/**
 * Create an Animal Choir simulator
 *
 * The task constraints are:
 *
 * There must be 3 different choir member animals
 * (i.e. dogs, cats, mice)
 *
 * Every animal must have a sing method that returns a string representation of a voice
 * (i.e. 'bark', 'meow', 'squeak')
 *
 * Every animal must have a loudness property which can have 3 settings,
 * depending on which the sing method result will be rendered as
 * lowercase, first letter uppercase and uppercase.
 *
 * Singer groups are groups of animals with the same loudness property value.
 * Singer group song is represented with a CSV of the group singer sing result in random order.
 *
 * The choir simulator must have implement the following methods:
 *    crescendo - the choir start singing from the least loud singer group, and then are being joined
 *                by more and more loud singer groups until they are singing all together.
 *                The joining is represented with a new line.
 *                Example:
 *                  meow, squeak, bark
 *                  Meow, bark, squeak, Bark, meow
 *                  bark, Meow, MEOW, squeak, BARK, meow, Bark
 *
 *    arpeggio  - the choir singer groups of the same loudness start singing one by one from
 *                the least loud to the loudest
 *                Example:
 *                  meow, squeak, bark
 *                  Meow, Bark
 *                  MEOW, BARK
 *
 */

//TODO: Describe the class hierarchy


//Choir class
class Choir{

    public $line_ending = '';
    public $line_separator = '';
    public $voices = '';

    public function crescendo(){
        $crescendo_song = '';

        $animals = new Animal();
        //We define which animal voices will be included in song
        $animals->voices = $this->voices;

        //First we start with the silent
        $animals->loudness = 'silent';
        //Call the function
        $silent = $animals->sing();
        //echo the result
        $crescendo_song .= $this->stringForm($silent);

        //Then we continue with the normal, but also merge with silent
        $animals->loudness = 'normal';
        $normal = array_merge($animals->sing(),$silent);
        $crescendo_song .= $this->stringForm($normal);

        //And in the end we merge loud with silent and normal
        $animals->loudness = 'loud';
        $loud = array_merge($animals->sing(),$silent,$normal);
        $crescendo_song .= $this->stringForm($loud);

        return $crescendo_song;
    }


    public function arpeggio(){
        $arpeggio_song = '';

        $animals = new Animal();
        //We define which animal voices will be included in song
        $animals->voices = $this->voices;

        //First we start with the silent
        $animals->loudness = 'silent';
        $arpeggio_song .= $this->stringForm($animals->sing());

        //Then normal
        $animals->loudness = 'normal';
        $arpeggio_song .= $this->stringForm($animals->sing());

        //And then the loud
        $animals->loudness = 'loud';
        $arpeggio_song .= $this->stringForm($animals->sing());

        return $arpeggio_song;

    }


    private function stringForm($array){
        //Randomize the array
        shuffle($array);
        //Predefine a song and a separator
        $song = '';
        $comma = '';
        //Form song string
        foreach ($array as $slog) {
            $song .= $comma.$slog;
            $comma = $this->line_separator.' ';
        };
        return $song.$this->line_ending;
    }


}

//Animal class
class Animal{
    public $loudness = '';

    public function sing(){
        $song = array();
        foreach ($this->voices as $voices) {
            switch ($this->loudness) {
                case 'silent':
                    array_push($song,strtolower($voices));
                break;
                case 'normal':
                    array_push($song,ucfirst($voices));
                break;
                case 'loud':
                    array_push($song,strtoupper($voices));
                break;
                default:
                    array_push($song,$voices);
                break;
            }
        }
        return $song;
    }

}


$choir = new Choir();
$choir->line_ending = PHP_EOL;
//$choir->line_ending = '<br>'; //For cleared viewing in browser use <br> tag
//Define the line separator for CSV
$choir->line_separator = ',';
//Define the voices of animals
$choir->voices = array('bark','meow','squeak');
//Call and echo the functions
echo $choir->crescendo();
echo $choir->arpeggio();