using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Options;
using NeonSprawl.Server.Game.Factions;
using NeonSprawl.Server.Game.PositionState;
using Xunit;

namespace NeonSprawl.Server.Tests.Game.Factions;

public sealed class InMemoryFactionStandingStoreTests
{
    private const string PlayerId = "dev-local-1";
    private const string UnknownPlayerId = "unknown-player-xyz";
    private const string GridFactionId = "prototype_faction_grid_operators";
    private const string RustFactionId = "prototype_faction_rust_collective";

    [Fact]
    public void TryGetStanding_ShouldReturnZero_WhenRowMissing()
    {
        // Arrange
        var store = CreateStore();
        // Act
        var outcome = store.TryGetStanding(PlayerId, GridFactionId);
        // Assert
        Assert.True(outcome.Success);
        Assert.Null(outcome.ReasonCode);
        Assert.Equal(0, outcome.Standing);
    }

    [Fact]
    public void TryApplyStandingDelta_ShouldReturnFifteen_WhenFirstApplyFromZero()
    {
        // Arrange
        var store = CreateStore();
        // Act
        var outcome = store.TryApplyStandingDelta(PlayerId, GridFactionId, 15);
        // Assert
        Assert.True(outcome.Success);
        Assert.Equal(0, outcome.PreviousStanding);
        Assert.Equal(15, outcome.NewStanding);
        var readBack = store.TryGetStanding(PlayerId, GridFactionId);
        Assert.True(readBack.Success);
        Assert.Equal(15, readBack.Standing);
    }

    [Fact]
    public void TryApplyStandingDelta_ShouldClampToMax_WhenDeltaExceedsBand()
    {
        // Arrange
        var store = CreateStore();
        Assert.True(store.TryApplyStandingDelta(PlayerId, GridFactionId, 95).Success);
        // Act
        var outcome = store.TryApplyStandingDelta(PlayerId, GridFactionId, 50);
        // Assert
        Assert.True(outcome.Success);
        Assert.Equal(95, outcome.PreviousStanding);
        Assert.Equal(100, outcome.NewStanding);
        Assert.Equal(100, store.TryGetStanding(PlayerId, GridFactionId).Standing);
    }

    [Fact]
    public void TryApplyStandingDelta_ShouldClampToMin_WhenDeltaBelowBand()
    {
        // Arrange
        var store = CreateStore();
        Assert.True(store.TryApplyStandingDelta(PlayerId, GridFactionId, -95).Success);
        // Act
        var outcome = store.TryApplyStandingDelta(PlayerId, GridFactionId, -50);
        // Assert
        Assert.True(outcome.Success);
        Assert.Equal(-95, outcome.PreviousStanding);
        Assert.Equal(-100, outcome.NewStanding);
        Assert.Equal(-100, store.TryGetStanding(PlayerId, GridFactionId).Standing);
    }

    [Fact]
    public void TryGetStanding_ShouldClampRead_WhenRawStoredValueExceedsMax()
    {
        // Arrange
        var store = CreateStore();
        store.SeedRawStandingForTests(PlayerId, GridFactionId, 999);
        // Act
        var outcome = store.TryGetStanding(PlayerId, GridFactionId);
        // Assert
        Assert.True(outcome.Success);
        Assert.Null(outcome.ReasonCode);
        Assert.Equal(100, outcome.Standing);
    }

    [Fact]
    public void TryGetStanding_ShouldReturnUnknownFaction_WhenFactionIdEmpty()
    {
        // Arrange
        var store = CreateStore();
        // Act
        var read = store.TryGetStanding(PlayerId, "  ");
        var write = store.TryApplyStandingDelta(PlayerId, "", 5);
        // Assert
        Assert.False(read.Success);
        Assert.Equal(FactionStandingReasonCodes.UnknownFaction, read.ReasonCode);
        Assert.False(write.Success);
        Assert.Equal(FactionStandingReasonCodes.UnknownFaction, write.ReasonCode);
    }

    [Fact]
    public void TryGetStanding_ShouldDenyUnknownFaction_WithStructuredReason()
    {
        // Arrange
        var store = CreateStore();
        // Act
        var read = store.TryGetStanding(PlayerId, "not_a_real_faction");
        var write = store.TryApplyStandingDelta(PlayerId, "not_a_real_faction", 5);
        // Assert
        Assert.False(read.Success);
        Assert.Equal(FactionStandingReasonCodes.UnknownFaction, read.ReasonCode);
        Assert.Equal(0, read.Standing);
        Assert.False(write.Success);
        Assert.Equal(FactionStandingReasonCodes.UnknownFaction, write.ReasonCode);
        Assert.Equal(0, store.TryGetStanding(PlayerId, GridFactionId).Standing);
    }

    [Fact]
    public void TryApplyStandingDelta_ShouldDenyNonWritablePlayer()
    {
        // Arrange
        var store = CreateStore();
        // Act
        var outcome = store.TryApplyStandingDelta(UnknownPlayerId, GridFactionId, 10);
        // Assert
        Assert.False(outcome.Success);
        Assert.Equal(FactionStandingReasonCodes.PlayerNotWritable, outcome.ReasonCode);
    }

    [Fact]
    public void TryGetStanding_ShouldDenyNonWritablePlayer()
    {
        // Arrange
        var store = CreateStore();
        // Act
        var outcome = store.TryGetStanding(UnknownPlayerId, GridFactionId);
        // Assert
        Assert.False(outcome.Success);
        Assert.Equal(FactionStandingReasonCodes.PlayerNotWritable, outcome.ReasonCode);
    }

    [Fact]
    public void TryApplyStandingDelta_ShouldTrackSeparateFactionsPerPlayer()
    {
        // Arrange
        var store = CreateStore();
        // Act
        Assert.True(store.TryApplyStandingDelta(PlayerId, GridFactionId, 15).Success);
        Assert.True(store.TryApplyStandingDelta(PlayerId, RustFactionId, 10).Success);
        // Assert
        Assert.Equal(15, store.TryGetStanding(PlayerId, GridFactionId).Standing);
        Assert.Equal(10, store.TryGetStanding(PlayerId, RustFactionId).Standing);
    }

    [Fact]
    public async Task Host_ShouldResolveFactionStandingStoresFromDi_WhenStartupSucceeds()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        using var client = factory.CreateClient();
        _ = await client.GetAsync("/health");
        // Act
        var standingStore = factory.Services.GetRequiredService<IFactionStandingStore>();
        var auditStore = factory.Services.GetRequiredService<IReputationDeltaStore>();
        var read = standingStore.TryGetStanding(PlayerId, GridFactionId);
        // Assert
        Assert.NotNull(auditStore);
        Assert.True(read.Success);
        Assert.Equal(0, read.Standing);
    }

    private static InMemoryFactionStandingStore CreateStore()
    {
        var registry = CreatePrototypeRegistry();
        var options = Options.Create(new GamePositionOptions { DevPlayerId = PlayerId });
        return new InMemoryFactionStandingStore(options, registry);
    }

    private static FactionDefinitionRegistry CreatePrototypeRegistry()
    {
        var byId = new Dictionary<string, FactionDefRow>(StringComparer.Ordinal)
        {
            [GridFactionId] = PrototypeE7M3FactionCatalogRules.ExpectedFactionFreeze[GridFactionId],
            [RustFactionId] = PrototypeE7M3FactionCatalogRules.ExpectedFactionFreeze[RustFactionId],
        };
        var catalog = new FactionDefinitionCatalog("/tmp/catalog", byId, catalogJsonFileCount: 1);
        return new FactionDefinitionRegistry(catalog);
    }
}