from odoo import fields, models


class IfcBom(models.Model):
    _name = 'grt.ifc.bom'
    _description = 'IFC Bill of Materials'
    _order = 'level, parent_id, sequence, id'

    project_id = fields.Many2one('grt.ifc.project', string='Project', required=True, ondelete='cascade')
    ifc_key = fields.Char(string='IFC Key', required=True, index=True)
    name = fields.Char(string='Name', required=True)
    global_id = fields.Char(string='GlobalId', index=True)
    ifc_type = fields.Char(string='IFC Type', required=True, default='IfcProduct', index=True)
    parent_id = fields.Many2one('grt.ifc.bom', string='Parent Item', ondelete='cascade', index=True)
    child_ids = fields.One2many('grt.ifc.bom', 'parent_id', string='Child Items')
    relation_type = fields.Char(string='Relation Type', readonly=True)
    level = fields.Integer(string='Level', default=0, readonly=True)
    sequence = fields.Integer(string='Sequence', default=10)
    quantity = fields.Float(string='Quantity', digits=(16, 4), default=1.0)
    unit_name = fields.Char(string='Unit', default='ea')