#-*- coding:utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2009 Tiny SPRL (<http://tiny.be>). All Rights Reserved
#    d$
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Affero General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Affero General Public License for more details.
#
#    You should have received a copy of the GNU Affero General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
##############################################################################

import time
from datetime import date
from datetime import datetime
from datetime import timedelta
from dateutil import relativedelta

from openerp.osv import fields, osv
from openerp import tools
from openerp.tools.translate import _
import openerp.addons.decimal_precision as dp

from openerp.tools.safe_eval import safe_eval as eval

class hr_payroll_structure(osv.osv):
    """
    Salary structure used to defined
    - Basic
    - Allowances
    - Deductions
    """

    _name = 'hr.payroll.structure'
    _description = 'Salary Structure'
    _columns = {
        'name':fields.char('Name', size=256, required=True),
        'code':fields.char('Reference', size=64, required=True),
        'company_id':fields.many2one('res.company', 'Company', required=True),
        'note': fields.text('Description'),
        'parent_id':fields.many2one('hr.payroll.structure', 'Parent'),
        'children_ids':fields.one2many('hr.payroll.structure', 'parent_id', 'Children'),
        'rule_ids':fields.many2many('hr.salary.rule', 'hr_structure_salary_rule_rel', 'struct_id', 'rule_id', 'Salary Rules'),
    }

    def _get_parent(self, cr, uid, context=None):
        obj_model = self.pool.get('ir.model.data')
        res = False
        data_id = obj_model.search(cr, uid, [('model', '=', 'hr.payroll.structure'), ('name', '=', 'structure_base')])
        if data_id:
            res = obj_model.browse(cr, uid, data_id[0], context=context).res_id
        return res

    _defaults = {
        'company_id': lambda self, cr, uid, context: \
                self.pool.get('res.users').browse(cr, uid, uid,
                    context=context).company_id.id,
        'parent_id': _get_parent,
    }

    _constraints = [
        (osv.osv._check_recursion, 'Error ! You cannot create a recursive Salary Structure.', ['parent_id']) 
    ]
        
    def copy(self, cr, uid, id, default=None, context=None):
        """
        Create a new record in hr_payroll_structure model from existing one
        @param cr: cursor to database
        @param user: id of current user
        @param id: list of record ids on which copy method executes
        @param default: dict type contains the values to be override during copy of object
        @param context: context arguments, like lang, time zone

        @return: returns a id of newly created record
        """
        if not default:
            default = {}
        default.update(
            code=_("%s (copy)") % (self.browse(cr, uid, id, context=context).code),
            company_id=self.pool.get('res.users').browse(cr, uid, uid, context=context).company_id.id)
        return super(hr_payroll_structure, self).copy(cr, uid, id, default, context=context)

    def get_all_rules(self, cr, uid, structure_ids, context=None):
        """
        @param structure_ids: list of structure
        @return: returns a list of tuple (id, sequence) of rules that are maybe to apply
        """

        all_rules = []
        for struct in self.browse(cr, uid, structure_ids, context=context):
            all_rules += self.pool.get('hr.salary.rule')._recursive_search_of_rules(cr, uid, struct.rule_ids, context=context)
        return all_rules

    def _get_parent_structure(self, cr, uid, struct_ids, context=None):
        if not struct_ids:
            return []
        parent = []
        for struct in self.browse(cr, uid, struct_ids, context=context):
            if struct.parent_id:
                parent.append(struct.parent_id.id)
        if parent:
            parent = self._get_parent_structure(cr, uid, parent, context)
        return parent + struct_ids


class hr_contract(osv.osv):
    """
    Employee contract based on the visa, work permits
    allows to configure different Salary structure
    """

    _inherit = 'hr.contract'
    _description = 'Employee Contract'
    _columns = {
        'struct_id': fields.many2one('hr.payroll.structure', 'Salary Structure'),
        'schedule_pay': fields.selection([
            ('monthly', 'Monthly'),
            ('quarterly', 'Quarterly'),
            ('semi-annually', 'Semi-annually'),
            ('annually', 'Annually'),
            ('weekly', 'Weekly'),
            ('bi-weekly', 'Bi-weekly'),
            ('bi-monthly', 'Bi-monthly'),
            ], 'Scheduled Pay', select=True),
    }

    _defaults = {
        'schedule_pay': 'monthly',
    }

    def get_all_structures(self, cr, uid, contract_ids, context=None):
        """
        @param contract_ids: list of contracts
        @return: the structures linked to the given contracts, ordered by hierachy (parent=False first, then first level children and so on) and without duplicata
        """
        structure_ids = [contract.struct_id.id for contract in self.browse(cr, uid, contract_ids, context=context) if contract.struct_id]
        if not structure_ids:
            return []
        return list(set(self.pool.get('hr.payroll.structure')._get_parent_structure(cr, uid, structure_ids, context=context)))


class contrib_register(osv.osv):
    '''
    Contribution Register
    '''

    _name = 'hr.contribution.register'
    _description = 'Contribution Register'

    _columns = {
        'company_id':fields.many2one('res.company', 'Company'),
        'partner_id':fields.many2one('res.partner', 'Partner'),
        'name':fields.char('Name', size=256, required=True, readonly=False),
        'register_line_ids':fields.one2many('hr.payslip.line', 'register_id', 'Register Line', readonly=True),
        'note': fields.text('Description'),
    }
    _defaults = {
        'company_id': lambda self, cr, uid, context: \
                self.pool.get('res.users').browse(cr, uid, uid,
                    context=context).company_id.id,
    }


class hr_salary_rule_category(osv.osv):
    """
    HR Salary Rule Category
    """

