"""Tests for the Compass helper functions.

Not all of Compass is implemented, and the arrangement of Compass functions
doesn't exactly match the arrangement in the original documentation.
Regardless, this is a good starting place:

http://compass-style.org/reference/compass/helpers/

Some functions appear to be undocumented, but nonetheless are part of Compass's
Ruby code.
"""

from scss.expression import Calculator
from scss.functions.compass.helpers import COMPASS_HELPERS_LIBRARY
from scss.rule import Namespace
from scss.types import ColorValue, NumberValue

import pytest
xfail = pytest.mark.xfail

# TODO many of these tests could also stand to test for failure cases

@pytest.fixture
def calc():
    ns = Namespace(functions=COMPASS_HELPERS_LIBRARY)
    return Calculator(ns).evaluate_expression

# ------------------------------------------------------------------------------
# Listish functions
# See: http://ruby-doc.org/gems/docs/c/compass-0.12.2/Compass/SassExtensions/Functions/Lists.html

def test_blank(calc):
    assert calc('blank(false)')
    assert calc('blank("")')
    assert calc('blank(" ")')
    # TODO this is a syntax error; see #166
    #assert calc('blank(())')

    assert not calc('blank(null)')  # yes, really
    assert not calc('blank(1)')
    assert not calc('blank((1, 2))')
    assert not calc('blank(0)')

def test_compact(calc):
    assert calc('compact(1 2 3 false 4 5 null 6 7)') == calc('1 2 3 4 5 6 7')

def test_reject(calc):
    assert calc('reject(a b c d, a, c)') == calc('b d')
    assert calc('reject(a b c d, e)') == calc('a b c d')

def test_first_value_of(calc):
    assert calc('first-value-of(a b c d)') == calc('a')
    assert calc('first-value-of("a b c d")') == calc('"a"')

# -compass-list

# -compass-space-list

# -compass-slice


## Property prefixing

# prefixed

# prefix

# -moz...


## Selector generation

# append-selector

# elements-of-type

def test_enumerate(calc):
    assert calc('enumerate(foo, 4, 7)') == calc('foo-4, foo-5, foo-6, foo-7')
    assert calc('enumerate("bar", 8, 10)') == calc('bar-8, bar-9, bar-10')

def test_headings(calc):
    assert calc('headings()') == calc('h1, h2, h3, h4, h5, h6')
    assert calc('headings(all)') == calc('h1, h2, h3, h4, h5, h6')
    assert calc('headings(2)') == calc('h1, h2')
    assert calc('headings(2, 5)') == calc('h2, h3, h4, h5')


# nest

# range


## Working with CSS constants

# position

def test_opposite_position(calc):
    assert calc('opposite-position(left)') == calc('right')
    assert calc('opposite-position(top)') == calc('bottom')
    assert calc('opposite-position(center)') == calc('center')
    assert calc('opposite-position(top left)') == calc('bottom right')
    assert calc('opposite-position(center right)') == calc('center left')


## Math

# pi

# sin

# cos

# tan


## Fonts

# font-url

# font-files

# inline-font-files


## External stylesheets

# stylesheet-url