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

namespace CSS_Solution.Request
{
    internal class Get_Index : IRequest
    {
        Task task;
        readonly int id;
        string rnd = "";
        string? url;
        Action<int> success;
        Action<int, Exception, Get_Index_Result?> failed;
        List<KeyValuePair<string, string>> respond_cookie = new List<KeyValuePair<string, string>>();
        public Request_Type request_type { get; } = Request_Type.get_index;
        public Get_Index(int _id, Action<int> _success, Action<int, Exception, Get_Index_Result?> _failed)
        {
            id = _id;
            success = _success;
            failed = _failed;
            url = Initialize.configuration?.GetSection("login_index").Value;
            if (url == null || url.Length == 0)
                throw new ConfigurationErrorsException("Can't get login_index url from AppSettings.json");
            task = new Task(async () =>
            {
                try
                {
                    HttpClient client = Initialize.hc_pool.GetHttpClient(request_type);
                    HttpRequestMessage request_Message = new HttpRequestMessage(HttpMethod.Get, url);
                    List<(string, string)> request_header = Settings.get_Index_Header.Get_header();
                    foreach (var (key, value) in request_header)
                        request_Message.Headers.Add(key, value);
                    HttpResponseMessage message = await client.SendAsync(request_Message);
                    message.EnsureSuccessStatusCode();
                    HtmlDocument htmlDoc = new HtmlDocument();
                    htmlDoc.LoadHtml(await message.Content.ReadAsStringAsync());
                    var node = htmlDoc.DocumentNode.SelectSingleNode("//input[@id='rnd']");
                    rnd = node.GetAttributeValue("value", "");
                    foreach (var header in message.Headers)
                    {
                        if (header.Key != "Set-Cookie")
                            continue;
                        foreach (var item in header.Value)
                            foreach (var item1 in item.Split("; "))
                            {
                                string[] Key_ValuePair = item1.Split('=');
                                respond_cookie.Add(new KeyValuePair<string, string>(Key_ValuePair[0], Key_ValuePair[1]));
                            }
                    }
                }
                catch (Exception ex)
                {
                    failed(id, ex, null);
                }
                success(id);
            });
        }
        public List<KeyValuePair<string, string>>? Get_cookie()
        {
            if (!task.IsCompleted)
                return null;
            return respond_cookie;
        }
        public string? Get_rnd() => rnd;
        public int Get_Id() => id;
        public Task Run()
        {
            task.Start();
            return task;
        }

    }
}