"""core.py - Common data classes for reporting functionality"""

# Copyright © 2020  Brett Smith

#

# This program is free software: you can redistribute it and/or modify

# it under the terms of the GNU Affero General Public License as published by

# the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU Affero General Public License for more details.

#

# You should have received a copy of the GNU Affero General Public License

# along with this program.  If not, see <https://www.gnu.org/licenses/>.

import abc

import collections

import datetime

import itertools

import operator

import re

import babel.core  # type:ignore[import]

import babel.numbers  # type:ignore[import]

import odf.config  # type:ignore[import]

import odf.element  # type:ignore[import]

import odf.number  # type:ignore[import]

import odf.opendocument  # type:ignore[import]

import odf.style  # type:ignore[import]

import odf.table  # type:ignore[import]

import odf.text  # type:ignore[import]

from decimal import Decimal

from pathlib import Path

from beancount.core import amount as bc_amount

from .. import data

from typing import (

    cast,

    overload,

    Any,

    BinaryIO,

    Callable,

    DefaultDict,

    Dict,

    Generic,

    Iterable,

    Iterator,

    List,

    Mapping,

    MutableMapping,

    Optional,

    Sequence,

    Set,

    Tuple,

    Type,

    TypeVar,

    Union,

)

from ..beancount_types import (

    MetaKey,

    MetaValue,

)

DecimalCompat = data.DecimalCompat

BalanceType = TypeVar('BalanceType', bound='Balance')

ElementType = Callable[..., odf.element.Element]

LinkType = Union[str, Tuple[str, Optional[str]]]

RelatedType = TypeVar('RelatedType', bound='RelatedPostings')

RT = TypeVar('RT', bound=Sequence)

ST = TypeVar('ST')

T = TypeVar('T')

class Balance(Mapping[str, data.Amount]):

    """A collection of amounts mapped by currency

    Each key is a Beancount currency string, and each value represents the

    balance in that currency.

    """

    __slots__ = ('_currency_map', 'tolerance')

    TOLERANCE = Decimal('0.01')

    def __init__(self,

                 source: Iterable[data.Amount]=(),

                 tolerance: Optional[Decimal]=None,

    ) -> None:

        if tolerance is None:

            tolerance = self.TOLERANCE

        self.tolerance = tolerance

        self._currency_map: Dict[str, data.Amount] = {}

        for amount in source:

            self._add_amount(self._currency_map, amount)

    def _add_amount(self,

                    currency_map: MutableMapping[str, data.Amount],

                    amount: data.Amount,

    ) -> None:

        code = amount.currency

        try:

            current_number = currency_map[code].number

        except KeyError:

            current_number = Decimal(0)

        currency_map[code] = data.Amount(current_number + amount.number, code)

    def _add_other(self,

                   currency_map: MutableMapping[str, data.Amount],

                   other: Union[data.Amount, 'Balance'],

    ) -> None:

        if isinstance(other, Balance):

            for amount in other.values():

                self._add_amount(currency_map, amount)

        else:

            self._add_amount(currency_map, other)

    def __repr__(self) -> str:

        values = [repr(amt) for amt in self.values()]

        return f"{type(self).__name__}({values!r})"

    def __str__(self) -> str:

        return self.format()

    def __abs__(self: BalanceType) -> BalanceType:

        return type(self)(bc_amount.abs(amt) for amt in self.values())

    def __add__(self: BalanceType, other: Union[data.Amount, 'Balance']) -> BalanceType:

        retval_map = self._currency_map.copy()

        self._add_other(retval_map, other)

        return type(self)(retval_map.values())

    def __eq__(self, other: Any) -> bool:

        if isinstance(other, Balance):

            clean_self = self.clean_copy()

            clean_other = other.clean_copy()

            return len(clean_self) == len(clean_other) and all(

                clean_self[key] == clean_other.get(key) for key in clean_self

            )

        else:

            return super().__eq__(other)

    def __neg__(self: BalanceType) -> BalanceType:

        return type(self)(-amt for amt in self.values())

    def __pos__(self: BalanceType) -> BalanceType:

