using Furion;
using Furion.DatabaseAccessor;
using Furion.DataEncryption;
using MediatR;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Metadata.Internal;
using Microsoft.Extensions.Caching.Distributed;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Xml;

namespace FlexJobApi.Core
{
    /// <summary>
    /// 注释文档工具
    /// </summary>
    public static class XmlDocUtils
    {
        private const string cacheKey = "XmlDoc";

        public static XmlDoc XmlDoc { get; set; }

        /// <summary>
        /// 生成注释文档
        /// </summary>
        /// <returns></returns>
        public static async Task<XmlDoc> BuildXmlDocAsync()
        {
            var xmlDoc = new XmlDoc();
            foreach (var item in App.Assemblies)
            {
                var path = item.Location.Replace("dll", "xml");
                if (File.Exists(path))
                {
                    var document = new XmlDocument();
                    document.Load(path);
                    var memberNodes = document.SelectNodes("//member");
                    if (memberNodes != null)
                    {
                        foreach (XmlNode memberNode in memberNodes)
                        {
                            var memberName = memberNode.Attributes?["name"]?.Value;
                            if (!string.IsNullOrEmpty(memberName))
                            {
                                var member = new XmlDocMember
                                {
                                    Name = memberName,
                                    Summary = memberNode.SelectSingleNode("summary")?.InnerText?.Trim(),
                                    Returm = memberNode.SelectSingleNode("returns")?.InnerText?.Trim()
                                };
                                var paramNodes = memberNode.SelectNodes("param");
                                if (paramNodes != null)
                                {
                                    foreach (XmlNode paramNode in paramNodes)
                                    {
                                        var paramNodeName = paramNode.Attributes?["name"]?.Value;
                                        if (!string.IsNullOrEmpty(paramNodeName))
                                        {
                                            member.Parameters.Add(new XmlDocMember
                                            {
                                                Name = paramNodeName,
                                                Summary = paramNode.InnerText?.Trim()
                                            });
                                        }
                                    }
                                }
                                xmlDoc.Members.Add(member);
                            }
                        }
                    }
                }
            }

            XmlDoc = xmlDoc;

            if (xmlDoc.Members.Any())
            {
                var json = JsonConvert.SerializeObject(xmlDoc);
                await App.GetService<IDistributedCache>().SetStringAsync(cacheKey, json);
                return xmlDoc;
            }
            return null;
        }

        /// <summary>
        /// 获取注释文档
        /// </summary>
        /// <returns></returns>
        public static async Task<XmlDoc> GetXmlDocAsync()
        {
            if (XmlDoc == null)
            {
                var json = await App.GetService<IDistributedCache>().GetStringAsync(cacheKey);
                if (!string.IsNullOrEmpty(json))
                {
                    XmlDoc = JsonConvert.DeserializeObject<XmlDoc>(json);
                }
                if (XmlDoc == null)
                {
                    XmlDoc = await BuildXmlDocAsync();
                }
            }
            return XmlDoc;
        }

        /// <summary>
        /// 获取注释文档成员
        /// </summary>
        /// <param name="memberInfo"></param>
        /// <param name="xmlDoc"></param>
        /// <returns></returns>
        public static async Task<XmlDocMember> GetXmlDocMemberAsync(this MemberInfo memberInfo, XmlDoc xmlDoc = null)
        {
            if (xmlDoc == null)
            {
                xmlDoc = await GetXmlDocAsync();
            }
            if (xmlDoc != null && memberInfo != null)
            {
                var memberName = GetXmlDocMemberName(memberInfo);
                return xmlDoc.Members.FirstOrDefault(it => it.Name == memberName);
            }
            return null;
        }

        private static string GetXmlDocMemberName(MemberInfo memberInfo)
        {
            if (memberInfo != null)
            {
                if (memberInfo is Type type)
                {
                    return $"T:{GetTypeName(type)}";
                }
                else if (memberInfo is MethodInfo methodInfo && methodInfo.DeclaringType != null)
                {
                    var methodName = $"M:{GetTypeName(methodInfo.DeclaringType)}.{methodInfo.Name}";
                    var parameters = methodInfo.GetParameters();
                    if (parameters.Length > 0)
                    {
                        methodName += $"({string.Join(",", parameters.Select(p => GetTypeName(p.ParameterType)))})";
                    }
                    return methodName;
                }
                else if (memberInfo is FieldInfo fieldInfo && fieldInfo.DeclaringType != null)
                {
                    return $"F:{GetTypeName(fieldInfo.DeclaringType)}.{fieldInfo.Name}";
                }
                else if (memberInfo is PropertyInfo propertyInfo && propertyInfo.DeclaringType != null)
                {
                    return $"P:{GetTypeName(propertyInfo.DeclaringType)}.{propertyInfo.Name}";
                }
            }
            return string.Empty;
        }

        private static string GetTypeName(Type type)
        {
            if (type.IsGenericType)
            {
                var genericTypeDefinition = type.GetGenericTypeDefinition();
                var genericArguments = type.GetGenericArguments();
                var baseName = genericTypeDefinition.FullName?.Replace('+', '.') ?? "";
                baseName = baseName.Substring(0, baseName.IndexOf('`'));
                return $"{baseName}`{genericArguments.Length}";
            }
            else if (type.IsArray)
            {
                var elementType = type.GetElementType();
                if (elementType != null)
                {
                    return $"{GetTypeName(elementType)}[]";
                }
            }
            else if (type.IsNested && type.DeclaringType != null)
            {
                return $"{GetTypeName(type.DeclaringType)}+{type.Name}";
            }
            return type.FullName?.Replace('+', '.') ?? "";
        }
    }
}