using System;
using System.Collections.Generic;
using System.Text;
using Barotrauma.Particles;
using Barotrauma.Sounds;
using Microsoft.Xna.Framework;
using System.Xml.Linq;
using Barotrauma.Items.Components;
using System.Linq;

namespace Barotrauma
{
    partial class StatusEffect
    {
        private List<ParticleEmitter> particleEmitters;

        private readonly static HashSet<StatusEffect> ActiveLoopingSounds = new HashSet<StatusEffect>();
        private static double LastMuffleCheckTime;
        private readonly List<RoundSound> sounds = new List<RoundSound>();
        public IEnumerable<RoundSound> Sounds { get { return sounds; } }
        private SoundSelectionMode soundSelectionMode;
        private SoundChannel soundChannel;
        private Entity soundEmitter;
        private double loopStartTime;
        private bool loopSound;

        partial void InitProjSpecific(ContentXElement element, string parentDebugName)
        {
            particleEmitters = new List<ParticleEmitter>();

            foreach (var subElement in element.Elements())
            {
                switch (subElement.Name.ToString().ToLowerInvariant())
                {
                    case "particleemitter":
                        particleEmitters.Add(new ParticleEmitter(subElement));
                        break;
                    case "sound":
                        var sound = RoundSound.Load(subElement);
                        if (sound?.Sound != null)
                        {
                            loopSound = subElement.GetAttributeBool("loop", false);
                            if (subElement.GetAttribute("selectionmode") != null)
                            {
                                if (Enum.TryParse(subElement.GetAttributeString("selectionmode", "Random"), out SoundSelectionMode selectionMode))
                                {
                                    soundSelectionMode = selectionMode;
                                }
                            }
                            sounds.Add(sound);
                        }
                        break;
                }
            }
        }

        partial void ApplyProjSpecific(float deltaTime, Entity entity, IReadOnlyList<ISerializableEntity> targets, Hull hull, Vector2 worldPosition, bool playSound)
        {
            if (playSound)
            {
                PlaySound(entity, hull, worldPosition);
            }

            foreach (ParticleEmitter emitter in particleEmitters)
            {
                float angle = 0.0f;
                float particleRotation = 0.0f;
                bool mirrorAngle = false;
                if (emitter.Prefab.Properties.CopyEntityAngle)
                {
                    Limb targetLimb = null;
                    if (entity is Item item && item.body != null)
                    {
                        angle = item.body.Rotation + ((item.body.Dir > 0.0f) ? 0.0f : MathHelper.Pi);
                        particleRotation = -item.body.Rotation;
                        if (item.body.Dir < 0.0f)
                        {
                            particleRotation += MathHelper.Pi;
                            mirrorAngle = true;
                        }
                    }
                    else if (entity is Character c && !c.Removed && targetLimbs?.FirstOrDefault(l => l != LimbType.None) is LimbType l)
                    {
                        targetLimb = c.AnimController.GetLimb(l);
                    }
                    else
                    {
                        for (int i = 0; i < targets.Count; i++)
                        {
                            if (targets[i] is Limb limb)
                            {
                                targetLimb = limb;
                                break;
                            }
                        }
                    }
                    if (targetLimb != null && !targetLimb.Removed)
                    {
                        angle = targetLimb.body.Rotation + ((targetLimb.body.Dir > 0.0f) ? 0.0f : MathHelper.Pi);
                        particleRotation = -targetLimb.body.Rotation;
                        if (targetLimb.body.Dir < 0.0f)
                        {
                            particleRotation += MathHelper.Pi;
                            mirrorAngle = true;
                        }
                    }
                }

                emitter.Emit(deltaTime, worldPosition, hull, angle: angle, particleRotation: particleRotation, mirrorAngle: mirrorAngle);
            }            
        }

        private bool ignoreMuffling;

        private void PlaySound(Entity entity, Hull hull, Vector2 worldPosition)
        {
            if (sounds.Count == 0) return;

