using System.Security.Claims;
using System.Text.Json;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using RadicadeServer.Admin;
using RadicadeServer.API.Avatars.V2;
using RadicadeServer.DB;
using RadicadeServer.RecNet.Avatar;
using RadicadeServer.RecNet.Rooms;
using RadicadeServer.Utils;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// Who a room's join box is from. The box a player receives on joining already travelled with
/// RecNet's <c>Gift.FromPlayerId</c> - it is the field the client reads to put a name on the box -
/// but a room's join gift left it at zero, so every join box arrived from nobody.
///
/// The room's Room Details modal now carries a FromPlayerId, which lands in
/// <c>Rooms.JoinGiftFromPlayerId</c> and from there on the box. The value crosses a JSON boundary
/// twice, and an account id is eighteen digits, so the panel and the route keep it as digits in a
/// string rather than as a number: a JSON number is read back as a double and its last digits are
/// rounded away, which would name a different account.
///
/// These tests drive the real admin routes and then read the box the way a client does -
/// GET api/avatar/v2/gifts - rather than inspecting the row the route answered with.
[Collection(DbFactoryCollection.Name)]
public class RoomJoinGiftFromTests
{
    private const string Secret = "room-join-gift-from-key";
    private const long RoomId = 247;
    private const long Joiner = 114903603133502227;
    private const long Sender = 733901112234567890;

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

    /// <summary>A room that hands every player a box on join, which is what makes the sender matter.</summary>
    private static async Task<RecDBContext> RoomWithJoinGiftAsync()
    {
        var db = NewDb();
        db.Rooms.Add(new RoomData
        {
            RoomId = RoomId,
            Name = "RecCenter",
            CreatorAccountId = 1,
            JoinGiftEnabled = true,
            JoinGiftOncePerPlayer = true,
            JoinGiftTitle = "Room Visit Gift",
            JoinGiftMessage = "Thanks for visiting!",
            JoinGiftCurrencyType = RadicadeServer.RecNet.Enums.Store.CurrencyType.RecCenterTokens,
            JoinGiftCurrencyAmount = 25
        });
        await db.SaveChangesAsync();
        return db;
    }

    /// <summary>Patches one room the way the panel does, and returns the answer's status.</summary>
    private static async Task<IActionResult> SaveRoomAsync(RecDBContext db, string payloadJson)
    {
        var api = new AdminPanelAPI(db);
        var originalKey = DBConfig.AdminApiKey;
        DBConfig.AdminApiKey = Secret;
        try
        {
            var payload = JsonDocument.Parse(payloadJson).RootElement;
            return await api.Update("rooms", RoomId, Secret, payload);
        }
        finally
        {
            DBConfig.AdminApiKey = originalKey;
        }
    }

    /// <summary>The box as the recipient's client reads it: GET api/avatar/v2/gifts.</summary>
    private static async Task<List<Gift>> ClientGiftsAsync(RecDBContext db, long playerId)
    {
        var api = new AvatarV2(db)
        {
            ControllerContext = new ControllerContext
            {
                HttpContext = new DefaultHttpContext
                {
                    User = new ClaimsPrincipal(new ClaimsIdentity(
                        [new Claim(ClaimTypes.NameIdentifier, playerId.ToString())], "test"))
                }
            }
        };

        var result = await api.GetGifts();
        var ok = Assert.IsType<OkObjectResult>(result);
        return Assert.IsAssignableFrom<IEnumerable<Gift>>(ok.Value).ToList();
    }

    /// <summary>The one box the joiner's client reads, with the server's own naming on the wire.</summary>
    private static async Task<JsonElement> JoinerBoxOnTheWireAsync(RecDBContext db)
    {
        Assert.True(await RoomJoinGiftUtils.TryDeliverAsync(db, Joiner, RoomId));

        var read = Assert.Single(await ClientGiftsAsync(db, Joiner));
        return JsonDocument.Parse(JsonSerializer.Serialize(read)).RootElement;
    }

    [Fact]
    public async Task TheSenderThePanelSavesIsTheSenderOnTheJoinBox()
    {
        var db = await RoomWithJoinGiftAsync();

        var result = await SaveRoomAsync(db, $$"""
        {
          "join_gift_from_player_id": "{{Sender}}",
          "join_gift_title": "Room Visit Gift"
        }
        """);
        Assert.IsType<OkObjectResult>(result);

        var stored = await db.Rooms.SingleAsync(x => x.RoomId == RoomId);
        Assert.Equal(Sender, stored.JoinGiftFromPlayerId);

        // And what the joiner's client reads off the box it was handed.
        var wire = await JoinerBoxOnTheWireAsync(db);
        Assert.Equal(Sender, wire.GetProperty("FromPlayerId").GetInt64());
    }

    [Fact]
    public async Task ASeventeenDigitSenderIsNotRoundedOnItsWayThroughThePanel()
    {
        var db = await RoomWithJoinGiftAsync();
        Assert.True(Sender > int.MaxValue);

        await SaveRoomAsync(db, $$"""
        { "join_gift_from_player_id": "{{Sender}}" }
        """);

