using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using Xamarin.Forms;
using Xamarin.Forms.Xaml;

namespace Regla_Cramer
{
    [XamlCompilation(XamlCompilationOptions.Compile)]
    public partial class Resulltado : ContentPage
    {
        public Resulltado(double x1, double x2, double y1, double y2, double r1, double r2 )
        {
            InitializeComponent();

            try {
                //calculando viabilidad de la ecuación
                double e = Calcular(x1, x2, y1, y2);
                if (Math.Abs(e) < 1E-10)
                {
                    DisplayAlert("Error", "El sistema no tiene solución", "OK");
                }
                //calculando solución
                else
                {
                    double Dx = Calcular(r1, y1, r2, y2);
                    double Dy = Calcular(x1, r1, x2, r2);
                    e1.Text = $"   X1={x1}  Y1={y1} = {r1}";
                    e2.Text = $"   X2={x2}  Y2={y2} =  {r2}";
                    ds.Text = $"    D=({x1}*{y2})-({y2}*{x2})={e}";
                    double x = Dx / e;
                    double y = Dy / e;
                    dx.Text = $"Dx= ({r1}*{y2})-({y1}*{r2})={Dx}";
                    dy.Text = $"Dy= ({x1}*{r2})-({r1}*{x2})={Dy}";
                    //calculando resultados
                    xF.Text = $" X= {Dx}/{e}={x}";
                    yF.Text = $"Y= {Dy}/{e}={y}";

                }

            } catch (DivideByZeroException) {
                DisplayAlert("Error", "Division por 0", "OK");

            }catch (Exception ex)
            {
                DisplayAlert("Error", ex.Message, "OK");
            }

        }
        private double Calcular(double x1, double x2, double y1, double y2) {
            return (x1 * y2) - (y1 * x2);
        }

        private async void Button_Clicked(object sender, EventArgs e)
        {
            await Navigation.PopModalAsync();
        }
    }

}