# -*- coding: utf-8 -*-
from openerp import models, fields, api, _
from openerp.exceptions import ValidationError

from datetime import timedelta, datetime
import logging
from openerp.osv.fields import related

_logger = logging.getLogger(__name__)
PERIOD = 28  # TODO: use system parameter

def add_days_delta(date_from, days_delta):
    if not date_from:
        return date_from
    next_date = fields.Date.from_string(date_from) + timedelta(days=days_delta)
    return fields.Date.to_string(next_date)

class ExemptReason(models.Model):
    _name = 'cooperative.exempt.reason'

    name = fields.Char(required=True)

class HistoryStatus(models.Model):
    _name = 'cooperative.status.history'

    _order= 'create_date desc'

    status_id = fields.Many2one('cooperative.status')
    cooperator_id = fields.Many2one('res.partner')
    change = fields.Char()
    type = fields.Selection([('status', 'Status Change'), ('counter', 'Counter Change')])
    user_id = fields.Many2one('res.users', string="User")

class CooperativeStatus(models.Model):
    _name = 'cooperative.status'
    _rec_name = 'cooperator_id'
    _order = 'cooperator_id'


    today = fields.Date(help="Field that allow to compute field and store them even if they are based on the current date", default=fields.Date.today)
    cooperator_id = fields.Many2one('res.partner')
    active = fields.Boolean(related="cooperator_id.active", store=True, index=True)
    info_session = fields.Boolean('Information Session ?')
    info_session_date = fields.Datetime('Information Session Date')
    super = fields.Boolean("Super Cooperative")
    sr = fields.Integer("Compteur shift regulier", default=0)
    sc = fields.Integer("Compteur shift de compensation", default=0)
    time_extension = fields.Integer("Extension Days NB", default=0, help="Addtional days to the automatic extension, 5 mean that you have a total of 15 extension days of default one is set to 10")
    holiday_start_time = fields.Date("Holidays Start Day")
    holiday_end_time = fields.Date("Holidays End Day")
    alert_start_time = fields.Date("Alert Start Day")
    extension_start_time = fields.Date("Extension Start Day")
    #Champ compute
    working_mode = fields.Selection(
        [
            ('regular', 'Regular worker'),
            ('irregular', 'Irregular worker'),
            ('exempt', 'Exempted'),
        ],
        string="Working mode"
    )
    exempt_reason_id = fields.Many2one('cooperative.exempt.reason', 'Exempt Reason')
    status = fields.Selection([('ok',  'Up to Date'),
                               ('holiday', 'Holidays'),
                               ('alert', 'Alerte'),
                               ('extension', 'Extension'),
                               ('suspended', 'Suspended'),
                               ('exempted', 'Exempted'),
                               ('unsubscribed', 'Unsubscribed'),
                               ('resigning', 'Resigning')],
                              compute="_compute_status", string="Cooperative Status", store=True)
    can_shop = fields.Boolean(compute='_compute_status', store=True)
    history_ids = fields.One2many('cooperative.status.history', 'status_id', readonly=True)
    unsubscribed = fields.Boolean(default=False, help="Manually unsubscribed")
    resigning = fields.Boolean(default=False, help="Want to leave the beescoop")

    #Specific to irregular
    irregular_start_date = fields.Date()  #TODO migration script
    irregular_absence_date = fields.Date()
    irregular_absence_counter = fields.Integer() #TODO unsubscribe when reach -2
    future_alert_date = fields.Date(compute='_compute_future_alert_date')

    temporary_exempt_reason_id = fields.Many2one('cooperative.exempt.reason', 'Exempt Reason')
    temporary_exempt_start_date = fields.Date()
    temporary_exempt_end_date = fields.Date()


