using System;
using System.Collections.Generic;
using System.Xml;
using Oni.Metadata;

namespace Oni.Particles
{
    internal class ImpactEffect
    {
        #region Private data
        private string impactName;
        private int impactIndex;
        private string materialName;
        private int materialIndex;
        private ImpactEffectComponent component;
        private ImpactEffectModifier modifier;
        private ImpactEffectParticle[] particles;
        private int particleIndex;
        private ImpactEffectSound sound;
        private int soundIndex;
        #endregion

        public ImpactEffect(BinaryReader reader, string[] impacts, string[] materials, ImpactEffectParticle[] particles, ImpactEffectSound[] sounds)
        {
            impactIndex = reader.ReadInt16();
            impactName = impacts[impactIndex];
            materialIndex = reader.ReadInt16();
            materialName = materials[materialIndex];
            component = (ImpactEffectComponent)reader.ReadInt16();
            modifier = (ImpactEffectModifier)reader.ReadInt16();
            int particleCount = reader.ReadInt16();
            reader.Skip(2);
            soundIndex = reader.ReadInt32();
            particleIndex = reader.ReadInt32();

            if (soundIndex != -1)
                sound = sounds[soundIndex];

            if (particleCount > 0)
            {
                this.particles = new ImpactEffectParticle[particleCount];
                Array.Copy(particles, particleIndex, this.particles, 0, this.particles.Length);
            }
        }

        public void Write(BinaryWriter writer)
        {
            writer.WriteInt16(impactIndex);
            writer.WriteInt16(materialIndex);
            writer.WriteInt16((short)component);
            writer.WriteInt16((short)modifier);
            writer.WriteInt16(particles.Length);
            writer.Skip(2);
            writer.Write(soundIndex);
            writer.Write(particleIndex);
        }

        public ImpactEffect(XmlReader xml, string impact, string material)
        {
            impactName = impact;
            materialName = material;
            component = MetaEnum.Parse<ImpactEffectComponent>(xml.ReadElementContentAsString("Component", ""));
            modifier = MetaEnum.Parse<ImpactEffectModifier>(xml.ReadElementContentAsString("Modifier", ""));

            if (xml.IsStartElement("Sound"))
            {
                if (xml.IsEmptyElement)
                {
                    xml.Skip();
                }
                else
                {
                    xml.ReadStartElement();
                    sound = new ImpactEffectSound(xml);
                    xml.ReadEndElement();
                }
            }

            var list = new List<ImpactEffectParticle>();

            if (xml.IsStartElement("Particles"))
            {
                if (xml.IsEmptyElement)
                {
                    xml.Skip();
                }
                else
                {
                    xml.ReadStartElement();

                    while (xml.IsStartElement("Particle"))
                    {
                        xml.ReadStartElement();
                        list.Add(new ImpactEffectParticle(xml));
                        xml.ReadEndElement();
                    }

                    xml.ReadEndElement();
                }
            }

            particles = list.ToArray();
        }

        public void Write(XmlWriter writer)
        {
            writer.WriteElementString("Component", component.ToString());
            writer.WriteElementString("Modifier", modifier.ToString());

            writer.WriteStartElement("Sound");

            if (sound != null)
                sound.Write(writer);

            writer.WriteEndElement();

            writer.WriteStartElement("Particles");

            if (particles != null)
            {
                foreach (ImpactEffectParticle particle in particles)
                {
                    writer.WriteStartElement("Particle");
                    particle.Write(writer);
                    writer.WriteEndElement();
                }
            }

            writer.WriteEndElement();
        }

        public string ImpactName => impactName;

        public int ImpactIndex
        {
            get { return impactIndex; }
            set { impactIndex = value; }
        }

        public string MaterialName => materialName;

        public int MaterialIndex
        {
            get { return materialIndex; }
            set { materialIndex = value; }
        }

        public ImpactEffectComponent Component
        {
            get { return component; }
        }

        public ImpactEffectModifier Modifier
        {
            get { return modifier; }
        }

        public ImpactEffectSound Sound
        {
            get { return sound; }
        }

        public int SoundIndex
        {
            get { return soundIndex; }
            set { soundIndex = value; }
        }

        public int ParticleIndex
        {
            get { return particleIndex; }
            set { particleIndex = value; }
        }

        public ImpactEffectParticle[] Particles => particles;
    }
}