from aiogram import Router, F
from aiogram.filters import Command
from aiogram.types import Message, InlineKeyboardMarkup, InlineKeyboardButton, CallbackQuery
from aiogram.fsm.context import FSMContext
from aiogram.fsm.state import State, StatesGroup

from database.db import async_session_maker
from database.models import WordSource
from services.user_service import UserService
from services.vocabulary_service import VocabularyService
from services.ai_service import ai_service
from utils.i18n import t
from utils.levels import get_user_level_for_language

router = Router()


class WordsStates(StatesGroup):
    """Состояния для работы с тематическими подборками"""
    viewing_words = State()


@router.message(Command("words"))
async def cmd_words(message: Message, state: FSMContext):
    """Обработчик команды /words [тема]"""
    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, message.from_user.id)

        if not user:
            await message.answer(t('ru', 'common.start_first'))
            return

        # Извлекаем тему из команды
        command_parts = message.text.split(maxsplit=1)

        if len(command_parts) < 2:
            lang = user.language_interface or 'ru'
            help_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')
            )
            await message.answer(help_text)
            return

        theme = command_parts[1].strip()
        await generate_words_for_theme(message, state, theme, message.from_user.id)


async def generate_words_for_theme(message: Message, state: FSMContext, theme: str, user_id: int):
    """Генерация слов по теме (вызывается из cmd_words и callback)"""
    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, user_id)

        # Показываем индикатор генерации
        lang = user.language_interface or 'ru'
        generating_msg = await message.answer(t(lang, 'words.generating', theme=theme))

        # Генерируем слова через AI
        current_level = get_user_level_for_language(user)
        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_msg.delete()

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

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

        # Показываем подборку
        await show_words_list(message, words, theme)


async def show_words_list(message: Message, words: list, theme: str):
    """Показать список слов с кнопками для добавления"""

    # Определяем язык интерфейса для заголовка/подсказок
    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.header', theme=theme) + "\n\n"

    for idx, word_data in enumerate(words, 1):
        text += (
            f"{idx}. <b>{word_data['word']}</b> "
            f"[{word_data.get('transcription', '')}]\n"
            f"   {word_data['translation']}\n"
            f"   <i>{word_data.get('example', '')}</i>\n\n"
        )

    text += t(lang, 'words.choose')

    # Создаем кнопки для каждого слова (по 2 в ряд)
    keyboard = []
    for idx, word_data in enumerate(words):
        button = InlineKeyboardButton(
            text=f"➕ {word_data['word']}",
            callback_data=f"add_word_{idx}"
        )

        # Добавляем по 2 кнопки в ряд
        if len(keyboard) == 0 or len(keyboard[-1]) == 2:
            keyboard.append([button])
        else:
            keyboard[-1].append(button)

    # Кнопка "Добавить все"
    keyboard.append([
        InlineKeyboardButton(text=t(lang, 'words.add_all_btn'), callback_data="add_all_words")
    ])

    # Кнопка "Закрыть"
    keyboard.append([
        InlineKeyboardButton(text=t(lang, 'words.close_btn'), callback_data="close_words")
    ])

    reply_markup = InlineKeyboardMarkup(inline_keyboard=keyboard)
    await message.answer(text, reply_markup=reply_markup)


@router.callback_query(F.data.startswith("add_word_"), WordsStates.viewing_words)
async def add_single_word(callback: CallbackQuery, state: FSMContext):
    """Добавить одно слово из подборки"""
    # Отвечаем сразу, операция может занять время
    await callback.answer()
    word_index = int(callback.data.split("_")[2])

    data = await state.get_data()
    words = data.get('words', [])
    user_id = data.get('user_id')

    if word_index >= len(words):
        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.answer(t(lang, 'words.err_not_found'))
        return

    word_data = words[word_index]

    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, callback.from_user.id)
        # Проверяем, нет ли уже такого слова
        existing = await VocabularyService.get_word_by_original(
            session, user_id, word_data['word']
        )

        if existing:
            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.answer(t(lang, 'words.already_exists', word=word_data['word']), show_alert=True)
            return

        # Добавляем слово
        # Формируем examples с учётом языков
        learn = user.learning_language if user else 'en'
        ui = user.language_interface if user else 'ru'
        ex = word_data.get('example')
        examples = ([{learn: ex, ui: ''}] if ex else [])

        await VocabularyService.add_word(
            session=session,
            user_id=user_id,
            word_original=word_data['word'],
            word_translation=word_data['translation'],
            source_lang=user.learning_language if user else None,
            translation_lang=user.language_interface if user else None,
            transcription=word_data.get('transcription'),
            examples=examples,
            source=WordSource.SUGGESTED,
            category=data.get('theme', 'general'),
            difficulty_level=data.get('level')
        )

    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.answer(t(lang, 'words.added_single', word=word_data['word']))


@router.callback_query(F.data == "add_all_words", WordsStates.viewing_words)
async def add_all_words(callback: CallbackQuery, state: FSMContext):
    """Добавить все слова из подборки"""
    # Сразу отвечаем на callback, так как добавление может занять время
    await callback.answer()
    data = await state.get_data()
    words = data.get('words', [])
    user_id = data.get('user_id')
    theme = data.get('theme', 'general')

    added_count = 0
    skipped_count = 0

    async with async_session_maker() as session:
        user = await UserService.get_user_by_telegram_id(session, callback.from_user.id)
        for word_data in words:
            # Проверяем, нет ли уже такого слова
            existing = await VocabularyService.get_word_by_original(
                session, user_id, word_data['word']
            )

            if existing:
                skipped_count += 1
                continue

            # Добавляем слово
            learn = user.learning_language if user else 'en'
            ui = user.language_interface if user else 'ru'
            ex = word_data.get('example')
            examples = ([{learn: ex, ui: ''}] if ex else [])

            await VocabularyService.add_word(
                session=session,
                user_id=user_id,
                word_original=word_data['word'],
                word_translation=word_data['translation'],
                source_lang=user.learning_language if user else None,
                translation_lang=user.language_interface if user else None,
                transcription=word_data.get('transcription'),
                examples=examples,
                source=WordSource.SUGGESTED,
                category=theme,
                difficulty_level=data.get('level')
            )
            added_count += 1

    result_text = f"✅ Добавлено слов: <b>{added_count}</b>"
    if skipped_count > 0:
        result_text += f"\n⚠️ Пропущено (уже в словаре): {skipped_count}"

    await callback.message.edit_reply_markup(reply_markup=None)
    await callback.message.answer(result_text)
    await state.clear()


@router.callback_query(F.data == "close_words", WordsStates.viewing_words)
async def close_words(callback: CallbackQuery, state: FSMContext):
    """Закрыть подборку слов"""
    await callback.message.delete()
    await state.clear()
    await callback.answer()