#!/usr/bin/env python
# encoding: utf-8


from .operator import Operator
from ..generic import flatten_list

class Sub1(Operator):

    """ The operator -

    >>> sub1 = Sub1()
    >>> sub1
    -
    >>> sub1(1)
    -1
    >>> sub1.__tex__('1')
    '- 1'
    >>> sub1.__tex__('-1')
    '- ( -1 )'
    >>> sub1.__txt__('1')
    '- 1'
    >>> sub1.__txt__('-1')
    '- ( -1 )'
    """

    _CARACT = {
        "operator" : "-", \
        "name" : "sub1",\
        "priority" : 3, \
        "arity" : 1, \
        "actions" : "__neg__",\
        "txt" :  "- {op1}",\
        "tex" :  "- {op1}",\
        }

    def __init__(self):
        """ Initiate Sub1 Operator """
        super(Sub1, self).__init__(**self._CARACT)

    def l_parenthesis(self, op, str_join=False):
        """ Add parenthesis if necessary """
        try:
            if op.mainOp.priority <= self.priority:
                op = flatten_list(["("] + [op] + [")"])
        except AttributeError:
            # op has not the attribute priority
            try:
                if int(op) < 0:
                    op = ['(', op, ')']
            except ValueError:
                pass

        ans = flatten_list([op])
        if str_join:
            ans = ' '.join([str(i) for i in ans])
        return ans


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