using System.Security.Claims;
using System.Text.Json;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using RadicadeServer.API.Relationships.V1;
using RadicadeServer.API.Relationships.V2;
using RadicadeServer.DB;
using RadicadeServer.RecNet.CDN;
using RadicadeServer.RecNet.Enums;
using RadicadeServer.RecNet.Images;
using RadicadeServer.RecNet.Relationships;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// Wire-contract tests for the images and relationships endpoints: the key
/// spellings the 2023 client deserializes, the cheer-state isolation between
/// images, and the pending-request guard on accepting friend requests.
/// </summary>
public class ImagesAndRelationshipsTests
{
    private const long CallerId = 42;
    private const long OtherId = 77;

    private static RecDBContext CreateDb()
    {
        var options = TestDbOptions.Create()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options;
        return new RecDBContext(options);
    }

    private static T CreateController<T>(RecDBContext db, long? userId = CallerId) where T : Controller
    {
        var identity = new ClaimsIdentity("TestAuth");
        if (userId.HasValue)
            identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, userId.Value.ToString()));

        var controller = (T)Activator.CreateInstance(typeof(T), db)!;
        controller.ControllerContext = new ControllerContext
        {
            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal(identity) }
        };
        return controller;
    }

    private static ImageDB Photo(long id, long owner, SavedImageAccessibility access,
        SavedImageType type, long? roomId = null, string? tags = null) => new()
    {
        Id = id,
        Name = $"img{id}.png",
        OwnerId = owner,
        Accessibility = access,
        ImageType = type,
        RoomId = roomId,
        PlayerIds = tags ?? "[]",
        CreatedAt = new DateTime(2026, 1, 1).AddHours(id)
    };

    // ---- images ------------------------------------------------------------

    [Fact]
    public async Task PlayerPhotoList_ServesDualKeyProjection()
    {
        using var db = CreateDb();
        db.Images.AddRange(
            Photo(1, CallerId, SavedImageAccessibility.Public, SavedImageType.ShareCamera),
            Photo(2, CallerId, SavedImageAccessibility.Public, SavedImageType.ShareCamera),
            Photo(3, CallerId, SavedImageAccessibility.Private, SavedImageType.ShareCamera));
        await db.SaveChangesAsync();

        var api = CreateController<RadicadeServer.API.ImagesAPI>(db);
        var result = await api.GetImagesFromPlayer(CallerId);

        Assert.Equal(2, result.Count);

        // Newest first: image 2 leads, image 1 follows.
        Assert.Equal(2L, (long)result[0].GetType().GetProperty("Id")!.GetValue(result[0])!);

        var first = JsonSerializer.Serialize(result[1]);
        using var doc = JsonDocument.Parse(first);
        var root = doc.RootElement;

        // Both key spellings must be present: the raw projection (Id/Type) that
        // captured 2022 responses used, and the ImagesPlayer projection
        // (SavedImageId/SavedImageType) the 2023 client's photo grids read.
        Assert.Equal(1, root.GetProperty("Id").GetInt64());
        Assert.Equal(1, root.GetProperty("SavedImageId").GetInt64());
        Assert.Equal(1, root.GetProperty("Type").GetInt32());
        Assert.Equal(1, root.GetProperty("SavedImageType").GetInt32());
        Assert.Equal("img1.png", root.GetProperty("ImageName").GetString());
    }

    [Fact]
    public async Task CheerImage_IsIsolatedPerImage()
    {
        using var db = CreateDb();
        db.Images.AddRange(
            Photo(1, CallerId, SavedImageAccessibility.Public, SavedImageType.ShareCamera),
            Photo(2, CallerId, SavedImageAccessibility.Public, SavedImageType.ShareCamera));
        await db.SaveChangesAsync();

        var api = CreateController<RadicadeServer.API.ImagesAPI>(db);
        api.ControllerContext.HttpContext.Request.ContentType = "application/json";
        api.ControllerContext.HttpContext.Request.Body =
            new MemoryStream(JsonSerializer.SerializeToUtf8Bytes(new ImageCheerRequest { SavedImageId = 1, Cheer = true }));

        var result = await api.CheerImage(new ImageCheerRequest { SavedImageId = 1, Cheer = true });
        Assert.True(result.success);

        // One row, tied to image 1 only - the old code matched on the player
        // alone, so this cheer would have clobbered cheers on every other image.
        var interactions = await db.ImageInteractions.ToListAsync();
        var interaction = Assert.Single(interactions);
        Assert.Equal(1, interaction.SavedImageId);
        Assert.True(interaction.IsCheered);

