using Com.Ctrip.Framework.Apollo;
using Com.Ctrip.Framework.Apollo.Enums;
using Com.Ctrip.Framework.Apollo.Logging;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Primitives;
using System.Reflection;

namespace Tiobon.Core.Extensions.Apollo;

public static class ConfigurationBuilderExtensions
{
    /// <summary>
    /// 接入Apollo
    /// </summary>
    /// <param name="builder"></param>
    /// <param name="jsonPath">apollo配置文件路径 如果写入appsettings.json中 则jsonPath传null即可</param>
    public static void AddConfigurationApollo(this IConfigurationBuilder builder,string jsonPath)
    {
        if (!string.IsNullOrEmpty(jsonPath))
        {
            builder.AddJsonFile(jsonPath, true, false);
        }
        //阿波罗的日志级别调整
        LogManager.UseConsoleLogging(LogLevel.Warn);
        var options = new ApolloOptions();
        var root = builder.Build();
        root.Bind("Apollo", options);
        if (options.Enable)
        {
            var apolloBuilder = builder.AddApollo(root.GetSection("Apollo:Config"));

            foreach (var item in options.Namespaces)
            {
                apolloBuilder.AddNamespace(item.Name, MatchConfigFileFormat(item.Format));
            }
            //监听apollo配置
            Monitor(builder.Build());
        }

    }
    #region private
    /// <summary>
    /// 监听配置
    /// </summary>
    private static void Monitor(IConfigurationRoot root)
    {
        //TODO 需要根据改变执行特定的操作 如 mq redis  等其他跟配置相关的中间件
        //TODO 初步思路：将需要执行特定的操作key和value放入内存字典中，在赋值操作时通过标准事件来执行特定的操作。

        //要重新Build 此时才将Apollo provider加入到ConfigurationBuilder中
        ChangeToken.OnChange(() => root.GetReloadToken(), () =>
        {
            foreach (var apolloProvider in root.Providers.Where(p => p is ApolloConfigurationProvider))
            {
                var property = apolloProvider.GetType().BaseType.GetProperty("Data", BindingFlags.Instance | BindingFlags.NonPublic);
                var data = property.GetValue(apolloProvider) as IDictionary<string, string>;
                foreach (var item in data)
                {
                    Console.WriteLine($"key {item.Key}   value {item.Value}");
                }
            }
        });
    }

    //匹配格式
    private static ConfigFileFormat MatchConfigFileFormat(string value) => value switch
    {
        "json" => ConfigFileFormat.Json,
        "properties" => ConfigFileFormat.Properties,
        "xml" => ConfigFileFormat.Xml,
        "yml" => ConfigFileFormat.Yml,
        "yaml" => ConfigFileFormat.Yaml,
        "txt" => ConfigFileFormat.Txt,
        _ => throw new FormatException($"与apollo命名空间的所允许的类型不匹配：{string.Join(",", GetConfigFileFormat())}"),
    };
    //获取数据格式对应的枚举
    private static IEnumerable<string> GetConfigFileFormat() => Enum.GetValues<ConfigFileFormat>().Select(u => u.ToString().ToLower());
    #endregion

}
