# encoding: utf-8
#
#
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this file,
# You can obtain one at http:# mozilla.org/MPL/2.0/.
#
# Contact: Kyle Lahnakoski (kyle@lahnakoski.com)
#

from __future__ import absolute_import, division, unicode_literals

from jx_base.expressions.expression import Expression
from jx_base.expressions.false_op import FALSE
from jx_base.expressions.integer_op import ToIntegerOp
from jx_base.expressions.literal import ZERO
from jx_base.expressions.max_op import MaxOp
from jx_base.expressions.to_text_op import ToTextOp
from jx_base.language import is_op
from mo_json import T_INTEGER


class BasicIndexOfOp(Expression):
    """
    PLACEHOLDER FOR BASIC value.indexOf(find, start) (CAN NOT DEAL WITH NULLS)
    """

    _data_type = T_INTEGER

    def __init__(self, value, find, start):
        Expression.__init__(self, value, find, start)
        self.value = value
        self.find = find
        self.start = start

    def __data__(self):
        return {"basic.indexOf": [
            self.value.__data__(),
            self.find.__data__(),
            self.start.__data__(),
        ]}

    def vars(self):
        return self.value.vars() | self.find.vars() | self.start.vars()

    def missing(self, lang):
        return FALSE

    def invert(self, lang):
        return FALSE

    def partial_eval(self, lang):
        start = ToIntegerOp(MaxOp(ZERO, self.start)).partial_eval(lang)
        return self.lang.BasicIndexOfOp(
            ToTextOp(self.value).partial_eval(lang),
            ToTextOp(self.find).partial_eval(lang),
            start
        )

    def __eq__(self, other):
        if not is_op(other, BasicIndexOfOp):
            return False
        return (
            self.value == self.value
            and self.find == other.find
            and self.start == other.start
        )
