import { Result } from "../util/result";
import { RectangularStructure } from "./rectangular_structure";
import { RectangularStructureParams } from "./rectangular_structure_params";
import { Structure, StructureFlowMode, StructureFlowRegime } from "./structure";

export { RectangularStructureParams };

/**
 * Equation de la fente noyé
 * d'après Larinier, M., Travade, F., Porcher, J.-P., Gosset, C., 1992.
 * Passes à poissons : expertise et conception des ouvrages de franchissement
 */
export class StructureWeirSubmergedLarinier extends RectangularStructure {
    /**
     * Calcul analytique Q = f(Cd, L, h1, h2, W) seuil dénoyé
     * @param sVarCalc Variable à calculer (doit être "Q")
     */
    public Equation(sVarCalc: string): Result {
        Structure.CheckEquation(sVarCalc);
        const data = this.getResultData();

        const v = this.prms.Cd.v * this.prms.L.v * Structure.R2G
            * this.prms.h1.v * Math.sqrt(this.prms.h1.v - this.prms.h2.v);

        return new Result(v, data);
    }

    protected getFlowRegime() {
        return StructureFlowRegime.SUBMERGED;
    }

    protected getFlowMode() {
        return StructureFlowMode.WEIR;
    }
}