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

from collections import namedtuple
import json
import time
from datetime import date

from itertools import groupby
from odoo import api, fields, models, _
from odoo.osv import expression
from odoo.tools import DEFAULT_SERVER_DATETIME_FORMAT
from odoo.tools.float_utils import float_compare, float_is_zero, float_round
from odoo.exceptions import UserError
from odoo.addons.stock.models.stock_move import PROCUREMENT_PRIORITIES
from operator import itemgetter


class PickingType(models.Model):
    _name = "stock.picking.type"
    _description = "Picking Type"
    _order = 'sequence, id'

    name = fields.Char('Operation Type', required=True, translate=True)
    color = fields.Integer('Color')
    sequence = fields.Integer('Sequence', help="Used to order the 'All Operations' kanban view")
    sequence_id = fields.Many2one('ir.sequence', 'Reference Sequence', required=True)
    default_location_src_id = fields.Many2one(
        'stock.location', 'Default Source Location',
        help="This is the default source location when you create a picking manually with this operation type. It is possible however to change it or that the routes put another location. If it is empty, it will check for the supplier location on the partner. ")
    default_location_dest_id = fields.Many2one(
        'stock.location', 'Default Destination Location',
        help="This is the default destination location when you create a picking manually with this operation type. It is possible however to change it or that the routes put another location. If it is empty, it will check for the customer location on the partner. ")
    code = fields.Selection([('incoming', 'Vendors'), ('outgoing', 'Customers'), ('internal', 'Internal')], 'Type of Operation', required=True)
    return_picking_type_id = fields.Many2one('stock.picking.type', 'Operation Type for Returns')
    show_entire_packs = fields.Boolean('Move Entire Packages', help="If ticked, you will be able to select entire packages to move")
    warehouse_id = fields.Many2one(
        'stock.warehouse', 'Warehouse', ondelete='cascade',
        default=lambda self: self.env['stock.warehouse'].search([('company_id', '=', self.env.user.company_id.id)], limit=1))
    active = fields.Boolean('Active', default=True)
    use_create_lots = fields.Boolean(
        'Create New Lots/Serial Numbers', default=True,
        help="If this is checked only, it will suppose you want to create new Lots/Serial Numbers, so you can provide them in a text field. ")
    use_existing_lots = fields.Boolean(
        'Use Existing Lots/Serial Numbers', default=True,
        help="If this is checked, you will be able to choose the Lots/Serial Numbers. You can also decide to not put lots in this operation type.  This means it will create stock with no lot or not put a restriction on the lot taken. ")
    show_operations = fields.Boolean(
        'Show Detailed Operations', default=False,
        help="If this checkbox is ticked, the pickings lines will represent detailed stock operations. If not, the picking lines will represent an aggregate of detailed stock operations.")
    show_reserved = fields.Boolean(
        'Show Reserved', default=True, help="If this checkbox is ticked, Odoo will show which products are reserved (lot/serial number, source location, source package).")

    # Statistics for the kanban view
    last_done_picking = fields.Char('Last 10 Done Pickings', compute='_compute_last_done_picking')
    count_picking_draft = fields.Integer(compute='_compute_picking_count')
    count_picking_ready = fields.Integer(compute='_compute_picking_count')
    count_picking = fields.Integer(compute='_compute_picking_count')
    count_picking_waiting = fields.Integer(compute='_compute_picking_count')
    count_picking_late = fields.Integer(compute='_compute_picking_count')
    count_picking_backorders = fields.Integer(compute='_compute_picking_count')
    rate_picking_late = fields.Integer(compute='_compute_picking_count')
    rate_picking_backorders = fields.Integer(compute='_compute_picking_count')
    barcode = fields.Char('Barcode', copy=False)

    @api.one
    def _compute_last_done_picking(self):
        # TDE TODO: true multi
        tristates = []
        for picking in self.env['stock.picking'].search([('picking_type_id', '=', self.id), ('state', '=', 'done')], order='date_done desc', limit=10):
            if picking.date_done > picking.date:
                tristates.insert(0, {'tooltip': picking.name or '' + ": " + _('Late'), 'value': -1})
            elif picking.backorder_id:
                tristates.insert(0, {'tooltip': picking.name or '' + ": " + _('Backorder exists'), 'value': 0})
            else:
                tristates.insert(0, {'tooltip': picking.name or '' + ": " + _('OK'), 'value': 1})
        self.last_done_picking = json.dumps(tristates)

    def _compute_picking_count(self):
        # TDE TODO count picking can be done using previous two
        domains = {
            'count_picking_draft': [('state', '=', 'draft')],
            'count_picking_waiting': [('state', 'in', ('confirmed', 'waiting'))],
            'count_picking_ready': [('state', '=', 'assigned')],
            'count_picking': [('state', 'in', ('assigned', 'waiting', 'confirmed'))],
            'count_picking_late': [('scheduled_date', '<', time.strftime(DEFAULT_SERVER_DATETIME_FORMAT)), ('state', 'in', ('assigned', 'waiting', 'confirmed'))],
            'count_picking_backorders': [('backorder_id', '!=', False), ('state', 'in', ('confirmed', 'assigned', 'waiting'))],
        }
        for field in domains:
            data = self.env['stock.picking'].read_group(domains[field] +
                [('state', 'not in', ('done', 'cancel')), ('picking_type_id', 'in', self.ids)],
                ['picking_type_id'], ['picking_type_id'])
            count = {
                x['picking_type_id'][0]: x['picking_type_id_count']
                for x in data if x['picking_type_id']
            }
            for record in self:
                record[field] = count.get(record.id, 0)
        for record in self:
            record.rate_picking_late = record.count_picking and record.count_picking_late * 100 / record.count_picking or 0
            record.rate_picking_backorders = record.count_picking and record.count_picking_backorders * 100 / record.count_picking or 0

    def name_get(self):
        """ Display 'Warehouse_name: PickingType_name' """
        # TDE TODO remove context key support + update purchase
        res = []
        for picking_type in self:
            if self.env.context.get('special_shortened_wh_name'):
                if picking_type.warehouse_id:
                    name = picking_type.warehouse_id.name
                else:
                    name = _('Customer') + ' (' + picking_type.name + ')'
            elif picking_type.warehouse_id:
                name = picking_type.warehouse_id.name + ': ' + picking_type.name
            else:
                name = picking_type.name
            res.append((picking_type.id, name))
        return res