        return self

    def __getitem__(self, key: str) -> data.Amount:

        return self._currency_map[key]

    def __iter__(self) -> Iterator[str]:

        return iter(self._currency_map)

    def __len__(self) -> int:

        return len(self._currency_map)

    def _all_amounts(self,

                     op_func: Callable[[DecimalCompat, DecimalCompat], bool],

                     operand: DecimalCompat,

    ) -> bool:

        return all(op_func(amt.number, operand) for amt in self.values())

    def copy(self: BalanceType) -> BalanceType:

        return type(self)(self.values())

    def clean_copy(self: BalanceType, tolerance: Optional[Decimal]=None) -> BalanceType:

        if tolerance is None:

            tolerance = self.tolerance

        return type(self)(

            amount for amount in self.values()

            if abs(amount.number) >= tolerance

        )

    @staticmethod

    def within_tolerance(dec: DecimalCompat, tolerance: DecimalCompat) -> bool:

        dec = cast(Decimal, dec)

        return abs(dec) < tolerance

    def eq_zero(self) -> bool:

        """Returns true if all amounts in the balance == 0, within tolerance."""

        return self._all_amounts(self.within_tolerance, self.tolerance)

    is_zero = eq_zero

    def ge_zero(self) -> bool:

        """Returns true if all amounts in the balance >= 0, within tolerance."""

        op_func = operator.gt if self.tolerance else operator.ge

        return self._all_amounts(op_func, -self.tolerance)

    def le_zero(self) -> bool:

        """Returns true if all amounts in the balance <= 0, within tolerance."""

        op_func = operator.lt if self.tolerance else operator.le

        return self._all_amounts(op_func, self.tolerance)

    def format(self,

               fmt: Optional[str]='#,#00.00 ¤¤',

               sep: str=', ',

               empty: str="Zero balance",

    ) -> str:

        """Formats the balance as a string with the given parameters

        If you set ``fmt`` to None, amounts will be formatted according to the

        user's locale. The default format is Beancount's input format.

        """

        if not amounts:

            return empty

        amounts.sort(key=lambda amt: abs(amt.number), reverse=True)

        return sep.join(

            babel.numbers.format_currency(amt.number, amt.currency, fmt)

            for amt in amounts

        )

class MutableBalance(Balance):

    __slots__ = ()

    def __iadd__(self: BalanceType, other: Union[data.Amount, Balance]) -> BalanceType:

        self._add_other(self._currency_map, other)

        return self

class RelatedPostings(Sequence[data.Posting]):

    """Collect and query related postings

    This class provides common functionality for collecting related postings

    and running queries on them: iterating over them, tallying their balance,

    etc.

    This class doesn't know anything about how the postings are related. That's

    entirely up to the caller.

    A common pattern is to use this class with collections.defaultdict

    to organize postings based on some key. See the group_by_meta classmethod

    for an example.

    """

    __slots__ = ('_postings',)

    def __init__(self,

                 source: Iterable[data.Posting]=(),

                 *,

                 _can_own: bool=False,

    ) -> None:

        self._postings: List[data.Posting]

        if _can_own and isinstance(source, list):

            self._postings = source

        else:

            self._postings = list(source)

    @classmethod

    def group_by_meta(cls: Type[RelatedType],

                      postings: Iterable[data.Posting],

                      key: MetaKey,

                      default: Optional[MetaValue]=None,

    ) -> Iterator[Tuple[Optional[MetaValue], RelatedType]]:

        """Relate postings by metadata value

        This method takes an iterable of postings and returns a mapping.

        The keys of the mapping are the values of post.meta.get(key, default).

        The values are RelatedPostings instances that contain all the postings

        that had that same metadata value.

        """

        mapping: DefaultDict[Optional[MetaValue], List[data.Posting]] = collections.defaultdict(list)

        for post in postings:

            mapping[post.meta.get(key, default)].append(post)

        for value, posts in mapping.items():

            yield value, cls(posts, _can_own=True)

    def __repr__(self) -> str:

        return f'<{type(self).__name__} {self._postings!r}>'

    @overload

    def __getitem__(self: RelatedType, index: int) -> data.Posting: ...