    @api.depends('today', 'sr', 'sc', 'holiday_end_time',
                 'holiday_start_time', 'time_extension',
                 'alert_start_time', 'extension_start_time',
                 'unsubscribed', 'irregular_absence_date',
                 'irregular_absence_counter', 'temporary_exempt_start_date',
                 'temporary_exempt_end_date', 'resigning', 'cooperator_id.subscribed_shift_ids')
    def _compute_status(self):
        alert_delay = int(self.env['ir.config_parameter'].get_param('alert_delay', 28))
        grace_delay = int(self.env['ir.config_parameter'].get_param('default_grace_delay', 10))
        update = int(self.env['ir.config_parameter'].get_param('always_update', False))
        for rec in self:
            if update or not rec.today:
                rec.status = 'ok'
                rec.can_shop = True
                continue
            if rec.resigning:
                rec.status = 'resigning'
                rec.can_shop = False
                continue

            if rec.working_mode == 'regular':
                rec._set_regular_status(grace_delay, alert_delay)
            elif rec.working_mode == 'irregular':
                rec._set_irregular_status(grace_delay, alert_delay)
            elif rec.working_mode == 'exempt':
                rec.status = 'ok'
                rec.can_shop = True

    @api.depends('today', 'irregular_start_date', 'sr')
    def _compute_future_alert_date(self):
        """Compute date before which the worker is up to date"""
        for rec in self:
            future_alert_date = False
            if not rec.alert_start_time and rec.irregular_start_date:
                today_date = fields.Date.from_string(rec.today)
                delta = (today_date - fields.Date.from_string(rec.irregular_start_date)).days
                future_alert_date = today_date + timedelta(days=(rec.sr + 1) * PERIOD - delta % PERIOD)
                future_alert_date = future_alert_date.strftime('%Y-%m-%d')
            rec.future_alert_date = future_alert_date

    def _set_regular_status(self, grace_delay, alert_delay):
        self.ensure_one()
        ok = self.sr >= 0 and self.sc >= 0
        grace_delay = grace_delay + self.time_extension

        if self.sr < -1 or self.unsubscribed or not self.cooperator_id.subscribed_shift_ids:
            self.status = 'unsubscribed'
            self.can_shop = False
        elif self.today >= self.temporary_exempt_start_date and self.today <= self.temporary_exempt_end_date:
            self.status = 'exempted'
            self.can_shop = True

        #Transition to alert sr < 0 or stay in alert sr < 0 or sc < 0 and thus alert time is defined
        elif not ok and self.alert_start_time and self.extension_start_time and self.today <= add_days_delta(self.extension_start_time, grace_delay):
            self.status = 'extension'
            self.can_shop = True
        elif not ok and self.alert_start_time and self.extension_start_time and self.today > add_days_delta(self.extension_start_time, grace_delay):
            self.status = 'suspended'
            self.can_shop = False
        elif not ok and self.alert_start_time and self.today > add_days_delta(self.alert_start_time, alert_delay):
            self.status = 'suspended'
            self.can_shop = False
        elif (self.sr < 0) or (not ok and self.alert_start_time):
            self.status = 'alert'
            self.can_shop = True

        #Check for holidays; Can be in holidays even in alert or other mode ?
        elif self.today >= self.holiday_start_time and self.today <= self.holiday_end_time:
            self.status = 'holiday'
            self.can_shop = False
        elif ok or (not self.alert_start_time and self.sr >= 0):
            self.status = 'ok'
            self.can_shop = True

    def _set_irregular_status(self, grace_delay, alert_delay):
        counter_unsubscribe = int(self.env['ir.config_parameter'].get_param('irregular_counter_to_unsubscribe', -3))
        self.ensure_one()
        ok = self.sr >= 0
        grace_delay = grace_delay + self.time_extension
        if self.sr <= counter_unsubscribe or self.unsubscribed:
            self.status = 'unsubscribed'
            self.can_shop = False
        elif self.today >= self.temporary_exempt_start_date and self.today <= self.temporary_exempt_end_date:
            self.status = 'exempted'
            self.can_shop = True
        #Transition to alert sr < 0 or stay in alert sr < 0 or sc < 0 and thus alert time is defined
        elif not ok and self.alert_start_time and self.extension_start_time and self.today <= add_days_delta(self.extension_start_time, grace_delay):
            self.status = 'extension'
            self.can_shop = True
        elif not ok and self.alert_start_time and self.extension_start_time and self.today > add_days_delta(self.extension_start_time, grace_delay):
            self.status = 'suspended'
            self.can_shop = False
        elif not ok and self.alert_start_time and self.today > add_days_delta(self.alert_start_time, alert_delay):
            self.status = 'suspended'
            self.can_shop = False
        elif (self.sr < 0) or (not ok and self.alert_start_time):
            self.status = 'alert'
            self.can_shop = True