    _name = 'hr.salary.rule.category'
    _description = 'Salary Rule Category'
    _columns = {
        'name':fields.char('Name', size=64, required=True, readonly=False),
        'code':fields.char('Code', size=64, required=True, readonly=False),
        'parent_id':fields.many2one('hr.salary.rule.category', 'Parent', help="Linking a salary category to its parent is used only for the reporting purpose."),
        'children_ids': fields.one2many('hr.salary.rule.category', 'parent_id', 'Children'),
        'note': fields.text('Description'),
        'company_id':fields.many2one('res.company', 'Company', required=False),
    }

    _defaults = {
        'company_id': lambda self, cr, uid, context: \
                self.pool.get('res.users').browse(cr, uid, uid,
                    context=context).company_id.id,
    }


class one2many_mod2(fields.one2many):

    def get(self, cr, obj, ids, name, user=None, offset=0, context=None, values=None):
        if context is None:
            context = {}
        if not values:
            values = {}
        res = {}
        for id in ids:
            res[id] = []
        ids2 = obj.pool[self._obj].search(cr, user, [(self._fields_id,'in',ids), ('appears_on_payslip', '=', True)], limit=self._limit)
        for r in obj.pool[self._obj]._read_flat(cr, user, ids2, [self._fields_id], context=context, load='_classic_write'):
            res[r[self._fields_id]].append( r['id'] )
        return res

class hr_payslip_run(osv.osv):

    _name = 'hr.payslip.run'
    _description = 'Payslip Batches'
    _columns = {
        'name': fields.char('Name', size=64, required=True, readonly=True, states={'draft': [('readonly', False)]}),
        'slip_ids': fields.one2many('hr.payslip', 'payslip_run_id', 'Payslips', required=False, readonly=True, states={'draft': [('readonly', False)]}),
        'state': fields.selection([
            ('draft', 'Draft'),
            ('close', 'Close'),
        ], 'Status', select=True, readonly=True),
        'date_start': fields.date('Date From', required=True, readonly=True, states={'draft': [('readonly', False)]}),
        'date_end': fields.date('Date To', required=True, readonly=True, states={'draft': [('readonly', False)]}),
        'credit_note': fields.boolean('Credit Note', readonly=True, states={'draft': [('readonly', False)]}, help="If its checked, indicates that all payslips generated from here are refund payslips."),
    }
    _defaults = {
        'state': 'draft',
        'date_start': lambda *a: time.strftime('%Y-%m-01'),
        'date_end': lambda *a: str(datetime.now() + relativedelta.relativedelta(months=+1, day=1, days=-1))[:10],
    }

    def draft_payslip_run(self, cr, uid, ids, context=None):
        return self.write(cr, uid, ids, {'state': 'draft'}, context=context)

    def close_payslip_run(self, cr, uid, ids, context=None):
        return self.write(cr, uid, ids, {'state': 'close'}, context=context)


class hr_payslip(osv.osv):
    '''
    Pay Slip
    '''

    _name = 'hr.payslip'
    _description = 'Pay Slip'

    def _get_lines_salary_rule_category(self, cr, uid, ids, field_names, arg=None, context=None):
        result = {}
        if not ids: return result
        for id in ids:
            result.setdefault(id, [])
        cr.execute('''SELECT pl.slip_id, pl.id FROM hr_payslip_line AS pl \
                    LEFT JOIN hr_salary_rule_category AS sh on (pl.category_id = sh.id) \
                    WHERE pl.slip_id in %s \
                    GROUP BY pl.slip_id, pl.sequence, pl.id ORDER BY pl.sequence''',(tuple(ids),))
        res = cr.fetchall()
        for r in res:
            result[r[0]].append(r[1])
        return result
    
    def _count_detail_payslip(self, cr, uid, ids, field_name, arg, context=None):
        res = {}
        for details in self.browse(cr, uid, ids, context=context):
            res[details.id] = len(details.line_ids)
        return res

    _columns = {
        'struct_id': fields.many2one('hr.payroll.structure', 'Structure', readonly=True, states={'draft': [('readonly', False)]}, help='Defines the rules that have to be applied to this payslip, accordingly to the contract chosen. If you let empty the field contract, this field isn\'t mandatory anymore and thus the rules applied will be all the rules set on the structure of all contracts of the employee valid for the chosen period'),
        'name': fields.char('Payslip Name', size=64, required=False, readonly=True, states={'draft': [('readonly', False)]}),
        'number': fields.char('Reference', size=64, required=False, readonly=True, states={'draft': [('readonly', False)]}),
        'employee_id': fields.many2one('hr.employee', 'Employee', required=True, readonly=True, states={'draft': [('readonly', False)]}),
        'date_from': fields.date('Date From', readonly=True, states={'draft': [('readonly', False)]}, required=True),
        'date_to': fields.date('Date To', readonly=True, states={'draft': [('readonly', False)]}, required=True),
        'state': fields.selection([
            ('draft', 'Draft'),
            ('verify', 'Waiting'),
            ('done', 'Done'),
            ('cancel', 'Rejected'),
        ], 'Status', select=True, readonly=True,
            help='* When the payslip is created the status is \'Draft\'.\
            \n* If the payslip is under verification, the status is \'Waiting\'. \
            \n* If the payslip is confirmed then status is set to \'Done\'.\
            \n* When user cancel payslip the status is \'Rejected\'.'),
        'line_ids': one2many_mod2('hr.payslip.line', 'slip_id', 'Payslip Lines', readonly=True, states={'draft':[('readonly',False)]}),
        'company_id': fields.many2one('res.company', 'Company', required=False, readonly=True, states={'draft': [('readonly', False)]}),
        'worked_days_line_ids': fields.one2many('hr.payslip.worked_days', 'payslip_id', 'Payslip Worked Days', required=False, readonly=True, states={'draft': [('readonly', False)]}),
        'input_line_ids': fields.one2many('hr.payslip.input', 'payslip_id', 'Payslip Inputs', required=False, readonly=True, states={'draft': [('readonly', False)]}),
        'paid': fields.boolean('Made Payment Order ? ', required=False, readonly=True, states={'draft': [('readonly', False)]}),
        'note': fields.text('Internal Note', readonly=True, states={'draft':[('readonly',False)]}),
        'contract_id': fields.many2one('hr.contract', 'Contract', required=False, readonly=True, states={'draft': [('readonly', False)]}),
        'details_by_salary_rule_category': fields.function(_get_lines_salary_rule_category, method=True, type='one2many', relation='hr.payslip.line', string='Details by Salary Rule Category'),
        'credit_note': fields.boolean('Credit Note', help="Indicates this payslip has a refund of another", readonly=True, states={'draft': [('readonly', False)]}),
        'payslip_run_id': fields.many2one('hr.payslip.run', 'Payslip Batches', readonly=True, states={'draft': [('readonly', False)]}),
        'payslip_count': fields.function(_count_detail_payslip, type='integer', string="Payslip Computation Details"),
    }
    _defaults = {
        'date_from': lambda *a: time.strftime('%Y-%m-01'),
        'date_to': lambda *a: str(datetime.now() + relativedelta.relativedelta(months=+1, day=1, days=-1))[:10],
        'state': 'draft',
        'credit_note': False,
        'company_id': lambda self, cr, uid, context: \
                self.pool.get('res.users').browse(cr, uid, uid,
                    context=context).company_id.id,
    }

