using ampl;
using ampl.Entities;
using System;

namespace Examples
{
    public class FirstExample
    {
        public static int Main(string[] args)
        {
            string modelDirectory = ((args != null) && (args.Length > 0)) ? args[0]
            : "../../models";
            string solver = ((args != null) && (args.Length > 1)) ? args[1] : null;

            /*
            // If the AMPL installation directory is not in the system search path:
            ampl.Environment env = new ampl.Environment(
              "full path to the AMPL installation directory");
            // Create an AMPL instance
            using (AMPL a = new AMPL(env)) {}
            */

            // Create an AMPL instance
            using (AMPL a = new AMPL())
            {
                if (solver != null) a.SetOption("solver", solver);
                // Interpret the two files
                a.Read(System.IO.Path.Combine(modelDirectory, "diet/diet.mod"));
                a.ReadData(System.IO.Path.Combine(modelDirectory, "diet/diet.dat"));

                // Solve
                a.Solve();

                // Get objective entity by AMPL name
                Objective totalcost = a.GetObjective("Total_Cost");
                // Print it
                Console.WriteLine("ObjectiveInstance is: {0}", totalcost.Value);
                // Reassign data - specific instances
                Parameter cost = a.GetParameter("cost");
                cost.SetValues(ampl.Tuple.FromArray("BEEF", "HAM"),
                                    new double[] { 5.01, 4.55 });
                Console.WriteLine("Increased costs of beef and ham.");

                // ReSolve and display objective
                a.Solve();
                Console.WriteLine("Objective value: {0}", totalcost.Value);

                // Reassign data - all instances
                cost.SetValues(new double[] { 3, 5, 5, 6, 1, 2, 5.01, 4.55 });
                Console.WriteLine("Updated all costs");
                // ReSolve and display objective
                a.Solve();
                Console.WriteLine("New objective value: {0}", totalcost.Value);

                // Get the values of the variable Buy in a dataframe object
                Variable Buy = a.GetVariable("Buy");
                // Access a specific instance (method 1)
                Console.WriteLine(Buy.Get("FISH").ToString());
                // Access a specific instance (method 2)
                Console.WriteLine(Buy[new ampl.Tuple("FISH")].ToString());
                DataFrame df = Buy.GetValues();
                // Print them
                Console.WriteLine(df);

                // Get the values of an expression into a DataFrame object
                DataFrame df2 = a.GetData("{j in FOOD} 100*Buy[j]/Buy[j].ub");
                // Print them
                Console.WriteLine(df2);
            }
            return 0;
        }
    }
}