    @api.model
    def _name_search(self, name, args=None, operator='ilike', limit=100, name_get_uid=None):
        args = args or []
        domain = []
        if name:
            domain = ['|', ('name', operator, name), ('warehouse_id.name', operator, name)]
        picking_ids = self._search(expression.AND([domain, args]), limit=limit, access_rights_uid=name_get_uid)
        return self.browse(picking_ids).name_get()

    @api.onchange('code')
    def onchange_picking_code(self):
        if self.code == 'incoming':
            self.default_location_src_id = self.env.ref('stock.stock_location_suppliers').id
            self.default_location_dest_id = self.env.ref('stock.stock_location_stock').id
        elif self.code == 'outgoing':
            self.default_location_src_id = self.env.ref('stock.stock_location_stock').id
            self.default_location_dest_id = self.env.ref('stock.stock_location_customers').id

    @api.onchange('show_operations')
    def onchange_show_operations(self):
        if self.show_operations is True:
            self.show_reserved = True

    def _get_action(self, action_xmlid):
        # TDE TODO check to have one view + custo in methods
        action = self.env.ref(action_xmlid).read()[0]
        if self:
            action['display_name'] = self.display_name
        return action

    def get_action_picking_tree_late(self):
        return self._get_action('stock.action_picking_tree_late')

    def get_action_picking_tree_backorder(self):
        return self._get_action('stock.action_picking_tree_backorder')

    def get_action_picking_tree_waiting(self):
        return self._get_action('stock.action_picking_tree_waiting')

    def get_action_picking_tree_ready(self):
        return self._get_action('stock.action_picking_tree_ready')

    def get_stock_picking_action_picking_type(self):
        return self._get_action('stock.stock_picking_action_picking_type')


class Picking(models.Model):
    _name = "stock.picking"
    _inherit = ['mail.thread', 'mail.activity.mixin']
    _description = "Transfer"
    _order = "priority desc, date asc, id desc"

    name = fields.Char(
        'Reference', default='/',
        copy=False,  index=True,
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]})
    origin = fields.Char(
        'Source Document', index=True,
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]},
        help="Reference of the document")
    note = fields.Text('Notes')

    backorder_id = fields.Many2one(
        'stock.picking', 'Back Order of',
        copy=False, index=True,
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]},
        help="If this shipment was split, then this field links to the shipment which contains the already processed part.")

    backorder_ids = fields.One2many('stock.picking', 'backorder_id', 'Back Orders')

    move_type = fields.Selection([
        ('direct', 'As soon as possible'), ('one', 'When all products are ready')], 'Shipping Policy',
        default='direct', required=True,
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]},
        help="It specifies goods to be deliver partially or all at once")

    state = fields.Selection([
        ('draft', 'Draft'),
        ('waiting', 'Waiting Another Operation'),
        ('confirmed', 'Waiting'),
        ('assigned', 'Ready'),
        ('done', 'Done'),
        ('cancel', 'Cancelled'),
    ], string='Status', compute='_compute_state',
        copy=False, index=True, readonly=True, store=True, track_visibility='onchange',
        help=" * Draft: not confirmed yet and will not be scheduled until confirmed.\n"
             " * Waiting Another Operation: waiting for another move to proceed before it becomes automatically available (e.g. in Make-To-Order flows).\n"
             " * Waiting: if it is not ready to be sent because the required products could not be reserved.\n"
             " * Ready: products are reserved and ready to be sent. If the shipping policy is 'As soon as possible' this happens as soon as anything is reserved.\n"
             " * Done: has been processed, can't be modified or cancelled anymore.\n"
             " * Cancelled: has been cancelled, can't be confirmed anymore.")

    group_id = fields.Many2one(
        'procurement.group', 'Procurement Group',
        readonly=True, related='move_lines.group_id', store=True)

    priority = fields.Selection(
        PROCUREMENT_PRIORITIES, string='Priority',
        compute='_compute_priority', inverse='_set_priority', store=True,
        # default='1', required=True,  # TDE: required, depending on moves ? strange
        index=True, track_visibility='onchange',
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]},
        help="Priority for this picking. Setting manually a value here would set it as priority for all the moves")
    scheduled_date = fields.Datetime(
        'Scheduled Date', compute='_compute_scheduled_date', inverse='_set_scheduled_date', store=True,
        index=True, track_visibility='onchange',
        help="Scheduled time for the first part of the shipment to be processed. Setting manually a value here would set it as expected date for all the stock moves.")
    date = fields.Datetime(
        'Creation Date',
        default=fields.Datetime.now, index=True, track_visibility='onchange',
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]},
        help="Creation Date, usually the time of the order")
    date_done = fields.Datetime('Date of Transfer', copy=False, readonly=True, help="Date at which the transfer has been processed or cancelled.")

