//-----------------------------------------------------------------------
// <copyright file="ObjectMaterializer.cs" company="Deltares">
//  Copyright (c) 2009 Deltares. All rights reserved.
// </copyright>
// <author>Barry Faassen</author>
// <email>barry.faassen@deltares.nl</email>
// <date>25-5-2009</date>
// <summary>The object materializer can set property values 
//  for a given type. Values can be set through action callback lambda 
//  expressions as an alternative of using reflection.
// </summary>
//-----------------------------------------------------------------------
namespace Deltares.Dam.Data
{
    using System;
    using System.Collections.Generic;
    using System.Linq;

    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; }
        }
    }
}