using RadicadeServer.RecNet.Avatar;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// The loader prefers the fuller 2022-avatar.json and keeps avatar.json as a fallback, and it
/// only backfills metadata when the chosen catalog is missing it. These tests pin that
/// preference order so the served avatar list cannot silently fall back.
/// </summary>
public class AvatarCatalogSourceTests
{
    [Fact]
    public void NewerCatalogIsPreferredOverTheFallback()
    {
        Assert.Equal("2022-avatar.json", DBConfig.AvatarCatalogFileNames[0]);
        Assert.Contains("avatar.json", DBConfig.AvatarCatalogFileNames);
    }

    [Fact]
    public void CandidatePathsTryThePreferredFileInEveryDirectoryFirst()
    {
        var paths = DBConfig.AvatarCatalogCandidatePaths().ToArray();

        Assert.NotEmpty(paths);
        var firstFallback = Array.FindIndex(paths, path => path.EndsWith("avatar.json", StringComparison.OrdinalIgnoreCase)
            && !path.EndsWith("2022-avatar.json", StringComparison.OrdinalIgnoreCase));
        var lastPreferred = Array.FindLastIndex(paths, path => path.EndsWith("2022-avatar.json", StringComparison.OrdinalIgnoreCase));

        Assert.True(lastPreferred >= 0, "2022-avatar.json should be among the candidate paths.");
        Assert.True(firstFallback > lastPreferred,
            "every 2022-avatar.json location must be tried before any avatar.json location.");
    }

    [Fact]
    public void CompleteCatalogNeedsNoEnrichment()
    {
        var catalogJson = File.ReadAllText(Path.Combine(AppContext.BaseDirectory, "Fixtures", "avatar.json"));
        var items = AvatarUnlockCatalog.ParseCatalog(catalogJson);

        // The compact avatar.json carries no item ids, so it is enriched from merged-avatar.json.
        Assert.True(AvatarUnlockCatalog.NeedsMetadataEnrichment(items));
        Assert.False(AvatarUnlockCatalog.NeedsMetadataEnrichment(null));
        Assert.False(AvatarUnlockCatalog.NeedsMetadataEnrichment(Array.Empty<AvatarItem>()));
        Assert.False(AvatarUnlockCatalog.NeedsMetadataEnrichment(
            [new AvatarItem { AvatarItemDesc = "item,", AvatarItemId = 12, ThumbnailImage = "a.png" }]));
    }

    [Fact]
    public void ResolvableFilterDropsOnlyUnknownItems()
    {
        var original = DBConfig.ResolvableAvatarItemDescs;
        try
        {
            DBConfig.ResolvableAvatarItemDescs = new HashSet<string>(StringComparer.OrdinalIgnoreCase)
            {
                "8aa79563-ace1-4ba7-ad0c-f3210a78142f,"
            };

            var kept = AvatarUnlockCatalog.KeepResolvableItems(
            [
                new AvatarItem { AvatarItemDesc = "8aa79563-ace1-4ba7-ad0c-f3210a78142f,,," },
                new AvatarItem { AvatarItemDesc = "not-in-the-client-database,,," }
            ]);

            var item = Assert.Single(kept);
            Assert.Equal("8aa79563-ace1-4ba7-ad0c-f3210a78142f,", item.AvatarItemDesc);
        }
        finally
        {
            DBConfig.ResolvableAvatarItemDescs = original;
        }
    }

    [Fact]
    public void ResolvableFilterIsANoOpWithoutALookup()
    {
        var original = DBConfig.ResolvableAvatarItemDescs;
        try
        {
            DBConfig.ResolvableAvatarItemDescs = new HashSet<string>(StringComparer.OrdinalIgnoreCase);

            var kept = AvatarUnlockCatalog.KeepResolvableItems(
                [new AvatarItem { AvatarItemDesc = "anything," }]);

            Assert.Equal("anything,", Assert.Single(kept).AvatarItemDesc);
        }
        finally
        {
            DBConfig.ResolvableAvatarItemDescs = original;
        }
    }

    /// <summary>
    /// The client only ships assets for items released before its build, so a newer row makes it
    /// log "Unknown Material guid" and throw "Bad outfit string. No prefab found!". Rain Cloud
    /// Hat (2023-04-07) is the item that actually crashed a boot in the 20230301 build.
    /// </summary>
    [Fact]
    public void ItemsReleasedAfterTheClientBuildAreNotServed()
    {
        const string rainCloudHat = "24781418-38ad-411f-925e-2321fe616b51,";
        const string turkeySweater = "002a0f2f-1a24-4439-b578-470818ef8325,";

        var kept = AvatarUnlockCatalog.KeepClientAvailableItems(
        [
            new AvatarItem { AvatarItemDesc = rainCloudHat, CreatedAt = new DateTime(2023, 4, 7, 18, 16, 3, DateTimeKind.Utc) },
            new AvatarItem { AvatarItemDesc = turkeySweater, CreatedAt = new DateTime(2022, 11, 1, 17, 51, 50, DateTimeKind.Utc) },
            new AvatarItem { AvatarItemDesc = "no-release-date," },
            new AvatarItem { AvatarItemDesc = "offsetless,", CreatedAt = new DateTime(2023, 4, 7, 18, 16, 3, DateTimeKind.Unspecified) }
        ]);