        #Check for holidays; Can be in holidays even in alert or other mode ?
        elif self.today >= self.holiday_start_time and self.today <= self.holiday_end_time:
            self.status = 'holiday'
            self.can_shop = False
        elif ok or (not self.alert_start_time and self.sr >= 0):
            self.status = 'ok'
            self.can_shop = True

    @api.multi
    def write(self, vals):
        """
            Overwrite write to historize the change
        """
        for field in ['sr', 'sc', 'time_extension', 'extension_start_time', 'alert_start_time', 'unsubscribed']:
            if not field in vals:
                continue
            for rec in self:
                data = {
                        'status_id': rec.id,
                        'cooperator_id': rec.cooperator_id.id,
                        'type': 'counter',
                        'user_id': self.env.context.get('real_uid', self.env.uid),
                }
                if vals.get(field, rec[field]) != rec[field]:
                    data['change'] = '%s: %s -> %s' % (field.upper(), rec[field], vals.get(field))
                    self.env['cooperative.status.history'].sudo().create(data)
        return super(CooperativeStatus, self).write(vals)

    def _state_change(self, new_state, old_stage):
        self.ensure_one()
        if new_state == 'alert':
            self.write({'alert_start_time': self.today, 'extension_start_time': False, 'time_extension': 0})
        if new_state == 'ok': #reset alert start time if back to ok
            self.write({'alert_start_time': False, 'extension_start_time': False, 'time_extension': 0})
        if new_state == 'unsubscribed':
            self.cooperator_id.sudo().write({'subscribed_shift_ids' : [(5,0,0)]})
            #TODO: Add one day othertwise unsubscribed from the shift you were absent
            self.env['beesdoo.shift.shift'].sudo().unsubscribe_from_today([self.cooperator_id.id], today=self.today)

    def _change_counter(self, data):
        self.sc += data.get('sc', 0)
        self.sr += data.get('sr', 0)
        self.irregular_absence_counter += data.get('irregular_absence_counter', 0)
        self.irregular_absence_date = data.get('irregular_absence_date', False)

    @api.multi
    def _write(self, vals):
        """
            Overwrite write to historize the change of status
            and make action on status change
        """
        if 'status' in vals:
            self._cr.execute('select id, status, sr, sc from "%s" where id in %%s' % self._table, (self._ids,))
            result = self._cr.dictfetchall()
            old_status_per_id = {r['id'] : r for r in result}
            for rec in self:
                if old_status_per_id[rec.id]['status'] != vals['status']:
                    data = {
                        'status_id': rec.id,
                        'cooperator_id': rec.cooperator_id.id,
                        'type': 'status',
                        'change': "STATUS: %s -> %s" % (old_status_per_id[rec.id]['status'], vals['status']),
                        'user_id': self.env.context.get('real_uid', self.env.uid),
                    }
                    self.env['cooperative.status.history'].sudo().create(data)
                    rec._state_change(vals['status'], old_status_per_id[rec.id]['status'])
        return super(CooperativeStatus, self)._write(vals)

    _sql_constraints = [
        ('cooperator_uniq', 'unique (cooperator_id)', _('You can only set one cooperator status per cooperator')),
    ]

    @api.model
    def _set_today(self):
        """
            Method call by the cron to update store value base on the date
        """
        self.search([]).write({'today': fields.Date.today()})

    @api.multi
    def clear_history(self):
        self.ensure_one()
        self.history_ids.unlink()
    
