"""Bridge documents.document to accounting moves.

Adds a Many2one link to the created invoice/move, a computed
``is_invoice_candidate`` flag for PDFs/images that have not yet been
turned into a vendor bill, and the ``action_create_invoice`` entry
point used by both the form button and the server action.
"""

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


INVOICE_CANDIDATE_MIMETYPES = (
    'application/pdf',
    'image/png',
    'image/jpeg',
    'image/jpg',
)


class DocumentsDocument(models.Model):
    _inherit = 'documents.document'

    move_id = fields.Many2one(
        'account.move',
        string='Linked Invoice/Move',
        copy=False,
        ondelete='set null',
        help="The accounting move this document was used to create.",
    )
    is_invoice_candidate = fields.Boolean(
        string='Is Invoice Candidate',
        compute='_compute_is_invoice_candidate',
        store=True,
        help="True when this document looks like a vendor bill "
             "(PDF/image binary) and has not yet been linked to a move.",
    )

    @api.depends('mimetype', 'type', 'move_id')
    def _compute_is_invoice_candidate(self):
        for d in self:
            d.is_invoice_candidate = (
                d.type == 'binary'
                and (d.mimetype or '') in INVOICE_CANDIDATE_MIMETYPES
                and not d.move_id
            )

    def action_create_invoice(self):
        """Open the wizard to create a vendor invoice from this document."""
        self.ensure_one()
        if self.move_id:
            raise UserError(_(
                "This document is already linked to invoice %s.",
                self.move_id.display_name,
            ))
        if self.type == 'folder':
            raise UserError(_(
                "Folders cannot be turned into invoices."
            ))
        if (self.mimetype or '') not in INVOICE_CANDIDATE_MIMETYPES:
            raise UserError(_(
                "Only PDF or image documents can be turned into invoices."
            ))
        return {
            'type': 'ir.actions.act_window',
            'name': _('Create Invoice from Document'),
            'res_model': 'fusion.create.invoice.from.document.wizard',
            'view_mode': 'form',
            'target': 'new',
            'context': {'default_document_id': self.id},
        }