using System.Reflection;
using JNPF.DependencyInjection;

namespace JNPF.Common.Extension;

/// <summary>
/// 字典辅助扩展方法.
/// </summary>
[SuppressSniffer]
public static class DictionaryExtensions
{

    /// <summary>
    /// 从字典中获取值，不存在则返回字典<typeparamref name="TValue"/>类型的默认值.
    /// </summary>
    /// <typeparam name="TKey">字典键类型.</typeparam>
    /// <typeparam name="TValue">字典值类型.</typeparam>
    /// <param name="dictionary">要操作的字典.</param>
    /// <param name="key">指定键名.</param>
    /// <returns>获取到的值.</returns>
    public static TValue GetOrDefault<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key)
    {
        return dictionary.TryGetValue(key, out TValue value) ? value : default(TValue);
    }

    /// <summary>
    /// 获取指定键的值，不存在则按指定委托添加值.
    /// </summary>
    /// <typeparam name="TKey">字典键类型.</typeparam>
    /// <typeparam name="TValue">字典值类型.</typeparam>
    /// <param name="dictionary">要操作的字典.</param>
    /// <param name="key">指定键名.</param>
    /// <param name="addFunc">添加值的委托.</param>
    /// <returns>获取到的值.</returns>
    public static TValue GetOrAdd<TKey, TValue>(this IDictionary<TKey, TValue> dictionary, TKey key, Func<TValue> addFunc)
    {
        if (dictionary.TryGetValue(key, out TValue value))
        {
            return value;
        }

        return dictionary[key] = addFunc();
    }

    /// <summary>
    /// 替换值.
    /// </summary>
    /// <param name="dictionary1"></param>
    /// <param name="dictionary2"></param>
    public static void ReplaceValue(this Dictionary<string, object> dictionary1, Dictionary<string, object> dictionary2)
    {
        foreach (var item in dictionary2.Keys)
        {
            if (dictionary1.ContainsKey(item))
            {
                dictionary1[item] = dictionary2[item];
            }
        }
    }

    private static Dictionary<string, string[]> dicProperties = new Dictionary<string, string[]>(StringComparer.OrdinalIgnoreCase);
    /// <summary>
    /// 字典转换成指定类型实例
    /// added by ly on 20230524
    /// </summary>
    /// <typeparam name="T">转换的目标类型</typeparam>
    /// <param name="dictionary">被转换的字典</param>
    /// <returns>转换后的目标类型对象实例</returns>
    public static T ToObject<T>(this Dictionary<String, Object> dictionary) where T : class, new()
    {
        var name = typeof(T).Name;
        T instance = new();
        if (!dicProperties.TryGetValue(name, out string[] properies))
        {
            properies = instance.GetType().GetProperties(BindingFlags.Instance | BindingFlags.Public).Select(p => p.Name).ToArray();
            dicProperties[name] = properies;
        }
        foreach (var pn in properies)
        {
            if (dictionary.ContainsKey(pn))
            {
                instance.PropertySetValue(pn, dictionary[pn]);
            }
        }
        return instance;
    }
}