using NeonSprawl.Server.Game.Combat;

namespace NeonSprawl.Server.Tests.Game.Combat;

public sealed class PlayerCombatHealthStoreTests
{
    [Fact]
    public void TryGet_ShouldLazyInitToMaxHp_OnFirstAccess()
    {
        // Arrange
        var store = new InMemoryPlayerCombatHealthStore();
        // Act
        var ok = store.TryGet("dev-local-1", out var snapshot);
        // Assert
        Assert.True(ok);
        Assert.Equal("dev-local-1", snapshot.PlayerId);
        Assert.Equal(PlayerCombatHealthDefaults.MaxHp, snapshot.MaxHp);
        Assert.Equal(PlayerCombatHealthDefaults.MaxHp, snapshot.CurrentHp);
        Assert.False(snapshot.Defeated);
    }

    [Fact]
    public void TryApplyDamage_ShouldDecreaseHp_AndFloorAtZero()
    {
        // Arrange
        var store = new InMemoryPlayerCombatHealthStore();
        // Act
        var ok = store.TryApplyDamage("dev-local-1", 15, out var snapshot);
        // Assert
        Assert.True(ok);
        Assert.Equal(85, snapshot.CurrentHp);
        Assert.False(snapshot.Defeated);
    }

    [Fact]
    public void TryApplyDamage_ShouldMarkDefeated_WhenHpReachesZero()
    {
        // Arrange
        var store = new InMemoryPlayerCombatHealthStore();
        // Act
        var ok = store.TryApplyDamage("dev-local-1", 100, out var snapshot);
        // Assert
        Assert.True(ok);
        Assert.Equal(0, snapshot.CurrentHp);
        Assert.True(snapshot.Defeated);
    }

    [Fact]
    public void TryApplyDamage_ShouldKeepHpAtZero_WhenAlreadyDefeated()
    {
        // Arrange
        var store = new InMemoryPlayerCombatHealthStore();
        _ = store.TryApplyDamage("dev-local-1", 100, out _);
        // Act
        var ok = store.TryApplyDamage("dev-local-1", 25, out var snapshot);
        // Assert
        Assert.True(ok);
        Assert.Equal(0, snapshot.CurrentHp);
        Assert.True(snapshot.Defeated);
    }

    [Fact]
    public void TryResetToFull_ShouldRestoreMaxHp()
    {
        // Arrange
        var store = new InMemoryPlayerCombatHealthStore();
        _ = store.TryApplyDamage("dev-local-1", 40, out _);
        // Act
        var ok = store.TryResetToFull("dev-local-1", out var snapshot);
        // Assert
        Assert.True(ok);
        Assert.Equal(PlayerCombatHealthDefaults.MaxHp, snapshot.CurrentHp);
        Assert.False(snapshot.Defeated);
    }

    [Theory]
    [InlineData(null)]
    [InlineData("")]
    [InlineData("   ")]
    public void TryGet_ShouldReturnFalse_WhenPlayerIdInvalid(string? playerId)
    {
        // Arrange
        var store = new InMemoryPlayerCombatHealthStore();
        // Act
        var ok = store.TryGet(playerId, out var snapshot);
        // Assert
        Assert.False(ok);
        Assert.Equal(default, snapshot);
    }

    [Fact]
    public void TryApplyDamage_ShouldReturnFalse_WhenDamageNegative()
    {
        // Arrange
        var store = new InMemoryPlayerCombatHealthStore();
        // Act
        var ok = store.TryApplyDamage("dev-local-1", -1, out var snapshot);
        // Assert
        Assert.False(ok);
        Assert.Equal(default, snapshot);
    }

    [Fact]
    public async Task Host_ShouldResolvePlayerCombatHealthStoreFromDi_WhenStartupSucceeds()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        // Act
        var store = factory.Services.GetRequiredService<IPlayerCombatHealthStore>();
        // Assert
        Assert.NotNull(store);
        Assert.True(store.TryGet("dev-local-1", out var snapshot));
        Assert.Equal(PlayerCombatHealthDefaults.MaxHp, snapshot.CurrentHp);
    }
}