    @overload

    def __getitem__(self: RelatedType, s: slice) -> RelatedType: ...

    def __getitem__(self: RelatedType,

                    index: Union[int, slice],

    ) -> Union[data.Posting, RelatedType]:

        if isinstance(index, slice):

            return type(self)(self._postings[index], _can_own=True)

        else:

            return self._postings[index]

    def __len__(self) -> int:

        return len(self._postings)

    def all_meta_links(self, key: MetaKey) -> Set[str]:

        retval: Set[str] = set()

        for post in self:

            try:

                retval.update(post.meta.get_links(key))

            except TypeError:

                pass

        return retval

    def iter_with_balance(self) -> Iterator[Tuple[data.Posting, Balance]]:

        balance = MutableBalance()

        for post in self:

            balance += post.units

            yield post, balance

    def balance(self) -> Balance:

        for _, balance in self.iter_with_balance():

            pass

        try:

            return balance

        except NameError:

            return Balance()

    def balance_at_cost(self) -> Balance:

        balance = MutableBalance()

        for post in self:

            if post.cost is None:

                balance += post.units

            else:

                number = post.units.number * post.cost.number

                balance += data.Amount(number, post.cost.currency)

        return balance

    def meta_values(self,

                    key: MetaKey,

                    default: Optional[MetaValue]=None,

    ) -> Set[Optional[MetaValue]]:

        return {post.meta.get(key, default) for post in self}

class BaseSpreadsheet(Generic[RT, ST], metaclass=abc.ABCMeta):

    """Abstract base class to help write spreadsheets

    This class provides the very core logic to write an arbitrary set of data

    rows to arbitrary output. It calls hooks when it starts writing the

    spreadsheet, starts a new "section" of rows, ends a section, and ends the

    spreadsheet.

    RT is the type of the input data rows. ST is the type of the section

    identifier that you create from each row. If you don't want to use the

    section logic at all, set ST to None and define section_key to return None.

    """

    @abc.abstractmethod

    def section_key(self, row: RT) -> ST:

        """Return the section a row belongs to

        Given a data row, this method should return some identifier for the

        "section" the row belongs to. The write method uses this to

        determine when to call start_section and end_section.

        If your spreadsheet doesn't need sections, define this to return None.

        """

        ...

    @abc.abstractmethod

    def write_row(self, row: RT) -> None:

        """Write a data row to the output spreadsheet

        This method is called once for each data row in the input.

        """

        ...

    # The next four methods are all called by the write method when the name

    # says. You may override them to output headers or sums, record

    # state, etc. The default implementations are all noops.

    def start_spreadsheet(self) -> None:

        pass

    def start_section(self, key: ST) -> None:

        pass

    def end_section(self, key: ST) -> None:

        pass

    def end_spreadsheet(self) -> None:

        pass

    def write(self, rows: Iterable[RT]) -> None:

        prev_section: Optional[ST] = None

        self.start_spreadsheet()

        for row in rows:

            section = self.section_key(row)

            if section != prev_section:

                if prev_section is not None:

                    self.end_section(prev_section)

                self.start_section(section)

                prev_section = section

            self.write_row(row)

        try:

            should_end = section is not None

        except NameError:

            should_end = False

        if should_end:

            self.end_section(section)

        self.end_spreadsheet()

class BaseODS(BaseSpreadsheet[RT, ST], metaclass=abc.ABCMeta):

    """Abstract base class to help write OpenDocument spreadsheets

    This class provides the very core logic to write an arbitrary set of data

    rows to an OpenDocument spreadsheet. It provides helper methods for

    building sheets, rows, and cells.

    See also the BaseSpreadsheet base class for additional documentation about

    methods you must and can define, the definition of RT and ST, etc.

