# This file is part of Tryton.  The COPYRIGHT file at the top level of
# this repository contains the full copyright notices and license terms.
from trytond.model import ModelView, ModelSQL, Workflow, fields
from trytond.pyson import Eval
from trytond.transaction import Transaction
from trytond.pool import Pool
from trytond.const import OPERATORS

__all__ = ['Period']

_STATES = {
    'readonly': Eval('state') != 'open',
}
_DEPENDS = ['state']


class Period(Workflow, ModelSQL, ModelView):
    'Period'
    __name__ = 'account.period'
    name = fields.Char('Name', required=True)
    start_date = fields.Date('Starting Date', required=True, states=_STATES,
        domain=[('start_date', '<=', Eval('end_date', None))],
        depends=_DEPENDS + ['end_date'], select=True)
    end_date = fields.Date('Ending Date', required=True, states=_STATES,
        domain=[('end_date', '>=', Eval('start_date', None))],
        depends=_DEPENDS + ['start_date'], select=True)
    fiscalyear = fields.Many2One('account.fiscalyear', 'Fiscal Year',
        required=True, states=_STATES, depends=_DEPENDS, select=True)
    state = fields.Selection([
            ('open', 'Open'),
            ('close', 'Close'),
            ('locked', 'Locked'),
            ], 'State', readonly=True, required=True)
    post_move_sequence = fields.Many2One('ir.sequence', 'Post Move Sequence',
        domain=[
            ('code', '=', 'account.move'),
            ['OR',
                ('company', '=', None),
                ('company', '=', Eval('company', -1)),
                ],
            ],
        depends=['company'])
    type = fields.Selection([
            ('standard', 'Standard'),
            ('adjustment', 'Adjustment'),
            ], 'Type', required=True,
        states=_STATES, depends=_DEPENDS, select=True)
    company = fields.Function(fields.Many2One('company.company', 'Company',),
        'on_change_with_company', searcher='search_company')
    icon = fields.Function(fields.Char("Icon"), 'get_icon')

    @classmethod
    def __setup__(cls):
        super(Period, cls).__setup__()
        cls._order.insert(0, ('start_date', 'ASC'))
        cls._error_messages.update({
                'no_period_date': 'No period defined for date "%s".',
                'modify_del_period_moves': ('You can not modify/delete '
                    'period "%s" because it has moves.'),
                'create_period_closed_fiscalyear': ('You can not create '
                    'a period on fiscal year "%s" because it is closed.'),
                'open_period_closed_fiscalyear': ('You can not open period '
                    '"%(period)s" because its fiscal year "%(fiscalyear)s" is '
                    'closed.'),
                'change_post_move_sequence': ('You can not change the post '
                    'move sequence of period "%s" because there are already '
                    'posted moves in the period.'),
                'close_period_non_posted_move': ('You can not close period '
                    '"%(period)s" because there are non posted moves '
                    '"%(move)s" in this period.'),
                'periods_overlap': ('"%(first)s" and "%(second)s" periods '
                    'overlap.'),
                'check_move_sequence': ('Period "%(first)s" and "%(second)s" '
                    'have the same sequence.'),
                'fiscalyear_dates': ('Dates of period "%s" are outside '
                    'are outside it\'s fiscal year dates.'),
                })
        cls._transitions |= set((
                ('open', 'close'),
                ('close', 'locked'),
                ('close', 'open'),
                ))
        cls._buttons.update({
                'close': {
                    'invisible': Eval('state') != 'open',
                    'depends': ['state'],
                    },
                'reopen': {
                    'invisible': Eval('state') != 'close',
                    'depends': ['state'],
                    },
                'lock': {
                    'invisible': Eval('state') != 'close',
                    'depends': ['state'],
                    },
                })

    @staticmethod
    def default_state():
        return 'open'

    @staticmethod
    def default_type():
        return 'standard'

    @fields.depends('fiscalyear')
    def on_change_with_company(self, name=None):
        if self.fiscalyear:
            return self.fiscalyear.company.id

    @classmethod
    def search_company(cls, name, clause):
        return [('fiscalyear.' + clause[0],) + tuple(clause[1:])]

    def get_icon(self, name):
        return {
            'open': 'tryton-open',
            'close': 'tryton-close',
            'locked': 'tryton-readonly',
            }.get(self.state)

    @classmethod
    def validate(cls, periods):
        super(Period, cls).validate(periods)
        for period in periods:
            period.check_dates()
            period.check_fiscalyear_dates()
            period.check_post_move_sequence()

    def check_dates(self):
        if self.type != 'standard':
            return True
        transaction = Transaction()
        connection = transaction.connection
        transaction.database.lock(connection, self._table)
        table = self.__table__()
        cursor = connection.cursor()
        cursor.execute(*table.select(table.id,
                where=(((table.start_date <= self.start_date)
                        & (table.end_date >= self.start_date))
                    | ((table.start_date <= self.end_date)
                        & (table.end_date >= self.end_date))
                    | ((table.start_date >= self.start_date)
                        & (table.end_date <= self.end_date)))
                & (table.fiscalyear == self.fiscalyear.id)
                & (table.type == 'standard')
                & (table.id != self.id)))
        period_id = cursor.fetchone()
        if period_id:
            overlapping_period = self.__class__(period_id[0])
            self.raise_user_error('periods_overlap', {
                    'first': self.rec_name,
                    'second': overlapping_period.rec_name,
                    })

    def check_fiscalyear_dates(self):
        if (self.start_date < self.fiscalyear.start_date
                or self.end_date > self.fiscalyear.end_date):
            self.raise_user_error('fiscalyear_dates', (self.rec_name,))

    def check_post_move_sequence(self):
        if not self.post_move_sequence:
            return
        periods = self.search([
                ('post_move_sequence', '=', self.post_move_sequence.id),
                ('fiscalyear', '!=', self.fiscalyear.id),
                ])
        if periods:
            self.raise_user_error('check_move_sequence', {
                    'first': self.rec_name,
                    'second': periods[0].rec_name,
                    })

