# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.
import json

from babel.dates import format_date
from dateutil import relativedelta
from datetime import timedelta, datetime
from functools import partial
from pytz import timezone
from random import randint

from odoo import api, exceptions, fields, models, _
from odoo.exceptions import UserError, ValidationError
from odoo.addons.resource.models.utils import make_aware, Intervals
from odoo.tools.date_utils import start_of, end_of
from odoo.tools.float_utils import float_compare, float_round
from odoo.tools.misc import get_lang


class MrpWorkcenter(models.Model):
    _name = 'mrp.workcenter'
    _description = 'Work Center'
    _order = "sequence, id"
    _inherit = ['mail.thread', 'resource.mixin']
    _check_company_auto = True

    # resource
    name = fields.Char('Work Center', related='resource_id.name', store=True, readonly=False)
    time_efficiency = fields.Float('Time Efficiency', related='resource_id.time_efficiency', default=100, store=True, readonly=False)
    active = fields.Boolean('Active', related='resource_id.active', default=True, store=True, readonly=False)

    code = fields.Char('Code', copy=False)
    note = fields.Html(
        'Description')
    default_capacity = fields.Float(
        'Capacity', default=1.0,
        help="Default number of pieces (in product UoM) that can be produced in parallel (at the same time) at this work center. For example: the capacity is 5 and you need to produce 10 units, then the operation time listed on the BOM will be multiplied by two. However, note that both time before and after production will only be counted once.")
    sequence = fields.Integer(
        'Sequence', default=1, required=True,
        help="Gives the sequence order when displaying a list of work centers.")
    color = fields.Integer('Color')
    currency_id = fields.Many2one('res.currency', 'Currency', related='company_id.currency_id', readonly=True, required=True)
    costs_hour = fields.Float(string='Cost per hour', help='Hourly processing cost.', default=0.0, tracking=True)
    time_start = fields.Float('Setup Time')
    time_stop = fields.Float('Cleanup Time')
    routing_line_ids = fields.One2many('mrp.routing.workcenter', 'workcenter_id', "Routing Lines")
    has_routing_lines = fields.Boolean(compute='_compute_has_routing_lines', help='Technical field for workcenter views')
    order_ids = fields.One2many('mrp.workorder', 'workcenter_id', "Orders")
    workorder_count = fields.Integer('# Work Orders', compute='_compute_workorder_count')
    workorder_ready_count = fields.Integer('# Ready Work Orders', compute='_compute_workorder_count')
    workorder_progress_count = fields.Integer('Total Running Orders', compute='_compute_workorder_count')
    workorder_pending_count = fields.Integer('Total Pending Orders', compute='_compute_workorder_count')
    workorder_late_count = fields.Integer('Total Late Orders', compute='_compute_workorder_count')

    time_ids = fields.One2many('mrp.workcenter.productivity', 'workcenter_id', 'Time Logs')
    working_state = fields.Selection([
        ('normal', 'Normal'),
        ('blocked', 'Blocked'),
        ('done', 'In Progress')], 'Workcenter Status', compute="_compute_working_state", store=True)
    blocked_time = fields.Float(
        'Blocked Time', compute='_compute_blocked_time',
        help='Blocked hours over the last month', digits=(16, 2))
    productive_time = fields.Float(
        'Productive Time', compute='_compute_productive_time',
        help='Productive hours over the last month', digits=(16, 2))
    oee = fields.Float(compute='_compute_oee', help='Overall Equipment Effectiveness, based on the last month')
    oee_target = fields.Float(string='OEE Target', help="Overall Effective Efficiency Target in percentage", default=90)
    performance = fields.Integer('Performance', compute='_compute_performance', help='Performance over the last month')
    workcenter_load = fields.Float('Work Center Load', compute='_compute_workorder_count')
    alternative_workcenter_ids = fields.Many2many(
        'mrp.workcenter',
        'mrp_workcenter_alternative_rel',
        'workcenter_id',
        'alternative_workcenter_id',
        domain="[('id', '!=', id), '|', ('company_id', '=', company_id), ('company_id', '=', False)]",
        string="Alternative Workcenters", check_company=True,
        help="Alternative workcenters that can be substituted to this one in order to dispatch production"
    )
    tag_ids = fields.Many2many('mrp.workcenter.tag')
    capacity_ids = fields.One2many('mrp.workcenter.capacity', 'workcenter_id', string='Product Capacities',
        help="Specific number of pieces that can be produced in parallel per product.", copy=True)
    kanban_dashboard_graph = fields.Text(compute='_compute_kanban_dashboard_graph')

