#-----------------------------------------------------------------------------
# Copyright (c) 2012 - 2019, Anaconda, Inc., and Bokeh Contributors.
# All rights reserved.
#
# The full license is in the file LICENSE.txt, distributed with this software.
#-----------------------------------------------------------------------------
''' Provide the numeric properties.

'''

#-----------------------------------------------------------------------------
# Boilerplate
#-----------------------------------------------------------------------------
from __future__ import absolute_import, division, print_function, unicode_literals

import logging
log = logging.getLogger(__name__)

#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------

# Standard library imports

# External imports

# Bokeh imports
from .bases import ParameterizedProperty
from .primitive import Int, Float

#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------

__all__ = (
    'Angle',
    'Byte',
    'Interval',
    'Percent',
    'Size',
)

#-----------------------------------------------------------------------------
# General API
#-----------------------------------------------------------------------------

class Interval(ParameterizedProperty):
    ''' Accept numeric values that are contained within a given interval.

    Args:
        interval_type (numeric property):
            numeric types for the range, e.g. ``Int``, ``Float``

        start (number) :
            A minimum allowable value for the range. Values less than
            ``start`` will result in validation errors.

        end (number) :
            A maximum allowable value for the range. Values greater than
            ``end`` will result in validation errors.

    Example:

        .. code-block:: python

            >>> class RangeModel(HasProps):
            ...     prop = Range(Float, 10, 20)
            ...

            >>> m = RangeModel()

            >>> m.prop = 10

            >>> m.prop = 20

            >>> m.prop = 15

            >>> m.prop = 2     # ValueError !!

            >>> m.prop = 22    # ValueError !!

            >>> m.prop = "foo" # ValueError !!

    '''
    def __init__(self, interval_type, start, end, default=None, help=None):
        self.interval_type = self._validate_type_param(interval_type)
        # Make up a property name for validation purposes
        self.interval_type.validate(start)
        self.interval_type.validate(end)
        self.start = start
        self.end = end
        super(Interval, self).__init__(default=default, help=help)

    def __str__(self):
        return "%s(%s, %r, %r)" % (self.__class__.__name__, self.interval_type, self.start, self.end)

    @property
    def type_params(self):
        return [self.interval_type]

    def validate(self, value, detail=True):
        super(Interval, self).validate(value, detail)

        if not (value is None or self.interval_type.is_valid(value) and value >= self.start and value <= self.end):
            msg = "" if not detail else "expected a value of type %s in range [%s, %s], got %r" % (self.interval_type, self.start, self.end, value)
            raise ValueError(msg)

class Byte(Interval):
    ''' Accept integral byte values (0-255).

    Example:

        .. code-block:: python

            >>> class ByteModel(HasProps):
            ...     prop = Byte(default=0)
            ...

            >>> m = ByteModel()

            >>> m.prop = 255

            >>> m.prop = 256  # ValueError !!

            >>> m.prop = 10.3 # ValueError !!

    '''
    def __init__(self, default=0, help=None):
        super(Byte, self).__init__(Int, 0, 255, default=default, help=help)

class Size(Float):
    ''' Accept non-negative numeric values.

    Args:
        default (float or None, optional) :
            A default value for attributes created from this property to
            have (default: None)

        help (str or None, optional) :
            A documentation string for this property. It will be automatically
            used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
            generating Spinx documentation. (default: None)

        serialized (bool, optional) :
            Whether attributes created from this property should be included
            in serialization (default: True)

        readonly (bool, optional) :
            Whether attributes created from this property are read-only.
            (default: False)

    Example:

        .. code-block:: python

            >>> class SizeModel(HasProps):
            ...     prop = Size()
            ...

            >>> m = SizeModel()

            >>> m.prop = 0

            >>> m.prop = 10e6

            >>> m.prop = -10   # ValueError !!

            >>> m.prop = "foo" # ValueError !!

    '''
    def validate(self, value, detail=True):
        super(Size, self).validate(value, detail)

        if not (value is None or 0.0 <= value):
            msg = "" if not detail else "expected a non-negative number, got %r" % value
            raise ValueError(msg)

class Percent(Float):
    ''' Accept floating point percentage values.

    ``Percent`` can be useful and semantically meaningful for specifying
    things like alpha values and extents.

    Args:
        default (float or None, optional) :
            A default value for attributes created from this property to
            have (default: None)

        help (str or None, optional) :
            A documentation string for this property. It will be automatically
            used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
            generating Spinx documentation. (default: None)

        serialized (bool, optional) :
            Whether attributes created from this property should be included
            in serialization (default: True)

        readonly (bool, optional) :
            Whether attributes created from this property are read-only.
            (default: False)

    Example:

        .. code-block:: python

            >>> class PercentModel(HasProps):
            ...     prop = Percent()
            ...

            >>> m = PercentModel()

            >>> m.prop = 0.0

            >>> m.prop = 0.2

            >>> m.prop = 1.0

            >>> m.prop = -2  # ValueError !!

            >>> m.prop = 5   # ValueError !!

    '''
    def validate(self, value, detail=True):
        super(Percent, self).validate(value, detail)

        if not (value is None or 0.0 <= value <= 1.0):
            msg = "" if not detail else "expected a value in range [0, 1], got %r" % value
            raise ValueError(msg)

class Angle(Float):
    ''' Accept floating point angle values.

    ``Angle`` is equivalent to :class:`~bokeh.core.properties.Float` but is
    provided for cases when it is more semantically meaningful.

    Args:
        default (float or None, optional) :
            A default value for attributes created from this property to
            have (default: None)

        help (str or None, optional) :
            A documentation string for this property. It will be automatically
            used by the :ref:`bokeh.sphinxext.bokeh_prop` extension when
            generating Spinx documentation. (default: None)

        serialized (bool, optional) :
            Whether attributes created from this property should be included
            in serialization (default: True)

        readonly (bool, optional) :
            Whether attributes created from this property are read-only.
            (default: False)

    '''
    pass

#-----------------------------------------------------------------------------
# Dev API
#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------
# Private API
#-----------------------------------------------------------------------------

#-----------------------------------------------------------------------------
# Code
#-----------------------------------------------------------------------------