        // Cheering image 2 now adds a second row rather than stealing the first.
        api.ControllerContext.HttpContext.Request.Body =
            new MemoryStream(JsonSerializer.SerializeToUtf8Bytes(new ImageCheerRequest { SavedImageId = 2, Cheer = true }));
        await api.CheerImage(new ImageCheerRequest { SavedImageId = 2, Cheer = true });

        var all = await db.ImageInteractions.ToListAsync();
        Assert.Equal(2, all.Count);
        Assert.Contains(all, x => x.SavedImageId == 1 && x.IsCheered);
        Assert.Contains(all, x => x.SavedImageId == 2 && x.IsCheered);
    }

    [Fact]
    public async Task CheerLookup_ReportsCallerStateInRequestOrder()
    {
        using var db = CreateDb();
        db.Images.AddRange(
            Photo(1, CallerId, SavedImageAccessibility.Public, SavedImageType.ShareCamera),
            Photo(2, CallerId, SavedImageAccessibility.Public, SavedImageType.ShareCamera));
        db.ImageInteractions.Add(new CheeredImage { SavedImageId = 2, PlayerId = CallerId, IsCheered = true });
        await db.SaveChangesAsync();

        var api = CreateController<RadicadeServer.API.ImagesAPI>(db);
        var result = await api.GetBulkImageCheers(new long[] { 1, 2 });

        Assert.Equal(2, result.Count);
        var first = Assert.IsType<long>(result[0].GetType().GetProperty("SavedImageId")!.GetValue(result[0]));
        Assert.Equal(1, first);
        Assert.False((bool)result[0].GetType().GetProperty("IsCheered")!.GetValue(result[0])!);
        Assert.True((bool)result[1].GetType().GetProperty("IsCheered")!.GetValue(result[1])!);
    }

    [Fact]
    public async Task PlayerFeed_IncludesTaggedPhotos()
    {
        using var db = CreateDb();
        db.Images.AddRange(
            Photo(1, OtherId, SavedImageAccessibility.Public, SavedImageType.ShareCamera, tags: "[42]"),
            Photo(2, OtherId, SavedImageAccessibility.Public, SavedImageType.ShareCamera, tags: "[99]"),
            Photo(3, CallerId, SavedImageAccessibility.Public, SavedImageType.ShareCamera));
        await db.SaveChangesAsync();

        var api = CreateController<RadicadeServer.API.ImagesAPI>(db);
        var feed = await api.GetPlayerFeed(CallerId);

        Assert.Equal(2, feed.Count); // own photo + tagged photo, not the other tag
    }

    // ---- relationships -------------------------------------------------------

    [Fact]
    public async Task RelationshipWireShape_UsesPlayerID()
    {
        using var db = CreateDb();
        db.Relationships.Add(new RealRelationship
        {
            AccountId = CallerId,
            PlayerId = OtherId,
            RelationshipType = RelationshipType.Friend,
            Favorited = ReciprocalStatus.Local
        });
        await db.SaveChangesAsync();

        var api = CreateController<RelationshipsV2>(db);
        var relationships = await api.GetRelationships();

        var relationship = Assert.Single(relationships);
        var json = JsonSerializer.Serialize(relationship);
        using var doc = JsonDocument.Parse(json);
        var root = doc.RootElement;

        // The captured real RecNet shape: { Id, PlayerID, RelationshipType, ... }.
        // The old PlayerId spelling failed to bind on the client, blanking the
        // friends list.
        Assert.True(root.TryGetProperty("PlayerID", out var playerId));
        Assert.Equal(OtherId, playerId.GetInt64());
        Assert.True(root.TryGetProperty("Id", out _));
        Assert.Equal(3, root.GetProperty("RelationshipType").GetInt32());
        Assert.False(root.TryGetProperty("PlayerId", out _));
    }

    [Fact]
    public async Task SendThenAcceptFriendRequest_BefriendsBothSides()
    {
        using var db = CreateDb();

        var sender = CreateController<RelationshipsV2>(db, CallerId);
        await sender.SendFriendRequest(OtherId);

        var senderRel = await db.Relationships.SingleAsync(x => x.AccountId == CallerId && x.PlayerId == OtherId);
        var receiverRel = await db.Relationships.SingleAsync(x => x.AccountId == OtherId && x.PlayerId == CallerId);
        Assert.Equal(RelationshipType.FriendRequestSent, senderRel.RelationshipType);
        Assert.Equal(RelationshipType.FriendRequestReceived, receiverRel.RelationshipType);

        // A third party cannot accept a request addressed to someone else.
        var stranger = CreateController<RelationshipsV2>(db, 999);
        await stranger.AcceptFriendRequest(CallerId);
        receiverRel = await db.Relationships.SingleAsync(x => x.AccountId == OtherId && x.PlayerId == CallerId);
        Assert.Equal(RelationshipType.FriendRequestReceived, receiverRel.RelationshipType);

