from sympy.utilities.pytest import raises
from sympy import (symbols, Function, Integer, Matrix, Abs,
    Rational, Float, S, WildFunction, ImmutableMatrix, sin, true, false, ones,
    sqrt, root, AlgebraicNumber, Symbol, Dummy, Wild)
from sympy.core.compatibility import exec_
from sympy.geometry import Point, Ellipse
from sympy.printing import srepr
from sympy.polys import ring, field, ZZ, QQ, lex, grlex

x, y = symbols('x,y')

# eval(srepr(expr)) == expr has to succeed in the right environment. The right
# environment is the scope of "from sympy import *" for most cases.
ENV = {}
exec_("from sympy import *", ENV)


def sT(expr, string):
    """
    sT := sreprTest

    Tests that srepr delivers the expected string and that
    the condition eval(srepr(expr))==expr holds.
    """
    assert srepr(expr) == string
    assert eval(string, ENV) == expr


def test_printmethod():
    class R(Abs):
        def _sympyrepr(self, printer):
            return "foo(%s)" % printer._print(self.args[0])
    assert srepr(R(x)) == "foo(Symbol('x'))"


def test_Add():
    sT(x + y, "Add(Symbol('x'), Symbol('y'))")
    assert srepr(x**2 + 1, order='lex') == "Add(Pow(Symbol('x'), Integer(2)), Integer(1))"
    assert srepr(x**2 + 1, order='old') == "Add(Integer(1), Pow(Symbol('x'), Integer(2)))"


def test_Function():
    sT(Function("f")(x), "Function('f')(Symbol('x'))")
    # test unapplied Function
    sT(Function('f'), "Function('f')")

    sT(sin(x), "sin(Symbol('x'))")
    sT(sin, "sin")

def test_Geometry():
    sT(Point(0, 0), "Point2D(Integer(0), Integer(0))")
    sT(Ellipse(Point(0, 0), 5, 1),
       "Ellipse(Point2D(Integer(0), Integer(0)), Integer(5), Integer(1))")
    # TODO more tests


def test_Singletons():
    sT(S.Catalan, 'Catalan')
    sT(S.ComplexInfinity, 'zoo')
    sT(S.EulerGamma, 'EulerGamma')
    sT(S.Exp1, 'E')
    sT(S.GoldenRatio, 'GoldenRatio')
    sT(S.Half, 'Rational(1, 2)')
    sT(S.ImaginaryUnit, 'I')
    sT(S.Infinity, 'oo')
    sT(S.NaN, 'nan')
    sT(S.NegativeInfinity, '-oo')
    sT(S.NegativeOne, 'Integer(-1)')
    sT(S.One, 'Integer(1)')
    sT(S.Pi, 'pi')
    sT(S.Zero, 'Integer(0)')


def test_Integer():
    sT(Integer(4), "Integer(4)")


def test_list():
    sT([x, Integer(4)], "[Symbol('x'), Integer(4)]")


def test_Matrix():
    for cls, name in [(Matrix, "MutableDenseMatrix"), (ImmutableMatrix, "ImmutableMatrix")]:
        sT(cls([[x**+1, 1], [y, x + y]]),
           "%s([[Symbol('x'), Integer(1)], [Symbol('y'), Add(Symbol('x'), Symbol('y'))]])" % name)

        sT(cls(), "%s([])" % name)

        sT(cls([[x**+1, 1], [y, x + y]]), "%s([[Symbol('x'), Integer(1)], [Symbol('y'), Add(Symbol('x'), Symbol('y'))]])" % name)


def test_empty_Matrix():
    sT(ones(0, 3), "MutableDenseMatrix(0, 3, [])")
    sT(ones(4, 0), "MutableDenseMatrix(4, 0, [])")
    sT(ones(0, 0), "MutableDenseMatrix([])")


def test_Rational():
    sT(Rational(1, 3), "Rational(1, 3)")
    sT(Rational(-1, 3), "Rational(-1, 3)")


def test_Float():
    sT(Float('1.23', prec=3), "Float('1.22998', prec=3)")
    sT(Float('1.23456789', prec=9), "Float('1.23456788994', prec=9)")
    sT(Float('1.234567890123456789', prec=19),
       "Float('1.234567890123456789013', prec=19)")
    sT(Float(
        '0.60038617995049726', 15), "Float('0.60038617995049726', prec=15)")


