using System;
using UnityEngine;
using System.Collections.Generic;
using System.Linq;
using game;

namespace RND
{

    public class LevelSettings
    {
        public IReadOnlyList<uint> DefaultSequence => _defaultSequence;
        public IReadOnlyList<EnumLevelType> DefaultPattern => _defaultPattern;
        public IReadOnlyList<ConfLevelsPattern> Patterns => _patterns;
        public IList<LevelData> GetAll => _levels;
        public int TutorialLenght { get; } = 0;
        public bool HasTutorial => TutorialLenght > 0;

        private readonly List<uint> _defaultSequence = default;
        private readonly List<EnumLevelType> _defaultPattern = default;
        private readonly List<ConfLevelsPattern> _patterns = default;
        private readonly List<LevelData> _levels = default;

        public LevelSettings(ConfGameLevels config)
        {
            _defaultSequence = config.original;
            _defaultPattern = config.originalPattern.sequence;
            _patterns = config.customPatterns;
            _levels = new List<LevelData>(config.levels.Count);

            for (int i = 0; i < config.levels.Count; i++)
                _levels.Add(new LevelData(config.levels[i]));

            IList<uint> tutorial = GetIDsBy(l => l.Type == EnumLevelType.TUTORIAL);
            TutorialLenght = tutorial.Count;

            if (_defaultSequence.ContainsAnyOf(tutorial))
                throw new InvalidOperationException("Default sequence has tutorial level.");

            Log.Debug($"LevelSettings.Constructor: Uploaded successful {_levels.Count}");
        }

        public List<EnumLevelType> GetRandomPattern()
        {
            return _patterns.RandomValue().sequence;
        }

        public IList<LevelData> GetBy([JetBrains.Annotations.NotNull] Predicate<LevelData> conditional)
        {
            if (conditional == null)
                throw new ArgumentNullException(nameof(conditional));

            return
                (from item in _levels
                    where conditional.Invoke(item)
                    select item).ToList();
        }

        public IList<uint> GetIDsBy([JetBrains.Annotations.NotNull] Predicate<LevelData> conditional)
        {
            if (conditional == null)
                throw new ArgumentNullException(nameof(conditional));

            return
                (from item in _levels
                    where conditional.Invoke(item)
                    select item.ID).ToList();
        }

        public static GameObject GetPrefabByID(uint id)
        {
            return Assets.Load<GameObject>(GetPrefabPath(id));
        }

        public static string GetPrefabPath(uint id)
        {
            return $"Levels/Level{id}";
        }
    }
}