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

from dateutil.relativedelta import relativedelta

from odoo import api, fields, models


class FpSds(models.Model):
    """Safety Data Sheet library entry.

    A Safety Data Sheet (SDS) is a 16-section document supplied by a chemical
    manufacturer that describes the hazards, handling, storage, exposure
    controls and emergency information for a product. Under the WHMIS 2015 /
    GHS framework an SDS is considered current for three years from its
    issue date — after which a refresh from the supplier is required.

    Each SDS in the library carries supplier metadata, hazard classification,
    GHS pictogram codes, language coverage and a link to the original PDF
    via ir.attachment.
    """
    _name = 'fusion.plating.sds'
    _description = 'Fusion Plating — Safety Data Sheet'
    _inherit = ['mail.thread', 'mail.activity.mixin']
    _order = 'product_name, version desc, issue_date desc'
    _rec_name = 'name'

    name = fields.Char(
        string='Reference',
        required=True,
        tracking=True,
        help='Internal reference for this SDS entry, often the product name.',
    )
    product_name = fields.Char(
        string='Product Name',
        tracking=True,
    )
    supplier_name = fields.Char(
        string='Supplier (Text)',
        tracking=True,
        help='Free-text supplier name as printed on the SDS, used when '
             'no res.partner record exists yet.',
    )
    supplier_id = fields.Many2one(
        'res.partner',
        string='Supplier',
        tracking=True,
    )
    cas_number = fields.Char(
        string='CAS Number',
        tracking=True,
    )
    version = fields.Char(
        string='Version',
        tracking=True,
    )
    issue_date = fields.Date(
        string='Issue Date',
        tracking=True,
    )
    expiry_date = fields.Date(
        string='Expiry Date',
        compute='_compute_expiry_date',
        store=True,
        tracking=True,
        help='Computed as issue date + 3 years per WHMIS / GHS rule. '
             'Refresh from the supplier is required before this date.',
    )
    state = fields.Selection(
        [
            ('current', 'Current'),
            ('expiring_soon', 'Expiring Soon'),
            ('expired', 'Expired'),
            ('withdrawn', 'Withdrawn'),
        ],
        string='Status',
        compute='_compute_state',
        store=True,
        tracking=True,
    )
    hazard_class = fields.Selection(
        [
            ('flammable', 'Flammable'),
            ('oxidizer', 'Oxidizer'),
            ('compressed_gas', 'Compressed Gas'),
            ('corrosive', 'Corrosive'),
            ('toxic', 'Toxic'),
            ('carcinogen', 'Carcinogen'),
            ('reproductive_toxin', 'Reproductive Toxin'),
            ('sensitizer', 'Sensitizer'),
            ('aquatic_toxin', 'Aquatic Toxin'),
            ('other', 'Other'),
        ],
        string='Primary Hazard Class',
        tracking=True,
    )
    ghs_pictograms = fields.Char(
        string='GHS Pictograms',
        help='Comma-separated GHS pictogram codes, e.g. GHS01,GHS02,GHS05.',
    )
    language = fields.Selection(
        [
            ('en', 'English'),
            ('fr', 'French'),
            ('both', 'Bilingual (EN/FR)'),
        ],
        string='Language',
        default='en',
    )
    attachment_id = fields.Many2one(
        'ir.attachment',
        string='SDS Document',
        help='The original SDS PDF supplied by the manufacturer.',
    )
    notes = fields.Html(
        string='Notes',
    )
    withdrawn = fields.Boolean(
        string='Withdrawn',
        tracking=True,
        help='Manually mark this SDS as withdrawn (e.g. product discontinued).',
    )
    active = fields.Boolean(default=True)

    company_id = fields.Many2one(
        'res.company',
        string='Company',
        default=lambda self: self.env.company,
    )

    chemical_ids = fields.One2many(
        'fusion.plating.chemical',
        'sds_id',
        string='Chemicals',
    )
    chemical_count = fields.Integer(
        compute='_compute_chemical_count',
    )

    # ==========================================================================
    # Computes
    # ==========================================================================
    @api.depends('issue_date')
    def _compute_expiry_date(self):
        for rec in self:
            if rec.issue_date:
                rec.expiry_date = rec.issue_date + relativedelta(years=3)
            else:
                rec.expiry_date = False

    @api.depends('expiry_date', 'withdrawn')
    def _compute_state(self):
        today = fields.Date.context_today(self)
        warn_window = today + relativedelta(months=3)
        for rec in self:
            if rec.withdrawn:
                rec.state = 'withdrawn'
            elif not rec.expiry_date:
                rec.state = 'current'
            elif rec.expiry_date < today:
                rec.state = 'expired'
            elif rec.expiry_date <= warn_window:
                rec.state = 'expiring_soon'
            else:
                rec.state = 'current'

    def _compute_chemical_count(self):
        for rec in self:
            rec.chemical_count = len(rec.chemical_ids)

    # ==========================================================================
    # Actions
    # ==========================================================================
    def action_mark_withdrawn(self):
        self.write({'withdrawn': True})

    def action_mark_active(self):
        self.write({'withdrawn': False})