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/**
 * Copyright (c) 2019, RTE (http://www.rte-france.com)
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 * SPDX-License-Identifier: MPL-2.0
 */
package com.powsybl.openloadflow.ac.equations;

import com.powsybl.openloadflow.equations.AbstractElementEquationTerm;
import com.powsybl.openloadflow.network.LfBranch;
import com.powsybl.openloadflow.network.PiModel;

/**
 * @author Geoffroy Jamgotchian {@literal }
 */
abstract class AbstractBranchAcFlowEquationTerm extends AbstractElementEquationTerm {

    protected final double b1;
    protected final double b2;
    protected final double g1;
    protected final double g2;
    protected final double y;
    protected final double ksi;
    protected final double g12;
    protected final double b12;

    protected AbstractBranchAcFlowEquationTerm(LfBranch branch) {
        super(branch);
        PiModel piModel = branch.getPiModel();
        if (piModel.getR() == 0 && piModel.getX() == 0) {
            throw new IllegalArgumentException("Non impedant branch not supported: " + branch.getId());
        }
        b1 = piModel.getB1();
        b2 = piModel.getB2();
        g1 = piModel.getG1();
        g2 = piModel.getG2();
        y = piModel.getY();
        ksi = piModel.getKsi();
        // y12 = g12+j.b12 = 1/(r+j.x)
        g12 = piModel.getR() * y * y;
        b12 = -piModel.getX() * y * y;
    }
}