Example

using RuleEngineCore.Annotaion;
using RuleEngineCore.RuleEngine;
using RuleEngineCore.RuleEngine.Exceptions;
using System;

namespace RuleEngine.Example
{
    public class RuleEngineExample
    {
        public void run()
        {
            var facts = new Facts();
            facts.Put("Birthdate", new DateTime(1988, 11, 23));
            facts.Put("Gender", true);
            facts.Put("NationalId", "1234567890");

            try
            {
                Rule MyRule = new Rule(new IdentificationRule());
                MyRule.Execute(facts);
            }
            catch (RuleException ruleException)
            {
                Console.WriteLine(ruleException.Message);
                var inner = ruleException.InnerException;
                while (inner != null)
                {
                    Console.WriteLine(inner.Message);
                    inner = inner.InnerException;
                }
            }

        }
    }

    [Rule(NextRule = typeof(AccountRule))]
    public class IdentificationRule
    {
        [Action]
        public void UpdateUserInfo()
        {
            // Call a service or business to update something or do anything that you must to do
            Console.WriteLine("AccountRule Is passed too.");
        }

        [Condition("Birthdate,Gender", "If you are boy Your age must be more than 18 years old else more than 20 years old.")]
        public bool CheckAgeByGender(DateTime BirthDate, bool Gender)
        {
            return Gender ? CalcualteAge(BirthDate) > 18 : CalcualteAge(BirthDate) > 20;
        }

        private int CalcualteAge(DateTime BirthDate)
        {
            var today = DateTime.Today;
            var age = today.Year - BirthDate.Year;
            if (BirthDate.Date > today.AddYears(-age)) age--;
            return age;
        }

        [Condition("NationalId", "Your NationalId is not valid.")]
        public bool NationalIdIsValid(string NationalId)
        {
            return NationalId.Length == 10;
        }
    }

    [Rule]
    public class AccountRule
    {
        [Action]
        public void UpgradeAccount()
        {
            Console.WriteLine("AccountRule Is passed too.");
        }

        [Condition("AccountNo", "Your Account is not valid")]
        public bool IsAccountValid(int accountNo)
        {
            var accountInfo = GetAccountInfo(accountNo);
            return accountInfo.FullName.Length > 0;
        }

        private AccountInfo GetAccountInfo(int accountNo)
        {
            //Get From database or service or anywhere that you store your data
            return new AccountInfo()
            {
                AccountNo = accountNo,
                FirstName = "Navid",
                LastName = "Mehralizadeh",
            };
        }

    }

    public class AccountInfo
    {
        public int AccountNo { get; set; }
        public string FirstName { get; set; }
        public string LastName { get; set; }
        public string FullName
        {
            get
            {
                return $"{FirstName} {LastName}";
            }
        }
    }
}