using System.Net;

using decePubClient.Extensions;
using decePubClient.Models;
using decePubClient.Models.Mastodon;

using PrivaPub.ClientModels;

namespace decePubClient.Services
{
	/// <summary>
	/// The administrators' announcements as the current persona reads them (/api/v1/announcements): the ones shown now,
	/// dismissed one by one, and reacted to with a unicode emoji (eight different ones at most on each). Dismissals and
	/// reactions are the persona's own and never leave PrivaPub; the stream tells of new, changed and removed ones
	/// (StreamingService.Announced). The administrators write them through InstanceAdminService.
	/// </summary>
	public class AnnouncementService(IHttpService httpService, ILoggingService logger, CoalescingStringLocalizer localizer)
	{
		/// <summary>The announcements shown now, with whether the persona dismissed each.</summary>
		public async Task<List<Announcement>> List(CancellationToken cancellationToken = default)
		{
			using var response = await httpService.Get(APIs.Mastodon.GET_Announcements, cancellationToken: cancellationToken);
			if (response.IsSuccessStatusCode)
				return await response.MastodonReadFromJsonAsync<List<Announcement>>(cancellationToken) ?? [];

			var result = await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
			if (result.StatusCode is not (int)HttpStatusCode.Gone)
				await logger.ProcessWarning(result.ToString(localizer), $"{nameof(AnnouncementService)}.{nameof(List)}", cancellationToken);
			return [];
		}

		public async Task<WebResult> Dismiss(string announcementId, CancellationToken cancellationToken = default)
		{
			using var response = await httpService.Post(APIs.Mastodon.POST_M_DismissAnnouncement(announcementId), cancellationToken: cancellationToken);
			return response.IsSuccessStatusCode ? new WebResult() : await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
		}

		/// <summary>Adds the persona's reaction, or takes it back; PrivaPub refuses anything but one unicode emoji (422).</summary>
		public async Task<WebResult> React(string announcementId, string emoji, bool add, CancellationToken cancellationToken = default)
		{
			var route = APIs.Mastodon.M_AnnouncementReaction(announcementId, emoji);
			using var response = add
				? await httpService.Put(route, cancellationToken: cancellationToken)
				: await httpService.Delete(route, cancellationToken: cancellationToken);
			return response.IsSuccessStatusCode ? new WebResult() : await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);
		}
	}
}