let builder = {
    // Main method for initializing logo rows
    buildLogo: function (number) {
        if (builder.validateNumber(number) === true) {
            let symbols = builder.getSymbols();

            builder.generateTopPart(number, symbols);
            builder.generateBottomPart(number, symbols);
        } else {
            //Throw error message
            console.log('Oops, wrong number value');
        }
    },
    generateTopPart: function (number, symbols) {
        let rowLength = (number + 1) / 2;
        let outerBackground = number;
        let innerForeground = number;
        let middleBackground = number;

        for (let row = rowLength; row > 0; row--) {
            let halfTopPartLogo =
                symbols.background.repeat(outerBackground) + symbols.foreground.repeat(innerForeground) +
                symbols.background.repeat(middleBackground) + symbols.foreground.repeat(innerForeground) +
                symbols.background.repeat(outerBackground);

            console.log(halfTopPartLogo.repeat(2));

            outerBackground--;
            innerForeground += 2;
            middleBackground -= 2;
        }
    },
    generateBottomPart: function (number, symbols) {
        let rowLength = Math.floor((number + 1) / 2);
        let middleBackground = 1;
        let middleForeground = (number * 2) - 1;
        for (let row = rowLength; row > 0; row--) {
            let halfBottomPart =
                symbols.background.repeat(row - 1) + symbols.foreground.repeat(number) +
                symbols.background.repeat(middleBackground) + symbols.foreground.repeat(middleForeground) +
                symbols.background.repeat(middleBackground) + symbols.foreground.repeat(number) + symbols.background.repeat(row - 1);

            console.log(halfBottomPart.repeat(2));

            middleBackground += 2;
            middleForeground -= 2;
        }
    },
    validateNumber: function(number) {
        if (number % 2 !== 0 && number > 2 && number < 10000) {
            return true;
        }
        return false;
    },
    getSymbols: function () {
        return {
            background: '-',
            foreground: '*'
        };
    }
};

builder.buildLogo(7);