using NeonSprawl.Server.Game.Encounters;

namespace NeonSprawl.Server.Tests.Game.Encounters;

public sealed class EncounterProgressOperationsTests
{
    private const string PlayerId = "dev-local-1";
    private const string EncounterId = "prototype_combat_pocket";
    private const string MeleeNpc = "prototype_npc_melee";
    private const string RangedNpc = "prototype_npc_ranged";
    private const string EliteNpc = "prototype_npc_elite";

    [Fact]
    public async Task TryActivateOnFirstEngagement_ShouldStartEncounter_WhenNpcIsRequired()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        // Act
        var activated = EncounterProgressOperations.TryActivateOnFirstEngagement(
            PlayerId,
            MeleeNpc,
            registry,
            progress,
            completion);
        // Assert
        Assert.True(activated);
        Assert.True(progress.TryGetProgress(PlayerId, EncounterId, out var snapshot));
        Assert.True(snapshot.Started);
        Assert.Empty(snapshot.DefeatedNpcInstanceIds);
        Assert.False(EncounterProgressOperations.IsAllRequiredTargetsDefeated(PlayerId, EncounterId, registry, progress));
    }

    [Fact]
    public async Task TryMarkTargetDefeated_ShouldReturnFalse_WhenNotActivated()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        // Act
        var marked = EncounterProgressOperations.TryMarkTargetDefeated(
            PlayerId,
            MeleeNpc,
            registry,
            progress,
            completion);
        // Assert
        Assert.False(marked);
    }

    [Fact]
    public async Task IsAllRequiredTargetsDefeated_ShouldBecomeTrue_AfterThirdDefeatInAnyOrder()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        _ = EncounterProgressOperations.TryActivateOnFirstEngagement(PlayerId, EliteNpc, registry, progress, completion);
        // Act
        _ = EncounterProgressOperations.TryMarkTargetDefeated(PlayerId, EliteNpc, registry, progress, completion);
        _ = EncounterProgressOperations.TryMarkTargetDefeated(PlayerId, MeleeNpc, registry, progress, completion);
        var afterTwo = EncounterProgressOperations.IsAllRequiredTargetsDefeated(PlayerId, EncounterId, registry, progress);
        _ = EncounterProgressOperations.TryMarkTargetDefeated(PlayerId, RangedNpc, registry, progress, completion);
        var afterThree = EncounterProgressOperations.IsAllRequiredTargetsDefeated(PlayerId, EncounterId, registry, progress);
        // Assert
        Assert.False(afterTwo);
        Assert.True(afterThree);
    }

    [Fact]
    public async Task TryMarkTargetDefeated_ShouldBeIdempotent_WhenNpcAlreadyDefeated()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        _ = EncounterProgressOperations.TryActivateOnFirstEngagement(PlayerId, MeleeNpc, registry, progress, completion);
        _ = EncounterProgressOperations.TryMarkTargetDefeated(PlayerId, MeleeNpc, registry, progress, completion);
        // Act
        var secondMark = EncounterProgressOperations.TryMarkTargetDefeated(
            PlayerId,
            MeleeNpc,
            registry,
            progress,
            completion);
        // Assert
        Assert.True(secondMark);
        Assert.True(progress.TryGetProgress(PlayerId, EncounterId, out var snapshot));
        Assert.Single(snapshot.DefeatedNpcInstanceIds);
    }

    [Fact]
    public async Task TryMarkTargetDefeated_ShouldReturnFalse_WhenEncounterAlreadyCompleted()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        _ = EncounterProgressOperations.TryActivateOnFirstEngagement(PlayerId, MeleeNpc, registry, progress, completion);
        _ = completion.TryMarkCompleted(PlayerId, EncounterId, DateTimeOffset.UtcNow);
        // Act
        var marked = EncounterProgressOperations.TryMarkTargetDefeated(
            PlayerId,
            MeleeNpc,
            registry,
            progress,
            completion);
        // Assert
        Assert.False(marked);
    }

    [Fact]
    public async Task TryActivateOnFirstEngagement_ShouldReturnFalse_WhenEncounterAlreadyCompleted()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        _ = completion.TryMarkCompleted(PlayerId, EncounterId, DateTimeOffset.UtcNow);
        // Act
        var activated = EncounterProgressOperations.TryActivateOnFirstEngagement(
            PlayerId,
            MeleeNpc,
            registry,
            progress,
            completion);
        // Assert
        Assert.False(activated);
        Assert.False(progress.TryGetProgress(PlayerId, EncounterId, out _));
    }

    [Fact]
    public async Task TryActivateOnFirstEngagement_ShouldReturnFalse_WhenNpcNotInAnyEncounter()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        // Act
        var activated = EncounterProgressOperations.TryActivateOnFirstEngagement(
            PlayerId,
            "prototype_npc_unknown",
            registry,
            progress,
            completion);
        // Assert
        Assert.False(activated);
    }

    [Fact]
    public async Task IsAllRequiredTargetsDefeated_ShouldReturnTrue_WhenEncounterIdHasMixedCase()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        _ = EncounterProgressOperations.TryActivateOnFirstEngagement(PlayerId, MeleeNpc, registry, progress, completion);
        _ = EncounterProgressOperations.TryMarkTargetDefeated(PlayerId, MeleeNpc, registry, progress, completion);
        _ = EncounterProgressOperations.TryMarkTargetDefeated(PlayerId, RangedNpc, registry, progress, completion);
        _ = EncounterProgressOperations.TryMarkTargetDefeated(PlayerId, EliteNpc, registry, progress, completion);
        // Act
        var allDefeated = EncounterProgressOperations.IsAllRequiredTargetsDefeated(
            PlayerId,
            " Prototype_Combat_Pocket ",
            registry,
            progress);
        // Assert
        Assert.True(allDefeated);
    }

    [Fact]
    public async Task IsAllRequiredTargetsDefeated_ShouldReturnTrue_WhenDefeatedSetIsSupersetOfRequired()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var registry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var progress = factory.Services.GetRequiredService<IEncounterProgressStore>();
        _ = progress.TryActivate(PlayerId, EncounterId);
        _ = progress.TryAddDefeatedTarget(PlayerId, EncounterId, MeleeNpc);
        _ = progress.TryAddDefeatedTarget(PlayerId, EncounterId, RangedNpc);
        _ = progress.TryAddDefeatedTarget(PlayerId, EncounterId, EliteNpc);
        _ = progress.TryAddDefeatedTarget(PlayerId, EncounterId, "extra_non_required_npc");
        // Act
        var allDefeated = EncounterProgressOperations.IsAllRequiredTargetsDefeated(
            PlayerId,
            EncounterId,
            registry,
            progress);
        // Assert
        Assert.True(allDefeated);
    }

    [Fact]
    public async Task TryMarkCompleted_ShouldReturnFalseOnSecondAttempt_WhenUsingCompletionStoreDirectly()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        var completion = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        var completedAt = new DateTimeOffset(2026, 5, 31, 12, 0, 0, TimeSpan.Zero);
        // Act
        var first = completion.TryMarkCompleted(PlayerId, EncounterId, completedAt);
        var second = completion.TryMarkCompleted(PlayerId, EncounterId, completedAt);
        // Assert
        Assert.True(first);
        Assert.False(second);
    }
}