# Copyright 2018 Eficent Business and IT Consulting Services S.L.
#   (http://www.eficent.com)
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).

from datetime import datetime, timedelta

from odoo import _, api, fields, models
from odoo.tools.misc import DEFAULT_SERVER_DATE_FORMAT


class ReportStatementCommon(models.AbstractModel):
    """Abstract Report Statement for use in other models"""

    _name = "statement.common"
    _description = "Statement Reports Common"

    def _get_invoice_address(self, part):
        inv_addr_id = part.address_get(["invoice"]).get("invoice", part.id)
        return self.env["res.partner"].browse(inv_addr_id)

    def _format_date_to_partner_lang(
        self, date, date_format=DEFAULT_SERVER_DATE_FORMAT
    ):
        if isinstance(date, str):
            date = datetime.strptime(date, DEFAULT_SERVER_DATE_FORMAT)
        return date.strftime(date_format) if date else ""

    def _get_account_display_lines(
        self, company_id, partner_ids, date_start, date_end, account_type
    ):
        raise NotImplementedError

    def _get_account_initial_balance(
        self, company_id, partner_ids, date_start, account_type
    ):
        return {}

    def _show_buckets_sql_q1(self, partners, date_end, account_type):
        return str(
            self._cr.mogrify(
                """
            SELECT l.partner_id, l.currency_id, l.company_id, l.move_id,
            CASE WHEN l.balance > 0.0
                THEN l.balance - sum(coalesce(pd.amount, 0.0))
                ELSE l.balance + sum(coalesce(pc.amount, 0.0))
            END AS open_due,
            CASE WHEN l.balance > 0.0
                THEN l.amount_currency - sum(coalesce(pd.amount_currency, 0.0))
                ELSE l.amount_currency + sum(coalesce(pc.amount_currency, 0.0))
            END AS open_due_currency,
            CASE WHEN l.date_maturity is null
                THEN l.date
                ELSE l.date_maturity
            END as date_maturity
            FROM account_move_line l
            JOIN account_account_type at ON (at.id = l.user_type_id)
            JOIN account_move m ON (l.move_id = m.id)
            LEFT JOIN (SELECT pr.*
                FROM account_partial_reconcile pr
                INNER JOIN account_move_line l2
                ON pr.credit_move_id = l2.id
                WHERE l2.date <= %(date_end)s
            ) as pd ON pd.debit_move_id = l.id
            LEFT JOIN (SELECT pr.*
                FROM account_partial_reconcile pr
                INNER JOIN account_move_line l2
                ON pr.debit_move_id = l2.id
                WHERE l2.date <= %(date_end)s
            ) as pc ON pc.credit_move_id = l.id
            WHERE l.partner_id IN %(partners)s AND at.type = %(account_type)s
                                AND (
                                  (pd.id IS NOT NULL AND
                                      pd.max_date <= %(date_end)s) OR
                                  (pc.id IS NOT NULL AND
                                      pc.max_date <= %(date_end)s) OR
                                  (pd.id IS NULL AND pc.id IS NULL)
                                ) AND l.date <= %(date_end)s AND not l.blocked
                                  AND m.state IN ('posted')
            GROUP BY l.partner_id, l.currency_id, l.date, l.date_maturity,
                                l.amount_currency, l.balance, l.move_id,
                                l.company_id, l.id
        """,
                locals(),
            ),
            "utf-8",
        )

    def _show_buckets_sql_q2(self, date_end, minus_30, minus_60, minus_90, minus_120):
        return str(
            self._cr.mogrify(
                """
            SELECT partner_id, currency_id, date_maturity, open_due,
                            open_due_currency, move_id, company_id,
            CASE
                WHEN %(date_end)s <= date_maturity AND currency_id is null
                                THEN open_due
                WHEN %(date_end)s <= date_maturity AND currency_id is not null
                                THEN open_due_currency
                ELSE 0.0
            END as current,
            CASE
                WHEN %(minus_30)s < date_maturity
                    AND date_maturity < %(date_end)s
                    AND currency_id is null
                THEN open_due
                WHEN %(minus_30)s < date_maturity
                    AND date_maturity < %(date_end)s
                    AND currency_id is not null
                THEN open_due_currency
                ELSE 0.0
            END as b_1_30,
            CASE
                WHEN %(minus_60)s < date_maturity
                    AND date_maturity <= %(minus_30)s
                    AND currency_id is null
                THEN open_due
                WHEN %(minus_60)s < date_maturity
                    AND date_maturity <= %(minus_30)s
                    AND currency_id is not null
                THEN open_due_currency
                ELSE 0.0
            END as b_30_60,
            CASE
                WHEN %(minus_90)s < date_maturity
                    AND date_maturity <= %(minus_60)s
                    AND currency_id is null
                THEN open_due
                WHEN %(minus_90)s < date_maturity
                    AND date_maturity <= %(minus_60)s
                    AND currency_id is not null
                THEN open_due_currency
                ELSE 0.0
            END as b_60_90,
            CASE
                WHEN %(minus_120)s < date_maturity
                    AND date_maturity <= %(minus_90)s
                    AND currency_id is null
                THEN open_due
                WHEN %(minus_120)s < date_maturity
                    AND date_maturity <= %(minus_90)s
                    AND currency_id is not null
                THEN open_due_currency
                ELSE 0.0
            END as b_90_120,
            CASE
                WHEN date_maturity <= %(minus_120)s
                    AND currency_id is null
                THEN open_due
                WHEN date_maturity <= %(minus_120)s
                    AND currency_id is not null
                THEN open_due_currency
                ELSE 0.0
            END as b_over_120
            FROM Q1
            GROUP BY partner_id, currency_id, date_maturity, open_due,
                                open_due_currency, move_id, company_id
        """,
                locals(),
            ),
            "utf-8",
        )

