# -*- coding: utf-8 -*-
# Copyright 2024-2026 Nexa Systems Inc.
# License OPL-1 (Odoo Proprietary License v1.0)

"""QR sticker generator (CL17).

Generates a printable PDF with one sticker per selected serial number.
Each sticker has a QR code linking to /repair?sn=<serial>. Stick on the
equipment; client scans -> public client portal opens with the unit
pre-filled.

Accessible from stock.lot via a server action AND as a standalone wizard
under Fusion Repairs > Configuration.
"""

import base64
import io
import logging

from odoo import _, api, fields, models
from odoo.exceptions import UserError

_logger = logging.getLogger(__name__)


class FusionRepairQRStickerWizard(models.TransientModel):
    _name = 'fusion.repair.qr.sticker.wizard'
    _description = 'QR Sticker Generator Wizard'

    lot_ids = fields.Many2many(
        'stock.lot',
        string='Serials',
        help='One sticker will be generated per serial.',
    )
    product_id = fields.Many2one(
        'product.product',
        string='Filter by Product',
        help='Optional - limits the serial picker to lots of this product.',
    )
    company_id = fields.Many2one(
        'res.company',
        default=lambda self: self.env.company,
    )

    def action_generate(self):
        self.ensure_one()
        if not self.lot_ids:
            raise UserError(_('Select at least one serial number to print stickers for.'))
        return self.env.ref('fusion_repairs.action_report_qr_stickers') \
            .report_action(self)

    # ------------------------------------------------------------------
    # Helpers used by the QWeb report
    # ------------------------------------------------------------------
    def _portal_base_url(self):
        ICP = self.env['ir.config_parameter'].sudo()
        base = (ICP.get_param('web.base.url', '') or '').rstrip('/')
        path = ICP.get_param('fusion_repairs.client_portal_url', '/repair') or '/repair'
        return base + path

    def get_sticker_url(self, lot):
        """Return the full URL that the QR code on this sticker encodes."""
        url = self._portal_base_url()
        serial = (lot.name or '').strip()
        return f"{url}?sn={serial}" if serial else url

    def get_qr_data_uri(self, url, size=180):
        """Return a base64 PNG data URI for the QR code of the given URL.

        Uses the `qrcode` library if available (it's a transitive dep of many
        Odoo modules); falls back to a simple ASCII placeholder if not so the
        report still renders (with a warning).
        """
        try:
            import qrcode
            img = qrcode.make(url)
            buf = io.BytesIO()
            img.save(buf, format='PNG')
            b64 = base64.b64encode(buf.getvalue()).decode('ascii')
            return f"data:image/png;base64,{b64}"
        except Exception as e:
            _logger.warning('QR sticker generation failed for %s: %s', url, e)
            return ""