/**
 * DESCRIPTION OF THE FILE
 *
 * @author Michal Kravčenko
 * @date 4.9.18 -
 */

#include "ExprtkWrapper.h"


ExprtkWrapper::ExprtkWrapper( std::string expression_string ) {

    this->expression_str = expression_string;

    this->symbol_table = new symbol_table_t( );

    this->symbol_table->add_variable("x", this->x);
    this->symbol_table->add_variable("y", this->y);
    this->symbol_table->add_variable("z", this->z);
    this->symbol_table->add_variable("t", this->t);
    this->symbol_table->add_variable("f", this->z);

    this->expression = new expression_t( );
    this->expression->register_symbol_table( *this->symbol_table );

    this->parser = new parser_t( );
    parser->compile(this->expression_str, *this->expression );
}


ExprtkWrapper::~ExprtkWrapper() {

    if( this->expression ){
        delete this->expression;
        this->expression = nullptr;
    }

    if( this->symbol_table ){
        delete this->symbol_table;
        this->symbol_table = nullptr;
    }

    if( this->parser ){
        delete this->parser;
        this->parser = nullptr;
    }

}

double ExprtkWrapper::eval(double x1, double x2, double x3, double x4) {

    this->x = x1;
    this->y = x2;
    this->z = x3;
    this->t = x4;

    return this->expression->value();
}

double ExprtkWrapper::eval(std::vector<double> &p) {


    if(p.size() > 0){
        this->x = p[0];
    }
    if(p.size() > 1){
        this->y = p[1];
    }
    if(p.size() > 2){
        this->z = p[2];
    }
    if(p.size() > 3){
        this->t = p[3];
    }

    double result = this->expression->value();

    return result;
}