# The Mia! Accounting Project.
# Author: imacat@mail.imacat.idv.tw (imacat), 2023/4/7

#  Copyright (c) 2023 imacat.
#
#  Licensed under the Apache License, Version 2.0 (the "License");
#  you may not use this file except in compliance with the License.
#  You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
#  Unless required by applicable law or agreed to in writing, software
#  distributed under the License is distributed on an "AS IS" BASIS,
#  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#  See the License for the specific language governing permissions and
#  limitations under the License.
"""The unapplied original line items.

"""
from datetime import date
from decimal import Decimal

from flask import render_template, Response

from accounting.locale import gettext
from accounting.models import Account, JournalEntryLineItem
from accounting.report.utils.base_page_params import BasePageParams
from accounting.report.utils.base_report import BaseReport
from accounting.report.utils.csv_export import BaseCSVRow, csv_download
from accounting.report.utils.option_link import OptionLink
from accounting.report.utils.report_chooser import ReportChooser
from accounting.report.utils.report_type import ReportType
from accounting.report.utils.unapplied import get_accounts_with_unapplied
from accounting.report.utils.urls import unapplied_url
from accounting.utils.offset_matcher import OffsetMatcher
from accounting.utils.pagination import Pagination
from accounting.utils.permission import can_admin


class CSVRow(BaseCSVRow):
    """A row in the CSV."""

    def __init__(self, journal_entry_date: str | date, currency: str,
                 description: str | None, amount: str | Decimal,
                 net_balance: str | Decimal):
        """Constructs a row in the CSV.

        :param journal_entry_date: The journal entry date.
        :param currency: The currency.
        :param description: The description.
        :param amount: The amount.
        :param net_balance: The net balance.
        """
        self.date: str | date = journal_entry_date
        """The date."""
        self.currency: str = currency
        """The currency."""
        self.description: str | None = description
        """The description."""
        self.amount: str | Decimal = amount
        """The amount."""
        self.net_balance: str | Decimal = net_balance
        """The net balance."""

    @property
    def values(self) -> list[str | date | Decimal | None]:
        """Returns the values of the row.

        :return: The values of the row.
        """
        return [self.date, self.currency, self.description, self.amount,
                self.net_balance]


class PageParams(BasePageParams):
    """The HTML page parameters."""

    def __init__(self, account: Account,
                 is_mark_matches: bool,
                 pagination: Pagination[JournalEntryLineItem],
                 line_items: list[JournalEntryLineItem]):
        """Constructs the HTML page parameters.

        :param account: The account.
        :param is_mark_matches: Whether to mark the matched offsets.
        :param pagination: The pagination.
        :param line_items: The line items.
        """
        self.account: Account = account
        """The account."""
        self.pagination: Pagination[JournalEntryLineItem] = pagination
        """The pagination."""
        self.line_items: list[JournalEntryLineItem] = line_items
        """The line items."""
        self.is_mark_matches: bool = is_mark_matches
        """Whether to mark the matched offsets."""

    @property
    def has_data(self) -> bool:
        """Returns whether there is any data on the page.

        :return: True if there is any data, or False otherwise.
        """
        return len(self.line_items) > 0

    @property
    def report_chooser(self) -> ReportChooser:
        """Returns the report chooser.

        :return: The report chooser.
        """
        return ReportChooser(ReportType.UNAPPLIED,
                             account=self.account)

    @property
    def account_options(self) -> list[OptionLink]:
        """Returns the account options.

        :return: The account options.
        """
        options: list[OptionLink] = [OptionLink(gettext("Accounts"),
                                                unapplied_url(None),
                                                False)]
        options.extend([OptionLink(str(x),
                                   unapplied_url(x),
                                   x.id == self.account.id)
                        for x in get_accounts_with_unapplied()])
        return options


def get_csv_rows(line_items: list[JournalEntryLineItem]) -> list[CSVRow]:
    """Composes and returns the CSV rows from the line items.

    :param line_items: The line items.
    :return: The CSV rows.
    """
    rows: list[CSVRow] = [CSVRow(gettext("Date"), gettext("Currency"),
                                 gettext("Description"), gettext("Amount"),
                                 gettext("Net Balance"))]
    rows.extend([CSVRow(x.journal_entry.date, x.currency.code,
                        x.description, x.amount, x.net_balance)
                 for x in line_items])
    return rows


class UnappliedOriginalLineItems(BaseReport):
    """The unapplied original line items."""

    def __init__(self, account: Account):
        """Constructs the unapplied original line items.

        :param account: The account.
        """
        self.__account: Account = account
        """The account."""
        offset_matcher: OffsetMatcher = OffsetMatcher(self.__account)
        self.__line_items: list[JournalEntryLineItem] \
            = offset_matcher.unapplied
        """The line items."""
        self.__is_mark_matches: bool \
            = can_admin() and len(offset_matcher.unmatched_offsets) > 0
        """Whether to mark the matched offsets."""

    def csv(self) -> Response:
        """Returns the report as CSV for download.

        :return: The response of the report for download.
        """
        filename: str = f"unapplied-{self.__account.code}.csv"
        return csv_download(filename, get_csv_rows(self.__line_items))

    def html(self) -> str:
        """Composes and returns the report as HTML.

        :return: The report as HTML.
        """
        pagination: Pagination[JournalEntryLineItem] \
            = Pagination[JournalEntryLineItem](self.__line_items,
                                               is_reversed=True)
        params: PageParams = PageParams(account=self.__account,
                                        is_mark_matches=self.__is_mark_matches,
                                        pagination=pagination,
                                        line_items=pagination.list)
        return render_template("accounting/report/unapplied.html",
                               report=params)