    @api.constrains('alternative_workcenter_ids')
    def _check_alternative_workcenter(self):
        for workcenter in self:
            if workcenter in workcenter.alternative_workcenter_ids:
                raise ValidationError(_("Workcenter %s cannot be an alternative of itself.", workcenter.name))

    def _compute_kanban_dashboard_graph(self):
        week_range, date_start, date_stop = self._get_week_range_and_first_last_days()
        load_data = self._get_workcenter_load_per_week(week_range, date_start, date_stop)
        load_graph_data = self._prepare_graph_data(load_data, week_range)
        for wc in self:
            wc.kanban_dashboard_graph = json.dumps(load_graph_data[wc.id])

    def _get_week_range_and_first_last_days(self):
        """ We calculate the delta between today and the previous monday,
        then add it to the delta between monday and the previous first day
        of the week as configured in the language settings.
        We use the result to calculate the modulo of 7 to make sure that
        we do not take the previous first day of the week from 2 weeks ago.

        E.g. today is Thursday, the first of a week is a Tuesday.
        The delta between today and Monday is 3 days.
        The delta between Monday and the previous Tuesday is 6 days.
        (3 + 6) % 7 = 2, so from today, the first day of the current week is 2 days ago.
        """
        week_range = {}
        locale = get_lang(self.env).code
        today = datetime.today()
        delta_from_monday_to_today = (today - start_of(today, 'week')).days
        first_week_day = int(get_lang(self.env).week_start) - 1
        day_offset = ((7 - first_week_day) + delta_from_monday_to_today) % 7

        for delta in range(-7, 28, 7):
            week_start = start_of(today + relativedelta.relativedelta(days=delta - day_offset), 'day')
            week_end = week_start + relativedelta.relativedelta(days=6)
            short_name = (format_date(week_start, 'd - ', locale=locale)
                          + format_date(week_end, 'd MMM', locale=locale))
            if not delta:
                short_name = _('This Week')
            week_range[week_start] = short_name
        date_start = start_of(today + relativedelta.relativedelta(days=-7 - day_offset), 'day')
        date_stop = end_of(today + relativedelta.relativedelta(days=27 - day_offset), 'day')
        return week_range, date_start, date_stop

    def _get_workcenter_load_per_week(self, week_range, date_start, date_stop):
        load_data = {rec: {} for rec in self}
        # demo data
        if not self.order_ids:
            for wc in self:
                load_limit = 40     # default max load per week is 40 hours on a new workcenter
                load_data[wc] = {week_start: randint(0, int(load_limit * 2)) for week_start in week_range}
            return load_data

        result = self.env['mrp.workorder']._read_group(
            [('workcenter_id', 'in', self.ids), ('state', 'in', ('pending', 'waiting', 'ready', 'progress')),
             ('production_date', '>=', date_start), ('production_date', '<=', date_stop)],
            ['workcenter_id', 'production_date:week'], ['duration_expected:sum'])
        for r in result:
            load_in_hours = round(r[2] / 60, 1)
            load_data[r[0]].update({r[1]: load_in_hours})
        return load_data

    def _prepare_graph_data(self, load_data, week_range):
        graph_data = {wid: [] for wid in self._ids}
        for workcenter in self:
            load_limit = sum(workcenter.resource_calendar_id.attendance_ids.mapped('duration_hours'))
            wc_data = {'is_sample_data': not self.order_ids, 'labels': list(week_range.values())}
            load_bar = []
            excess_bar = []
            for week_start in week_range:
                load_bar.append(min(load_data[workcenter].get(week_start, 0), load_limit))
                excess_bar.append(max(float_round(load_data[workcenter].get(week_start, 0) - load_limit, precision_digits=1, rounding_method='HALF-UP'), 0))
            wc_data['values'] = [load_bar, load_limit, excess_bar]
            graph_data[workcenter.id].append(wc_data)
        return graph_data

