import BaseModel from './base.model';

const SubtractionModel = Object.create(BaseModel);

SubtractionModel.generate = function(n, level) {
    const equals = [];
    const notequals = [];
    const target = level + 2;
    const upperLimit = target * 10;

    let g1, g2, b1, b2, b3;

    for (let i = target + 1; i < upperLimit; i++) {
        g1 = i;
        g2 = i - target;

        b1 = i + Math.ceil(Math.random() * 3);
        b2 = Math.max(1, i - Math.ceil(Math.random() * 3));
        b3 = i - target;

        // console.log(`(${i}) ${g1} - ${g2} = ${g1 - g2}`);
        // console.error(`(${i}) ${b1} - ${b3} = ${b1 - b3}`);
        // console.error(`(${i}) ${b2} - ${b3} = ${b2 - b3}`);

        equals.push(`${g1}-${g2}`);
        notequals.push(`${b1}-${b3}`);
        notequals.push(`${b2}-${b3}`);
    }

    return this.buildResults(equals, notequals, n);
};

SubtractionModel.getTitle = (level) => {
    return `Equals ${level + 2}`;
};

SubtractionModel.getError = (value, level) => {
    return `Oops! ${value} does not equal ${level + 2}.`;
};

export default SubtractionModel;