using System.Reflection;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Routing;
using Microsoft.EntityFrameworkCore;
using RadicadeServer.Admin;
using RadicadeServer.Clubs;
using RadicadeServer.DB;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// Setting a club's image from the admin panel: <c>POST admin/clubs/upload/image</c> and
/// <c>GET admin/clubs/set/image</c>.
///
/// Clubs are JSON in the "Clubs" server config rather than a table, so the panel's generic table
/// routes cannot reach one and these two endpoints are the whole of the write path. The name they
/// store is the one <see cref="ClubStore.BuildClub"/> hands the client as MainImageName, so the
/// image the panel picks is the image the game shows.
/// </summary>
[Collection(DbFactoryCollection.Name)]
public class AdminClubImageTests
{
    private const string Secret = "test-club-image-secret";
    private const long OwnerId = 77;

    private static RecDBContext NewDb() => new(
        TestDbOptions.Create()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options);

    private static async Task<long> CreateClubAsync(RecDBContext db)
    {
        var club = await ClubStore.CreateAsync(db, OwnerId, "Image Test Club", "a club");
        return club.clubId;
    }

    private static IFormFile FormFile(string name, byte[] bytes) =>
        new FormFile(new MemoryStream(bytes), 0, bytes.Length, "file", name);

    // A real PNG header, so the file has the bytes its extension claims.
    private static readonly byte[] PngBytes = [0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A];

    /// <summary>Runs an action with the admin secret and CDN image folder pointed at a temp dir.</summary>
    private static async Task<T> WithAdminAsync<T>(string imagesDirectory, Func<Task<T>> action)
    {
        var originalKey = DBConfig.AdminApiKey;
        var originalImages = DBConfig.CDNImages;
        DBConfig.AdminApiKey = Secret;
        DBConfig.CDNImages = imagesDirectory;
        try
        {
            return await action();
        }
        finally
        {
            DBConfig.AdminApiKey = originalKey;
            DBConfig.CDNImages = originalImages;
        }
    }

    private static string TempImages() =>
        Path.Combine(Path.GetTempPath(), "radicade-club-image-" + Guid.NewGuid().ToString("N"));

    [Fact]
    public void ThePanelCallsTheseRoutes()
    {
        var setImage = typeof(AdminClubAPI).GetMethod(nameof(AdminClubAPI.SetImage))!;
        Assert.Contains("set/image", setImage
            .GetCustomAttributes(typeof(HttpMethodAttribute), false)
            .Cast<HttpMethodAttribute>()
            .Select(attribute => attribute.Template));

        var upload = typeof(AdminClubAPI).GetMethod(nameof(AdminClubAPI.UploadImage))!;
        Assert.Contains("upload/image", upload
            .GetCustomAttributes(typeof(HttpMethodAttribute), false)
            .Cast<HttpMethodAttribute>()
            .Select(attribute => attribute.Template));

        // The controller's own prefix is what the panel's fetch URLs are built from.
        var prefix = typeof(AdminClubAPI).GetCustomAttributes(typeof(RouteAttribute), false)
            .Cast<RouteAttribute>()
            .Single();
        Assert.Equal("admin/clubs", prefix.Template);
    }

    [Fact]
    public async Task SetImageNamesTheImageTheGameIsServed()
    {
        var db = NewDb();
        var clubId = await CreateClubAsync(db);
        var api = new AdminClubAPI(db);

        var result = await WithAdminAsync(TempImages(), () => api.SetImage(Secret, clubId, "custom-club.png"));

        Assert.IsType<OkObjectResult>(result);
        var club = await ClubStore.GetAsync(db, clubId);
        Assert.Equal("custom-club.png", club!.imageName);

        // What the client is actually told is the name that matters.
        var served = (Dictionary<string, object?>)ClubStore.BuildClub(club, OwnerId);
        Assert.Equal("custom-club.png", served["MainImageName"]);
    }

    [Fact]
    public async Task AnEmptyNamePutsTheClubBackOnTheDefaultImage()
    {
        var db = NewDb();
        var clubId = await CreateClubAsync(db);
        var api = new AdminClubAPI(db);

        await WithAdminAsync(TempImages(), () => api.SetImage(Secret, clubId, "something.png"));
        // Clearing is the same call with an empty name, which is what the panel sends.
        var result = await WithAdminAsync(TempImages(), () => api.SetImage(Secret, clubId, ""));

