# License AGPL-3.0 or later (http://www.gnu.org/licenses/agpl.html).

from odoo import api, fields, models
from odoo.osv import expression


class ResPartner(models.Model):
    _inherit = "res.partner"

    contact_type = fields.Selection(
        [
            ("standalone", "Standalone Contact"),
            ("attached", "Attached to existing Contact"),
        ],
        compute="_compute_contact_type",
        store=True,
        index=True,
        default="standalone",
    )
    contact_id = fields.Many2one(
        "res.partner",
        string="Main Contact",
        domain=[("is_company", "=", False), ("contact_type", "=", "standalone")],
    )
    other_contact_ids = fields.One2many(
        "res.partner",
        "contact_id",
        string="Others Positions",
    )

    @api.depends("contact_id")
    def _compute_contact_type(self):
        for rec in self:
            rec.contact_type = "attached" if rec.contact_id else "standalone"

    def _basecontact_check_context(self, mode):
        """Remove "search_show_all_positions" for non-search mode.
        Keeping it in context can result in unexpected behaviour (ex: reading
        one2many might return wrong result - i.e with "attached contact"
        removed even if it"s directly linked to a company).
        Actually, is easier to override a dictionary value to indicate it
        should be ignored...
        """
        if mode != "search" and "search_show_all_positions" in self.env.context:
            result = self.with_context(search_show_all_positions={"is_set": False})
        else:
            result = self
        return result

    @api.model
    def search(self, args, offset=0, limit=None, order=None, count=False):
        """Display only standalone contact matching ``args`` or having
        attached contact matching ``args``"""
        ctx = self.env.context
        if (
            ctx.get("search_show_all_positions", {}).get("is_set")
            and not ctx["search_show_all_positions"]["set_value"]
        ):
            args = expression.normalize_domain(args)
            attached_contact_args = expression.AND(
                (args, [("contact_type", "=", "attached")])
            )
            attached_contacts = super(ResPartner, self).search(attached_contact_args)
            args = expression.OR(
                (
                    expression.AND(([("contact_type", "=", "standalone")], args)),
                    [("other_contact_ids", "in", attached_contacts.ids)],
                )
            )
        return super(ResPartner, self).search(
            args, offset=offset, limit=limit, order=order, count=count
        )

    @api.model
    def create(self, vals):
        """When creating, use a modified self to alter the context (see
        comment in _basecontact_check_context).  Also, we need to ensure
        that the name on an attached contact is the same as the name on the
        contact it is attached to."""
        modified_self = self._basecontact_check_context("create")
        if not vals.get("name") and vals.get("contact_id"):
            vals["name"] = modified_self.browse(vals["contact_id"]).name
        return super(ResPartner, modified_self).create(vals)

    def read(self, fields=None, load="_classic_read"):
        modified_self = self._basecontact_check_context("read")
        return super(ResPartner, modified_self).read(fields=fields, load=load)

    def write(self, vals):
        modified_self = self._basecontact_check_context("write")
        return super(ResPartner, modified_self).write(vals)

    def unlink(self):
        modified_self = self._basecontact_check_context("unlink")
        return super(ResPartner, modified_self).unlink()

    def _compute_commercial_partner(self):
        """Returns the partner that is considered the commercial
        entity of this partner. The commercial entity holds the master data
        for all commercial fields (see :py:meth:`~_commercial_fields`)"""
        result = super(ResPartner, self)._compute_commercial_partner()
        for partner in self:
            if partner.contact_type == "attached" and not partner.parent_id:
                partner.commercial_partner_id = partner.contact_id
        return result

    def _contact_fields(self):
        """Returns the list of contact fields that are synced from the parent
        when a partner is attached to him."""
        return ["name", "title"]

    def _contact_sync_from_parent(self):
        """Handle sync of contact fields when a new parent contact entity
        is set, as if they were related fields
        """
        self.ensure_one()
        if self.contact_id:
            contact_fields = self._contact_fields()
            sync_vals = self.contact_id._update_fields_values(contact_fields)
            self.write(sync_vals)

    def update_contact(self, vals):
        if self.env.context.get("__update_contact_lock"):
            return
        contact_fields = self._contact_fields()
        contact_vals = {field: vals[field] for field in contact_fields if field in vals}
        if contact_vals:
            self.with_context(__update_contact_lock=True).write(contact_vals)

    def _fields_sync(self, update_values):
        """Sync commercial fields and address fields from company and to
        children, contact fields from contact and to attached contact
        after create/update, just as if those were all modeled as
        fields.related to the parent
        """
        self.ensure_one()
        super(ResPartner, self)._fields_sync(update_values)
        contact_fields = self._contact_fields()
        # 1. From UPSTREAM: sync from parent contact
        if update_values.get("contact_id"):
            self._contact_sync_from_parent()
        # 2. To DOWNSTREAM: sync contact fields to parent or related
        elif any(field in contact_fields for field in update_values):
            update_ids = self.other_contact_ids.filtered(lambda p: not p.is_company)
            if self.contact_id:
                update_ids |= self.contact_id
            update_ids.update_contact(update_values)

    @api.onchange("contact_id")
    def _onchange_contact_id(self):
        if self.contact_id:
            self.name = self.contact_id.name

    @api.onchange("contact_type")
    def _onchange_contact_type(self):
        if self.contact_type == "standalone":
            self.contact_id = False