//-----------------------------------------------------------------------
// <copyright file="GpsData.cs" company="bedug.com">
//     Copyright © 2012 Nils Hammar. All rights reserved.
// </copyright>
//-----------------------------------------------------------------------
/*
 * Software to access vehicle information via the OBD-II connector.
 * 
 * Copyright © 2012 Nils Hammar
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 * 
 * Alternative licensing is possible, see the licensing document.
 * 
 * The above text may not be removed or modified.
 */

namespace SharedObjects.DataLogging.Objects
{
    using System;
    using System.Globalization;

    /// <summary>
    /// Parsed data from GPS
    /// </summary>
    public class GpsData
    {
        /// <summary>
        /// Gets Timestamp for GPS data.
        /// </summary>
        public DateTime dateTime { get; private set; }

        /// <summary>
        /// Gets Latitude, positive values for northern hemisphere, negative for southern.
        /// </summary>
        public double lat { get; private set; }

        /// <summary>
        /// Gets Longitude, positive values for east of Greenwich, negative for west.
        /// </summary>
        public double lon { get; private set; }

        /// <summary>
        /// Gets Speed in km/h.
        /// </summary>
        public double speedKph { get; private set; }

        /// <summary>
        /// Gets Speed in mph.
        /// </summary>
        public double speedMph { get; private set; }

        /// <summary>
        /// Gets Current heading.
        /// </summary>
        public double heading { get; private set; }

        /// <summary>
        /// Gets Horizontal Dilution (precision).
        /// </summary>
        public double dilution { get; private set; }

        /// <summary>
        /// Gets Altitude value, error is about +/- 10m.
        /// </summary>
        public double altitude { get; private set; }

        /// <summary>
        /// Initializes a new instance of the <see cref="GpsData" /> class.
        /// </summary>
        /// <param name="time">Time string</param>
        /// <param name="date">Date string</param>
        /// <param name="lat">Latitude string</param>
        /// <param name="latNS">North/South string</param>
        /// <param name="lon">Longitude string</param>
        /// <param name="lonWE">West/East string</param>
        /// <param name="speedKnots">Speed string</param>
        /// <param name="heading">Heading string</param>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "2", Justification = "Reviewed.")]
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "4", Justification = "Reviewed.")]
        public GpsData(string time, string date, string lat, string latNS, string lon, string lonWE, string speedKnots, string heading)
        {
            string dateTimeStr = date + " " + time;

            this.dateTime = parseDateTime(dateTimeStr);

            // Translate from degrees and minutes to decimal location.
            double lat1 = safeParse(lat.Substring(0, 2)) + (safeParse(lat.Substring(2)) / 60.0);
            double lon1 = safeParse(lon.Substring(0, 3)) + (safeParse(lon.Substring(3)) / 60.0);

            if (latNS == "N")
            {
                this.lat = lat1;
            }
            else
            {
                this.lat = -lat1;
            }

            if (lonWE == "E")
            {
                this.lon = lon1;
            }
            else
            {
                this.lon = -lon1;
            }

            this.speedKph = 1.85200 * safeParse(speedKnots);
            this.speedMph = this.speedKph / 1.609344;

            this.heading = safeParse(heading);

            this.dilution = 0;
            this.altitude = 0;
        }

        /// <summary>
        /// Add information from the NMEA GGA entry.
        /// </summary>
        /// <param name="dilution">Horizontal dilution string</param>
        /// <param name="altitude">Altitude string</param>
        /// <param name="altitudeUnit">Altitude unit.</param>
        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1801:ReviewUnusedParameters", MessageId = "altitudeUnit", Justification = "Reviewed.")]
        public void addGGA(string dilution, string altitude, string altitudeUnit)
        {
            this.dilution = safeParse(dilution);
            this.altitude = safeParse(altitude);
        }

        /// <summary>
        /// Parse the DateTime string.
        /// </summary>
        /// <param name="dateTimeStr">String to parse.</param>
        /// <returns>Parsed value or DateTime.MinValue on failure to parse.</returns>
        private static DateTime parseDateTime(string dateTimeStr)
        {
            // DateTime dt = DateTime.Now;
            DateTime dt = DateTime.MinValue;

            try
            {
                dateTimeStr = dateTimeStr.Substring(0, 4) + "20" + dateTimeStr.Substring(4, 9);
                dt = DateTime.ParseExact(dateTimeStr, "ddMMyyyy HHmmss", CultureInfo.InvariantCulture);
            }
            catch
            {
            }

            return dt;
        }

        /// <summary>
        /// Parse a string to a double value.
        /// </summary>
        /// <param name="value">String to parse.</param>
        /// <returns>Parsed value or zero on failure.</returns>
        private static double safeParse(string value)
        {
            double v1 = 0;

            try
            {
                v1 = Convert.ToDouble(value, CultureInfo.InvariantCulture);
            }
            catch
            {
            }

            return v1;
        }
    }
}