        // The actual receiver accepts: both sides flip to Friend.
        var receiver = CreateController<RelationshipsV2>(db, OtherId);
        await receiver.AcceptFriendRequest(CallerId);

        senderRel = await db.Relationships.SingleAsync(x => x.AccountId == CallerId && x.PlayerId == OtherId);
        receiverRel = await db.Relationships.SingleAsync(x => x.AccountId == OtherId && x.PlayerId == CallerId);
        Assert.Equal(RelationshipType.Friend, senderRel.RelationshipType);
        Assert.Equal(RelationshipType.Friend, receiverRel.RelationshipType);
    }

    [Fact]
    public async Task AcceptWithoutPendingRequest_DoesNothing()
    {
        using var db = CreateDb();
        var receiver = CreateController<RelationshipsV2>(db, OtherId);
        await receiver.AcceptFriendRequest(CallerId);

        // No rows were created at all: accepting out of the blue is a no-op,
        // not a silent friendship.
        Assert.Empty(await db.Relationships.ToListAsync());
    }

    [Fact]
    public async Task RemoveFriend_ClearsBothSides()
    {
        using var db = CreateDb();
        db.Relationships.AddRange(
            new RealRelationship { AccountId = CallerId, PlayerId = OtherId, RelationshipType = RelationshipType.Friend },
            new RealRelationship { AccountId = OtherId, PlayerId = CallerId, RelationshipType = RelationshipType.Friend });
        await db.SaveChangesAsync();

        var api = CreateController<RelationshipsV2>(db);
        await api.RemoveFriend(OtherId);

        Assert.All(await db.Relationships.ToListAsync(),
            x => Assert.Equal(RelationshipType.None, x.RelationshipType));
    }

    [Fact]
    public async Task FriendsList_OnlyServesAcceptedFriendships()
    {
        using var db = CreateDb();
        db.Relationships.AddRange(
            new RealRelationship { AccountId = CallerId, PlayerId = OtherId, RelationshipType = RelationshipType.Friend },
            new RealRelationship { AccountId = CallerId, PlayerId = 5, RelationshipType = RelationshipType.FriendRequestSent });
        await db.SaveChangesAsync();

        var api = CreateController<RelationshipsV2>(db);
        var friends = await api.GetFriends();

        var friend = Assert.Single(friends);
        Assert.Equal(OtherId, friend.PlayerID);
    }

    [Fact]
    public async Task RelationshipWith_ServesRowOrBareNone()
    {
        using var db = CreateDb();
        var api = CreateController<RelationshipsV1>(db);

        // No history yet: a bare None projection, not an error.
        var result = await api.RelationshipWith(OtherId);
        var ok = Assert.IsType<OkObjectResult>(result);
        using var noneDoc = JsonDocument.Parse(JsonSerializer.Serialize(ok.Value));
        Assert.Equal(0, noneDoc.RootElement.GetProperty("RelationshipType").GetInt32());
        Assert.Equal(OtherId, noneDoc.RootElement.GetProperty("PlayerID").GetInt64());

        db.Relationships.Add(new RealRelationship
        {
            AccountId = CallerId,
            PlayerId = OtherId,
            RelationshipType = RelationshipType.Friend
        });
        await db.SaveChangesAsync();

        var friendResult = await api.RelationshipWith(OtherId);
        var ok2 = Assert.IsType<OkObjectResult>(friendResult);
        using var friendDoc = JsonDocument.Parse(JsonSerializer.Serialize(ok2.Value));
        Assert.Equal(OtherId, friendDoc.RootElement.GetProperty("PlayerID").GetInt64());
        Assert.Equal(3, friendDoc.RootElement.GetProperty("RelationshipType").GetInt32());
    }

    // ---- photo tagging ---------------------------------------------------

    [Fact]
    public async Task PhotoTaggingSetting_RoundTrips()
    {
        using var db = CreateDb();
        var api = CreateController<RadicadeServer.API.Players.V1.PlayersV1>(db);

        // Unset reads 0 as a bare integer.
        var initial = await api.GetPhotoTaggingSetting();
        var initialOk = Assert.IsType<OkObjectResult>(initial);
        Assert.Equal(0, initialOk.Value);

        // Write 2 through a JSON body, then read it back.
        api.ControllerContext.HttpContext.Request.ContentType = "application/json";
        api.ControllerContext.HttpContext.Request.Body =
            new MemoryStream(JsonSerializer.SerializeToUtf8Bytes(new { Setting = 2 }));
        var written = await api.SetPhotoTaggingSetting();
        Assert.Equal(2, Assert.IsType<OkObjectResult>(written).Value);

        api.ControllerContext.HttpContext.Request.Body = new MemoryStream();
        var read = await api.GetPhotoTaggingSetting();
        Assert.Equal(2, Assert.IsType<OkObjectResult>(read).Value);
    }
}