using System.Buffers.Binary;
using AcDream.Core.Net.Messages;

namespace AcDream.Core.Net.Tests.Messages;

public sealed class ClientCommandRequestsTests
{
    public static TheoryData<Func<uint, byte[]>, uint> ParameterlessActions => new()
    {
        { ClientCommandRequests.BuildMarketplace, ClientCommandRequests.MarketplaceOpcode },
        { ClientCommandRequests.BuildPkArena, ClientCommandRequests.PkArenaOpcode },
        { ClientCommandRequests.BuildPkLiteArena, ClientCommandRequests.PkLiteArenaOpcode },
        { ClientCommandRequests.BuildHouseRecall, ClientCommandRequests.HouseRecallOpcode },
        { ClientCommandRequests.BuildMansionRecall, ClientCommandRequests.MansionRecallOpcode },
        { ClientCommandRequests.BuildSuicide, ClientCommandRequests.SuicideOpcode },
        { ClientCommandRequests.BuildClearFriends, ClientCommandRequests.ClearFriendsOpcode },
        { ClientCommandRequests.BuildClearConsent, ClientCommandRequests.ClearConsentOpcode },
        { ClientCommandRequests.BuildDisplayConsent, ClientCommandRequests.DisplayConsentOpcode },
    };

    [Theory]
    [MemberData(nameof(ParameterlessActions))]
    public void ParameterlessAction_MatchesRetailEnvelope(
        Func<uint, byte[]> build, uint opcode)
    {
        byte[] body = build(0x1234u);

        Assert.Equal(12, body.Length);
        Assert.Equal(InteractRequests.GameActionEnvelope, Read(body, 0));
        Assert.Equal(0x1234u, Read(body, 4));
        Assert.Equal(opcode, Read(body, 8));
    }

    [Theory]
    [InlineData(false, ClientCommandRequests.QueryAgeOpcode)]
    [InlineData(true, ClientCommandRequests.QueryBirthOpcode)]
    public void CharacterQuery_MatchesRetailPayload(bool birth, uint opcode)
    {
        byte[] body = birth
            ? ClientCommandRequests.BuildQueryBirth(7u, 0x50000001u)
            : ClientCommandRequests.BuildQueryAge(7u, 0x50000001u);

        Assert.Equal(16, body.Length);
        Assert.Equal(InteractRequests.GameActionEnvelope, Read(body, 0));
        Assert.Equal(7u, Read(body, 4));
        Assert.Equal(opcode, Read(body, 8));
        Assert.Equal(0x50000001u, Read(body, 12));
    }

    [Fact]
    public void ConfirmationResponse_MatchesRetailPayload()
    {
        byte[] body = ClientCommandRequests.BuildConfirmationResponse(
            9u, confirmationType: 7u, contextId: 42u, accepted: true);

        Assert.Equal(24, body.Length);
        Assert.Equal(InteractRequests.GameActionEnvelope, Read(body, 0));
        Assert.Equal(9u, Read(body, 4));
        Assert.Equal(ClientCommandRequests.ConfirmationResponseOpcode, Read(body, 8));
        Assert.Equal(7u, Read(body, 12));
        Assert.Equal(42u, Read(body, 16));
        Assert.Equal(1u, Read(body, 20));
    }

    public static TheoryData<Func<uint, string, byte[]>, uint> StringActions => new()
    {
        { ClientCommandRequests.BuildSetAfkMessage, ClientCommandRequests.SetAfkMessageOpcode },
        { ClientCommandRequests.BuildEmote, ClientCommandRequests.EmoteOpcode },
        { ClientCommandRequests.BuildAddFriend, ClientCommandRequests.AddFriendOpcode },
        { ClientCommandRequests.BuildRemoveConsent, ClientCommandRequests.RemoveConsentOpcode },
    };

    [Theory]
    [MemberData(nameof(StringActions))]
    public void StringAction_PacksAlignedCp1252String16L(
        Func<uint, string, byte[]> build, uint opcode)
    {
        byte[] body = build(11u, "Bjørn");

