#
# Copyright (c) Daniel Sheffield 2021 - 2023
#
# All rights reserved
#
# THIS SOFTWARE IS PROVIDED AS IS WITHOUT WARRANTY
import itertools
from decimal import Decimal, InvalidOperation
from itertools import chain
from typing import Callable, Union
from urwid import (
    connect_signal,
    AttrMap,
    Button,
    Columns,
    Divider,
    Filler,
    LineBox,
    Padding,
    Pile,
    RadioButton,
    Text,
)

from .. import COPYRIGHT
from ..widgets import (
    AutoCompleteEdit,
    AutoCompleteFloatEdit,
    FocusWidget,
    AutoCompletePopUp,
    NoTabCheckBox,
    FlowBarGraphWithVScale,
)
from ..data.QueryManager import QueryManager
from . import ActivityManager, show_or_exit
from .Rating import Rating

class PriceCheck(FocusWidget):

    def keypress(self, size, key):
        if isinstance(key, tuple):
            return

        if getattr(self._w.original_widget, 'original_widget', None) is None:
            return super().keypress(size, key)

        if key == 'tab':
            self.advance_focus()
        elif key == 'shift tab':
            self.advance_focus(reverse=True)
        else:
            return super().keypress(size, key)

    def apply_choice(self, name, value):
        self.apply_changes(name, value)
        for k,v in self.data.items():
            if k == name or v:
                continue
            options = self.query_manager.unique_suggestions(k, **self.data)
            if len(options) == 1:
                self.apply_changes(k, list(options)[0])

    def apply_changes(self, name, value):
        self.data = {
            name: value if name != 'organic' else {
                'yes': True, 'no': False,
                True: True, False: False,
                'mixed': '',
            }[value],
        }

    @property
    def data(self):
        ret = dict(itertools.chain(
            [(k, v.get_edit_text()) for k,v in self.edit_fields.items()],
            [(k, v.state) for k,v in self.checkboxes.items()]
        ))
        return ret

    @data.setter
    def data(self, _data: dict):
        for k,v in _data.items():
            if k in self.edit_fields and v != self.edit_fields[k].get_edit_text():
                self.edit_fields[k].set_edit_text(v)
            if k in self.checkboxes and v != self.checkboxes[k].state:
                self.checkboxes[k].set_state(v)

    def clear(self):
        for (_, ef) in self.edit_fields.items():
            ef.set_edit_text('')
        for (_, cb) in self.checkboxes.items():
            cb.set_state('mixed')
        for (_, tf) in self.text_fields.items():
            tf.set_text('')
        self.graph.set_data([],0)
        return self.update()

    def update(self):
        self.update_historic_prices(self.data)
        return self

    def update_graph(self, df):
        # after truncating, need to recalculate avg(median), min, max
        df = df.sort_values(
            'ts_raw', ascending=True, ignore_index=True
        ).truncate(
            before=max(0, len(df.index)-self.graph._canvas_width)
        )
        data = df[['$/unit','quantity']].apply(
            lambda x: (float(x['$/unit']), float(x['quantity'])),
            axis=1, result_type='broadcast'
        )
        data['avg'] = (data['$/unit']*data['quantity']).sum()/data['quantity'].sum()
        data_max = data.max()['$/unit'] #.max()
        assert len(data['avg'].unique()) == 1
        norm = [ (x,) for x in data['$/unit'] ] #.to_records(index=False)
        self.graph.set_data(norm, data_max,
            vscale=[x for x in map(float, [
                data['$/unit'].min(),
                data['$/unit'].median(),
                data['avg'].iloc[0],
                data_max
            ])]
        )
        #self.graph.set_bar_width(1)
        # canvas_width = 10 + pad + pad + 10
        date_strlen = (self.graph.canvas_width - 20)
        ex = "─" if date_strlen % 2 else ""
        plen = date_strlen//2
        caption = f"{df['ts_raw'].min():%d/%m/%Y}"
        caption += f"{{p:>{plen}}}{ex}{{p:<{plen}}}".format(
            p="─")
        caption += f"{df['ts_raw'].max():%d/%m/%Y}"
        self.graph.set_caption(caption)

    def update_historic_prices(self, data):
        organic = None if data['organic'] == 'mixed' else data['organic']
        sort = '$/unit' if self.buttons['sort_price'].state else 'ts'
        product, unit = data['product'] or None, data['unit'] or None
        try:
            price = Decimal(data['price'])
        except InvalidOperation:
            price = None

        try:
            quantity = Decimal(data['quantity'])
        except InvalidOperation:
            quantity = None

        if None in (sort, product, unit):
            self.text_fields['dbview'].set_text('')
            self.rating.update_rating(None, None, None, unit)
            return

        df = self.query_manager.get_historic_prices_data(unit, sort=sort, product=product, organic=organic).dropna()
        if df.empty:
            self.text_fields['dbview'].set_text('')
            self.rating.update_rating(None, None, None, unit)
            return

        assert len(df['avg'].unique()) == 1, f"There should be only one average price: {df['avg'].unique()}"

