from odoo import models, fields, api, _
from odoo.exceptions import ValidationError, UserError

from datetime import timedelta, datetime
import logging

_logger = logging.getLogger(__name__)

def add_days_delta(date_from, days_delta):
    if not date_from:
        return date_from
    next_date = date_from + timedelta(days=days_delta)
    return 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'
    _period = 28

    def _get_status(self):
        return [
            ('ok',  'Up to Date'),
            ('holiday', 'Holidays'),
            ('alert', 'Alerte'),
            ('extension', 'Extension'),
            ('suspended', 'Suspended'),
            ('exempted', 'Exempted'),
            ('unsubscribed', 'Unsubscribed'),
            ('resigning', 'Resigning')
        ]

    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.Date('Information Session Date')
    super = fields.Boolean("Super Cooperative")
    sr = fields.Integer("Regular shifts counter", default=0)
    sc = fields.Integer("Compensation shifts counter", 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")
    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(selection=_get_status,
                              compute="_compute_status", string="Cooperative Status", store=True)
    can_shop = fields.Boolean(compute='_compute_can_shop', 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')
    next_countdown_date = fields.Date(compute='_compute_next_countdown_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('status')
    def _compute_can_shop(self):
        for rec in self:
            rec.can_shop = rec.status in self._can_shop_status()

    @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):
        update = int(self.env['ir.config_parameter'].sudo().get_param('always_update', False))
        for rec in self:
            if update or not rec.today:
                rec.status = 'ok'
                continue
            if rec.resigning:
                rec.status = 'resigning'
                continue

            if rec.working_mode == 'regular':
                rec.status = rec._get_regular_status()
            elif rec.working_mode == 'irregular':
                rec.status = rec._get_irregular_status()
            elif rec.working_mode == 'exempt':
                rec.status = 'ok'

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

    @api.constrains("working_mode", "irregular_start_date")
    def _constrains_irregular_start_date(self):
        if self.working_mode == "irregular" and not self.irregular_start_date:
            raise UserError(_("Irregular workers must have an irregular start date."))

    @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)

    @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'])
        return super(CooperativeStatus, self)._write(vals)

    def get_status_value(self):
        """
        Workararound to get translated selection value instead of key in mail template.
        """
        state_list = self.env["cooperative.status"]._fields['status']._description_selection(self.env)
        return dict(state_list)[self.status]

    @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.model
    def _cron_compute_counter_irregular(self, today=False):
        """
            Journal ensure that a irregular worker will be only check
            once per day
        """
        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 = self._get_irregular_worker_domain(today=today)
        irregular = self.search(domain)
        for status in irregular:
            delta = (today - status.irregular_start_date).days
            if delta and delta % self._period == 0 and status not in journal.line_ids:
                status._change_irregular_counter()
                journal.line_ids |= status

    @api.multi
    def clear_history(self):
        self.ensure_one()
        self.history_ids.unlink()

    ########################################################
    #                   Method to override                 #
    #           To define the behavior of the status       #
    #                                                      #
    #       By default: everyone is always up to date      #
    ########################################################

    ##############################
    #   Computed field section   #
    ##############################
    @api.depends('today')
    def _compute_future_alert_date(self):
        """
            Compute date until the worker is up to date
            for irregular worker
        """
        for rec in self:
            rec.future_alert_date = False

    @api.depends('today')
    def _compute_next_countdown_date(self):
        """
        Compute the following countdown date. This date is the date when
        the worker will see his counter changed due to the cron. This
        date is like the birthday date of the worker that occurred each
        _period.
        """
        for rec in self:
            rec.next_countdown_date = False

    def _can_shop_status(self):
        """
            return the list of status that give access
            to active cooperator privilege
        """
        return ['ok', 'alert', 'extension', 'exempted']

    #####################################
    #   Status Change implementation    #
    #####################################

    def _get_regular_status(self):
        """
            Return the value of the status
            for the regular worker
        """
        return 'ok'

    def _get_irregular_status(self):
        """
            Return the value of the status
            for the irregular worker
        """
        return 'ok'

    def _state_change(self, new_state):
        """
            Hook to watch change in the state
        """
        pass

    def _change_counter(self, data):
        """
            Call when a shift state is changed
            use data generated by _get_counter_date_state_change
        """
        pass


    ###############################################
    ###### Irregular Cron implementation ##########
    ###############################################

    def _get_irregular_worker_domain(self):
        """
            return the domain the give the list
            of valid irregular worker that should
            get their counter changed by the cron
        """
        return [(0, '=', 1)]

    def _change_irregular_counter(self):
        """
            Define how the counter will change
            for the irregular worker
            where today - start_date is a multiple of the period
            by default 28 days
        """
        pass

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):
    """
    One2many relationship with CooperativeStatus should
    be replaced by inheritance.
    """
    _inherit = 'res.partner'

    worker_store = fields.Boolean(default=False)
    is_worker = fields.Boolean(related="worker_store", string="Worker", readonly=False)
    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.Date(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