    @classmethod
    def find(cls, company_id, date=None, exception=True, test_state=True):
        '''
        Return the period for the company_id
            at the date or the current date.
        If exception is set the function will raise an exception
            if no period is found.
        If test_state is true, it will search on non-closed periods
        '''
        pool = Pool()
        Date = pool.get('ir.date')
        Lang = pool.get('ir.lang')

        if not date:
            date = Date.today()
        clause = [
            ('start_date', '<=', date),
            ('end_date', '>=', date),
            ('fiscalyear.company', '=', company_id),
            ('type', '=', 'standard'),
            ]
        if test_state:
            clause.append(('state', '=', 'open'))
        periods = cls.search(clause, order=[('start_date', 'DESC')], limit=1)
        if not periods:
            if exception:
                lang = Lang.get()
                cls.raise_user_error('no_period_date', lang.strftime(date))
            else:
                return None
        return periods[0].id

    @classmethod
    def _check(cls, periods):
        Move = Pool().get('account.move')
        moves = Move.search([
                ('period', 'in', [p.id for p in periods]),
                ], limit=1)
        if moves:
            cls.raise_user_error('modify_del_period_moves', (
                    moves[0].period.rec_name,))

    @classmethod
    def search(cls, args, offset=0, limit=None, order=None, count=False,
            query=False):
        args = args[:]

        def process_args(args):
            i = 0
            while i < len(args):
                # add test for xmlrpc and pyson that doesn't handle tuple
                if ((isinstance(args[i], tuple)
                            or (isinstance(args[i], list) and len(args[i]) > 2
                                and args[i][1] in OPERATORS))
                        and args[i][0] in ('start_date', 'end_date')
                        and isinstance(args[i][2], (list, tuple))):
                    if not args[i][2][0]:
                        args[i] = ('id', '!=', '0')
                    else:
                        period = cls(args[i][2][0])
                        args[i] = (args[i][0], args[i][1],
                            getattr(period, args[i][2][1]))
                elif isinstance(args[i], list):
                    process_args(args[i])
                i += 1
        process_args(args)
        return super(Period, cls).search(args, offset=offset, limit=limit,
            order=order, count=count, query=query)

    @classmethod
    def create(cls, vlist):
        FiscalYear = Pool().get('account.fiscalyear')
        vlist = [x.copy() for x in vlist]
        for vals in vlist:
            if vals.get('fiscalyear'):
                fiscalyear = FiscalYear(vals['fiscalyear'])
                if fiscalyear.state != 'open':
                    cls.raise_user_error('create_period_closed_fiscalyear',
                        (fiscalyear.rec_name,))
                if not vals.get('post_move_sequence'):
                    vals['post_move_sequence'] = (
                        fiscalyear.post_move_sequence.id)
        return super(Period, cls).create(vlist)

    @classmethod
    def write(cls, *args):
        Move = Pool().get('account.move')
        actions = iter(args)
        args = []
        for periods, values in zip(actions, actions):
            for key, value in values.items():
                if key in ('start_date', 'end_date', 'fiscalyear'):
                    def modified(period):
                        if key in ['start_date', 'end_date']:
                            return getattr(period, key) != value
                        else:
                            return period.fiscalyear .id != value
                    cls._check(list(filter(modified, periods)))
                    break
            if values.get('state') == 'open':
                for period in periods:
                    if period.fiscalyear.state != 'open':
                        cls.raise_user_error('open_period_closed_fiscalyear', {
                                'period': period.rec_name,
                                'fiscalyear': period.fiscalyear.rec_name,
                                })
            if values.get('post_move_sequence'):
                for period in periods:
                    if (period.post_move_sequence
                            and period.post_move_sequence.id !=
                            values['post_move_sequence']):
                        if Move.search([
                                    ('period', '=', period.id),
                                    ('state', '=', 'posted'),
                                    ]):
                            cls.raise_user_error('change_post_move_sequence',
                                (period.rec_name,))
            args.extend((periods, values))
        super(Period, cls).write(*args)

    @classmethod
    def delete(cls, periods):
        cls._check(periods)
        super(Period, cls).delete(periods)

    @classmethod
    @ModelView.button
    @Workflow.transition('close')
    def close(cls, periods):
        pool = Pool()
        JournalPeriod = pool.get('account.journal.period')
        Move = pool.get('account.move')
        transaction = Transaction()
        database = transaction.database
        connection = transaction.connection

        # Lock period to be sure no new period will be created in between.
        database.lock(connection, JournalPeriod._table)

        unposted_moves = Move.search([
                ('period', 'in', [p.id for p in periods]),
                ('state', '!=', 'posted'),
                ], limit=1)
        if unposted_moves:
            unposted_move, = unposted_moves
            cls.raise_user_error('close_period_non_posted_move', {
                    'period': unposted_move.period.rec_name,
                    'move': unposted_move.rec_name,
                    })
        journal_periods = JournalPeriod.search([
            ('period', 'in', [p.id for p in periods]),
            ])
        JournalPeriod.close(journal_periods)

    @classmethod
    @ModelView.button
    @Workflow.transition('open')
    def reopen(cls, periods):
        "Re-open period"
        pass

    @classmethod
    @ModelView.button
    @Workflow.transition('locked')
    def lock(cls, periods):
        pass

    @property
    def post_move_sequence_used(self):
        return self.post_move_sequence or self.fiscalyear.post_move_sequence