    """

    def __init__(self) -> None:

        self.locale = babel.core.Locale.default('LC_MONETARY')

        self.currency_fmt_key = 'accounting'

        self._name_counter = itertools.count(1)

        self._currency_style_cache: MutableMapping[str, odf.style.Style] = {}

        self.document = odf.opendocument.OpenDocumentSpreadsheet()

        self.init_settings()

        self.init_styles()

        self.sheet = self.use_sheet("Report")

    ### Low-level document tree manipulation

    # The *intent* is that you only need to use these if you're adding new

    # methods to manipulate document settings or styles.

    def copy_element(self, elem: odf.element.Element) -> odf.element.Element:

        qattrs = dict(self.iter_qattributes(elem))

        retval = odf.element.Element(qname=elem.qname, qattributes=qattrs)

        try:

            orig_name = retval.getAttribute('name')

        except ValueError:

            orig_name = None

        if orig_name is not None:

            retval.setAttribute('name', f'{orig_name}{next(self._name_counter)}')

        return retval

    def ensure_child(self,

                     parent: odf.element.Element,

                     child_type: ElementType,

                     **kwargs: Any,

    ) -> odf.element.Element:

        new_child = child_type(**kwargs)

        found_child = self.find_child(parent, new_child)

        if found_child is None:

            parent.addElement(new_child)

            return parent.lastChild

        else:

            return found_child

    def ensure_config_map_entry(self,

                                root: odf.element.Element,

                                map_name: str,

                                entry_name: str,

    ) -> odf.element.Element:

        """Return a ``ConfigItemMapEntry`` under ``root``

        This method ensures there's a ``ConfigItemMapNamed`` named ``map_name``

        under ``root``, and a ``ConfigItemMapEntry`` named ``entry_name`` under

        that. Return the ``ConfigItemMapEntry`` element.

        """

        config_map = self.ensure_child(root, odf.config.ConfigItemMapNamed, name=map_name)

        return self.ensure_child(config_map, odf.config.ConfigItemMapEntry, name=entry_name)

    def find_child(self,

                   parent: odf.element.Element,

                   child: odf.element.Element,

    ) -> Optional[odf.element.Element]:

        attrs = {k: v for k, v in self.iter_attributes(child)}

        if not attrs:

            return None

        for elem in parent.childNodes:

            if (elem.qname == child.qname

                and all(elem.getAttribute(k) == v for k, v in attrs.items())):

                return elem

        return None

    def iter_attributes(self, elem: odf.element.Element) -> Iterator[Tuple[str, str]]:

        for (_, key), value in self.iter_qattributes(elem):

            yield key.lower().replace('-', ''), value

    def iter_qattributes(self, elem: odf.element.Element) -> Iterator[Tuple[Tuple[str, str], str]]:

        if elem.attributes:

            yield from elem.attributes.items()

    def replace_child(self,

                     parent: odf.element.Element,

                     child_type: ElementType,

                     **kwargs: Any,

    ) -> odf.element.Element:

        new_child = child_type(**kwargs)

        found_child = self.find_child(parent, new_child)

        parent.insertBefore(new_child, found_child)

        if found_child is not None:

            parent.removeChild(found_child)

        return new_child

    def set_config(self,

                   root: odf.element.Element,

                   name: str,

                   value: Union[bool, int, str],

                   config_type: Optional[str]=None,

    ) -> None:

        """Ensure ``root`` has a ``ConfigItem`` with the given name, type, and value"""

        value_s = str(value)

        if isinstance(value, bool):

            value_s = str(value).lower()

            default_type = 'boolean'

        elif isinstance(value, str):

            default_type = 'string'

        if config_type is None:

            try:

                config_type = default_type

            except NameError:

                raise ValueError(

                    f"need config_type for {type(value).__name__} value",

                ) from None

        item = self.replace_child(

            root, odf.config.ConfigItem, name=name, type=config_type,

        )

        item.addText(value_s)

