from flask_wtf import Form
from wtforms import DateField, IntegerField, DecimalField, StringField, SelectField, SubmitField
from wtforms.validators import ValidationError, Length
from datetime import date


def date_check(form, field):
    if field.data < form.last_pitstop.date:
        raise ValidationError('The new date must not be before %s' % form.last_pitstop.date)
    if field.data > date.today():
        raise ValidationError('The new date must not be after %s' % date.today())


def odometer_check(form, field):
    if field.data <= form.last_pitstop.odometer:
        raise ValidationError('The new odometer value must be higher than %i km' % form.last_pitstop.odometer)


def litres_check(form, field):
    if field.data is not None and field.data <= 0:
        raise ValidationError('You must fuel at least 0.1 l')


def costs_check(form, field):
    if field.data is not None and field.data <= 0:
        raise ValidationError('Costs must be above 0.01 €.')


def edit_costs_check(form, field):
    costs_check_required = (form.costs.default  is not None and form.costs.default > 0)
    if costs_check_required and field.data is not None and field.data <= 0:
        raise ValidationError('Costs must be above 0.01 €.')


class SelectVehicleForm(Form):
    vehicle = SelectField('Vehicle', coerce=int)
    submit = SubmitField(label='Do it!')


class CreatePitstopForm(Form):
    date = DateField('Date of Pitstop', validators=[date_check])
    odometer = IntegerField('Odometer (km)', validators=[odometer_check])
    litres = DecimalField('Litres (l)', places=2, validators=[litres_check])
    costs = DecimalField('Costs (€, overall)', places=2, validators=[costs_check])
    submit = SubmitField(label='Do it!')
    last_pitstop = None

    def set_pitstop(self, last_pitstop):
        self.last_pitstop = last_pitstop


class EditVehicleForm(Form):
    name = StringField('Name', validators=[Length(1, 255)])
    submit = SubmitField(label='Do it!')


class DeleteVehicleForm(Form):
    submit = SubmitField(label='Do it!')


class DeleteAccountForm(Form):
    submit = SubmitField(label='Really delete my account!')


class DeletePitStopForm(Form):
    submit = SubmitField(label='Really delete this pitstop!')


class EditPitstopForm(Form):
    date = DateField('Date of Pitstop', validators=[date_check])
    odometer = IntegerField('Odometer (km)', validators=[odometer_check])
    litres = DecimalField('Litres (l)', places=2, validators=[litres_check])
    costs = DecimalField('Costs (€, overall)', places=2, validators=[edit_costs_check])
    submit = SubmitField(label='Update it!')
    last_pitstop = None

    def set_pitstop(self, last_pitstop):
        self.last_pitstop = last_pitstop