using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;

namespace TEAMModelOS.SDK
{
    public static class ValidatorHelper
    {
        public static ValidResult Valid(this Object obj) {
            ValidResult result = new ValidResult();
            var list = obj as IEnumerable;
            if (list != null)
            {
                foreach (var item in list)
                {
                    var validationContext = new ValidationContext(item);
                    var validationResults = new List<ValidationResult>();
                    var isItemValid = Validator.TryValidateObject(item, validationContext, validationResults, true);
                    result.isVaild = isItemValid;
                }
            }
            else {
                try
                {
                    var context = new ValidationContext(obj, null, null);
                    var results = new List<ValidationResult>();
                    if (Validator.TryValidateObject(obj, context, results, true))
                    {
                        result.isVaild = true;
                    }
                    else
                    {
                        List<(string msg, string name)> error = new List<(string msg, string name)>();
                        foreach (var validationResult in results)
                        {
                            if (validationResult.MemberNames != null && validationResult.MemberNames.Count() > 0)
                            {
                                validationResult.MemberNames.ToList().ForEach(x => {
                                    error.Add((validationResult.ErrorMessage, x));
                                });
                            }
                        }
                        result.errors = new Dictionary<string, IEnumerable<string>>();
                        error.GroupBy(x => x.name).ToList().ForEach(z => {
                            result.errors.Add(z.Key, z.ToList().Select(x => x.msg));
                        });
                    }
                }
                catch (Exception ex)
                {
                    result.isVaild = false;
                    result.errors = new Dictionary<string, IEnumerable<string>>();
                    result.errors.Add("InternalError", new List<string> { ex.Message });
                }
            }
            
            return result;
        }

        
    }
    public class ValidResult
    {
        public string traceId { get; set; } = Guid.NewGuid().ToString();
        public string type { get; set; } = "https://tools.ietf.org/html/rfc7231#section-6.5.1";
        public string title { get; set; } = "One or more validation errors occurred.";
        public int status { get; set; } = 400;
        public bool isVaild { get; set; }
        public Dictionary<string, IEnumerable<string>> errors { get; set; }
    }
}