using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using EasyDevCore.Common.Security;
using Microsoft.Extensions.Configuration;

namespace EasyDevCore.Configuration
{
    /// <summary>
    /// 
    /// </summary>
    /// <seealso cref="Microsoft.Extensions.Configuration.IConfigurationSource" />
    public class ProtectDataConfigurationSource : IConfigurationSource
    {
        private readonly IConfigurationRoot _configurationRoot;

        /// <summary>
        /// The decrypt function
        /// </summary>
        private readonly Func<string, string, string> _decryptFunc;
        private readonly Func<string, string, string> _encryptFunc;

        /// <summary>
        /// Initializes a new instance of the <see cref="ProtectDataConfigurationSource" /> class.
        /// </summary>
        /// <param name="configurationRoot">The configuration root.</param>
        /// <param name="decryptFunc">The decrypt function.</param>
        /// <param name="encryptFunc">The encrypt function.</param>
        public ProtectDataConfigurationSource(IConfigurationRoot configurationRoot, Func<string, string, string> encryptFunc, Func<string, string, string> decryptFunc)
        {
            _configurationRoot = configurationRoot;
            _decryptFunc = decryptFunc;
            _encryptFunc = encryptFunc;
        }

        /// <summary>
        /// Builds the <see cref="T:Microsoft.Extensions.Configuration.IConfigurationProvider" /> for this source.
        /// </summary>
        /// <param name="builder">The <see cref="T:Microsoft.Extensions.Configuration.IConfigurationBuilder" />.</param>
        /// <returns>
        /// An <see cref="T:Microsoft.Extensions.Configuration.IConfigurationProvider" />
        /// </returns>
        public IConfigurationProvider Build(IConfigurationBuilder builder)
        {
            return new ProtectDataConfigurationProvider(_configurationRoot, _decryptFunc, _encryptFunc);
        }
    }
}