# Copyright (c) Jupyter Development Team.
# Distributed under the terms of the Modified BSD License.

"""Test interact and interactive."""

from __future__ import print_function

try:
    from unittest.mock import patch
except ImportError:
    from mock import patch

import os
from collections import OrderedDict
import pytest

import ipywidgets as widgets

from traitlets import TraitError
from ipywidgets import (interact, interact_manual, interactive,
    interaction, Output)
from ipython_genutils.py3compat import annotate

#-----------------------------------------------------------------------------
# Utility stuff
#-----------------------------------------------------------------------------

from .utils import setup, teardown

def f(**kwargs):
    pass

displayed = []
@pytest.fixture()
def clear_display():
    global displayed
    displayed = []

def record_display(*args):
    displayed.extend(args)

#-----------------------------------------------------------------------------
# Actual tests
#-----------------------------------------------------------------------------

def check_widget(w, **d):
    """Check a single widget against a dict"""
    for attr, expected in d.items():
        if attr == 'cls':
            assert w.__class__ is expected
        else:
            value = getattr(w, attr)
            assert value == expected, "%s.%s = %r != %r" % (w.__class__.__name__, attr, value, expected)

            # For numeric values, the types should match too
            if isinstance(value, (int, float)):
                tv = type(value)
                te = type(expected)
                assert tv is te, "type(%s.%s) = %r != %r" % (w.__class__.__name__, attr, tv, te)

def check_widgets(container, **to_check):
    """Check that widgets are created as expected"""
    # build a widget dictionary, so it matches
    widgets = {}
    for w in container.children:
        if not isinstance(w, Output):
            widgets[w.description] = w

    for key, d in to_check.items():
        assert key in widgets
        check_widget(widgets[key], **d)


def test_single_value_string():
    a = u'hello'
    c = interactive(f, a=a)
    w = c.children[0]
    check_widget(w,
        cls=widgets.Text,
        description='a',
        value=a,
    )

def test_single_value_bool():
    for a in (True, False):
        c = interactive(f, a=a)
        w = c.children[0]
        check_widget(w,
            cls=widgets.Checkbox,
            description='a',
            value=a,
        )

def test_single_value_float():
    for a in (2.25, 1.0, -3.5, 0.0):
        if not a:
            expected_min = 0.0
            expected_max = 1.0
        elif a > 0:
            expected_min = -a
            expected_max = 3*a
        else:
            expected_min = 3*a
            expected_max = -a
        c = interactive(f, a=a)
        w = c.children[0]
        check_widget(w,
            cls=widgets.FloatSlider,
            description='a',
            value=a,
            min=expected_min,
            max=expected_max,
            step=0.1,
            readout=True,
        )

def test_single_value_int():
    for a in (1, 5, -3, 0):
        if not a:
            expected_min = 0
            expected_max = 1
        elif a > 0:
            expected_min = -a
            expected_max = 3*a
        else:
            expected_min = 3*a
            expected_max = -a
        c = interactive(f, a=a)
        assert len(c.children) == 2
        w = c.children[0]
        check_widget(w,
            cls=widgets.IntSlider,
            description='a',
            value=a,
            min=expected_min,
            max=expected_max,
            step=1,
            readout=True,
        )

def test_list_str():
    values = ['hello', 'there', 'guy']
    first = values[0]
    c = interactive(f, lis=values)
    assert len(c.children) == 2
    d = dict(
        cls=widgets.Dropdown,
        value=first,
        options=tuple(values),
        _options_labels=tuple(values),
        _options_values=tuple(values),
    )
    check_widgets(c, lis=d)

def test_list_int():
    values = [3, 1, 2]
    first = values[0]
    c = interactive(f, lis=values)
    assert len(c.children) == 2
    d = dict(
        cls=widgets.Dropdown,
        value=first,
        options=tuple(values),
        _options_labels=tuple(str(v) for v in values),
        _options_values=tuple(values),
    )
    check_widgets(c, lis=d)

def test_list_tuple():
    values = [(3, 300), (1, 100), (2, 200)]
    first = values[0][1]
    c = interactive(f, lis=values)
    assert len(c.children) == 2
    d = dict(
        cls=widgets.Dropdown,
        value=first,
        options=tuple(values),
        _options_labels=("3", "1", "2"),
        _options_values=(300, 100, 200),
    )
    check_widgets(c, lis=d)

def test_list_tuple_invalid():
    for bad in [
        (),
    ]:
        with pytest.raises(ValueError):
            print(bad) # because there is no custom message in assert_raises
            c = interactive(f, tup=bad)

def test_dict():
    for d in [
        dict(a=5),
        dict(a=5, b='b', c=dict),
    ]:
        c = interactive(f, d=d)
        w = c.children[0]
        check = dict(
            cls=widgets.Dropdown,
            description='d',
            value=next(iter(d.values())),
            options=d,
            _options_labels=tuple(d.keys()),
            _options_values=tuple(d.values()),
        )
        check_widget(w, **check)


