using System.Reflection;
using System.Security.Claims;
using System.Text;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Migrations;
using Microsoft.EntityFrameworkCore.Migrations.Operations;
using Microsoft.Extensions.Logging.Abstractions;
using RadicadeServer.Admin;
using RadicadeServer.API.Compatibility;
using RadicadeServer.DB;
using RadicadeServer.Migrations;
using RadicadeServer.RecNet.Rooms;
using Xunit;

namespace RadicadeServer.Tests;

/// <summary>
/// Room comments (<c>POST roomcomments/comments/create/{roomId}</c>).
///
/// The route answered 200 and stored nothing - the client considers the comment posted, drops the
/// draft, and the comment is gone on reload. Silent, and indistinguishable from the room page
/// being broken. These cover the three things that make a stored comment real: the route the
/// client actually builds, a row with the caller as its author, and a table that a migration
/// creates.
/// </summary>
public class RoomCommentTests
{
    private static RecDBContext NewDb() => new(
        TestDbOptions.Create()
            .UseInMemoryDatabase(Guid.NewGuid().ToString())
            .Options);

    private static CompatibilityAPI NewApi(RecDBContext db, long? callerId = 205)
    {
        var identity = new ClaimsIdentity("TestAuth");
        if (callerId != null)
            identity.AddClaim(new Claim(ClaimTypes.NameIdentifier, callerId.Value.ToString()));

        return new CompatibilityAPI(db)
        {
            ControllerContext = new ControllerContext
            {
                HttpContext = new DefaultHttpContext { User = new ClaimsPrincipal(identity) }
            }
        };
    }

    private static void SetBody(ControllerBase controller, string body, string contentType)
    {
        var request = controller.ControllerContext.HttpContext.Request;
        request.ContentType = contentType;
        request.Body = new MemoryStream(Encoding.UTF8.GetBytes(body));
    }

    private static async Task<RecDBContext> WithRoomAsync(long roomId = 42)
    {
        var db = NewDb();
        db.Rooms.Add(new RoomData
        {
            RoomId = roomId,
            Name = "TestRoom",
            CreatorAccountId = 1,
            CreatedAt = DateTime.UtcNow
        });
        await db.SaveChangesAsync();
        return db;
    }

    // -----------------------------------------------------------------------------------
    // The route, and who is allowed to post
    // -----------------------------------------------------------------------------------

    [Fact]
    public void TheRouteIsTheClientsAbsolutePathAndRequiresAUser()
    {
        var method = typeof(CompatibilityAPI).GetMethod(nameof(CompatibilityAPI.CreateRoomComment))!;

        var template = Assert.Single(method.GetCustomAttributes<HttpPostAttribute>()).Template;
        Assert.Equal("/roomcomments/comments/create/{roomId:long}", template);

        // Absolute: a relative template would be concatenated onto the controller's own prefix and
        // answer a path no client asks for, which is this project's most repeated failure mode.
        Assert.StartsWith("/", template);

        // A comment has to have an author, and the author comes from the token.
        Assert.NotEmpty(method.GetCustomAttributes<AuthorizeAttribute>());
    }

    [Fact]
    public async Task AnAnonymousCommentIsRefusedRatherThanStoredUnderSomeone()
    {
        using var db = await WithRoomAsync();
        var api = NewApi(db, callerId: null);
        SetBody(api, """{"Comment":"hi"}""", "application/json");

        Assert.IsType<UnauthorizedObjectResult>(await api.CreateRoomComment(42));
        Assert.Empty(db.RoomComments);
    }

    // -----------------------------------------------------------------------------------
    // Storage
    // -----------------------------------------------------------------------------------

    [Fact]
    public async Task AJSONCommentIsStoredWithTheCallerAsItsAuthor()
    {
        using var db = await WithRoomAsync();
        var api = NewApi(db);
        SetBody(api, """{"Comment":"great room!","CommentType":"Feedback"}""", "application/json");

