using System.Security.Claims;
using System.Text;
using System.Text.Json;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging.Abstractions;
using RadicadeServer.API.Moderation;
using RadicadeServer.API.Relationships.V1;
using RadicadeServer.DB;
using RadicadeServer.Extensions;
using RadicadeServer.RecNet.Auth;
using RadicadeServer.RecNet.Moderation;
using RadicadeServer.RecNet.Progression;
using RadicadeServer.RecNet.Relationships;
using RadicadeServer.Utils;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// Two routes the client calls that never reached a handler (a 404 and a 400), plus the
/// time-in-room XP rules: public rooms only, 10 XP every 5 minutes, 60 per room, 150 per day.
/// </summary>
[Collection(DbFactoryCollection.Name)]
public class ProgressionAndReportingRouteTests
{
    private const long CallerId = 42;
    private const long OtherId = 77;

    private static RecDBContext CreateDb() => new(
        TestDbOptions.Create()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .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 = typeof(T) == typeof(PlayerReportingAPI)
            ? (T)(object)new PlayerReportingAPI(db)
            : (T)Activator.CreateInstance(typeof(T), db)!;

        controller.ControllerContext = new ControllerContext
        {
            HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal(identity) }
        };
        return controller;
    }

    private static void SetJsonBody(Controller controller, string jsonBody)
    {
        var bytes = Encoding.UTF8.GetBytes(jsonBody);
        controller.HttpContext.Request.Body = new MemoryStream(bytes);
        controller.HttpContext.Request.ContentType = "application/json";
        controller.HttpContext.Request.ContentLength = bytes.Length;
    }

    // ---- POST api/relationships/sendfriendintroductions -> 404 ------------------------------

    [Fact]
    public void SendFriendIntroductionsIsRegisteredOnTheUnversionedPath()
    {
        var attributes = typeof(RelationshipsV1).GetMethod(nameof(RelationshipsV1.SendFriendIntroductions))!
            .GetCustomAttributes(typeof(Microsoft.AspNetCore.Mvc.Routing.HttpMethodAttribute), true)
            .Cast<Microsoft.AspNetCore.Mvc.Routing.HttpMethodAttribute>()
            .ToList();

        Assert.Contains(attributes, a => a.HttpMethods.Contains("POST"));
        // The client asks for `api/relationships/sendfriendintroductions`, with no version
        // segment - that is the spelling that 404ed.
        Assert.Contains(attributes, a => (a.Template ?? "").EndsWith("api/relationships/sendfriendintroductions"));
    }

    [Fact]
    public async Task SendFriendIntroductionsAnswersTheSharedSuccessShape()
    {
        using var db = CreateDb();
        var controller = CreateController<RelationshipsV1>(db);
        SetJsonBody(controller, JsonSerializer.Serialize(new { toPlayerIds = new[] { OtherId }, aboutPlayerId = CallerId }));

        var result = Assert.IsType<OkObjectResult>(await controller.SendFriendIntroductions());

        // The client's wrapper returns ONE object of the same success type the PlayerReporting
        // routes answer with; an array of relationships is a Malformed Response to it (which is
        // exactly what the caller logged before this route was corrected).
        var ok = Assert.IsType<OkResponse>(result.Value);
        Assert.True(ok.Success);
    }

    [Fact]
    public async Task SendFriendIntroductionsReadsTheIdsFromTheQueryToo()
    {
        using var db = CreateDb();
        var controller = CreateController<RelationshipsV1>(db);
        // The ids may arrive in the query rather than the body; the route must still answer its
        // success object instead of throwing on an empty body.
        controller.HttpContext.Request.QueryString = new QueryString($"?toPlayerIds={OtherId}&aboutPlayerId={CallerId}");

        var result = Assert.IsType<OkObjectResult>(await controller.SendFriendIntroductions());
        Assert.True(Assert.IsType<OkResponse>(result.Value).Success);
    }

    [Fact]
    public async Task SendFriendIntroductionsToleratesJunkIds()
    {
        using var db = CreateDb();
        var controller = CreateController<RelationshipsV1>(db);
        // A caller, a non-numeric entry and a real target must not throw: the route answers its
        // success object whatever the body contains.
        SetJsonBody(controller,
            JsonSerializer.Serialize(new { toPlayerIds = new object[] { CallerId, "not-a-number", OtherId } }));

        var result = Assert.IsType<OkObjectResult>(await controller.SendFriendIntroductions());
        Assert.True(Assert.IsType<OkResponse>(result.Value).Success);
    }

