// 
//     Kerbal Engineer Redux
// 
//     Copyright (C) 2016 CYBUTEK
// 
//     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/>.
//  
 
namespace KerbalEngineer.Flight.Readouts.Vessel
{
    using System;
    using Sections;
 
    public class SurfaceThrustToWeight : ReadoutModule
    {
        private string m_Actual = string.Empty;
        private double m_Gravity;
        private string m_Total = string.Empty;
 
        public SurfaceThrustToWeight()
        {
            Name = "Surface Thrust to Weight Ratio";
            Category = ReadoutCategory.GetCategory("Vessel");
            HelpString = "Shows the vessel's surface thrust to weight ratio.";
            IsDefault = true;
        }
 
        public override void Draw(SectionModule section)
        {
            if (FlightGlobals.currentMainBody == null || SimulationProcessor.LastStage == null ||
                !SimulationProcessor.ShowDetails)
            {
                return;
            }
 
            m_Gravity = FlightGlobals.currentMainBody.gravParameter / Math.Pow(FlightGlobals.currentMainBody.Radius, 2);
            m_Actual = (SimulationProcessor.LastStage.actualThrust / (SimulationProcessor.LastStage.totalMass * m_Gravity)).ToString("F2");
            m_Total = (SimulationProcessor.LastStage.thrust / (SimulationProcessor.LastStage.totalMass * m_Gravity)).ToString("F2");
            DrawLine("TWR (Surface)", m_Actual + " / " + m_Total, section.IsHud);
        }
 
        public override void Reset()
        {
            FlightEngineerCore.Instance.AddUpdatable(SimulationProcessor.Instance);
        }
 
        public override void Update()
        {
            SimulationProcessor.RequestUpdate();
        }
    }
}