    @api.depends('order_ids.duration_expected', 'order_ids.workcenter_id', 'order_ids.state', 'order_ids.date_start')
    def _compute_workorder_count(self):
        MrpWorkorder = self.env['mrp.workorder']
        result = {wid: {} for wid in self._ids}
        result_duration_expected = {wid: 0 for wid in self._ids}
        # Count Late Workorder
        data = MrpWorkorder._read_group(
            [('workcenter_id', 'in', self.ids), ('state', 'in', ('pending', 'waiting', 'ready')), ('date_start', '<', datetime.now().strftime('%Y-%m-%d'))],
            ['workcenter_id'], ['__count'])
        count_data = {workcenter.id: count for workcenter, count in data}
        # Count All, Pending, Ready, Progress Workorder
        res = MrpWorkorder._read_group(
            [('workcenter_id', 'in', self.ids)],
            ['workcenter_id', 'state'], ['duration_expected:sum', '__count'])
        for workcenter, state, duration_sum, count in res:
            result[workcenter.id][state] = count
            if state in ('pending', 'waiting', 'ready', 'progress'):
                result_duration_expected[workcenter.id] += duration_sum
        for workcenter in self:
            workcenter.workorder_count = sum(count for state, count in result[workcenter.id].items() if state not in ('done', 'cancel'))
            workcenter.workorder_pending_count = result[workcenter.id].get('pending', 0)
            workcenter.workcenter_load = result_duration_expected[workcenter.id]
            workcenter.workorder_ready_count = result[workcenter.id].get('ready', 0)
            workcenter.workorder_progress_count = result[workcenter.id].get('progress', 0)
            workcenter.workorder_late_count = count_data.get(workcenter.id, 0)

    @api.depends('time_ids', 'time_ids.date_end', 'time_ids.loss_type')
    def _compute_working_state(self):
        for workcenter in self:
            # We search for a productivity line associated to this workcenter having no `date_end`.
            # If we do not find one, the workcenter is not currently being used. If we find one, according
            # to its `type_loss`, the workcenter is either being used or blocked.
            time_log = self.env['mrp.workcenter.productivity'].search([
                ('workcenter_id', '=', workcenter.id),
                ('date_end', '=', False)
            ], limit=1)
            if not time_log:
                # the workcenter is not being used
                workcenter.working_state = 'normal'
            elif time_log.loss_type in ('productive', 'performance'):
                # the productivity line has a `loss_type` that means the workcenter is being used
                workcenter.working_state = 'done'
            else:
                # the workcenter is blocked
                workcenter.working_state = 'blocked'

    def _compute_blocked_time(self):
        # TDE FIXME: productivity loss type should be only losses, probably count other time logs differently ??
        data = self.env['mrp.workcenter.productivity']._read_group([
            ('date_start', '>=', fields.Datetime.to_string(datetime.now() - relativedelta.relativedelta(months=1))),
            ('workcenter_id', 'in', self.ids),
            ('date_end', '!=', False),
            ('loss_type', '!=', 'productive')],
            ['workcenter_id'], ['duration:sum'])
        count_data = {workcenter.id: duration for workcenter, duration in data}
        for workcenter in self:
            workcenter.blocked_time = count_data.get(workcenter.id, 0.0) / 60.0

    def _compute_productive_time(self):
        # TDE FIXME: productivity loss type should be only losses, probably count other time logs differently
        data = self.env['mrp.workcenter.productivity']._read_group([
            ('date_start', '>=', fields.Datetime.to_string(datetime.now() - relativedelta.relativedelta(months=1))),
            ('workcenter_id', 'in', self.ids),
            ('date_end', '!=', False),
            ('loss_type', '=', 'productive')],
            ['workcenter_id'], ['duration:sum'])
        count_data = {workcenter.id: duration for workcenter, duration in data}
        for workcenter in self:
            workcenter.productive_time = count_data.get(workcenter.id, 0.0) / 60.0

    @api.depends('blocked_time', 'productive_time')
    def _compute_oee(self):
        for order in self:
            if order.productive_time:
                order.oee = round(order.productive_time * 100.0 / (order.productive_time + order.blocked_time), 2)
            else:
                order.oee = 0.0

    def _compute_performance(self):
        wo_data = self.env['mrp.workorder']._read_group([
            ('date_start', '>=', fields.Datetime.to_string(datetime.now() - relativedelta.relativedelta(months=1))),
            ('workcenter_id', 'in', self.ids),
            ('state', '=', 'done')], ['workcenter_id'], ['duration_expected:sum', 'duration:sum'])
        duration_expected = {workcenter.id: expected for workcenter, expected, __ in wo_data}
        duration = {workcenter.id: duration for workcenter, __, duration in wo_data}
        for workcenter in self:
            if duration.get(workcenter.id):
                workcenter.performance = 100 * duration_expected.get(workcenter.id, 0.0) / duration[workcenter.id]
            else:
                workcenter.performance = 0.0