    def _check_dates(self, cr, uid, ids, context=None):
        for payslip in self.browse(cr, uid, ids, context=context):
            if payslip.date_from > payslip.date_to:
                return False
        return True

    _constraints = [(_check_dates, "Payslip 'Date From' must be before 'Date To'.", ['date_from', 'date_to'])]

    def copy(self, cr, uid, id, default=None, context=None):
        if not default:
            default = {}
        company_id = self.pool.get('res.users').browse(cr, uid, uid, context=context).company_id.id
        default.update({
            'line_ids': [],
            'company_id': company_id,
            'number': '',
            'payslip_run_id': False,
            'paid': False,
        })
        return super(hr_payslip, self).copy(cr, uid, id, default, context=context)

    def cancel_sheet(self, cr, uid, ids, context=None):
        return self.write(cr, uid, ids, {'state': 'cancel'}, context=context)

    def process_sheet(self, cr, uid, ids, context=None):
        return self.write(cr, uid, ids, {'paid': True, 'state': 'done'}, context=context)

    def hr_verify_sheet(self, cr, uid, ids, context=None):
        self.compute_sheet(cr, uid, ids, context)
        return self.write(cr, uid, ids, {'state': 'verify'}, context=context)

    def refund_sheet(self, cr, uid, ids, context=None):
        mod_obj = self.pool.get('ir.model.data')
        for payslip in self.browse(cr, uid, ids, context=context):
            id_copy = self.copy(cr, uid, payslip.id, {'credit_note': True, 'name': _('Refund: ')+payslip.name}, context=context)
            self.compute_sheet(cr, uid, [id_copy], context=context)
            self.signal_hr_verify_sheet(cr, uid, [id_copy])
            self.signal_process_sheet(cr, uid, [id_copy])
            
        form_id = mod_obj.get_object_reference(cr, uid, 'hr_payroll', 'view_hr_payslip_form')
        form_res = form_id and form_id[1] or False
        tree_id = mod_obj.get_object_reference(cr, uid, 'hr_payroll', 'view_hr_payslip_tree')
        tree_res = tree_id and tree_id[1] or False
        return {
            'name':_("Refund Payslip"),
            'view_mode': 'tree, form',
            'view_id': False,
            'view_type': 'form',
            'res_model': 'hr.payslip',
            'type': 'ir.actions.act_window',
            'nodestroy': True,
            'target': 'current',
            'domain': "[('id', 'in', %s)]" % [id_copy],
            'views': [(tree_res, 'tree'), (form_res, 'form')],
            'context': {}
        }

    def check_done(self, cr, uid, ids, context=None):
        return True

    def unlink(self, cr, uid, ids, context=None):
        for payslip in self.browse(cr, uid, ids, context=context):
            if payslip.state not in  ['draft','cancel']:
                raise osv.except_osv(_('Warning!'),_('You cannot delete a payslip which is not draft or cancelled!'))
        return super(hr_payslip, self).unlink(cr, uid, ids, context)

    #TODO move this function into hr_contract module, on hr.employee object
    def get_contract(self, cr, uid, employee, date_from, date_to, context=None):
        """
        @param employee: browse record of employee
        @param date_from: date field
        @param date_to: date field
        @return: returns the ids of all the contracts for the given employee that need to be considered for the given dates
        """
        contract_obj = self.pool.get('hr.contract')
        clause = []
        #a contract is valid if it ends between the given dates
        clause_1 = ['&',('date_end', '<=', date_to),('date_end','>=', date_from)]
        #OR if it starts between the given dates
        clause_2 = ['&',('date_start', '<=', date_to),('date_start','>=', date_from)]
        #OR if it starts before the date_from and finish after the date_end (or never finish)
        clause_3 = [('date_start','<=', date_from),'|',('date_end', '=', False),('date_end','>=', date_to)]
        clause_final =  [('employee_id', '=', employee.id),'|','|'] + clause_1 + clause_2 + clause_3
        contract_ids = contract_obj.search(cr, uid, clause_final, context=context)
        return contract_ids