def test_ordereddict():
    from collections import OrderedDict
    items = [(3, 300), (1, 100), (2, 200)]
    first = items[0][1]
    values = OrderedDict(items)
    c = interactive(f, lis=values)
    assert len(c.children) == 2
    d = dict(
        cls=widgets.Dropdown,
        value=first,
        options=values,
        _options_labels=("3", "1", "2"),
        _options_values=(300, 100, 200),
    )
    check_widgets(c, lis=d)

def test_iterable():
    def yield_values():
        yield 3
        yield 1
        yield 2
    first = next(yield_values())
    c = interactive(f, lis=yield_values())
    assert len(c.children) == 2
    d = dict(
        cls=widgets.Dropdown,
        value=first,
        options=(3, 1, 2),
        _options_labels=("3", "1", "2"),
        _options_values=(3, 1, 2),
    )
    check_widgets(c, lis=d)

def test_iterable_tuple():
    values = [(3, 300), (1, 100), (2, 200)]
    first = values[0][1]
    c = interactive(f, lis=iter(values))
    assert len(c.children) == 2
    d = dict(
        cls=widgets.Dropdown,
        value=first,
        options=tuple(values),
        _options_labels=("3", "1", "2"),
        _options_values=(300, 100, 200),
    )
    check_widgets(c, lis=d)

def test_mapping():
    try:
        # Python 3
        from collections.abc import Mapping
    except ImportError:
        # Python 2
        from collections import Mapping
    class TestMapping(Mapping):
        def __init__(self, values):
            self.values = values
        def __getitem__(self):
            raise NotImplementedError
        def __len__(self):
            raise NotImplementedError
        def __iter__(self):
            raise NotImplementedError
        def items(self):
            return self.values

    items = [(3, 300), (1, 100), (2, 200)]
    first = items[0][1]
    values = TestMapping(items)
    c = interactive(f, lis=values)
    assert len(c.children) == 2
    d = dict(
        cls=widgets.Dropdown,
        value=first,
        options=tuple(items),
        _options_labels=("3", "1", "2"),
        _options_values=(300, 100, 200),
    )
    check_widgets(c, lis=d)


def test_defaults():
    @annotate(n=10)
    def f(n, f=4.5, g=1):
        pass

    c = interactive(f)
    check_widgets(c,
        n=dict(
            cls=widgets.IntSlider,
            value=10,
        ),
        f=dict(
            cls=widgets.FloatSlider,
            value=4.5,
        ),
        g=dict(
            cls=widgets.IntSlider,
            value=1,
        ),
    )

def test_default_values():
    @annotate(n=10, f=(0, 10.), g=5, h=OrderedDict([('a',1), ('b',2)]), j=['hi', 'there'])
    def f(n, f=4.5, g=1, h=2, j='there'):
        pass

    c = interactive(f)
    check_widgets(c,
        n=dict(
            cls=widgets.IntSlider,
            value=10,
        ),
        f=dict(
            cls=widgets.FloatSlider,
            value=4.5,
        ),
        g=dict(
            cls=widgets.IntSlider,
            value=5,
        ),
        h=dict(
            cls=widgets.Dropdown,
            options=OrderedDict([('a',1), ('b',2)]),
            value=2
        ),
        j=dict(
            cls=widgets.Dropdown,
            options=('hi', 'there'),
            value='there'
        ),
    )

def test_default_out_of_bounds():
    @annotate(f=(0, 10.), h={'a': 1}, j=['hi', 'there'])
    def f(f='hi', h=5, j='other'):
        pass

    c = interactive(f)
    check_widgets(c,
        f=dict(
            cls=widgets.FloatSlider,
            value=5.,
        ),
        h=dict(
            cls=widgets.Dropdown,
            options={'a': 1},
            value=1,
        ),
        j=dict(
            cls=widgets.Dropdown,
            options=('hi', 'there'),
            value='hi',
        ),
    )

def test_annotations():
    @annotate(n=10, f=widgets.FloatText())
    def f(n, f):
        pass

    c = interactive(f)
    check_widgets(c,
        n=dict(
            cls=widgets.IntSlider,
            value=10,
        ),
        f=dict(
            cls=widgets.FloatText,
        ),
    )

def test_priority():
    @annotate(annotate='annotate', kwarg='annotate')
    def f(kwarg='default', annotate='default', default='default'):
        pass

    c = interactive(f, kwarg='kwarg')
    check_widgets(c,
        kwarg=dict(
            cls=widgets.Text,
            value='kwarg',
        ),
        annotate=dict(
            cls=widgets.Text,
            value='annotate',
        ),
    )