        Assert.IsType<OkObjectResult>(await api.CreateRoomComment(42));

        var comment = await db.RoomComments.SingleAsync();
        Assert.Equal(42, comment.RoomId);
        Assert.Equal(205, comment.CreatorAccountId);   // the caller, never a body field
        Assert.Equal("great room!", comment.Comment);
        Assert.Equal("Feedback", comment.CommentType);
        Assert.NotEqual(default, comment.CreatedAt);
    }

    [Fact]
    public async Task TheBodySpellingsTheClientMightUseAllLandInTheSameColumn()
    {
        using var db = await WithRoomAsync();
        var api = NewApi(db);
        // A single-field DTO serializes to a bare JSON string, which is not an object at all.
        SetBody(api, "\"bare string body\"", "application/json");

        Assert.IsType<OkObjectResult>(await api.CreateRoomComment(42));

        Assert.Equal("bare string body", (await db.RoomComments.SingleAsync()).Comment);
    }

    [Fact]
    public async Task AFormPostIsStoredToo()
    {
        using var db = await WithRoomAsync();
        var api = NewApi(db);
        SetBody(api, "Comment=form+comment&commentType=Report", "application/x-www-form-urlencoded");

        Assert.IsType<OkObjectResult>(await api.CreateRoomComment(42));

        var comment = await db.RoomComments.SingleAsync();
        Assert.Equal("form comment", comment.Comment);
        Assert.Equal("Report", comment.CommentType);
    }

    [Fact]
    public async Task ACommentSentInTheQueryStringIsStored()
    {
        using var db = await WithRoomAsync();
        var api = NewApi(db);

        // The client's own call carries the comment as a query parameter and posts no body at all,
        // which is why a real comment came back as "rejected: empty body" - only the body was read.
        api.ControllerContext.HttpContext.Request.QueryString = new QueryString("?comment=query%20comment");

        Assert.IsType<OkObjectResult>(await api.CreateRoomComment(42));

        Assert.Equal("query comment", (await db.RoomComments.SingleAsync()).Comment);
    }

    [Fact]
    public async Task AQueryStringCommentStillTakesItsTypeFromTheForm()
    {
        using var db = await WithRoomAsync();
        var api = NewApi(db);

        // Both carriers at once: whichever one names the text, the type must not be lost.
        api.ControllerContext.HttpContext.Request.QueryString = new QueryString("?comment=mixed");
        SetBody(api, "commentType=Report", "application/x-www-form-urlencoded");

        Assert.IsType<OkObjectResult>(await api.CreateRoomComment(42));

        var comment = await db.RoomComments.SingleAsync();
        Assert.Equal("mixed", comment.Comment);
        Assert.Equal("Report", comment.CommentType);
    }

    [Fact]
    public async Task AnEmptyCommentIsRefusedSoTheClientKeepsTheDraft()
    {
        using var db = await WithRoomAsync();
        var api = NewApi(db);
        SetBody(api, """{"Comment":"   "}""", "application/json");

        // Non-2xx on purpose: the client keeps what the player typed instead of dropping it.
        Assert.IsType<BadRequestObjectResult>(await api.CreateRoomComment(42));
        Assert.Empty(db.RoomComments);
    }

    [Fact]
    public async Task ACommentWithNoTypeFallsBackToTheClientsOwnDefault()
    {
        using var db = await WithRoomAsync();
        var api = NewApi(db);
        SetBody(api, """{"Comment":"no type"}""", "application/json");

        Assert.IsType<OkObjectResult>(await api.CreateRoomComment(42));

        Assert.Equal("Feedback", (await db.RoomComments.SingleAsync()).CommentType);
    }

    [Fact]
    public async Task ThePositionIsKeptWhenTheClientSendsOneAndNullWhenItDoesNot()
    {
        using var db = await WithRoomAsync();

        var withPosition = NewApi(db);
        SetBody(withPosition, """{"Comment":"here","Position":{"x":1.5,"y":2,"z":-3}}""", "application/json");
        Assert.IsType<OkObjectResult>(await withPosition.CreateRoomComment(42));

        var withoutPosition = NewApi(db);
        SetBody(withoutPosition, """{"Comment":"anywhere"}""", "application/json");
        Assert.IsType<OkObjectResult>(await withoutPosition.CreateRoomComment(42));

        var rows = await db.RoomComments.OrderBy(c => c.Id).ToListAsync();
        Assert.Equal(1.5f, rows[0].PositionX);
        Assert.Equal(2f, rows[0].PositionY);
        Assert.Equal(-3f, rows[0].PositionZ);
        Assert.Null(rows[1].PositionX);
    }

