using NeonSprawl.Server.Game.Encounters;

namespace NeonSprawl.Server.Tests.Game.Encounters;

public class RewardTableDefinitionRegistryTests
{
    private const string PrototypeCombatPocketClear = "prototype_combat_pocket_clear";

    private static RewardTableDefinitionRegistry CreateRegistryFromRows(IReadOnlyDictionary<string, RewardTableDefRow> byId)
    {
        var catalog = new RewardTableDefinitionCatalog("/tmp/reward-tables", byId, catalogJsonFileCount: 1);
        return new RewardTableDefinitionRegistry(catalog);
    }

    private static RewardTableDefRow CreatePrototypeCombatPocketClearRow() =>
        new(
            PrototypeCombatPocketClear,
            "Prototype Combat Pocket Clear",
            [
                new RewardGrantRow("scrap_metal_bulk", 10),
                new RewardGrantRow("contract_handoff_token", 1),
            ]);

    [Fact]
    public void TryGetDefinition_ShouldReturnTrueAndExpectedMetadata_WhenIdExists()
    {
        // Arrange
        var rows = new Dictionary<string, RewardTableDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocketClear] = CreatePrototypeCombatPocketClearRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryGetDefinition(PrototypeCombatPocketClear, out var def);
        // Assert
        Assert.True(found);
        Assert.NotNull(def);
        Assert.Equal("Prototype Combat Pocket Clear", def!.DisplayName);
        Assert.Equal(10, def.FixedGrants.First(g => g.ItemId == "scrap_metal_bulk").Quantity);
        Assert.Equal(1, def.FixedGrants.First(g => g.ItemId == "contract_handoff_token").Quantity);
    }

    [Fact]
    public void TryGetDefinition_ShouldReturnFalse_WhenRewardTableIdIsNull()
    {
        // Arrange
        var rows = new Dictionary<string, RewardTableDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocketClear] = CreatePrototypeCombatPocketClearRow(),
        };
        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, RewardTableDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocketClear] = CreatePrototypeCombatPocketClearRow(),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var found = registry.TryGetDefinition("not_a_real_reward_table", out var def);
        // Assert
        Assert.False(found);
        Assert.Null(def);
    }

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

    [Fact]
    public void TryNormalizeKnown_ShouldReturnFalse_WhenInputIsNull()
    {
        // Arrange
        var rows = new Dictionary<string, RewardTableDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocketClear] = CreatePrototypeCombatPocketClearRow(),
        };
        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, RewardTableDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocketClear] = CreatePrototypeCombatPocketClearRow(),
        };
        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, RewardTableDefRow>(StringComparer.Ordinal)
        {
            [PrototypeCombatPocketClear] = CreatePrototypeCombatPocketClearRow(),
        };
        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_WhenMultipleRewardTables()
    {
        // Arrange
        var rows = new Dictionary<string, RewardTableDefRow>(StringComparer.Ordinal)
        {
            ["z_table"] = new RewardTableDefRow("z_table", "Z", [new RewardGrantRow("scrap_metal_bulk", 1)]),
            [PrototypeCombatPocketClear] = CreatePrototypeCombatPocketClearRow(),
            ["a_table"] = new RewardTableDefRow("a_table", "A", [new RewardGrantRow("scrap_metal_bulk", 1)]),
        };
        var registry = CreateRegistryFromRows(rows);
        // Act
        var list = registry.GetDefinitionsInIdOrder();
        // Assert
        Assert.Equal(3, list.Count);
        Assert.Equal("a_table", list[0].Id);
        Assert.Equal(PrototypeCombatPocketClear, list[1].Id);
        Assert.Equal("z_table", list[2].Id);
    }

    [Fact]
    public async Task Host_ShouldResolveRegistryFromDi_WhenStartupSucceeds()
    {
        // Arrange
        await using var factory = new InMemoryWebApplicationFactory();
        using var client = factory.CreateClient();
        _ = await client.GetAsync("/health");
        // Act
        var registry = factory.Services.GetRequiredService<IRewardTableDefinitionRegistry>();
        var found = registry.TryGetDefinition(PrototypeCombatPocketClear, out var rewardTable);
        var unknown = registry.TryGetDefinition("not_a_real_reward_table", out var missing);
        var normalized = registry.TryNormalizeKnown(" Prototype_Combat_Pocket_Clear ", out var rewardTableId);
        var list = registry.GetDefinitionsInIdOrder();
        // Assert
        Assert.True(found);
        Assert.NotNull(rewardTable);
        Assert.Equal(10, rewardTable!.FixedGrants.First(g => g.ItemId == "scrap_metal_bulk").Quantity);
        Assert.Equal(1, rewardTable.FixedGrants.First(g => g.ItemId == "contract_handoff_token").Quantity);
        Assert.False(unknown);
        Assert.Null(missing);
        Assert.True(normalized);
        Assert.Equal(PrototypeCombatPocketClear, rewardTableId);
        Assert.Single(list);
        Assert.Equal(PrototypeCombatPocketClear, list[0].Id);
    }
}