# -*- coding: utf-8 -*-

from openerp import models, fields, api, _
from openerp.exceptions import UserError

from pytz import timezone, UTC
import logging
import math
from datetime import datetime, timedelta

_logger = logging.getLogger(__name__)


def float_to_time(f):
    decimal, integer = math.modf(f)
    return "%s:%s" % (str(int(integer)).zfill(2), str(int(round(decimal * 60))).zfill(2))

def floatime_to_hour_minute(f):
    decimal, integer = math.modf(f)
    return int(integer), int(round(decimal * 60))

def get_first_day_of_week():
    today = datetime.now()
    return datetime.now() - timedelta(days=today.weekday())

class TaskType(models.Model):
    _name = 'beesdoo.shift.type'

    name = fields.Char()
    description = fields.Text()
    active = fields.Boolean(default=True)

class DayNumber(models.Model):
    _name = 'beesdoo.shift.daynumber'

    _order = 'number asc'

    name = fields.Char()
    number = fields.Integer("Day Number", help="From 1 to N, When you will instanciate your planning, Day 1 will be the start date of the instance, Day 2 the second, etc...")
    active = fields.Boolean(default=True)

class Planning(models.Model):
    _name = 'beesdoo.shift.planning'

    _order = 'sequence asc'

    sequence = fields.Integer()
    name = fields.Char()
    task_template_ids = fields.One2many('beesdoo.shift.template', 'planning_id')

    @api.model
    def _get_next_planning(self, sequence):
        next_planning = self.search([('sequence', '>', sequence)])
        if not next_planning:
            return self.search([])[0]
        return next_planning[0]

    @api.multi
    def _get_next_planning_date(self, date):
        self.ensure_one()
        nb_of_day = max(self.task_template_ids.mapped('day_nb_id.number'))
        return fields.Date.to_string(fields.Date.from_string(date) + timedelta(days=nb_of_day))

    @api.model
    def _generate_next_planning(self):
        config = self.env['ir.config_parameter']
        last_seq = int(config.get_param('last_planning_seq', 0))
        date = config.get_param('next_planning_date', 0)

        planning = self._get_next_planning(last_seq)
        planning = planning.with_context(visualize_date=date)
        planning.task_template_ids._generate_task_day()

        next_date = planning._get_next_planning_date(date)
        config.set_param('last_planning_seq', planning.sequence)
        config.set_param('next_planning_date', next_date)

class TaskTemplate(models.Model):
    _name = 'beesdoo.shift.template'

    _order = 'start_time'

    name = fields.Char(required=True)
    planning_id = fields.Many2one('beesdoo.shift.planning', required=True)
    day_nb_id = fields.Many2one('beesdoo.shift.daynumber', string='Day', required=True)
    task_type_id = fields.Many2one('beesdoo.shift.type', string="Type")
    start_time = fields.Float(required=True)
    end_time = fields.Float(required=True)
    super_coop_id = fields.Many2one('res.users', string="Super Cooperative", domain=[('partner_id.super', '=', True)])

    duration = fields.Float(help="Duration in Hour")
    worker_nb = fields.Integer(string="Number of worker", help="Max number of worker for this task", default=1)
    worker_ids = fields.Many2many('res.partner', string="Recurrent worker assigned", domain=[('eater', '=', 'worker_eater'), ('working_mode', '=', 'regular')])
    remaining_worker = fields.Integer(compute="_get_remaining", store=True, string="Remaining Place")
    active = fields.Boolean(default=True)
    #For Kanban View Only
    color = fields.Integer('Color Index')
    worker_name = fields.Char(compute="_get_worker_name")
    #For calendar View
    start_date = fields.Datetime(compute="_get_fake_date", search="_dummy_search")
    end_date = fields.Datetime(compute="_get_fake_date", search="_dummy_search")

    @api.depends('start_time', 'end_time')
    def _get_fake_date(self):
        # Get context/client specific timezone. If not found log it and
        # assume UTC.
        try:
            context_tz = timezone(
                self._context.get('tz') or self.env.user.tz
            )
        except Exception:
            _logger.debug(
                "failed to compute context/client-specific timestamp, "
                "using the UTC value",
                exc_info=True
            )
            context_tz = UTC
        # Found today date which is the beginning day of the planning
        if self._context.get('visualize_date'):
            today = datetime.strptime(
                self._context.get('visualize_date'),
                '%Y-%m-%d'
            )
        else:
            today = get_first_day_of_week()

        for rec in self:
            # Find the day of this task template 'rec'.
            day = today + timedelta(days=rec.day_nb_id.number - 1)
            # Compute the beginning and ending time according to the
            # context timezone.
            h_begin, m_begin = floatime_to_hour_minute(rec.start_time)
            h_end, m_end = floatime_to_hour_minute(rec.end_time)
            # Create the start_date and end_date of this task template
            # 'rec' according to the context timezone.
            start_date = context_tz.localize(
                day.replace(hour=h_begin, minute=m_begin, second=0)
            )
            end_date = context_tz.localize(
                day.replace(hour=h_end, minute=m_end, second=0)
            )
            # Finally, set the dates in UTC.
            rec.start_date = start_date.astimezone(UTC)
            rec.end_date = end_date.astimezone(UTC)

    def _dummy_search(self, operator, value):
        return []

    @api.depends('worker_ids', 'worker_nb')
    def _get_remaining(self):
        for rec in self:
            rec.remaining_worker =  rec.worker_nb - len(rec.worker_ids)

    @api.depends("worker_ids")
    def _get_worker_name(self):
        for rec in self:
            rec.worker_name = ','.join(rec.worker_ids.mapped('display_name'))

    @api.constrains('worker_nb', 'worker_ids')
    def _nb_worker_max(self):
        for rec in self:
            if len(rec.worker_ids) > rec.worker_nb:
                raise UserError(_('you cannot assign more worker then the number maximal define on the template'))


    @api.onchange('start_time', 'end_time')
    def _get_duration(self):
        if self.start_time and self.end_time:
            self.duration = self.end_time - self.start_time

    @api.onchange('duration')
    def _set_duration(self):
        if self.start_time:
            self.end_time = self.start_time +self.duration

    def _generate_task_day(self):
        tasks = self.env['beesdoo.shift.shift']
        for rec in self:
            for i in xrange(0, rec.worker_nb):
                worker_id = rec.worker_ids[i] if len(rec.worker_ids) > i else False
                #remove worker in holiday and temporary exempted
                if worker_id and worker_id.cooperative_status_ids:
                    status = worker_id.cooperative_status_ids[0]
                    if status.holiday_start_time and status.holiday_end_time and \
                         status.holiday_start_time <= rec.start_date[:10] and status.holiday_end_time >= rec.end_date[:10]:
                        worker_id = False
                    if status.temporary_exempt_start_date and status.temporary_exempt_end_date and \
                         status.temporary_exempt_start_date <= rec.start_date[:10] and status.temporary_exempt_end_date >= rec.end_date[:10]:
                        worker_id = False
                tasks |= tasks.create({
                    'name' :  "%s %s (%s - %s) [%s]" % (rec.name, rec.day_nb_id.name, float_to_time(rec.start_time), float_to_time(rec.end_time), i),
                    'task_template_id' : rec.id,
                    'task_type_id' : rec.task_type_id.id,
                    'super_coop_id': rec.super_coop_id.id,
                    'worker_id' : worker_id and worker_id.id or False,
                    'is_regular': True if worker_id else False,
                    'start_time' : rec.start_date,
                    'end_time' :  rec.end_date,
                    'stage_id': self.env.ref('beesdoo_shift.open').id,
                })
        
        return tasks