    location_id = fields.Many2one(
        'stock.location', "Source Location",
        default=lambda self: self.env['stock.picking.type'].browse(self._context.get('default_picking_type_id')).default_location_src_id,
        readonly=True, required=True,
        states={'draft': [('readonly', False)]})
    location_dest_id = fields.Many2one(
        'stock.location', "Destination Location",
        default=lambda self: self.env['stock.picking.type'].browse(self._context.get('default_picking_type_id')).default_location_dest_id,
        readonly=True, required=True,
        states={'draft': [('readonly', False)]})
    move_lines = fields.One2many('stock.move', 'picking_id', string="Stock Moves", copy=True)
    move_ids_without_package = fields.One2many('stock.move', 'picking_id', string="Stock moves not in package", domain=['|',('package_level_id', '=', False), ('picking_type_entire_packs', '=', False)])
    has_scrap_move = fields.Boolean(
        'Has Scrap Moves', compute='_has_scrap_move')
    picking_type_id = fields.Many2one(
        'stock.picking.type', 'Operation Type',
        required=True,
        readonly=True,
        states={'draft': [('readonly', False)]})
    picking_type_code = fields.Selection([
        ('incoming', 'Vendors'),
        ('outgoing', 'Customers'),
        ('internal', 'Internal')], related='picking_type_id.code',
        readonly=True)
    picking_type_entire_packs = fields.Boolean(related='picking_type_id.show_entire_packs',
        readonly=True)

    partner_id = fields.Many2one(
        'res.partner', 'Partner',
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]})
    company_id = fields.Many2one(
        'res.company', 'Company',
        default=lambda self: self.env['res.company']._company_default_get('stock.picking'),
        index=True, required=True,
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]})

    move_line_ids = fields.One2many('stock.move.line', 'picking_id', 'Operations')
    move_line_ids_without_package = fields.One2many('stock.move.line', 'picking_id', 'Operations without package', domain=['|',('package_level_id', '=', False), ('picking_type_entire_packs', '=', False)])

    move_line_exist = fields.Boolean(
        'Has Pack Operations', compute='_compute_move_line_exist',
        help='Check the existence of pack operation on the picking')

    has_packages = fields.Boolean(
        'Has Packages', compute='_compute_has_packages',
        help='Check the existence of destination packages on move lines')

    show_check_availability = fields.Boolean(
        compute='_compute_show_check_availability',
        help='Technical field used to compute whether the check availability button should be shown.')
    show_mark_as_todo = fields.Boolean(
        compute='_compute_show_mark_as_todo',
        help='Technical field used to compute whether the mark as todo button should be shown.')
    show_validate = fields.Boolean(
        compute='_compute_show_validate',
        help='Technical field used to compute whether the validate should be shown.')

    owner_id = fields.Many2one(
        'res.partner', 'Owner',
        states={'done': [('readonly', True)], 'cancel': [('readonly', True)]},
        help="Default Owner")
    printed = fields.Boolean('Printed')
    is_locked = fields.Boolean(default=True, help='When the picking is not done this allows changing the '
                               'initial demand. When the picking is done this allows '
                               'changing the done quantities.')
    # Used to search on pickings
    product_id = fields.Many2one('product.product', 'Product', related='move_lines.product_id', readonly=False)
    show_operations = fields.Boolean(compute='_compute_show_operations')
    show_lots_text = fields.Boolean(compute='_compute_show_lots_text')
    has_tracking = fields.Boolean(compute='_compute_has_tracking')
    immediate_transfer = fields.Boolean(default=False)
    package_level_ids = fields.One2many('stock.package_level', 'picking_id')
    package_level_ids_details = fields.One2many('stock.package_level', 'picking_id')

    _sql_constraints = [
        ('name_uniq', 'unique(name, company_id)', 'Reference must be unique per company!'),
    ]

    def _compute_has_tracking(self):
        for picking in self:
            picking.has_tracking = any(m.has_tracking != 'none' for m in picking.move_lines)

    @api.depends('picking_type_id.show_operations')
    def _compute_show_operations(self):
        for picking in self:
            if self.env.context.get('force_detailed_view'):
                picking.show_operations = True
                continue
            if picking.picking_type_id.show_operations:
                if (picking.state == 'draft' and picking.immediate_transfer) or picking.state != 'draft':
                    picking.show_operations = True
                else:
                    picking.show_operations = False
            else:
                picking.show_operations = False

    @api.depends('move_line_ids', 'picking_type_id.use_create_lots', 'picking_type_id.use_existing_lots', 'state')
    def _compute_show_lots_text(self):
        group_production_lot_enabled = self.user_has_groups('stock.group_production_lot')
        for picking in self:
            if not picking.move_line_ids:
                picking.show_lots_text = False
            elif group_production_lot_enabled and picking.picking_type_id.use_create_lots \
                    and not picking.picking_type_id.use_existing_lots and picking.state != 'done':
                picking.show_lots_text = True
            else:
                picking.show_lots_text = False

    @api.depends('move_type', 'move_lines.state', 'move_lines.picking_id')
    @api.one
    def _compute_state(self):
        ''' State of a picking depends on the state of its related stock.move
        - Draft: only used for "planned pickings"
        - Waiting: if the picking is not ready to be sent so if
          - (a) no quantity could be reserved at all or if
          - (b) some quantities could be reserved and the shipping policy is "deliver all at once"
        - Waiting another move: if the picking is waiting for another move
        - Ready: if the picking is ready to be sent so if:
          - (a) all quantities are reserved or if
          - (b) some quantities could be reserved and the shipping policy is "as soon as possible"
        - Done: if the picking is done.
        - Cancelled: if the picking is cancelled
        '''
        if not self.move_lines:
            self.state = 'draft'
        elif any(move.state == 'draft' for move in self.move_lines):  # TDE FIXME: should be all ?
            self.state = 'draft'
        elif all(move.state == 'cancel' for move in self.move_lines):
            self.state = 'cancel'
        elif all(move.state in ['cancel', 'done'] for move in self.move_lines):
            self.state = 'done'
        else:
            relevant_move_state = self.move_lines._get_relevant_state_among_moves()
            if relevant_move_state == 'partially_available':
                self.state = 'assigned'
            else:
                self.state = relevant_move_state

    @api.one
    @api.depends('move_lines.priority')
    def _compute_priority(self):
        if self.mapped('move_lines'):
            priorities = [priority for priority in self.mapped('move_lines.priority') if priority] or ['1']
            self.priority = max(priorities)
        else:
            self.priority = '1'

    @api.one
    def _set_priority(self):
        self.move_lines.write({'priority': self.priority})

    @api.one
    @api.depends('move_lines.date_expected')
    def _compute_scheduled_date(self):
        if self.move_type == 'direct':
            self.scheduled_date = min(self.move_lines.mapped('date_expected') or [fields.Datetime.now()])
        else:
            self.scheduled_date = max(self.move_lines.mapped('date_expected') or [fields.Datetime.now()])

