// Copyright (C) Stichting Deltares 2018. All rights reserved.
//
// This file is part of the application DAM - UI.
//
// DAM - UI is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// All names, logos, and references to "Deltares" are registered trademarks of
// Stichting Deltares and remain full property of Stichting Deltares at all times.
// All rights reserved.

using System;
using System.Collections.Generic;
using System.Linq;

namespace Deltares.Dam.Data
{

    public class ObjectMaterializer<T>
    {
        private struct SetterInfo
        {
            public Action<T, string> Function;
            public bool Required;
        }

        /// <summary>
        /// Holds the property setter actions with the name as the key of the setter
        /// </summary>
        private readonly Dictionary<string, SetterInfo> dict;
        
        /// <summary>
        /// Holds the list of actions in a list so it is accessible with an index
        /// </summary>
        private List<SetterInfo> setters;

        public ObjectMaterializer()
        {
            this.dict = new Dictionary<string, SetterInfo>();
            this.setters = new List<SetterInfo>();
        }


        /// <summary>
        /// Adds a new property setter
        /// </summary>
        /// <param name="setterName">The name of the setter</param>
        /// <param name="func">The setter lambda expression</param>
        /// <param name="required"></param>
        public void Add(string setterName, Action<T, string> func, bool required)
        {
            SetterInfo columnInfo = new SetterInfo() { Function = func, Required = required };
            dict.Add(setterName, columnInfo);
        }

        public void Add(string setterName, Action<T, string> func)
        {
            Add(setterName, func, true);
        }

        /// <summary>
        /// Removes a property setter
        /// </summary>
        /// <param name="setterName">The name of the setter</param>
        public void Remove(string setterName)
        {
            dict.Remove(setterName);
            setters = dict.Values.ToList();
        }

        /// <summary>
        /// Returns the mapped keys
        /// </summary>
        public IEnumerable<string> MappingKeys
        {
            get { return this.dict.Keys; }
        }

        public bool IsRequired(string setterName)
        {
            return this.dict.ContainsKey(setterName) && this.dict[setterName].Required;
        }

        /// <summary>
        /// Gets the setter action by index
        /// </summary>
        /// <param name="index">The index of the property set expression</param>
        /// <returns></returns>
        public Action<T, string> this[int index]
        {
            get
            {
                if (setters == null)
                    setters = dict.Values.ToList();
                return setters[index].Function;
            }
        }

        /// <summary>
        /// Gets the setter action by name
        /// </summary>
        /// <param name="name">The name of the property set expression</param>
        /// <returns></returns>
        public Action<T, string> this[string name]
        {
            get
            {
                return dict[name].Function;
            }
        }

        /// <summary>
        /// Gets the number of setter items
        /// </summary>
        public int Count
        {
            get { return dict.Count; }
        }
    }
}