using System.Security.Claims;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Infrastructure;
using Microsoft.EntityFrameworkCore.Storage;
using RadicadeServer.DB;
using RadicadeServer.RecNet;
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 "Similar Rooms" rail (<c>GET rooms/rooms/{id}/similar</c>).
///
/// The route answered a BARE ARRAY, which the client's list DTO cannot parse: its rows are objects
/// (<c>PagedResultsDTO&lt;RoomDTO&gt;</c>), so the response came back as
/// <c>Malformed Response: '[]'</c> in Player.log and the rail rendered empty. An unknown room was a
/// 404 on top of that, which stalls the screen the rail sits on rather than emptying one row.
/// </summary>
[Collection(DbFactoryCollection.Name)]
public class SimilarRoomsTests
{
    private sealed class TestDbContextFactory : IDbContextFactory<RecDBContext>
    {
        private readonly DbContextOptions<RecDBContext> options;

        public TestDbContextFactory()
        {
            var root = new InMemoryDatabaseRoot();
            options = TestDbOptions.Create()
                .UseInMemoryDatabase(Guid.NewGuid().ToString(), root)
                .Options;
        }

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

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

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

    private static V2_RoomsAPI NewApi(RecDBContext db, long callerId = 2)
    {
        var identity = new ClaimsIdentity("TestAuth");
        identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, callerId.ToString()));

        return new V2_RoomsAPI(db)
        {
            ControllerContext = new ControllerContext
            {
                HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal(identity) }
            }
        };
    }

    private static RoomData Room(long id, string name, string tags, Accessibility accessibility = Accessibility.Public) => new()
    {
        RoomId = id,
        Name = name,
        CreatorAccountId = 2,
        Accessibility = accessibility,
        Tags = tags,
        State = RoomState.Active,
    };

    [Fact]
    public async Task SimilarRoomsAnswerAPagedObjectAndNotABareArray()
    {
        var (_, db) = NewContext();
        db.Rooms.Add(Room(10, "Source", "import,0|horror,0"));
        db.Rooms.Add(Room(11, "SharesTag", "import,0"));
        db.Rooms.Add(Room(12, "Unrelated", "art,0"));
        await db.SaveChangesAsync();

        var result = await NewApi(db).GetSimilarRooms(10, 0, 100);

        var ok = Assert.IsType<OkObjectResult>(result);
        var page = Assert.IsType<RoomSearchResult>(ok.Value);
        Assert.Equal(1, page.TotalResults);
        Assert.Single(page.Results);
        Assert.Equal(11, page.Results[0].RoomId);
    }

    [Fact]
    public async Task AnUnknownRoomAnswersAnEmptyPageRatherThan404()
    {
        var (_, db) = NewContext();

        var result = await NewApi(db).GetSimilarRooms(99999, 0, 100);

        var ok = Assert.IsType<OkObjectResult>(result);
        var page = Assert.IsType<RoomSearchResult>(ok.Value);
        Assert.Equal(0, page.TotalResults);
        Assert.Empty(page.Results);
    }

    [Fact]
    public async Task PaginationPagesTheRowsAndCountsThemAll()
    {
        var (_, db) = NewContext();
        db.Rooms.Add(Room(20, "Source", "import,0"));
        for (var id = 21; id < 25; id++) db.Rooms.Add(Room(id, "Shares" + id, "import,0"));
        await db.SaveChangesAsync();

        var result = await NewApi(db).GetSimilarRooms(20, 1, 2);

        var page = Assert.IsType<RoomSearchResult>(Assert.IsType<OkObjectResult>(result).Value);
        Assert.Equal(4, page.TotalResults);
        Assert.Equal(2, page.Results.Count);
    }

    [Fact]
    public async Task RoomsTheCallerMayNotSeeAreNeverInTheRail()
    {
        var (_, db) = NewContext();
        db.Rooms.Add(Room(30, "Source", "import,0"));
        db.Rooms.Add(Room(31, "Hidden", "import,0", Accessibility.Private));
        await db.SaveChangesAsync();

        var page = Assert.IsType<RoomSearchResult>(
            Assert.IsType<OkObjectResult>(await NewApi(db).GetSimilarRooms(30, 0, 100)).Value);

        Assert.Equal(0, page.TotalResults);
    }
}