from sympy.core import Symbol, Function, Float, Rational, Integer, I, Mul, Pow, Eq
from sympy.functions import exp, factorial, sin
from sympy.logic import And
from sympy.series import Limit
from sympy.utilities.pytest import raises

from sympy.parsing.sympy_parser import (
    parse_expr, standard_transformations, rationalize, TokenError,
    split_symbols, implicit_multiplication, convert_equals_signs,
)


def test_sympy_parser():
    x = Symbol('x')
    inputs = {
        '2*x': 2 * x,
        '3.00': Float(3),
        '22/7': Rational(22, 7),
        '2+3j': 2 + 3*I,
        'exp(x)': exp(x),
        'x!': factorial(x),
        '3.[3]': Rational(10, 3),
        '10!': 3628800,
        '-(2)': -Integer(2),
        '[-1, -2, 3]': [Integer(-1), Integer(-2), Integer(3)],
        'Symbol("x").free_symbols': x.free_symbols,
        "S('S(3).n(n=3)')": 3.00,
        'factorint(12, visual=True)': Mul(
            Pow(2, 2, evaluate=False),
            Pow(3, 1, evaluate=False),
            evaluate=False),
        'Limit(sin(x), x, 0, dir="-")': Limit(sin(x), x, 0, dir='-'),

    }
    for text, result in inputs.items():
        assert parse_expr(text) == result


def test_rationalize():
    inputs = {
        '0.123': Rational(123, 1000)
    }
    transformations = standard_transformations + (rationalize,)
    for text, result in inputs.items():
        assert parse_expr(text, transformations=transformations) == result


def test_factorial_fail():
    inputs = ['x!!!', 'x!!!!', '(!)']

    for text in inputs:
        try:
            parse_expr(text)
            assert False
        except TokenError:
            assert True


def test_local_dict():
    local_dict = {
        'my_function': lambda x: x + 2
    }
    inputs = {
        'my_function(2)': Integer(4)
    }
    for text, result in inputs.items():
        assert parse_expr(text, local_dict=local_dict) == result


def test_global_dict():
    global_dict = {
        'Symbol': Symbol
    }
    inputs = {
        'Q & S': And(Symbol('Q'), Symbol('S'))
    }
    for text, result in inputs.items():
        assert parse_expr(text, global_dict=global_dict) == result


def test_issue_2515():
    raises(TokenError, lambda: parse_expr('(()'))
    raises(TokenError, lambda: parse_expr('"""'))


def test_issue_7663():
    x = Symbol('x')
    e = '2*(x+1)'
    assert parse_expr(e, evaluate=0) == parse_expr(e, evaluate=False)


def test_split_symbols():
    transformations = standard_transformations + \
                      (split_symbols, implicit_multiplication,)
    x = Symbol('x')
    y = Symbol('y')
    xy = Symbol('xy')

    assert parse_expr("xy") == xy
    assert parse_expr("xy", transformations=transformations) == x*y


def test_split_symbols_function():
    transformations = standard_transformations + \
                      (split_symbols, implicit_multiplication,)
    x = Symbol('x')
    y = Symbol('y')
    a = Symbol('a')
    f = Function('f')

    assert parse_expr("ay(x+1)", transformations=transformations) == a*y*(x+1)
    assert parse_expr("af(x+1)", transformations=transformations,
                      local_dict={'f':f}) == a*f(x+1)

def test_match_parentheses_implicit_multiplication():
    transformations = standard_transformations + \
                      (implicit_multiplication,)
    raises(TokenError, lambda: parse_expr('(1,2),(3,4]',transformations=transformations))

def test_convert_equals_signs():
    transformations = standard_transformations + \
                        (convert_equals_signs, )
    x = Symbol('x')
    y = Symbol('y')
    assert parse_expr("1*2=x", transformations=transformations) == Eq(2, x)
    assert parse_expr("y = x", transformations=transformations) == Eq(y, x)
    assert parse_expr("(2*y = x) = False",
        transformations=transformations) == Eq(Eq(2*y, x), False)