        Assert.DoesNotContain(kept, item => item.AvatarItemDesc == rainCloudHat);
        Assert.DoesNotContain(kept, item => item.AvatarItemDesc == "offsetless,");
        Assert.Contains(kept, item => item.AvatarItemDesc == turkeySweater);
        Assert.Contains(kept, item => item.AvatarItemDesc == "no-release-date,");
    }

    [Fact]
    public void ReleaseCutoffIsTheClientBuildDate()
    {
        Assert.Equal(new DateTime(2023, 3, 1, 0, 0, 0, DateTimeKind.Utc), DBConfig.AvatarItemReleaseCutoffUtc);
    }

    [Fact]
    public void ShippedLookupCoversTheCatalogServedToClients()
    {
        var lookupPath = Path.Combine(AppContext.BaseDirectory, "Fixtures", "avatar-item-lookup.json");
        var catalogPath = Path.Combine(AppContext.BaseDirectory, "Fixtures", "2022-avatar.json");
        if (!File.Exists(lookupPath) || !File.Exists(catalogPath))
        {
            return;
        }

        var descriptions = System.Text.Json.JsonDocument.Parse(File.ReadAllText(lookupPath))
            .RootElement.GetProperty("descriptions")
            .EnumerateArray()
            .Select(element => element.GetString()!)
            .Where(description => !string.IsNullOrWhiteSpace(description))
            .ToHashSet(StringComparer.OrdinalIgnoreCase);

        Assert.True(descriptions.Count > 2000, $"lookup only lists {descriptions.Count} descriptions");

        var original = DBConfig.ResolvableAvatarItemDescs;
        var originalCatalog = DBConfig.DefaultAvatarCatalog;
        var originalFallback = DBConfig.DefaultAvatarUnlocks;
        try
        {
            DBConfig.ResolvableAvatarItemDescs = descriptions;
            DBConfig.DefaultAvatarCatalog = File.ReadAllText(catalogPath);
            DBConfig.DefaultAvatarUnlocks = "[]";

            var served = AvatarUnlockCatalog.GetSafeDefaultItems();

            Assert.NotEmpty(served);
            Assert.Equal(2990, descriptions.Count);
            Assert.Equal(AvatarUnlockCatalog.ParseCatalog(DBConfig.DefaultAvatarCatalog).Count, served.Count);
            Assert.DoesNotContain(served, item => !descriptions.Contains(item.AvatarItemDesc));
            Assert.DoesNotContain(served, item => AvatarItemDescription.HasEmptyMaterialSlot(item.AvatarItemDesc));
            Assert.DoesNotContain(served, item =>
                item.CreatedAt != default && item.CreatedAt.ToUniversalTime() >= DBConfig.AvatarItemReleaseCutoffUtc);
            // This item is present in the September client, unlike the old March lookup.
            Assert.Contains(served, item =>
                item.AvatarItemDesc.StartsWith("24781418-38ad-411f-925e-2321fe616b51", StringComparison.OrdinalIgnoreCase));
        }
        finally
        {
            DBConfig.ResolvableAvatarItemDescs = original;
            DBConfig.DefaultAvatarCatalog = originalCatalog;
            DBConfig.DefaultAvatarUnlocks = originalFallback;
        }
    }

    [Fact]
    public void ShippedCatalogHasUniqueServerIdsAndRetainsKnownMetadata()
    {
        var path = Path.Combine(AppContext.BaseDirectory, "Fixtures", "2022-avatar.json");
        if (!File.Exists(path))
        {
            // The fixture is optional: without it the loader simply falls back to avatar.json.
            return;
        }

        var items = AvatarUnlockCatalog.ParseCatalog(File.ReadAllText(path));

        Assert.NotEmpty(items);
        Assert.DoesNotContain(items, item => AvatarItemDescription.HasEmptyMaterialSlot(item.AvatarItemDesc));
        Assert.DoesNotContain(items, item => item.AvatarItemId <= 0);
        Assert.Equal(items.Count, items.Select(item => item.AvatarItemId).Distinct().Count());
        Assert.DoesNotContain(items, item => string.IsNullOrWhiteSpace(item.FriendlyName));
        Assert.Contains(items, item => item.FriendlyName == "NFL Houston Texans Hat"
            && !string.IsNullOrWhiteSpace(item.ThumbnailImage));
        // New client-only entries have no known store thumbnail; do not invent image URLs.
        Assert.True(AvatarUnlockCatalog.NeedsMetadataEnrichment(items));
    }
}