from __future__ import division

from sympy import Symbol, pi, sqrt, Rational
from sympy.geometry import Circle, Ellipse, Line, Point, Polygon, Ray, RegularPolygon, Segment, Triangle, Parabola
from sympy.geometry.entity import scale
from sympy.utilities.pytest import raises

from random import random


def test_subs():
    x = Symbol('x', real=True)
    y = Symbol('y', real=True)
    p = Point(x, 2)
    q = Point(1, 1)
    r = Point(3, 4)
    for o in [p,
              Segment(p, q),
              Ray(p, q),
              Line(p, q),
              Triangle(p, q, r),
              RegularPolygon(p, 3, 6),
              Polygon(p, q, r, Point(5, 4)),
              Circle(p, 3),
              Ellipse(p, 3, 4)]:
        assert 'y' in str(o.subs(x, y))
    assert p.subs({x: 1}) == Point(1, 2)
    assert Point(1, 2).subs(Point(1, 2), Point(3, 4)) == Point(3, 4)
    assert Point(1, 2).subs((1, 2), Point(3, 4)) == Point(3, 4)
    assert Point(1, 2).subs(Point(1, 2), Point(3, 4)) == Point(3, 4)
    assert Point(1, 2).subs({(1, 2)}) == Point(2, 2)
    raises(ValueError, lambda: Point(1, 2).subs(1))
    raises(ValueError, lambda: Point(1, 1).subs((Point(1, 1), Point(1,
           2)), 1, 2))


def test_transform():
    assert scale(1, 2, (3, 4)).tolist() == \
        [[1, 0, 0], [0, 2, 0], [0, -4, 1]]


def test_reflect_entity_overrides():
    x = Symbol('x', real=True)
    y = Symbol('y', real=True)
    b = Symbol('b')
    m = Symbol('m')
    l = Line((0, b), slope=m)
    p = Point(x, y)
    r = p.reflect(l)
    c = Circle((x, y), 3)
    cr = c.reflect(l)
    assert cr == Circle(r, -3)
    assert c.area == -cr.area

    pent = RegularPolygon((1, 2), 1, 5)
    l = Line(pent.vertices[1],
        slope=Rational(random() - .5, random() - .5))
    rpent = pent.reflect(l)
    assert rpent.center == pent.center.reflect(l)
    rvert = [i.reflect(l) for i in pent.vertices]
    for v in rpent.vertices:
        for i in range(len(rvert)):
            ri = rvert[i]
            if ri.equals(v):
                rvert.remove(ri)
                break
    assert not rvert
    assert pent.area.equals(-rpent.area)