def test_decorator_kwarg(clear_display):
    with patch.object(interaction, 'display', record_display):
        @interact(a=5)
        def foo(a):
            pass
    assert len(displayed) == 1
    w = displayed[0].children[0]
    check_widget(w,
        cls=widgets.IntSlider,
        value=5,
    )

def test_interact_instancemethod(clear_display):
    class Foo(object):
        def show(self, x):
            print(x)

    f = Foo()

    with patch.object(interaction, 'display', record_display):
        g = interact(f.show, x=(1,10))
    assert len(displayed) == 1
    w = displayed[0].children[0]
    check_widget(w,
        cls=widgets.IntSlider,
        value=5,
    )

def test_decorator_no_call(clear_display):
    with patch.object(interaction, 'display', record_display):
        @interact
        def foo(a='default'):
            pass
    assert len(displayed) == 1
    w = displayed[0].children[0]
    check_widget(w,
        cls=widgets.Text,
        value='default',
    )

def test_call_interact(clear_display):
    def foo(a='default'):
        pass
    with patch.object(interaction, 'display', record_display):
        ifoo = interact(foo)
    assert len(displayed) == 1
    w = displayed[0].children[0]
    check_widget(w,
        cls=widgets.Text,
        value='default',
    )

def test_call_interact_on_trait_changed_none_return(clear_display):
    def foo(a='default'):
        pass
    with patch.object(interaction, 'display', record_display):
        ifoo = interact(foo)
    assert len(displayed) == 1
    w = displayed[0].children[0]
    check_widget(w,
        cls=widgets.Text,
        value='default',
    )
    with patch.object(interaction, 'display', record_display):
        w.value = 'called'
    assert len(displayed) == 1

def test_call_interact_kwargs(clear_display):
    def foo(a='default'):
        pass
    with patch.object(interaction, 'display', record_display):
        ifoo = interact(foo, a=10)
    assert len(displayed) == 1
    w = displayed[0].children[0]
    check_widget(w,
        cls=widgets.IntSlider,
        value=10,
    )

def test_call_decorated_on_trait_change(clear_display):
    """test calling @interact decorated functions"""
    d = {}
    with patch.object(interaction, 'display', record_display):
        @interact
        def foo(a='default'):
            d['a'] = a
            return a
    assert len(displayed) == 1
    w = displayed[0].children[0]
    check_widget(w,
        cls=widgets.Text,
        value='default',
    )
    # test calling the function directly
    a = foo('hello')
    assert a == 'hello'
    assert d['a'] == 'hello'

    # test that setting trait values calls the function
    with patch.object(interaction, 'display', record_display):
        w.value = 'called'
    assert d['a'] == 'called'
    assert len(displayed) == 2
    assert w.value == displayed[-1]

def test_call_decorated_kwargs_on_trait_change(clear_display):
    """test calling @interact(foo=bar) decorated functions"""
    d = {}
    with patch.object(interaction, 'display', record_display):
        @interact(a='kwarg')
        def foo(a='default'):
            d['a'] = a
            return a
    assert len(displayed) == 1
    w = displayed[0].children[0]
    check_widget(w,
        cls=widgets.Text,
        value='kwarg',
    )
    # test calling the function directly
    a = foo('hello')
    assert a == 'hello'
    assert d['a'] == 'hello'

    # test that setting trait values calls the function
    with patch.object(interaction, 'display', record_display):
        w.value = 'called'
    assert d['a'] == 'called'
    assert len(displayed) == 2
    assert w.value == displayed[-1]



def test_fixed():
    c = interactive(f, a=widgets.fixed(5), b='text')
    assert len(c.children) == 2
    w = c.children[0]
    check_widget(w,
        cls=widgets.Text,
        value='text',
        description='b',
    )

def test_default_description():
    c = interactive(f, b='text')
    w = c.children[0]
    check_widget(w,
        cls=widgets.Text,
        value='text',
        description='b',
    )

def test_custom_description():
    d = {}
    def record_kwargs(**kwargs):
        d.clear()
        d.update(kwargs)

    c = interactive(record_kwargs, b=widgets.Text(value='text', description='foo'))
    w = c.children[0]
    check_widget(w,
        cls=widgets.Text,
        value='text',
        description='foo',
    )
    w.value = 'different text'
    assert d == {'b': 'different text'}

def test_interact_manual_button():
    c = interact.options(manual=True).widget(f)
    w = c.children[0]
    check_widget(w, cls=widgets.Button)

def test_interact_manual_nocall():
    callcount = 0
    def calltest(testarg):
        callcount += 1
    c = interact.options(manual=True)(calltest, testarg=5).widget
    c.children[0].value = 10
    assert callcount == 0

def test_interact_call():
    w = interact.widget(f)
    w.update()

    w = interact_manual.widget(f)
    w.update()

