# -*- coding: utf-8 -*-
# Copyright 2026 Nexa Systems Inc.
# License OPL-1 (Odoo Proprietary License v1.0)

from odoo import api, fields, models


class FpSensor(models.Model):
    """Individual measurement point.

    Each sensor represents a specific thing being measured at a specific
    location, e.g. "Tank SP-7 pH" or "Waste Water Treatment pH".
    Linked to a work centre (station) and/or tank for traceability.
    UUID field enables IoT device integration.
    """
    _name = 'fp.sensor'
    _description = 'Fusion Plating — Sensor'
    _inherit = ['mail.thread', 'mail.activity.mixin']
    _order = 'name'

    name = fields.Char(
        string='Name',
        required=True,
        tracking=True,
        help='Descriptive name, e.g. "Waste Water Treatment pH".',
    )
    uuid = fields.Char(
        string='UUID',
        index=True,
        copy=False,
        help='Hardware identifier for IoT devices.',
    )
    unit = fields.Char(
        string='Unit',
        help='Display unit for readings, e.g. "ph", "%", "g/L", "PPM", "L".',
    )
    sensor_type_id = fields.Many2one(
        'fp.sensor.type',
        string='Sensor Type',
        required=True,
        ondelete='restrict',
        tracking=True,
    )
    measurement_type = fields.Selection(
        related='sensor_type_id.measurement_type',
        string='Measurement Type',
        store=True,
        readonly=True,
    )
    work_center_id = fields.Many2one(
        'fusion.plating.work.center',
        string='Station',
        ondelete='set null',
        help='The work centre / station this sensor is attached to.',
    )
    tank_id = fields.Many2one(
        'fusion.plating.tank',
        string='Tank',
        ondelete='set null',
    )
    facility_id = fields.Many2one(
        'fusion.plating.facility',
        string='Facility',
        ondelete='set null',
    )
    location_name = fields.Char(
        string='Location',
        help='Free-text location, e.g. "WaterTreatmentArea", "PLANT1.TankLine".',
    )
    use_location = fields.Boolean(
        string='Use Location?',
        default=False,
    )

    # -- Computed from latest measurement --
    last_value = fields.Float(
        string='Last Measurement',
        compute='_compute_last_measurement',
        store=True,
    )
    last_value_text = fields.Char(
        string='Last Text Value',
        compute='_compute_last_measurement',
        store=True,
    )
    last_measured = fields.Datetime(
        string='Last Measured',
        compute='_compute_last_measurement',
        store=True,
    )

    measurement_ids = fields.One2many(
        'fp.sensor.measurement',
        'sensor_id',
        string='Measurements',
    )
    measurement_count = fields.Integer(
        string='Measurement Count',
        compute='_compute_measurement_count',
    )
    active = fields.Boolean(default=True)
    company_id = fields.Many2one(
        'res.company',
        string='Company',
        default=lambda self: self.env.company,
    )

    _sql_constraints = [
        ('uuid_uniq', 'unique(uuid)',
         'A sensor with this UUID already exists.'),
    ]

    @api.depends(
        'measurement_ids',
        'measurement_ids.value',
        'measurement_ids.value_text',
        'measurement_ids.effective_at',
    )
    def _compute_last_measurement(self):
        for sensor in self:
            latest = self.env['fp.sensor.measurement'].search(
                [('sensor_id', '=', sensor.id)],
                order='effective_at desc, id desc',
                limit=1,
            )
            if latest:
                sensor.last_value = latest.value
                sensor.last_value_text = latest.value_text
                sensor.last_measured = latest.effective_at
            else:
                sensor.last_value = 0.0
                sensor.last_value_text = False
                sensor.last_measured = False

    def action_quick_measure(self):
        """Open the quick measurement wizard."""
        self.ensure_one()
        return {
            'type': 'ir.actions.act_window',
            'name': 'Record Measurement',
            'res_model': 'fp.sensor.measure.wizard',
            'view_mode': 'form',
            'target': 'new',
            'context': {'default_sensor_id': self.id},
        }

    def action_view_measurements(self):
        """Open measurement list filtered to this sensor."""
        self.ensure_one()
        return {
            'type': 'ir.actions.act_window',
            'name': f'Measurements — {self.name}',
            'res_model': 'fp.sensor.measurement',
            'view_mode': 'list,form',
            'domain': [('sensor_id', '=', self.id)],
            'context': {'default_sensor_id': self.id},
        }

    def _compute_measurement_count(self):
        data = self.env['fp.sensor.measurement']._read_group(
            [('sensor_id', 'in', self.ids)],
            ['sensor_id'],
            ['__count'],
        )
        mapped = {sensor.id: count for sensor, count in data}
        for sensor in self:
            sensor.measurement_count = mapped.get(sensor.id, 0)