using System;
using System.Linq;

namespace InABox.Core
{
    [AttributeUsage(AttributeTargets.Property, AllowMultiple = true)]
    public class SecurityAttribute : Attribute
    {
        public Type SecurityDescriptor { get; set; }

        /// <summary>
        /// If the user does not have the security token, this property will be <see cref="Visible.Visible"/> if <see langword="true"/>
        /// or <see cref="Visible.Hidden"/> if <see langword="false"/>. The default is <see langword="false"/>.
        /// </summary>
        public bool Visible { get; set; } = false;

        /// <summary>
        /// If the user does not have the security token, this property will be <see cref="Editable.Editable"/> if <see langword="true"/>
        /// or <see cref="Editable.Hidden"/> if <see langword="false"/>. The default is <see langword="false"/>.
        /// </summary>
        public bool Editable { get; set; } = false;

        private SecurityAttribute() { }

        public SecurityAttribute(Type securityDescriptor)
        {
            if (!securityDescriptor.GetInterfaces().Contains(typeof(ISecurityDescriptor)))
                throw new Exception(securityDescriptor.EntityName() + " is not a valid security descriptor!");
            SecurityDescriptor = securityDescriptor;
        }

        public virtual SecurityAttribute Clone()
        {
            var result = new SecurityAttribute(SecurityDescriptor);
            result.SecurityDescriptor = SecurityDescriptor;
            return result;
        }
    }

    public class CanViewAttribute : SecurityAttribute
    {
        public CanViewAttribute(Type TEntity): base(
            typeof(AutoSecurityDescriptor<,>).MakeGenericType(TEntity, typeof(CanView<>).MakeGenericType(TEntity)))
        {
        }
    }

    public class CanEditAttribute : SecurityAttribute
    {
        public CanEditAttribute(Type TEntity) : base(
            typeof(AutoSecurityDescriptor<,>).MakeGenericType(TEntity, typeof(CanEdit<>).MakeGenericType(TEntity)))
        {

        }
    }

    public class CanDeleteAttribute : SecurityAttribute
    {
        public CanDeleteAttribute(Type TEntity) : base(
            typeof(AutoSecurityDescriptor<,>).MakeGenericType(TEntity, typeof(CanDelete<>).MakeGenericType(TEntity)))
        {

        }
    }
}