    def _show_buckets_sql_q3(self, company_id):
        return str(
            self._cr.mogrify(
                """
            SELECT Q2.partner_id, current, b_1_30, b_30_60, b_60_90, b_90_120,
                                b_over_120,
            COALESCE(Q2.currency_id, c.currency_id) AS currency_id
            FROM Q2
            JOIN res_company c ON (c.id = Q2.company_id)
            WHERE c.id = %(company_id)s
        """,
                locals(),
            ),
            "utf-8",
        )

    def _show_buckets_sql_q4(self):
        return """
            SELECT partner_id, currency_id, sum(current) as current,
                                sum(b_1_30) as b_1_30,
                                sum(b_30_60) as b_30_60,
                                sum(b_60_90) as b_60_90,
                                sum(b_90_120) as b_90_120,
                                sum(b_over_120) as b_over_120
            FROM Q3
            GROUP BY partner_id, currency_id
        """

    def _get_bucket_dates(self, date_end, aging_type):
        return getattr(
            self, "_get_bucket_dates_%s" % aging_type, self._get_bucket_dates_days
        )(date_end)

    def _get_bucket_dates_days(self, date_end):
        return {
            "date_end": date_end,
            "minus_30": date_end - timedelta(days=30),
            "minus_60": date_end - timedelta(days=60),
            "minus_90": date_end - timedelta(days=90),
            "minus_120": date_end - timedelta(days=120),
        }

    def _get_bucket_dates_months(self, date_end):
        res = {}
        d = date_end
        for k in ("date_end", "minus_30", "minus_60", "minus_90", "minus_120"):
            res[k] = d
            d = d.replace(day=1) - timedelta(days=1)
        return res

    def _get_account_show_buckets(
        self, company_id, partner_ids, date_end, account_type, aging_type
    ):
        buckets = dict(map(lambda x: (x, []), partner_ids))
        partners = tuple(partner_ids)
        full_dates = self._get_bucket_dates(date_end, aging_type)
        # pylint: disable=E8103
        # All input queries are properly escaped - false positive
        self.env.cr.execute(
            """
            WITH Q1 AS (%s),
                Q2 AS (%s),
                Q3 AS (%s),
                Q4 AS (%s)
            SELECT partner_id, currency_id, current, b_1_30, b_30_60, b_60_90,
                            b_90_120, b_over_120,
                            current+b_1_30+b_30_60+b_60_90+b_90_120+b_over_120
                            AS balance
            FROM Q4
            GROUP BY partner_id, currency_id, current, b_1_30, b_30_60,
                b_60_90, b_90_120, b_over_120"""
            % (
                self._show_buckets_sql_q1(partners, date_end, account_type),
                self._show_buckets_sql_q2(
                    full_dates["date_end"],
                    full_dates["minus_30"],
                    full_dates["minus_60"],
                    full_dates["minus_90"],
                    full_dates["minus_120"],
                ),
                self._show_buckets_sql_q3(company_id),
                self._show_buckets_sql_q4(),
            )
        )
        for row in self.env.cr.dictfetchall():
            buckets[row.pop("partner_id")].append(row)
        return buckets

    def _get_bucket_labels(self, date_end, aging_type):
        return getattr(
            self, "_get_bucket_labels_%s" % aging_type, self._get_bucket_dates_days
        )(date_end)

    def _get_bucket_labels_days(self, date_end):
        return [
            _("Current"),
            _("1 - 30 Days"),
            _("31 - 60 Days"),
            _("61 - 90 Days"),
            _("91 - 120 Days"),
            _("121 Days +"),
            _("Total"),
        ]

    def _get_bucket_labels_months(self, date_end):
        return [
            _("Current"),
            _("1 Month"),
            _("2 Months"),
            _("3 Months"),
            _("4 Months"),
            _("Older"),
            _("Total"),
        ]

    def _get_line_currency_defaults(self, currency_id, currencies, balance_forward):
        if currency_id not in currencies:
            # This will only happen if currency is inactive
            currencies[currency_id] = self.env["res.currency"].browse(currency_id)
        return (
            {
                "lines": [],
                "buckets": [],
                "balance_forward": balance_forward,
                "amount_due": balance_forward,
            },
            currencies,
        )

