"""/start, /help, /menu, main menu buttons and in-section navigation."""

from aiogram import F, Router
from aiogram.filters import Command, CommandStart
from aiogram.fsm.context import FSMContext
from aiogram.types import CallbackQuery, Message

from app.bot.menu import Nav, NavAction, Section, main_menu, section_by_button, section_nav
from app.texts import Texts


def build_router(texts: Texts, admin_ids: frozenset[int]) -> Router:
    router = Router(name="common")
    sections = section_by_button(texts)
    section_text = {
        Section.COMMIT: texts.section.commit,
        Section.STATUS: texts.section.status,
        Section.LOGS: texts.section.logs,
        Section.ALERTS: texts.section.alerts,
        Section.MEMBERS: texts.section.members,
    }

    def is_admin(message: Message) -> bool:
        return message.from_user is not None and message.from_user.id in admin_ids

    @router.message(CommandStart())
    async def start(message: Message, state: FSMContext) -> None:
        await state.clear()
        await message.answer(texts.start.welcome, reply_markup=main_menu(texts, is_admin=is_admin(message)))

    @router.message(Command("menu"))
    async def menu(message: Message, state: FSMContext) -> None:
        await state.clear()
        await message.answer(texts.menu.placeholder, reply_markup=main_menu(texts, is_admin=is_admin(message)))

    @router.message(Command("help"))
    async def help_(message: Message) -> None:
        await message.answer(texts.help.text)

    @router.message(F.text.in_(sections))
    async def open_section(message: Message, state: FSMContext) -> None:
        section = sections[message.text or ""]
        if section is Section.MEMBERS and not is_admin(message):
            return
        await state.clear()
        await message.answer(section_text[section], reply_markup=section_nav(texts))

    @router.callback_query(Nav.filter())
    async def navigate(query: CallbackQuery, callback_data: Nav, state: FSMContext) -> None:
        # At a section's root "Back" and "Cancel" both close it; nested screens will override "Back" per section.
        await state.clear()
        text = texts.section.cancelled if callback_data.action is NavAction.CANCEL else texts.menu.placeholder
        if isinstance(query.message, Message):
            await query.message.edit_text(text)
        await query.answer()

    return router