    def compute_sheet(self, cr, uid, ids, context=None):
        slip_line_pool = self.pool.get('hr.payslip.line')
        sequence_obj = self.pool.get('ir.sequence')
        for payslip in self.browse(cr, uid, ids, context=context):
            number = payslip.number or sequence_obj.get(cr, uid, 'salary.slip')
            #delete old payslip lines
            old_slipline_ids = slip_line_pool.search(cr, uid, [('slip_id', '=', payslip.id)], context=context)
#            old_slipline_ids
            if old_slipline_ids:
                slip_line_pool.unlink(cr, uid, old_slipline_ids, context=context)
            if payslip.contract_id:
                #set the list of contract for which the rules have to be applied
                contract_ids = [payslip.contract_id.id]
            else:
                #if we don't give the contract, then the rules to apply should be for all current contracts of the employee
                contract_ids = self.get_contract(cr, uid, payslip.employee_id, payslip.date_from, payslip.date_to, context=context)
            lines = [(0,0,line) for line in self.pool.get('hr.payslip').get_payslip_lines(cr, uid, contract_ids, payslip.id, context=context)]
            self.write(cr, uid, [payslip.id], {'line_ids': lines, 'number': number,}, context=context)
        return True

    def get_worked_day_lines(self, cr, uid, contract_ids, date_from, date_to, context=None):
        """
        @param contract_ids: list of contract id
        @return: returns a list of dict containing the input that should be applied for the given contract between date_from and date_to
        """
        def was_on_leave(employee_id, datetime_day, context=None):
            res = False
            day = datetime_day.strftime("%Y-%m-%d")
            holiday_ids = self.pool.get('hr.holidays').search(cr, uid, [('state','=','validate'),('employee_id','=',employee_id),('type','=','remove'),('date_from','<=',day),('date_to','>=',day)])
            if holiday_ids:
                res = self.pool.get('hr.holidays').browse(cr, uid, holiday_ids, context=context)[0].holiday_status_id.name
            return res

        res = []
        for contract in self.pool.get('hr.contract').browse(cr, uid, contract_ids, context=context):
            if not contract.working_hours:
                #fill only if the contract as a working schedule linked
                continue
            attendances = {
                 'name': _("Normal Working Days paid at 100%"),
                 'sequence': 1,
                 'code': 'WORK100',
                 'number_of_days': 0.0,
                 'number_of_hours': 0.0,
                 'contract_id': contract.id,
            }
            leaves = {}
            day_from = datetime.strptime(date_from,"%Y-%m-%d")
            day_to = datetime.strptime(date_to,"%Y-%m-%d")
            nb_of_days = (day_to - day_from).days + 1
            for day in range(0, nb_of_days):
                working_hours_on_day = self.pool.get('resource.calendar').working_hours_on_day(cr, uid, contract.working_hours, day_from + timedelta(days=day), context)
                if working_hours_on_day:
                    #the employee had to work
                    leave_type = was_on_leave(contract.employee_id.id, day_from + timedelta(days=day), context=context)
                    if leave_type:
                        #if he was on leave, fill the leaves dict
                        if leave_type in leaves:
                            leaves[leave_type]['number_of_days'] += 1.0
                            leaves[leave_type]['number_of_hours'] += working_hours_on_day
                        else:
                            leaves[leave_type] = {
                                'name': leave_type,
                                'sequence': 5,
                                'code': leave_type,
                                'number_of_days': 1.0,
                                'number_of_hours': working_hours_on_day,
                                'contract_id': contract.id,
                            }
                    else:
                        #add the input vals to tmp (increment if existing)
                        attendances['number_of_days'] += 1.0
                        attendances['number_of_hours'] += working_hours_on_day
            leaves = [value for key,value in leaves.items()]
            res += [attendances] + leaves
        return res

    def get_inputs(self, cr, uid, contract_ids, date_from, date_to, context=None):
        res = []
        contract_obj = self.pool.get('hr.contract')
        rule_obj = self.pool.get('hr.salary.rule')

        structure_ids = contract_obj.get_all_structures(cr, uid, contract_ids, context=context)
        rule_ids = self.pool.get('hr.payroll.structure').get_all_rules(cr, uid, structure_ids, context=context)
        sorted_rule_ids = [id for id, sequence in sorted(rule_ids, key=lambda x:x[1])]

        for contract in contract_obj.browse(cr, uid, contract_ids, context=context):
            for rule in rule_obj.browse(cr, uid, sorted_rule_ids, context=context):
                if rule.input_ids:
                    for input in rule.input_ids:
                        inputs = {
                             'name': input.name,
                             'code': input.code,
                             'contract_id': contract.id,
                        }
                        res += [inputs]
        return res

    def get_payslip_lines(self, cr, uid, contract_ids, payslip_id, context):
        def _sum_salary_rule_category(localdict, category, amount):
            if category.parent_id:
                localdict = _sum_salary_rule_category(localdict, category.parent_id, amount)
            localdict['categories'].dict[category.code] = category.code in localdict['categories'].dict and localdict['categories'].dict[category.code] + amount or amount
            return localdict

        class BrowsableObject(object):
            def __init__(self, pool, cr, uid, employee_id, dict):
                self.pool = pool
                self.cr = cr
                self.uid = uid
                self.employee_id = employee_id
                self.dict = dict

            def __getattr__(self, attr):
                return attr in self.dict and self.dict.__getitem__(attr) or 0.0

