using System.Net;
using API.Data;
using API.GraphQL;
using API.Services;
using Microsoft.AspNetCore.Http;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.JSInterop;
using Model;
using Web.Services;

namespace Tests;

[TestFixture]
public class DeckBuilderServiceTests
{
    private AppDbContext _db = null!;
    private ITokenService _tokenService = null!;

    [SetUp]
    public void Setup()
    {
        var options = new DbContextOptionsBuilder<AppDbContext>()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options;

        _db = new AppDbContext(options);
        _tokenService = new TokenService();

        _db.Users.Add(new User { Username = "player1", Password = "password123", CreatedAt = DateTime.UtcNow });
        _db.SaveChanges();
    }

    [TearDown]
    public void TearDown()
    {
        _db.Database.EnsureDeleted();
        _db.Dispose();
    }

    [Test]
    public void UserDeck_ValidationRules_AreEnforcedCorrectly()
    {
        var deck = new UserDeck
        {
            Name = "My Test Deck",
            Season = "Season 1",
            Notes = "Test notes"
        };

        // Initially empty -> invalid
        Assert.That(deck.IsValid, Is.False);
        Assert.That(deck.ValidationMessage, Does.Contain("needs 40 more cards"));

        // Add 40 cards (13x3 + 1x1)
        for (int i = 0; i < 13; i++)
        {
            deck.Cards.Add($"Card_{i}");
            deck.Cards.Add($"Card_{i}");
            deck.Cards.Add($"Card_{i}");
        }
        deck.Cards.Add("Card_13");

        Assert.That(deck.Cards.Count, Is.EqualTo(40));
        Assert.That(deck.IsValid, Is.False); // Still needs 2 divers
        Assert.That(deck.ValidationMessage, Does.Contain("needs 2 more divers"));

        // Add 1 diver
        deck.Divers.Add("Diver_1");
        Assert.That(deck.IsValid, Is.False);
        Assert.That(deck.ValidationMessage, Does.Contain("needs 1 more diver"));

        // Add duplicate diver -> invalid
        deck.Divers.Add("Diver_1");
        Assert.That(deck.IsValid, Is.False);
        Assert.That(deck.ValidationMessage, Does.Contain("must be unique"));

        // Change second diver to a card that is in the deck -> invalid
        deck.Divers[1] = "Card_0";
        Assert.That(deck.IsValid, Is.False);
        Assert.That(deck.ValidationMessage, Does.Contain("cannot be in the main deck"));

        // Change second diver to a unique card not in deck -> valid!
        deck.Divers[1] = "Diver_2";
        Assert.That(deck.IsValid, Is.True);
        Assert.That(deck.ValidationMessage, Is.EqualTo("Deck is valid."));
    }

    [Test]
    public async Task GraphQL_SaveDeck_And_GetDecks_WorksEndToEnd()
    {
        var token = _tokenService.GenerateToken("player1");
        var httpContext = new DefaultHttpContext();
        httpContext.Request.Headers["Authorization"] = $"Bearer {token}";

        var accessor = new HttpContextAccessor { HttpContext = httpContext };
        var mutation = new Mutation();
        var query = new Query();

        var input = new UserDeckInput(
            Id: Guid.NewGuid(),
            Name: "Aggro Champions",
            Cards: ["CardA", "CardA", "CardA", "CardB"],
            Divers: ["DiverA", "DiverB"],
            Notes: "Early aggression deck notes",
            Season: "Season 1"
        );

        var savedDeck = await mutation.SaveDeck(_db, accessor, _tokenService, input);
        Assert.That(savedDeck, Is.Not.Null);
        Assert.That(savedDeck.Name, Is.EqualTo("Aggro Champions"));
        Assert.That(savedDeck.Notes, Is.EqualTo("Early aggression deck notes"));
        Assert.That(savedDeck.Season, Is.EqualTo("Season 1"));
        Assert.That(savedDeck.Cards.Count, Is.EqualTo(4));
        Assert.That(savedDeck.Divers.Count, Is.EqualTo(2));

        var fetchedDecks = await query.GetDecks(_db, accessor, _tokenService);
        Assert.That(fetchedDecks.Count, Is.EqualTo(1));
        Assert.That(fetchedDecks[0].Name, Is.EqualTo("Aggro Champions"));

        var singleDeck = await query.GetDeck(_db, accessor, _tokenService, savedDeck.Id);
        Assert.That(singleDeck, Is.Not.Null);
        Assert.That(singleDeck!.Name, Is.EqualTo("Aggro Champions"));

        var deleted = await mutation.DeleteDeck(_db, accessor, _tokenService, savedDeck.Id);
        Assert.That(deleted, Is.True);

        var remainingDecks = await query.GetDecks(_db, accessor, _tokenService);
        Assert.That(remainingDecks, Is.Empty);
    }

