module.exports = Solver;

/**
 * Constraint equation solver base class.
 * @class Solver
 * @constructor
 * @author schteppe / https://github.com/schteppe
 */
function Solver(){
    /**
     * All equations to be solved
     * @property {Array} equations
     */
    this.equations = [];
}

/**
 * Should be implemented in subclasses!
 * @method solve
 * @param  {Number} dt
 * @param  {World} world
 */
Solver.prototype.solve = function(dt,world){
    // Should return the number of iterations done!
    return 0;
};

/**
 * Add an equation
 * @method addEquation
 * @param {Equation} eq
 */
Solver.prototype.addEquation = function(eq){
    if (eq.enabled) {
        this.equations.push(eq);
    }
};

/**
 * Remove an equation
 * @method removeEquation
 * @param {Equation} eq
 */
Solver.prototype.removeEquation = function(eq){
    var eqs = this.equations;
    var i = eqs.indexOf(eq);
    if(i !== -1){
        eqs.splice(i,1);
    }
};

/**
 * Add all equations
 * @method removeAllEquations
 */
Solver.prototype.removeAllEquations = function(){
    this.equations.length = 0;
};