# © 2016 Ucamco - Wim Audenaert <wim.audenaert@ucamco.com>
# Copyright 2016-18 Eficent Business and IT Consulting Services S.L.
# - Jordi Ballester Alomar <jordi.ballester@eficent.com>
# License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl.html).

from odoo import api, fields, models

from datetime import timedelta, date


class MrpInventory(models.Model):
    _name = 'mrp.inventory'
    _order = 'mrp_product_id, date'
    _description = 'MRP inventory projections'
    _rec_name = 'mrp_product_id'

    # TODO: name to pass to procurements?
    # TODO: compute procurement_date to pass to the wizard? not needed for
    # PO at least. Check for MO and moves
    # TODO: substract qty already procured.
    # TODO: show a LT based on the procure method?

    mrp_area_id = fields.Many2one(
        comodel_name='mrp.area', string='MRP Area',
        related='mrp_product_id.mrp_area_id', store=True,
    )
    mrp_product_id = fields.Many2one(
        comodel_name='mrp.product', string='Product',
        index=True,
    )
    uom_id = fields.Many2one(
        comodel_name='product.uom', string='Product UoM',
        compute='_compute_uom_id',
    )
    date = fields.Date(string='Date')
    demand_qty = fields.Float(string='Demand')
    supply_qty = fields.Float(string='Supply')
    initial_on_hand_qty = fields.Float(string='Starting Inventory')
    final_on_hand_qty = fields.Float(string='Forecasted Inventory')
    to_procure = fields.Float(string='To procure')
    date_to_procure = fields.Date(
        string="Date to Procure",
        compute="_compute_date_to_procure",
        store=True,
    )

    @api.multi
    def _compute_uom_id(self):
        for rec in self:
            rec.uom_id = rec.mrp_product_id.product_id.uom_id

    @api.multi
    @api.depends('mrp_product_id', 'mrp_product_id.main_supplierinfo_id',
                 'mrp_product_id.mrp_lead_time')
    def _compute_date_to_procure(self):
        today = date.today()
        for rec in self.filtered(lambda r: r.date):
            delay = 0
            if rec.mrp_product_id.supply_method == 'buy':
                delay = rec.mrp_product_id.main_supplierinfo_id.delay
            elif rec.mrp_product_id.supply_method == 'manufacture':
                delay = rec.mrp_product_id.mrp_lead_time
            # TODO: 'move' supply method
            date_to_procure = fields.Date.from_string(
                rec.date) - timedelta(days=delay)
            if date_to_procure < today:
                date_to_procure = today
            rec.date_to_procure = date_to_procure