Barelydead / oop-chess

"use strict";

/**

 * Class with Pawn logic

 */

class Pawn {

    /**

     * init

     */

    constructor(color) {

        this.symbol = "P";

        this.moved = 0;

        this.active = true;

        this.color = color;

        this.rows = [null, "A", "B", "C", "D", "E", "F", "G", "H"];

        this.img = this.color === "white" ? "w-pawn" : "b-pawn";

    }

    legalMove(x, y, nx, ny, take=false) {

        let direction = this.color === "black" ? "up" : "down";

        let xNum = this.rows.indexOf(x);

        let nxNum = this.rows.indexOf(nx);

        let xStep = xNum - nxNum;

        let yStep = Math.abs(y - ny);

        if (take === true) {

            if (direction === "up" && xStep === 1 && yStep === 1

                || direction === "down" && xStep === -1 && yStep === 1) {

                return true;

            }

        } else {

            if (this.moved === 0) {

                if (direction === "up" && xStep === 2 && yStep === 0

                    || direction === "down" && xStep === -2 && yStep === 0) {

                    return true;

                }

            }

            if (direction === "up" && xStep === 1 && yStep === 0

                || direction === "down" && xStep === -1 && yStep === 0) {

                return true;

            }

        }

        return false;

    }

}

module.exports = Pawn;