    @api.depends('routing_line_ids')
    def _compute_has_routing_lines(self):
        for workcenter in self:
            workcenter.has_routing_lines = self.env['mrp.routing.workcenter'].search_count([('workcenter_id', '=', workcenter.id)], limit=1)

    @api.constrains('default_capacity')
    def _check_capacity(self):
        if any(workcenter.default_capacity <= 0.0 for workcenter in self):
            raise exceptions.UserError(_('The capacity must be strictly positive.'))

    def unblock(self):
        self.ensure_one()
        if self.working_state != 'blocked':
            raise exceptions.UserError(_("It has already been unblocked."))
        times = self.env['mrp.workcenter.productivity'].search([('workcenter_id', '=', self.id), ('date_end', '=', False)])
        times.write({'date_end': datetime.now()})
        return True

    @api.model_create_multi
    def create(self, vals_list):
        # resource_type is 'human' by default. As we are not living in
        # /r/latestagecapitalism, workcenters are 'material'
        records = super(MrpWorkcenter, self.with_context(default_resource_type='material')).create(vals_list)
        return records

    def write(self, vals):
        if 'company_id' in vals:
            self.resource_id.company_id = vals['company_id']
        return super(MrpWorkcenter, self).write(vals)

    def action_show_operations(self):
        self.ensure_one()
        action = self.env['ir.actions.actions']._for_xml_id('mrp.mrp_routing_action')
        action['domain'] = [('workcenter_id', '=', self.id)]
        action['context'] = {
            'default_workcenter_id': self.id,
        }
        return action

    def action_work_order(self):
        action = self.env["ir.actions.actions"]._for_xml_id("mrp.action_work_orders")
        return action

    def action_work_order_alternatives(self):
        action = self.env["ir.actions.actions"]._for_xml_id("mrp.mrp_workorder_todo")
        action['domain'] = ['|', ('workcenter_id', 'in', self.alternative_workcenter_ids.ids),
                            ('workcenter_id.alternative_workcenter_ids', '=', self.id)]
        return action

    def _get_unavailability_intervals(self, start_datetime, end_datetime):
        """Get the unavailabilities intervals for the workcenters in `self`.

        Return the list of unavailabilities (a tuple of datetimes) indexed
        by workcenter id.

        :param start_datetime: filter unavailability with only slots after this start_datetime
        :param end_datetime: filter unavailability with only slots before this end_datetime
        :rtype: dict
        """
        unavailability_ressources = self.resource_id._get_unavailable_intervals(start_datetime, end_datetime)
        return {wc.id: unavailability_ressources.get(wc.resource_id.id, []) for wc in self}

    def _get_first_available_slot(self, start_datetime, duration, forward=True, leaves_to_ignore=False, extra_leaves_slots=[]):
        """Get the first available interval for the workcenter in `self`.

        The available interval is disjoinct with all other workorders planned on this workcenter, but
        can overlap the time-off of the related calendar (inverse of the working hours).
        Return the first available interval (start datetime, end datetime) or,
        if there is none before 700 days, a tuple error (False, 'error message').

        :param duration: minutes needed to make the workorder (float)
        :param start_datetime: begin the search at this datetime
        :param forward: forward scheduling (search from start_datetime to 700 days after), or backward (from start_datetime to now)
        :param leaves_to_ignore: typically, ignore allocated leave when re-planning a workorder
        :param extra_leaves_slots: extra time slots (start, stop) to consider
        :rtype: tuple
        """
        self.ensure_one()
        resource = self.resource_id
        start_datetime, revert = make_aware(start_datetime)
        get_available_intervals = partial(self.resource_calendar_id._work_intervals_batch, resources=resource, tz=timezone(self.resource_calendar_id.tz))
        workorder_intervals_leaves_domain = [('time_type', '=', 'other')]
        if leaves_to_ignore:
            workorder_intervals_leaves_domain.append(('id', 'not in', leaves_to_ignore.ids))
        get_workorder_intervals = partial(self.resource_calendar_id._leave_intervals_batch, domain=workorder_intervals_leaves_domain, resources=resource, tz=timezone(self.resource_calendar_id.tz))
        extra_leaves_slots_intervals = Intervals([(make_aware(start)[0], make_aware(stop)[0], self.env['resource.calendar.attendance']) for start, stop in extra_leaves_slots])

