# -*- coding: utf-8 -*-
from datetime import datetime as dtdatetime, time as dttime
from odoo import models, fields, api
from pytz import timezone, utc

def float2time(fhours, seconds=False):
    hrs = int(fhours)
    fmin = (fhours - hrs) * 60
    min = int(fmin)
    sec = 0
    if seconds:
        fsec = (fmin - min) * 60
        sec = int(fsec)
    return dttime(hrs, min, sec)


class RestaurantBooking(models.Model):
    _name = 'restaurant.booking'
    _description = "Restaurant booking"
    _order = 'date, time_start, count desc'

    @api.model
    def default_get(self, fields_list):
        defaults = super().default_get(fields_list)
        start = self.env.context.get('default_datetime_start', False)
        table_id = self.env.context.get('default_table_id', False)
        if start:
            defaults['date'] = start[:10]
            dtstart = fields.Datetime.context_timestamp(self, fields.Datetime.to_datetime(start))
            tstart = dtstart.hour
            if tstart:
                defaults['time_start'] = tstart
        if table_id:
            defaults['table_ids'] = [(6, 0, [table_id])]
        return defaults

    name = fields.Char(string="Name", required=True)
    date = fields.Date(string="Date", required=True)
    time_start = fields.Float(string="Start", required=True, group_operator=False)
    time_stop = fields.Float(string="Stop", compute="_get_time_stop", store=True, inverse="_set_time_stop",
        required=True, group_operator=False)
    duration = fields.Float(string="Duration", required=True, group_operator=False)
    datetime_start = fields.Datetime(string="Date start", compute="_get_datetimes", store=True)
    datetime_stop = fields.Datetime(string="Date stop", compute="_get_datetimes", store=True)
    count = fields.Integer(string="People count", required=True)
    available_table_ids = fields.Many2many(comodel_name='restaurant.table', string="Available tables",
        column1="booking_id", column2="table_id", relation="booking_available_table_rel",
        compute="_get_available_tables")
    table_ids = fields.Many2many(comodel_name='restaurant.table', string="Tables", required=True,
        column1="booking_id", column2="table_id", relation="booking_table_rel",
        domain="[('id', 'in', available_table_ids)]")
    table_capacity = fields.Integer(string="Capacity", compute="_get_table_capacity")
    table_capacity_ok = fields.Boolean(string="Capacity OK", compute="_check_table_capacity")
    table_booking_ids = fields.One2many(comodel_name="restaurant.table_booking", inverse_name="booking_id",
        string="Tables bookings", readonly=True)

    @api.depends('time_start', 'duration')
    def _get_time_stop(self):
        for booking in self:
            if booking.time_start and booking.duration:
                booking.time_stop = booking.time_start + booking.duration
            else:
                booking.time_stop = 0.0

    @api.onchange('time_stop')
    def _set_time_stop(self):
        for booking in self:
            stop = booking.time_stop
            if stop:
                booking.duration = stop - booking.time_start

    @api.depends('date', 'time_start', 'time_stop')
    def _get_datetimes(self):
        user_tz = timezone(self.env.user.tz)
        for booking in self:
            date = booking.date
            if date and booking.time_start:
                dt_start = user_tz.localize(dtdatetime.combine(date, float2time(booking.time_start)))
                booking.datetime_start = dt_start.astimezone(utc).replace(tzinfo=None)
            else:
                booking.datetime_start = False
            if date and booking.time_stop:
                dt_stop = user_tz.localize(dtdatetime.combine(date, float2time(booking.time_stop)))
                booking.datetime_stop = dt_stop.astimezone(utc).replace(tzinfo=None)
            else:
                booking.datetime_stop = False

    @api.depends('table_ids')
    def _get_table_capacity(self):
        for booking in self:
            booking.table_capacity = sum(booking.table_ids.mapped('seats'))

    @api.depends('table_capacity', 'count')
    def _check_table_capacity(self):
        for booking in self:
            booking.table_capacity_ok = bool(booking.table_capacity >= booking.count)

    @api.depends('datetime_start', 'datetime_stop', 'table_ids')
    def _get_available_tables(self):
        Table = self.env['restaurant.table']
        TableBooking = self.env['restaurant.table_booking']
        for booking in self:
            if booking.datetime_start and booking.datetime_stop:
                tbookings = TableBooking.search([
                    '|', '&', ('datetime_start', '<', booking.datetime_stop),
                              ('datetime_start', '>=', booking.datetime_start),
                         '&', ('datetime_stop', '>', booking.datetime_start),
                              ('datetime_stop', '<=', booking.datetime_stop)
                ])
                booking.available_table_ids = Table.search([
                    ('bookable', '=', True),
                    ('id', 'not in', tbookings.mapped('table_id').ids),
                ]) - booking.table_ids
            else:
                booking.available_table_ids = [(5, 0, 0)]

    @api.model_create_multi
    def create(self, vals_list):
        for vals in vals_list:
            vals.update({
                'table_booking_ids': [(0, 0, {'table_id': table_id}) for table_id in vals['table_ids'][0][2]]
            })
        res = super().create(vals_list)
        return res

    def write(self, vals):
        res = super().write(vals)
        TableBooking = self.env['restaurant.table_booking']
        to_unlink = TableBooking
        for booking in self:
            tables = booking.table_ids
            table_bookings = booking.table_booking_ids
            delete = table_bookings.filtered(lambda rtb: rtb.table_id not in tables)
            to_unlink |= delete
            to_create = tables - (table_bookings - delete).mapped('table_id')
            if to_create:
                TableBooking.create([{
                    'booking_id': booking.id,
                    'table_id': table.id,
                } for table in to_create])
        if to_unlink:
            to_unlink.unlink()
        return res