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

namespace AcDream.Core.Net.Tests.Messages;

public sealed class SocialActionsTests
{
    [Fact]
    public void BuildQueryHealth_HasOpcode0x01BFAndGuid()
    {
        byte[] body = SocialActions.BuildQueryHealth(seq: 3, targetGuid: 0xCAFE);
        Assert.Equal(SocialActions.QueryHealthOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
        Assert.Equal(0xCAFEu,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(12)));
    }

    [Fact]
    public void BuildPingRequest_HasOpcode0x01E9()
    {
        byte[] body = SocialActions.BuildPingRequest(seq: 1, clientId: 42);
        Assert.Equal(SocialActions.PingRequestOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
        Assert.Equal(42u,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(12)));
    }

    [Fact]
    public void BuildFellowshipCreate_StringThenBools()
    {
        byte[] body = SocialActions.BuildFellowshipCreate(
            seq: 1, fellowshipName: "Team", openness: true, shareXp: false);

        Assert.Equal(SocialActions.FellowshipCreateOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
        // String at offset 12: u16 length = 4
        ushort len = BinaryPrimitives.ReadUInt16LittleEndian(body.AsSpan(12));
        Assert.Equal(4, len);
        Assert.Equal("Team", Encoding.ASCII.GetString(body.AsSpan(14, 4)));
        // string16L record = 2+4=6, pad 2 → advance by 8.
        // Then 2 bools at offset 20,21.
        Assert.Equal(1, body[20]);  // openness true
        Assert.Equal(0, body[21]);  // shareXp false
    }

    [Fact]
    public void BuildFellowshipQuit_CarriesDisbandFlag()
    {
        byte[] body = SocialActions.BuildFellowshipQuit(seq: 1, disband: true);
        Assert.Equal(SocialActions.FellowshipQuitOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
        Assert.Equal(1, body[12]);
    }

    [Fact]
    public void BuildFellowshipDismiss_HasGuid()
    {
        byte[] body = SocialActions.BuildFellowshipDismiss(seq: 1, targetGuid: 0xDEAD);
        Assert.Equal(SocialActions.FellowshipDismissOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
        Assert.Equal(0xDEADu,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(12)));
    }

    [Fact]
    public void BuildFellowshipRecruit_HasGuid()
    {
        byte[] body = SocialActions.BuildFellowshipRecruit(seq: 1, targetGuid: 0xBEEF);
        Assert.Equal(SocialActions.FellowshipRecruitOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
    }

    [Fact]
    public void BuildFellowshipUpdate_HasOpenBool()
    {
        byte[] body = SocialActions.BuildFellowshipUpdate(seq: 1, open: true);
        Assert.Equal(SocialActions.FellowshipUpdateOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
        Assert.Equal(1, body[12]);
    }

    [Fact]
    public void BuildSetCharacterOptions_HasBitmap()
    {
        byte[] body = SocialActions.BuildSetCharacterOptions(seq: 1, optionsBitmap: 0xDEADBEEFu);
        Assert.Equal(0xDEADBEEFu,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(12)));
    }

    [Fact]
    public void BuildAddChannel_ContainsName()
    {
        byte[] body = SocialActions.BuildAddChannel(seq: 1, channelName: "Trade");
        Assert.Equal(SocialActions.AddChannelOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
        ushort len = BinaryPrimitives.ReadUInt16LittleEndian(body.AsSpan(12));
        Assert.Equal(5, len);
        Assert.Equal("Trade", Encoding.ASCII.GetString(body.AsSpan(14, 5)));
    }

    [Fact]
    public void BuildRemoveChannel_HasOpcode0x0146()
    {
        byte[] body = SocialActions.BuildRemoveChannel(seq: 1, channelName: "General");
        Assert.Equal(SocialActions.RemoveChannelOpcode,
            BinaryPrimitives.ReadUInt32LittleEndian(body.AsSpan(8)));
    }
}