using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Store.Framework.Models
{
    public class Cookies : Dictionary<string, string>
    {
        private readonly string oldCookie;
        public Cookies(string cookie)
        {
            oldCookie = cookie;
            SplitCookie(oldCookie);
        }
       
        /// <summary>
        /// Cookie字符串
        /// </summary>
        public string CookieString
        {
            get
            {
                return GetCookieString();
            }
        }
      
        /// <summary>
        /// 拆分Cookie
        /// </summary>
        private void SplitCookie(string cookie)
        {
            this.Clear();
            Regex regCookie = new Regex("(?<key>.+?)=(?<value>.+?)(;|$)");
            if (regCookie.IsMatch(cookie))
            {
                MatchCollection matchs = regCookie.Matches(cookie);
                foreach (Match item in matchs)
                {
                    string key = item.Groups["key"].Value.Trim();
                    string value = item.Groups["value"].Value.Trim();
                    if (!ContainsKey(key))
                    {
                        this.Add(key.Trim(), value.Trim());
                    }
                }
            }
        }

        /// <summary>
        /// 获取指定值
        /// </summary>
        /// <param name="key"></param>
        /// <param name="defvalue">默认值</param>
        /// <returns></returns>
        public string GetValue(string key, string defvalue)
        {
            if (ContainsKey(key))
            {
                return this[key];
            }
            return defvalue;
        }
        /// <summary>
        /// 添加或修改
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void AddOrUpdate(string key, string value)
        {
            if (!this.ContainsKey(key))
            {
                Add(key, value);
            }
            else
            {
                this[key] = value;
            }
        }
        /// <summary>
        /// 获取Cookies字符串
        /// </summary>
        /// <returns></returns>
        public virtual string GetCookieString()
        {
            var list = this.Select(a => { return $"{a.Key}={a.Value}"; });
            return string.Join(";", list);
        }

        /// <summary>
        /// 隐式转换
        /// </summary>
        /// <param name="cookie"></param>
        public static implicit operator string (Cookies cookie)
        {
            return cookie.GetCookieString();
        }

    }
}