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


from .operator import Operator
from ..generic import flatten_list


class Sub(Operator):

    """ The operator -

    >>> sub = Sub()
    >>> sub
    -
    >>> sub(1, 2)
    -1
    >>> sub.__tex__('1','2')
    '1 - 2'
    >>> sub.__tex__('1','-2')
    '1 - ( -2 )'
    >>> sub.__tex__('-1','2')
    '-1 - 2'
    >>> sub.__txt__('1','2')
    '1 - 2'
    >>> sub.__txt__('1','-2')
    '1 - ( -2 )'
    >>> sub.__txt__('-1','2')
    '-1 - 2'
    """
    _CARACT = {
        "operator": "-",
        "name": "sub",
        "priority": 2,
        "arity": 2,
        "actions": ("__sub__", "__rsub__"),
        "txt":  "{op1} - {op2}",
        "tex":  "{op1} - {op2}",
        }

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

    def l_parenthesis(self, op, str_join=False):
        return op

    def r_parenthesis(self, op, str_join=False):
        try:
            if op.mainOp.priority <= self.priority:
                op = flatten_list(["(", op, ")"])
            elif op[0] == '-':
                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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