using Centron.Api.docuFORM.Models;
using System;
using System.Collections.Generic;
using System.Net;
using System.Reflection;
using System.Text;
using System.Text.Json.Serialization;

namespace Centron.Api.docuFORM.Helper
{
    public static class DocuFormRequestHelper
    {
        public static string CreateAuthorizationRequestURI(AuthCodeRequest authCodeRequest, string? baseUriToAdd = null)
        {
            var parameters = RequestToParameterString(authCodeRequest);
            var endPointAndParameters = DocuFormRestApiConstants._endpointAuthCode + "?" + parameters;
            var baseUri = baseUriToAdd != null
                ? new Uri(baseUriToAdd)
                : null;

            return baseUri != null
                ? new Uri(baseUri, endPointAndParameters).ToString()
                : endPointAndParameters;
        }

        public static string RequestToParameterString<T>(T request)
        {
            var parameters = RequestToParameters(request);
            var parameterString = string.Join("&", parameters.Select(f => $"{WebUtility.UrlEncode(f.Key)}={WebUtility.UrlEncode(f.Value)}"));

            return parameterString;
        }

        public static Dictionary<string, string> RequestToParameters<T>(T request, bool removeParameterWithoutValue = true)
        {
            var dict = new Dictionary<string, string>();
            var props = typeof(T).GetProperties(BindingFlags.Public | BindingFlags.Instance);
            
            foreach (var prop in props)
            {
                var attr = prop.GetCustomAttribute<JsonPropertyNameAttribute>();
                var key = attr?.Name ?? prop.Name;
                var value = prop.GetValue(request)?.ToString();

                if(removeParameterWithoutValue && string.IsNullOrWhiteSpace(value))
                    continue;

                dict[key] = value ?? string.Empty;
            }

            return dict;
        }

        public static string CreateRedirectURI(int? portNumber = null)
        {
            var uriBuilder = new UriBuilder(DocuFormRestApiConstants._redirectURI);

            uriBuilder.Port = portNumber.HasValue && portNumber.Value > 0
                ? portNumber.Value
                : -1;

            var uri = uriBuilder.ToString();

            while(uri.EndsWith("/"))
                uri = uri.Substring(0, uri.Length - 1);

            return uri;
        }
    }
}