    ### Styles

    def _build_currency_style(

            self,

            root: odf.element.Element,

            locale: babel.core.Locale,

            code: str,

            fmt_index: int,

            properties: Optional[odf.style.TextProperties]=None,

            *,

            fmt_key: Optional[str]=None,

            volatile: bool=False,

            minintegerdigits: int=1,

    ) -> odf.element.Element:

        if fmt_key is None:

            fmt_key = self.currency_fmt_key

        pattern = locale.currency_formats[fmt_key]

        fmts = pattern.pattern.split(';')

        try:

            fmt = fmts[fmt_index]

        except IndexError:

            fmt = fmts[0]

            grouping = pattern.grouping[0]

        else:

            grouping = pattern.grouping[fmt_index]

        zero_s = babel.numbers.format_currency(0, code, '##0.0', locale)

        try:

            decimal_index = zero_s.rindex('.') + 1

        except ValueError:

            decimalplaces = 0

        else:

            decimalplaces = len(zero_s) - decimal_index

        style = self.replace_child(

            root,

            odf.number.CurrencyStyle,

            name=f'{code}{next(self._name_counter)}',

        )

        style.setAttribute('volatile', 'true' if volatile else 'false')

        if properties is not None:

            style.addElement(properties)

        for part in re.split(r"(¤+|[#0,.]+|'[^']+')", fmt):

            if not part:

                pass

            elif not part.strip('#0,.'):

                style.addElement(odf.number.Number(

                    decimalplaces=str(decimalplaces),

                    grouping='true' if grouping else 'false',

                    minintegerdigits=str(minintegerdigits),

                ))

            elif part == '¤':

                style.addElement(odf.number.CurrencySymbol(

                    country=locale.territory,

                    language=locale.language,

                    text=babel.numbers.get_currency_symbol(code, locale),

                ))

            elif part == '¤¤':

                style.addElement(odf.number.Text(text=code))

            else:

                style.addElement(odf.number.Text(text=part.strip("'")))

        return style

    def currency_style(

            self,

            code: str,

            locale: Optional[babel.core.Locale]=None,

            negative_properties: Optional[odf.style.TextProperties]=None,

            positive_properties: Optional[odf.style.TextProperties]=None,

            root: odf.element.Element=None,

    ) -> odf.style.Style:

        """Create and return a spreadsheet style to format currency data

        Given a currency code and a locale, this method will create all the

        styles necessary to format the currency according to the locale's

        rules, including rendering of decimal points and negative values.

        You may optionally pass in TextProperties to use for negative and

        positive amounts, respectively. If you don't, negative values will

        automatically be rendered in red (text color #f00).

        Results are cached. If you repeatedly call this method with the same

        arguments, you'll keep getting the same style returned, which will

        only be added to the document once.

        """

        if locale is None:

            locale = self.locale

        if negative_properties is None:

            negative_properties = odf.style.TextProperties(color='#ff0000')

        if root is None:

            root = self.document.styles

        cache_parts = [str(id(root)), code, str(locale)]

        for key, value in self.iter_attributes(negative_properties):

            cache_parts.append(f'{key}={value}')

        if positive_properties is not None:

            cache_parts.append('')

            for key, value in self.iter_attributes(positive_properties):

                cache_parts.append(f'{key}={value}')

        cache_key = '\0'.join(cache_parts)

        try:

            style = self._currency_style_cache[cache_key]

        except KeyError:

            pos_style = self._build_currency_style(

                root, locale, code, 0, positive_properties, volatile=True,

            )

            curr_style = self._build_currency_style(

                root, locale, code, 1, negative_properties,

            )

            curr_style.addElement(odf.style.Map(

                condition='value()>=0', applystylename=pos_style,

            ))

            style = self.ensure_child(

                self.document.styles,

                odf.style.Style,

                name=f'{curr_style.getAttribute("name")}Cell',

                family='table-cell',

                datastylename=curr_style,

            )

            self._currency_style_cache[cache_key] = style

        return style

    def _merge_style_iter_names(

            self,

            styles: Sequence[Union[str, odf.style.Style, None]],

    ) -> Iterator[str]:

        for source in styles:

            if source is None:

                continue

            elif not isinstance(source, str):

                source = source.getAttribute('name')

            if source.startswith('Merge_'):

                orig_names = iter(source.split('_'))

                next(orig_names)

                yield from orig_names

            else:

