# 2016 Akretion (http://www.akretion.com)
# David BEAL <david.beal@akretion.com>
# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl).

from odoo import api, fields, models


class MrpWorkcenter(models.Model):
    _inherit = "mrp.workcenter"
    _parent_name = "parent_id"
    _parent_store = True

    parent_id = fields.Many2one(
        comodel_name="mrp.workcenter", string="Parent", index=True
    )
    parent_path = fields.Char(index=True, unaccent=False)
    child_ids = fields.One2many(
        comodel_name="mrp.workcenter", inverse_name="parent_id", string="Children"
    )
    parent_level_1_id = fields.Many2one(
        comodel_name="mrp.workcenter",
        compute="_compute_parent_level",
        string="Parent Level 1",
        store=True,
    )
    parent_level_2_id = fields.Many2one(
        comodel_name="mrp.workcenter",
        compute="_compute_parent_level",
        string="Parent Level 2",
        store=True,
    )
    parent_level_3_id = fields.Many2one(
        comodel_name="mrp.workcenter",
        compute="_compute_parent_level",
        string="Parent Level 3",
        store=True,
    )

    def _get_parent_ids(self):
        self.ensure_one()
        if self.parent_id:
            ids = self.parent_id._get_parent_ids()
            ids.append(self.parent_id.id)
        else:
            ids = []
        return ids

    @api.depends(
        "parent_id.parent_id.parent_id",
        "child_ids",
        "company_id.workcenter_parent_level_empty",
    )
    def _compute_parent_level(self):
        def get_next_level(parent_ids, workcenter, exclude_ids):
            has_parent = bool(parent_ids)
            parent_level_id = (
                parent_ids
                and parent_ids.pop(0)
                or (workcenter.child_ids and workcenter.id or workcenter.parent_id.id)
            )
            if exclude_ids and not has_parent:
                exclude_ids.append(workcenter.parent_id.id)
            return parent_level_id not in exclude_ids and parent_level_id or False

        for workcenter in self:
            parent_ids = workcenter._get_parent_ids()
            if workcenter.company_id.workcenter_parent_level_empty:
                exclude_ids = [workcenter.id]
            else:
                exclude_ids = []

            workcenter.parent_level_1_id = get_next_level(
                parent_ids, workcenter, exclude_ids
            )
            workcenter.parent_level_2_id = get_next_level(
                parent_ids, workcenter, exclude_ids
            )
            workcenter.parent_level_3_id = get_next_level(
                parent_ids, workcenter, exclude_ids
            )