    // -----------------------------------------------------------------------------------
    // The table itself
    // -----------------------------------------------------------------------------------

    [Fact]
    public void TheCommentsTableIsInTheModelAndAMigrationCreatesIt()
    {
        using var db = NewDb();
        Assert.NotNull(db.RoomComments);

        // A DbSet with no migration is a column the running database never gets: the code compiles,
        // the query works in memory, and every insert fails on the server. Migrate() runs Up(), so
        // running it here is the same statement the server will execute.
        // Up() is protected (EF calls it itself), so it is invoked the way the framework does.
        var up = typeof(AddRoomComments).GetMethod("Up", BindingFlags.NonPublic | BindingFlags.Instance)!;
        var builder = new MigrationBuilder("Microsoft.EntityFrameworkCore.SqlServer");
        up.Invoke(new AddRoomComments(), new object[] { builder });

        var statements = builder.Operations
            .OfType<SqlOperation>()
            .Select(op => op.Sql)
            .ToArray();

        Assert.NotEmpty(statements);
        Assert.Contains(statements, op => op.Contains("CREATE TABLE", StringComparison.Ordinal));
        Assert.Contains(statements, op => op.Contains("[dbo].[RoomComments]", StringComparison.Ordinal));

        // Guarded, like every other hand-written migration here: a second run over a database that
        // already has the table is a no-op instead of a startup crash.
        Assert.Contains(statements, op => op.Contains("OBJECT_ID", StringComparison.Ordinal));
    }

    // -----------------------------------------------------------------------------------
    // The admin panel side
    // -----------------------------------------------------------------------------------


    // The panel's routes reject an unauthenticated caller - the branch's admin sign-in
    // guards every one of them with AdminUtils.IsAdminKey - so these tests act as a
    // signed-in operator by presenting the key the server has configured.
    private const string TestAdminKey = "test-admin-key";

    private static async Task<TResult> AsAdminAsync<TResult>(Func<Task<TResult>> call)
    {
        var original = DBConfig.AdminApiKey;
        DBConfig.AdminApiKey = TestAdminKey;
        try
        {
            return await call();
        }
        finally
        {
            DBConfig.AdminApiKey = original;
        }
    }

    [Fact]
    public async Task ThePanelListsWhatPlayersActuallyWrote()
    {
        using var db = await WithRoomAsync();

        var api = NewApi(db);
        SetBody(api, """{"Comment":"panel should see this"}""", "application/json");
        Assert.IsType<OkObjectResult>(await api.CreateRoomComment(42));

        var panel = new AdminPanelAPI(db);
        var ok = Assert.IsType<OkObjectResult>(await AsAdminAsync(() => panel.List("room_comments", TestAdminKey, null, null, null, true)));
        var json = System.Text.Json.JsonSerializer.SerializeToElement(ok.Value);

        var row = Assert.Single(json.EnumerateArray());
        Assert.Equal("panel should see this", row.GetProperty("comment").GetString());
        Assert.Equal(42, row.GetProperty("room_id").GetInt64());
        Assert.Equal(205, row.GetProperty("creator_account_id").GetInt64());
    }

    [Fact]
    public async Task ThePanelCanDeleteAComment()
    {
        using var db = await WithRoomAsync();

        var api = NewApi(db);
        SetBody(api, """{"Comment":"delete me"}""", "application/json");
        Assert.IsType<OkObjectResult>(await api.CreateRoomComment(42));
        var id = (await db.RoomComments.SingleAsync()).Id;

        var panel = new AdminPanelAPI(db);
        Assert.IsType<OkObjectResult>(await AsAdminAsync(() => panel.Delete("room_comments", TestAdminKey, null, id.ToString(), "id", id.ToString(), null, null, null)));

        Assert.Empty(db.RoomComments);
    }
}