// --------------------------------------------------------------------------------------------------------------------
// <copyright file="ImageCacheSection.cs" company="James South">
//   Copyright (c) James South.
//   Licensed under the Apache License, Version 2.0.
// </copyright>
// <summary>
//   Represents an image cache section within a configuration file.
// </summary>
// --------------------------------------------------------------------------------------------------------------------

namespace ImageProcessor.Web.Configuration
{
    using System.Configuration;
    using System.IO;
    using System.Xml;

    using ImageProcessor.Web.Extensions;
    using ImageProcessor.Web.Helpers;

    /// <summary>
    /// Represents an image cache section within a configuration file.
    /// </summary>
    public sealed class ImageCacheSection : ConfigurationSection
    {
        /// <summary>
        /// Gets or sets the virtual path of the cache folder.
        /// </summary>
        /// <value>The name of the cache folder.</value>
        [ConfigurationProperty("virtualPath", DefaultValue = "~/app_data/cache", IsRequired = true)]
        [StringValidator(MinLength = 3, MaxLength = 256)]
        public string VirtualPath
        {
            get
            {
                string virtualPath = (string)this["virtualPath"];

                return virtualPath.IsValidVirtualPathName() ? virtualPath : "~/app_data/cache";
            }

            set
            {
                this["virtualPath"] = value;
            }
        }

        /// <summary>
        /// Gets or sets the maximum number of days to store an image in the cache.
        /// </summary>
        /// <value>The maximum number of days to store an image in the cache.</value>
        /// <remarks>Defaults to 28 if not set.</remarks>
        [ConfigurationProperty("maxDays", DefaultValue = "365", IsRequired = false)]
        [IntegerValidator(ExcludeRange = false, MinValue = 0)]
        public int MaxDays
        {
            get
            {
                return (int)this["maxDays"];
            }

            set
            {
                this["maxDays"] = value;
            }
        }

        /// <summary>
        /// Retrieves the cache configuration section from the current application configuration. 
        /// </summary>
        /// <returns>The cache configuration section from the current application configuration.</returns>
        public static ImageCacheSection GetConfiguration()
        {
            ImageCacheSection imageCacheSection = ConfigurationManager.GetSection("imageProcessor/cache") as ImageCacheSection;

            if (imageCacheSection != null)
            {
                return imageCacheSection;
            }

            string section = ResourceHelpers.ResourceAsString("ImageProcessor.Web.Configuration.Resources.cache.config");
            XmlReader reader = new XmlTextReader(new StringReader(section));
            imageCacheSection = new ImageCacheSection();
            imageCacheSection.DeserializeSection(reader);

            return imageCacheSection;
        }
    }
}