using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using ExpandedSearchInfo.Sections;

namespace ExpandedSearchInfo.Providers {
    public class PastebinProvider : IProvider {
        private static readonly Regex Matcher = new(@"pb:(\S+)", RegexOptions.Compiled | RegexOptions.IgnoreCase);

        public bool ExtractsUris => true;

        public bool Matches(Uri uri) => uri.Host == "pastebin.com" && uri.AbsolutePath.Length > 1;

        public IEnumerable<Uri>? ExtractUris(int actorId, string info) {
            var matches = Matcher.Matches(info);
            return matches.Count == 0
                ? null
                : from Match match in matches select match.Groups[1].Value into id select new Uri($"https://pastebin.com/raw/{id}");
        }

        public async Task<ISearchInfoSection?> ExtractInfo(HttpResponseMessage response) {
            if (response.Content.Headers.ContentType.MediaType != "text/plain") {
                return null;
            }

            var id = response.RequestMessage.RequestUri.AbsolutePath.Split('/').LastOrDefault();

            var info = await response.Content.ReadAsStringAsync();

            return new TextSection($"Pastebin ({id})", response.RequestMessage.RequestUri, info);
        }
    }
}