using Microsoft.Extensions.DependencyInjection;
using NeonSprawl.Server.Game.Encounters;
using NeonSprawl.Server.Tests;
using Xunit;

namespace NeonSprawl.Server.Tests.Game.Encounters;

public class EncounterDefinitionRegistryTests
{
    private const string PrototypeCombatPocket = "prototype_combat_pocket";

    private static EncounterDefinitionRegistry CreateRegistryFromRows(IReadOnlyDictionary<string, EncounterDefRow> byId)
    {
        var catalog = new EncounterDefinitionCatalog("/tmp/encounters", byId, catalogJsonFileCount: 1);
        return new EncounterDefinitionRegistry(catalog);
    }

    private static EncounterDefRow CreatePrototypeCombatPocketRow() =>
        new(
            PrototypeCombatPocket,
            "Prototype Combat Pocket",
            "defeat_all_targets",
            ["prototype_npc_melee", "prototype_npc_ranged", "prototype_npc_elite"],
            "prototype_combat_pocket_clear");

    [Fact]
    public void TryGetDefinition_ShouldReturnTrueAndExpectedMetadata_WhenIdExists()
    {
        // Arrange
        var rows = new Dictionary<string, EncounterDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocket] = CreatePrototypeCombatPocketRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryGetDefinition(PrototypeCombatPocket, out var def);
        // Assert
        Assert.True(found);
        Assert.NotNull(def);
        Assert.Equal("Prototype Combat Pocket", def!.DisplayName);
        Assert.Equal("defeat_all_targets", def.CompletionCriteriaKind);
        Assert.Equal("prototype_combat_pocket_clear", def.RewardTableId);
        Assert.Equal(3, def.RequiredNpcInstanceIds.Count);
        Assert.Contains("prototype_npc_melee", def.RequiredNpcInstanceIds);
    }

    [Fact]
    public void TryGetDefinition_ShouldReturnFalse_WhenEncounterIdIsNull()
    {
        // Arrange
        var rows = new Dictionary<string, EncounterDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocket] = CreatePrototypeCombatPocketRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryGetDefinition(null, out var def);
        // Assert
        Assert.False(found);
        Assert.Null(def);
    }

    [Fact]
    public void TryGetDefinition_ShouldReturnFalse_WhenIdUnknown()
    {
        // Arrange
        var rows = new Dictionary<string, EncounterDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocket] = CreatePrototypeCombatPocketRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryGetDefinition("not_a_real_encounter", out var def);
        // Assert
        Assert.False(found);
        Assert.Null(def);
    }

    [Fact]
    public void TryNormalizeKnown_ShouldReturnTrueAndLowercaseId_WhenInputHasWhitespaceAndMixedCase()
    {
        // Arrange
        var rows = new Dictionary<string, EncounterDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocket] = CreatePrototypeCombatPocketRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryNormalizeKnown("  Prototype_Combat_Pocket  ", out var normalized);
        // Assert
        Assert.True(found);
        Assert.Equal(PrototypeCombatPocket, normalized);
    }

    [Fact]
    public void TryNormalizeKnown_ShouldReturnFalse_WhenInputIsNull()
    {
        // Arrange
        var rows = new Dictionary<string, EncounterDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocket] = CreatePrototypeCombatPocketRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryNormalizeKnown(null, out var normalized);
        // Assert
        Assert.False(found);
        Assert.Equal(string.Empty, normalized);
    }

    [Fact]
    public void TryNormalizeKnown_ShouldReturnFalse_WhenInputIsWhitespaceOnly()
    {
        // Arrange
        var rows = new Dictionary<string, EncounterDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocket] = CreatePrototypeCombatPocketRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryNormalizeKnown("   ", out var normalized);
        // Assert
        Assert.False(found);
        Assert.Equal(string.Empty, normalized);
    }

    [Fact]
    public void TryNormalizeKnown_ShouldReturnFalse_WhenIdNotInCatalog()
    {
        // Arrange
        var rows = new Dictionary<string, EncounterDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocket] = CreatePrototypeCombatPocketRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryNormalizeKnown("prototype_unknown", out var normalized);
        // Assert
        Assert.False(found);
        Assert.Equal("prototype_unknown", normalized);
    }