    [Test]
    public async Task UserDecksService_SaveAndGetDecks_WithMockHttp()
    {
        var mockHttp = new HttpClient(new TestHttpMessageHandler(req =>
        {
            var content = req.Content?.ReadAsStringAsync().Result ?? "";
            if (content.Contains("SaveDeck") || (req.Method == HttpMethod.Post && req.RequestUri?.AbsolutePath == "/api/decks"))
            {
                return new HttpResponseMessage(HttpStatusCode.OK)
                {
                    Content = new StringContent(@"{
                        ""data"": {
                            ""saveDeck"": {
                                ""id"": ""3fa85f64-5717-4562-b3fc-2c963f66afa6"",
                                ""name"": ""Test GraphQL Deck"",
                                ""cards"": [""Card1"", ""Card2""],
                                ""divers"": [""Diver1"", ""Diver2""],
                                ""notes"": ""Great deck"",
                                ""season"": ""Season 1"",
                                ""updatedAt"": ""2026-08-17T00:00:00Z""
                            }
                        }
                    }")
                };
            }
            if (content.Contains("GetDecks") || (req.Method == HttpMethod.Get && req.RequestUri?.AbsolutePath == "/api/decks"))
            {
                return new HttpResponseMessage(HttpStatusCode.OK)
                {
                    Content = new StringContent(@"{
                        ""data"": {
                            ""decks"": [
                                {
                                    ""id"": ""3fa85f64-5717-4562-b3fc-2c963f66afa6"",
                                    ""name"": ""Test GraphQL Deck"",
                                    ""cards"": [""Card1"", ""Card2""],
                                    ""divers"": [""Diver1"", ""Diver2""],
                                    ""notes"": ""Great deck"",
                                    ""season"": ""Season 1"",
                                    ""updatedAt"": ""2026-08-17T00:00:00Z""
                                }
                            ]
                        }
                    }")
                };
            }
            return new HttpResponseMessage(HttpStatusCode.BadRequest);
        }));

        var networkStatus = new NetworkStatusService(new DummyJsRuntime(true));
        await networkStatus.InitializeAsync();

        var sp = new ServiceCollection().BuildServiceProvider();
        var authService = new AuthService(mockHttp, networkStatus, sp);
        authService.SetAuth("player1", "test-token");

        var service = new UserDecksService(mockHttp, authService, networkStatus);

        var saved = await service.SaveDeckAsync(new UserDeck
        {
            Id = Guid.Parse("3fa85f64-5717-4562-b3fc-2c963f66afa6"),
            Name = "Test GraphQL Deck",
            Cards = ["Card1", "Card2"],
            Divers = ["Diver1", "Diver2"],
            Notes = "Great deck",
            Season = "Season 1"
        });

        Assert.That(saved, Is.Not.Null);
        Assert.That(saved!.Name, Is.EqualTo("Test GraphQL Deck"));
        Assert.That(saved.Season, Is.EqualTo("Season 1"));
        Assert.That(saved.Notes, Is.EqualTo("Great deck"));

        var decks = await service.GetDecksAsync();
        Assert.That(decks, Is.Not.Empty);
        Assert.That(decks[0].Name, Is.EqualTo("Test GraphQL Deck"));
    }

    [Test]
    public void DeckBuilder_CardSelection_ExcludesImmortalizedCards()
    {
        var sampleCards = new List<CardData>
        {
            new() { Name = "Card1", Category = "Agent" },
            new() { Name = "Card2", Category = "Spell" },
            new() { Name = "Card3", Category = "Immortalized" },
            new() { Name = "Card4", Category = "Agent", ImmortalizeFrom = "BaseCard" },
            new() { Name = "Card5", Category = "Artifact" }
        };

        var selectableCards = sampleCards
            .Where(c => (c.Category is "Agent" or "Spell") && !c.IsImmortalized)
            .ToList();

        Assert.That(selectableCards.Select(c => c.Name), Is.EquivalentTo(new[] { "Card1", "Card2" }));
    }

    [Test]
    public void DeckBuilder_DiverSelection_ExcludesImmortalizedCardsAndDeckCards()
    {
        var sampleCards = new List<CardData>
        {
            new() { Name = "Card1", Category = "Agent" },
            new() { Name = "Card2", Category = "Spell" },
            new() { Name = "Card3", Category = "Immortalized" },
            new() { Name = "Card4", Category = "Agent", ImmortalizeFrom = "BaseCard" },
            new() { Name = "Card5", Category = "Agent" }
        };
        var deckCards = new List<string> { "Card1" };
        var otherDiver = "Card5";

        var availableDivers = sampleCards
            .Where(c => (c.Category is "Agent" or "Spell") && !c.IsImmortalized)
            .Where(c => !deckCards.Contains(c.Name))
            .Where(c => c.Name != otherDiver)
            .ToList();

        Assert.That(availableDivers.Select(c => c.Name), Is.EquivalentTo(new[] { "Card2" }));
    }

    private class TestHttpMessageHandler : HttpMessageHandler
    {
        private readonly Func<HttpRequestMessage, HttpResponseMessage> _handler;

        public TestHttpMessageHandler(Func<HttpRequestMessage, HttpResponseMessage> handler)
        {
            _handler = handler;
        }

        protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,
            CancellationToken cancellationToken)
        {
            return Task.FromResult(_handler(request));
        }
    }

    private class DummyJsRuntime : IJSRuntime
    {
        private readonly bool _online;

        public DummyJsRuntime(bool online)
        {
            _online = online;
        }

        public ValueTask<TValue> InvokeAsync<TValue>(string identifier, object?[]? args)
        {
            if (identifier == "networkStatus.initialize" && typeof(TValue) == typeof(bool))
                return ValueTask.FromResult((TValue)(object)_online);
            return ValueTask.FromResult(default(TValue)!);
        }

        public ValueTask<TValue> InvokeAsync<TValue>(string identifier, CancellationToken cancellationToken,
            object?[]? args)
        {
            return InvokeAsync<TValue>(identifier, args);
        }
    }
}