# 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, Workflow, ModelSQL, fields
from trytond.pyson import Eval
from trytond.pool import Pool
from trytond.i18n import gettext
from trytond.model.exceptions import AccessError
from trytond.transaction import Transaction
from .exceptions import (StaffContractError)
from trytond import backend
from trytond.tools.multivalue import migrate_property


STATES = {'readonly': (Eval('state') != 'draft')}

PAYMENT_TERM = [
    ('', ''),
    ('1', 'Cash')
]


class StaffContract(Workflow, ModelSQL, ModelView):
    "Staff Contract"
    __name__ = "staff.contract"
    _rec_name = 'number'
    number = fields.Char('Number', select=True, states=STATES)
    employee = fields.Many2One('company.employee', 'Employee',
                               select=True, required=True, states=STATES)
    company = fields.Many2One('company.company', 'Company', required=True,
                              select=True, states=STATES)
    contract_date = fields.Date('Contract Date', required=True,
                                states=STATES)
    start_date = fields.Date('Start Contract', required=True, states=STATES)
    end_date = fields.Date('End Contract', states={
            'required': Eval('state') == 'finished',
            'readonly': Eval('state') == 'finished',
        }, depends=['state'])
    canceled_date = fields.Date('Canceled Date', states={
            'required': Eval('state') == 'canceled',
        }, depends=['state'])
    salary = fields.Numeric('Salary', digits=(16, 2), states=STATES,
                            help='Salary monthly of person', required=True)
    kind = fields.Selection([
            ('steady', 'Steady'),
            ('indefinite', 'Indefinite'),
            ('job', 'Job'),
            ('learning', 'learning'),
            ('internships', 'internships')
            ], 'Kind', select=True, states=STATES)
    kind_string = kind.translated('kind')
    state = fields.Selection([
            ('draft', 'Draft'),
            ('active', 'Active'),
            ('finished', 'Finished'),
            ('canceled', 'Canceled'),
        ], 'State', readonly=True, select=True)
    payment_term = fields.Selection(
        PAYMENT_TERM, 'Payment Term', states=STATES)
    comment = fields.Text("Comment", states=STATES)
    position = fields.Many2One('staff.position', 'Position',
                               select=True)

    @classmethod
    def __setup__(cls):
        super(StaffContract, cls).__setup__()
        cls._order.insert(0, ('number', 'DESC'))
        cls._transitions |= set((
            ('draft', 'active'),
            ('active', 'draft'),
            ('active', 'canceled'),
            ('active', 'finished'),
        ))
        cls._buttons.update({
            'draft': {
                'invisible': Eval('state') != 'active',
            },
            'active': {
                'invisible': Eval('state') != 'draft',
            },
            'finished': {
                'invisible': Eval('state') != 'active',
            },
            'canceled': {
                'invisible': Eval('state') != 'active',
            },
        })

    @classmethod
    def __register__(cls, module_name):
        exist = backend.TableHandler.table_exist(cls._table)

        super(StaffContract, cls).__register__(module_name)
        if not exist:
            cls._migrate_property([], [], [])

    @classmethod
    def _migrate_property(cls, field_names, value_names, fields):
        field_names.append('payment_term')
        migrate_property(
            'staff.contract', field_names, cls, value_names,
            fields=fields)

    @staticmethod
    def default_company():
        return Transaction().context.get('company')

    @staticmethod
    def default_state():
        return 'draft'

    @staticmethod
    def default_kind():
        return 'job'

    @staticmethod
    def default_payment_term():
        return '1'

    @classmethod
    def search_rec_name(cls, name, clause):
        if clause[1].startswith('!') or clause[1].startswith('not '):
            bool_op = 'AND'
        else:
            bool_op = 'OR'
        return [bool_op,
                ('number',) + tuple(clause[1:]),
                ('employee',) + tuple(clause[1:]),
                ]

    @classmethod
    @ModelView.button
    @Workflow.transition('draft')
    def draft(cls, records):
        pass

    @classmethod
    @ModelView.button
    @Workflow.transition('active')
    def active(cls, records):
        for contract in records:
            contract.set_number()

    @classmethod
    @ModelView.button
    @Workflow.transition('finished')
    def finished(cls, records):
        for contract in records:
            contract._check_finish_date()

    @classmethod
    @ModelView.button
    @Workflow.transition('canceled')
    def canceled(cls, records):
        for contract in records:
            if not contract.canceled_date:
                raise StaffContractError(gettext('staff.msg_missing_canceled_date'))

    def _check_finish_date(self):
        pass

    def set_number(self):
        '''
        Fill the reference field with the request sequence
        '''
        pool = Pool()
        Config = pool.get('staff.configuration')
        config = Config(1)

        if self.number:
            return
        if not config.staff_contract_sequence:
            raise StaffContractError(gettext('staff.msg_missing_contract_sequence'))
        number = config.staff_contract_sequence.get()
        self.write([self], {'number': number})

    @classmethod
    def create(cls, vlist):
        vlist = [v.copy() for v in vlist]
        for values in vlist:
            contracts_current = cls.search([
                ('employee', '=', values['employee']),
                ('state', 'in', ('active', 'draft')),
            ])
            if contracts_current:
                raise AccessError(gettext('staff.msg_employee_with_contract_current',
                                          contract=contracts_current[0].employee.rec_name))
        return super(StaffContract, cls).create(vlist)

    @classmethod
    def delete(cls, records):
        for contract in records:
            if contract.number:
                raise AccessError(gettext('staff.msg_dont_delete_contract',
                                          contract=contracts_current[0].employee.rec_name))
        return super(StaffContract, cls).delete(records)