# -*- coding: utf-8 -*-
# This file is part of the cashbook-module from m-ds for 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.pool import Pool
from trytond.pyson import Eval, If
from trytond.transaction import Transaction

sel_linetype = [
    ('edit', 'Edit'),
    ('check', 'Checked'),
    ('done', 'Done'),
    ]


STATES = {
    'readonly': Eval('state', '') != 'edit',
    }
DEPENDS=['state']


class LineContext(ModelView):
    'Line Context'
    __name__ = 'cashbook.line.context'

    account = fields.Many2One(string='Account', required=True,
        model_name='cashbook.book',
        states={
            'readonly': Eval('num_account', 0) < 2,
        }, depends=['num_account'])
    date_from = fields.Date(string='Start Date', depends=['date_to'],
        domain=[
            If(Eval('date_to') & Eval('date_from'),
                ('date_from', '<=', Eval('date_to')),
                ()),
            ])
    date_to = fields.Date(string='End Date', depends=['date_from'],
        domain=[
            If(Eval('date_to') & Eval('date_from'),
                ('date_from', '<=', Eval('date_to')),
                ()),
            ])
    checked = fields.Boolean(string='Checked',
        help='Show account lines in Checked-state.')
    done = fields.Boolean(string='Done',
        help='Show account lines in Done-state.')
    num_account = fields.Function(fields.Integer(string='Number of Accounts',
        readonly=True, states={'invisible': True}),
        'on_change_with_num_account')

    @classmethod
    def default_account(cls):
        """ get default from context
        """
        context = Transaction().context
        return context.get('account', None)

    @classmethod
    def default_date_from(cls):
        """ get default from context
        """
        context = Transaction().context
        return context.get('date_from', None)

    @classmethod
    def default_date_to(cls):
        """ get default from context
        """
        context = Transaction().context
        return context.get('date_to', None)

    @classmethod
    def default_checked(cls):
        """ get default from context
        """
        context = Transaction().context
        return context.get('checked', False)

    @classmethod
    def default_done(cls):
        """ get default from context
        """
        context = Transaction().context
        return context.get('done', False)

    def on_change_with_num_account(self, name=None):
        """ get number of accessible accounts,
            depends on user-permissions
        """
        CashBook = Pool().get('cashbook.book')
        return CashBook.search_count([])

# end LineContext


class Line(Workflow, ModelSQL, ModelView):
    'Account Line'
    __name__ = 'cashbook.line'

    account = fields.Many2One(string='Account', required=True, select=True,
        model_name='cashbook.book', ondelete='CASCADE', readonly=True)
    date = fields.Date(string='Date', required=True, select=True,
        states=STATES, depends=DEPENDS)
    description = fields.Char(string='Description',
        states=STATES, depends=DEPENDS)
    state = fields.Selection(string='State', required=True, readonly=True,
        select=True, selection=sel_linetype)

    @classmethod
    def __setup__(cls):
        super(Line, cls).__setup__()
        cls._order.insert(0, ('date', 'ASC'))
        cls._transitions |= set((
                ('edit', 'check'),
                ('check', 'done'),
                ('check', 'edit'),
            ))
        cls._buttons.update({
            'wfedit': {
                'invisible': Eval('state', '') != 'check',
                'depends': ['state'],
                },
            'wfcheck': {
                'invisible': Eval('state') != 'edit',
                'depends': ['state'],
                },
            'wfdone': {
                'invisible': Eval('state') != 'check',
                'depends': ['state'],
                },
            })

    @classmethod
    @ModelView.button
    @Workflow.transition('edit')
    def wfedit(cls, lines):
        """ edit line
        """
        pass

    @classmethod
    @ModelView.button
    @Workflow.transition('check')
    def wfcheck(cls, lines):
        """ line is checked
        """
        pass

    @classmethod
    @ModelView.button
    @Workflow.transition('done')
    def wfdone(cls, lines):
        """ line is done
        """
        pass

    @classmethod
    def default_state(cls):
        """ default: edit
        """
        return 'edit'

    @classmethod
    def default_date(cls):
        """ default: today
        """
        IrDate = Pool().get('ir.date')
        return IrDate.today()

    @classmethod
    def default_account(cls):
        """ get default from context
        """
        context = Transaction().context
        return context.get('account', None)

# end Line