"""
Provide a unified interface to a set of interfaces in a subsystem.
Facade defines a higher-level interface that makes the subsystem easier
to use.
"""


class Facade:
    """
    Know which subsystem classes are responsible for a request.
    Delegate client requests to appropriate subsystem objects.
    """

    def __init__(self):
        self._subsystem_1 = Subsystem1()
        self._subsystem_2 = Subsystem2()

    def operation(self):
        self._subsystem_1.operation1()
        self._subsystem_1.operation2()
        self._subsystem_2.operation1()
        self._subsystem_2.operation2()


class Subsystem1:
    """
    Implement subsystem functionality.
    Handle work assigned by the Facade object.
    Have no knowledge of the facade; that is, they keep no references to
    it.
    """

    def operation1(self):
        pass

    def operation2(self):
        pass


class Subsystem2:
    """
    Implement subsystem functionality.
    Handle work assigned by the Facade object.
    Have no knowledge of the facade; that is, they keep no references to
    it.
    """

    def operation1(self):
        pass

    def operation2(self):
        pass


def main():
    facade = Facade()
    facade.operation()


if __name__ == "__main__":
    main()    	
    	

    	
    		
class Book {
    private $author;
    private $title;
    function __construct($title_in, $author_in) {
        $this->author = $author_in;
        $this->title  = $title_in;
    }
    function getAuthor() {
        return $this->author;
    }
    function getTitle() {
        return $this->title;
    }
    function getAuthorAndTitle() {
        return $this->getTitle().' by '.$this->getAuthor();
    }
}

class CaseReverseFacade {
    public static function reverseStringCase($stringIn) {
        $arrayFromString = ArrayStringFunctions::stringToArray($stringIn);
        $reversedCaseArray = ArrayCaseReverse::reverseCase($arrayFromString);
        $reversedCaseString = ArrayStringFunctions::arrayToString($reversedCaseArray);
        return $reversedCaseString;
    }
}

class ArrayCaseReverse {
    private static $uppercase_array = 
        array('A', 'B', 'C', 'D', 'E', 'F',
              'G', 'H', 'I', 'J', 'K', 'L',
              'M', 'N', 'O', 'P', 'Q', 'R',
              'S', 'T', 'U', 'V', 'W', 'X',
              'Y', 'Z');
    private static $lowercase_array = 
        array('a', 'b', 'c', 'd', 'e', 'f',
              'g', 'h', 'i', 'j', 'k', 'l',
              'm', 'n', 'o', 'p', 'q', 'r',
              's', 't', 'u', 'v', 'w', 'x',
              'y', 'z');
    public static function reverseCase($arrayIn) {
        $array_out = array();
        for ($x = 0; $x < count($arrayIn); $x++) {
         if (in_array($arrayIn[$x], self::$uppercase_array)) {
                 $key = array_search($arrayIn[$x], self::$uppercase_array);
         $array_out[$x] = self::$lowercase_array[$key];
         } elseif (in_array($arrayIn[$x], self::$lowercase_array)) {
                 $key = array_search($arrayIn[$x], self::$lowercase_array);
         $array_out[$x] = self::$uppercase_array[$key];
             } else {
         $array_out[$x] = $arrayIn[$x];
             }
        }
    return $array_out;
    }
}

class ArrayStringFunctions {
    public static function arrayToString($arrayIn) {
      $string_out = NULL;
      foreach ($arrayIn as $oneChar) {
        $string_out .= $oneChar;
      }
      return $string_out;
    }
    public static function stringToArray($stringIn) {
      return str_split($stringIn);
    }
}


  witeln('BEGIN TESTING FACADE PATTERN');
  witeln('');
 
  $book = new Book('Design Patterns', 'Gamma, Helm, Johnson, and Vlissides');

  witeln('Original book title: '.$book->getTitle());
  witeln('');

  $bookTitleReversed = CaseReverseFacade::reverseStringCase($book->getTitle());  
 
  writeln('Reversed book title: '.$bookTitleReversed);
  witeln('');

  writeln('END TESTING FACADE PATTERN');
 
  function writeln($line_in) {
    echo $line_in."<br/>";
  }    	
    	

    	
    		
// 1. Subsystem
class PointCartesian {
    private double x, y;
    public PointCartesian(double x, double y ) {
        this.x = x;
        this.y = y;
    }

    public void  move( int x, int y ) {
        this.x += x;
        this.y += y;
    }

    public String toString() {
        return "(" + x + "," + y + ")";
    }

    public double getX() {
        return x;
    }

    public double getY() {
        return y;
    }
}

// 1. Subsystem
class PointPolar {
    private double radius, angle;

    public PointPolar(double radius, double angle) {
        this.radius = radius;
        this.angle = angle;
    }

    public void  rotate(int angle) {
        this.angle += angle % 360;
    }

    public String toString() {
        return "[" + radius + "@" + angle + "]";
    }
}

// 1. Desired interface: move(), rotate()
class Point {
    // 2. Design a "wrapper" class
    private PointCartesian pointCartesian;

    public Point(double x, double y) {
        pointCartesian = new PointCartesian(x, y);
    }

    public String toString() {
        return pointCartesian.toString();
    }

    // 4. Wrapper maps
    public void move(int x, int y) {
        pointCartesian.move(x, y);
    }

    public void rotate(int angle, Point o) {
        double x = pointCartesian.getX() - o.pointCartesian.getX();
        double y = pointCartesian.getY() - o.pointCartesian.getY();
        PointPolar pointPolar = new PointPolar(Math.sqrt(x * x + y * y),Math.atan2(y, x) * 180 / Math.PI);
        // 4. Wrapper maps
        pointPolar.rotate(angle);
        System.out.println("  PointPolar is " + pointPolar);
        String str = pointPolar.toString();
        int i = str.indexOf('@');
        double r = Double.parseDouble(str.substring(1, i));
        double a = Double.parseDouble(str.substring(i + 1, str.length() - 1));
        pointCartesian = new PointCartesian(r*Math.cos(a*Math.PI/180) + o.pointCartesian.getX(),
                r*Math.sin(a * Math.PI / 180) + o.pointCartesian.getY());
    }
}

class Line {
    private Point o, e;
    public Line(Point ori, Point end) {
        o = ori;
        e = end;
    }

    public void  move(int x, int y) {
        o.move(x, y);
        e.move(x, y);
    }

    public void  rotate(int angle) {
        e.rotate(angle, o);
    }

    public String toString() {
        return "origin is " + o + ", end is " + e;
    }
}

public class FacadeDemo {
    public static void main(String[] args) {
        // 3. Client uses the Facade
        Line lineA = new Line(new Point(2, 4), new Point(5, 7));
        lineA.move(-2, -4);
        System.out.println( "after move:  " + lineA );
        lineA.rotate(45);
        System.out.println( "after rotate: " + lineA );
        Line lineB = new Line( new Point(2, 1), new Point(2.866, 1.5));
        lineB.rotate(30);
        System.out.println("30 degrees to 60 degrees: " + lineB);
    }
}