def test_interact_options():
    def f(x):
        return x
    w = interact.options(manual=False).options(manual=True)(f, x=21).widget
    assert w.manual == True

    w = interact_manual.options(manual=False).options()(x=21).widget(f)
    assert w.manual == False

    w = interact(x=21)().options(manual=True)(f).widget
    assert w.manual == True

def test_interact_options_bad():
    with pytest.raises(ValueError):
        interact.options(bad="foo")

def test_int_range_logic():
    irsw = widgets.IntRangeSlider
    w = irsw(value=(2, 4), min=0, max=6)
    check_widget(w, cls=irsw, value=(2, 4), min=0, max=6)
    w.upper = 3
    w.max = 3
    check_widget(w, cls=irsw, value=(2, 3), min=0, max=3)

    w.min = 0
    w.max = 6
    w.lower = 2
    w.upper = 4
    check_widget(w, cls=irsw, value=(2, 4), min=0, max=6)
    w.value = (0, 1) #lower non-overlapping range
    check_widget(w, cls=irsw, value=(0, 1), min=0, max=6)
    w.value = (5, 6) #upper non-overlapping range
    check_widget(w, cls=irsw, value=(5, 6), min=0, max=6)
    w.lower = 2
    check_widget(w, cls=irsw, value=(2, 6), min=0, max=6)

    with pytest.raises(TraitError):
        w.min = 7
    with pytest.raises(TraitError):
        w.max = -1

    w = irsw(min=2, max=3, value=(2, 3))
    check_widget(w, min=2, max=3, value=(2, 3))
    w = irsw(min=100, max=200, value=(125, 175))
    check_widget(w, value=(125, 175))

    with pytest.raises(TraitError):
        irsw(min=2, max=1)


def test_float_range_logic():
    frsw = widgets.FloatRangeSlider
    w = frsw(value=(.2, .4), min=0., max=.6)
    check_widget(w, cls=frsw, value=(.2, .4), min=0., max=.6)

    w.min = 0.
    w.max = .6
    w.lower = .2
    w.upper = .4
    check_widget(w, cls=frsw, value=(.2, .4), min=0., max=.6)
    w.value = (0., .1) #lower non-overlapping range
    check_widget(w, cls=frsw, value=(0., .1), min=0., max=.6)
    w.value = (.5, .6) #upper non-overlapping range
    check_widget(w, cls=frsw, value=(.5, .6), min=0., max=.6)
    w.lower = .2
    check_widget(w, cls=frsw, value=(.2, .6), min=0., max=.6)

    with pytest.raises(TraitError):
        w.min = .7
    with pytest.raises(TraitError):
        w.max = -.1

    w = frsw(min=2, max=3, value=(2.2, 2.5))
    check_widget(w, min=2., max=3.)

    with pytest.raises(TraitError):
        frsw(min=.2, max=.1)


def test_multiple_selection():
    smw = widgets.SelectMultiple

    # degenerate multiple select
    w = smw()
    check_widget(w, value=tuple())

    # don't accept random other value when no options
    with pytest.raises(TraitError):
        w.value = (2,)
    check_widget(w, value=tuple())

    # basic multiple select
    w = smw(options=[(1, 1)], value=[1])
    check_widget(w, cls=smw, value=(1,), options=((1, 1),))

    # don't accept random other value
    with pytest.raises(TraitError):
        w.value = w.value + (2,)
    check_widget(w, value=(1,))

    # change options, which resets value
    w.options = w.options + ((2, 2),)
    check_widget(w, options=((1, 1), (2,2)), value=())

    # change value
    w.value = (1,2)
    check_widget(w, value=(1, 2))

    # dict style
    w.options = {1: 1}
    check_widget(w, options={1:1})

    # updating
    with pytest.raises(TraitError):
        w.value = (2,)
    check_widget(w, options={1:1})


def test_interact_noinspect():
    a = u'hello'
    c = interactive(dict, a=a)
    w = c.children[0]
    check_widget(w,
        cls=widgets.Text,
        description='a',
        value=a,
    )


def test_get_interact_value():
    from ipywidgets.widgets import ValueWidget
    from traitlets import Unicode
    class TheAnswer(ValueWidget):
        _model_name = Unicode('TheAnswer')
        description = Unicode()
        def get_interact_value(self):
            return 42
    w = TheAnswer()
    c = interactive(lambda v: v, v=w)
    c.update()
    assert c.result == 42

def test_state_schema():
    from ipywidgets.widgets import IntSlider, Widget
    import json
    import jsonschema
    s = IntSlider()
    state = Widget.get_manager_state(drop_defaults=True)
    import yatest.common as yc
    with open(yc.source_path('contrib/python/ipywidgets/py2/ipywidgets/state.schema.json')) as f:
        schema = json.load(f)
    jsonschema.validate(state, schema)