        class InputLine(BrowsableObject):
            """a class that will be used into the python code, mainly for usability purposes"""
            def sum(self, code, from_date, to_date=None):
                if to_date is None:
                    to_date = datetime.now().strftime('%Y-%m-%d')
                result = 0.0
                self.cr.execute("SELECT sum(amount) as sum\
                            FROM hr_payslip as hp, hr_payslip_input as pi \
                            WHERE hp.employee_id = %s AND hp.state = 'done' \
                            AND hp.date_from >= %s AND hp.date_to <= %s AND hp.id = pi.payslip_id AND pi.code = %s",
                           (self.employee_id, from_date, to_date, code))
                res = self.cr.fetchone()[0]
                return res or 0.0

        class WorkedDays(BrowsableObject):
            """a class that will be used into the python code, mainly for usability purposes"""
            def _sum(self, code, from_date, to_date=None):
                if to_date is None:
                    to_date = datetime.now().strftime('%Y-%m-%d')
                result = 0.0
                self.cr.execute("SELECT sum(number_of_days) as number_of_days, sum(number_of_hours) as number_of_hours\
                            FROM hr_payslip as hp, hr_payslip_worked_days as pi \
                            WHERE hp.employee_id = %s AND hp.state = 'done'\
                            AND hp.date_from >= %s AND hp.date_to <= %s AND hp.id = pi.payslip_id AND pi.code = %s",
                           (self.employee_id, from_date, to_date, code))
                return self.cr.fetchone()

            def sum(self, code, from_date, to_date=None):
                res = self._sum(code, from_date, to_date)
                return res and res[0] or 0.0

            def sum_hours(self, code, from_date, to_date=None):
                res = self._sum(code, from_date, to_date)
                return res and res[1] or 0.0

        class Payslips(BrowsableObject):
            """a class that will be used into the python code, mainly for usability purposes"""

            def sum(self, code, from_date, to_date=None):
                if to_date is None:
                    to_date = datetime.now().strftime('%Y-%m-%d')
                self.cr.execute("SELECT sum(case when hp.credit_note = False then (pl.total) else (-pl.total) end)\
                            FROM hr_payslip as hp, hr_payslip_line as pl \
                            WHERE hp.employee_id = %s AND hp.state = 'done' \
                            AND hp.date_from >= %s AND hp.date_to <= %s AND hp.id = pl.slip_id AND pl.code = %s",
                            (self.employee_id, from_date, to_date, code))
                res = self.cr.fetchone()
                return res and res[0] or 0.0

        #we keep a dict with the result because a value can be overwritten by another rule with the same code
        result_dict = {}
        rules = {}
        categories_dict = {}
        blacklist = []
        payslip_obj = self.pool.get('hr.payslip')
        inputs_obj = self.pool.get('hr.payslip.worked_days')
        obj_rule = self.pool.get('hr.salary.rule')
        payslip = payslip_obj.browse(cr, uid, payslip_id, context=context)
        worked_days = {}
        for worked_days_line in payslip.worked_days_line_ids:
            worked_days[worked_days_line.code] = worked_days_line
        inputs = {}
        for input_line in payslip.input_line_ids:
            inputs[input_line.code] = input_line

        categories_obj = BrowsableObject(self.pool, cr, uid, payslip.employee_id.id, categories_dict)
        input_obj = InputLine(self.pool, cr, uid, payslip.employee_id.id, inputs)
        worked_days_obj = WorkedDays(self.pool, cr, uid, payslip.employee_id.id, worked_days)
        payslip_obj = Payslips(self.pool, cr, uid, payslip.employee_id.id, payslip)
        rules_obj = BrowsableObject(self.pool, cr, uid, payslip.employee_id.id, rules)

        baselocaldict = {'categories': categories_obj, 'rules': rules_obj, 'payslip': payslip_obj, 'worked_days': worked_days_obj, 'inputs': input_obj}
        #get the ids of the structures on the contracts and their parent id as well
        structure_ids = self.pool.get('hr.contract').get_all_structures(cr, uid, contract_ids, context=context)
        #get the rules of the structure and thier children
        rule_ids = self.pool.get('hr.payroll.structure').get_all_rules(cr, uid, structure_ids, context=context)
        #run the rules by sequence
        sorted_rule_ids = [id for id, sequence in sorted(rule_ids, key=lambda x:x[1])]

        for contract in self.pool.get('hr.contract').browse(cr, uid, contract_ids, context=context):
            employee = contract.employee_id
            localdict = dict(baselocaldict, employee=employee, contract=contract)
            for rule in obj_rule.browse(cr, uid, sorted_rule_ids, context=context):
                key = rule.code + '-' + str(contract.id)
                localdict['result'] = None
                localdict['result_qty'] = 1.0
                localdict['result_rate'] = 100
                #check if the rule can be applied
                if obj_rule.satisfy_condition(cr, uid, rule.id, localdict, context=context) and rule.id not in blacklist:
                    #compute the amount of the rule
                    amount, qty, rate = obj_rule.compute_rule(cr, uid, rule.id, localdict, context=context)
                    #check if there is already a rule computed with that code
                    previous_amount = rule.code in localdict and localdict[rule.code] or 0.0
                    #set/overwrite the amount computed for this rule in the localdict
                    tot_rule = amount * qty * rate / 100.0
                    localdict[rule.code] = tot_rule
                    rules[rule.code] = rule
                    #sum the amount for its salary category
                    localdict = _sum_salary_rule_category(localdict, rule.category_id, tot_rule - previous_amount)
                    #create/overwrite the rule in the temporary results
                    result_dict[key] = {
                        'salary_rule_id': rule.id,
                        'contract_id': contract.id,
                        'name': rule.name,
                        'code': rule.code,
                        'category_id': rule.category_id.id,
                        'sequence': rule.sequence,
                        'appears_on_payslip': rule.appears_on_payslip,
                        'condition_select': rule.condition_select,
                        'condition_python': rule.condition_python,
                        'condition_range': rule.condition_range,
                        'condition_range_min': rule.condition_range_min,
                        'condition_range_max': rule.condition_range_max,
                        'amount_select': rule.amount_select,
                        'amount_fix': rule.amount_fix,
                        'amount_python_compute': rule.amount_python_compute,
                        'amount_percentage': rule.amount_percentage,
                        'amount_percentage_base': rule.amount_percentage_base,
                        'register_id': rule.register_id.id,
                        'amount': amount,
                        'employee_id': contract.employee_id.id,
                        'quantity': qty,
                        'rate': rate,
                    }
                else:
                    #blacklist this rule and its children
                    blacklist += [id for id, seq in self.pool.get('hr.salary.rule')._recursive_search_of_rules(cr, uid, [rule], context=context)]

