using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using BITKit;
using BITKit.Entities;
using Net.BITKit.Impact;
using UnityEngine;

namespace Net.BITKit.VFX
{
    public class VFXService
    {
        private readonly IEntitiesService _entitiesService;
        private readonly IReadOnlyCollection<ScriptableImpact> _scriptableImpacts;

        public VFXService(IEntitiesService entitiesService)
        {
            _entitiesService = entitiesService;
            _scriptableImpacts = _entitiesService.QueryComponents<ScriptableImpact>().ToArray();
        }

        public AudioClip GetAudioClip(IReadOnlyCollection<string> tags)
        {
            var bestMatches = Search(tags);

            return bestMatches.AudioClip;
        }

        public Transform GetPrefab(IReadOnlyCollection<string> tags)
        {
            var bestMatches = Search(tags);
            return bestMatches.Prefab;
        }

        private ScriptableImpact Search(IReadOnlyCollection<string> tags)
        {
            var maxPoint = 0;
            var max = new HashSet<ScriptableImpact>();
            foreach (var impact in _scriptableImpacts)
            {
                var point = impact.Tags.Intersect(tags).Count();
                if (point > maxPoint)
                {
                    maxPoint = point;
                    max.Clear();
                    max.Add(impact);
                }else if (point == maxPoint)
                {
                    max.Add(impact);
                }
            }

            if (max.Count is 1)
            {
                return max.First();
            }
            
            return max.OrderByDescending(x => x.Priority).First();
        }
    }
}