using System.Reflection;
using System.Security.Claims;
using System.Text.Json;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.EntityFrameworkCore;
using RadicadeServer.DB;
using RadicadeServer.RecNet.Accounts;
using RadicadeServer.RecNet.Enums;
using RadicadeServer.RecNet.Enums.Rooms;
using RadicadeServer.RecNet.Rooms;
using RadicadeServer.RoomServer;
using RadicadeServer.Utils;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// The Play menu's carousel rows read <c>rooms/carousel/{source}&amp;skip=&amp;take=</c>. The
/// client's own template for that feed is paged, and every sibling paged rooms feed answers
/// <c>{ Results, TotalResults }</c>; this one answered a bare array, which the client reported as
///
///     Malformed Response: '[ { "RoomId": 167, "IsDorm": false, ... } ]'
///
/// and then as <c>Error refreshing rooms from source CarouselEndpoint</c> - the row stayed empty.
///
/// The route assertion is here too: a controller-level test calls the handler by name, so it
/// cannot see that the URL the client builds has no route at all (that is what the 404 was
/// before this route existed).
/// </summary>
[Collection(DbFactoryCollection.Name)]
public class CarouselFeedShapeTests
{
    private const long RoomId = 167;
    private const long OtherRoomId = 211;

    private sealed class TestDbContextFactory : IDbContextFactory<RecDBContext>
    {
        private readonly DbContextOptions<RecDBContext> options = TestDbOptions.Create()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options;

        public RecDBContext CreateDbContext() => new(options);
    }

    private static (TestDbContextFactory Factory, RecDBContext Db) CreateContext()
    {
        var factory = new TestDbContextFactory();
        RoomUtils.DbFactory = factory;
        return (factory, factory.CreateDbContext());
    }

    private static void SetUser(Controller controller, long accountId)
    {
        var identity = new ClaimsIdentity("TestAuth");
        identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, accountId.ToString()));
        controller.ControllerContext = new ControllerContext
        {
            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal(identity) }
        };
    }

    /// <summary>Two public, live rooms - the shape a carousel row draws from.</summary>
    private static async Task SeedRoomsAsync(RecDBContext db)
    {
        db.Rooms.AddRange(
            new RoomData
            {
                RoomId = RoomId,
                Name = "Orientation",
                CreatorAccountId = 1,
                Accessibility = Accessibility.Public,
                State = RoomState.Active,
                MaxPlayers = 1,
                CreatedAt = DateTime.UtcNow,
            },
            new RoomData
            {
                RoomId = OtherRoomId,
                Name = "RecCenter",
                CreatorAccountId = 1,
                Accessibility = Accessibility.Public,
                State = RoomState.Active,
                MaxPlayers = 12,
                CreatedAt = DateTime.UtcNow,
            });
        await db.SaveChangesAsync();
    }

    private static JsonElement ValueOf(IActionResult result)
    {
        var ok = Assert.IsType<OkObjectResult>(result);
        return JsonSerializer.SerializeToElement(ok.Value);
    }

    [Fact]
    public void SupportsThePagedCarouselRouteTheClientBuilds()
    {
        var method = typeof(RoomServerAPI).GetMethod(nameof(RoomServerAPI.GetCarouselRooms))!;

        var attributes = method
            .GetCustomAttributes(typeof(HttpMethodAttribute), false)
            .Cast<HttpMethodAttribute>()
            .ToList();

        Assert.Contains(attributes, x => x.Template == "rooms/carousel/{*source}");
        Assert.Contains(attributes, x => x is HttpGetAttribute);
    }

    [Fact]
    public async Task TheCarouselRowAnswersThePagedEnvelopeWithRoomsInIt()
    {
        var (_, db) = CreateContext();
        await using var _db = db;
        await SeedRoomsAsync(db);

        var api = new RoomServerAPI(db);
        SetUser(api, 1);

        var value = ValueOf(await api.GetCarouselRooms("foryou", skip: -1, take: 20));

        Assert.Equal(JsonValueKind.Object, value.ValueKind);
        Assert.Equal(2, value.GetProperty("TotalResults").GetInt32());
        var results = value.GetProperty("Results").EnumerateArray().ToArray();
        Assert.Equal(new long[] { RoomId, OtherRoomId },
            results.Select(room => room.GetProperty("RoomId").GetInt64()).ToArray());
    }

    [Fact]
    public async Task ASourceThatMatchesNothingStillFillsTheRow()
    {
        var (_, db) = CreateContext();
        await using var _db = db;
        await SeedRoomsAsync(db);

        var api = new RoomServerAPI(db);
        SetUser(api, 1);

        // "rising" is one of the server's own ordering names, so it matches no room by name or
        // tag. An empty row is not the answer: the client marks the source failed.
        var value = ValueOf(await api.GetCarouselRooms("rising&skip=0&take=20", skip: -1, take: 20));

        Assert.Equal(2, value.GetProperty("TotalResults").GetInt32());
    }
}