def test_Symbol():
    sT(x, "Symbol('x')")
    sT(y, "Symbol('y')")
    sT(Symbol('x', negative=True), "Symbol('x', negative=True)")


def test_Symbol_two_assumptions():
    x = Symbol('x', negative=0, integer=1)
    # order could vary
    s1 = "Symbol('x', integer=True, negative=False)"
    s2 = "Symbol('x', negative=False, integer=True)"
    assert srepr(x) in (s1, s2)
    assert eval(srepr(x), ENV) == x


def test_Symbol_no_special_commutative_treatment():
    sT(Symbol('x'), "Symbol('x')")
    sT(Symbol('x', commutative=False), "Symbol('x', commutative=False)")
    sT(Symbol('x', commutative=0), "Symbol('x', commutative=False)")
    sT(Symbol('x', commutative=True), "Symbol('x', commutative=True)")
    sT(Symbol('x', commutative=1), "Symbol('x', commutative=True)")


def test_Wild():
    sT(Wild('x', even=True), "Wild('x', even=True)")


def test_Dummy():
    # cannot use sT here
    d = Dummy('d', nonzero=True)
    assert srepr(d) == "Dummy('d', nonzero=True)"


def test_Dummy_from_Symbol():
    # should not get the full dictionary of assumptions
    n = Symbol('n', integer=True)
    d = n.as_dummy()
    assert srepr(d) == "Dummy('n', integer=True)"


def test_tuple():
    sT((x,), "(Symbol('x'),)")
    sT((x, y), "(Symbol('x'), Symbol('y'))")


def test_WildFunction():
    sT(WildFunction('w'), "WildFunction('w')")


def test_settins():
    raises(TypeError, lambda: srepr(x, method="garbage"))


def test_Mul():
    sT(3*x**3*y, "Mul(Integer(3), Pow(Symbol('x'), Integer(3)), Symbol('y'))")
    assert srepr(3*x**3*y, order='old') == "Mul(Integer(3), Symbol('y'), Pow(Symbol('x'), Integer(3)))"

def test_AlgebraicNumber():
    a = AlgebraicNumber(sqrt(2))
    sT(a, "AlgebraicNumber(Pow(Integer(2), Rational(1, 2)), [Integer(1), Integer(0)])")
    a = AlgebraicNumber(root(-2, 3))
    sT(a, "AlgebraicNumber(Pow(Integer(-2), Rational(1, 3)), [Integer(1), Integer(0)])")

def test_PolyRing():
    assert srepr(ring("x", ZZ, lex)[0]) == "PolyRing((Symbol('x'),), ZZ, lex)"
    assert srepr(ring("x,y", QQ, grlex)[0]) == "PolyRing((Symbol('x'), Symbol('y')), QQ, grlex)"
    assert srepr(ring("x,y,z", ZZ["t"], lex)[0]) == "PolyRing((Symbol('x'), Symbol('y'), Symbol('z')), ZZ[t], lex)"


def test_FracField():
    assert srepr(field("x", ZZ, lex)[0]) == "FracField((Symbol('x'),), ZZ, lex)"
    assert srepr(field("x,y", QQ, grlex)[0]) == "FracField((Symbol('x'), Symbol('y')), QQ, grlex)"
    assert srepr(field("x,y,z", ZZ["t"], lex)[0]) == "FracField((Symbol('x'), Symbol('y'), Symbol('z')), ZZ[t], lex)"


def test_PolyElement():
    R, x, y = ring("x,y", ZZ)
    assert srepr(3*x**2*y + 1) == "PolyElement(PolyRing((Symbol('x'), Symbol('y')), ZZ, lex), [((2, 1), 3), ((0, 0), 1)])"


def test_FracElement():
    F, x, y = field("x,y", ZZ)
    assert srepr((3*x**2*y + 1)/(x - y**2)) == "FracElement(FracField((Symbol('x'), Symbol('y')), ZZ, lex), [((2, 1), 3), ((0, 0), 1)], [((1, 0), 1), ((0, 2), -1)])"

def test_BooleanAtom():
    assert srepr(true) == "S.true"
    assert srepr(false) == "S.false"
