import param
import pandas as pd
import datetime as dt

class BaseClass(param.Parameterized):
    x                       = param.Parameter(default=3.14, doc="X position")
    y                       = param.Parameter(default="Not editable", constant=True)
    string_value            = param.String(default="str", doc="A string")
    num_int                 = param.Integer(50000, bounds=(-200, 100000))
    unbounded_int           = param.Integer(23)
    float_with_hard_bounds  = param.Number(8.2, bounds=(7.5, 10))
    float_with_soft_bounds  = param.Number(0.5, bounds=(0, None), softbounds=(0,2))
    unbounded_float         = param.Number(30.01, precedence=0)
    hidden_parameter        = param.Number(2.718, precedence=-1)
    integer_range           = param.Range(default=(3, 7), bounds=(0, 10))
    float_range             = param.Range(default=(0, 1.57), bounds=(0, 3.145))
    dictionary              = param.Dict(default={"a": 2, "b": 9})


class Example(BaseClass):
    """An example Parameterized class"""
    timestamps = []

    boolean                 = param.Boolean(True, doc="A sample Boolean parameter")
    color                   = param.Color(default='#FFFFFF')
    date                    = param.Date(dt.datetime(2017, 1, 1),
                                         bounds=(dt.datetime(2017, 1, 1), dt.datetime(2017, 2, 1)))
    dataframe               = param.DataFrame(pd._testing.makeDataFrame().iloc[:3])
    select_string           = param.ObjectSelector(default="yellow", objects=["red", "yellow", "green"])
    select_fn               = param.ObjectSelector(default=list,objects=[list, set, dict])
    int_list                = param.ListSelector(default=[3, 5], objects=[1, 3, 5, 7, 9], precedence=0.5)
    single_file             = param.FileSelector(path='../../*/*.py*', precedence=0.5)
    multiple_files          = param.MultiFileSelector(path='../../*/*.py?', precedence=0.5)
    record_timestamp        = param.Action(lambda x: x.timestamps.append(dt.datetime.utcnow()), 
                                           doc="""Record timestamp.""", precedence=0.7)
    
Example.num_int

import panel as pn

pn.extension()

base = BaseClass()
pn.Row(Example.param, base.param)

Example.unbounded_int

Example.num_int

Example.int_list = [1, 7]

Example.timestamps

pn.Row(Example.param.float_range, Example.param.num_int)

class CustomExample(param.Parameterized):
    """An example Parameterized class"""

    select_string = param.Selector(objects=["red", "yellow", "green"])
    autocomplete_string = param.Selector(default='', objects=["red", "yellow", "green"], check_on_set=False)
    select_number = param.Selector(objects=[0, 1, 10, 100])


pn.Param(CustomExample.param, widgets={
    'select_string': pn.widgets.RadioButtonGroup,
    'autocomplete_string': pn.widgets.AutocompleteInput,
    'select_number': pn.widgets.DiscretePlayer}
)

pn.Param(CustomExample.param, widgets={
    'select_string': {'widget_type': pn.widgets.RadioButtonGroup, 'button_type': 'success'},
    'autocomplete_string': {'widget_type': pn.widgets.AutocompleteInput, 'placeholder': 'Find a color...'},
    'select_number': pn.widgets.DiscretePlayer}
)

pn.widgets.IntSlider.from_param(Example.param.unbounded_int, start=0, end=100)

pn.Param(CustomExample.param, name="Custom Name")

pn.Param(CustomExample.param, sort=True, name="Sort by Label Example")

def sort_func(x):
    return len(x[1].label)
pn.Param(CustomExample.param, sort=sort_func, name="Sort by Label Length Example")

import numpy as np


class Sine(param.Parameterized):

    phase = param.Number(default=0, bounds=(0, np.pi))

    frequency = param.Number(default=1, bounds=(0.1, 2))

