using AS1024.GeoFeed.Models;
using System.Text;

namespace AS1024.GeoFeed.Core.Tools
{
    public static class GeoFeedTools
    {
        /// <summary>
        /// Returns a CSV string for a given GeoFeed retreived from various sources
        /// </summary>
        /// <param name="geoFeeds">GeoFeed returned from the source of truth</param>
        /// <param name="timeStamp">If a timestamp should be appended at the header</param>
        /// <param name="isCached">If the result is cached</param>
        /// <returns></returns>
        public static string ToGeoFeedCsv(this List<IPGeoFeed> geoFeeds, bool timeStamp = false, bool isCached = false)
        {
            StringBuilder csvContent = new();

            if (timeStamp)
                csvContent.AppendLine($"# GeoFeed generated on {DateTime.UtcNow:R}");

            if (isCached)
                csvContent.AppendLine($"# Geofeed data is returned from local in memory cache");

            foreach (IPGeoFeed feed in geoFeeds)
            {
                csvContent.AppendLine($"{feed.Prefix},{feed.GeolocCountry},{feed.GeolocRegion},{feed.GeolocCity},{feed.GeolocPostalCode}");
            }

            return csvContent.ToString();
        }
    }
}