                yield source

    def _merge_styles(self,

                      new_style: odf.style.Style,

                      sources: Iterable[odf.style.Style],

    ) -> None:

        for elem in sources:

            for key, new_value in self.iter_attributes(elem):

                old_value = new_style.getAttribute(key)

                if (key == 'name'

                    or key == 'displayname'

                    or old_value == new_value):

                    pass

                elif old_value is None:

                    new_style.setAttribute(key, new_value)

                else:

                    raise ValueError(f"cannot merge styles with conflicting {key}")

            for child in elem.childNodes:

                new_style.addElement(self.copy_element(child))

    def merge_styles(self,

                     *styles: Union[str, odf.style.Style, None],

    ) -> Optional[odf.style.Style]:

        """Create a new style from multiple existing styles

        Given any number of existing styles, create a new style that combines

        all of those styles' attributes and properties, add it to the document

        styles, and return it.

        Styles can be specified by name, or by passing in their Style element.

        For convenience, you can also pass in None as an argument; None will

        simply be skipped.

        Results are cached. If you repeatedly call this method with the same

        arguments, you'll keep getting the same style returned, which will

        only be added to the document once.

        If you pass in zero real style arguments, returns None.

        If you pass in one style argument, returns that style unchanged.

        If you pass in a style that doesn't already exist in the document,

        or if you pass in styles that can't be merged (because they have

        conflicting attributes), raises ValueError.

        """

        name_map: Dict[str, odf.style.Style] = {}

        for name in self._merge_style_iter_names(styles):

            source = odf.style.Style(name=name)

            found = self.find_child(self.document.styles, source)

            if found is None:

                raise ValueError(f"no style named {name!r}")

            name_map[name] = found

        if not name_map:

            retval = None

        elif len(name_map) == 1:

            _, retval = name_map.popitem()

        else:

            new_name = f'Merge_{"_".join(sorted(name_map))}'

            retval = self.ensure_child(

                self.document.styles, odf.style.Style, name=new_name,

            )

            if retval.firstChild is None:

                self._merge_styles(retval, name_map.values())

        return retval

    ### Sheets

    def lock_first_row(self, sheet: Optional[odf.table.Table]=None) -> None:

        """Lock the first row of cells under the given sheet

        This method sets all the appropriate settings to "lock" the first row

        of cells in a sheet, so it stays in view even as the viewer scrolls

        through rows. If a sheet is not given, works on ``self.sheet``.

        """

        if sheet is None:

            sheet = self.sheet

        config_map = self.ensure_config_map_entry(

            self.view, 'Tables', sheet.getAttribute('name'),

        )

        self.set_config(config_map, 'PositionBottom', 1, 'int')

        self.set_config(config_map, 'VerticalSplitMode', 2, 'short')

        self.set_config(config_map, 'VerticalSplitPosition', 1, 'short')

    def use_sheet(self, name: str) -> odf.table.Table:

        """Switch the active sheet ``self.sheet`` to the one with the given name

        If there is no sheet with the given name, create it and append it to

        the spreadsheet first.

        If the current active sheet is empty when this method is called, it

        will be removed from the spreadsheet.

        """

        try:

            empty_sheet = not self.sheet.hasChildNodes()

        except AttributeError:

            empty_sheet = False

        if empty_sheet:

            self.document.spreadsheet.removeChild(self.sheet)

        self.sheet = self.ensure_child(

            self.document.spreadsheet, odf.table.Table, name=name,

        )

        return self.sheet

    ### Initialization hooks

    def init_settings(self) -> None:

        """Hook called to initialize settings

        This method is called by __init__ to populate

        ``self.document.settings``. This implementation creates the barest

        skeleton structure necessary to support other methods, in particular

        ``lock_first_row``.

        """

        view_settings = self.ensure_child(

            self.document.settings, odf.config.ConfigItemSet, name='ooo:view-settings',

        )

        views = self.ensure_child(

            view_settings, odf.config.ConfigItemMapIndexed, name='Views',

        )

        self.view = self.ensure_child(views, odf.config.ConfigItemMapEntry)

        self.set_config(self.view, 'ViewId', 'view1')

    def init_styles(self) -> None:

        """Hook called to initialize settings

        This method is called by __init__ to populate

        ``self.document.styles``. This implementation creates basic building

        block cell styles often used in financial reports.

