#
#    Copyright (C) 2008-2013  Corporation of Balclutha. All rights Reserved.
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#    This program is free software; you can redistribute it and/or modify
#    it under the terms of the GNU General Public License as published by
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from Acquisition import aq_parent, aq_inner, aq_base
from Products.CMFCore.ActionInformation import ActionInformation
from Products.CMFCore.ActionProviderBase import ActionProviderBase
from Products.CMFCore.utils import UniqueObject
from Products.CMFCore.permissions import View

from AccessControl.class_init import InitializeClass

from OFS.PropertyManager import PropertyManager
from OFS.SimpleItem import SimpleItem

from zope.interface import implements

from Products.BastionBanking.ZCurrency import ZCurrency

from Permissions import OperateBastionLedgers
from interfaces.tools import IBLControllerTool

def manage_addDepreciationTool(self, id='depreciation_tool', REQUEST=None):
    """
    """
    self._setObject(id, DepreciationTool())
    if REQUEST:
        REQUEST.RESPONSE.redirect('%s/%s/manage_main' % (REQUEST['URL3'], id))
        
class DepreciationTool(UniqueObject, PropertyManager, SimpleItem, ActionProviderBase):
    """
    Jurisdictionalised depreciation methods and their supporting calculators
    """
    implements(IBLControllerTool)

    id = 'depreciation_tool'
    meta_type = 'DepreciationTool'

    portal_type = 'BLTool'

    icon = 'misc_/BastionLedger/blquill'
    
    __ac_permissions__ = PropertyManager.__ac_permissions__ + (
        (View, ('depreciation_methods',)),
	(OperateBastionLedgers, ('depreciationFunction', 'prime_costMethod',
                                 'diminishing_rateMethod')),
        ) + SimpleItem.__ac_permissions__ + ActionProviderBase.__ac_permissions__

    _actions = ()


    manage_options = ActionProviderBase.manage_options + \
                     PropertyManager.manage_options + \
                     SimpleItem.manage_options

    def __init__(self): pass

    def Description(self):
	return self.__doc__

    def depreciation_methods(self):
        """
        hmmm - these need to be backed up as jurisdiction-related policies calculable from the
        BLAsset data ...
        """
        return ['Diminishing Value', 'Prime Cost',]

    def depreciationFunction(self, method):
        """
        return the depreciation function for this method type
        """
        if method in ('Diminishing Value',):
            return self.diminishing_rateMethod
        elif method in ('Prime Cost',):
            return self.prime_costMethod
        raise NotImplementedError, method

    def prime_costMethod(self, asset, date_range):
        """
        prime cost depreciation - straight line
        """
        return self.diminishing_rateMethod(asset, date_range, multiplier=1.0)


    def diminishing_rateMethod(self, asset, date_range, multiplier=1.0):
        """
        calculate diminishing rate depreciation based upon effective date
        """
        prorated_days = asset.depreciationDays(date_range)

        if prorated_days == 0:
            return ZCurrency('%s 0.00' % asset.purchase_price.currency())

        return asset.totalCost() * prorated_days / 365.0 * multiplier / asset.effective_life

InitializeClass(DepreciationTool)


