# Part of Odoo. See LICENSE file for full copyright and licensing details.
"""
Service for fetching translations from a remote Odoo 19 instance.

Odoo 16+ / 19 stores translations in JSONB columns, not in ir.translation.
The only reliable cross-version way to export / import translations is through
the standard PO pipeline:

    Remote:  base.language.export  → PO bytes (base64)
    Local:   TranslationImporter   → write JSONB values

This module automates the whole round-trip via XML-RPC.
"""
import base64
import logging
import tempfile
from xmlrpc.client import ServerProxy

from odoo import _, api, models
from odoo.exceptions import UserError
from odoo.tools.translate import TranslationImporter

_logger = logging.getLogger(__name__)


class RemoteTranslationService(models.AbstractModel):
    _name = "translation.remote.service"
    _description = "Remote Translation Service"

    # ------------------------------------------------------------------
    # Remote connection helpers
    # ------------------------------------------------------------------

    @api.model
    def _rpc_authenticate(self, url, db, user, password):
        """Authenticate on remote Odoo via XML-RPC.  Returns uid."""
        common = ServerProxy(f"{url}/xmlrpc/2/common")
        try:
            uid = common.authenticate(db, user, password, {})
        except Exception as exc:
            raise UserError(
                _("Could not connect to %(url)s:\n%(err)s",
                  url=url, err=exc)
            ) from exc
        if not uid:
            raise UserError(
                _("Authentication failed for user '%(user)s' on database '%(db)s'.",
                  user=user, db=db)
            )
        return uid

    @api.model
    def _rpc_object(self, url, db, uid, password):
        """Return a ServerProxy pointing at /xmlrpc/2/object."""
        return ServerProxy(f"{url}/xmlrpc/2/object")

    # ------------------------------------------------------------------
    # Public API
    # ------------------------------------------------------------------

    @api.model
    def fetch_po_from_remote(self, remote_url, remote_db, remote_user,
                             remote_password, module_names, lang_code):
        """
        Connect to remote Odoo and export PO for *module_names* / *lang_code*.

        Returns
        -------
        bytes
            Raw PO file content (decoded from base64).
        """
        if not all([remote_url, remote_db, remote_user, remote_password]):
            raise UserError(_("Не заполнены все поля подключения к удалённому серверу."))
        if not module_names:
            raise UserError(_("Выберите хотя бы один модуль."))

        remote_url = remote_url.rstrip("/")
        uid = self._rpc_authenticate(remote_url, remote_db,
                                     remote_user, remote_password)
        obj = self._rpc_object(remote_url, remote_db, uid, remote_password)

        _logger.info(
            "Remote export: modules=%s  lang=%s  url=%s  db=%s",
            module_names, lang_code, remote_url, remote_db,
        )

        try:
            # 1. Find module ids on remote
            remote_module_ids = obj.execute_kw(
                remote_db, uid, remote_password,
                "ir.module.module", "search",
                [[("name", "in", module_names), ("state", "=", "installed")]],
            )
            if not remote_module_ids:
                raise UserError(
                    _("На удалённом сервере не найдены установленные модули: %s")
                    % ", ".join(module_names)
                )

            # 2. Create export wizard on remote
            wiz_id = obj.execute_kw(
                remote_db, uid, remote_password,
                "base.language.export", "create",
                [{
                    "lang": lang_code,
                    "format": "po",
                    "export_type": "module",
                    "modules": [(6, 0, remote_module_ids)],
                }],
            )

            # 3. Execute act_getfile — generates the PO and stores in data field
            obj.execute_kw(
                remote_db, uid, remote_password,
                "base.language.export", "act_getfile",
                [[wiz_id]],
            )

            # 4. Read the resulting base64 data
            result = obj.execute_kw(
                remote_db, uid, remote_password,
                "base.language.export", "read",
                [[wiz_id], ["data", "name"]],
            )
            if not result or not result[0].get("data"):
                raise UserError(
                    _("Удалённый сервер вернул пустой PO-файл.")
                )

            po_b64 = result[0]["data"]
            filename = result[0].get("name", "export.po")
            po_bytes = base64.b64decode(po_b64)

            _logger.info(
                "Fetched PO from remote: file=%s  size=%d bytes  modules=%s",
                filename, len(po_bytes), module_names,
            )
            return po_bytes, filename

        except UserError:
            raise
        except Exception as exc:
            _logger.exception("Remote PO export failed")
            raise UserError(
                _("Ошибка экспорта переводов с удалённого сервера:\n%s") % exc
            ) from exc

    @api.model
    def apply_po(self, po_bytes, lang_code, overwrite=True):
        """
        Import PO bytes into the current database using the standard
        TranslationImporter pipeline.

        Returns
        -------
        int
            Number of translation entries processed (approximate).
        """
        importer = TranslationImporter(self.env.cr)
        with tempfile.NamedTemporaryFile(suffix=".po", delete=True) as tmp:
            tmp.write(po_bytes)
            tmp.flush()
            tmp.seek(0)
            importer.load(tmp, "po", lang_code)

        importer.save(overwrite=overwrite)
        self.env.cr.precommit.run()       # flush pending writes

        _logger.info(
            "Applied PO (%d bytes) for lang=%s  overwrite=%s",
            len(po_bytes), lang_code, overwrite,
        )
        return len(po_bytes)

    @api.model
    def preview_po(self, po_bytes):
        """
        Parse a PO file and return a short textual preview.
        """
        import polib
        po = polib.pofile(po_bytes.decode("utf-8", errors="replace"))
        translated = [e for e in po if e.msgstr and e.msgid]

        lines = []
        lines.append(_("Всего записей: %d") % len(po))
        lines.append(_("Из них переведено: %d") % len(translated))
        lines.append("")
        lines.append("%-50s │ %s" % (_("Оригинал"), _("Перевод")))
        lines.append("─" * 50 + "─┼─" + "─" * 50)
        for entry in translated[:25]:
            src = (entry.msgid or "")[:50]
            val = (entry.msgstr or "")[:50]
            lines.append(f"{src:50s} │ {val}")
        if len(translated) > 25:
            lines.append("")
            lines.append(_("… и ещё %d записей") % (len(translated) - 25))

        return "\n".join(lines)