    @api.one
    def _set_scheduled_date(self):
        self.move_lines.write({'date_expected': self.scheduled_date})

    @api.one
    def _has_scrap_move(self):
        # TDE FIXME: better implementation
        self.has_scrap_move = bool(self.env['stock.move'].search_count([('picking_id', '=', self.id), ('scrapped', '=', True)]))

    @api.one
    def _compute_move_line_exist(self):
        self.move_line_exist = bool(self.move_line_ids)

    @api.one
    def _compute_has_packages(self):
        self.has_packages = self.move_line_ids.filtered(lambda ml: ml.result_package_id)

    @api.multi
    def _compute_show_check_availability(self):
        for picking in self:
            has_moves_to_reserve = any(
                move.state in ('waiting', 'confirmed', 'partially_available') and
                float_compare(move.product_uom_qty, 0, precision_rounding=move.product_uom.rounding)
                for move in picking.move_lines
            )
            picking.show_check_availability = picking.is_locked and picking.state in ('confirmed', 'waiting', 'assigned') and has_moves_to_reserve

    @api.multi
    @api.depends('state', 'move_lines')
    def _compute_show_mark_as_todo(self):
        for picking in self:
            if not picking.move_lines and not picking.package_level_ids:
                picking.show_mark_as_todo = False
            elif not (picking.immediate_transfer) and picking.state == 'draft':
                picking.show_mark_as_todo = True
            elif picking.state != 'draft' or not picking.id:
                picking.show_mark_as_todo = False
            else:
                picking.show_mark_as_todo = True

    @api.multi
    @api.depends('state', 'is_locked')
    def _compute_show_validate(self):
        for picking in self:
            if not (picking.immediate_transfer) and picking.state == 'draft':
                picking.show_validate = False
            elif picking.state not in ('draft', 'waiting', 'confirmed', 'assigned') or not picking.is_locked:
                picking.show_validate = False
            else:
                picking.show_validate = True

    @api.onchange('picking_type_id', 'partner_id')
    def onchange_picking_type(self):
        if self.picking_type_id:
            if self.picking_type_id.default_location_src_id:
                location_id = self.picking_type_id.default_location_src_id.id
            elif self.partner_id:
                location_id = self.partner_id.property_stock_supplier.id
            else:
                customerloc, location_id = self.env['stock.warehouse']._get_partner_locations()

            if self.picking_type_id.default_location_dest_id:
                location_dest_id = self.picking_type_id.default_location_dest_id.id
            elif self.partner_id:
                location_dest_id = self.partner_id.property_stock_customer.id
            else:
                location_dest_id, supplierloc = self.env['stock.warehouse']._get_partner_locations()

            if self.state == 'draft':
                self.location_id = location_id
                self.location_dest_id = location_dest_id
        # TDE CLEANME move into onchange_partner_id
        if self.partner_id and self.partner_id.picking_warn:
            if self.partner_id.picking_warn == 'no-message' and self.partner_id.parent_id:
                partner = self.partner_id.parent_id
            elif self.partner_id.picking_warn not in ('no-message', 'block') and self.partner_id.parent_id.picking_warn == 'block':
                partner = self.partner_id.parent_id
            else:
                partner = self.partner_id
            if partner.picking_warn != 'no-message':
                if partner.picking_warn == 'block':
                    self.partner_id = False
                return {'warning': {
                    'title': ("Warning for %s") % partner.name,
                    'message': partner.picking_warn_msg
                }}

    @api.model
    def create(self, vals):
        # TDE FIXME: clean that brol
        defaults = self.default_get(['name', 'picking_type_id'])
        if vals.get('name', '/') == '/' and defaults.get('name', '/') == '/' and vals.get('picking_type_id', defaults.get('picking_type_id')):
            vals['name'] = self.env['stock.picking.type'].browse(vals.get('picking_type_id', defaults.get('picking_type_id'))).sequence_id.next_by_id()

        # TDE FIXME: what ?
        # As the on_change in one2many list is WIP, we will overwrite the locations on the stock moves here
        # As it is a create the format will be a list of (0, 0, dict)
        if vals.get('move_lines') and vals.get('location_id') and vals.get('location_dest_id'):
            for move in vals['move_lines']:
                if len(move) == 3 and move[0] == 0:
                    move[2]['location_id'] = vals['location_id']
                    move[2]['location_dest_id'] = vals['location_dest_id']
        res = super(Picking, self).create(vals)
        res._autoconfirm_picking()
        return res

    @api.multi
    def write(self, vals):
        res = super(Picking, self).write(vals)
        # Change locations of moves if those of the picking change
        after_vals = {}
        if vals.get('location_id'):
            after_vals['location_id'] = vals['location_id']
        if vals.get('location_dest_id'):
            after_vals['location_dest_id'] = vals['location_dest_id']
        if after_vals:
            self.mapped('move_lines').filtered(lambda move: not move.scrapped).write(after_vals)
        if vals.get('move_lines'):
            # Do not run autoconfirm if any of the moves has an initial demand. If an initial demand
            # is present in any of the moves, it means the picking was created through the "planned
            # transfer" mechanism.
            pickings_to_not_autoconfirm = self.env['stock.picking']
            for picking in self:
                if picking.state != 'draft':
                    continue
                for move in picking.move_lines:
                    if not float_is_zero(move.product_uom_qty, precision_rounding=move.product_uom.rounding):
                        pickings_to_not_autoconfirm |= picking
                        break
            (self - pickings_to_not_autoconfirm)._autoconfirm_picking()
        return res

    @api.multi
    def unlink(self):
        self.mapped('move_lines')._action_cancel()
        self.mapped('move_lines').unlink() # Checks if moves are not done
        return super(Picking, self).unlink()

    # Actions
    # ----------------------------------------

    @api.one
    def action_assign_owner(self):
        self.move_line_ids.write({'owner_id': self.owner_id.id})

    def action_assign_partner(self):
        for picking in self:
            picking.move_lines.write({'partner_id': picking.partner_id.id})