        remaining = duration
        now = make_aware(datetime.now())[0]
        delta = timedelta(days=14)
        start_interval, stop_interval = None, None
        for n in range(50):  # 50 * 14 = 700 days in advance (hardcoded)
            if forward:
                date_start = start_datetime + delta * n
                date_stop = date_start + delta
                available_intervals = get_available_intervals(date_start, date_stop)[resource.id]
                workorder_intervals = get_workorder_intervals(date_start, date_stop)[resource.id]
                for start, stop, _records in available_intervals:
                    start_interval = start_interval or start
                    interval_minutes = (stop - start).total_seconds() / 60
                    while (interval := Intervals([(start_interval or start, start + timedelta(minutes=min(remaining, interval_minutes)), _records)])) \
                      and (conflict := interval & workorder_intervals or interval & extra_leaves_slots_intervals):
                        (_start, start, _records) = conflict._items[0]  # restart available interval at conflicting interval stop
                        interval_minutes = (stop - start).total_seconds() / 60
                        start_interval, remaining = start if interval_minutes else None, duration
                    if float_compare(interval_minutes, remaining, precision_digits=3) >= 0:
                        return revert(start_interval), revert(start + timedelta(minutes=remaining))
                    remaining -= interval_minutes
            else:
                # same process but starting from end on reversed intervals
                date_stop = start_datetime - delta * n
                date_start = date_stop - delta
                available_intervals = get_available_intervals(date_start, date_stop)[resource.id]
                available_intervals = reversed(available_intervals)
                workorder_intervals = get_workorder_intervals(date_start, date_stop)[resource.id]
                for start, stop, _records in available_intervals:
                    stop_interval = stop_interval or stop
                    interval_minutes = (stop - start).total_seconds() / 60
                    while (interval := Intervals([(stop - timedelta(minutes=min(remaining, interval_minutes)), stop_interval or stop, _records)])) \
                      and (conflict := interval & workorder_intervals or interval & extra_leaves_slots_intervals):
                        (stop, _stop, _records) = conflict._items[0]  # restart available interval at conflicting interval start
                        interval_minutes = (stop - start).total_seconds() / 60
                        stop_interval, remaining = stop if interval_minutes else None, duration
                    if float_compare(interval_minutes, remaining, precision_digits=3) >= 0:
                        return revert(stop - timedelta(minutes=remaining)), revert(stop_interval)
                    remaining -= interval_minutes
                if date_start <= now:
                    break
        return False, 'No available slot 700 days after the planned start'

    def action_archive(self):
        res = super().action_archive()
        filtered_workcenters = ", ".join(workcenter.name for workcenter in self.filtered('routing_line_ids'))
        if filtered_workcenters:
            return {
                'type': 'ir.actions.client',
                'tag': 'display_notification',
                'params': {
                'title': _("Note that archived work center(s): '%s' is/are still linked to active Bill of Materials, which means that operations can still be planned on it/them. "
                           "To prevent this, deletion of the work center is recommended instead.", filtered_workcenters),
                'type': 'warning',
                'sticky': True,  #True/False will display for few seconds if false
                'next': {'type': 'ir.actions.act_window_close'},
                },
            }
        return res

    def _get_capacity(self, product):
        product_capacity = self.capacity_ids.filtered(lambda capacity: capacity.product_id == product)
        return product_capacity.capacity if product_capacity else self.default_capacity

    def _get_expected_duration(self, product_id):
        """Compute the expected duration when using this work-center
        Always use the startup / clean-up time from specific capacity if defined.
        """
        capacity = self.capacity_ids.filtered(lambda p: p.product_id == product_id)
        return capacity.time_start + capacity.time_stop if capacity else self.time_start + self.time_stop


class WorkcenterTag(models.Model):
    _name = 'mrp.workcenter.tag'
    _description = 'Add tag for the workcenter'
    _order = 'name'

    def _get_default_color(self):
        return randint(1, 11)

    name = fields.Char("Tag Name", required=True)
    color = fields.Integer("Color Index", default=_get_default_color)

