# Copyright 2016 Ucamco - Wim Audenaert <wim.audenaert@ucamco.com>
# Copyright 2016-19 Eficent Business and IT Consulting Services S.L.
# - Jordi Ballester Alomar <jordi.ballester@eficent.com>
# - Lois Rilo Antelo <lois.rilo@eficent.com>
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).

from math import ceil

from odoo import api, fields, models, _
from odoo.exceptions import ValidationError


class ProductMRPArea(models.Model):
    _name = 'product.mrp.area'
    _description = 'Product MRP Area'

    active = fields.Boolean(default=True)
    mrp_area_id = fields.Many2one(
        comodel_name='mrp.area',
        required=True,
    )
    product_id = fields.Many2one(
        comodel_name='product.product',
        required=True,
        string='Product',
    )
    product_tmpl_id = fields.Many2one(
        comodel_name='product.template',
        readonly=True,
        related='product_id.product_tmpl_id',
        store=True,
    )
    location_id = fields.Many2one(
        related="mrp_area_id.location_id",
    )
    location_proc_id = fields.Many2one(
        string="Procure Location",
        comodel_name="stock.location",
        domain="[('location_id', 'child_of', location_id)]",
        help="Set this if you need to procure from a different location"
             "than area's location.",
    )
    # TODO: applicable and exclude... redundant??
    mrp_applicable = fields.Boolean(string='MRP Applicable')
    mrp_exclude = fields.Boolean(string='Exclude from MRP')
    mrp_inspection_delay = fields.Integer(string='Inspection Delay')
    mrp_maximum_order_qty = fields.Float(
        string='Maximum Order Qty', default=0.0,
    )
    mrp_minimum_order_qty = fields.Float(
        string='Minimum Order Qty', default=0.0,
    )
    mrp_minimum_stock = fields.Float(string="Safety Stock")
    mrp_nbr_days = fields.Integer(
        string='Nbr. Days', default=0,
        help="Number of days to group demand for this product during the "
             "MRP run, in order to determine the quantity to order.",
    )
    mrp_qty_multiple = fields.Float(string='Qty Multiple', default=1.00)
    mrp_transit_delay = fields.Integer(string='Transit Delay', default=0)
    mrp_verified = fields.Boolean(
        string='Verified for MRP',
        help="Identifies that this product has been verified "
             "to be valid for the MRP.",
    )
    mrp_lead_time = fields.Float(
        string='Lead Time',
        compute='_compute_mrp_lead_time',
    )
    main_supplier_id = fields.Many2one(
        comodel_name='res.partner', string='Main Supplier',
        compute='_compute_main_supplier', store=True,
        index=True,
    )
    main_supplierinfo_id = fields.Many2one(
        comodel_name='product.supplierinfo', string='Supplier Info',
        compute='_compute_main_supplier', store=True,
    )
    supply_method = fields.Selection(
        selection=[('buy', 'Buy'),
                   ('none', 'Undefined'),
                   ('manufacture', 'Produce'),
                   ('move', 'Transfer')],
        string='Supply Method',
        compute='_compute_supply_method',
    )

    qty_available = fields.Float(
        string="Quantity Available",
        compute="_compute_qty_available",
    )
    mrp_move_ids = fields.One2many(
        comodel_name='mrp.move',
        inverse_name='product_mrp_area_id',
        readonly=True,
    )
    planned_order_ids = fields.One2many(
        comodel_name="mrp.planned.order",
        inverse_name="product_mrp_area_id",
        readonly=True,
    )
    group_estimate_days = fields.Integer(
        string="Group Days of Estimates",
        default=1,
    )
    _sql_constraints = [
        ('product_mrp_area_uniq', 'unique(product_id, mrp_area_id)',
         'The product/MRP Area parameters combination must be unique.'),
    ]

    @api.multi
    @api.constrains(
        "mrp_minimum_order_qty", "mrp_maximum_order_qty", "mrp_qty_multiple",
        "mrp_minimum_stock", "mrp_nbr_days", "group_estimate_days",
    )
    def _check_negatives(self):
        values = self.read([
            "mrp_minimum_order_qty", "mrp_maximum_order_qty",
            "mrp_qty_multiple",
            "mrp_minimum_stock", "mrp_nbr_days", "group_estimate_days",
        ])
        for rec in values:
            if any(v < 0 for v in rec.values()):
                raise ValidationError(_("You cannot use a negative number."))

    @api.multi
    def name_get(self):
        return [(area.id, '[%s] %s' % (
            area.mrp_area_id.name,
            area.product_id.display_name)) for area in self]

    @api.multi
    def _compute_mrp_lead_time(self):
        produced = self.filtered(lambda r: r.supply_method == "manufacture")
        purchased = self.filtered(lambda r: r.supply_method == "buy")
        for rec in produced:
            rec.mrp_lead_time = rec.product_id.produce_delay
        for rec in purchased:
            rec.mrp_lead_time = rec.main_supplierinfo_id.delay
        # TODO: 'move' supply method.
        for rec in (self - produced - purchased):
            rec.mrp_lead_time = 0

    @api.multi
    def _compute_qty_available(self):
        for rec in self:
            rec.qty_available = rec.product_id.with_context(
                {'location': rec.mrp_area_id.location_id.id}).qty_available

    @api.multi
    def _compute_supply_method(self):
        group_obj = self.env['procurement.group']
        for rec in self:
            proc_loc = rec.location_proc_id or rec.mrp_area_id.location_id
            values = {
                'warehouse_id': rec.mrp_area_id.warehouse_id,
                'company_id': self.env.user.company_id.id,
                # TODO: better way to get company
            }
            rule = group_obj._get_rule(rec.product_id, proc_loc, values)
            rec.supply_method = rule.action if rule else 'none'

    @api.multi
    @api.depends('supply_method', 'product_id.route_ids',
                 'product_id.seller_ids')
    def _compute_main_supplier(self):
        """Simplified and similar to procurement.rule logic."""
        for rec in self.filtered(lambda r: r.supply_method == 'buy'):
            suppliers = rec.product_id.seller_ids.filtered(
                lambda r: (not r.product_id or r.product_id == rec.product_id))
            if not suppliers:
                continue
            rec.main_supplierinfo_id = suppliers[0]
            rec.main_supplier_id = suppliers[0].name

    @api.multi
    def _adjust_qty_to_order(self, qty_to_order):
        self.ensure_one()
        if (not self.mrp_maximum_order_qty and not
                self.mrp_minimum_order_qty and self.mrp_qty_multiple == 1.0):
            return qty_to_order
        if qty_to_order < self.mrp_minimum_order_qty:
            return self.mrp_minimum_order_qty
        if self.mrp_qty_multiple:
            multiplier = ceil(qty_to_order / self.mrp_qty_multiple)
            qty_to_order = multiplier * self.mrp_qty_multiple
        if self.mrp_maximum_order_qty and qty_to_order > \
                self.mrp_maximum_order_qty:
            return self.mrp_maximum_order_qty
        return qty_to_order