# Part of Odoo. See LICENSE file for full copyright and licensing details.
"""
Wizard: Загрузка перевода из локального хранилища.

Scans the module's own ``translations/<lang>/*.po`` folder, lists each found
file, lets the user drop unwanted rows, and applies the remaining PO files to
the current database using the same ``translation.remote.service.apply_po``
pipeline as the remote wizard.  Dropping a row only excludes it from this run —
the file on disk is never deleted.
"""
import logging
import os
from datetime import datetime

import polib

from odoo import _, api, fields, models
from odoo.exceptions import UserError
from odoo.modules.module import get_module_path

_logger = logging.getLogger(__name__)


class LocalTranslationSyncLine(models.TransientModel):
    _name = "translation.local.sync.line"
    _description = "Строка локальной загрузки перевода"

    wizard_id = fields.Many2one(
        "translation.local.sync.wizard",
        string="Визард",
        required=True,
        ondelete="cascade",
    )
    module_name = fields.Char(
        string="Модуль",
        readonly=True,
    )
    file_path = fields.Char(
        string="Путь",
        readonly=True,
    )
    file_date = fields.Datetime(
        string="Дата файла",
        readonly=True,
    )


class LocalTranslationSyncWizard(models.TransientModel):
    _name = "translation.local.sync.wizard"
    _description = "Загрузка перевода из локального хранилища"

    language = fields.Many2one(
        "res.lang",
        string="Язык",
        required=True,
        default=lambda self: self.env["res.lang"].search(
            [("code", "=", "ru_RU")], limit=1
        ),
    )
    line_ids = fields.One2many(
        "translation.local.sync.line",
        "wizard_id",
        string="Файлы переводов",
    )
    overwrite = fields.Boolean(
        string="Перезаписать существующие переводы",
        default=True,
        help="Заменять уже имеющиеся переводы значениями из локальных PO-файлов",
    )
    state = fields.Selection(
        [("form", "Форма"), ("done", "Готово")],
        default="form",
        readonly=True,
    )
    result_message = fields.Text(
        string="Результат",
        readonly=True,
    )

    # ------------------------------------------------------------------
    # Scan helpers
    # ------------------------------------------------------------------

    @api.model
    def _scan_local_po(self, lang):
        """Scan ``translations/<folder>/*.po`` for *lang* and return a list of
        ``(0, 0, vals)`` command tuples for the one2many ``line_ids``.

        The on-disk folder name is derived from the language's ``iso_code``
        (falling back to the first segment of its ``code``), matching the
        layout written by this module (e.g. ``ru`` for ``ru_RU``).
        """
        if not lang:
            return []
        base = get_module_path("translation_helper", display_warning=False)
        if not base:
            return []
        folder = lang.iso_code or (lang.code or "").split("_")[0]
        if not folder:
            return []
        po_dir = os.path.join(base, "translations", folder)
        if not os.path.isdir(po_dir):
            return []

        commands = []
        for fname in sorted(os.listdir(po_dir)):
            if not fname.endswith(".po"):
                continue
            full = os.path.join(po_dir, fname)
            if not os.path.isfile(full):
                continue
            mtime = datetime.fromtimestamp(os.path.getmtime(full))
            commands.append((0, 0, {
                "module_name": fname[:-3],
                "file_path": full,
                "file_date": fields.Datetime.to_string(mtime),
            }))
        return commands

    @api.model
    def default_get(self, fields_list):
        defaults = super().default_get(fields_list)
        res_lang = self.env["res.lang"].browse(defaults.get("language"))
        if not res_lang:
            res_lang = self.env["res.lang"].search(
                [("code", "=", "ru_RU")], limit=1
            )
        defaults["line_ids"] = self._scan_local_po(res_lang)
        defaults.setdefault("language", res_lang.id)
        return defaults

    @api.onchange("language")
    def _onchange_language(self):
        """Rebuild the file list when the selected language changes."""
        if self.language:
            self.line_ids = [(5, 0, 0)] + self._scan_local_po(self.language)

    # ------------------------------------------------------------------
    # Actions
    # ------------------------------------------------------------------

    def action_rescan(self):
        """Server-side rescan of the local folder for the chosen language."""
        self.ensure_one()
        self.line_ids = [(5, 0, 0)] + self._scan_local_po(self.language)
        return self._reopen()

    def action_sync(self):
        """Read each remaining PO file and apply it via the shared service."""
        self.ensure_one()
        if not self.line_ids:
            raise UserError(_("Нет файлов для загрузки."))

        service = self.env["translation.remote.service"]
        lang_code = self.language.code

        modules = []
        total_entries = 0
        translated_entries = 0
        errors = []

        for line in self.line_ids:
            try:
                with open(line.file_path, "rb") as fh:
                    po_bytes = fh.read()
                service.apply_po(po_bytes, lang_code, overwrite=self.overwrite)

                po = polib.pofile(po_bytes.decode("utf-8", errors="replace"))
                total_entries += len(po)
                translated_entries += sum(1 for e in po if e.msgstr and e.msgid)
                modules.append(line.module_name)
            except Exception as exc:  # noqa: BLE001 - isolate per-file failures
                _logger.exception(
                    "Local translation import failed for %s", line.file_path
                )
                errors.append(_("%(module)s: %(err)s",
                                module=line.module_name, err=exc))

        msg = _(
            "Загрузка завершена!\n\n"
            "Файлов обработано: %(files)d\n"
            "Модули: %(modules)s\n"
            "Язык: %(lang)s\n"
            "Переводов в файлах: %(total)d\n"
            "Из них переведено: %(translated)d\n"
            "Перезапись: %(overwrite)s",
            files=len(modules),
            modules=", ".join(modules) or _("нет"),
            lang=self.language.name,
            total=total_entries,
            translated=translated_entries,
            overwrite=_("да") if self.overwrite else _("нет"),
        )
        if errors:
            msg += "\n\n" + _("Ошибки:") + "\n" + "\n".join(errors)

        self.write({"result_message": msg, "state": "done"})
        _logger.info(
            "Local translation sync completed for %s (lang=%s)",
            modules, lang_code,
        )
        return self._reopen()

    # ------------------------------------------------------------------
    # Helpers
    # ------------------------------------------------------------------

    def _reopen(self):
        """Return action that re-opens this wizard record."""
        return {
            "name": _("Загрузка перевода из локального хранилища"),
            "type": "ir.actions.act_window",
            "res_model": self._name,
            "res_id": self.id,
            "view_mode": "form",
            "target": "new",
        }