    @api.multi
    def do_print_picking(self):
        self.write({'printed': True})
        return self.env.ref('stock.action_report_picking').report_action(self)

    @api.multi
    def action_confirm(self):
        self.mapped('package_level_ids').filtered(lambda pl: pl.state == 'draft' and not pl.move_ids)._generate_moves()
        # call `_action_confirm` on every draft move
        self.mapped('move_lines')\
            .filtered(lambda move: move.state == 'draft')\
            ._action_confirm()
        # call `_action_assign` on every confirmed move which location_id bypasses the reservation
        self.filtered(lambda picking: picking.location_id.usage in ('supplier', 'inventory', 'production') and picking.state == 'confirmed')\
            .mapped('move_lines')._action_assign()
        return True

    @api.multi
    def action_assign(self):
        """ Check availability of picking moves.
        This has the effect of changing the state and reserve quants on available moves, and may
        also impact the state of the picking as it is computed based on move's states.
        @return: True
        """
        self.filtered(lambda picking: picking.state == 'draft').action_confirm()
        moves = self.mapped('move_lines').filtered(lambda move: move.state not in ('draft', 'cancel', 'done'))
        if not moves:
            raise UserError(_('Nothing to check the availability for.'))
        # If a package level is done when confirmed its location can be different than where it will be reserved.
        # So we remove the move lines created when confirmed to set quantity done to the new reserved ones.
        package_level_done = self.mapped('package_level_ids').filtered(lambda pl: pl.is_done and pl.state == 'confirmed')
        package_level_done.write({'is_done': False})
        moves._action_assign()
        package_level_done.write({'is_done': True})
        return True

    @api.multi
    def action_cancel(self):
        self.mapped('move_lines')._action_cancel()
        self.write({'is_locked': True})
        return True

    @api.multi
    def action_done(self):
        """Changes picking state to done by processing the Stock Moves of the Picking

        Normally that happens when the button "Done" is pressed on a Picking view.
        @return: True
        """
        # TDE FIXME: remove decorator when migration the remaining
        todo_moves = self.mapped('move_lines').filtered(lambda self: self.state in ['draft', 'waiting', 'partially_available', 'assigned', 'confirmed'])
        # Check if there are ops not linked to moves yet
        for pick in self:
            # # Explode manually added packages
            # for ops in pick.move_line_ids.filtered(lambda x: not x.move_id and not x.product_id):
            #     for quant in ops.package_id.quant_ids: #Or use get_content for multiple levels
            #         self.move_line_ids.create({'product_id': quant.product_id.id,
            #                                    'package_id': quant.package_id.id,
            #                                    'result_package_id': ops.result_package_id,
            #                                    'lot_id': quant.lot_id.id,
            #                                    'owner_id': quant.owner_id.id,
            #                                    'product_uom_id': quant.product_id.uom_id.id,
            #                                    'product_qty': quant.qty,
            #                                    'qty_done': quant.qty,
            #                                    'location_id': quant.location_id.id, # Could be ops too
            #                                    'location_dest_id': ops.location_dest_id.id,
            #                                    'picking_id': pick.id
            #                                    }) # Might change first element
            # # Link existing moves or add moves when no one is related
            for ops in pick.move_line_ids.filtered(lambda x: not x.move_id):
                # Search move with this product
                moves = pick.move_lines.filtered(lambda x: x.product_id == ops.product_id)
                moves = sorted(moves, key=lambda m: m.quantity_done < m.product_qty, reverse=True)
                if moves:
                    ops.move_id = moves[0].id
                else:
                    new_move = self.env['stock.move'].create({
                                                    'name': _('New Move:') + ops.product_id.display_name,
                                                    'product_id': ops.product_id.id,
                                                    'product_uom_qty': ops.qty_done,
                                                    'product_uom': ops.product_uom_id.id,
                                                    'location_id': pick.location_id.id,
                                                    'location_dest_id': pick.location_dest_id.id,
                                                    'picking_id': pick.id,
                                                    'picking_type_id': pick.picking_type_id.id,
                                                   })
                    ops.move_id = new_move.id
                    new_move._action_confirm()
                    todo_moves |= new_move
                    #'qty_done': ops.qty_done})
        todo_moves._action_done()
        self.write({'date_done': fields.Datetime.now()})
        return True

    def _check_move_lines_map_quant_package(self, package):
        """ This method checks that all product of the package (quant) are well present in the move_line_ids of the picking. """
        all_in = True
        pack_move_lines = self.move_line_ids.filtered(lambda ml: ml.package_id == package)
        keys = ['product_id', 'lot_id']
        precision_digits = self.env['decimal.precision'].precision_get('Product Unit of Measure')

        grouped_quants = {}
        for k, g in groupby(sorted(package.quant_ids, key=itemgetter(*keys)), key=itemgetter(*keys)):
            grouped_quants[k] = sum(self.env['stock.quant'].concat(*list(g)).mapped('quantity'))

        grouped_ops = {}
        for k, g in groupby(sorted(pack_move_lines, key=itemgetter(*keys)), key=itemgetter(*keys)):
            grouped_ops[k] = sum(self.env['stock.move.line'].concat(*list(g)).mapped('product_qty'))
        if any(not float_is_zero(grouped_quants.get(key, 0) - grouped_ops.get(key, 0), precision_digits=precision_digits) for key in grouped_quants) \
                or any(not float_is_zero(grouped_ops.get(key, 0) - grouped_quants.get(key, 0), precision_digits=precision_digits) for key in grouped_ops):
            all_in = False
        return all_in