        result = [value for code, value in result_dict.items()]
        return result

    def onchange_employee_id(self, cr, uid, ids, date_from, date_to, employee_id=False, contract_id=False, context=None):
        empolyee_obj = self.pool.get('hr.employee')
        contract_obj = self.pool.get('hr.contract')
        worked_days_obj = self.pool.get('hr.payslip.worked_days')
        input_obj = self.pool.get('hr.payslip.input')

        if context is None:
            context = {}
        #delete old worked days lines
        old_worked_days_ids = ids and worked_days_obj.search(cr, uid, [('payslip_id', '=', ids[0])], context=context) or False
        if old_worked_days_ids:
            worked_days_obj.unlink(cr, uid, old_worked_days_ids, context=context)

        #delete old input lines
        old_input_ids = ids and input_obj.search(cr, uid, [('payslip_id', '=', ids[0])], context=context) or False
        if old_input_ids:
            input_obj.unlink(cr, uid, old_input_ids, context=context)


        #defaults
        res = {'value':{
                      'line_ids':[],
                      'input_line_ids': [],
                      'worked_days_line_ids': [],
                      #'details_by_salary_head':[], TODO put me back
                      'name':'',
                      'contract_id': False,
                      'struct_id': False,
                      }
            }
        if (not employee_id) or (not date_from) or (not date_to):
            return res
        ttyme = datetime.fromtimestamp(time.mktime(time.strptime(date_from, "%Y-%m-%d")))
        employee_id = empolyee_obj.browse(cr, uid, employee_id, context=context)
        res['value'].update({
                    'name': _('Salary Slip of %s for %s') % (employee_id.name, tools.ustr(ttyme.strftime('%B-%Y'))),
                    'company_id': employee_id.company_id.id
        })

        if not context.get('contract', False):
            #fill with the first contract of the employee
            contract_ids = self.get_contract(cr, uid, employee_id, date_from, date_to, context=context)
        else:
            if contract_id:
                #set the list of contract for which the input have to be filled
                contract_ids = [contract_id]
            else:
                #if we don't give the contract, then the input to fill should be for all current contracts of the employee
                contract_ids = self.get_contract(cr, uid, employee_id, date_from, date_to, context=context)

        if not contract_ids:
            return res
        contract_record = contract_obj.browse(cr, uid, contract_ids[0], context=context)
        res['value'].update({
                    'contract_id': contract_record and contract_record.id or False
        })
        struct_record = contract_record and contract_record.struct_id or False
        if not struct_record:
            return res
        res['value'].update({
                    'struct_id': struct_record.id,
        })
        #computation of the salary input
        worked_days_line_ids = self.get_worked_day_lines(cr, uid, contract_ids, date_from, date_to, context=context)
        input_line_ids = self.get_inputs(cr, uid, contract_ids, date_from, date_to, context=context)
        res['value'].update({
                    'worked_days_line_ids': worked_days_line_ids,
                    'input_line_ids': input_line_ids,
        })
        return res

    def onchange_contract_id(self, cr, uid, ids, date_from, date_to, employee_id=False, contract_id=False, context=None):
#TODO it seems to be the mess in the onchanges, we should have onchange_employee => onchange_contract => doing all the things
        if context is None:
            context = {}
        res = {'value':{
                 'line_ids': [],
                 'name': '',
                 }
              }
        context.update({'contract': True})
        if not contract_id:
            res['value'].update({'struct_id': False})
        return self.onchange_employee_id(cr, uid, ids, date_from=date_from, date_to=date_to, employee_id=employee_id, contract_id=contract_id, context=context)


class hr_payslip_worked_days(osv.osv):
    '''
    Payslip Worked Days
    '''

    _name = 'hr.payslip.worked_days'
    _description = 'Payslip Worked Days'
    _columns = {
        'name': fields.char('Description', size=256, required=True),
        'payslip_id': fields.many2one('hr.payslip', 'Pay Slip', required=True, ondelete='cascade', select=True),
        'sequence': fields.integer('Sequence', required=True, select=True),
        'code': fields.char('Code', size=52, required=True, help="The code that can be used in the salary rules"),
        'number_of_days': fields.float('Number of Days'),
        'number_of_hours': fields.float('Number of Hours'),
        'contract_id': fields.many2one('hr.contract', 'Contract', required=True, help="The contract for which applied this input"),
    }
    _order = 'payslip_id, sequence'
    _defaults = {
        'sequence': 10,
    }

class hr_payslip_input(osv.osv):
    '''
    Payslip Input
    '''

