#
# 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,
    Text,
)

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

class TransactionEditor(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)
        elif key == 'ctrl delete':
            self.clear()
            self.focus_on(self.edit_fields['product'])
        elif key == 'insert':
            self.save_and_clear_cb()
        elif key == 'ctrl p':
            self.focus_on(self.edit_fields['product'])
        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 and k != 'ts':
                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 (k, ef) in self.edit_fields.items():
            if k in ('ts', 'store',):
                continue
            ef.set_edit_text('')
        for (_, cb) in self.checkboxes.items():
            cb.set_state('mixed')
        for (k, tf) in self.text_fields.items():
            if k != 'dbview':
                tf.set_text('')
        self.graph.set_data([],0)
        return self.update()

    def update(self):
        data = self.data
        date, store = data['ts'], data['store']
        self.text_fields['dbview'].set_text(
            self.query_manager.get_session_transactions(date, store) if None not in (
                date or None, store or None
            ) else ''
        )
        self.update_historic_prices(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 (product, unit):
            self.rating.update_rating(None, None, None, unit)
            return

        df = self.query_manager.get_historic_prices_data(unit, product=product, organic=organic, sort='ts')
        if df.empty:
            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()}"

        # all time (or all data) avg(mean), min, max
        _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.update_graph(df)

    def autocomplete_callback(self, widget, name, options):
        if len(options):
            widget._emit('open', options)
            return
        
        new_product_activity = self.activity_manager.get('new_product')
        current_activity = self.activity_manager.current()
        if current_activity is not new_product_activity and name in (
            'product', 'category', 'group'
        ):
            self.new_product_callback(name)
        return
    
    def new_product_callback(self, name):
        cur = self.activity_manager.current()
        txn = self.activity_manager.get('transaction')
        new_product = self.activity_manager.create(
            NewProduct, 'new_product',
            self.activity_manager, self.query_manager,
            cur, name, txn.data,
            txn.apply_changes,
        )
        self.activity_manager.show(new_product)

    def save_and_clear_callback(self):
        txn = self.activity_manager.get('transaction')
        self.activity_manager.app.save(txn.data)
        txn.clear()
        txn.focus_on(txn.edit_fields['product'])
        self.activity_manager.show(txn.update())

    def __init__(self,
        activity_manager: ActivityManager,
        query_manager: QueryManager,
    ):
        self.activity_manager = activity_manager
        self.query_manager = query_manager
        self.buttons = {
            'done': Button(('streak', u'Done')),
            'clear': Button(('streak', u'Clear')),
        }
        self.edit_fields = {
            'ts': AutoCompleteEdit(('bg', 'ts')),
            'store': AutoCompleteEdit(('bg', 'store')),
            'product': AutoCompleteEdit(('bg', 'product')),
            'category': AutoCompleteEdit(('bg', 'category')),
            'group': AutoCompleteEdit(('bg', 'group')),
            'description': AutoCompleteEdit(('bg', 'description')),
            'unit': AutoCompleteEdit(('bg', 'unit')),
            'quantity': AutoCompleteFloatEdit(('bg', 'quantity')),
            'price': AutoCompleteFloatEdit(('bg', 'price')),
        }
        self.checkboxes = {
            'organic': NoTabCheckBox(('bg', "Organic"), state='mixed'),
        }
        self.text_fields = {
            'dbview': Text(''),
            'rating': Text(''),
            'spread': Text(''),
            'marker': Text(''),
        }
        self.graph = FlowBarGraphWithVScale(
            50, 14,
            ['bg','popup_focus', 'badge_neutral' ],
            hatt=['dark red', 'dark red', 'dark red']
        )
        self.rating = Rating(dict(filter(
            lambda x: x[0] in ('spread','rating','marker'),
            self.text_fields.items()
        )))
        self.organic_checkbox = self.checkboxes['organic']
        connect_signal(self.organic_checkbox, 'postchange', lambda _,v: self.update())
        layout = [
            [ 'ts',          'store',     ],
            [ 'organic',     'product',   ],
            [ 'category',    'group',     ],
        ]
        side_pane = [
            'unit',
            'quantity',
            'price',
        ]
        bottom_pane = [
            'description',
            'dbview',
        ]
        badge = [
            'rating',
            'spread',
            'marker',
        ]
        self.clear()
        _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({
            'dbview': LineBox(
                AttrMap(self.text_fields['dbview'], 'streak'),
                title="Session Data",
                title_align='left',
            )
        })
        for (k, ef) in self.edit_fields.items():
            connect_signal(ef, 'postchange', lambda *_: self.update())
            connect_signal(ef, 'apply', lambda w, name: self.autocomplete_callback(
                w, name, query_manager.unique_suggestions(name, **self.data)
            ))

        _widgets.update(dict([
            (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 if k != 'product'
        ]))
        header = Text(u'Fill Transaction', 'center')
        _copyright = Text(COPYRIGHT, 'center')

        components = {
            'bottom_button_bar': Columns(
                [(8, self.buttons['done']), Divider(), (9, self.buttons['clear'])]
            ),
            'badge': Pile(map(
                lambda x: _widgets[x] if x is not None else Divider,
                badge
            )),
        }
        components.update({
            'bottom_pane': Columns([
                Pile(map(
                    lambda x: _widgets[x] if x is not None else Divider(),
                    bottom_pane
                )),
                (self.graph.total_width+2, Pile([
                    LineBox(
                        AttrMap(components['badge'], 'badge'),
                        title="Current Price", title_align='left',
                    ),
                    LineBox(
                        self.graph,
                        title="Historic Price", title_align='left'
                    ),
                ])),
            ])
        })
        connect_signal(self.buttons['done'], 'click', lambda _: self.save_and_clear_callback())
        connect_signal(self.buttons['clear'], 'click', lambda _: self.clear())

        banner = Pile([
            Padding(header, 'center', width=('relative', 100)),
            Padding(_copyright, 'center', width=('relative', 100)),
        ])
        banner = AttrMap(banner, 'banner')
        _widgets.update({
            'product': LineBox(Columns([
                AttrMap(AutoCompletePopUp(
                    self.edit_fields['product'],
                    self.apply_choice,
                    lambda: activity_manager.show(self.update())
                ), 'streak'),
                self.organic_checkbox
            ], dividechars=2), title='Product', title_align='left')
        })

        components['side_pane'] = (12, Pile([
            _widgets[r] if r is not None else Divider() for r in side_pane
        ]))
        components['main_pane'] = []
        for _, r in enumerate(layout):
            col = []
            for c in r:
                if c is not None:
                    if c == 'organic':
                        continue
                    col.append(_widgets[c])
                else:
                    col.append(Divider())
            components['main_pane'].append(Columns(col))

        components['main_pane'] = Pile(components['main_pane'])

        widget = Pile([
            banner,
            Divider(),
            Columns([
                components['main_pane'], components['side_pane']
            ], dividechars=2),
            components['bottom_pane'],
            Divider(),
            components['bottom_button_bar']
        ])
        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',
                'description',
                'done', 'clear',
                'category', 'group',
                'ts', 'store'
            ]))