// 
//     Kerbal Engineer Redux
// 
//     Copyright (C) 2014 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/>.
// 
 
#region Using Directives
 
using System.Linq;
 
using KerbalEngineer.Flight.Sections;
 
#endregion
 
namespace KerbalEngineer.Flight.Readouts.Vessel
{
    public class IntakeAirDemandSupply : ReadoutModule
    {
        #region Fields
 
        private double demand;
        private double supply;
 
        #endregion
 
        #region Constructors
 
        public IntakeAirDemandSupply()
        {
            this.Name = "Intake Air (D/S)";
            this.Category = ReadoutCategory.GetCategory("Vessel");
            this.HelpString = "Displays the Ration between required and available Intake Air.";
            this.IsDefault = false;
        }
 
        #endregion
 
        #region Methods: public
 
        public static double GetDemand()
        {
            var demand = 0.0;
            foreach (var part in FlightGlobals.ActiveVessel.Parts)
            {
                for (int i = 0; i < part.Modules.Count; i++)
                {
                    PartModule partmod = part.Modules[i];
                    var engine = partmod as ModuleEngines;
                    if (engine != null && engine.isOperational)
                    {
                        demand += engine.propellants
                            .Where(p => p.name == "IntakeAir")
                            .Sum(p => p.currentRequirement);
                    }
                }
            }
            return demand;
        }
 
        public static double GetSupply()
        {
            return FlightGlobals.ActiveVessel.Parts
                .Where(p => p.Resources.Contains("IntakeAir"))
                .Sum(p => p.Resources["IntakeAir"].amount);
        }
 
        public override void Draw(SectionModule section)
        {
            this.DrawLine(this.demand.ToString("F4") + " / " + this.supply.ToString("F4"), section.IsHud);
        }
 
        public override void Update()
        {
            this.demand = GetDemand();
            this.supply = GetSupply();
        }
 
        #endregion
    }
}