    _name = 'hr.payslip.input'
    _description = 'Payslip Input'
    _columns = {
        'name': fields.char('Description', size=256, required=True),
        'payslip_id': fields.many2one('hr.payslip', 'Pay Slip', required=True, ondelete='cascade', select=True),
        'sequence': fields.integer('Sequence', required=True, select=True),
        'code': fields.char('Code', size=52, required=True, help="The code that can be used in the salary rules"),
        'amount': fields.float('Amount', help="It is used in computation. For e.g. A rule for sales having 1% commission of basic salary for per product can defined in expression like result = inputs.SALEURO.amount * contract.wage*0.01."),
        'contract_id': fields.many2one('hr.contract', 'Contract', required=True, help="The contract for which applied this input"),
    }
    _order = 'payslip_id, sequence'
    _defaults = {
        'sequence': 10,
        'amount': 0.0,
    }


class hr_salary_rule(osv.osv):

    _name = 'hr.salary.rule'
    _columns = {
        'name':fields.char('Name', size=256, required=True, readonly=False),
        'code':fields.char('Code', size=64, required=True, help="The code of salary rules can be used as reference in computation of other rules. In that case, it is case sensitive."),
        'sequence': fields.integer('Sequence', required=True, help='Use to arrange calculation sequence', select=True),
        'quantity': fields.char('Quantity', size=256, help="It is used in computation for percentage and fixed amount.For e.g. A rule for Meal Voucher having fixed amount of 1€ per worked day can have its quantity defined in expression like worked_days.WORK100.number_of_days."),
        'category_id':fields.many2one('hr.salary.rule.category', 'Category', required=True),
        'active':fields.boolean('Active', help="If the active field is set to false, it will allow you to hide the salary rule without removing it."),
        'appears_on_payslip': fields.boolean('Appears on Payslip', help="Used to display the salary rule on payslip."),
        'parent_rule_id':fields.many2one('hr.salary.rule', 'Parent Salary Rule', select=True),
        'company_id':fields.many2one('res.company', 'Company', required=False),
        'condition_select': fields.selection([('none', 'Always True'),('range', 'Range'), ('python', 'Python Expression')], "Condition Based on", required=True),
        'condition_range':fields.char('Range Based on',size=1024, readonly=False, help='This will be used to compute the % fields values; in general it is on basic, but you can also use categories code fields in lowercase as a variable names (hra, ma, lta, etc.) and the variable basic.'),
        'condition_python':fields.text('Python Condition', required=True, readonly=False, help='Applied this rule for calculation if condition is true. You can specify condition like basic > 1000.'),
        'condition_range_min': fields.float('Minimum Range', required=False, help="The minimum amount, applied for this rule."),
        'condition_range_max': fields.float('Maximum Range', required=False, help="The maximum amount, applied for this rule."),
        'amount_select':fields.selection([
            ('percentage','Percentage (%)'),
            ('fix','Fixed Amount'),
            ('code','Python Code'),
        ],'Amount Type', select=True, required=True, help="The computation method for the rule amount."),
        'amount_fix': fields.float('Fixed Amount', digits_compute=dp.get_precision('Payroll'),),
        'amount_percentage': fields.float('Percentage (%)', digits_compute=dp.get_precision('Payroll Rate'), help='For example, enter 50.0 to apply a percentage of 50%'),
        'amount_python_compute':fields.text('Python Code'),
        'amount_percentage_base':fields.char('Percentage based on',size=1024, required=False, readonly=False, help='result will be affected to a variable'),
        'child_ids':fields.one2many('hr.salary.rule', 'parent_rule_id', 'Child Salary Rule'),
        'register_id':fields.many2one('hr.contribution.register', 'Contribution Register', help="Eventual third party involved in the salary payment of the employees."),
        'input_ids': fields.one2many('hr.rule.input', 'input_id', 'Inputs'),
        'note':fields.text('Description'),
     }
    _defaults = {
        'amount_python_compute': '''
# Available variables:
#----------------------
# payslip: object containing the payslips
# employee: hr.employee object
# contract: hr.contract object
# rules: object containing the rules code (previously computed)
# categories: object containing the computed salary rule categories (sum of amount of all rules belonging to that category).
# worked_days: object containing the computed worked days.
# inputs: object containing the computed inputs.

# Note: returned value have to be set in the variable 'result'

result = contract.wage * 0.10''',
        'condition_python':
'''
# Available variables:
#----------------------
# payslip: object containing the payslips
# employee: hr.employee object
# contract: hr.contract object
# rules: object containing the rules code (previously computed)
# categories: object containing the computed salary rule categories (sum of amount of all rules belonging to that category).
# worked_days: object containing the computed worked days
# inputs: object containing the computed inputs

# Note: returned value have to be set in the variable 'result'

result = rules.NET > categories.NET * 0.10''',
        'condition_range': 'contract.wage',
        'sequence': 5,
        'appears_on_payslip': True,
        'active': True,
        'company_id': lambda self, cr, uid, context: \
                self.pool.get('res.users').browse(cr, uid, uid,
                    context=context).company_id.id,
        'condition_select': 'none',
        'amount_select': 'fix',
        'amount_fix': 0.0,
        'amount_percentage': 0.0,
        'quantity': '1.0',
     }

    def _recursive_search_of_rules(self, cr, uid, rule_ids, context=None):
        """
        @param rule_ids: list of browse record
        @return: returns a list of tuple (id, sequence) which are all the children of the passed rule_ids
        """
        children_rules = []
        for rule in rule_ids:
            if rule.child_ids:
                children_rules += self._recursive_search_of_rules(cr, uid, rule.child_ids, context=context)
        return [(r.id, r.sequence) for r in rule_ids] + children_rules

