# -*- 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/>.
#
##############################################################################

from mx import DateTime
import time

from osv import fields, osv
from tools.translate import _

class hr_action_reason(osv.osv):
    _name = "hr.action.reason"
    _description = "Action Reason"
    _columns = {
        'name' : fields.char('Reason', size=64, required=True, help='Specifies the reason for Signing In/Signing Out.'),
        'action_type' : fields.selection([('sign_in', 'Sign in'), ('sign_out', 'Sign out')], "Action's type"),
    }
    _defaults = {
        'action_type' : lambda *a: 'sign_in',
    }
hr_action_reason()

def _employee_get(obj, cr, uid, context=None):
    ids = obj.pool.get('hr.employee').search(cr, uid, [('user_id','=', uid)])
    if ids:
        return ids[0]
    return False

class hr_attendance(osv.osv):
    _name = "hr.attendance"
    _description = "Attendance"

    def _day_compute(self, cr, uid, ids, fieldnames, args, context=None):
        res = dict.fromkeys(ids, '')
        for obj in self.browse(cr, uid, ids, context=context):
            res[obj.id] = time.strftime('%Y-%m-%d', time.strptime(obj.name, '%Y-%m-%d %H:%M:%S'))

        return res
    _columns = {
        'name' : fields.datetime('Date', required=True),
        'action' : fields.selection([('sign_in', 'Sign In'), ('sign_out', 'Sign Out'),('action','Action')], 'Action', required=True),
        'action_desc' : fields.many2one("hr.action.reason", "Action reason", domain="[('action_type', '=', action)]", help='Specifies the reason for Signing In/Signing Out in case of extra hours.'),
        'employee_id' : fields.many2one('hr.employee', "Employee's Name", required=True, select=True),
        'day' : fields.function(_day_compute, method=True, type='char', string='Day', store=True, select=1, size=32),
    }
    _defaults = {
        'name' : lambda *a: time.strftime('%Y-%m-%d %H:%M:%S'),
        'employee_id' : _employee_get,
    }

    def _altern_si_so(self, cr, uid, ids):
        for id in ids:
            sql = '''
            select action, name
            from hr_attendance as att
            where employee_id = (select employee_id from hr_attendance where id=%s)
            and action in ('sign_in','sign_out')
            and name <= (select name from hr_attendance where id=%s)
            order by name desc
            limit 2 '''

            cr.execute(sql,(id,id))
            atts = cr.fetchall()
            if not ((len(atts)==1 and atts[0][0] == 'sign_in') or (atts[0][0] != atts[1][0] and atts[0][1] != atts[1][1])):
                return False
        return True

    _constraints = [(_altern_si_so, 'Error: Sign in (resp. Sign out) must follow Sign out (resp. Sign in)', ['action'])]
    _order = 'name desc'
hr_attendance()

class hr_employee(osv.osv):
    _inherit = "hr.employee"
    _description = "Employee"

    def _state(self, cr, uid, ids, name, args, context=None):
        result = {}
        for id in ids:
            result[id] = 'absent'
        cr.execute('SELECT hr_attendance.action, hr_attendance.employee_id \
                FROM ( \
                    SELECT MAX(name) AS name, employee_id \
                    FROM hr_attendance \
                    WHERE action in (\'sign_in\', \'sign_out\') \
                    GROUP BY employee_id \
                ) AS foo \
                LEFT JOIN hr_attendance \
                    ON (hr_attendance.employee_id = foo.employee_id \
                        AND hr_attendance.name = foo.name) \
                WHERE hr_attendance.employee_id IN %s',(tuple(ids),))
        for res in cr.fetchall():
            result[res[1]] = res[0] == 'sign_in' and 'present' or 'absent'
        return result

    _columns = {
       'state': fields.function(_state, method=True, type='selection', selection=[('absent', 'Absent'), ('present', 'Present')], string='Attendance'),
     }

    def _action_check(self, cr, uid, emp_id, dt=False,context={}):
        cr.execute('select max(name) from hr_attendance where employee_id=%s', (emp_id,))
        res = cr.fetchone()
        return not (res and (res[0]>=(dt or time.strftime('%Y-%m-%d %H:%M:%S'))))

    def attendance_action_change(self, cr, uid, ids, type='action', context={}, dt=False, *args):
        id = False
        warning_sign = 'sign'

        #Special case when button calls this method :type=context
        if isinstance(type,dict):
            type = type.get('type','action')

        if type == 'sign_in':
            warning_sign = "Sign In"
        elif type == 'sign_out':
            warning_sign = "Sign Out"

        for emp in self.read(cr, uid, ids, ['id'], context=context):
            if not self._action_check(cr, uid, emp['id'], dt, context):
                raise osv.except_osv(_('Warning'), _('You tried to %s with a date anterior to another event !\nTry to contact the administrator to correct attendances.')%(warning_sign,))

            res = {'action' : type, 'employee_id' : emp['id']}

            if dt:
                res['name'] = dt

            id = self.pool.get('hr.attendance').create(cr, uid, res, context=context)

        if type != 'action':
            return id
        return True

hr_employee()

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