"""Вкладка Сервисы: systemd-юниты, журнал."""
import flet as ft

from app.core import systemd_svc as sd
from app.core.ssh import SSHClient
from app.db.models import Server
from app.ui.components import confirm_dialog, snack


class SystemdTab(ft.Column):
    def __init__(self, page: ft.Page, srv: Server):
        super().__init__(expand=True, spacing=8)
        self._page = page
        self.srv = srv
        self._units = []

        self.search = ft.TextField(hint_text="Поиск юнита…", prefix_icon=ft.Icons.SEARCH,
                                   on_change=lambda e: self._render(), expand=True, dense=True)
        self.only_failed = ft.Checkbox(label="только failed", value=False,
                                       on_change=lambda e: self._render())
        self.table = ft.DataTable(columns=[
            ft.DataColumn(ft.Text("Юнит")),
            ft.DataColumn(ft.Text("Состояние")),
            ft.DataColumn(ft.Text("Enabled")),
            ft.DataColumn(ft.Text("Описание")),
            ft.DataColumn(ft.Text("Действия")),
        ], rows=[])
        self.log_text = ft.Column(scroll=ft.ScrollMode.AUTO, spacing=1)

        self.controls = [
            ft.Container(height=8),
            ft.Row([
                ft.OutlinedButton("Обновить", icon=ft.Icons.REFRESH,
                                  on_click=lambda e: self._page.run_task(self._load)),
                self.search, self.only_failed,
            ]),
            ft.Row([
                ft.Container(expand=3, content=ft.Column([self.table],
                             scroll=ft.ScrollMode.AUTO)),
                ft.VerticalDivider(width=1),
                ft.Container(expand=2, content=self.log_text),
            ], expand=True),
        ]
        self._page.run_task(self._load)

    async def _load(self):
        try:
            async with SSHClient(self.srv) as c:
                self._units = await sd.list_units(c)
        except Exception as e:
            snack(self._page, f"systemd: {e}", error=True)
        self._render()

    def _render(self):
        q = (self.search.value or "").lower()
        units = self._units
        if self.only_failed.value:
            units = [u for u in units if u.active == "failed"]
        if q:
            units = [u for u in units if q in u.name.lower() or q in u.description.lower()]

        def state_color(u):
            return {"active": ft.Colors.GREEN_300, "failed": ft.Colors.RED_400,
                    "inactive": ft.Colors.GREY_500}.get(u.active, ft.Colors.GREY_500)

        self.table.rows = [
            ft.DataRow(cells=[
                ft.DataCell(ft.Text(u.name, size=12, selectable=True)),
                ft.DataCell(ft.Text(f"{u.active}/{u.sub}", size=12, color=state_color(u))),
                ft.DataCell(ft.Text(u.enabled or "—", size=11)),
                ft.DataCell(ft.Text(u.description[:50], size=11)),
                ft.DataCell(ft.Row([
                    ft.IconButton(ft.Icons.PLAY_ARROW, icon_size=16, tooltip="start",
                                  on_click=lambda e, n=u.name: self._act(n, "start")),
                    ft.IconButton(ft.Icons.STOP, icon_size=16, tooltip="stop",
                                  on_click=lambda e, n=u.name: self._act(n, "stop")),
                    ft.IconButton(ft.Icons.RESTART_ALT, icon_size=16, tooltip="restart",
                                  on_click=lambda e, n=u.name: self._act(n, "restart")),
                    ft.IconButton(ft.Icons.ARTICLE, icon_size=16, tooltip="логи",
                                  on_click=lambda e, n=u.name: self._logs(n)),
                ], spacing=0)),
            ]) for u in units[:200]
        ]
        self._page.update()

    def _act(self, name, action):
        def do():
            async def _d():
                try:
                    async with SSHClient(self.srv) as c:
                        await sd.action(c, name, action)
                    snack(self._page, f"{name}: {action} ✓")
                    await self._load()
                except Exception as ex:
                    snack(self._page, f"{ex}", error=True)
            self._page.run_task(_d)
        if name in sd.CRITICAL_UNITS and action in ("stop", "restart"):
            confirm_dialog(self._page, f"⚠ {action} {name}?",
                           "Это критичный системный сервис! Можно потерять связь с сервером.", do)
        else:
            do()

    def _logs(self, name):
        async def _l():
            self.log_text.controls = [ft.Text(f"journalctl -u {name}", weight=ft.FontWeight.BOLD, size=12)]
            self._page.update()
            try:
                async with SSHClient(self.srv) as c:
                    out = await sd.logs(c, name)
                for line in out.splitlines()[-80:]:
                    self.log_text.controls.append(
                        ft.Text(line, size=10, font_family="Consolas", selectable=True))
            except Exception as ex:
                self.log_text.controls.append(ft.Text(f"ошибка: {ex}", size=11))
            self._page.update()
        self._page.run_task(_l)