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 aiogram.fsm.state import State, StatesGroup

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

router = Router()


class OnboardingStates(StatesGroup):
    """Состояния онбординга для новых пользователей"""
    choosing_interface_lang = State()
    choosing_learning_lang = State()
    choosing_translation_lang = State()


def onboarding_interface_keyboard() -> InlineKeyboardMarkup:
    """Клавиатура выбора языка интерфейса при онбординге"""
    return InlineKeyboardMarkup(inline_keyboard=[
        [InlineKeyboardButton(text="🇷🇺 Русский", callback_data="onboard_interface_ru")],
        [InlineKeyboardButton(text="🇬🇧 English", callback_data="onboard_interface_en")],
        [InlineKeyboardButton(text="🇯🇵 日本語", callback_data="onboard_interface_ja")],
    ])


def onboarding_learning_keyboard(lang: str) -> InlineKeyboardMarkup:
    """Клавиатура выбора языка изучения при онбординге"""
    return InlineKeyboardMarkup(inline_keyboard=[
        [InlineKeyboardButton(text=t(lang, 'onboarding.lang_en'), callback_data="onboard_learning_en")],
        [InlineKeyboardButton(text=t(lang, 'onboarding.lang_ja'), callback_data="onboard_learning_ja")],
    ])


def onboarding_translation_keyboard(lang: str) -> InlineKeyboardMarkup:
    """Клавиатура выбора языка перевода при онбординге"""
    return InlineKeyboardMarkup(inline_keyboard=[
        [InlineKeyboardButton(text=t(lang, 'settings.lang_name.ru'), callback_data="onboard_translation_ru")],
        [InlineKeyboardButton(text=t(lang, 'settings.lang_name.en'), callback_data="onboard_translation_en")],
        [InlineKeyboardButton(text=t(lang, 'settings.lang_name.ja'), callback_data="onboard_translation_ja")],
    ])


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.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

        if is_new_user:
            # Новый пользователь - начинаем онбординг
            # Сначала создаём пользователя с дефолтными значениями
            user = await UserService.get_or_create_user(
                session,
                telegram_id=message.from_user.id,
                username=message.from_user.username
            )

            # Приветствие и первый вопрос - язык интерфейса
            await message.answer(
                f"👋 Welcome! / Привет! / ようこそ!\n\n"
                "🌐 Choose your interface language:\n"
                "🌐 Выбери язык интерфейса:\n"
                "🌐 インターフェース言語を選択:",
                reply_markup=onboarding_interface_keyboard()
            )
            await state.set_state(OnboardingStates.choosing_interface_lang)
            return

        # Существующий пользователь
        user = existing_user
        lang = (user.language_interface or 'ru')

        await message.answer(
            t(lang, "start.return", first_name=message.from_user.first_name),
            reply_markup=main_menu_keyboard(lang),
        )


# === Обработчики онбординга ===

@router.callback_query(F.data.startswith("onboard_interface_"), OnboardingStates.choosing_interface_lang)
async def onboard_set_interface(callback: CallbackQuery, state: FSMContext):
    """Установить язык интерфейса при онбординге"""
    lang = callback.data.split("_")[-1]  # ru | en | ja

    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, callback.from_user.id)
        if user:
            await UserService.update_user_language(session, user.id, lang)

    await state.update_data(interface_lang=lang)

    # Второй вопрос - язык изучения
    await callback.message.edit_text(
        t(lang, 'onboarding.step2_title'),
        reply_markup=onboarding_learning_keyboard(lang)
    )
    await state.set_state(OnboardingStates.choosing_learning_lang)
    await callback.answer()


@router.callback_query(F.data.startswith("onboard_learning_"), OnboardingStates.choosing_learning_lang)
async def onboard_set_learning(callback: CallbackQuery, state: FSMContext):
    """Установить язык изучения при онбординге"""
    learning_lang = callback.data.split("_")[-1]  # en | ja
    data = await state.get_data()
    lang = data.get('interface_lang', 'ru')

    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, callback.from_user.id)
        if user:
            await UserService.update_user_learning_language(session, user.id, learning_lang)

    await state.update_data(learning_lang=learning_lang)

    # Третий вопрос - язык перевода
    await callback.message.edit_text(
        t(lang, 'onboarding.step3_title'),
        reply_markup=onboarding_translation_keyboard(lang)
    )
    await state.set_state(OnboardingStates.choosing_translation_lang)
    await callback.answer()


@router.callback_query(F.data.startswith("onboard_translation_"), OnboardingStates.choosing_translation_lang)
async def onboard_set_translation(callback: CallbackQuery, state: FSMContext):
    """Установить язык перевода при онбординге и завершить"""
    translation_lang = callback.data.split("_")[-1]  # ru | en | ja
    data = await state.get_data()
    lang = data.get('interface_lang', 'ru')

    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, callback.from_user.id)
        if user:
            await UserService.update_user_translation_language(session, user.id, translation_lang)

    await state.clear()

    # Приветствие с выбранными настройками
    await callback.message.edit_text(t(lang, 'onboarding.complete'))

    # Показываем главное меню и предлагаем тест уровня
    await callback.message.answer(
        t(lang, "start.new_intro", first_name=callback.from_user.first_name),
        reply_markup=main_menu_keyboard(lang),
    )

    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 callback.message.answer(t(lang, "start.offer_test"), reply_markup=keyboard)
    await callback.answer()


