using System.Collections.Generic;

namespace Engine.Core.Config;

public class BasicConfiguration : IConfiguration
{
    public Event<IConfiguration, IConfiguration.ConfigUpdateArguments> OnAdded { get; } = new();
    public Event<IConfiguration, IConfiguration.ConfigUpdateArguments> OnSet { get; } = new();
    public Event<IConfiguration, IConfiguration.ConfigUpdateArguments> OnRemoved { get; } = new();

    private readonly Dictionary<string, object?> values = [];

    public IReadOnlyDictionary<string, object?> Values => values;

    public T? Get<T>(string key, T? defaultValue = default)
    {
        if (!values.TryGetValue(key, out object? value))
            return defaultValue;

        if (value is T castedObject)
            return castedObject;

        try { return (T?)System.Convert.ChangeType(value, typeof(T)); } catch { }

        return defaultValue;
    }

    public object? Get(string key)
    {
        values.TryGetValue(key, out object? value);
        return value;
    }

    public bool Has(string key) => values.ContainsKey(key);

    public void Remove<T>(string key)
    {
        if (values.Remove(key))
            OnRemoved.Invoke(this, new(key));
    }

    public void Set<T>(string key, T value)
    {
        if (!values.TryAdd(key, value))
            values[key] = value;
        else
            OnAdded.Invoke(this, new(key));
        OnSet.Invoke(this, new(key));
    }
}