    #TODO should add some checks on the type of result (should be float)
    def compute_rule(self, cr, uid, rule_id, localdict, context=None):
        """
        :param rule_id: id of rule to compute
        :param localdict: dictionary containing the environement in which to compute the rule
        :return: returns a tuple build as the base/amount computed, the quantity and the rate
        :rtype: (float, float, float)
        """
        rule = self.browse(cr, uid, rule_id, context=context)
        if rule.amount_select == 'fix':
            try:
                return rule.amount_fix, eval(rule.quantity, localdict), 100.0
            except:
                raise osv.except_osv(_('Error!'), _('Wrong quantity defined for salary rule %s (%s).')% (rule.name, rule.code))
        elif rule.amount_select == 'percentage':
            try:
                return eval(rule.amount_percentage_base, localdict), eval(rule.quantity, localdict), rule.amount_percentage
            except:
                raise osv.except_osv(_('Error!'), _('Wrong percentage base or quantity defined for salary rule %s (%s).')% (rule.name, rule.code))
        else:
            try:
                eval(rule.amount_python_compute, localdict, mode='exec', nocopy=True)
                return localdict['result'], 'result_qty' in localdict and localdict['result_qty'] or 1.0, 'result_rate' in localdict and localdict['result_rate'] or 100.0
            except:
                raise osv.except_osv(_('Error!'), _('Wrong python code defined for salary rule %s (%s).')% (rule.name, rule.code))

    def satisfy_condition(self, cr, uid, rule_id, localdict, context=None):
        """
        @param rule_id: id of hr.salary.rule to be tested
        @param contract_id: id of hr.contract to be tested
        @return: returns True if the given rule match the condition for the given contract. Return False otherwise.
        """
        rule = self.browse(cr, uid, rule_id, context=context)

        if rule.condition_select == 'none':
            return True
        elif rule.condition_select == 'range':
            try:
                result = eval(rule.condition_range, localdict)
                return rule.condition_range_min <=  result and result <= rule.condition_range_max or False
            except:
                raise osv.except_osv(_('Error!'), _('Wrong range condition defined for salary rule %s (%s).')% (rule.name, rule.code))
        else: #python code
            try:
                eval(rule.condition_python, localdict, mode='exec', nocopy=True)
                return 'result' in localdict and localdict['result'] or False
            except:
                raise osv.except_osv(_('Error!'), _('Wrong python condition defined for salary rule %s (%s).')% (rule.name, rule.code))


class hr_rule_input(osv.osv):
    '''
    Salary Rule Input
    '''

    _name = 'hr.rule.input'
    _description = 'Salary Rule Input'
    _columns = {
        'name': fields.char('Description', size=256, required=True),
        'code': fields.char('Code', size=52, required=True, help="The code that can be used in the salary rules"),
        'input_id': fields.many2one('hr.salary.rule', 'Salary Rule Input', required=True)
    }


class hr_payslip_line(osv.osv):
    '''
    Payslip Line
    '''

    _name = 'hr.payslip.line'
    _inherit = 'hr.salary.rule'
    _description = 'Payslip Line'
    _order = 'contract_id, sequence'

    def _calculate_total(self, cr, uid, ids, name, args, context):
        if not ids: return {}
        res = {}
        for line in self.browse(cr, uid, ids, context=context):
            res[line.id] = float(line.quantity) * line.amount * line.rate / 100
        return res

    _columns = {
        'slip_id':fields.many2one('hr.payslip', 'Pay Slip', required=True, ondelete='cascade'),
        'salary_rule_id':fields.many2one('hr.salary.rule', 'Rule', required=True),
        'employee_id':fields.many2one('hr.employee', 'Employee', required=True),
        'contract_id':fields.many2one('hr.contract', 'Contract', required=True, select=True),
        'rate': fields.float('Rate (%)', digits_compute=dp.get_precision('Payroll Rate')),
        'amount': fields.float('Amount', digits_compute=dp.get_precision('Payroll')),
        'quantity': fields.float('Quantity', digits_compute=dp.get_precision('Payroll')),
        'total': fields.function(_calculate_total, method=True, type='float', string='Total', digits_compute=dp.get_precision('Payroll'),store=True ),
    }

    _defaults = {
        'quantity': 1.0,
        'rate': 100.0,
    }



class hr_employee(osv.osv):
    '''
    Employee
    '''

    _inherit = 'hr.employee'
    _description = 'Employee'

    def _calculate_total_wage(self, cr, uid, ids, name, args, context):
        if not ids: return {}
        res = {}
        current_date = datetime.now().strftime('%Y-%m-%d')
        for employee in self.browse(cr, uid, ids, context=context):
            if not employee.contract_ids:
                res[employee.id] = {'basic': 0.0}
                continue
            cr.execute( 'SELECT SUM(wage) '\
                        'FROM hr_contract '\
                        'WHERE employee_id = %s '\
                        'AND date_start <= %s '\
                        'AND (date_end > %s OR date_end is NULL)',
                         (employee.id, current_date, current_date))
            result = dict(cr.dictfetchone())
            res[employee.id] = {'basic': result['sum']}
        return res

    def _payslip_count(self, cr, uid, ids, field_name, arg, context=None):
        Payslip = self.pool['hr.payslip']
        return {
            employee_id: Payslip.search_count(cr,uid, [('employee_id', '=', employee_id)], context=context)
            for employee_id in ids
        }

    _columns = {
        'slip_ids':fields.one2many('hr.payslip', 'employee_id', 'Payslips', required=False, readonly=True),
        'total_wage': fields.function(_calculate_total_wage, method=True, type='float', string='Total Basic Salary', digits_compute=dp.get_precision('Payroll'), help="Sum of all current contract's wage of employee."),
        'payslip_count': fields.function(_payslip_count, type='integer', string='Payslips'),
    }


# vim:expandtab:smartindent:tabstop=4:softtabstop=4:shiftwidth=4:
