using System;
using System.Globalization;
using static System.Web.Configuration.WebConfigurationManager;
using System.Web;

namespace CommonTool
{
    /// <summary>
    /// Cookie帮助类
    /// </summary>
    public class CookieHelper
    {
		public static CookieHelper Instance { get; } = new CookieHelper();

		/// <summary>
		/// 写cookie值
		/// </summary>
		/// <param name="strName">名称</param>
		/// <param name="strValue">值</param>
		public void WriteCookie(string strName, string strValue)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies[strName] ?? new HttpCookie(strName);
	        cookie.Value = strValue;
            HttpContext.Current.Response.AppendCookie(cookie);

        }

		/// <summary>
		/// 写cookie值
		/// </summary>
		/// <param name="strName">名称</param>
		/// <param name="strValue">值</param>
		/// <param name="expires">过期时间(分钟)</param>
		public void WriteCookie(string strName, string strValue, int expires)
        {
            HttpCookie cookie = HttpContext.Current.Request.Cookies[strName] ?? new HttpCookie(strName);
	        cookie.Value = strValue;
            cookie.Expires = DateTime.Now.AddMinutes(expires);
            HttpContext.Current.Response.AppendCookie(cookie);

        }

        /// <summary>
        /// 读cookie值
        /// </summary>
        /// <param name="strName">名称</param>
        /// <returns>cookie值</returns>
        public string GetCookie(string strName)
        {
            if (HttpContext.Current.Request.Cookies[strName] != null)
            {
                return HttpContext.Current.Request.Cookies[strName].Value;
            }
            return "";
        }

        /// <summary>
        /// Get cookie expiry date that was set in the cookie value 
        /// </summary>
        /// <param name="cookie"></param>
        /// <returns></returns>
        public DateTime GetExpirationDate(HttpCookie cookie)
        {
            if (String.IsNullOrEmpty(cookie.Value))
            {
                return DateTime.MinValue;
            }
            string strDateTime = cookie.Value.Substring(cookie.Value.IndexOf("|", StringComparison.Ordinal) + 1);
            return Convert.ToDateTime(strDateTime);
        }

        /// <summary>
        /// Set cookie value using the token and the expiry date
        /// </summary>
        /// <param name="value"></param>
        /// <param name="minutes"></param>
        /// <returns></returns>
        public string BuildCookueValue(string value, int minutes)
        {
            return $"{value}|{DateTime.Now.AddMinutes(minutes).ToString(CultureInfo.InvariantCulture)}";
        }

        /// <summary>
        /// Reads cookie value from the cookie
        /// </summary>
        /// <param name="cookie"></param>
        /// <returns></returns>
        public string GetCookieValue(HttpCookie cookie)
        {
	        if (cookie!=null)
	        {
		        if (String.IsNullOrEmpty(cookie.Value))
			        return cookie.Value;
		        return cookie.Value.Substring(0, cookie.Value.IndexOf("|", StringComparison.Ordinal));
			}
	        return null;

        }

	    public void DelCookie(string strName)
	    {
		    WriteCookie(strName, "", -10000);
	    }

	    public SysUserInfo GetSysUserInfo(string pcCookieName)
	    {
			string lcCookieName = pcCookieName?? AppSettings["SysUserInfoCookie"];
		    string lcCookieValue = GetCookieValue(HttpContext.Current.Request.Cookies[lcCookieName]);
		    try
		    {
				return JsonHelper.Instance.Deserialize<SysUserInfo>(SysSecurity.Decrypt(lcCookieValue));
			}
			catch 
		    {
				return null;
			}
		}
    }
}