            if (soundChannel == null || !soundChannel.IsPlaying)
            {
                if (soundSelectionMode == SoundSelectionMode.All)
                {
                    foreach (RoundSound sound in sounds)
                    {
                        if (sound?.Sound == null)
                        {
                            string errorMsg = $"Error in StatusEffect.ApplyProjSpecific1 (sound \"{sound?.Filename ?? "unknown"}\" was null)\n" + Environment.StackTrace.CleanupStackTrace();
                            GameAnalyticsManager.AddErrorEventOnce("StatusEffect.ApplyProjSpecific:SoundNull1" + Environment.StackTrace.CleanupStackTrace(), GameAnalyticsManager.ErrorSeverity.Error, errorMsg);
                            return;
                        }
                        soundChannel = SoundPlayer.PlaySound(sound.Sound, worldPosition, sound.Volume, sound.Range, hullGuess: hull, ignoreMuffling: sound.IgnoreMuffling);
                        ignoreMuffling = sound.IgnoreMuffling;
                        if (soundChannel != null) { soundChannel.Looping = loopSound; }
                    }
                }
                else
                {
                    int selectedSoundIndex;
                    if (soundSelectionMode == SoundSelectionMode.ItemSpecific && entity is Item item)
                    {
                        selectedSoundIndex = item.ID % sounds.Count;
                    }
                    else if (soundSelectionMode == SoundSelectionMode.CharacterSpecific && entity is Character user)
                    {
                        selectedSoundIndex = user.ID % sounds.Count;
                    }
                    else
                    {
                        selectedSoundIndex = Rand.Int(sounds.Count);
                    }
                    var selectedSound = sounds[selectedSoundIndex];
                    if (selectedSound?.Sound == null)
                    {
                        string errorMsg = $"Error in StatusEffect.ApplyProjSpecific2 (sound \"{selectedSound?.Filename ?? "unknown"}\" was null)\n" + Environment.StackTrace.CleanupStackTrace();
                        GameAnalyticsManager.AddErrorEventOnce("StatusEffect.ApplyProjSpecific:SoundNull2" + Environment.StackTrace.CleanupStackTrace(), GameAnalyticsManager.ErrorSeverity.Error, errorMsg);
                        return;
                    }
                    soundChannel = SoundPlayer.PlaySound(selectedSound.Sound, worldPosition, selectedSound.Volume, selectedSound.Range, hullGuess: hull, ignoreMuffling: selectedSound.IgnoreMuffling);
                    ignoreMuffling = selectedSound.IgnoreMuffling;
                    if (soundChannel != null) { soundChannel.Looping = loopSound; }
                }
            }
            else
            {
                soundChannel.Position = new Vector3(worldPosition, 0.0f);
            }

            if (soundChannel != null && soundChannel.Looping)
            {
                ActiveLoopingSounds.Add(this);
                soundEmitter = entity;
                loopStartTime = Timing.TotalTime;
            }
        }

        static partial void UpdateAllProjSpecific(float deltaTime)
        {
            bool doMuffleCheck = Timing.TotalTime > LastMuffleCheckTime + 0.2;
            if (doMuffleCheck) { LastMuffleCheckTime = Timing.TotalTime; }
            foreach (StatusEffect statusEffect in ActiveLoopingSounds)
            {
                if (statusEffect.soundChannel == null) { continue; }

                //stop looping sounds if the statuseffect hasn't been applied in 0.1
                //= keeping the sound looping requires continuously applying the statuseffect
                if (Timing.TotalTime > statusEffect.loopStartTime + 0.1 && !DurationList.Any(e => e.Parent == statusEffect))
                {
                    statusEffect.soundChannel.FadeOutAndDispose();
                    statusEffect.soundChannel = null;
                }
                else
                {
                    statusEffect.soundChannel.Position = new Vector3(statusEffect.soundEmitter.WorldPosition, 0.0f);
                    if (doMuffleCheck && !statusEffect.ignoreMuffling)
                    {
                        statusEffect.soundChannel.Muffled = SoundPlayer.ShouldMuffleSound(
                            Character.Controlled, statusEffect.soundEmitter.WorldPosition, statusEffect.soundChannel.Far, Character.Controlled?.CurrentHull);
                    }
                }
            }
            ActiveLoopingSounds.RemoveWhere(s => s.soundChannel == null);
        }
    }
}