# 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 flectra.tools.misc import DEFAULT_SERVER_DATE_FORMAT
from flectra import api, fields, models


class CustomerOutstandingStatement(models.AbstractModel):
    """Model of Customer Outstanding Statement"""

    _name = 'report.customer_outstanding_statement.statement'

    def _format_date_to_partner_lang(self, str_date, partner_id):
        lang_code = self.env['res.partner'].browse(partner_id).lang
        lang = self.env['res.lang']._lang_get(lang_code)
        date = datetime.strptime(str_date, DEFAULT_SERVER_DATE_FORMAT).date()
        return date.strftime(lang.date_format)

    def _display_lines_sql_q1(self, partners, date_end, account_type):
        return """
            SELECT m.name as move_id, l.partner_id, l.date, l.name,
                            l.ref, l.blocked, l.currency_id, l.company_id,
            CASE WHEN (l.currency_id is not null AND l.amount_currency > 0.0)
                THEN avg(l.amount_currency)
                ELSE avg(l.debit)
            END as debit,
            CASE WHEN (l.currency_id is not null AND l.amount_currency < 0.0)
                THEN avg(l.amount_currency * (-1))
                ELSE avg(l.credit)
            END as credit,
            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_amount,
            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_amount_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 <= '%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 <= '%s'
            ) as pc ON pc.credit_move_id = l.id
            WHERE l.partner_id IN (%s) AND at.type = '%s'
                                AND (
                                  (pd.id IS NOT NULL AND
                                      pd.max_date <= '%s') OR
                                  (pc.id IS NOT NULL AND
                                      pc.max_date <= '%s') OR
                                  (pd.id IS NULL AND pc.id IS NULL)
                                ) AND l.date <= '%s'
            GROUP BY l.partner_id, m.name, l.date, l.date_maturity, l.name,
                                l.ref, l.blocked, l.currency_id,
                                l.balance, l.amount_currency, l.company_id
        """ % (date_end, date_end, partners, account_type, date_end,
               date_end, date_end)

    def _display_lines_sql_q2(self):
        return """
            SELECT Q1.partner_id, Q1.currency_id, Q1.move_id,
            Q1.date, Q1.date_maturity, Q1.debit, Q1.credit,
            Q1.name, Q1.ref, Q1.blocked, Q1.company_id,
            CASE WHEN Q1.currency_id is not null
                    THEN open_amount_currency
                    ELSE open_amount
            END as open_amount
            FROM Q1
        """

    def _display_lines_sql_q3(self, company_id):
        return """
            SELECT Q2.partner_id, Q2.move_id, Q2.date, Q2.date_maturity,
            Q2.name, Q2.ref, Q2.debit, Q2.credit,
            Q2.debit-Q2.credit AS amount, blocked,
            COALESCE(Q2.currency_id, c.currency_id) AS currency_id,
            Q2.open_amount
            FROM Q2
            JOIN res_company c ON (c.id = Q2.company_id)
            WHERE c.id = %s
        """ % company_id

    def _get_account_display_lines(self, company_id, partner_ids, date_end,
                                   account_type):
        res = dict(map(lambda x: (x, []), partner_ids))
        partners = ', '.join([str(i) for i in partner_ids])
        date_end = datetime.strptime(
            date_end, DEFAULT_SERVER_DATE_FORMAT).date()
        # pylint: disable=E8103
        self.env.cr.execute("""
        WITH Q1 AS (%s), Q2 AS (%s), Q3 AS (%s)
        SELECT partner_id, currency_id, move_id, date, date_maturity, debit,
                            credit, amount, open_amount, name, ref, blocked
        FROM Q3
        ORDER BY date, date_maturity, move_id""" % (
            self._display_lines_sql_q1(partners, date_end, account_type),
            self._display_lines_sql_q2(),
            self._display_lines_sql_q3(company_id)))
        for row in self.env.cr.dictfetchall():
            res[row.pop('partner_id')].append(row)
        return res

    def _show_buckets_sql_q1(self, partners, date_end, account_type):
        return """
            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 <= '%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 <= '%s'
            ) as pc ON pc.credit_move_id = l.id
            WHERE l.partner_id IN (%s) AND at.type = '%s'
                                AND (
                                  (pd.id IS NOT NULL AND
                                      pd.max_date <= '%s') OR
                                  (pc.id IS NOT NULL AND
                                      pc.max_date <= '%s') OR
                                  (pd.id IS NULL AND pc.id IS NULL)
                                ) AND l.date <= '%s' AND not l.blocked
            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
        """ % (date_end, date_end, partners, account_type, date_end,
               date_end, date_end)

