#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2017 lafrite <lafrite@Poivre>
#
# Distributed under terms of the MIT license.

from mapytex.calculus.core.tree import Tree
from .mo import MO, MOnumber, MOstr
from .exceptions import MOError
from ..renders import tree2txt, tree2tex

__all__ = ["MOMonomial"]

class MOMonomial(MO):

    """ Monomial math object"""

    def __init__(self, coefficient, variable, power = 1):
        """ Initiate the MOMonomial

        :param coefficient: coefficient of the monomial (a non zero constant)
        :param variable: varaible of the monomial (a MOstr or later a MOSqrt)
        :param power: non negative interger (MOnumber type)

        >>> MOMonomial(4, "x", 2)
        <MOMonomial 4x^2>
        >>> MOMonomial(4, "x", 1)
        <MOMonomial 4x>
        >>> MOMonomial(1, "x", 2)
        <MOMonomial x^2>
        >>> MOMonomial(1, "x", 1)
        <MOMonomial x>
        >>> MOMonomial(4, 3, 1)
        Traceback (most recent call last):
            ...
        mapytex.calculus.core.MO.exceptions.MOError: The variable of a monomial should be convertible into MOstr
        >>> MOMonomial(4, "x", 0)
        Traceback (most recent call last):
            ...
        mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be greater than 0
        >>> MOMonomial(4, "x", -2)
        Traceback (most recent call last):
            ...
        mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be greater than 0
        >>> MOMonomial(4, "x", 2.4)
        Traceback (most recent call last):
            ...
        mapytex.calculus.core.MO.exceptions.MOError: The power of a monomial should be a integer
        >>> MOMonomial(0, "x", 1)
        Traceback (most recent call last):
            ...
        mapytex.calculus.core.MO.exceptions.MOError: The coefficient of a monomial should not be 0
        """
        _coefficient = MO.factory(coefficient)
        if coefficient == 0:
            raise MOError("The coefficient of a monomial should not be 0")
        self._coefficient = _coefficient

        _variable = MO.factory(variable)
        if not isinstance(_variable, MOstr):
            raise MOError("The variable of a monomial should be convertible into MOstr")
        self._variable = _variable

        _power = MO.factory(power)
        if power <= 0:
            raise MOError("The power of a monomial should be greater than 0")
        elif not isinstance(_power.value, int):
            raise MOError("The power of a monomial should be a integer")
        self._power = _power

        if self._power > 1:
            self.value = Tree("*",
                    self._coefficient,
                    Tree("^",
                        self._variable,
                        self._power
                        )
                    )
        else:
            self.value = Tree("*",
                    self._coefficient,
                    self._variable,
                    )

    @property
    def __txt__(self):
        try:
            if self._coefficient == 1:
                try:
                    return tree2txt(self.value.right_value)
                except AttributeError:
                    return str(self.value.right_value)
        except TypeError:
            pass

        try:
            return tree2txt(self.value)
        except AttributeError:
            return str(self.value)

    @property
    def __tex__(self):
        try:
            if self._coefficient == 1:
                try:
                    return tree2tex(self.value.right_value)
                except AttributeError:
                    return str(self.value.right_value)
        except TypeError:
            pass

        try:
            return tree2tex(self.value)
        except AttributeError:
            return str(self.value)


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