    @param.depends('phase', 'frequency')
    def view(self):
        y = np.sin(np.linspace(0, np.pi * 3, 40) * self.frequency + self.phase)
        y = ((y - y.min()) / y.ptp()) * 20
        array = np.array(
            [list((' ' * (int(round(d)) - 1) + '*').ljust(20)) for d in y])
        return pn.pane.Str('\n'.join([''.join(r) for r in array.T]), height=380, width=500)


sine = Sine(name='ASCII Sine Wave')
pn.Row(sine.param, sine.view)

pn.Row(pn.panel(sine.param, parameters=['phase']), sine.view)

class GoogleMapViewer(param.Parameterized):
    
    continent = param.ObjectSelector(default='Asia', objects=['Africa', 'Asia', 'Europe'])
    
    country = param.ObjectSelector(default='China', objects=['China', 'Thailand', 'Japan'])
    
    _countries = {'Africa': ['Ghana', 'Togo', 'South Africa', 'Tanzania'],
                  'Asia'  : ['China', 'Thailand', 'Japan'],
                  'Europe': ['Austria', 'Bulgaria', 'Greece', 'Portugal', 'Switzerland']}
    
    @param.depends('continent', watch=True)
    def _update_countries(self):
        countries = self._countries[self.continent]
        self.param['country'].objects = countries
        self.country = countries[0]

    @param.depends('country')
    def view(self):
        iframe = """
        <iframe width="800" height="400" src="https://maps.google.com/maps?q={country}&z=6&output=embed"
        frameborder="0" scrolling="no" marginheight="0" marginwidth="0"></iframe>
        """.format(country=self.country)
        return pn.pane.HTML(iframe, height=400)
        
viewer = GoogleMapViewer(name='Google Map Viewer')
pn.Row(viewer.param, viewer.view)

from bokeh.plotting import figure


class Shape(param.Parameterized):

    radius = param.Number(default=1, bounds=(0, 1))

    def __init__(self, **params):
        super(Shape, self).__init__(**params)
        self.figure = figure(x_range=(-1, 1), y_range=(-1, 1))
        self.renderer = self.figure.line(*self._get_coords())

    def _get_coords(self):
        return [], []

    def view(self):
        return self.figure


class Circle(Shape):

    n = param.Integer(default=100, precedence=-1)

    def _get_coords(self):
        angles = np.linspace(0, 2 * np.pi, self.n + 1)
        return (self.radius * np.sin(angles),
                self.radius * np.cos(angles))

    @param.depends('radius', watch=True)
    def update(self):
        xs, ys = self._get_coords()
        self.renderer.data_source.data.update({'x': xs, 'y': ys})


class NGon(Circle):

    n = param.Integer(default=3, bounds=(3, 10), precedence=1)

    @param.depends('radius', 'n', watch=True)
    def update(self):
        xs, ys = self._get_coords()
        self.renderer.data_source.data.update({'x': xs, 'y': ys})

shapes = [NGon(), Circle()]

class ShapeViewer(param.Parameterized):
    
    shape = param.ObjectSelector(default=shapes[0], objects=shapes)
    
    @param.depends('shape')
    def view(self):
        return self.shape.view()
    
    @param.depends('shape', 'shape.radius')
    def title(self):
        return '## %s (radius=%.1f)' % (type(self.shape).__name__, self.shape.radius)
    
    def panel(self):
        return pn.Column(self.title, self.view)

viewer = ShapeViewer()

pn.Row(viewer.param, viewer.panel())

viewer = ShapeViewer()

expand_layout = pn.Column()

pn.Row(
    pn.Column(
        pn.panel(viewer.param, expand_button=False, expand=True, expand_layout=expand_layout),
        "#### Subobject parameters:",
        expand_layout),
    viewer.panel())

class QueryExample(param.Parameterized):
    
    integer = param.Integer(default=None, bounds=(0, 10))
    
    string = param.String(default='A string')

pn.state.location.sync(QueryExample, {'integer': 'int', 'string': 'str'})

QueryExample.integer = 5