    @api.multi
    def _check_entire_pack(self):
        """ This function check if entire packs are moved in the picking"""
        for picking in self:
            origin_packages = picking.move_line_ids.mapped("package_id")
            for pack in origin_packages:
                if picking._check_move_lines_map_quant_package(pack):
                    package_level_ids = picking.package_level_ids.filtered(lambda pl: pl.package_id == pack)
                    move_lines_to_pack = picking.move_line_ids.filtered(lambda ml: ml.package_id == pack)
                    if not package_level_ids:
                        self.env['stock.package_level'].create({
                            'picking_id': picking.id,
                            'package_id': pack.id,
                            'location_id': pack.location_id.id,
                            'location_dest_id': picking.move_line_ids.filtered(lambda ml: ml.package_id == pack).mapped('location_dest_id')[:1].id,
                            'move_line_ids': [(6, 0, move_lines_to_pack.ids)]
                        })
                        move_lines_to_pack.write({
                            'result_package_id': pack.id,
                        })
                    else:
                        move_lines_in_package_level = move_lines_to_pack.filtered(lambda ml: ml.move_id.package_level_id)
                        move_lines_without_package_level = move_lines_to_pack - move_lines_in_package_level
                        for ml in move_lines_in_package_level:
                            ml.write({
                                'result_package_id': pack.id,
                                'package_level_id': ml.move_id.package_level_id.id,
                            })
                        move_lines_without_package_level.write({
                            'result_package_id': pack.id,
                            'package_level_id': package_level_ids[0].id,
                        })

    @api.multi
    def do_unreserve(self):
        for picking in self:
            picking.move_lines._do_unreserve()
            picking.package_level_ids.filtered(lambda p: not p.move_ids).unlink()

    @api.multi
    def button_validate(self):
        self.ensure_one()
        if not self.move_lines and not self.move_line_ids:
            raise UserError(_('Please add some items to move.'))

        # If no lots when needed, raise error
        picking_type = self.picking_type_id
        precision_digits = self.env['decimal.precision'].precision_get('Product Unit of Measure')
        no_quantities_done = all(float_is_zero(move_line.qty_done, precision_digits=precision_digits) for move_line in self.move_line_ids.filtered(lambda m: m.state not in ('done', 'cancel')))
        no_reserved_quantities = all(float_is_zero(move_line.product_qty, precision_rounding=move_line.product_uom_id.rounding) for move_line in self.move_line_ids)
        if no_reserved_quantities and no_quantities_done:
            raise UserError(_('You cannot validate a transfer if no quantites are reserved nor done. To force the transfer, switch in edit more and encode the done quantities.'))

        if picking_type.use_create_lots or picking_type.use_existing_lots:
            lines_to_check = self.move_line_ids
            if not no_quantities_done:
                lines_to_check = lines_to_check.filtered(
                    lambda line: float_compare(line.qty_done, 0,
                                               precision_rounding=line.product_uom_id.rounding)
                )

            for line in lines_to_check:
                product = line.product_id
                if product and product.tracking != 'none':
                    if not line.lot_name and not line.lot_id:
                        raise UserError(_('You need to supply a Lot/Serial number for product %s.') % product.display_name)

        if no_quantities_done:
            view = self.env.ref('stock.view_immediate_transfer')
            wiz = self.env['stock.immediate.transfer'].create({'pick_ids': [(4, self.id)]})
            return {
                'name': _('Immediate Transfer?'),
                'type': 'ir.actions.act_window',
                'view_type': 'form',
                'view_mode': 'form',
                'res_model': 'stock.immediate.transfer',
                'views': [(view.id, 'form')],
                'view_id': view.id,
                'target': 'new',
                'res_id': wiz.id,
                'context': self.env.context,
            }

        if self._get_overprocessed_stock_moves() and not self._context.get('skip_overprocessed_check'):
            view = self.env.ref('stock.view_overprocessed_transfer')
            wiz = self.env['stock.overprocessed.transfer'].create({'picking_id': self.id})
            return {
                'type': 'ir.actions.act_window',
                'view_type': 'form',
                'view_mode': 'form',
                'res_model': 'stock.overprocessed.transfer',
                'views': [(view.id, 'form')],
                'view_id': view.id,
                'target': 'new',
                'res_id': wiz.id,
                'context': self.env.context,
            }

        # Check backorder should check for other barcodes
        if self._check_backorder():
            return self.action_generate_backorder_wizard()
        self.action_done()
        return

    def action_generate_backorder_wizard(self):
        view = self.env.ref('stock.view_backorder_confirmation')
        wiz = self.env['stock.backorder.confirmation'].create({'pick_ids': [(4, p.id) for p in self]})
        return {
            'name': _('Create Backorder?'),
            'type': 'ir.actions.act_window',
            'view_type': 'form',
            'view_mode': 'form',
            'res_model': 'stock.backorder.confirmation',
            'views': [(view.id, 'form')],
            'view_id': view.id,
            'target': 'new',
            'res_id': wiz.id,
            'context': self.env.context,
        }

    def action_toggle_is_locked(self):
        self.ensure_one()
        self.is_locked = not self.is_locked
        return True

    def _check_backorder(self):
        """ This method will loop over all the move lines of self and
        check if creating a backorder is necessary. This method is
        called during button_validate if the user has already processed
        some quantities and in the immediate transfer wizard that is
        displayed if the user has not processed any quantities.

        :return: True if a backorder is necessary else False
        """
        quantity_todo = {}
        quantity_done = {}
        for move in self.mapped('move_lines'):
            quantity_todo.setdefault(move.product_id.id, 0)
            quantity_done.setdefault(move.product_id.id, 0)
            quantity_todo[move.product_id.id] += move.product_uom_qty
            quantity_done[move.product_id.id] += move.quantity_done
        for ops in self.mapped('move_line_ids').filtered(lambda x: x.package_id and not x.product_id and not x.move_id):
            for quant in ops.package_id.quant_ids:
                quantity_done.setdefault(quant.product_id.id, 0)
                quantity_done[quant.product_id.id] += quant.qty
        for pack in self.mapped('move_line_ids').filtered(lambda x: x.product_id and not x.move_id):
            quantity_done.setdefault(pack.product_id.id, 0)
            quantity_done[pack.product_id.id] += pack.product_uom_id._compute_quantity(pack.qty_done, pack.product_id.uom_id)
        return any(quantity_done[x] < quantity_todo.get(x, 0) for x in quantity_done)

    @api.multi
    def _autoconfirm_picking(self):
        for picking in self.filtered(lambda picking: picking.immediate_transfer and picking.state not in ('done', 'cancel') and (picking.move_lines or picking.package_level_ids)):
            picking.action_confirm()

    def _get_overprocessed_stock_moves(self):
        self.ensure_one()
        return self.move_lines.filtered(
            lambda move: move.product_uom_qty != 0 and float_compare(move.quantity_done, move.product_uom_qty,
                                                                     precision_rounding=move.product_uom.rounding) == 1
        )

    @api.multi
    def _create_backorder(self, backorder_moves=[]):
        """ Move all non-done lines into a new backorder picking.
        """
        backorders = self.env['stock.picking']
        for picking in self:
            moves_to_backorder = picking.move_lines.filtered(lambda x: x.state not in ('done', 'cancel'))
            if moves_to_backorder:
                backorder_picking = picking.copy({
                    'name': '/',
                    'move_lines': [],
                    'move_line_ids': [],
                    'backorder_id': picking.id
                })
                picking.message_post(
                    body=_('The backorder <a href=# data-oe-model=stock.picking data-oe-id=%d>%s</a> has been created.') % (
                        backorder_picking.id, backorder_picking.name))
                moves_to_backorder.write({'picking_id': backorder_picking.id})
                moves_to_backorder.mapped('package_level_id').write({'picking_id':backorder_picking.id})
                moves_to_backorder.mapped('move_line_ids').write({'picking_id': backorder_picking.id})
                backorder_picking.action_assign()
                backorders |= backorder_picking
        return backorders

    def _log_activity_get_documents(self, orig_obj_changes, stream_field, stream, sorted_method=False, groupby_method=False):
        """ Generic method to log activity. To use with
        _log_activity method. It either log on uppermost
        ongoing documents or following documents. This method
        find all the documents and responsible for which a note
        has to be log. It also generate a rendering_context in
        order to render a specific note by documents containing
        only the information relative to the document it. For example
        we don't want to notify a picking on move that it doesn't
        contain.

        :param orig_obj_changes dict: contain a record as key and the
        change on this record as value.
        eg: {'move_id': (new product_uom_qty, old product_uom_qty)}
        :param stream_field string: It has to be a field of the
        records that are register in the key of 'orig_obj_changes'
        eg: 'move_dest_ids' if we use move as record (previous example)
            - 'UP' if we want to log on the upper most ongoing
            documents.
            - 'DOWN' if we want to log on following documents.
        :param sorted_method method, groupby_method: Only need when
        stream is 'DOWN', it should sort/group by tuple(object on
        which the activity is log, the responsible for this object)
        """
        move_to_orig_object_rel = {co: ooc for ooc in orig_obj_changes.keys() for co in ooc[stream_field]}
        origin_objects = self.env[list(orig_obj_changes.keys())[0]._name].concat(*list(orig_obj_changes.keys()))
        # The purpose here is to group each destination object by
        # (document to log, responsible) no matter the stream direction.
        # example:
        # {'(delivery_picking_1, admin)': stock.move(1, 2)
        #  '(delivery_picking_2, admin)': stock.move(3)}
        visited_documents = {}
        if stream == 'DOWN':
            if sorted_method and groupby_method:
                grouped_moves = groupby(sorted(origin_objects.mapped(stream_field), key=sorted_method), key=groupby_method)
            else:
                raise UserError(_('You have to define a groupby and sorted method and pass them as arguments.'))
        elif stream == 'UP':
            # When using upstream document it is required to define
            # _get_upstream_documents_and_responsibles on
            # destination objects in order to ascend documents.
            grouped_moves = {}
            for visited_move in origin_objects.mapped(stream_field):
                for document, responsible, visited in visited_move._get_upstream_documents_and_responsibles(self.env[visited_move._name]):
                    if grouped_moves.get((document, responsible)):
                        grouped_moves[(document, responsible)] |= visited_move
                        visited_documents[(document, responsible)] |= visited
                    else:
                        grouped_moves[(document, responsible)] = visited_move
                        visited_documents[(document, responsible)] = visited
            grouped_moves = grouped_moves.items()
        else:
            raise UserError(_('Unknow stream.'))

        documents = {}
        for (parent, responsible), moves in grouped_moves:
            if not parent:
                continue
            moves = list(moves)
            moves = self.env[moves[0]._name].concat(*moves)
            # Get the note
            rendering_context = {move: (orig_object, orig_obj_changes[orig_object]) for move in moves for orig_object in move_to_orig_object_rel[move]}
            if visited_documents:
                documents[(parent, responsible)] = rendering_context, visited_documents.values()
            else:
                documents[(parent, responsible)] = rendering_context
        return documents

    def _log_activity(self, render_method, documents):
        """ Log a note for each documents, responsible pair in
        documents passed as argument. The render_method is then
        call in order to use a template and render it with a
        rendering_context.

        :param documents dict: A tuple (document, responsible) as key.
        An activity will be log by key. A rendering_context as value.
        If used with _log_activity_get_documents. In 'DOWN' stream
        cases the rendering_context will be a dict with format:
        {'stream_object': ('orig_object', new_qty, old_qty)}
        'UP' stream will add all the documents browsed in order to
        get the final/upstream document present in the key.
        :param render_method method: a static function that will generate
        the html note to log on the activity. The render_method should
        use the args:
            - rendering_context dict: value of the documents argument
        the render_method should return a string with an html format
        :param stream string:
        """
        for (parent, responsible), rendering_context in documents.items():
            note = render_method(rendering_context)
            parent.activity_schedule(
                'mail.mail_activity_data_warning',
                date.today(),
                note=note,
                user_id=responsible.id
            )

    def _log_less_quantities_than_expected(self, moves):
        """ Log an activity on picking that follow moves. The note
        contains the moves changes and all the impacted picking.

