"""Резервное копирование: запуск, история, скачивание."""
import flet as ft

from app.core import backup as bk
from app.core import servers as servers_core
from app.core.tasks import tasks
from app.ui.components import append_log, log_view, snack


class BackupsPage(ft.Column):
    def __init__(self, page: ft.Page, go):
        super().__init__(expand=True, scroll=ft.ScrollMode.AUTO, spacing=12)
        self._page = page

        self.srv_dd = ft.Dropdown(label="Сервер", width=250, options=[
            ft.dropdown.Option(str(s.id), s.name) for s in servers_core.list_servers()
        ])
        self.paths_tf = ft.TextField(
            label="Пути (через пробел)", value="/etc", width=400,
            hint_text="/etc /home/user /var/www",
        )
        self.download_cb = ft.Checkbox(label="Скачать на этот ПК", value=True)
        self.log = log_view()
        self.log_container = ft.Container(
            height=180, border=ft.Border.all(1, ft.Colors.GREY_800),
            border_radius=8, padding=8, content=self.log, visible=False)
        self.table = ft.DataTable(columns=[
            ft.DataColumn(ft.Text("Дата")),
            ft.DataColumn(ft.Text("Сервер")),
            ft.DataColumn(ft.Text("Пути")),
            ft.DataColumn(ft.Text("Размер")),
            ft.DataColumn(ft.Text("Статус")),
            ft.DataColumn(ft.Text("Файл")),
        ], rows=[])

        count, size = bk.stats()
        self.stats_text = ft.Text(f"Всего бэкапов: {count}, суммарно {size/1048576:.1f} МБ",
                                  size=13, color=ft.Colors.GREY_500)

        self.controls = [
            ft.Text("Резервное копирование", size=28, weight=ft.FontWeight.BOLD),
            ft.Row([self.srv_dd, self.paths_tf, self.download_cb,
                    ft.FilledButton("Создать бэкап", icon=ft.Icons.BACKUP,
                                    on_click=self._run)]),
            self.stats_text,
            self.log_container,
            ft.Text("История", weight=ft.FontWeight.BOLD, size=16),
            ft.Card(content=ft.Container(padding=10, content=self.table)),
        ]
        self._reload()

    def _reload(self):
        servers = {s.id: s.name for s in servers_core.list_servers()}
        self.table.rows = []
        for r in bk.list_backups():
            color = ft.Colors.GREEN_300 if r.status == "success" else \
                    ft.Colors.RED_300 if r.status == "error" else ft.Colors.GREY_500
            self.table.rows.append(ft.DataRow(cells=[
                ft.DataCell(ft.Text(f"{r.created_at:%d.%m %H:%M}", size=11)),
                ft.DataCell(ft.Text(servers.get(r.server_id, "?"), size=12)),
                ft.DataCell(ft.Text(r.paths, size=11)),
                ft.DataCell(ft.Text(f"{r.size/1048576:.1f} МБ" if r.size else "—", size=11)),
                ft.DataCell(ft.Text(r.status, size=11, color=color)),
                ft.DataCell(ft.Text(r.file or "—", size=10, color=ft.Colors.GREY_500)),
            ]))
        self._page.update()

    def _run(self, e):
        if not self.srv_dd.value:
            snack(self._page, "Выберите сервер", error=True)
            return
        srv = servers_core.get_server(int(self.srv_dd.value))
        paths = self.paths_tf.value.strip()
        if not paths:
            snack(self._page, "Укажите пути", error=True)
            return
        self.log_container.visible = True
        self._page.update()

        async def job(log):
            rec = await bk.run_backup(srv, paths, self.download_cb.value, log)
            log(f"=== {rec.status} ===" if rec else "=== error ===")

        tasks.start("backup", f"бэкап {paths}", srv.id, job,
                    on_log=lambda l: (append_log(self.log, l), self._page.update()),
                    on_done=lambda r: self._reload())
        snack(self._page, "Бэкап запущен")