using System.Collections.Immutable;

namespace InnovEnergy.Lib.Protocols.DBus.Daemon;


// TODO


#pragma warning disable CS8714

public record ObservableDictionary<K, V>
(
    IReadOnlyList<KeyValuePair<K, V>> Added,
    IReadOnlyList<KeyValuePair<K, V>> Removed,
    IReadOnlyList<KeyValuePair<K, V>> Changed,
    ImmutableDictionary<K, V> Items
)
{
    private static KeyValuePair<K, V>[] Nothing { get; } = Array.Empty<KeyValuePair<K, V>>();
    public static ObservableDictionary<K, V> Empty { get; } = new ObservableDictionary<K, V>(Nothing, Nothing, Nothing, ImmutableDictionary<K, V>.Empty);


    public ObservableDictionary<K, V> Add(K key, V value)
    {
        var added = new[] { new KeyValuePair<K, V>(key, value) };
        return new ObservableDictionary<K, V>(added, Nothing, Nothing, Items.Add(key, value));
    }

    public ObservableDictionary<K, V> AddRange(params KeyValuePair<K, V>[] added)
    {
        return new ObservableDictionary<K, V>(added, Nothing, Nothing, Items.AddRange(added));
    }

    public ObservableDictionary<K, V> SetItem(K key, V value)
    {
        var added = new[] { new KeyValuePair<K, V>(key, value) };
        return new ObservableDictionary<K, V>(added, Nothing, Nothing, Items.SetItem(key, value));
    }

    public ObservableDictionary<K, V> SetItems(params KeyValuePair<K, V>[] items)
    {
        return new ObservableDictionary<K, V>(items, Nothing, Nothing, Items.SetItems(items));
    }

    // public ObservableDictionary<K, V> Remove(params K[] removed)
    // {
    //     return new ObservableDictionary<K, V>(Nothing, removed, Nothing, Items.RemoveRange(removed));
    // }
};