        """

        styles = self.document.styles

        self.style_bold = self.ensure_child(

            styles, odf.style.Style, name='Bold', family='table-cell',

        )

        self.ensure_child(

            self.style_bold, odf.style.TextProperties, fontweight='bold',

        )

        self.style_starttext: odf.style.Style

        self.style_centertext: odf.style.Style

        self.style_endtext: odf.style.Style

        for textalign in ['start', 'center', 'end']:

            aligned_style = self.replace_child(

                styles, odf.style.Style, name=f'{textalign.title()}Text',

            )

            aligned_style.setAttribute('family', 'table-cell')

            aligned_style.addElement(odf.style.ParagraphProperties(textalign=textalign))

            setattr(self, f'style_{textalign}text', aligned_style)

        date_style = self.replace_child(styles, odf.number.DateStyle, name='ISODate')

        date_style.addElement(odf.number.Year(style='long'))

        date_style.addElement(odf.number.Text(text='-'))

        date_style.addElement(odf.number.Month(style='long'))

        date_style.addElement(odf.number.Text(text='-'))

        date_style.addElement(odf.number.Day(style='long'))

        self.style_date = self.ensure_child(

            styles,

            odf.style.Style,

            name=f'{date_style.getAttribute("name")}Cell',

            family='table-cell',

            datastylename=date_style,

        )

        self.style_dividerline = self.ensure_child(

            styles, odf.style.Style, name='DividerLine', family='table-cell',

        )

        self.ensure_child(

            self.style_dividerline,

            odf.style.TableCellProperties,

            borderbottom='1pt solid #0000ff',

        )

    ### Rows and cells

    def add_row(self, *cells: odf.table.TableCell, **attrs: Any) -> odf.table.TableRow:

        row = odf.table.TableRow(**attrs)

        for cell in cells:

            row.addElement(cell)

        self.sheet.addElement(row)

        return row

    def balance_cell(self, balance: Balance, **attrs: Any) -> odf.table.TableCell:

        if balance.is_zero():

            return self.float_cell(0, **attrs)

        elif len(balance) == 1:

            amount = next(iter(balance.values()))

            attrs['stylename'] = self.merge_styles(

                attrs.get('stylename'), self.currency_style(amount.currency),

            )

            return self.currency_cell(amount, **attrs)

        else:

            lines = [babel.numbers.format_currency(

                number, currency, locale=self.locale, format_type=self.currency_fmt_key,

            ) for number, currency in balance.values()]

            attrs['stylename'] = self.merge_styles(

                attrs.get('stylename'), self.style_endtext,

            )

            return self.multiline_cell(lines, **attrs)

    def currency_cell(self, amount: data.Amount, **attrs: Any) -> odf.table.TableCell:

        number, currency = amount

        cell = odf.table.TableCell(valuetype='currency', value=number, **attrs)

        cell.addElement(odf.text.P(text=babel.numbers.format_currency(

            number, currency, locale=self.locale, format_type=self.currency_fmt_key,

        )))

        return cell

    def date_cell(self, date: datetime.date, **attrs: Any) -> odf.table.TableCell:

        attrs.setdefault('stylename', self.style_date)

        cell = odf.table.TableCell(valuetype='date', datevalue=date, **attrs)

        cell.addElement(odf.text.P(text=date.isoformat()))

        return cell

    def float_cell(self, value: Union[int, float, Decimal], **attrs: Any) -> odf.table.TableCell:

        cell = odf.table.TableCell(valuetype='float', value=value, **attrs)

        cell.addElement(odf.text.P(text=str(value)))

        return cell

    def multiline_cell(self, lines: Iterable[Any], **attrs: Any) -> odf.table.TableCell:

        cell = odf.table.TableCell(valuetype='string', **attrs)

        for line in lines: