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

from odoo import api, fields, models, _
from odoo.addons import decimal_precision as dp
from odoo.exceptions import UserError, ValidationError
from odoo.tools import float_utils, float_compare


class Inventory(models.Model):
    _name = "stock.inventory"
    _description = "Inventory"
    _order = "date desc, id desc"

    @api.model
    def _default_location_id(self):
        company_user = self.env.user.company_id
        warehouse = self.env['stock.warehouse'].search([('company_id', '=', company_user.id)], limit=1)
        if warehouse:
            return warehouse.lot_stock_id.id
        else:
            raise UserError(_('You must define a warehouse for the company: %s.') % (company_user.name,))

    name = fields.Char(
        'Inventory Reference',
        readonly=True, required=True,
        states={'draft': [('readonly', False)]})
    date = fields.Datetime(
        'Inventory Date',
        readonly=True, required=True,
        default=fields.Datetime.now,
        help="If the inventory adjustment is not validated, date at which the theoritical quantities have been checked.\n"
             "If the inventory adjustment is validated, date at which the inventory adjustment has been validated.")
    line_ids = fields.One2many(
        'stock.inventory.line', 'inventory_id', string='Inventories',
        copy=True, readonly=False,
        states={'done': [('readonly', True)]})
    move_ids = fields.One2many(
        'stock.move', 'inventory_id', string='Created Moves',
        states={'done': [('readonly', True)]})
    state = fields.Selection(string='Status', selection=[
        ('draft', 'Draft'),
        ('cancel', 'Cancelled'),
        ('confirm', 'In Progress'),
        ('done', 'Validated')],
        copy=False, index=True, readonly=True,
        default='draft')
    company_id = fields.Many2one(
        'res.company', 'Company',
        readonly=True, index=True, required=True,
        states={'draft': [('readonly', False)]},
        default=lambda self: self.env['res.company']._company_default_get('stock.inventory'))
    location_id = fields.Many2one(
        'stock.location', 'Inventoried Location',
        readonly=True, required=True,
        states={'draft': [('readonly', False)]},
        default=_default_location_id)
    product_id = fields.Many2one(
        'product.product', 'Inventoried Product',
        readonly=True,
        states={'draft': [('readonly', False)]},
        help="Specify Product to focus your inventory on a particular Product.")
    package_id = fields.Many2one(
        'stock.quant.package', 'Inventoried Pack',
        readonly=True,
        states={'draft': [('readonly', False)]},
        help="Specify Pack to focus your inventory on a particular Pack.")
    partner_id = fields.Many2one(
        'res.partner', 'Inventoried Owner',
        readonly=True,
        states={'draft': [('readonly', False)]},
        help="Specify Owner to focus your inventory on a particular Owner.")
    lot_id = fields.Many2one(
        'stock.production.lot', 'Inventoried Lot/Serial Number',
        copy=False, readonly=True,
        states={'draft': [('readonly', False)]},
        help="Specify Lot/Serial Number to focus your inventory on a particular Lot/Serial Number.")
    filter = fields.Selection(
        string='Inventory of', selection='_selection_filter',
        required=True,
        default='none',
        help="If you do an entire inventory, you can choose 'All Products' and it will prefill the inventory with the current stock.  If you only do some products  "
             "(e.g. Cycle Counting) you can choose 'Manual Selection of Products' and the system won't propose anything.  You can also let the "
             "system propose for a single product / lot /... ")
    total_qty = fields.Float('Total Quantity', compute='_compute_total_qty')
    category_id = fields.Many2one(
        'product.category', 'Product Category',
        readonly=True, states={'draft': [('readonly', False)]},
        help="Specify Product Category to focus your inventory on a particular Category.")
    exhausted = fields.Boolean('Include Exhausted Products', readonly=True, states={'draft': [('readonly', False)]})

    @api.one
    @api.depends('product_id', 'line_ids.product_qty')
    def _compute_total_qty(self):
        """ For single product inventory, total quantity of the counted """
        if self.product_id:
            self.total_qty = sum(self.mapped('line_ids').mapped('product_qty'))
        else:
            self.total_qty = 0

    @api.multi
    def unlink(self):
        for inventory in self:
            if inventory.state == 'done':
                raise UserError(_('You cannot delete a validated inventory adjustement.'))
        return super(Inventory, self).unlink()

    @api.model
    def _selection_filter(self):
        """ Get the list of filter allowed according to the options checked
        in 'Settings\Warehouse'. """
        res_filter = [
            ('none', _('All products')),
            ('category', _('One product category')),
            ('product', _('One product only')),
            ('partial', _('Select products manually'))]

        if self.user_has_groups('stock.group_tracking_owner'):
            res_filter += [('owner', _('One owner only')), ('product_owner', _('One product for a specific owner'))]
        if self.user_has_groups('stock.group_production_lot'):
            res_filter.append(('lot', _('One Lot/Serial Number')))
        if self.user_has_groups('stock.group_tracking_lot'):
            res_filter.append(('pack', _('A Pack')))
        return res_filter

    @api.onchange('filter')
    def _onchange_filter(self):
        if self.filter not in ('product', 'product_owner'):
            self.product_id = False
        if self.filter != 'lot':
            self.lot_id = False
        if self.filter not in ('owner', 'product_owner'):
            self.partner_id = False
        if self.filter != 'pack':
            self.package_id = False
        if self.filter != 'category':
            self.category_id = False
        if self.filter == 'product':
            self.exhausted = True
            if self.product_id:
                return {'domain': {'product_id': [('product_tmpl_id', '=', self.product_id.product_tmpl_id.id)]}}

    @api.onchange('location_id')
    def _onchange_location_id(self):
        if self.location_id.company_id:
            self.company_id = self.location_id.company_id

    @api.one
    @api.constrains('filter', 'product_id', 'lot_id', 'partner_id', 'package_id')
    def _check_filter_product(self):
        if self.filter == 'none' and self.product_id and self.location_id and self.lot_id:
            return
        if self.filter not in ('product', 'product_owner') and self.product_id:
            raise ValidationError(_('The selected product doesn\'t belong to that owner..'))
        if self.filter != 'lot' and self.lot_id:
            raise ValidationError(_('The selected lot number doesn\'t exist.'))
        if self.filter not in ('owner', 'product_owner') and self.partner_id:
            raise ValidationError(_('The selected owner doesn\'t have the proprietary of that product.'))
        if self.filter != 'pack' and self.package_id:
            raise ValidationError(_('The selected inventory options are not coherent, the package doesn\'t exist.'))

    def action_reset_product_qty(self):
        self.mapped('line_ids').write({'product_qty': 0})
        return True

    def action_validate(self):
        inventory_lines = self.line_ids.filtered(lambda l: l.product_id.tracking in ['lot', 'serial'] and not l.prod_lot_id and l.theoretical_qty != l.product_qty)
        lines = self.line_ids.filtered(lambda l: float_compare(l.product_qty, 1, precision_rounding=l.product_uom_id.rounding) > 0 and l.product_id.tracking == 'serial' and l.prod_lot_id)
        if inventory_lines and not lines:
            wiz_lines = [(0, 0, {'product_id': product.id, 'tracking': product.tracking}) for product in inventory_lines.mapped('product_id')]
            wiz = self.env['stock.track.confirmation'].create({'inventory_id': self.id, 'tracking_line_ids': wiz_lines})
            return {
                    'name': _('Tracked Products in Inventory Adjustment'),
                    'type': 'ir.actions.act_window',
                    'view_mode': 'form',
                    'res_model': 'stock.track.confirmation',
                    'target': 'new',
                    'res_id': wiz.id,
                }
        else:
            self._action_done()

    def _action_done(self):
        negative = next((line for line in self.mapped('line_ids') if line.product_qty < 0 and line.product_qty != line.theoretical_qty), False)
        if negative:
            raise UserError(_('You cannot set a negative product quantity in an inventory line:\n\t%s - qty: %s') % (negative.product_id.name, negative.product_qty))
        self.action_check()
        self.write({'state': 'done'})
        self.post_inventory()
        return True

    def post_inventory(self):
        # The inventory is posted as a single step which means quants cannot be moved from an internal location to another using an inventory
        # as they will be moved to inventory loss, and other quants will be created to the encoded quant location. This is a normal behavior
        # as quants cannot be reuse from inventory location (users can still manually move the products before/after the inventory if they want).
        self.mapped('move_ids').filtered(lambda move: move.state != 'done')._action_done()

    def action_check(self):
        """ Checks the inventory and computes the stock move to do """
        # tde todo: clean after _generate_moves
        for inventory in self.filtered(lambda x: x.state not in ('done','cancel')):
            # first remove the existing stock moves linked to this inventory
            inventory.mapped('move_ids').unlink()
            inventory.line_ids._generate_moves()

    def action_cancel_draft(self):
        self.mapped('move_ids')._action_cancel()
        self.write({
            'line_ids': [(5,)],
            'state': 'draft'
        })

    def action_start(self):
        for inventory in self.filtered(lambda x: x.state not in ('done','cancel')):
            vals = {'state': 'confirm', 'date': fields.Datetime.now()}
            if (inventory.filter != 'partial') and not inventory.line_ids:
                vals.update({'line_ids': [(0, 0, line_values) for line_values in inventory._get_inventory_lines_values()]})
            inventory.write(vals)
        return True

    def action_inventory_line_tree(self):
        action = self.env.ref('stock.action_inventory_line_tree').read()[0]
        action['context'] = {
            'default_location_id': self.location_id.id,
            'default_product_id': self.product_id.id,
            'default_prod_lot_id': self.lot_id.id,
            'default_package_id': self.package_id.id,
            'default_partner_id': self.partner_id.id,
            'default_inventory_id': self.id,
        }
        return action

    def _get_inventory_lines_values(self):
        # TDE CLEANME: is sql really necessary ? I don't think so
        locations = self.env['stock.location'].search([('id', 'child_of', [self.location_id.id])])
        domain = ' location_id in %s AND quantity != 0 AND active = TRUE'
        args = (tuple(locations.ids),)

        vals = []
        Product = self.env['product.product']
        # Empty recordset of products available in stock_quants
        quant_products = self.env['product.product']
        # Empty recordset of products to filter
        products_to_filter = self.env['product.product']

        # case 0: Filter on company
        if self.company_id:
            domain += ' AND company_id = %s'
            args += (self.company_id.id,)

        #case 1: Filter on One owner only or One product for a specific owner
        if self.partner_id:
            domain += ' AND owner_id = %s'
            args += (self.partner_id.id,)
        #case 2: Filter on One Lot/Serial Number
        if self.lot_id:
            domain += ' AND lot_id = %s'
            args += (self.lot_id.id,)
        #case 3: Filter on One product
        if self.product_id:
            domain += ' AND product_id = %s'
            args += (self.product_id.id,)
            products_to_filter |= self.product_id
        #case 4: Filter on A Pack
        if self.package_id:
            domain += ' AND package_id = %s'
            args += (self.package_id.id,)
        #case 5: Filter on One product category + Exahausted Products
        if self.category_id:
            categ_products = Product.search([('categ_id', 'child_of', self.category_id.id)])
            domain += ' AND product_id = ANY (%s)'
            args += (categ_products.ids,)
            products_to_filter |= categ_products

        self.env.cr.execute("""SELECT product_id, sum(quantity) as product_qty, location_id, lot_id as prod_lot_id, package_id, owner_id as partner_id
            FROM stock_quant
            LEFT JOIN product_product
            ON product_product.id = stock_quant.product_id
            WHERE %s
            GROUP BY product_id, location_id, lot_id, package_id, partner_id """ % domain, args)

        for product_data in self.env.cr.dictfetchall():
            # replace the None the dictionary by False, because falsy values are tested later on
            for void_field in [item[0] for item in product_data.items() if item[1] is None]:
                product_data[void_field] = False
            product_data['theoretical_qty'] = product_data['product_qty']
            if product_data['product_id']:
                product_data['product_uom_id'] = Product.browse(product_data['product_id']).uom_id.id
                quant_products |= Product.browse(product_data['product_id'])
            vals.append(product_data)
        if self.exhausted:
            exhausted_vals = self._get_exhausted_inventory_line(products_to_filter, quant_products)
            vals.extend(exhausted_vals)
        return vals

    def _get_exhausted_inventory_line(self, products, quant_products):
        '''
        This function return inventory lines for exausted products
        :param products: products With Selected Filter.
        :param quant_products: products available in stock_quants
        '''
        vals = []
        exhausted_domain = [('type', 'not in', ('service', 'consu', 'digital'))]
        if products:
            exhausted_products = products - quant_products
            exhausted_domain += [('id', 'in', exhausted_products.ids)]
        else:
            exhausted_domain += [('id', 'not in', quant_products.ids)]
        exhausted_products = self.env['product.product'].search(exhausted_domain)
        for product in exhausted_products:
            vals.append({
                'inventory_id': self.id,
                'product_id': product.id,
                'location_id': self.location_id.id,
            })
        return vals


class InventoryLine(models.Model):
    _name = "stock.inventory.line"
    _description = "Inventory Line"
    _order = "product_id, inventory_id, location_id, prod_lot_id"

    inventory_id = fields.Many2one(
        'stock.inventory', 'Inventory',
        index=True, ondelete='cascade')
    partner_id = fields.Many2one('res.partner', 'Owner')
    product_id = fields.Many2one(
        'product.product', 'Product',
        domain=[('type', '=', 'product')],
        index=True, required=True)
    product_uom_id = fields.Many2one(
        'uom.uom', 'Product Unit of Measure',
        required=True)
    product_uom_category_id = fields.Many2one(string='Uom category', related='product_uom_id.category_id', readonly=True)
    product_qty = fields.Float(
        'Checked Quantity',
        digits=dp.get_precision('Product Unit of Measure'), default=0)
    location_id = fields.Many2one(
        'stock.location', 'Location',
        index=True, required=True)
    package_id = fields.Many2one(
        'stock.quant.package', 'Pack', index=True)
    prod_lot_id = fields.Many2one(
        'stock.production.lot', 'Lot/Serial Number',
        domain="[('product_id','=',product_id)]")
    company_id = fields.Many2one(
        'res.company', 'Company', related='inventory_id.company_id',
        index=True, readonly=True, store=True)
    # TDE FIXME: necessary ? -> replace by location_id
    state = fields.Selection(
        'Status',  related='inventory_id.state', readonly=True)
    theoretical_qty = fields.Float(
        'Theoretical Quantity', compute='_compute_theoretical_qty',
        digits=dp.get_precision('Product Unit of Measure'), readonly=True, store=True)
    inventory_location_id = fields.Many2one(
        'stock.location', 'Inventory Location', related='inventory_id.location_id', related_sudo=False, readonly=False)
    product_tracking = fields.Selection('Tracking', related='product_id.tracking', readonly=True)

    @api.one
    @api.depends('location_id', 'product_id', 'package_id', 'product_uom_id', 'company_id', 'prod_lot_id', 'partner_id')
    def _compute_theoretical_qty(self):
        if not self.product_id:
            self.theoretical_qty = 0
            return
        theoretical_qty = self.product_id.get_theoretical_quantity(
            self.product_id.id,
            self.location_id.id,
            lot_id=self.prod_lot_id.id,
            package_id=self.package_id.id,
            owner_id=self.partner_id.id,
            to_uom=self.product_uom_id.id,
        )
        self.theoretical_qty = theoretical_qty

    @api.onchange('product_id')
    def _onchange_product(self):
        res = {}
        # If no UoM or incorrect UoM put default one from product
        if self.product_id:
            self.product_uom_id = self.product_id.uom_id
            res['domain'] = {'product_uom_id': [('category_id', '=', self.product_id.uom_id.category_id.id)]}
        return res

    @api.onchange('product_id', 'location_id', 'product_uom_id', 'prod_lot_id', 'partner_id', 'package_id')
    def _onchange_quantity_context(self):
        if self.product_id and self.location_id and self.product_id.uom_id.category_id == self.product_uom_id.category_id:  # TDE FIXME: last part added because crash
            self._compute_theoretical_qty()
            self.product_qty = self.theoretical_qty

    @api.model_create_multi
    def create(self, vals_list):
        for values in vals_list:
            if 'product_id' in values and 'product_uom_id' not in values:
                values['product_uom_id'] = self.env['product.product'].browse(values['product_id']).uom_id.id
        res = super(InventoryLine, self).create(vals_list)
        res._check_no_duplicate_line()
        return res

    @api.multi
    def write(self,vals):
        res = super(InventoryLine, self).write(vals)
        self._check_no_duplicate_line()
        return res

    def _check_no_duplicate_line(self):
        for line in self:
            existings = self.search([
                ('id', '!=', line.id),
                ('product_id', '=', line.product_id.id),
                ('inventory_id.state', '=', 'confirm'),
                ('location_id', '=', line.location_id.id),
                ('partner_id', '=', line.partner_id.id),
                ('package_id', '=', line.package_id.id),
                ('prod_lot_id', '=', line.prod_lot_id.id)])
            if existings:
                raise UserError(_("You cannot have two inventory adjustments in state 'In Progress' with the same product (%s),"
                                   " same location, same package, same owner and same lot. Please first validate"
                                   " the first inventory adjustment before creating another one.") % (line.product_id.display_name))

    @api.constrains('product_id')
    def _check_product_id(self):
        """ As no quants are created for consumable products, it should not be possible do adjust
        their quantity.
        """
        for line in self:
            if line.product_id.type != 'product':
                raise ValidationError(_("You can only adjust storable products.") + '\n\n%s -> %s' % (line.product_id.display_name, line.product_id.type))

    def _get_move_values(self, qty, location_id, location_dest_id, out):
        self.ensure_one()
        return {
            'name': _('INV:') + (self.inventory_id.name or ''),
            'product_id': self.product_id.id,
            'product_uom': self.product_uom_id.id,
            'product_uom_qty': qty,
            'date': self.inventory_id.date,
            'company_id': self.inventory_id.company_id.id,
            'inventory_id': self.inventory_id.id,
            'state': 'confirmed',
            'restrict_partner_id': self.partner_id.id,
            'location_id': location_id,
            'location_dest_id': location_dest_id,
            'move_line_ids': [(0, 0, {
                'product_id': self.product_id.id,
                'lot_id': self.prod_lot_id.id,
                'product_uom_qty': 0,  # bypass reservation here
                'product_uom_id': self.product_uom_id.id,
                'qty_done': qty,
                'package_id': out and self.package_id.id or False,
                'result_package_id': (not out) and self.package_id.id or False,
                'location_id': location_id,
                'location_dest_id': location_dest_id,
                'owner_id': self.partner_id.id,
            })]
        }

    def _generate_moves(self):
        vals_list = []
        for line in self:
            if float_utils.float_compare(line.theoretical_qty, line.product_qty, precision_rounding=line.product_id.uom_id.rounding) == 0:
                continue
            diff = line.theoretical_qty - line.product_qty
            if diff < 0:  # found more than expected
                vals = line._get_move_values(abs(diff), line.product_id.property_stock_inventory.id, line.location_id.id, False)
            else:
                vals = line._get_move_values(abs(diff), line.location_id.id, line.product_id.property_stock_inventory.id, True)
            vals_list.append(vals)
        return self.env['stock.move'].create(vals_list)