    // ---- POST api/PlayerReporting/v1/instantKick -> 400 ------------------------------------

    private static async Task<RecDBContext> WithTargetAsync(long targetId)
    {
        var db = CreateDb();
        db.Profiles.Add(new Profile
        {
            accountId = targetId,
            username = $"player{targetId}",
            displayName = $"Player {targetId}",
            profileImage = DBConfig.DefaultProfileImage
        });
        await db.SaveChangesAsync();
        return db;
    }

    /// <summary>Unwraps the OkResponse action result and asserts it is a 200.</summary>
    private static async Task AssertOkAsync(Task<ActionResult<OkResponse>> call)
    {
        var result = await call;
        Assert.IsType<OkObjectResult>(result.Result);
    }

    private static async Task AssertKickedAsync(RecDBContext db, long targetId)
    {
        var moderation = await db.Moderation.SingleAsync(x => x.PlayerId == targetId);
        Assert.True(moderation.IsBan);
    }

    [Fact]
    public async Task InstantKickAcceptsTheTargetFromTheBody()
    {
        using var db = await WithTargetAsync(OtherId);
        var controller = CreateController<PlayerReportingAPI>(db);
        SetJsonBody(controller,
            JsonSerializer.Serialize(new { PlayerId = OtherId, GameSessionId = 7, Reason = "Cheating" }));

        await AssertOkAsync(controller.InstantKick());
        await AssertKickedAsync(db, OtherId);
    }

    [Fact]
    public async Task InstantKickAcceptsTheTargetFromTheQueryString()
    {
        using var db = await WithTargetAsync(OtherId);
        var controller = CreateController<PlayerReportingAPI>(db);
        controller.HttpContext.Request.QueryString = new QueryString($"?playerId={OtherId}");

        // No body at all: the id is only in the query. Binding used to look at the body alone,
        // which made this a 400 ("Missing player id") for a request that named its target.
        await AssertOkAsync(controller.InstantKick());
        await AssertKickedAsync(db, OtherId);
    }

    [Fact]
    public async Task InstantKickAcceptsABareIdBody()
    {
        using var db = await WithTargetAsync(OtherId);
        var controller = CreateController<PlayerReportingAPI>(db);
        SetJsonBody(controller, OtherId.ToString());

        await AssertOkAsync(controller.InstantKick());
        await AssertKickedAsync(db, OtherId);
    }

    [Fact]
    public async Task InstantKickFindsAPlayerNamedFieldUnderAnyName()
    {
        using var db = await WithTargetAsync(OtherId);
        var controller = CreateController<PlayerReportingAPI>(db);
        // The client's own DTO has changed its field name between builds; anything that names a
        // player still resolves.
        SetJsonBody(controller, JsonSerializer.Serialize(new { request = new { kickedPlayerId = OtherId } }));

        await AssertOkAsync(controller.InstantKick());
        await AssertKickedAsync(db, OtherId);
    }

    [Fact]
    public async Task InstantKickStillRefusesARequestThatNamesNobody()
    {
        using var db = await WithTargetAsync(OtherId);
        var controller = CreateController<PlayerReportingAPI>(db);
        SetJsonBody(controller, """{"Reason":"no target here"}""");

        var result = await controller.InstantKick();
        Assert.IsType<BadRequestObjectResult>(result.Result);
        Assert.Empty(await db.Moderation.ToListAsync());
    }

    // ---- room XP rules ----------------------------------------------------------------------

    private const long PublicRoomId = 101;
    private const long OtherPublicRoomId = 102;

    private static async Task<ProgressionData> SeedProgressAsync(RecDBContext db, long playerId)
    {
        var progression = new ProgressionData { PlayerId = playerId };
        db.Progression.Add(progression);
        await db.SaveChangesAsync();
        return progression;
    }

    /// <summary>Moves the room's last payout back in time so the next call sees a full interval.</summary>
    private static async Task RewindRoomClockAsync(RecDBContext db, long playerId, TimeSpan by)
    {
        var progression = await db.Progression.SingleAsync(x => x.PlayerId == playerId);
        var json = progression.GetProgressionJson()!;
        json.RoomXpLastGrantAt = (json.RoomXpLastGrantAt ?? DateTime.UtcNow).Subtract(by);
        progression.Progress = json.ToJson();
        await db.SaveChangesAsync();
    }

    private static async Task<int> AwardAsync(RecDBContext db, long playerId, long roomId, bool isPublic = true)
        => await RoomProgressionService.AwardRoomXpAsync(db, playerId, roomId, isPublic);

