using Furion.DependencyInjection;
using Microsoft.Extensions.Caching.Memory;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;

namespace Magic.Core;

/// <summary>
/// 内存缓存
/// </summary>
public class MemoryCache : ICache, ISingleton
{
    private readonly IMemoryCache _memoryCache;

    public MemoryCache(IMemoryCache memoryCache)
    {
        _memoryCache = memoryCache;
    }

    public long Del(params string[] key)
    {
        foreach (var k in key)
        {
            _memoryCache.Remove(k);
        }
        return key.Length;
    }

    public Task<long> DelAsync(params string[] key)
    {
        foreach (var k in key)
        {
            _memoryCache.Remove(k);
        }

        return Task.FromResult((long)key.Length);
    }

    public async Task<long> DelByPatternAsync(string pattern)
    {
        if (string.IsNullOrEmpty(pattern))
            return default;

        //pattern = Regex.Replace(pattern, @"\{*.\}", "(.*)");
        var keys = GetAllKeys().Where(k => k.StartsWith(pattern));
        if (keys != null && keys.Any())
            return await DelAsync(keys.ToArray());

        return default;
    }

    public bool Exists(string key)
    {
        return _memoryCache.TryGetValue(key, out _);
    }

    public Task<bool> ExistsAsync(string key)
    {
        return Task.FromResult(_memoryCache.TryGetValue(key, out _));
    }

    public string Get(string key)
    {
        return _memoryCache.Get(key)?.ToString();
    }

    public T Get<T>(string key)
    {
        return _memoryCache.Get<T>(key);
    }

    public Task<string> GetAsync(string key)
    {
        return Task.FromResult(Get(key));
    }

    public Task<T> GetAsync<T>(string key)
    {
        return Task.FromResult(Get<T>(key));
    }

    public bool Set(string key, object value)
    {
        _memoryCache.Set(key, value);
        return true;
    }

    public bool Set(string key, object value, TimeSpan expire)
    {
        _memoryCache.Set(key, value, expire);
        return true;
    }

    public Task<bool> SetAsync(string key, object value)
    {
        Set(key, value);
        return Task.FromResult(true);
    }

    public Task<bool> SetAsync(string key, object value, TimeSpan expire)
    {
        Set(key, value, expire);
        return Task.FromResult(true);
    }

    public List<string> GetAllKeys()
    {
        //const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
        //var entries = _memoryCache.GetType().GetField("_entries", flags)?.GetValue(_memoryCache);
        //var cacheItems = entries?.GetType().GetProperty("Keys").GetValue(entries) as ICollection<object>; //entries as IDictionary;
        //var keys = new List<string>();
        //if (cacheItems == null) return keys;
        //return cacheItems.Select(u => u.ToString()).ToList();

        const BindingFlags flags = BindingFlags.Instance | BindingFlags.NonPublic;
        var entries = _memoryCache.GetType().GetField("_coherentState", flags)?.GetValue(_memoryCache);

        var cacheItems = entries?.GetType().GetProperty("EntriesCollection", flags).GetValue(entries) as ICollection; //entries as IDictionary;
        var keys = new List<string>();
        if (cacheItems == null) return keys;

        foreach (var item in cacheItems)
        {
            var methodInfo = item.GetType().GetProperty("Key");

            var val = methodInfo.GetValue(item);

            keys.Add(val.ToString());
        }

        return keys;


    }


}