using System.Net;

using collAnon.Client.Services;

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

using PrivaPub.ClientModels;

namespace decePubClient.Services
{
	/// <summary>
	/// The current persona's filters (PrivaPub's /api/v2/filters): made, changed with their keywords, given posts, and
	/// deleted. What they match comes on each status (Status.Filtered); the card applies it. Lists come back empty on
	/// failure; nothing throws.
	/// </summary>
	public class FilterService(IHttpService httpService, ILoggingService logger, CoalescingStringLocalizer localizer)
	{
		public async Task<List<Filter>> All(CancellationToken cancellationToken = default)
		{
			using var response = await httpService.Get(APIs.Mastodon.GET_Filters, cancellationToken: cancellationToken);
			if (response.IsSuccessStatusCode)
				return await response.MastodonReadFromJsonAsync<List<Filter>>(cancellationToken) ?? [];

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

		/// <summary>Makes the filter when filterId is null, or changes it; Data is the filter as PrivaPub keeps it.</summary>
		public async Task<WebResult> Save(string filterId, FilterForm form, CancellationToken cancellationToken = default)
		{
			using var response = filterId is null
				? await httpService.Post(APIs.Mastodon.POST_Filter, form, cancellationToken: cancellationToken)
				: await httpService.Put(APIs.Mastodon.PUT_M_Filter(filterId), form, cancellationToken: cancellationToken);
			if (!response.IsSuccessStatusCode)
				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);

			return new WebResult { Data = await response.MastodonReadFromJsonAsync<Filter>(cancellationToken) };
		}

		public async Task<WebResult> Delete(string filterId, CancellationToken cancellationToken = default)
		{
			using var response = await httpService.Delete(APIs.Mastodon.DELETE_M_Filter(filterId), cancellationToken: cancellationToken);
			if (!response.IsSuccessStatusCode)
				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);

			return new WebResult();
		}

		/// <summary>Adds a post to the filter; Data is the FilterStatus.</summary>
		public async Task<WebResult> AddStatus(string filterId, string statusId, CancellationToken cancellationToken = default)
		{
			using var response = await httpService.Post(APIs.Mastodon.POST_M_FilterStatus(filterId), new[] { new KeyValuePair<string, string>("status_id", statusId) },
				cancellationToken: cancellationToken);
			if (!response.IsSuccessStatusCode)
				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);

			return new WebResult { Data = await response.MastodonReadFromJsonAsync<FilterStatus>(cancellationToken) };
		}

		public async Task<WebResult> RemoveStatus(string filterStatusId, CancellationToken cancellationToken = default)
		{
			using var response = await httpService.Delete(APIs.Mastodon.DELETE_M_FilterStatus(filterStatusId), cancellationToken: cancellationToken);
			if (!response.IsSuccessStatusCode)
				return await response.Content.ReadWebResult(response.StatusCode, localizer, cancellationToken);

			return new WebResult();
		}
	}
}