pms/hotel/models/currency_exchange.py

# -*- coding: utf-8 -*-
# Copyright 2018  Alexandre Díaz
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).
from decimal import Decimal
# For Python 3.0 and later
from urllib.request import urlopen
from openerp import models, fields, api, _


class CurrencyExchangeRate(models.Model):

    _name = "currency.exchange"
    _description = "currency"

    name = fields.Char('Reg Number', readonly=True, default='New')
    today_date = fields.Datetime('Date Ordered',
                                 required=True,
                                 default=(lambda *a:
                                          time.strftime
                                          (DEFAULT_SERVER_DATETIME_FORMAT)))
    input_curr = fields.Many2one('res.currency', string='Input Currency',
                                 track_visibility='always')
    in_amount = fields.Float('Amount Taken', size=64, default=1.0)
    out_curr = fields.Many2one('res.currency', string='Output Currency',
                               track_visibility='always')
    out_amount = fields.Float('Subtotal', size=64)
    folio_no = fields.Many2one('hotel.folio', 'Folio Number')
    guest_name = fields.Many2one('res.partner', string='Guest Name')
    room_number = fields.Char(string='Room Number')
    state = fields.Selection([('draft', 'Draft'), ('done', 'Done'),
                              ('cancel', 'Cancel')], 'State', default='draft')
    rate = fields.Float('Rate(per unit)', size=64)
    hotel_id = fields.Many2one('stock.warehouse', 'Hotel Name')
    type = fields.Selection([('cash', 'Cash')], 'Type', default='cash')
    tax = fields.Selection([('2', '2%'), ('5', '5%'), ('10', '10%')],
                           'Service Tax', default='2')
    total = fields.Float('Amount Given')

    @api.model
    def create(self, vals):
        """
        Overrides orm create method.
        @param self: The object pointer
        @param vals: dictionary of fields value.
        """
        if not vals:
            vals = {}
        if self._context is None:
            self._context = {}
        seq_obj = self.env['ir.sequence']
        vals['name'] = seq_obj.next_by_code('currency.exchange') or 'New'
        return super(CurrencyExchangeRate, self).create(vals)

    @api.onchange('folio_no')
    def get_folio_no(self):
        '''
        When you change folio_no, based on that it will update
        the guest_name,hotel_id and room_number as well
        ---------------------------------------------------------
        @param self: object pointer
        '''
        for rec in self:
            self.guest_name = False
            self.hotel_id = False
            self.room_number = False
            if rec.folio_no and len(rec.folio_no.room_lines) != 0:
                self.guest_name = rec.folio_no.partner_id.id
                self.hotel_id = rec.folio_no.warehouse_id.id
                self.room_number = rec.folio_no.room_lines[0].product_id.name

    @api.multi
    def act_cur_done(self):
        """
        This method is used to change the state
        to done of the currency exchange
        ---------------------------------------
        @param self: object pointer
        """
        self.write({'state': 'done'})
        return True

    @api.multi
    def act_cur_cancel(self):
        """
        This method is used to change the state
        to cancel of the currency exchange
        ---------------------------------------
        @param self: object pointer
        """
        self.write({'state': 'cancel'})
        return True

    @api.multi
    def act_cur_cancel_draft(self):
        """
        This method is used to change the state
        to draft of the currency exchange
        ---------------------------------------
        @param self: object pointer
        """
        self.write({'state': 'draft'})
        return True

    @api.model
    def get_rate(self, a, b):
        '''
        Calculate rate between two currency
        -----------------------------------
        @param self: object pointer
        '''
        try:
            url = 'http://finance.yahoo.com/d/quotes.csv?s=%s%s=X&f=l1' % (a,
                                                                           b)
            rate = urllib2.urlopen(url).read().rstrip()
            return Decimal(rate)
        except:
            return Decimal('-1.00')

    @api.onchange('input_curr', 'out_curr', 'in_amount')
    def get_currency(self):
        '''
        When you change input_curr, out_curr or in_amount
        it will update the out_amount of the currency exchange
        ------------------------------------------------------
        @param self: object pointer
        '''
        self.out_amount = 0.0
        if self.input_curr:
            for rec in self:
                result = rec.get_rate(self.input_curr.name,
                                      self.out_curr.name)
                if self.out_curr:
                    self.rate = result
                    if self.rate == Decimal('-1.00'):
                        raise except_orm(_('Warning'),
                                         _('Please Check Your \
                                         Network Connectivity.'))
                    self.out_amount = (float(result) * float(self.in_amount))

    @api.onchange('out_amount', 'tax')
    def tax_change(self):
        '''
        When you change out_amount or tax
        it will update the total of the currency exchange
        -------------------------------------------------
        @param self: object pointer
        '''
        if self.out_amount:
            ser_tax = ((self.out_amount) * (float(self.tax))) / 100
            self.total = self.out_amount - ser_tax