using Newtonsoft.Json.Linq;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.CompilerServices;
using System.Runtime.Serialization.Json;
using System.Text;
using System.Threading.Tasks;

namespace Pf2eModel.Model.Common.I18n;

public class LocaleString : ICollection<LocaleItem>
{
    private readonly List<LocaleItem> _items = [];
    private void AssureDefault()
    {
        if (_items.Count == 0)
        {
            _items.Add(new LocaleItem(LocaleType.English, string.Empty));
        }
    }

    public int Count => _items.Count;

    public bool IsReadOnly => false;

    public ICollection<LocaleType> Types => _items.Select(c => c.Locale).ToList();

    public LocaleString()
    {
        AssureDefault();
    }

    private LocaleType _E(string localeString) => LocaleExtension.GetTypeByString(localeString);

    private LocaleType RealLocale(LocaleType locale) => Contains(locale) ? locale : LocaleType.English;
    private LocaleType RealLocale(string localeString) => RealLocale(_E(localeString));

    public LocaleItem GetItem(LocaleType locale) => this.First(c => c.Locale == RealLocale(locale));
    public LocaleItem GetItem(string locale) => this.First(c => c.Locale == RealLocale(locale));

    public string this[LocaleType locale]
    {
        get => GetItem(locale).Value;
        set 
        {
            if (Types.Contains(locale))
            {
                GetItem(locale).Value = value;
            }
            else
            {
                _items.Add(new LocaleItem(locale, value));
            }
        }
    }
    public string this[string localeString]
    {
        get => this[_E(localeString)];
        set => this[_E(localeString)] = value;
    }

    public void Add(LocaleItem item)
    {
        this[item.Locale] = item.Value;
    }
    public void Add(LocaleType locale, string value)
    {
        this[locale] = value;
    }

    public void Clear()
    {
        _items.Clear();
        AssureDefault();
    }

    public bool Contains(LocaleItem item)
    {
        return _items.Contains(item);
    }
    public bool Contains(LocaleType locale)
    {
        return Types.Contains(locale);
    }
    public bool Contains(string value)
    {
        return this.Any(item => item.Value == value);
    }

    public void CopyTo(LocaleItem[] array, int arrayIndex)
    {
        throw new NotImplementedException();
    }

    public bool Remove(LocaleItem item)
    {
        bool result = _items.Remove(item);

        if (Count == 0)
        {
            AssureDefault();
            return false;
        }

        return result;
    }

    public IEnumerator<LocaleItem> GetEnumerator()
    {
        return _items.GetEnumerator();
    }
    IEnumerator IEnumerable.GetEnumerator()
    {
        return GetEnumerator();
    }

    public override string ToString()
    {
        return this[LocaleType.English];
    }

    public string Serialize()
    {
        JObject json = [];

        foreach (LocaleItem item in _items)
        {
            json.Add(item.Locale.GetTypeString(), item.Value);
        }

        return json.ToString();
    }
    public static LocaleString Deserialize(string input)
    {
        JObject json = JObject.Parse(input);
        LocaleString result = new();

        foreach (var item in json)
        {
            result[item.Key] = item.ToString();
        }

        return result;
    }

}