using System.Collections.ObjectModel;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Runtime.Serialization;
using System.Text;

namespace Model
{
    [DataContract]
    public sealed class Game : INotifyPropertyChanged, IEquatable<Game>
    {
        [DataMember]
        public string Name
        {
            get => name;
            private set
            {
                if (string.IsNullOrWhiteSpace(value)) name = "Default";
                else name = value;
                NotifyPropertyChanged();
            }
        }
        private string name = default!;

        [DataMember]
        public string Description
        {
            get => description;
            private set
            {
                if (string.IsNullOrWhiteSpace(value)) description = "Defaut";
                else description = value;
                NotifyPropertyChanged();
            }
        }
        private string description = default!;

        [DataMember]
        public int Year
        {
            get => year;
            private set
            {
                if (value < 1957 || value > 2023) year = 2023;
                else year = value;
                NotifyPropertyChanged();
            }
        }
        private int year = default!;

        [DataMember]
        public string Cover
        {
            get => cover;
            private set
            {
                if (string.IsNullOrWhiteSpace(value)) cover = "no_cover.png";
                else cover = value;
                NotifyPropertyChanged();
            }
        }
        private string cover = default!;
        
        public ReadOnlyCollection<string> Tags
        {
            get => tags.AsReadOnly();
            private set
            {
                if (value == null || value.Count > 3) tags = new List<string>();
                else tags = value.ToList();
                NotifyPropertyChanged();
            }
        }
        [DataMember]
        private List<string> tags;

        public ReadOnlyCollection<Review> Reviews => reviews.AsReadOnly();

        [DataMember]
        private readonly List<Review> reviews;

        public double Average => Reviews.Any() ? Math.Round(Reviews.Select(review => review.Rate).Average(), 1) : 0;

        [DataMember]
        public string Lien { 
            get => lien;
            private set
            {
                if (string.IsNullOrWhiteSpace(value)) lien = "Pas de lien";
                else lien = value;
                NotifyPropertyChanged();
            }
        }
        private string lien = default!;

        public Game(string name, string description, int year, List<string> c_tags, string cover, string c_lien)
        {
            if (string.IsNullOrWhiteSpace(name)) Name = "Default";
            else Name = name;
            if (string.IsNullOrWhiteSpace(description)) Description = "Pas de description";
            else Description = description;
            Year = year;
            if (c_tags is not null) tags = new List<string>(c_tags);
            else tags = new List<string>();
            if (string.IsNullOrWhiteSpace(cover)) Cover = "no_cover.png";
            else Cover = cover;
            if (string.IsNullOrWhiteSpace(c_lien)) Lien = "Pas de lien";
            else Lien = c_lien;
            reviews = new List<Review>();
        }

        public event PropertyChangedEventHandler? PropertyChanged;

        private void NotifyPropertyChanged([CallerMemberName] string propertyName = "")
            => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

        public override int GetHashCode()
        {
            if (string.IsNullOrWhiteSpace(Name)) return 0;
            return Name.GetHashCode();  
        }

        public override bool Equals(object? obj)
        {
            if (object.ReferenceEquals(obj, null)) return false;
            if (object.ReferenceEquals(this, obj)) return true;
            if (this.GetType() != obj.GetType()) return false;
            return this.Equals(obj as Game);
        }

        public bool Equals(Game? other)
        {
            if (string.IsNullOrWhiteSpace(Name)) return false;
            return other != null && Name.Equals(other.Name);
        }

        public override string ToString()
        {
            StringBuilder builder = new();
            builder.Append($"{Name} : {Description} : {Year} : {Cover} : {lien}\n");

            foreach (Review review in Reviews)
            {
                builder.Append($"{review}\n");
            }

            return builder.ToString();
        }

        public void AddReview(Review review)
        {
            reviews.Add(review);
            UpdateReviews();
        }
        public void RemoveReview(Review review)
        {
            reviews.Remove(review);
            UpdateReviews();
        }
        public void UpdateReviews()
        {
            NotifyPropertyChanged(nameof(Reviews));
            NotifyPropertyChanged(nameof(Average));
        }
        public void DescChange(string newdesc)
        {
            description = newdesc;
        }
        public void TagChange(List<string> newtag)
        {
            if (newtag != null && newtag.Count<=3) tags = new List<string>(newtag);
        }
        public void NameChange(string newname)
        {
            name = newname;
        }
        public void YearChange(int newyear)
        {
            year = newyear;
        }
    }
}