// ==========================================================================
//  Squidex Headless CMS
// ==========================================================================
//  Copyright (c) Squidex UG (haftungsbeschraenkt)
//  All rights reserved. Licensed under the MIT license.
// ==========================================================================

using System.Collections.Generic;
using System.Net.Http;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using Squidex.Domain.Apps.Core.HandleRules;
using Squidex.Domain.Apps.Core.Rules.EnrichedEvents;

namespace Squidex.Extensions.Actions.Discourse
{
    public sealed class DiscourseActionHandler : RuleActionHandler<DiscourseAction, DiscourseJob>
    {
        private const string DescriptionCreatePost = "Create discourse Post";
        private const string DescriptionCreateTopic = "Create discourse Topic";

        private readonly IHttpClientFactory httpClientFactory;

        public DiscourseActionHandler(RuleEventFormatter formatter, IHttpClientFactory httpClientFactory)
            : base(formatter)
        {
            this.httpClientFactory = httpClientFactory;
        }

        protected override async Task<(string Description, DiscourseJob Data)> CreateJobAsync(EnrichedEvent @event, DiscourseAction action)
        {
            var url = $"{action.Url.ToString().TrimEnd('/')}/posts.json?api_key={action.ApiKey}&api_username={action.ApiUsername}";

            var json = new Dictionary<string, object>
            {
                ["title"] = await FormatAsync(action.Title, @event)
            };

            if (action.Topic != null)
            {
                json.Add("topic_id", action.Topic.Value);
            }

            if (action.Category != null)
            {
                json.Add("category", action.Category.Value);
            }

            json["raw"] = await FormatAsync(action.Text, @event);

            var requestBody = ToJson(json);

            var ruleJob = new DiscourseJob
            {
                RequestUrl = url,
                RequestBody = requestBody
            };

            var description =
                action.Topic != null ?
                DescriptionCreateTopic :
                DescriptionCreatePost;

            return (description, ruleJob);
        }

        protected override async Task<Result> ExecuteJobAsync(DiscourseJob job,
            CancellationToken ct = default)
        {
            using (var httpClient = httpClientFactory.CreateClient())
            {
                using (var request = new HttpRequestMessage(HttpMethod.Post, job.RequestUrl)
                {
                    Content = new StringContent(job.RequestBody, Encoding.UTF8, "application/json")
                })
                {
                    return await httpClient.OneWayRequestAsync(request, job.RequestBody, ct);
                }
            }
        }
    }

    public sealed class DiscourseJob
    {
        public string RequestUrl { get; set; }

        public string RequestBody { get; set; }
    }
}