# This file is part of Tryton.  The COPYRIGHT file at the top level of
# this repository contains the full copyright notices and license terms.
import datetime

from sql import Literal
from sql.conditionals import Coalesce

from trytond.model import Model, fields
from trytond.pool import Pool
from trytond.pyson import Bool, Eval, If
from trytond.transaction import Transaction


class PeriodMixin(Model):

    start_date = fields.Date(
        "Start Date",
        domain=[
            If(Eval('start_date') & Eval('end_date'),
                ('start_date', '<=', Eval('end_date')),
                ()),
            ])
    end_date = fields.Date(
        "End Date",
        domain=[
            If(Eval('start_date') & Eval('end_date'),
                ('end_date', '>=', Eval('start_date')),
                ()),
            ])

    @classmethod
    def __setup__(cls):
        super().__setup__()
        if (hasattr(cls, 'parent')
                and hasattr(cls, 'childs')
                and hasattr(cls, 'company')):
            cls.parent.domain = [
                ('company', '=', Eval('company', 0)),
                ['OR',
                    If(Bool(Eval('start_date')),
                        ('start_date', '>=', Eval('start_date', None)),
                        ()),
                    ('start_date', '=', None),
                    ],
                ['OR',
                    If(Bool(Eval('end_date')),
                        ('end_date', '<=', Eval('end_date', None)),
                        ()),
                    ('end_date', '=', None),
                    ],
                ]
            cls.parent.depends.update({'company', 'start_date', 'end_date'})

            cls.childs.domain = [
                ('company', '=', Eval('company', 0)),
                If(Bool(Eval('start_date')),
                    ('start_date', '>=', Eval('start_date', None)),
                    ()),
                If(Bool(Eval('end_date')),
                    ('end_date', '<=', Eval('end_date', None)),
                    ()),
                ]
            cls.childs.depends.update({'company', 'start_date', 'end_date'})


class ActivePeriodMixin(PeriodMixin):

    active = fields.Function(fields.Boolean("Active"), 'on_change_with_active')

    @classmethod
    def _active_dates(cls):
        pool = Pool()
        Date = pool.get('ir.date')
        FiscalYear = pool.get('account.fiscalyear')
        Period = pool.get('account.period')
        context = Transaction().context
        today = Date.today()

        date = context.get('date')
        from_date, to_date = context.get('from_date'), context.get('to_date')
        period_ids = context.get('periods')
        fiscalyear_id = context.get('fiscalyear')
        if date:
            fiscalyears = FiscalYear.search([
                    ('start_date', '<=', date),
                    ('end_date', '>=', date),
                    ])
        elif from_date or to_date:
            domain = []
            if from_date:
                domain.append(('end_date', '>=', from_date))
            if to_date:
                domain.append(('start_date', '<=', to_date))
            fiscalyears = FiscalYear.search(domain)
        elif period_ids:
            periods = Period.browse(period_ids)
            fiscalyears = list(set(p.fiscalyear for p in periods))
        elif fiscalyear_id:
            fiscalyears = FiscalYear.browse([fiscalyear_id])
        else:
            fiscalyears = FiscalYear.search([
                    ('start_date', '<=', today),
                    ('end_date', '>=', today),
                    ], limit=1)
        if not fiscalyears:
            return (from_date or date or today, to_date or date or today)
        return (
            min(f.start_date for f in fiscalyears),
            max(f.end_date for f in fiscalyears))

    @classmethod
    def default_active(cls):
        return True

    @fields.depends('start_date', 'end_date')
    def on_change_with_active(self, name=None):
        from_date, to_date = self._active_dates()
        start_date = self.start_date or datetime.date.min
        end_date = self.end_date or datetime.date.max
        return (start_date <= to_date <= end_date
            or start_date <= from_date <= end_date
            or (from_date <= start_date and end_date <= to_date))

    @classmethod
    def domain_active(cls, domain, tables):
        table, _ = tables[None]
        _, operator, value = domain

        from_date, to_date = cls._active_dates()
        start_date = Coalesce(table.start_date, datetime.date.min)
        end_date = Coalesce(table.end_date, datetime.date.max)

        expression = (((start_date <= to_date) & (end_date >= to_date))
            | ((start_date <= from_date) & (end_date >= from_date))
            | ((start_date >= from_date) & (end_date <= to_date)))

        if operator in {'=', '!='}:
            if (operator == '=') != value:
                expression = ~expression
        elif operator in {'in', 'not in'}:
            if True in value and False not in value:
                pass
            elif False in value and True not in value:
                expression = ~expression
            else:
                expression = Literal(True)
        else:
            expression = Literal(True)
        return expression


class ContextCompanyMixin(Model):

    context_company = fields.Function(fields.Boolean("Context Company"),
        'get_context_company')

    def get_context_company(self, name):
        context = Transaction().context
        return self.company.id == context.get('company')

    @classmethod
    def domain_context_company(cls, domain, tables):
        context = Transaction().context
        table, _ = tables[None]
        _, operator, value = domain

        expression = table.company == context.get('company')
        if operator in {'=', '!='}:
            if (operator == '=') != value:
                expression = ~expression
        elif operator in {'in', 'not in'}:
            if True in value and False not in value:
                pass
            elif False in value and True not in value:
                expression = ~expression
            else:
                expression = Literal(True)
        else:
            expression = Literal(True)
        return expression