    @api.multi
    def _get_report_values(self, docids, data):
        """
        @return: returns a dict of parameters to pass to qweb report.
          the most important pair is {'data': res} which contains all
          the data for each partner.  It is structured like:
            {partner_id: {
                'start': date string,
                'end': date_string,
                'today': date_string
                'currencies': {
                    currency_id: {
                        'lines': [{'date': date string, ...}, ...],
                        'balance_forward': float,
                        'amount_due': float,
                        'buckets': {
                            'p1': float, 'p2': ...
                  }
              }
          }
        }
        """
        company_id = data["company_id"]
        partner_ids = data["partner_ids"]
        date_start = data.get("date_start")
        if date_start and isinstance(date_start, str):
            date_start = datetime.strptime(
                date_start, DEFAULT_SERVER_DATE_FORMAT
            ).date()
        date_end = data["date_end"]
        if isinstance(date_end, str):
            date_end = datetime.strptime(date_end, DEFAULT_SERVER_DATE_FORMAT).date()
        account_type = data["account_type"]
        aging_type = data["aging_type"]
        today = fields.Date.today()
        amount_field = data.get("amount_field", "amount")

        # There should be relatively few of these, so to speed performance
        # we cache them - default needed if partner lang not set
        self._cr.execute(
            """
            SELECT p.id, l.date_format
            FROM res_partner p LEFT JOIN res_lang l ON p.lang=l.code
            WHERE p.id IN %(partner_ids)s
            """,
            {"partner_ids": tuple(partner_ids)},
        )
        date_formats = {r[0]: r[1] for r in self._cr.fetchall()}
        default_fmt = self.env["res.lang"]._lang_get(self.env.user.lang).date_format
        currencies = {x.id: x for x in self.env["res.currency"].search([])}

        res = {}
        # get base data
        lines = self._get_account_display_lines(
            company_id, partner_ids, date_start, date_end, account_type
        )
        balances_forward = self._get_account_initial_balance(
            company_id, partner_ids, date_start, account_type
        )

        if data["show_aging_buckets"]:
            buckets = self._get_account_show_buckets(
                company_id, partner_ids, date_end, account_type, aging_type
            )
            bucket_labels = self._get_bucket_labels(date_end, aging_type)
        else:
            bucket_labels = {}

        # organise and format for report
        format_date = self._format_date_to_partner_lang
        partners_to_remove = set()
        for partner_id in partner_ids:
            res[partner_id] = {
                "today": format_date(today, date_formats.get(partner_id, default_fmt)),
                "start": format_date(
                    date_start, date_formats.get(partner_id, default_fmt)
                ),
                "end": format_date(date_end, date_formats.get(partner_id, default_fmt)),
                "currencies": {},
            }
            currency_dict = res[partner_id]["currencies"]

            for line in balances_forward.get(partner_id, []):
                (
                    currency_dict[line["currency_id"]],
                    currencies,
                ) = self._get_line_currency_defaults(
                    line["currency_id"], currencies, line["balance"]
                )

            for line in lines[partner_id]:
                if line["currency_id"] not in currency_dict:
                    (
                        currency_dict[line["currency_id"]],
                        currencies,
                    ) = self._get_line_currency_defaults(
                        line["currency_id"], currencies, 0.0
                    )
                line_currency = currency_dict[line["currency_id"]]
                if not line["blocked"]:
                    line_currency["amount_due"] += line[amount_field]
                line["balance"] = line_currency["amount_due"]
                line["date"] = format_date(
                    line["date"], date_formats.get(partner_id, default_fmt)
                )
                line["date_maturity"] = format_date(
                    line["date_maturity"], date_formats.get(partner_id, default_fmt)
                )
                line_currency["lines"].append(line)

            if data["show_aging_buckets"]:
                for line in buckets[partner_id]:
                    if line["currency_id"] not in currency_dict:
                        (
                            currency_dict[line["currency_id"]],
                            currencies,
                        ) = self._get_line_currency_defaults(
                            line["currency_id"], currencies, 0.0
                        )
                    line_currency = currency_dict[line["currency_id"]]
                    line_currency["buckets"] = line

            if len(partner_ids) > 1:
                values = currency_dict.values()
                if not any([v["lines"] or v["balance_forward"] for v in values]):
                    if data["filter_non_due_partners"]:
                        partners_to_remove.add(partner_id)
                        continue
                    else:
                        res[partner_id]["no_entries"] = True
                if data["filter_negative_balances"]:
                    if not all([v["amount_due"] >= 0.0 for v in values]):
                        partners_to_remove.add(partner_id)

        for partner in partners_to_remove:
            del res[partner]
            partner_ids.remove(partner)

        return {
            "doc_ids": partner_ids,
            "doc_model": "res.partner",
            "docs": self.env["res.partner"].browse(partner_ids),
            "data": res,
            "company": self.env["res.company"].browse(company_id),
            "Currencies": currencies,
            "account_type": account_type,
            "bucket_labels": bucket_labels,
            "get_inv_addr": self._get_invoice_address,
        }