from aiogram import Router, F
from aiogram.filters import CommandStart, Command
from aiogram.types import (
    Message,
    InlineKeyboardMarkup,
    InlineKeyboardButton,
    CallbackQuery,
    ReplyKeyboardMarkup,
    KeyboardButton,
)
from aiogram.fsm.context import FSMContext

from database.db import async_session_maker
from services.user_service import UserService
from utils.i18n import t
from utils.levels import get_user_level_for_language

router = Router()

def main_menu_keyboard(lang: str = 'ru') -> ReplyKeyboardMarkup:
    """Клавиатура с основными командами (кнопки отправляют команды)."""
    return ReplyKeyboardMarkup(
        resize_keyboard=True,
        keyboard=[
            [
                KeyboardButton(text=t(lang, "menu.add")),
                KeyboardButton(text=t(lang, "menu.vocab")),
            ],
            [
                KeyboardButton(text=t(lang, "menu.task")),
                KeyboardButton(text=t(lang, "menu.practice")),
            ],
            [
                KeyboardButton(text=t(lang, "menu.words")),
                KeyboardButton(text=t(lang, "menu.import")),
            ],
            [
                KeyboardButton(text=t(lang, "menu.stats")),
                KeyboardButton(text=t(lang, "menu.settings")),
            ],
        ],
    )


@router.message(CommandStart())
async def cmd_start(message: Message, state: FSMContext):
    """Обработчик команды /start"""
    async with async_session_maker() as session:
        # Проверяем, существует ли пользователь
        existing_user = await UserService.get_user_by_telegram_id(session, message.from_user.id)
        is_new_user = existing_user is None

        # Создаём или получаем пользователя
        user = await UserService.get_or_create_user(
            session,
            telegram_id=message.from_user.id,
            username=message.from_user.username
        )

        lang = (user.language_interface or 'ru')

        if is_new_user:
            # Новый пользователь
            await message.answer(
                t(lang, "start.new_intro", first_name=message.from_user.first_name),
                reply_markup=main_menu_keyboard(lang),
            )

            # Предлагаем пройти тест уровня
            keyboard = InlineKeyboardMarkup(inline_keyboard=[
                [InlineKeyboardButton(text=t(lang, 'start.offer_btn'), callback_data="offer_level_test")],
                [InlineKeyboardButton(text=t(lang, 'start.skip_btn'), callback_data="skip_level_test")]
            ])

            await message.answer(t(lang, "start.offer_test"), reply_markup=keyboard)
        else:
            # Существующий пользователь
            await message.answer(
                t(lang, "start.return", first_name=message.from_user.first_name),
                reply_markup=main_menu_keyboard(lang),
            )


@router.message(Command("menu"))
async def cmd_menu(message: Message):
    """Показать клавиатуру с основными командами."""
    # Определяем язык пользователя
    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, message.from_user.id)
    lang = (user.language_interface if user else 'ru') or 'ru'
    await message.answer(t(lang, "menu.below"), reply_markup=main_menu_keyboard(lang))


# Обработчики кнопок главного меню (по тексту)

def _menu_match(key: str):
    labels = {t('ru', key), t('en', key), t('ja', key)}
    return lambda m: m.text in labels


@router.message(_menu_match('menu.add'))
async def btn_add_pressed(message: Message, state: FSMContext):
    from bot.handlers.vocabulary import AddWordStates
    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, message.from_user.id)
    lang = (user.language_interface if user else 'ru') or 'ru'
    await message.answer(t(lang, 'add.prompt'))
    await state.set_state(AddWordStates.waiting_for_word)


@router.message(_menu_match('menu.vocab'))
async def btn_vocab_pressed(message: Message):
    from bot.handlers.vocabulary import cmd_vocabulary
    await cmd_vocabulary(message)


@router.message(_menu_match('menu.task'))
async def btn_task_pressed(message: Message, state: FSMContext):
    from bot.handlers.tasks import cmd_task
    await cmd_task(message, state)


@router.message(_menu_match('menu.practice'))
async def btn_practice_pressed(message: Message, state: FSMContext):
    from bot.handlers.practice import cmd_practice
    await cmd_practice(message, state)