@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):
    """Показать меню добавления слов"""
    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'

    keyboard = InlineKeyboardMarkup(inline_keyboard=[
        [InlineKeyboardButton(text=t(lang, 'add_menu.manual'), callback_data="add_manual")],
        [InlineKeyboardButton(text=t(lang, 'add_menu.thematic'), callback_data="add_thematic")],
        [InlineKeyboardButton(text=t(lang, 'add_menu.import'), callback_data="add_import")]
    ])

    await message.answer(t(lang, 'add_menu.title'), reply_markup=keyboard)


@router.callback_query(F.data == "add_manual")
async def add_manual_callback(callback: CallbackQuery, state: FSMContext):
    """Добавить слово вручную"""
    await callback.answer()
    from bot.handlers.vocabulary import AddWordStates

    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 state.set_state(AddWordStates.waiting_for_word)
    await callback.message.edit_text(t(lang, 'add.prompt'))


@router.callback_query(F.data == "add_thematic")
async def add_thematic_callback(callback: CallbackQuery):
    """Тематические слова"""
    await callback.answer()
    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'

    # Показываем подсказку по использованию /words
    text = (
        t(lang, 'words.help_title') + "\n\n" +
        t(lang, 'words.help_usage') + "\n\n" +
        t(lang, 'words.help_examples') + "\n\n" +
        t(lang, 'words.help_note')
    )

    # Популярные темы как кнопки
    keyboard = InlineKeyboardMarkup(inline_keyboard=[
        [
            InlineKeyboardButton(text=t(lang, 'words.topic_travel'), callback_data="words_travel"),
            InlineKeyboardButton(text=t(lang, 'words.topic_food'), callback_data="words_food")
        ],
        [
            InlineKeyboardButton(text=t(lang, 'words.topic_work'), callback_data="words_work"),
            InlineKeyboardButton(text=t(lang, 'words.topic_technology'), callback_data="words_technology")
        ],
        [InlineKeyboardButton(text="⬅️ " + t(lang, 'settings.back'), callback_data="back_to_add_menu")]
    ])

    await callback.message.edit_text(text, reply_markup=keyboard)


@router.callback_query(F.data.startswith("words_"))
async def words_topic_callback(callback: CallbackQuery, state: FSMContext):
    """Генерация слов по теме"""
    topic = callback.data.replace("words_", "")
    await callback.answer()
    await callback.message.delete()

    from bot.handlers.words import generate_words_for_theme
    await generate_words_for_theme(callback.message, state, topic, callback.from_user.id)


@router.callback_query(F.data == "add_import")
async def add_import_callback(callback: CallbackQuery):
    """Показать меню импорта"""
    await callback.answer()
    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'

    keyboard = InlineKeyboardMarkup(inline_keyboard=[
        [InlineKeyboardButton(text=t(lang, 'import_menu.from_text'), callback_data="import_from_text")],
        [InlineKeyboardButton(text=t(lang, 'import_menu.from_file'), callback_data="import_from_file")],
        [InlineKeyboardButton(text="⬅️ " + t(lang, 'settings.back'), callback_data="back_to_add_menu")]
    ])

    await callback.message.edit_text(t(lang, 'import_menu.title'), reply_markup=keyboard)


@router.callback_query(F.data == "back_to_add_menu")
async def back_to_add_menu_callback(callback: CallbackQuery):
    """Вернуться в меню добавления"""
    await callback.answer()
    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'

    keyboard = InlineKeyboardMarkup(inline_keyboard=[
        [InlineKeyboardButton(text=t(lang, 'add_menu.manual'), callback_data="add_manual")],
        [InlineKeyboardButton(text=t(lang, 'add_menu.thematic'), callback_data="add_thematic")],
        [InlineKeyboardButton(text=t(lang, 'add_menu.import'), callback_data="add_import")]
    ])

    await callback.message.edit_text(t(lang, 'add_menu.title'), reply_markup=keyboard)


@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):
    """Показать меню импорта"""
    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'

    keyboard = InlineKeyboardMarkup(inline_keyboard=[
        [InlineKeyboardButton(text=t(lang, 'import_menu.from_text'), callback_data="import_from_text")],
        [InlineKeyboardButton(text=t(lang, 'import_menu.from_file'), callback_data="import_from_file")]
    ])

    await message.answer(t(lang, 'import_menu.title'), reply_markup=keyboard)


@router.callback_query(F.data == "import_from_text")
async def import_from_text_callback(callback: CallbackQuery, state: FSMContext):
    """Импорт из текста"""
    await callback.answer()
    from bot.handlers.import_text import ImportStates

    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.message.edit_text(t('ru', 'common.start_first'))
        return

    lang = user.language_interface or 'ru'
    await state.set_state(ImportStates.waiting_for_text)
    await callback.message.edit_text(
        t(lang, 'import.title') + "\n\n" +
        t(lang, 'import.desc') + "\n\n" +
        t(lang, 'import.can_send') + "\n\n" +
        t(lang, 'import.cancel_hint')
    )


@router.callback_query(F.data == "import_from_file")
async def import_from_file_callback(callback: CallbackQuery):
    """Импорт из файла"""
    await callback.answer()
    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, 'import_menu.file_hint'))


@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=get_user_translation_lang(user),
            user_id=user.id
        )
        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, user.id)


@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, telegram_id=callback.from_user.id)
    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()