# This file is part of account_reports for tryton.  The COPYRIGHT file
# at the top level of this repository contains the full copyright notices and
# license terms.
from decimal import Decimal
from sql.aggregate import Sum
from sql.conditionals import Coalesce
from sql.operators import In

from trytond.pool import Pool, PoolMeta
from trytond.tools import reduce_ids
from trytond.transaction import Transaction

__all__ = ['FiscalYear', 'Account', 'Party']


class FiscalYear(metaclass=PoolMeta):
    __name__ = 'account.fiscalyear'

    def get_periods(self, start_period, end_period):
        pool = Pool()
        Period = pool.get('account.period')
        domain = [('fiscalyear', '=', self)]
        if start_period:
            domain += [('start_date', '>=', start_period.start_date)]
            domain += [('end_date', '>=', start_period.end_date)]
        if end_period:
            domain += [('start_date', '<=', end_period.start_date)]
            domain += [('end_date', '<=', end_period.end_date)]

        periods = Period.search(domain)
        return periods


class AccountTemplate(metaclass=PoolMeta):
    __name__ = 'account.account.template'

    @classmethod
    def __setup__(cls):
        super(AccountTemplate, cls).__setup__()
        # hide because used in odt report
        cls.general_ledger_balance.states['invisible'] = True


class Account(metaclass=PoolMeta):
    __name__ = 'account.account'

    @classmethod
    def __setup__(cls):
        super(Account, cls).__setup__()
        # hide because used in odt report
        cls.general_ledger_balance.states['invisible'] = True

    @classmethod
    def read_account_vals(cls, accounts, with_moves=False,
            exclude_party_moves=False):
        pool = Pool()
        Account = pool.get('account.account')
        Move = pool.get('account.move')
        MoveLine = pool.get('account.move.line')
        line = MoveLine.__table__()
        move = Move.__table__()
        table_a = Account.__table__()
        table_c = Account.__table__()

        in_max = 3000
        values = {}
        transaction = Transaction()
        cursor = transaction.connection.cursor()
        move_join = 'INNER' if with_moves else 'LEFT'
        if not accounts:
            accounts = Account.search([
                    ('company', '=', transaction.context.get('company')),
                    ])
        account_ids = [a.id for a in accounts]
        group_by = (table_a.id,)
        columns = (group_by + (Sum(Coalesce(line.debit, 0)).as_('debit'),
                Sum(Coalesce(line.credit, 0)).as_('credit'),
                (Sum(Coalesce(line.debit, 0)) -
                    Sum(Coalesce(line.credit, 0))).as_('balance')))
        for i in range(0, len(account_ids), in_max):
            sub_ids = account_ids[i:i + in_max]
            red_sql = reduce_ids(table_a.id, sub_ids)
            where = red_sql
            periods = transaction.context.get('periods', False)
            if periods:
                periods.append(0)
                where = (where & In(Coalesce(move.period, 0), periods))
            date = transaction.context.get('date')
            if date:
                where &= (move.date <= date)
            if exclude_party_moves:
                # This "where" not use account kind (before a change use it)
                # because there are some companies that the accounts kind and
                # party_required use in a different way that "standard".
                # For example if you check the prty_required an account with
                # the kind equal to 'other'
                where = (where & (line.party == None))

            cursor.execute(*table_a.join(table_c,
                    condition=(table_c.left >= table_a.left)
                    & (table_c.right <= table_a.right)
                    ).join(line, move_join,
                        condition=line.account == table_c.id
                    ).join(move, move_join,
                        condition=move.id == line.move
                    ).select(*columns, where=where, group_by=group_by))

            for account, debit, credit, balance in cursor.fetchall():
                # SQLite uses float for SUM
                if not isinstance(credit, Decimal):
                    credit = Decimal(str(credit))
                if not isinstance(debit, Decimal):
                    debit = Decimal(str(debit))
                if not isinstance(balance, Decimal):
                    balance = Decimal(str(balance))
                values[account] = {
                    'credit': credit,
                    'debit': debit,
                    'balance': balance,
                    }
        return values


class Party(metaclass=PoolMeta):
    __name__ = 'party.party'

    @classmethod
    def get_account_values_by_party(cls, parties, accounts, company):
        '''
        Function to compute credit,debit and balance for party ids.
        '''
        res = {}
        pool = Pool()
        Move = pool.get('account.move')
        MoveLine = pool.get('account.move.line')
        Account = pool.get('account.account')
        transaction = Transaction()
        context = transaction.context
        cursor = transaction.connection.cursor()

        move = Move.__table__()
        line = MoveLine.__table__()
        account = Account.__table__()

        group_by = (line.party, line.account,)
        columns = (group_by + (Sum(Coalesce(line.debit, 0)).as_('debit'),
                Sum(Coalesce(line.credit, 0)).as_('credit'),
                (Sum(Coalesce(line.debit, 0)) -
                    Sum(Coalesce(line.credit, 0))).as_('balance')))
        line_query, _ = MoveLine.query_get(line)
        if context.get('date'):
            # Cumulate data from previous fiscalyears
            line_query = line.move.in_(move.select(move.id,
                        where=move.date <= context.get('date')))
        where = (line_query &
            (account.company == company.id))
        if accounts:
            where = where & line.account.in_([a.id for a in accounts])
        if parties:
            where = where & line.party.in_([p.id for p in parties])
        cursor.execute(*line.join(account,
                condition=(line.account == account.id)
                ).select(*columns, where=where, group_by=group_by))

        for party, account, debit, credit, balance in cursor.fetchall():
            # SQLite uses float for SUM
            if not isinstance(credit, Decimal):
                credit = Decimal(str(credit))
            if not isinstance(debit, Decimal):
                debit = Decimal(str(debit))
            if not isinstance(balance, Decimal):
                balance = Decimal(str(balance))

            if account not in res:
                res[account] = {}
            res[account][party] = {
                'credit': credit,
                'debit': debit,
                'balance': balance,
                }
        return res