# -*- coding: utf-8 -*-
##############################################################################
#
#    OpenERP, Open Source Management Solution
#    Copyright (C) 2004-2010 Tiny SPRL (<http://tiny.be>).
#
#    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 datetime

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

class account_analytic_account(osv.osv):
    _name = 'account.analytic.account'
    _inherit = ['mail.thread']
    _description = 'Analytic Account'
    _track = {
        'state': {
            'analytic.mt_account_pending': lambda self, cr, uid, obj, ctx=None: obj.state == 'pending',
            'analytic.mt_account_closed': lambda self, cr, uid, obj, ctx=None: obj.state == 'close',
            'analytic.mt_account_opened': lambda self, cr, uid, obj, ctx=None: obj.state == 'open',
        },
    }

    def _compute_level_tree(self, cr, uid, ids, child_ids, res, field_names, context=None):
        currency_obj = self.pool.get('res.currency')
        recres = {}
        def recursive_computation(account):
            result2 = res[account.id].copy()
            for son in account.child_ids:
                result = recursive_computation(son)
                for field in field_names:
                    if (account.currency_id.id != son.currency_id.id) and (field!='quantity'):
                        result[field] = currency_obj.compute(cr, uid, son.currency_id.id, account.currency_id.id, result[field], context=context)
                    result2[field] += result[field]
            return result2
        for account in self.browse(cr, uid, ids, context=context):
            if account.id not in child_ids:
                continue
            recres[account.id] = recursive_computation(account)
        return recres

    def _debit_credit_bal_qtty(self, cr, uid, ids, fields, arg, context=None):
        res = {}
        if context is None:
            context = {}
        child_ids = tuple(self.search(cr, uid, [('parent_id', 'child_of', ids)]))
        for i in child_ids:
            res[i] =  {}
            for n in fields:
                res[i][n] = 0.0

        if not child_ids:
            return res

        where_date = ''
        where_clause_args = [tuple(child_ids)]
        if context.get('from_date', False):
            where_date += " AND l.date >= %s"
            where_clause_args  += [context['from_date']]
        if context.get('to_date', False):
            where_date += " AND l.date <= %s"
            where_clause_args += [context['to_date']]
        cr.execute("""
              SELECT a.id,
                     sum(
                         CASE WHEN l.amount > 0
                         THEN l.amount
                         ELSE 0.0
                         END
                          ) as debit,
                     sum(
                         CASE WHEN l.amount < 0
                         THEN -l.amount
                         ELSE 0.0
                         END
                          ) as credit,
                     COALESCE(SUM(l.amount),0) AS balance,
                     COALESCE(SUM(l.unit_amount),0) AS quantity
              FROM account_analytic_account a
                  LEFT JOIN account_analytic_line l ON (a.id = l.account_id)
              WHERE a.id IN %s
              """ + where_date + """
              GROUP BY a.id""", where_clause_args)
        for row in cr.dictfetchall():
            res[row['id']] = {}
            for field in fields:
                res[row['id']][field] = row[field]
        return self._compute_level_tree(cr, uid, ids, child_ids, res, fields, context)

    def name_get(self, cr, uid, ids, context=None):
        res = []
        if not ids:
            return res
        if isinstance(ids, (int, long)):
            ids = [ids]
        for id in ids:
            elmt = self.browse(cr, uid, id, context=context)
            res.append((id, self._get_one_full_name(elmt)))
        return res

    def _get_full_name(self, cr, uid, ids, name=None, args=None, context=None):
        if context == None:
            context = {}
        res = {}
        for elmt in self.browse(cr, uid, ids, context=context):
            res[elmt.id] = self._get_one_full_name(elmt)
        return res

    def _get_one_full_name(self, elmt, level=6):
        if level<=0:
            return '...'
        if elmt.parent_id and not elmt.type == 'template':
            parent_path = self._get_one_full_name(elmt.parent_id, level-1) + " / "
        else:
            parent_path = ''
        return parent_path + elmt.name

    def _child_compute(self, cr, uid, ids, name, arg, context=None):
        result = {}
        if context is None:
            context = {}

        for account in self.browse(cr, uid, ids, context=context):
            result[account.id] = map(lambda x: x.id, [child for child in account.child_ids if child.state != 'template'])

        return result

    def _get_analytic_account(self, cr, uid, ids, context=None):
        company_obj = self.pool.get('res.company')
        analytic_obj = self.pool.get('account.analytic.account')
        accounts = []
        for company in company_obj.browse(cr, uid, ids, context=context):
            accounts += analytic_obj.search(cr, uid, [('company_id', '=', company.id)])
        return accounts

    def _set_company_currency(self, cr, uid, ids, name, value, arg, context=None):
        if isinstance(ids, (int, long)):
            ids=[ids]
        for account in self.browse(cr, uid, ids, context=context):
            if account.company_id:
                if account.company_id.currency_id.id != value:
                    raise osv.except_osv(_('Error!'), _("If you set a company, the currency selected has to be the same as it's currency. \nYou can remove the company belonging, and thus change the currency, only on analytic account of type 'view'. This can be really useful for consolidation purposes of several companies charts with different currencies, for example."))
        if value:
            cr.execute("""update account_analytic_account set currency_id=%s where id=%s""", (value, account.id))
            self.invalidate_cache(cr, uid, ['currency_id'], [account.id], context=context)

    def _currency(self, cr, uid, ids, field_name, arg, context=None):
        result = {}
        for rec in self.browse(cr, uid, ids, context=context):
            if rec.company_id:
                result[rec.id] = rec.company_id.currency_id.id
            else:
                result[rec.id] = rec.currency_id.id
        return result

