import numpy as np

from checkfield import checkfield
from fielddisplay import fielddisplay
from WriteData import WriteData


class rotational(object):
    '''
    ROTATIONAL class definition

        Usage:
            rotational = rotational()
    '''

    def __init__(self, *args): #{{{
        self.equatorialmoi      = 0
        self.polarmoi           = 0
        self.langularvelocity   = 0

        nargin = len(args)

        if nargin == 0:
            self.setdefaultparameters()
        else:
            raise Exception('constructor not supported')
    #}}}

    def __repr__(self): # {{{
        s = '   rotational parameters:\n'
        s += '{}\n'.format(fielddisplay(self, 'equatorialmoi', 'mean equatorial moment of inertia [kg m^2]'))
        s += '{}\n'.format(fielddisplay(self, 'polarmoi', 'polar moment of inertia [kg m^2]'))
        s += '{}\n'.format(fielddisplay(self, 'angularvelocity', 'mean rotational velocity of earth [per second]'))

        return s
    #}}}

    def setdefaultparameters(self): # {{{
        #moment of inertia
        self.equatorialmoi  = 8.0077e37 # [kg m^2]
        self.polarmoi       = 8.0345e37 # [kg m^2]

        #mean rotational velocity of earth
        self.angularvelocity = 7.2921e-5 # [s^-1]

        return self
    #}}}

    def checkconsistency(self, md, solution, analyses): # {{{
        if not 'SealevelriseAnalysis' in analyses or solution == 'TransientSolution' and md.transient.isrotational == 0:
            return md

        md = checkfield(md, 'fieldname', 'solidearth.rotational.equatorialmoi', 'NaN', 1, 'Inf', 1)
        md = checkfield(md, 'fieldname', 'solidearth.rotational.polarmoi', 'NaN', 1, 'Inf', 1)
        md = checkfield(md, 'fieldname', 'solidearth.rotational.angularvelocity', 'NaN', 1, 'Inf', 1)

        return md
    #}}}

    def defaultoutputs(self, md): #{{{
        return []
    #}}}

    def marshall(self, prefix, md, fid): #{{{
        WriteData(fid, prefix, 'object', self, 'fieldname', 'equatorialmoi', 'name', 'md.solidearth.rotational.equatorialmoi', 'format', 'Double')
        WriteData(fid, prefix, 'object', self, 'fieldname', 'polarmoi', 'name', 'md.solidearth.rotational.polarmoi', 'format', 'Double')
        WriteData(fid, prefix, 'object', self, 'fieldname', 'angularvelocity', 'name', 'md.solidearth.rotational.angularvelocity', 'format', 'Double')
    #}}}

    def extrude(self, md): #{{{
        return self
    #}}}