# -*- coding: utf-8 -*-
import math
from datetime import datetime, date, timedelta, time
from dateutil.rrule import rrule, DAILY
from pytz import timezone, UTC, utc

from odoo import fields, models, api, _


class LuncheonVouchersAllocation(models.Model):
    _name = "hr.lv.allocation"
    _description = "Luncheon Vouchers Allocation"
    _order = "create_date desc"
    _inherit = ["mail.thread", "mail.activity.mixin"]
    _mail_post_access = "read"

    name = fields.Char('Name')
    distrib_campaign_name = fields.Char('Distribution campaign')
    state = fields.Selection(
        [
            ("draft", "Draft"),
            ("confirmed", "Confirmed"),
            ("distributed", "Distributed"),
        ],
        string="Status",
        readonly=True,
        tracking=True,
        copy=False,
        default="draft",
        help="The status is set to 'Draft', when an allocation request is created."
        + "\nThe status is 'Confirmed', when an allocation request is confirmed by HR manager."
        + "\nThe status is 'Distributed', when the luncheon vouchers have been distributed.",
    )
    date_from = fields.Datetime(
        string=_("Start Date"),
        store=True,
        readonly=False,
        copy=False,
        tracking=True,
        states={
            "confirmed": [("readonly", True)],
            "distributed": [("readonly", True)],
        },
    )
    date_to = fields.Datetime(
        string=_("End Date"),
        store=True,
        readonly=False,
        copy=False,
        tracking=True,
        states={
            "confirmed": [("readonly", True)],
            "distributed": [("readonly", True)],
        },
    )
    employee_id = fields.Many2one(
        "hr.employee",
        store=True,
        string=_("Employee"),
        index=True,
        readonly=False,
        ondelete="restrict",
        tracking=True,
        states={
            "confirmed": [("readonly", True)],
            "distributed": [("readonly", True)],
        },
    )
    number_acquired_lv = fields.Integer(
        string=_("Acquired Vouchers"),
        store=True,
        readonly=False,
        tracking=True,
        states={
            "confirmed": [("readonly", True)],
            "distributed": [("readonly", True)],
        },
    )
    number_dued_lv = fields.Integer(
        string=_("Dued Vouchers"),
        store=True,
        readonly=False,
        tracking=True,
        states={
            "confirmed": [("readonly", True)],
            "distributed": [("readonly", True)],
        },
    )
    number_distributed_lv = fields.Integer(
        string=_("Distributed Vouchers"),
        store=True,
        readonly=False,
        tracking=True,
        states={
            "confirmed": [("readonly", False)],
            "distributed": [("readonly", True)],
        },
    )

    @api.model_create_multi
    def create(self, values):
        res = super(LuncheonVouchersAllocation, self).create(values)
        res._calculate_number_acquired_lv()
        res._calculate_number_dued_lv()
        res._default_number_distributed_lv()
        return res

    @api.depends("employee_id")
    def _default_number_distributed_lv(self):
        for record in self:
            record.number_distributed_lv = record.employee_id.default_monthly_lv

    def _has_cancelling_voucher_event(self, day):
        category_no_voucher_ids = self.env["calendar.event.type"].search([("remove_luncheon_voucher", "=", True)])
        events = self.env["calendar.event"].search([("categ_ids", "in", category_no_voucher_ids.ids)])
        day_start = fields.Datetime.to_datetime(day.date())
        day_end = fields.Datetime.to_datetime(day.date()) + timedelta(hours=24)
        cancelling_events = events.filtered(lambda x: not((x.start < day_start) and (x.stop <= day_start)) and not((x.start >= day_end) and (x.stop > day_end)) )
        if len(cancelling_events) > 0:
            return True
        else:
            return False

    def _calculate_number_acquired_lv(self):
        nb_eligible_days = 0
        dfrom = datetime.combine(fields.Date.from_string(self.date_from), time.min).replace(tzinfo=UTC)
        dto = datetime.combine(fields.Date.from_string(self.date_to), time.max).replace(tzinfo=UTC)
        period_days = rrule(DAILY, dfrom, until=dto)
        calendar_resource = self.employee_id.resource_calendar_id
        for day in period_days:
            # Check if this days is a working day
            if not calendar_resource.is_working_day(day):
                continue
            # The employee should work this day but...
            if self.env.company.hr_half_day_cancels_voucher and not calendar_resource.is_full_working_day(day):
                # The luncheon voucher is acquired only if the employee has worked the entire day 
                continue
            # Check leaves
            if not calendar_resource.is_worked_day(self.employee_id, day):
                continue
            # The employee has worked this day but...
            if self.env.company.hr_half_day_cancels_voucher and not calendar_resource.all_attendances_worked(self.employee_id.resource_id, day):
                # The luncheon voucher is acquired only if the employee has worked the entire day
                continue
            # Check there is no event cancelling the voucher
            if self._has_cancelling_voucher_event(day):
                continue
            # All checks passed, the days is eligible for a voucher
            nb_eligible_days += 1
        self.number_acquired_lv = nb_eligible_days

    def _calculate_number_dued_lv(self):
        for record in self:
            if record.state == "distributed":
                record.number_dued_lv = record.employee_id.dued_lv
            else:
                record.number_dued_lv = (
                    record.employee_id.dued_lv + record.number_acquired_lv
                )

    def confirm_allocation(self):
        for record in self:
            if record.state == "draft":
                record.state = "confirmed"
                record.employee_id._compute_total_acquired_lv()
                record.employee_id._compute_dued_lv()

    def back_to_draft(self):
        for record in self:
            if record.state in ["confirmed","distributed"]:
                record.state = "draft"
                record.employee_id._compute_total_acquired_lv()
                record.employee_id._compute_distributed_lv()
                record.employee_id._compute_dued_lv()

    def distribute_allocation(self):
        for record in self:
            if record.state == "confirmed":
                record.state = "distributed"
                record.employee_id._compute_distributed_lv()
                record.employee_id._compute_dued_lv()

    def adjust_distribution(self):
        for record in self:
            for record in self:
                if record.state == "draft":
                    record.number_distributed_lv = record.employee_id.dued_lv + record.number_acquired_lv