using System.Collections.Generic;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Json;
using System.Threading;
using System.Threading.Tasks;
using NadekoBot.Extensions;

namespace NadekoBot.Modules.Nsfw.Common
{
    public class E621ImageDownloader : ImageDownloader<E621Object>
    {
        public E621ImageDownloader(HttpClient http) : base(Booru.E621, http)
        {
        }

        public override async Task<List<E621Object>> DownloadImagesAsync(string[] tags, int page, bool isExplicit = false, CancellationToken cancel = default)
        {
            var tagString = ImageDownloaderHelper.GetTagString(tags, isExplicit: isExplicit);
            var uri = $"https://e621.net/posts.json?limit=32&tags={tagString}&page={page}";
            using var req = new HttpRequestMessage(HttpMethod.Get, uri);
            req.Headers.AddFakeHeaders();
            using var res = await _http.SendAsync(req, cancel).ConfigureAwait(false);
            res.EnsureSuccessStatusCode();

            var data = await res.Content.ReadFromJsonAsync<E621Response>(_serializerOptions, cancel).ConfigureAwait(false);
            if (data?.Posts is null)
                return new();

            return data.Posts
                .Where(x => !string.IsNullOrWhiteSpace(x.File?.Url))
                .ToList();
        }
    }
}