        :param dict moves: a dict with a move as key and tuple with
        new and old quantity as value. eg: {move_1 : (4, 5)}
        """
        def _keys_in_sorted(move):
            """ sort by picking and the responsible for the product the
            move.
            """
            return (move.picking_id.id, move.product_id.responsible_id.id)

        def _keys_in_groupby(move):
            """ group by picking and the responsible for the product the
            move.
            """
            return (move.picking_id, move.product_id.responsible_id)

        def _render_note_exception_quantity(rendering_context):
            """ :param rendering_context:
            {'move_dest': (move_orig, (new_qty, old_qty))}
            """
            origin_moves = self.env['stock.move'].browse([move.id for move_orig in rendering_context.values() for move in move_orig[0]])
            origin_picking = origin_moves.mapped('picking_id')
            move_dest_ids = self.env['stock.move'].concat(*rendering_context.keys())
            impacted_pickings = origin_picking._get_impacted_pickings(move_dest_ids) - move_dest_ids.mapped('picking_id')
            values = {
                'origin_picking': origin_picking,
                'moves_information': rendering_context.values(),
                'impacted_pickings': impacted_pickings,
            }
            return self.env.ref('stock.exception_on_picking').render(values=values)

        documents = self._log_activity_get_documents(moves, 'move_dest_ids', 'DOWN', _keys_in_sorted, _keys_in_groupby)
        documents = self._less_quantities_than_expected_add_documents(moves, documents)
        self._log_activity(_render_note_exception_quantity, documents)

    def _less_quantities_than_expected_add_documents(self, moves, documents):
        return documents

    def _get_impacted_pickings(self, moves):
        """ This function is used in _log_less_quantities_than_expected
        the purpose is to notify a user with all the pickings that are
        impacted by an action on a chained move.
        param: 'moves' contain moves that belong to a common picking.
        return: all the pickings that contain a destination moves
        (direct and indirect) from the moves given as arguments.
        """

        def _explore(impacted_pickings, explored_moves, moves_to_explore):
            for move in moves_to_explore:
                if move not in explored_moves:
                    impacted_pickings |= move.picking_id
                    explored_moves |= move
                    moves_to_explore |= move.move_dest_ids
            moves_to_explore = moves_to_explore - explored_moves
            if moves_to_explore:
                return _explore(impacted_pickings, explored_moves, moves_to_explore)
            else:
                return impacted_pickings

        return _explore(self.env['stock.picking'], self.env['stock.move'], moves)

    def check_destinations(self):
        if len(self.move_line_ids.filtered(lambda l: l.qty_done > 0 and not l.result_package_id).mapped('location_dest_id')) > 1:
            view_id = self.env.ref('stock.stock_package_destination_form_view').id
            wiz = self.env['stock.package.destination'].create({
                'picking_id': self.id,
                'location_dest_id': self.move_line_ids[0].location_dest_id.id,
            })
            return {
                'name': _('Choose destination location'),
                'view_type': 'form',
                'view_mode': 'form',
                'res_model': 'stock.package.destination',
                'view_id': view_id,
                'views': [(view_id, 'form')],
                'type': 'ir.actions.act_window',
                'res_id': wiz.id,
                'target': 'new'
            }
        else:
            return {}

    def _put_in_pack(self):
        package = False
        for pick in self.filtered(lambda p: p.state not in ('done', 'cancel')):
            move_line_ids = pick.move_line_ids.filtered(lambda o: o.qty_done > 0 and not o.result_package_id)
            if move_line_ids:
                move_lines_to_pack = self.env['stock.move.line']
                package = self.env['stock.quant.package'].create({})
                for ml in move_line_ids:
                    if float_compare(ml.qty_done, ml.product_uom_qty,
                                     precision_rounding=ml.product_uom_id.rounding) >= 0:
                        move_lines_to_pack |= ml
                    else:
                        quantity_left_todo = float_round(
                            ml.product_uom_qty - ml.qty_done,
                            precision_rounding=ml.product_uom_id.rounding,
                            rounding_method='UP')
                        done_to_keep = ml.qty_done
                        new_move_line = ml.copy(
                            default={'product_uom_qty': 0, 'qty_done': ml.qty_done})
                        ml.write({'product_uom_qty': quantity_left_todo, 'qty_done': 0.0})
                        new_move_line.write({'product_uom_qty': done_to_keep})
                        move_lines_to_pack |= new_move_line

                package_level = self.env['stock.package_level'].create({
                    'package_id': package.id,
                    'picking_id': pick.id,
                    'location_id': False,
                    'location_dest_id': move_line_ids.mapped('location_dest_id').id,
                    'move_line_ids': [(6, 0, move_lines_to_pack.ids)]
                })
                move_lines_to_pack.write({
                    'result_package_id': package.id,
                })
            else:
                raise UserError(_('You must first set the quantity you will put in the pack.'))
        return package

    def put_in_pack(self):
        res = self.check_destinations()
        if res.get('type'):
            return res
        return self._put_in_pack()

    def button_scrap(self):
        self.ensure_one()
        view = self.env.ref('stock.stock_scrap_form_view2')
        products = self.env['product.product']
        for move in self.move_lines:
            if move.state not in ('draft', 'cancel') and move.product_id.type in ('product', 'consu'):
                products |= move.product_id
        return {
            'name': _('Scrap'),
            'view_type': 'form',
            'view_mode': 'form',
            'res_model': 'stock.scrap',
            'view_id': view.id,
            'views': [(view.id, 'form')],
            'type': 'ir.actions.act_window',
            'context': {'default_picking_id': self.id, 'product_ids': products.ids},
            'target': 'new',
        }

    def action_see_move_scrap(self):
        self.ensure_one()
        action = self.env.ref('stock.action_stock_scrap').read()[0]
        scraps = self.env['stock.scrap'].search([('picking_id', '=', self.id)])
        action['domain'] = [('id', 'in', scraps.ids)]
        return action

    def action_see_packages(self):
        self.ensure_one()
        action = self.env.ref('stock.action_package_view').read()[0]
        packages = self.move_line_ids.mapped('result_package_id')
        action['domain'] = [('id', 'in', packages.ids)]
        action['context'] = {'picking_id': self.id}
        return action
