam.Red), Is.EqualTo(0));
    }
}