import { Injectable } from '@angular/core';

@Injectable()
export class ColorService {

    /**
     * Creates a random color and return it as a hex string.
     */
    public getColor(): string {
        return this.getRandomColor();
    }

    /**
     * Converts a hex string and opacity in percent to RGBA color as string.
     */
    public convertHexToRGBA(hex: string, opacity: number): string {
        hex = hex.replace('#', '');
        const r = parseInt(hex.substring(0, 2), 16);
        const g = parseInt(hex.substring(2, 4), 16);
        const b = parseInt(hex.substring(4, 6), 16);
        return 'rgba(' + r + ',' + g + ',' + b + ',' + opacity / 100 + ')';
    }

    private getRandomColor(): string {
        const letters = '0123456789ABCDEF';
        let color = '#';
        for (let i = 0; i < 6; i++) {
            color += letters[Math.floor(Math.random() * 16)];
        }
        return color;
    }

}