"""Persisted anomaly flags from the engine's variance detection.

Each row captures one flagged report row variance. Used by the OWL
anomaly_strip + the audit trail."""

from odoo import _, api, fields, models


SEVERITY = [('low', 'Low'), ('medium', 'Medium'), ('high', 'High')]
DIRECTION = [('increase', 'Increase'), ('decrease', 'Decrease')]


class FusionReportAnomaly(models.Model):
    _name = "fusion.report.anomaly"
    _description = "Flagged Report Variance"
    _order = "detected_at desc, severity desc"

    report_id = fields.Many2one('fusion.report', required=True, ondelete='cascade')
    company_id = fields.Many2one('res.company', required=True,
                                 default=lambda self: self.env.company)
    period_from = fields.Date(required=True)
    period_to = fields.Date(required=True)

    row_id = fields.Char(required=True, help="Engine-generated row id (e.g. 'line_3').")
    label = fields.Char(required=True)
    current_amount = fields.Float()
    comparison_amount = fields.Float()
    variance_amount = fields.Float()
    variance_pct = fields.Float()
    severity = fields.Selection(SEVERITY, required=True)
    direction = fields.Selection(DIRECTION, required=True)

    detected_at = fields.Datetime(default=fields.Datetime.now, required=True)
    state = fields.Selection([
        ('new', 'New'),
        ('acknowledged', 'Acknowledged'),
        ('investigating', 'Investigating'),
        ('resolved', 'Resolved'),
        ('dismissed', 'Dismissed'),
    ], default='new', required=True)
    notes = fields.Text()
    acknowledged_by = fields.Many2one('res.users')
    acknowledged_at = fields.Datetime()

    def action_acknowledge(self):
        self.write({
            'state': 'acknowledged',
            'acknowledged_by': self.env.uid,
            'acknowledged_at': fields.Datetime.now(),
        })

    def action_dismiss(self):
        self.write({'state': 'dismissed'})

    def action_resolve(self):
        self.write({'state': 'resolved'})