    _columns = {
        'name': fields.char('Account/Contract Name', required=True, track_visibility='onchange'),
        'complete_name': fields.function(_get_full_name, type='char', string='Full Name'),
        'code': fields.char('Reference', select=True, track_visibility='onchange', copy=False),
        'type': fields.selection([('view','Analytic View'), ('normal','Analytic Account'),('contract','Contract or Project'),('template','Template of Contract')], 'Type of Account', required=True,
                                 help="If you select the View Type, it means you won\'t allow to create journal entries using that account.\n"\
                                  "The type 'Analytic account' stands for usual accounts that you only want to use in accounting.\n"\
                                  "If you select Contract or Project, it offers you the possibility to manage the validity and the invoicing options for this account.\n"\
                                  "The special type 'Template of Contract' allows you to define a template with default data that you can reuse easily."),
        'template_id': fields.many2one('account.analytic.account', 'Template of Contract'),
        'description': fields.text('Description'),
        'parent_id': fields.many2one('account.analytic.account', 'Parent Analytic Account', select=2),
        'child_ids': fields.one2many('account.analytic.account', 'parent_id', 'Child Accounts'),
        'child_complete_ids': fields.function(_child_compute, relation='account.analytic.account', string="Account Hierarchy", type='many2many'),
        'line_ids': fields.one2many('account.analytic.line', 'account_id', 'Analytic Entries'),
        'balance': fields.function(_debit_credit_bal_qtty, type='float', string='Balance', multi='debit_credit_bal_qtty', digits_compute=dp.get_precision('Account')),
        'debit': fields.function(_debit_credit_bal_qtty, type='float', string='Debit', multi='debit_credit_bal_qtty', digits_compute=dp.get_precision('Account')),
        'credit': fields.function(_debit_credit_bal_qtty, type='float', string='Credit', multi='debit_credit_bal_qtty', digits_compute=dp.get_precision('Account')),
        'quantity': fields.function(_debit_credit_bal_qtty, type='float', string='Quantity', multi='debit_credit_bal_qtty'),
        'quantity_max': fields.float('Prepaid Service Units', help='Sets the higher limit of time to work on the contract, based on the timesheet. (for instance, number of hours in a limited support contract.)'),
        'partner_id': fields.many2one('res.partner', 'Customer'),
        'user_id': fields.many2one('res.users', 'Project Manager', track_visibility='onchange'),
        'manager_id': fields.many2one('res.users', 'Account Manager', track_visibility='onchange'),
        'date_start': fields.date('Start Date'),
        'date': fields.date('Expiration Date', select=True, track_visibility='onchange'),
        'company_id': fields.many2one('res.company', 'Company', required=False), #not required because we want to allow different companies to use the same chart of account, except for leaf accounts.
        'state': fields.selection([('template', 'Template'),
                                   ('draft','New'),
                                   ('open','In Progress'),
                                   ('pending','To Renew'),
                                   ('close','Closed'),
                                   ('cancelled', 'Cancelled')],
                                  'Status', required=True,
                                  track_visibility='onchange', copy=False),
        'currency_id': fields.function(_currency, fnct_inv=_set_company_currency, #the currency_id field is readonly except if it's a view account and if there is no company
            store = {
                'res.company': (_get_analytic_account, ['currency_id'], 10),
            }, string='Currency', type='many2one', relation='res.currency'),
    }

    def on_change_template(self, cr, uid, ids, template_id, date_start=False, context=None):
        if not template_id:
            return {}
        res = {'value':{}}
        template = self.browse(cr, uid, template_id, context=context)
        if template.date_start and template.date:
            from_dt = datetime.strptime(template.date_start, tools.DEFAULT_SERVER_DATE_FORMAT)
            to_dt = datetime.strptime(template.date, tools.DEFAULT_SERVER_DATE_FORMAT)
            timedelta = to_dt - from_dt
            res['value']['date'] = datetime.strftime(datetime.now() + timedelta, tools.DEFAULT_SERVER_DATE_FORMAT)
        if not date_start:
            res['value']['date_start'] = fields.date.today()
        res['value']['quantity_max'] = template.quantity_max
        res['value']['parent_id'] = template.parent_id and template.parent_id.id or False
        res['value']['description'] = template.description
        return res

    def on_change_partner_id(self, cr, uid, ids,partner_id, name, context=None):
        res={}
        if partner_id:
            partner = self.pool.get('res.partner').browse(cr, uid, partner_id, context=context)
            if partner.user_id:
                res['manager_id'] = partner.user_id.id
            if not name:
                res['name'] = _('Contract: ') + partner.name
        return {'value': res}

    def _default_company(self, cr, uid, context=None):
        user = self.pool.get('res.users').browse(cr, uid, uid, context=context)
        if user.company_id:
            return user.company_id.id
        return self.pool.get('res.company').search(cr, uid, [('parent_id', '=', False)])[0]

    def _get_default_currency(self, cr, uid, context=None):
        user = self.pool.get('res.users').browse(cr, uid, uid, context=context)
        return user.company_id.currency_id.id