        Assert.Equal(20, body.Length);
        Assert.Equal(InteractRequests.GameActionEnvelope, Read(body, 0));
        Assert.Equal(11u, Read(body, 4));
        Assert.Equal(opcode, Read(body, 8));
        Assert.Equal(5, BinaryPrimitives.ReadUInt16LittleEndian(body.AsSpan(12)));
        Assert.Equal([0x42, 0x6A, 0xF8, 0x72, 0x6E], body[14..19]);
        Assert.Equal(0, body[19]);
    }

    [Fact]
    public void SetAfkMode_MatchesRetailBooleanPayload()
    {
        byte[] body = ClientCommandRequests.BuildSetAfkMode(12u, away: true);

        Assert.Equal(16, body.Length);
        Assert.Equal(ClientCommandRequests.SetAfkModeOpcode, Read(body, 8));
        Assert.Equal(1u, Read(body, 12));
    }

    [Fact]
    public void FriendAndGlobalSquelchIntegerActions_MatchRetailPayloads()
    {
        byte[] remove = ClientCommandRequests.BuildRemoveFriend(2u, 0x50000001u);
        byte[] filter = ClientCommandRequests.BuildModifyGlobalSquelch(3u, add: false, 17u);

        Assert.Equal(ClientCommandRequests.RemoveFriendOpcode, Read(remove, 8));
        Assert.Equal(0x50000001u, Read(remove, 12));
        Assert.Equal(ClientCommandRequests.ModifyGlobalSquelchOpcode, Read(filter, 8));
        Assert.Equal(0u, Read(filter, 12));
        Assert.Equal(17u, Read(filter, 16));
    }

    [Fact]
    public void CharacterSquelch_PreservesRetailFieldOrder()
    {
        byte[] body = ClientCommandRequests.BuildModifyCharacterSquelch(
            4u, add: true, 0x50000001u, "Alice", 12u);

        Assert.Equal(32, body.Length);
        Assert.Equal(ClientCommandRequests.ModifyCharacterSquelchOpcode, Read(body, 8));
        Assert.Equal(1u, Read(body, 12));
        Assert.Equal(0x50000001u, Read(body, 16));
        Assert.Equal(5, BinaryPrimitives.ReadUInt16LittleEndian(body.AsSpan(20)));
        Assert.Equal(12u, Read(body, 28));
    }

    [Fact]
    public void AccountSquelch_PreservesRetailFieldOrder()
    {
        byte[] body = ClientCommandRequests.BuildModifyAccountSquelch(
            5u, add: false, "Alice");

        Assert.Equal(24, body.Length);
        Assert.Equal(ClientCommandRequests.ModifyAccountSquelchOpcode, Read(body, 8));
        Assert.Equal(0u, Read(body, 12));
        Assert.Equal(5, BinaryPrimitives.ReadUInt16LittleEndian(body.AsSpan(16)));
    }

    [Fact]
    public void DesiredComponentLevel_MatchesRetailTwoIntegerPayload()
    {
        byte[] body = ClientCommandRequests.BuildSetDesiredComponentLevel(
            6u, 0x12000042u, 25u);

        Assert.Equal(20, body.Length);
        Assert.Equal(ClientCommandRequests.SetDesiredComponentLevelOpcode, Read(body, 8));
        Assert.Equal(0x12000042u, Read(body, 12));
        Assert.Equal(25u, Read(body, 16));
    }

    [Fact]
    public void LegacyFriendsCommand_IsAControlMessageWithoutGameActionEnvelope()
    {
        byte[] body = ClientCommandRequests.BuildLegacyFriendsCommand(0u, string.Empty);

        Assert.Equal(12, body.Length);
        Assert.Equal(ClientCommandRequests.LegacyFriendsOpcode, Read(body, 0));
        Assert.Equal(0u, Read(body, 4));
        Assert.Equal(0, BinaryPrimitives.ReadUInt16LittleEndian(body.AsSpan(8)));
    }

    private static uint Read(byte[] body, int offset) =>
        BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(offset));
}