package bulatski;

public class ChemberlinSolver {

    private double alpha;
    private double beta;
    private double gamma;

    private double a;
    private double b;
    private double c;

    public ChemberlinSolver(double alpha,
                            double beta,
                            double gamma,
                            double a,
                            double b,
                            double c) {
        this.alpha = alpha;
        this.beta = beta;
        this.gamma = gamma;

        this.a = a;
        this.b = b;
        this.c = c;
    }

    private boolean validateParams() {
        return beta > 0 && gamma > 0 && alpha > 0 && c > 0 && b > 0 && b <= alpha && a >= 0;
    }

    private double solveQ1() {
        return (-2 * (beta + c) +
                Math.sqrt(4 * Math.pow(beta + c, 2) + 12 * gamma * (alpha - b))) /
                (6 * gamma);
    }

    private double solvePm(double q1) {
        return alpha - beta * q1 - gamma * Math.pow(q1, 2);
    }

    private double solveR(double alpha1) {
        return ((- beta - c) + Math.sqrt(Math.pow(beta + c, 2) + 3 * (alpha1 - b))) /
                ((-beta - c) + Math.sqrt(Math.pow(beta + c, 2) + 3 * (alpha - b)));
    }

    private double solveK(double r) {
        return r / (1 + r);
    }

    private double solveQ0(double r) {
        return ((- beta * (1 + r) - c) +
                Math.sqrt(Math.pow(beta * (1 + r) + c, 2) + 3 * gamma * Math.pow(1 + r, 2) * (alpha - b))) /
                (3 * gamma * (1 + r));
    }

    public void solve() {
        if(!validateParams()) {
            System.out.println("Wrong attribute's set.");
            return;
        }
        double q1First = solveQ1();
        System.out.println("Q1 = " + q1First);
        double alpha1 = solvePm(q1First);
        System.out.println("Alpha1 = " + alpha1);
        double r = solveR(alpha1);
        System.out.println("r = " + r);
        double k = solveK(r);
        System.out.println("k = " + k);
        double q0 = solveQ0(r);
        System.out.println("q0 = " + q0);
        double q2 = q0 * k;
        System.out.println("q2 = " + q2);
        double q1 = q0 * (1 - k);
        System.out.println("q1 = " + q1);
    }

}