    [Fact]
    public void GetDefinitionsInIdOrder_ShouldListAllRowsOrderedById_WhenMultipleEncounters()
    {
        // Arrange
        var rows = new Dictionary<string, EncounterDefRow>(StringComparer.Ordinal)
        {
            ["z_encounter"] = new EncounterDefRow(
                "z_encounter",
                "Z",
                "defeat_all_targets",
                ["prototype_npc_melee"],
                "prototype_combat_pocket_clear"),
            [PrototypeCombatPocket] = CreatePrototypeCombatPocketRow(),
            ["a_encounter"] = new EncounterDefRow(
                "a_encounter",
                "A",
                "defeat_all_targets",
                ["prototype_npc_melee"],
                "prototype_combat_pocket_clear"),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var list = registry.GetDefinitionsInIdOrder();
        // Assert
        Assert.Equal(3, list.Count);
        Assert.Equal("a_encounter", list[0].Id);
        Assert.Equal(PrototypeCombatPocket, list[1].Id);
        Assert.Equal("z_encounter", list[2].Id);
    }

    [Fact]
    public async Task Host_ShouldResolveRegistriesFromDi_WhenStartupSucceeds()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        using var client = factory.CreateClient();
        _ = await client.GetAsync("/health");
        // Act
        var encounterRegistry = factory.Services.GetRequiredService<IEncounterDefinitionRegistry>();
        var rewardRegistry = factory.Services.GetRequiredService<IRewardTableDefinitionRegistry>();
        var encounterFound = encounterRegistry.TryGetDefinition(PrototypeCombatPocket, out var encounter);
        var unknownEncounter = encounterRegistry.TryGetDefinition("not_a_real_encounter", out var missingEncounter);
        var normalizedEncounter = encounterRegistry.TryNormalizeKnown(" Prototype_Combat_Pocket ", out var encounterId);
        var rewardFound = rewardRegistry.TryGetDefinition("prototype_combat_pocket_clear", out var rewardTable);
        var unknownReward = rewardRegistry.TryNormalizeKnown("prototype_unknown", out var unknownRewardId);
        var encounterList = encounterRegistry.GetDefinitionsInIdOrder();
        // Assert
        Assert.True(encounterFound);
        Assert.NotNull(encounter);
        Assert.Equal("prototype_combat_pocket_clear", encounter!.RewardTableId);
        Assert.False(unknownEncounter);
        Assert.Null(missingEncounter);
        Assert.True(normalizedEncounter);
        Assert.Equal(PrototypeCombatPocket, encounterId);
        Assert.True(rewardFound);
        Assert.NotNull(rewardTable);
        Assert.Equal(10, rewardTable!.FixedGrants.First(g => g.ItemId == "scrap_metal_bulk").Quantity);
        Assert.False(unknownReward);
        Assert.Equal("prototype_unknown", unknownRewardId);
        Assert.Single(encounterList);
        Assert.Equal(PrototypeCombatPocket, encounterList[0].Id);
    }

    [Fact]
    public async Task Host_ShouldResolveEncounterProgressStoresFromDi_WhenStartupSucceeds()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        using var client = factory.CreateClient();
        _ = await client.GetAsync("/health");
        var progressStore = factory.Services.GetRequiredService<IEncounterProgressStore>();
        var completionStore = factory.Services.GetRequiredService<IEncounterCompletionStore>();
        var completeEventStore = factory.Services.GetRequiredService<IEncounterCompleteEventStore>();
        // Act
        var activated = progressStore.TryActivate("dev-local-1", PrototypeCombatPocket);
        var completed = completionStore.TryMarkCompleted(
            "dev-local-1",
            PrototypeCombatPocket,
            new DateTimeOffset(2026, 5, 31, 12, 0, 0, TimeSpan.Zero));
        // Assert
        Assert.True(activated);
        Assert.True(completed);
        Assert.True(completionStore.IsCompleted("dev-local-1", PrototypeCombatPocket));
        Assert.IsType<InMemoryEncounterCompleteEventStore>(completeEventStore);
    }
}