# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1 (Odoo Proprietary License v1.0)
# Part of the Fusion Plating product family.

from odoo import api, fields, models


class FpBatchChemistry(models.Model):
    """A single chemistry reading taken during batch processing."""
    _name = 'fusion.plating.batch.chemistry'
    _description = 'Batch Chemistry Reading'
    _order = 'reading_time desc, id desc'

    batch_id = fields.Many2one(
        'fusion.plating.batch',
        string='Batch',
        required=True,
        ondelete='cascade',
    )
    parameter_id = fields.Many2one(
        'fusion.plating.bath.parameter',
        string='Parameter',
        required=True,
    )
    value = fields.Float(string='Value', required=True)
    reading_time = fields.Datetime(
        string='Reading Time',
        default=fields.Datetime.now,
    )
    status = fields.Selection(
        selection=[
            ('pass', 'Pass'),
            ('warning', 'Warning'),
            ('fail', 'Fail'),
        ],
        string='Status',
        compute='_compute_status',
        store=True,
    )
    notes = fields.Char(string='Notes')

    @api.depends('parameter_id', 'value')
    def _compute_status(self):
        """Compare value against parameter target range.

        Uses the parameter's default target range and warning tolerance.
        A reading within [target_min, target_max] is a pass. If it falls
        within the warning tolerance band outside that range, it is a
        warning. Otherwise it is a fail.
        """
        for rec in self:
            if not rec.parameter_id:
                rec.status = 'pass'
                continue
            param = rec.parameter_id
            target_min = param.target_min
            target_max = param.target_max
            if not target_min and not target_max:
                rec.status = 'pass'
                continue
            # Value within target range = pass
            if target_min <= rec.value <= target_max:
                rec.status = 'pass'
                continue
            # Calculate warning band from tolerance %
            tolerance = (param.warning_tolerance or 0.0) / 100.0
            span = target_max - target_min if target_max != target_min else abs(target_max) or 1.0
            margin = span * tolerance
            warning_min = target_min - margin
            warning_max = target_max + margin
            if warning_min <= rec.value <= warning_max:
                rec.status = 'warning'
            else:
                rec.status = 'fail'