using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Http.Headers;
using Newtonsoft.Json;
using System.Diagnostics;
using System.Net;
using Pilz.Networking.CloudProviders.Nextcloud.OCS.APIs;

namespace Pilz.Networking.CloudProviders.Nextcloud.OCS
{
    public class OcsApi : IDisposable
    {
        public event GetOcsApiAuthCredentailsEventHandler? GetOcsApiAuthCredentails;

        private readonly HttpClient client = new();

        public string BaseUrl { get; set; } = string.Empty;

        public OcsApiLoginFlowV2 LoginFlowV2 { get; init; }
        public OcsApiCore Core { get; init; }
        public OcsApiCloud Cloud { get; init; }

        public OcsApi()
        {
            LoginFlowV2 = new(this);
            Core = new(this);
            Cloud = new(this);
        }

        public string BuildFullUrl(OcsApiUrlPath path)
        {
            return BaseUrl + path;
        }

        public Task<TResponse?> MakeRequestJson<TResponse>(HttpMethod httpMethod, OcsApiUrlPath url, bool useAuthentication = true, Dictionary<string, string>? parameters = null)
        {
            return MakeRequestJson<TResponse>(httpMethod, BuildFullUrl(url), useAuthentication: useAuthentication, parameters: parameters);
        }

        public Task<HttpResponseMessage> MakeRequest(HttpMethod httpMethod, OcsApiUrlPath url, bool useAuthentication = true, Dictionary<string, string>? parameters = null)
        {
            return MakeRequest(httpMethod, BuildFullUrl(url), useAuthentication: useAuthentication, parameters: parameters);
        }

        public async Task<TResponse?> MakeRequestJson<TResponse>(HttpMethod httpMethod, string url, bool useAuthentication = true, Dictionary<string, string>? parameters = null)
        {
            using var responseInit = await MakeRequest(httpMethod, url, useAuthentication: useAuthentication, parameters: parameters);

            if (responseInit != null)
            {
                var bodyInit = await responseInit.Content.ReadAsStringAsync();
                return JsonConvert.DeserializeObject<TResponse>(bodyInit);
            }

            return default;
        }

        public async Task<HttpResponseMessage> MakeRequest(HttpMethod httpMethod, string url, bool useAuthentication = true, Dictionary<string, string>? parameters = null)
        {
            OcsApiAuthCredentials? authentication;
            string @params;

            // Get authentication
            if (useAuthentication)
            {
                var args = new GetOcsApiAuthCredentailsEventArgs();
                GetOcsApiAuthCredentails?.Invoke(this, args);
                authentication = args.Credentials;
            }
            else
                authentication = null;

            // Parse params
            if (parameters != null)
                @params = "?" + string.Join(",", parameters.Select(p => $"{p.Key}={p.Value}"));
            else
                @params = string.Empty;

            // Send request
            var request = new HttpRequestMessage
            {
                Method = httpMethod ?? HttpMethod.Post,
                RequestUri = new Uri(url + @params),
                Headers =
                {
                    { "Accept", "application/json" },
                    { "OCS-APIREQUEST", "true" },
                    { "Authorization", authentication.ToBasicAuth() }
                },
            };

            return await client.SendAsync(request);
        }

        public void Dispose()
        {
            client.Dispose();
            GC.SuppressFinalize(this);
        }
    }
}