    [Fact]
    public async Task EnteringARoomPaysNothingUntilAnIntervalHasPassed()
    {
        using var db = CreateDb();
        var progression = await SeedProgressAsync(db, CallerId);

        // Arrival anchors the session and starts the clock.
        Assert.Equal(0, await AwardAsync(db, CallerId, PublicRoomId));
        Assert.Equal(0, progression.XP);

        await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
        Assert.Equal(10, await AwardAsync(db, CallerId, PublicRoomId));

        var json = progression.GetProgressionJson()!;
        Assert.Equal(10, json.RoomXpEarned);
        Assert.Equal(10, json.XpEarnedToday);
        Assert.Equal(10, progression.XP);
    }

    [Fact]
    public async Task APrivateRoomNeverPays()
    {
        using var db = CreateDb();
        var progression = await SeedProgressAsync(db, CallerId);

        Assert.Equal(0, await AwardAsync(db, CallerId, PublicRoomId, isPublic: false));
        await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
        Assert.Equal(0, await AwardAsync(db, CallerId, PublicRoomId, isPublic: false));

        Assert.Equal(0, progression.XP);
    }

    [Fact]
    public async Task OneRoomStopsPayingOnceItHasGivenSixtyXp()
    {
        using var db = CreateDb();
        var progression = await SeedProgressAsync(db, CallerId);

        Assert.Equal(0, await AwardAsync(db, CallerId, PublicRoomId));
        for (var i = 0; i < 6; i++)
        {
            await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
            Assert.Equal(10, await AwardAsync(db, CallerId, PublicRoomId));
        }

        // 60 XP is the room's ceiling: further intervals in the same room pay nothing...
        await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(10));
        Assert.Equal(0, await AwardAsync(db, CallerId, PublicRoomId));
        Assert.Equal(60, progression.XP);

        // ...but moving to another room starts a fresh session.
        Assert.Equal(0, await AwardAsync(db, CallerId, OtherPublicRoomId));
        await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
        Assert.Equal(10, await AwardAsync(db, CallerId, OtherPublicRoomId));
        Assert.Equal(70, progression.XP);

        var json = progression.GetProgressionJson()!;
        Assert.Equal(OtherPublicRoomId, json.RoomXpRoomId);
        Assert.Equal(10, json.RoomXpEarned);
    }

    [Fact]
    public async Task TheDailyCeilingStopsPayoutForTwentyFourHours()
    {
        using var db = CreateDb();
        var progression = await SeedProgressAsync(db, CallerId);

        // Start the player two full rooms away from the daily ceiling: 60 + 60 = 120, then the
        // third room can only pay the remaining 30 - three instalments of 10.
        Assert.Equal(0, await AwardAsync(db, CallerId, PublicRoomId));
        for (var i = 0; i < 6; i++)
        {
            await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
            await AwardAsync(db, CallerId, PublicRoomId);
        }

        Assert.Equal(0, await AwardAsync(db, CallerId, OtherPublicRoomId));
        for (var i = 0; i < 6; i++)
        {
            await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
            await AwardAsync(db, CallerId, OtherPublicRoomId);
        }
        Assert.Equal(120, progression.XP);

        // A third room can pay only 30 more before the daily ceiling: 120 + 30 = 150.
        const long thirdRoom = 103;
        Assert.Equal(0, await AwardAsync(db, CallerId, thirdRoom));
        for (var i = 0; i < 3; i++)
        {
            await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
            Assert.Equal(10, await AwardAsync(db, CallerId, thirdRoom));
        }

        // The ceiling lands on exactly 150, which is what starts the 24 hour wait.
        Assert.Equal(150, progression.XP);

        // The next interval would take the player past 150, so the ceiling holds at 150.
        await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
        Assert.Equal(0, await AwardAsync(db, CallerId, thirdRoom));
        Assert.Equal(150, progression.XP);

        var json = progression.GetProgressionJson()!;
        Assert.Equal(150, json.XpEarnedToday);
        Assert.NotNull(json.XpDailyCapReachedAt);
    }

