# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1
from odoo import fields, models


class FusionBillingMetric(models.Model):
    """A billable metric (CPU-seconds, API calls, messages, tokens ...).

    Defines how raw usage is aggregated within a billing period. See spec §5.1 / §6.
    """

    _name = "fusion.billing.metric"
    _description = "Fusion Billing — Billable Metric"
    _order = "code"

    name = fields.Char(required=True)
    code = fields.Char(required=True, index=True)
    aggregation = fields.Selection(
        [
            ("sum", "Sum"),
            ("max", "Max"),
            ("last", "Last value"),
            ("unique_count", "Unique count"),
        ],
        default="sum", required=True,
    )
    unit_label = fields.Char(help="e.g. CPU-seconds, API calls, messages, tokens.")
    rounding = fields.Float(default=1.0)
    active = fields.Boolean(default=True)

    _code_uniq = models.Constraint("unique(code)", "Metric code must be unique.")