    def _show_buckets_sql_q2(self, date_end, minus_30, minus_60, minus_90,
                             minus_120):
        return """
            SELECT partner_id, currency_id, date_maturity, open_due,
                            open_due_currency, move_id, company_id,
            CASE
                WHEN '%s' <= date_maturity AND currency_id is null
                                THEN open_due
                WHEN '%s' <= date_maturity AND currency_id is not null
                                THEN open_due_currency
                ELSE 0.0
            END as current,
            CASE
                WHEN '%s' < date_maturity AND date_maturity < '%s'
                                AND currency_id is null THEN open_due
                WHEN '%s' < date_maturity AND date_maturity < '%s'
                                AND currency_id is not null
                                THEN open_due_currency
                ELSE 0.0
            END as b_1_30,
            CASE
                WHEN '%s' < date_maturity AND date_maturity <= '%s'
                                AND currency_id is null THEN open_due
                WHEN '%s' < date_maturity AND date_maturity <= '%s'
                                AND currency_id is not null
                                THEN open_due_currency
                ELSE 0.0
            END as b_30_60,
            CASE
                WHEN '%s' < date_maturity AND date_maturity <= '%s'
                                AND currency_id is null THEN open_due
                WHEN '%s' < date_maturity AND date_maturity <= '%s'
                                AND currency_id is not null
                                THEN open_due_currency
                ELSE 0.0
            END as b_60_90,
            CASE
                WHEN '%s' < date_maturity AND date_maturity <= '%s'
                                AND currency_id is null THEN open_due
                WHEN '%s' < date_maturity AND date_maturity <= '%s'
                                AND currency_id is not null
                                THEN open_due_currency
                ELSE 0.0
            END as b_90_120,
            CASE
                WHEN date_maturity <= '%s' AND currency_id is null
                                THEN open_due
                WHEN date_maturity <= '%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
        """ % (date_end, date_end, minus_30, date_end, minus_30, date_end,
               minus_60, minus_30, minus_60, minus_30, minus_90, minus_60,
               minus_90, minus_60, minus_120, minus_90, minus_120, minus_90,
               minus_120, minus_120)

    def _show_buckets_sql_q3(self, company_id):
        return """
            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 = %s
        """ % company_id

    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):
        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_account_show_buckets(self, company_id, partner_ids, date_end,
                                  account_type):
        res = dict(map(lambda x: (x, []), partner_ids))
        partners = ', '.join([str(i) for i in partner_ids])
        date_end = datetime.strptime(
            date_end, DEFAULT_SERVER_DATE_FORMAT).date()
        full_dates = self._get_bucket_dates(date_end)
        # pylint: disable=E8103
        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():
            res[row.pop('partner_id')].append(row)
        return res

    @api.multi
    def get_report_values(self, docids, data):
        company_id = data['company_id']
        partner_ids = data['partner_ids']
        date_end = data['date_end']
        account_type = data['account_type']
        today = fields.Date.today()

        buckets_to_display = {}
        lines_to_display, amount_due = {}, {}
        currency_to_display = {}
        today_display, date_end_display = {}, {}

        lines = self._get_account_display_lines(
            company_id, partner_ids, date_end, account_type)

        for partner_id in partner_ids:
            lines_to_display[partner_id], amount_due[partner_id] = {}, {}
            currency_to_display[partner_id] = {}
            today_display[partner_id] = self._format_date_to_partner_lang(
                today, partner_id)
            date_end_display[partner_id] = self._format_date_to_partner_lang(
                date_end, partner_id)
            for line in lines[partner_id]:
                currency = self.env['res.currency'].browse(line['currency_id'])
                if currency not in lines_to_display[partner_id]:
                    lines_to_display[partner_id][currency] = []
                    currency_to_display[partner_id][currency] = currency
                    amount_due[partner_id][currency] = 0.0
                if not line['blocked']:
                    amount_due[partner_id][currency] += line['open_amount']
                line['balance'] = amount_due[partner_id][currency]
                line['date'] = self._format_date_to_partner_lang(
                    line['date'], partner_id)
                line['date_maturity'] = self._format_date_to_partner_lang(
                    line['date_maturity'], partner_id)
                lines_to_display[partner_id][currency].append(line)

        if data['show_aging_buckets']:
            buckets = self._get_account_show_buckets(
                company_id, partner_ids, date_end, account_type)
            for partner_id in partner_ids:
                buckets_to_display[partner_id] = {}
                for line in buckets[partner_id]:
                    currency = self.env['res.currency'].browse(
                        line['currency_id'])
                    if currency not in buckets_to_display[partner_id]:
                        buckets_to_display[partner_id][currency] = []
                    buckets_to_display[partner_id][currency] = line

        return {
            'doc_ids': partner_ids,
            'doc_model': 'res.partner',
            'docs': self.env['res.partner'].browse(partner_ids),
            'Amount_Due': amount_due,
            'Lines': lines_to_display,
            'Buckets': buckets_to_display,
            'Currencies': currency_to_display,
            'Show_Buckets': data['show_aging_buckets'],
            'Filter_non_due_partners': data['filter_non_due_partners'],
            'Date_end': date_end_display,
            'Date': today_display,
            'account_type': account_type,
        }