        _avg, _min, _max = [
          float(x) for x in df[['avg','min','max']].iloc[0]
        ]
        self.rating.update_rating(_avg, _min, _max, unit, price=price, quantity=quantity)

        self.text_fields['dbview'].set_text(
            self.rating.get_historic_prices(df)
        )
        self.update_graph(df)

    def __init__(self,
        activity_manager: ActivityManager,
        query_manager: QueryManager,
    ):
        button_group = []
        self.buttons = {
          'clear': Button(('streak', 'Clear')),
          'exit': Button(('streak', 'Exit')),
          'sort_price': RadioButton(button_group, ('streak', 'Best'), state="first True"),
          'sort_date': RadioButton(button_group, ('streak', 'Last'), state="first True"),
        }
        self.edit_fields = {
          'product': AutoCompleteEdit(('bg', 'product')),
          'unit': AutoCompleteEdit(('bg', 'unit')),
          'quantity': AutoCompleteFloatEdit(('bg', 'quantity')),
          'price': AutoCompleteFloatEdit(('bg', 'price')),
        }
        self.checkboxes = {
          'organic': NoTabCheckBox(('bg', "Organic"), state='mixed'),
        }
        self.text_fields = dict((
         (k, Text('')) for k in ('dbview', 'spread', 'rating', 'marker')
        ))
        self.rating = Rating(dict(filter(
          lambda x: x[0] in ('spread','rating','marker'),
          self.text_fields.items()
        )))
        top_pane = [ 'clear', 'exit', ['sort_price', 'sort_date'], ]

        left_pane = [
            'product',
            'organic',
        ]
        badge = [
            'rating',
            'spread',
            'marker',
        ]
        right_pane = [
            'unit',
            'quantity',
            'price',
        ]
        bottom_pane = [ 'graph', 'dbview', ]

        self.query_manager = query_manager
        self.organic_checkbox = self.checkboxes['organic']
        connect_signal(self.organic_checkbox, 'postchange', lambda _,v: self.update())
        self.autocomplete_callback = lambda widget, options: len(options) and widget._emit('open', options)
        for (k, ef) in self.edit_fields.items():
            connect_signal(ef, 'postchange', lambda _,v: self.update())
            connect_signal(ef, 'apply', lambda w, name: self.autocomplete_callback(
                w, query_manager.unique_suggestions(name, **self.data)
            ))

        for b in button_group:
            connect_signal(b, 'postchange',lambda *_: self.update())

        connect_signal(self.buttons['clear'], 'click', lambda x: self.clear().update())
        connect_signal(self.buttons['exit'], 'click', lambda x: show_or_exit('esc'))
        self.graph = FlowBarGraphWithVScale(
            50, 14,
            ['bg','popup_focus', 'badge_neutral' ],
            hatt=['dark red', 'dark red', 'dark red']
        )

        self.clear()

        header = Text(u'Price Check', 'center')
        _copyright = Text(COPYRIGHT, 'center')

        banner = Pile([
            Padding(header, 'center', width=('relative', 100)),
            Padding(_copyright, 'center', width=('relative', 100)),
        ])
        banner = AttrMap(banner, 'banner')

        _widgets = dict(itertools.chain(*[
            [(k, v) for k,v in x] for x in map(lambda x: x.items(), [
                self.edit_fields, self.text_fields, self.checkboxes
            ])
        ]))

        _widgets.update([
            (k, LineBox(AttrMap(
                AutoCompletePopUp(
                    self.edit_fields[k],
                    self.apply_choice,
                    lambda: activity_manager.show(self.update())
                ), 'streak'), title=k.title(), title_align='left')
            ) for k in self.edit_fields
        ])

        _widgets.update({
            'dbview': LineBox(
                AttrMap(self.text_fields['dbview'], 'streak'),
                title="Historic Prices",
                title_align='center',
            ),
        })
        components = {
          'top_pane': Columns([
              (9, Pile([
                 Divider(),
                 AttrMap(self.buttons['clear'], 'streak'),
                 Divider(),
              ])),
              LineBox(
                Columns([ v for k,v in self.buttons.items() if 'sort' in k]),
                title="Sort price by",
                title_align='left',
              ),
              (9, Pile([
                Divider(),
                AttrMap(self.buttons['exit'], 'streak'),
                Divider(),
              ]))
            ], dividechars=1),
          'right_pane': (16, Pile(map(
            lambda x: _widgets[x] if x is not None else Divider,
            right_pane
          ))),
          'left_pane': Pile(map(
            lambda x: _widgets[x] if x is not None else Divider,
            left_pane
          )),
          'badge': Pile(map(
            lambda x: _widgets[x] if x is not None else Divider,
            badge
          )),
        }
        _widgets.update({
            'graph': LineBox(
                self.graph,
                title="Historic Price", title_align='left'
              ),
        })
        components.update({
          'bottom_pane': [ _widgets['graph'], _widgets['dbview'] ],
        })
        components.update({
          'left_pane': Pile([
            components['left_pane'],
            LineBox(
                AttrMap(components['badge'], 'badge'),
                title="Current Price", title_align='left',
            )
        ])})

        widget = Pile([
            banner,
            Divider(),
            components['top_pane'],
            Columns((components['left_pane'], components['right_pane']),
                dividechars=0,
            ),
            Pile(components['bottom_pane']),
        ])
        widget = Filler(widget, 'top')
        widget = AttrMap(widget, 'bg')
        super().__init__(widget, map(
            lambda x: next(w[1] for w in chain(
                self.buttons.items(),
                self.edit_fields.items(),
                self.checkboxes.items(),
            ) if x == w[0]),
            [
                'product', 'organic', 'unit', 'quantity', 'price',
                'clear', 'exit', 'sort_price', 'sort_date',
            ]
        ))