    @api.model
    def _cron_compute_counter_irregular(self, today=False):
        today = today or fields.Date.today()
        journal = self.env['beesdoo.shift.journal'].search([('date', '=', today)])
        if not journal:
            journal = self.env['beesdoo.shift.journal'].create({'date': today})
        domain = ['&',
                                     '&',
                                        '&', ('status', '!=', 'unsubscribed'),
                                             ('working_mode', '=', 'irregular'),
                                        ('irregular_start_date', '!=', False),
                                     '|',
                                        '|', ('holiday_start_time', '=', False), ('holiday_end_time', '=', False),
                                        '|', ('holiday_start_time', '>', today), ('holiday_end_time', '<', today),
        ]
        irregular = self.search(domain)
        today_date = fields.Date.from_string(today)
        for status in irregular:
            if status.status == 'exempted':
                continue
            delta = (today_date - fields.Date.from_string(status.irregular_start_date)).days
            if delta and delta % PERIOD == 0 and status not in journal.line_ids:
                if status.sr > 0:
                    status.sr -= 1
                else:
                    status.sr -= 2
                journal.line_ids |= status
        
        
class ShiftCronJournal(models.Model):
    _name = 'beesdoo.shift.journal'
    _order = 'date desc'
    _rec_name = 'date'
    
    date = fields.Date()
    line_ids = fields.Many2many('cooperative.status')
    
    _sql_constraints = [
        ('one_entry_per_day', 'unique (date)', _('You can only create one journal per day')),
    ]
    
    @api.multi
    def run(self):
        self.ensure_one()
        if not self.user_has_groups('beesdoo_shift.group_cooperative_admin'):
            raise ValidationError(_("You don't have the access to perform this action"))
        self.sudo().env['cooperative.status']._cron_compute_counter_irregular(today=self.date)
   
class ResPartner(models.Model):
    _inherit = 'res.partner'

    cooperative_status_ids = fields.One2many('cooperative.status', 'cooperator_id', readonly=True)
    super = fields.Boolean(related='cooperative_status_ids.super', string="Super Cooperative", readonly=True, store=True)
    info_session = fields.Boolean(related='cooperative_status_ids.info_session', string='Information Session ?', readonly=True, store=True)
    info_session_date = fields.Datetime(related='cooperative_status_ids.info_session_date', string='Information Session Date', readonly=True, store=True)
    working_mode = fields.Selection(related='cooperative_status_ids.working_mode', readonly=True, store=True)
    exempt_reason_id = fields.Many2one(related='cooperative_status_ids.exempt_reason_id', readonly=True, store=True)
    state = fields.Selection(related='cooperative_status_ids.status', readonly=True, store=True)
    extension_start_time = fields.Date(related='cooperative_status_ids.extension_start_time', string="Extension Start Day", readonly=True, store=True)
    subscribed_shift_ids = fields.Many2many('beesdoo.shift.template')

    @api.multi
    def coop_subscribe(self):
        return {
           'name': _('Subscribe Cooperator'),
           'type': 'ir.actions.act_window',
           'view_type': 'form',
           'view_mode': 'form',
           'res_model': 'beesdoo.shift.subscribe',
           'target': 'new',
        }

    @api.multi
    def coop_unsubscribe(self):
        res = self.coop_subscribe()
        res['context'] = {'default_unsubscribed': True}
        return res

    @api.multi
    def manual_extension(self):
        return {
           'name': _('Manual Extension'),
           'type': 'ir.actions.act_window',
           'view_type': 'form',
           'view_mode': 'form',
           'res_model': 'beesdoo.shift.extension',
           'target': 'new',
        }

    @api.multi
    def auto_extension(self):
        res = self.manual_extension()
        res['context'] = {'default_auto': True}
        res['name'] = _('Trigger Grace Delay')
        return res

    @api.multi
    def register_holiday(self):
        return {
           'name': _('Register Holiday'),
           'type': 'ir.actions.act_window',
           'view_type': 'form',
           'view_mode': 'form',
           'res_model': 'beesdoo.shift.holiday',
           'target': 'new',
        }

    @api.multi
    def temporary_exempt(self):
        return {
           'name': _('Temporary Exemption'),
           'type': 'ir.actions.act_window',
           'view_type': 'form',
           'view_mode': 'form',
           'res_model': 'beesdoo.shift.temporary_exemption',
           'target': 'new',
        }

    #TODO access right + vue on res.partner
    #TODO can_shop : Status can_shop ou extempted ou part C