    _sql_constraints = [
        ('tag_name_unique', 'unique(name)',
         'The tag name must be unique.'),
    ]


class MrpWorkcenterProductivityLossType(models.Model):
    _name = "mrp.workcenter.productivity.loss.type"
    _description = 'MRP Workorder productivity losses'
    _rec_name = 'loss_type'

    def _compute_display_name(self):
        """ As 'category' field in form view is a Many2one, its value will be in
        lower case. In order to display its value capitalized 'display_name' is
        overrided.
        """
        for rec in self:
            rec.display_name = rec.loss_type.title()

    loss_type = fields.Selection([
            ('availability', 'Availability'),
            ('performance', 'Performance'),
            ('quality', 'Quality'),
            ('productive', 'Productive')], string='Category', default='availability', required=True)


class MrpWorkcenterProductivityLoss(models.Model):
    _name = "mrp.workcenter.productivity.loss"
    _description = "Workcenter Productivity Losses"
    _order = "sequence, id"

    name = fields.Char('Blocking Reason', required=True, translate=True)
    sequence = fields.Integer('Sequence', default=1)
    manual = fields.Boolean('Is a Blocking Reason', default=True)
    loss_id = fields.Many2one('mrp.workcenter.productivity.loss.type', domain=[('loss_type', 'in', ['quality', 'availability'])], string='Category')
    loss_type = fields.Selection(string='Effectiveness Category', related='loss_id.loss_type', store=True, readonly=False)

    def _convert_to_duration(self, date_start, date_stop, workcenter=False):
        """ Convert a date range into a duration in minutes.
        If the productivity type is not from an employee (extra hours are allow)
        and the workcenter has a calendar, convert the dates into a duration based on
        working hours.
        """
        duration = 0
        for productivity_loss in self:
            if (productivity_loss.loss_type not in ('productive', 'performance')) and workcenter and workcenter.resource_calendar_id:
                r = workcenter._get_work_days_data_batch(date_start, date_stop)[workcenter.id]['hours']
                duration = max(duration, r * 60)
            else:
                duration = max(duration, (date_stop - date_start).total_seconds() / 60.0)
        return round(duration, 2)

class MrpWorkcenterProductivity(models.Model):
    _name = "mrp.workcenter.productivity"
    _description = "Workcenter Productivity Log"
    _order = "id desc"
    _rec_name = "loss_id"
    _check_company_auto = True

    def _get_default_company_id(self):
        company_id = False
        if self.env.context.get('default_company_id'):
            company_id = self.env.context['default_company_id']
        if not company_id and self.env.context.get('default_workorder_id'):
            workorder = self.env['mrp.workorder'].browse(self.env.context['default_workorder_id'])
            company_id = workorder.company_id
        if not company_id and self.env.context.get('default_workcenter_id'):
            workcenter = self.env['mrp.workcenter'].browse(self.env.context['default_workcenter_id'])
            company_id = workcenter.company_id
        if not company_id:
            company_id = self.env.company
        return company_id

    production_id = fields.Many2one('mrp.production', string='Manufacturing Order', related='workorder_id.production_id', readonly=True)
    workcenter_id = fields.Many2one('mrp.workcenter', "Work Center", required=True, check_company=True, index=True)
    company_id = fields.Many2one(
        'res.company', required=True, index=True,
        default=lambda self: self._get_default_company_id())
    workorder_id = fields.Many2one('mrp.workorder', 'Work Order', check_company=True, index=True)
    user_id = fields.Many2one(
        'res.users', "User",
        default=lambda self: self.env.uid)
    loss_id = fields.Many2one(
        'mrp.workcenter.productivity.loss', "Loss Reason",
        ondelete='restrict', required=True)
    loss_type = fields.Selection(
        string="Effectiveness", related='loss_id.loss_type', store=True, readonly=False)
    description = fields.Text('Description')
    date_start = fields.Datetime('Start Date', default=fields.Datetime.now, required=True)
    date_end = fields.Datetime('End Date')
    duration = fields.Float('Duration', compute='_compute_duration', store=True)