        // The panel reads the id back as digits in a string, so the modal shows the digits that
        // were saved rather than a rounded double, and saving again cannot drift the account.
        var api = new AdminPanelAPI(db);
        var originalKey = DBConfig.AdminApiKey;
        DBConfig.AdminApiKey = Secret;
        string? asPanelReadsIt;
        try
        {
            var details = Assert.IsType<OkObjectResult>(await api.RoomPanelDetails(RoomId, Secret));
            using var doc = JsonDocument.Parse(JsonSerializer.Serialize(details.Value));
            var field = doc.RootElement.GetProperty("room").GetProperty("join_gift_from_player_id");
            Assert.Equal(JsonValueKind.String, field.ValueKind);
            asPanelReadsIt = field.GetString();
        }
        finally
        {
            DBConfig.AdminApiKey = originalKey;
        }

        Assert.Equal(Sender.ToString(), asPanelReadsIt);
    }

    [Fact]
    public async Task AChangedSenderReissuesTheBox()
    {
        var db = await RoomWithJoinGiftAsync();
        var before = (await db.Rooms.SingleAsync(x => x.RoomId == RoomId)).JoinGiftVersion;

        await SaveRoomAsync(db, $$"""
        { "join_gift_from_player_id": "{{Sender}}" }
        """);

        // A new version means a new gift drop id, so a player who already opened the old box is
        // handed the one that now names a sender.
        var after = await db.Rooms.SingleAsync(x => x.RoomId == RoomId);
        Assert.True(after.JoinGiftVersion > before);
    }

    [Fact]
    public async Task ASaveThatLeavesTheSenderAloneDoesNotReissueTheBox()
    {
        var db = await RoomWithJoinGiftAsync();
        await SaveRoomAsync(db, $$"""
        { "join_gift_from_player_id": "{{Sender}}" }
        """);
        var afterFirstSave = (await db.Rooms.SingleAsync(x => x.RoomId == RoomId)).JoinGiftVersion;

        // The same id again - the modal posts every field on every save.
        await SaveRoomAsync(db, $$"""
        { "join_gift_from_player_id": "{{Sender}}", "join_gift_enabled": true, "join_gift_once_per_player": true }
        """);

        var again = await db.Rooms.SingleAsync(x => x.RoomId == RoomId);
        Assert.Equal(afterFirstSave, again.JoinGiftVersion);
        Assert.Equal(Sender, again.JoinGiftFromPlayerId);
    }

    [Fact]
    public async Task AClearedSenderLeavesTheBoxWithNoSender()
    {
        var db = await RoomWithJoinGiftAsync();
        await SaveRoomAsync(db, $$"""
        { "join_gift_from_player_id": "{{Sender}}" }
        """);

        // The blank field is what the modal sends for no sender, and it has to clear the room
        // rather than leave the old account on the box.
        Assert.IsType<OkObjectResult>(await SaveRoomAsync(db, """{ "join_gift_from_player_id": "" }"""));

        Assert.Equal(0, (await db.Rooms.SingleAsync(x => x.RoomId == RoomId)).JoinGiftFromPlayerId);

        var wire = await JoinerBoxOnTheWireAsync(db);
        Assert.Equal(0, wire.GetProperty("FromPlayerId").GetInt64());
    }

    [Fact]
    public async Task ARoomNoPanelFieldArrivedForKeepsItsSender()
    {
        var db = await RoomWithJoinGiftAsync();
        await SaveRoomAsync(db, $$"""
        { "join_gift_from_player_id": "{{Sender}}" }
        """);

        // An older panel, an import or a partial save leaves the field out entirely; that is not
        // a request to clear it.
        Assert.IsType<OkObjectResult>(await SaveRoomAsync(db, """{ "min_level": 5 }"""));

        Assert.Equal(Sender, (await db.Rooms.SingleAsync(x => x.RoomId == RoomId)).JoinGiftFromPlayerId);
    }

    [Fact]
    public async Task ASenderThatIsNotAnAccountIdIsRefusedRatherThanKept()
    {
        var db = await RoomWithJoinGiftAsync();
        await SaveRoomAsync(db, $$"""
        { "join_gift_from_player_id": "{{Sender}}" }
        """);

        // The panel refuses this before it posts; if it ever reaches the route anyway, the room
        // must not be left believing the sender changed.
        var result = await SaveRoomAsync(db, """{ "join_gift_from_player_id": "not-a-player" }""");

        var bad = Assert.IsType<BadRequestObjectResult>(result);
        Assert.Contains("join_gift_from_player_id", bad.Value?.ToString());
        Assert.Equal(Sender, (await db.Rooms.SingleAsync(x => x.RoomId == RoomId)).JoinGiftFromPlayerId);
    }

    [Fact]
    public async Task ARoomThatNamesNoSenderStillHandsOutItsBox()
    {
        var db = await RoomWithJoinGiftAsync();

        // Nothing here sets a sender: the box is still delivered, it just names nobody, which is
        // how every join box behaved before the room could name a sender.
        var wire = await JoinerBoxOnTheWireAsync(db);

        Assert.Equal(0, wire.GetProperty("FromPlayerId").GetInt64());
        Assert.Equal(25, wire.GetProperty("Currency").GetInt32());
    }
}