###############################################################################
## Basics
###############################################################################

## TODO: write some tests here.

###############################################################################
## INHERITANCE
###############################################################################

class A
end

class B is A
end

a = A()
print(a)

b = B()
assert((b is B) and (b is A))

class Shape
  def display()
    return "${self.name} shape"
  end
end

class Circle is Shape
  def _init(r)
    self.r = r
    self.name = "circle"
  end
  def area()
    return 3.14 * self.r * self.r
  end
end

class Rectangle is Shape
  def _init(w, h)
    self.w = w; self.h = h
    self.name = "rectangle"
  end
  def area()
    return self.w * self.h
  end
end

class Square is Rectangle
  def _init(w)
    ## TODO: Currently there is no way of calling super(w, h)
    ## so we're setting our self here.
    self.w = w; self.h = w
    self.name = "square"
  end
end

c = Circle(1)
assert(c.display() == "circle shape")
assert(c is Circle)
assert(c is Shape)

r = Rectangle(2, 3)
assert(r is Shape)
assert(r.area() == 6)

s = Square(4)
assert(s is Square)
assert(s is Rectangle)
assert(s is Shape)
assert(s.area() == 16)

###############################################################################
## OPERATOR OVERLOADING
###############################################################################

class Vec2
  def _init(x, y)
    self.x = x; self.y = y
  end
  def _str
    return "<${self.x}, ${self.y}>"
  end
  def +(other)
    return Vec2(self.x + other.x,
                self.y + other.y)
  end
  def +=(other)
    self.x += other.x
    self.y += other.y
    return self
  end
  def ==(other)
    return self.x == other.x and self.y == other.y
  end
end

v1 = Vec2(1, 2); assert(v1.x == 1 and v1.y == 2)
print("v1 = $v1")

assert(str(v1) == "<1, 2>")

v2 = Vec2(3, 4); assert(v2.x == 3 and v2.y == 4)
print("v2 = $v2")

v3 = v1 + v2
print("v3 = $v3")

assert(v1 == Vec2(1, 2))

v1 += v2
assert(v1 == v3)

class Path
  def _init(path)
    self.path = path
  end
  def /(other)
    if other is String
      return Path(self.path + "/" + other)
    else if other is Path
      return Path(self.path + "/" + other.path)
    else
      assert(false, "Invalid type")
    end
  end
  def _str
    return self.path
  end
end

local = Path("/usr/local")
pocket = Path("bin/pocket")
print('local/pocket = "${local/pocket}"')
assert(str(local/pocket) == "/usr/local/bin/pocket")
assert(str(local/"lib") == "/usr/local/lib")

class N
  def _init(val)
    self.val = val
  end
  def _str()
    return "N(${self.val})"
  end
  def +(other)
    return N(self.val + other.val)
  end
  def +=(other)
    self.val += other.val
    return self
  end
  def %=(num)
    self.val %= num
    return self
  end
  def ==(other)
    return self.val == other.val
  end
  def <<(num)
    self.val *= 10
    self.val += num
    return self
  end
  def >>(other)
    other.val = self.val % 10
    self.val = (self.val - other.val) / 10
  end
  
  def !self()
    self.val -= 1
    return self.val + 1
  end
end

n1 = N(12)
n2 = N(23)
assert(n1 + n2 == N(n1.val + n2.val))
n1 %= 5
assert(n1.val == 2)

n3 = N(4) << 8 << 3 << 6
assert(n3 == N(4836))

n4 = N(0)
n3 >> n4; assert(n4.val == 6)
n3 >> n4; assert(n4.val == 3)
n3 >> n4; assert(n4.val == 8)
n3 >> n4; assert(n4.val == 4)

n5 = N(3)
assert(!n5 == 3)
assert(!n5 == 2)
assert(!n5 == 1)

print('ALL TESTS PASSED')