@router.message(_menu_match('menu.import'))
async def btn_import_pressed(message: Message, state: FSMContext):
    from bot.handlers.import_text import cmd_import
    await cmd_import(message, state)


@router.message(_menu_match('menu.stats'))
async def btn_stats_pressed(message: Message):
    from bot.handlers.tasks import cmd_stats
    await cmd_stats(message)


@router.message(_menu_match('menu.settings'))
async def btn_settings_pressed(message: Message):
    from bot.handlers.settings import cmd_settings
    await cmd_settings(message)


@router.message(_menu_match('menu.words'))
async def btn_words_pressed(message: Message, state: FSMContext):
    """Подсказать про тематические слова и показать быстрые темы."""
    from aiogram.types import InlineKeyboardMarkup, InlineKeyboardButton

    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, message.from_user.id)
    lang = (user.language_interface if user else 'ru') or 'ru'
    text = (
        t(lang, 'words.help_title') + "\n\n" +
        t(lang, 'words.help_usage') + "\n\n" +
        t(lang, 'words.popular')
    )
    keyboard = InlineKeyboardMarkup(inline_keyboard=[
        [InlineKeyboardButton(text=t(lang, 'words.topic_travel'), callback_data="menu_theme_travel")],
        [InlineKeyboardButton(text=t(lang, 'words.topic_food'), callback_data="menu_theme_food")],
        [InlineKeyboardButton(text=t(lang, 'words.topic_work'), callback_data="menu_theme_work")],
        [InlineKeyboardButton(text=t(lang, 'words.topic_nature'), callback_data="menu_theme_nature")],
        [InlineKeyboardButton(text=t(lang, 'words.topic_technology'), callback_data="menu_theme_technology")],
    ])
    await message.answer(text, reply_markup=keyboard)


@router.callback_query(F.data.startswith("menu_theme_"))
async def pick_theme_from_menu(callback: CallbackQuery, state: FSMContext):
    """Сгенерировать слова по выбранной теме из меню и показать список."""
    from database.db import async_session_maker
    from services.user_service import UserService
    from services.ai_service import ai_service
    from bot.handlers.words import show_words_list, WordsStates

    # Сразу отвечаем на callback, чтобы избежать таймаута
    await callback.answer()
    theme = callback.data.split("menu_theme_")[-1]

    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, callback.from_user.id)
        if not user:
            await callback.answer(t('ru', 'common.start_first'), show_alert=True)
            return

        lang = (user.language_interface or 'ru')
        current_level = get_user_level_for_language(user)
        generating = await callback.message.answer(t(lang, 'words.generating', theme=theme))
        words = await ai_service.generate_thematic_words(
            theme=theme,
            level=current_level,
            count=10,
            learning_lang=user.learning_language,
            translation_lang=user.language_interface,
        )
        await generating.delete()

        if not words:
            await callback.message.answer(t(lang, 'words.generate_failed'))
            return

        # Сохраняем в состояние как в /words
        await state.update_data(theme=theme, words=words, user_id=user.id, level=current_level)
        await state.set_state(WordsStates.viewing_words)

        await show_words_list(callback.message, words, theme)


@router.message(Command("help"))
async def cmd_help(message: Message):
    """Обработчик команды /help"""
    # Определяем язык пользователя
    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, message.from_user.id)
    lang = (user.language_interface if user else 'ru') or 'ru'
    await message.answer(t(lang, "start.help"))


@router.callback_query(F.data == "offer_level_test")
async def offer_level_test_callback(callback: CallbackQuery, state: FSMContext):
    """Начать тест уровня из приветствия"""
    from bot.handlers.level_test import start_level_test
    await callback.message.delete()
    await start_level_test(callback.message, state)
    await callback.answer()


@router.callback_query(F.data == "skip_level_test")
async def skip_level_test_callback(callback: CallbackQuery):
    """Пропустить тест уровня"""
    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, callback.from_user.id)
    lang = (user.language_interface if user else 'ru') or 'ru'
    await callback.message.edit_text(t(lang, 'start.skip_msg'))
    await callback.answer()