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

namespace EasyDevCore.Configuration
{
    /// <summary>
    /// 
    /// </summary>
    /// <seealso cref="Microsoft.Extensions.Configuration.IConfigurationSource" />
    public class SubstitutingConfigurationSource : IConfigurationSource
    {
        /// <summary>
        /// The configuration root
        /// </summary>
        private readonly IConfigurationRoot _configurationRoot;
        /// <summary>
        /// The constant section
        /// </summary>
        private readonly string _variablesSection;

        /// <summary>
        /// Initializes a new instance of the <see cref="SubstitutingConfigurationSource"/> class.
        /// </summary>
        /// <param name="configurationRoot">The configuration root.</param>
        /// <param name="variablesSection">The variables section.</param>
        public SubstitutingConfigurationSource(IConfigurationRoot configurationRoot, string variablesSection)
        {
            _configurationRoot = configurationRoot;
            _variablesSection = variablesSection;
        }

        /// <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 SubstitutingConfigurationProvider(_configurationRoot, _variablesSection);
        }
    }
}