using System;
using System.Buffers;
using Server.Network;
using Xunit;

namespace Server.Tests.Network.Packets
{
  public class EffectPackets
  {
    [Fact]
    public void TestParticleEffect()
    {
      EffectType effectType = EffectType.Moving;
      Serial serial = 0x4000;
      Serial from = 0x1000;
      Serial to = 0x2000;
      var itemId = 0x100;
      Point3D fromPoint = new Point3D(1000, 100, -10);
      Point3D toPoint = new Point3D(1500, 500, 0);
      byte speed = 3;
      byte duration = 2;
      bool direction = false;
      bool explode = false;
      int hue = 0x1024;
      int renderMode = 1;
      ushort effect = 3;
      ushort explodeEffect = 0;
      ushort explodeSound = 0;
      byte layer = 9;
      ushort unknown = 0;

      Span<byte> data = new ParticleEffect(
        effectType, from, to, itemId,
        fromPoint, toPoint, speed, duration,
        direction, explode, hue, renderMode,
        effect, explodeEffect, explodeSound, serial,
        layer, unknown
      ).Compile();

      Span<byte> expectedData = stackalloc byte[49];

      int pos = 0;
      expectedData.Write(ref pos, (byte)0xC7); // Packet ID
      expectedData.Write(ref pos, (byte)effectType);
      expectedData.Write(ref pos, from);
      expectedData.Write(ref pos, to);
      expectedData.Write(ref pos, (ushort)itemId);
      expectedData.Write(ref pos, fromPoint);
      expectedData.Write(ref pos, toPoint);
      expectedData.Write(ref pos, speed);
      expectedData.Write(ref pos, duration);
#if NO_LOCAL_INIT
      expectedData.Write(ref pos, (ushort)0);
#else
      pos += 2;
#endif
      expectedData.Write(ref pos, direction);
      expectedData.Write(ref pos, explode);
      expectedData.Write(ref pos, hue);
      expectedData.Write(ref pos, renderMode);
      expectedData.Write(ref pos, effect);
      expectedData.Write(ref pos, explodeEffect);
      expectedData.Write(ref pos, explodeSound);
      expectedData.Write(ref pos, serial);
      expectedData.Write(ref pos, layer);
      expectedData.Write(ref pos, unknown);

      AssertThat.Equal(data, expectedData);
    }

    [Fact]
    public void TestHuedEffect()
    {
      EffectType effectType = EffectType.Moving;
      Serial serial = 0x4000;
      Serial from = 0x1000;
      Serial to = 0x2000;
      var itemId = 0x100;
      Point3D fromPoint = new Point3D(1000, 100, -10);
      Point3D toPoint = new Point3D(1500, 500, 0);
      byte speed = 3;
      byte duration = 2;
      bool direction = false;
      bool explode = false;
      int hue = 0x1024;
      int renderMode = 1;

      Span<byte> data = new HuedEffect(
        effectType, from, to, itemId,
        fromPoint, toPoint, speed, duration,
        direction, explode, hue, renderMode
      ).Compile();

      Span<byte> expectedData = stackalloc byte[36];

      int pos = 0;
      expectedData.Write(ref pos, (byte)0xC0); // Packet ID
      expectedData.Write(ref pos, (byte)effectType);
      expectedData.Write(ref pos, from);
      expectedData.Write(ref pos, to);
      expectedData.Write(ref pos, (ushort)itemId);
      expectedData.Write(ref pos, fromPoint);
      expectedData.Write(ref pos, toPoint);
      expectedData.Write(ref pos, speed);
      expectedData.Write(ref pos, duration);
#if NO_LOCAL_INIT
      expectedData.Write(ref pos, (ushort)0);
#else
      pos += 2;
#endif
      expectedData.Write(ref pos, direction);
      expectedData.Write(ref pos, explode);
      expectedData.Write(ref pos, hue);
      expectedData.Write(ref pos, renderMode);

      AssertThat.Equal(data, expectedData);
    }

    [Fact]
    public void TestScreenEffect()
    {
      var type = ScreenEffectType.FadeOut;
      Span<byte> data = new ScreenEffect(type).Compile();

      Span<byte> expectedData = stackalloc byte[28];
      int pos = 0;

      expectedData.Write(ref pos, (byte)0x70); // Packet ID
      expectedData.Write(ref pos, (byte)0x04); // Effect
#if NO_LOCAL_INIT
      expectedData.Write(ref pos, 0);
      expectedData.Write(ref pos, 0);
#else
      pos += 8;
#endif

      expectedData.Write(ref pos, (ushort)type); // Screen Effect Type

#if NO_LOCAL_INIT
      expectedData.Write(ref pos, 0);
      expectedData.Write(ref pos, 0);
      expectedData.Write(ref pos, 0);
      expectedData.Write(ref pos, 0);
#endif

      AssertThat.Equal(data, expectedData);
    }

    [Fact]
    public void TestBoltEffect()
    {
      IEntity entity = new Entity(0x1000, new Point3D(1000, 100, -10), Map.Felucca);
      var hue = 0x1024;
      Span<byte> data = new BoltEffect(entity, hue).Compile();

      Span<byte> expectedData = stackalloc byte[36];
      int pos = 0;
      expectedData.Write(ref pos, (byte)0xC0); // Packet ID
      expectedData.Write(ref pos, (byte)0x01); // Effect


      expectedData.Write(ref pos, entity.Serial);
#if NO_LOCAL_INIT
      expectedData.Write(ref pos, 0);
      expectedData.Write(ref pos, (ushort)0);
#else
      pos += 6;
#endif
      expectedData.Write(ref pos, entity.Location);
      expectedData.Write(ref pos, entity.Location);
#if NO_LOCAL_INIT
      expectedData.Write(ref pos, 0);
      expectedData.Write(ref pos, (ushort)0);
#else
      pos += 6;
#endif
      expectedData.Write(ref pos, hue);

      AssertThat.Equal(data, expectedData);
    }
  }
}