        Assert.IsType<OkObjectResult>(result);
        var club = await ClubStore.GetAsync(db, clubId);
        Assert.Equal(ClubStore.DefaultImageName, club!.imageName);
    }

    [Fact]
    public async Task SetImageKeepsOnlyTheFileName()
    {
        var db = NewDb();
        var clubId = await CreateClubAsync(db);
        var api = new AdminClubAPI(db);

        // An image name is a key into the CDN's image folder, so a path must not survive.
        await WithAdminAsync(TempImages(), () => api.SetImage(Secret, clubId, "../../elsewhere/evil.png"));

        var club = await ClubStore.GetAsync(db, clubId);
        Assert.Equal("evil.png", club!.imageName);
    }

    [Fact]
    public async Task SetImageRefusesAnInvalidKeyAndAnUnknownClub()
    {
        var db = NewDb();
        var clubId = await CreateClubAsync(db);
        var api = new AdminClubAPI(db);

        var wrongKey = await api.SetImage("not-the-secret", clubId, "x.png");
        Assert.IsType<UnauthorizedObjectResult>(wrongKey);

        var missing = await WithAdminAsync(TempImages(), () => api.SetImage(Secret, clubId + 9999, "x.png"));
        Assert.IsType<NotFoundObjectResult>(missing);

        // Neither attempt touched the club.
        var club = await ClubStore.GetAsync(db, clubId);
        Assert.Equal(ClubStore.DefaultImageName, club!.imageName);
    }

    [Fact]
    public async Task UploadStoresTheFileAndNamesItOnTheClub()
    {
        var directory = TempImages();
        var db = NewDb();
        var clubId = await CreateClubAsync(db);
        var api = new AdminClubAPI(db);

        try
        {
            var result = await WithAdminAsync(directory, () => api.UploadImage(Secret, clubId, FormFile("logo.png", PngBytes)));

            var ok = Assert.IsType<OkObjectResult>(result);
            var club = await ClubStore.GetAsync(db, clubId);
            Assert.EndsWith(".png", club!.imageName);
            Assert.True(File.Exists(Path.Join(directory, club.imageName)));

            // The response names the URL the panel shows, so it has to point at the stored file.
            Assert.Contains($"/images/img/{club.imageName}", ok.Value!.ToString());
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }

    [Fact]
    public async Task UploadRefusesAFileThatIsNotAnImageAndLeavesNothingBehind()
    {
        var directory = TempImages();
        var db = NewDb();
        var clubId = await CreateClubAsync(db);
        var api = new AdminClubAPI(db);

        try
        {
            var result = await WithAdminAsync(directory, () => api.UploadImage(Secret, clubId, FormFile("save.room", PngBytes)));

            Assert.IsType<BadRequestObjectResult>(result);
            Assert.False(Directory.Exists(directory));
            var club = await ClubStore.GetAsync(db, clubId);
            Assert.Equal(ClubStore.DefaultImageName, club!.imageName);
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }

    [Fact]
    public async Task UploadRefusesAnEmptyFile()
    {
        var directory = TempImages();
        var db = NewDb();
        var clubId = await CreateClubAsync(db);
        var api = new AdminClubAPI(db);

        try
        {
            var result = await WithAdminAsync(directory, () => api.UploadImage(Secret, clubId, FormFile("logo.png", [])));

            Assert.IsType<BadRequestObjectResult>(result);
            var club = await ClubStore.GetAsync(db, clubId);
            Assert.Equal(ClubStore.DefaultImageName, club!.imageName);
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }

    [Fact]
    public async Task UploadOnAnUnknownClubWritesNoFile()
    {
        var directory = TempImages();
        var db = NewDb();
        var clubId = await CreateClubAsync(db);
        var api = new AdminClubAPI(db);

        try
        {
            // The club is looked up before the upload is stored, so a mistyped club id cannot
            // leave an orphaned file in the CDN.
            var result = await WithAdminAsync(directory, () => api.UploadImage(Secret, clubId + 9999, FormFile("logo.png", PngBytes)));

            Assert.IsType<NotFoundObjectResult>(result);
            Assert.False(Directory.Exists(directory));
        }
        finally
        {
            if (Directory.Exists(directory)) Directory.Delete(directory, true);
        }
    }
}