    [Fact]
    public async Task ReachingTheDailyCeilingLocksPayoutForTheNextTwentyFourHours()
    {
        using var db = CreateDb();
        var progression = await SeedProgressAsync(db, CallerId);

        // Put the player one instalment from the ceiling, mid-session. Only 5 XP is left under
        // it, so that instalment pays the remainder rather than a whole 10.
        var json = progression.GetProgressionJson()!;
        json.XpEarnedToday = 145;
        json.XpEarnedTodayDate = DateTime.UtcNow.Date;
        json.RoomXpRoomId = PublicRoomId;
        json.RoomXpEarned = 20;
        json.RoomXpLastGrantAt = DateTime.UtcNow.Subtract(TimeSpan.FromMinutes(5));
        progression.Progress = json.ToJson();
        await db.SaveChangesAsync();

        Assert.Equal(5, await AwardAsync(db, CallerId, PublicRoomId));
        json = progression.GetProgressionJson()!;
        Assert.Equal(150, json.XpEarnedToday);
        Assert.NotNull(json.XpDailyCapReachedAt);

        // Within the 24 hour wait the room cannot pay, however long the player stays.
        await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(30));
        Assert.Equal(0, await AwardAsync(db, CallerId, PublicRoomId));
        Assert.Equal(5, progression.XP);

        // Moving to another room does not help - the ceiling is per player, not per room.
        Assert.Equal(0, await AwardAsync(db, CallerId, OtherPublicRoomId));
        await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
        Assert.Equal(0, await AwardAsync(db, CallerId, OtherPublicRoomId));

        // Once the 24 hours are up, earnings resume.
        json = progression.GetProgressionJson()!;
        json.XpEarnedTodayDate = DateTime.UtcNow.Date;
        json.XpDailyCapReachedAt = DateTime.UtcNow.Subtract(TimeSpan.FromHours(25));
        json.RoomXpRoomId = OtherPublicRoomId;
        json.RoomXpEarned = 0;
        json.RoomXpLastGrantAt = DateTime.UtcNow.Subtract(TimeSpan.FromMinutes(5));
        progression.Progress = json.ToJson();
        await db.SaveChangesAsync();

        Assert.Equal(10, await AwardAsync(db, CallerId, OtherPublicRoomId));
        Assert.Equal(15, progression.XP);
    }

    [Fact]
    public async Task LevellingUpRaisesTheStoredLevelWithoutGiftRows()
    {
        using var db = CreateDb();
        var progression = await SeedProgressAsync(db, CallerId);

        // Six intervals of 10 fill the room to its 60 XP ceiling, which the shipped map puts at
        // level 4 (thresholds 10/20/30/50/70). There are no GiftItems rows in this database, and
        // the level must still move - a missing reward row cannot freeze progression.
        Assert.Equal(0, await AwardAsync(db, CallerId, PublicRoomId));
        for (var i = 0; i < 6; i++)
        {
            await RewindRoomClockAsync(db, CallerId, TimeSpan.FromMinutes(5));
            Assert.Equal(10, await AwardAsync(db, CallerId, PublicRoomId));
        }

        Assert.Equal(60, progression.XP);
        Assert.Equal(4, progression.Level);
    }

    [Fact]
    public async Task TheLeveledUpPlayerIsPushedToTheClientWithoutRelogging()
    {
        using var db = CreateDb();
        await SeedProgressAsync(db, CallerId);
        db.Players.Add(new PlayerData { AccountId = CallerId, Hashword = "x" });
        db.Profiles.Add(new Profile
        {
            accountId = CallerId,
            username = "tester",
            displayName = "Tester",
            profileImage = DBConfig.DefaultProfileImage
        });
        await db.SaveChangesAsync();

        // The push is best effort and must not throw when there is no connected client - what it
        // must not do is leave the level change to be noticed at the next login.
        await RoomProgressionService.PushProgressionUpdateAsync(db, CallerId);
    }

    [Fact]
    public async Task RoomXpIsRejectedForAnUnknownPlayerAndRoom()
    {
        using var db = CreateDb();
        Assert.Equal(0, await RoomProgressionService.AwardRoomXpAsync(db, 0, PublicRoomId, true));
        Assert.Equal(0, await RoomProgressionService.AwardRoomXpAsync(db, CallerId, 0, true));
    }
}