using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using WIDESEAWCS_Core.Attributes;

namespace WIDESEAWCS_Core.Utilities
{
    public class ModelValidate
    {
        /// <summary>
        /// 验证实体参数
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="data"></param>
        /// <returns></returns>
        public static (bool, string, object?) ValidateModelData<T>(T data) where T : class, new()
        {
            Type modelType = typeof(T);
            if (data == null) return (false, "传入参数不可为null", data);
            ModelValidateAttribute? modelAttribute = modelType.GetCustomAttribute<ModelValidateAttribute>();
            if (modelAttribute == null) return (false, $"{modelType.Name}未定义【ModelValidateAttribute】特性", data);
            PropertyInfo[] propertyInfos = modelType.GetProperties();
            return SimpleValidate(propertyInfos, data);
        }

        public static (bool, string, object?) ValidateModelData<T>(List<T> datas) where T : class, new()
        {
            Type modelType = typeof(T);
            if (datas == null) return (false, "传入参数不可为null", datas);
            if (datas.Count == 0) return (false, "集合个数不可等于0", datas);
            foreach (T data in datas)
            {
                if (data == null) return (false, "传入参数不可为null", data);
                ModelValidateAttribute? modelAttribute = modelType.GetCustomAttribute<ModelValidateAttribute>();
                if (modelAttribute == null) return (false, $"{modelType.Name}未定义【ModelValidateAttribute】特性", data);
                PropertyInfo[] propertyInfos = modelType.GetProperties();
                (bool, string, object?) result = SimpleValidate(propertyInfos, data);
                if (!result.Item1) return result;
            }

            return (true, $"成功", datas);
        }

        //private static (bool, string, object?) CustomMethodValidate<T>(ModelValidateAttribute modelAttribute, T data) where T : class, new()
        //{
        //    try
        //    {
        //        if (modelAttribute.CustomValidateMethodTypeName == null) return (false, $"自定义验证方法需要提供方法所在类的类型对象", data);
        //        if (modelAttribute.CustomValidateMethodName == null) return (false, $"自定义验证方法需要提供方法名", data);

        //        string path = Path.Combine(AppContext.BaseDirectory, $"{modelAttribute.CustomValidateAssemblyName}.dll");
        //        Assembly assembly = Assembly.LoadFrom(path);

        //        Type t = assembly.GetType(modelAttribute.CustomValidateAssemblyName + "." + modelAttribute.CustomValidateMethodTypeName);
        //        object bbb = App.GetService(t);
        //        MethodInfo? methodInfo = t.GetMethod(modelAttribute.CustomValidateMethodName);
        //        var result = methodInfo.Invoke(bbb, new object[] { data });
        //        //MethodInfo? methodInfo = modelAttribute.CustomValidateMethodType.GetMethod(modelAttribute.CustomValidateMethodName);
        //        //if (methodInfo == null) return (false, $"未在该类型对象【{modelAttribute.CustomValidateMethodType.Name}】中找到该方法【{modelAttribute.CustomValidateMethodName}】", data);
        //        //methodInfo.GetGenericArguments()
        //        return (true, "成功", data);
        //    }
        //    catch(Exception ex)
        //    {
        //        throw new Exception();
        //    }

        //}

        private static (bool, string, object?) SimpleValidate<T>(PropertyInfo[] propertyInfos, T data) where T : class, new()
        {
            try
            {
                foreach (PropertyInfo propertyInfo in propertyInfos)
                {
                    PropertyValidateAttribute? propertyAttribute = propertyInfo.GetCustomAttribute<PropertyValidateAttribute>();
                    if (propertyAttribute == null) continue;

                    object? value = propertyInfo.GetValue(data, null);
                    if (propertyAttribute.NotNullAndEmpty)
                    {
                        if (value == null) return (false, $"{(string.IsNullOrEmpty(propertyAttribute.Description) ? propertyInfo.Name : propertyAttribute.Description)}不可为null", data);
                        if (string.IsNullOrEmpty(value.ToString())) return (false, $"{(string.IsNullOrEmpty(propertyAttribute.Description) ? propertyInfo.Name : propertyAttribute.Description)}不可为空字符串", data);
                    }

                    if (propertyAttribute.MinValue > int.MinValue)
                    {
                        if (value == null) return (false, $"{(string.IsNullOrEmpty(propertyAttribute.Description) ? propertyInfo.Name : propertyAttribute.Description)}不可为null", data);
                        if (propertyAttribute.IsContainMinValue)
                        {
                            if (Convert.ToInt32(value.ToString()) < propertyAttribute.MinValue) return (false, $"{(string.IsNullOrEmpty(propertyAttribute.Description) ? propertyInfo.Name : propertyAttribute.Description)}的值【{value}】不可小于【{propertyAttribute.MinValue}】", data);
                        }
                        else
                        {
                            if (Convert.ToInt32(value.ToString()) <= propertyAttribute.MinValue) return (false, $"{(string.IsNullOrEmpty(propertyAttribute.Description) ? propertyInfo.Name : propertyAttribute.Description)}的值【{value}】要大于【{propertyAttribute.MinValue}】", data);
                        }
                    }

                    if (propertyAttribute.MaxValue < int.MaxValue)
                    {
                        if (value == null) return (false, $"{(string.IsNullOrEmpty(propertyAttribute.Description) ? propertyInfo.Name : propertyAttribute.Description)}不可为null", data);
                        if (propertyAttribute.IsContainMaxValue)
                        {
                            if (Convert.ToInt32(value.ToString()) >= propertyAttribute.MaxValue) return (false, $"{(string.IsNullOrEmpty(propertyAttribute.Description) ? propertyInfo.Name : propertyAttribute.Description)}的值【{value}】不可大于【{propertyAttribute.MaxValue}】", data);
                        }
                        else
                        {
                            if (Convert.ToInt32(value.ToString()) > propertyAttribute.MaxValue) return (false, $"{(string.IsNullOrEmpty(propertyAttribute.Description) ? propertyInfo.Name : propertyAttribute.Description)}的值【{value}】要小于【{propertyAttribute.MaxValue}】", data);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                return (false, $"数据验证异常,异常信息:{ex.Message}", data);
            }
            return (true, "验证成功", data);
        }
    }
}