    _defaults = {
        'type': 'normal',
        'company_id': _default_company,
        'code' : lambda obj, cr, uid, context: obj.pool.get('ir.sequence').get(cr, uid, 'account.analytic.account'),
        'state': 'open',
        'user_id': lambda self, cr, uid, ctx: uid,
        'partner_id': lambda self, cr, uid, ctx: ctx.get('partner_id', False),
        'manager_id': lambda self, cr, uid, ctx: ctx.get('manager_id', False),
        'date_start': lambda *a: time.strftime('%Y-%m-%d'),
        'currency_id': _get_default_currency,
    }

    def check_recursion(self, cr, uid, ids, context=None, parent=None):
        return super(account_analytic_account, self)._check_recursion(cr, uid, ids, context=context, parent=parent)

    _order = 'code, name asc'
    _constraints = [
        (check_recursion, 'Error! You cannot create recursive analytic accounts.', ['parent_id']),
    ]

    def name_create(self, cr, uid, name, context=None):
        raise osv.except_osv(_('Warning'), _("Quick account creation disallowed."))

    def copy(self, cr, uid, id, default=None, context=None):
        if not default:
            default = {}
        analytic = self.browse(cr, uid, id, context=context)
        default['name'] = _("%s (copy)") % analytic['name']
        return super(account_analytic_account, self).copy(cr, uid, id, default, context=context)

    def on_change_company(self, cr, uid, id, company_id):
        if not company_id:
            return {}
        currency = self.pool.get('res.company').read(cr, uid, [company_id], ['currency_id'])[0]['currency_id']
        return {'value': {'currency_id': currency}}

    def on_change_parent(self, cr, uid, id, parent_id):
        if not parent_id:
            return {}
        parent = self.read(cr, uid, [parent_id], ['partner_id','code'])[0]
        if parent['partner_id']:
            partner = parent['partner_id'][0]
        else:
            partner = False
        res = {'value': {}}
        if partner:
            res['value']['partner_id'] = partner
        return res

    def name_search(self, cr, uid, name, args=None, operator='ilike', context=None, limit=100):
        if not args:
            args=[]
        if context is None:
            context={}
        if name:
            account_ids = self.search(cr, uid, [('code', '=', name)] + args, limit=limit, context=context)
            if not account_ids:
                dom = []
                for name2 in name.split('/'):
                    name = name2.strip()
                    account_ids = self.search(cr, uid, dom + [('name', operator, name)] + args, limit=limit, context=context)
                    if not account_ids: break
                    dom = [('parent_id','in',account_ids)]
        else:
            account_ids = self.search(cr, uid, args, limit=limit, context=context)
        return self.name_get(cr, uid, account_ids, context=context)

class account_analytic_line(osv.osv):
    _name = 'account.analytic.line'
    _description = 'Analytic Line'

    _columns = {
        'name': fields.char('Description', required=True),
        'date': fields.date('Date', required=True, select=True),
        'amount': fields.float('Amount', required=True, help='Calculated by multiplying the quantity and the price given in the Product\'s cost price. Always expressed in the company main currency.', digits_compute=dp.get_precision('Account')),
        'unit_amount': fields.float('Quantity', help='Specifies the amount of quantity to count.'),
        'account_id': fields.many2one('account.analytic.account', 'Analytic Account', required=True, ondelete='restrict', select=True, domain=[('type','<>','view')]),
        'user_id': fields.many2one('res.users', 'User'),
        'company_id': fields.related('account_id', 'company_id', type='many2one', relation='res.company', string='Company', store=True, readonly=True),

    }

    def _get_default_date(self, cr, uid, context=None):
        return fields.date.context_today(self, cr, uid, context=context)

    def __get_default_date(self, cr, uid, context=None):
        return self._get_default_date(cr, uid, context=context)

    _defaults = {
        'date': __get_default_date,
        'company_id': lambda self,cr,uid,c: self.pool.get('res.company')._company_default_get(cr, uid, 'account.analytic.line', context=c),
        'amount': 0.00
    }

    _order = 'date desc'

    def _check_no_view(self, cr, uid, ids, context=None):
        analytic_lines = self.browse(cr, uid, ids, context=context)
        for line in analytic_lines:
            if line.account_id.type == 'view':
                return False
        return True

    _constraints = [
        (_check_no_view, 'You cannot create analytic line on view account.', ['account_id']),
    ]

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