    @api.depends('date_end', 'date_start')
    def _compute_duration(self):
        for blocktime in self:
            if blocktime.date_start and blocktime.date_end:
                blocktime.duration = blocktime.loss_id._convert_to_duration(blocktime.date_start.replace(microsecond=0), blocktime.date_end.replace(microsecond=0), blocktime.workcenter_id)
            else:
                blocktime.duration = 0.0

    @api.onchange('duration')
    def _duration_changed(self):
        self.date_start = self.date_end - timedelta(minutes=self.duration)
        self._loss_type_change()

    @api.onchange('date_start')
    def _date_start_changed(self):
        if not self.date_start:
            return
        self.date_end = self.date_start + timedelta(minutes=self.duration)
        self._loss_type_change()

    @api.onchange('date_end')
    def _date_end_changed(self):
        if not self.date_end:
            return
        self.date_start = self.date_end - timedelta(minutes=self.duration)
        self._loss_type_change()

    @api.constrains('workorder_id')
    def _check_open_time_ids(self):
        for workorder in self.workorder_id:
            open_time_ids_by_user = self.env["mrp.workcenter.productivity"]._read_group(
                [("id", "in", workorder.time_ids.ids), ("date_end", "=", False)],
                ["user_id"], having=[("__count", ">", 1)],
            )
            if open_time_ids_by_user:
                raise ValidationError(_('The Workorder (%s) cannot be started twice!', workorder.display_name))

    def button_block(self):
        self.ensure_one()
        self.workcenter_id.order_ids.end_all()

    def _loss_type_change(self):
        self.ensure_one()
        if self.workorder_id.duration > self.workorder_id.duration_expected:
            self.loss_id = self.env.ref("mrp.block_reason4").id
        else:
            self.loss_id = self.env.ref("mrp.block_reason7").id

    def _close(self):
        underperformance_timers = self.env['mrp.workcenter.productivity']
        for timer in self:
            wo = timer.workorder_id
            timer.write({'date_end': fields.Datetime.now()})
            if wo.duration > wo.duration_expected:
                productive_date_end = timer.date_end - relativedelta.relativedelta(minutes=wo.duration - wo.duration_expected)
                if productive_date_end <= timer.date_start:
                    underperformance_timers |= timer
                else:
                    underperformance_timers |= timer.copy({'date_start': productive_date_end})
                    timer.write({'date_end': productive_date_end})
        if underperformance_timers:
            underperformance_type = self.env['mrp.workcenter.productivity.loss'].search([('loss_type', '=', 'performance')], limit=1)
            if not underperformance_type:
                raise UserError(_("You need to define at least one unactive productivity loss in the category 'Performance'. Create one from the Manufacturing app, menu: Configuration / Productivity Losses."))
            underperformance_timers.write({'loss_id': underperformance_type.id})


class MrpWorkCenterCapacity(models.Model):
    _name = 'mrp.workcenter.capacity'
    _description = 'Work Center Capacity'
    _check_company_auto = True

    def _default_time_start(self):
        workcenter_id = self.workcenter_id.id or self.env.context.get('default_workcenter_id')
        return self.env['mrp.workcenter'].browse(workcenter_id).time_start if workcenter_id else 0.0

    def _default_time_stop(self):
        workcenter_id = self.workcenter_id.id or self.env.context.get('default_workcenter_id')
        return self.env['mrp.workcenter'].browse(workcenter_id).time_stop if workcenter_id else 0.0

    workcenter_id = fields.Many2one('mrp.workcenter', string='Work Center', required=True)
    product_id = fields.Many2one('product.product', string='Product', required=True)
    product_uom_id = fields.Many2one('uom.uom', string='Product UoM', related='product_id.uom_id')
    capacity = fields.Float('Capacity', default=1.0, help="Number of pieces that can be produced in parallel for this product.")
    time_start = fields.Float('Setup Time (minutes)', default=_default_time_start, help="Time in minutes for the setup.")
    time_stop = fields.Float('Cleanup Time (minutes)', default=_default_time_stop, help="Time in minutes for the cleaning.")

    _sql_constraints = [
        ('positive_capacity', 'CHECK(capacity > 0)', 'Capacity should be a positive number.'),
        ('unique_product', 'UNIQUE(workcenter_id, product_id)', 'Product capacity should be unique for each workcenter.'),
    ]