using Microsoft.EntityFrameworkCore;
using RadicadeServer.DB;
using RadicadeServer.RecNet.Rooms;
using RadicadeServer.Utils;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// A dorm is the one room every player is certain to see, and it had no picture of its own: the
/// row carried RoomData's "default.png", which is not a file on disk, so the client drew its own
/// placeholder and every dorm looked the same in the panel. images.txt ships a Dorm picture, so a
/// dorm with nothing set gets it - while a dorm whose picture was set on purpose keeps it.
/// </summary>
public class DormRoomImageTests
{
    private static RecDBContext NewDb() =>
        new(TestDbOptions.Create()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options);

    private static RoomData Room(long id, string name, bool isDorm, string image, long creator = 1) => new()
    {
        RoomId = id,
        Name = name,
        Description = name,
        ImageName = image,
        CreatorAccountId = creator,
        IsDorm = isDorm,
        MaxPlayers = 10,
        CreatedAt = DateTime.UtcNow,
    };

    [Fact]
    public async Task ANewDormRoomGetsTheDormPicture()
    {
        var db = NewDb();

        await db.AddDormRoom();

        Assert.Equal("Dorm", (await db.Rooms.SingleAsync(room => room.IsDorm)).ImageName);
    }

    [Fact]
    public async Task DormsWithNoPictureOfTheirOwnGetTheDormPictureAndSetOnesAreLeftAlone()
    {
        var db = NewDb();
        db.Rooms.AddRange(
            Room(1, "DormRoom", isDorm: true, image: "default.png"),
            Room(2, "DormRoom", isDorm: true, image: "   "),
            Room(3, "DormRoom", isDorm: true, image: DBConfig.DefaultRoomImage),
            Room(4, "DormRoom", isDorm: true, image: "MyCustomDormPicture"),
            Room(5, "MyCoolRoom", isDorm: false, image: "default.png", creator: 2));
        db.SaveChanges();

        await db.NormalizeDormRoomImagesAsync();

        Assert.Equal("Dorm", (await db.Rooms.SingleAsync(room => room.RoomId == 1)).ImageName);
        Assert.Equal("Dorm", (await db.Rooms.SingleAsync(room => room.RoomId == 2)).ImageName);
        Assert.Equal("Dorm", (await db.Rooms.SingleAsync(room => room.RoomId == 3)).ImageName);
        Assert.Equal("MyCustomDormPicture", (await db.Rooms.SingleAsync(room => room.RoomId == 4)).ImageName);
        // Not a dorm: the room default there is somebody else's business.
        Assert.Equal("default.png", (await db.Rooms.SingleAsync(room => room.RoomId == 5)).ImageName);

        // Runs on every boot, so a second pass must be a no-op.
        await db.NormalizeDormRoomImagesAsync();
        Assert.Equal("MyCustomDormPicture", (await db.Rooms.SingleAsync(room => room.RoomId == 4)).ImageName);
    }

    [Fact]
    public void TheImagesSetShipsBothPictures()
    {
        var lines = File.ReadAllLines(Path.Combine(FindServerDirectory(), "images.txt"));

        Assert.Contains("Dorm=https://cdn.radicade.app/Dorm.png", lines);
        Assert.Contains("Showdown=https://cdn.radicade.app/Showdown.png", lines);
    }

    /// <summary>
    /// images.txt lives next to the project file and is copied to the test output too, so walk up
    /// from the test binary until the Server project's copy shows up.
    /// </summary>
    private static string FindServerDirectory()
    {
        var directory = new DirectoryInfo(AppContext.BaseDirectory);
        while (directory != null)
        {
            var candidate = Path.Combine(directory.FullName, "Server", "images.txt");
            if (File.Exists(candidate))
                return Path.Combine(directory.FullName, "Server");

            directory = directory.Parent;
        }

        throw new InvalidOperationException("could not find Server/images.txt from the test output directory");
    }
}