import logging
import time

from aiogram import Router, F
from aiogram.types import Message

from bot.utils.ai_client import ask_ai
from bot.utils.database import (
    add_context_message,
    get_user_context,
    get_or_create_dialogue,
    increment_dialogue_count,
    reset_dialogue_to_phase2,
    block_dialogue,
    is_ai_blocked,
    save_chat_user,
    clear_user_context,
)
from bot.utils.memory import find_relevant_summaries, save_summary_with_embedding, generate_summary
from config import AI_CONTEXT_LIMIT, AI_DIALOGUE_LIMIT, AI_PHASE2_LIMIT, AI_COOLDOWN

logger = logging.getLogger(__name__)

router = Router()


@router.message(F.text, F.reply_to_message.as_("replied"))
async def handle_dialogue_reply(message: Message, replied: Message):
    user_id = message.from_user.id
    chat_id = message.chat.id

    await save_chat_user(user_id, chat_id, message.from_user.username, message.from_user.full_name or "")

    if await is_ai_blocked(user_id, chat_id):
        return

    replied_from_bot = replied.from_user and replied.from_user.is_bot

    if not replied_from_bot:
        return

    dialogue = await get_or_create_dialogue(user_id, chat_id)

    if not dialogue["is_active"]:
        return

    count_result = await increment_dialogue_count(user_id, chat_id)
    current_count = count_result["msg_count"]
    phase = dialogue["phase"]

    logger.info("Dialogue msg | user=%d chat=%d phase=%d count=%d", user_id, chat_id, phase, current_count)

    if phase == 1:
        limit = AI_DIALOGUE_LIMIT
    else:
        limit = AI_PHASE2_LIMIT

    if current_count > limit:
        if phase == 1:
            logger.info("Dialogue phase1→2 | user=%d chat=%d msg_count=%d", user_id, chat_id, current_count)
            await _transition_to_phase2(message, user_id, chat_id)
        else:
            logger.info("Dialogue ended | user=%d chat=%d msg_count=%d", user_id, chat_id, current_count)
            await _end_dialogue(message, user_id, chat_id)
        return

    if phase == 1:
        context_limit = AI_DIALOGUE_LIMIT
    else:
        context_limit = AI_PHASE2_LIMIT

    context_messages = await get_user_context(user_id, chat_id, limit=context_limit)

    extra_context = ""
    try:
        relevant = await find_relevant_summaries(user_id, chat_id, message.text or "", top_k=2)
        if relevant:
            extra_context = "\n\nИз прошлых диалогов:\n" + "\n---\n".join(relevant[:2])
    except Exception as e:
        logger.error("Error fetching relevant summaries: %s", e)

    remaining = limit - current_count
    warning = ""
    if remaining <= 5:
        warning = f"\n\n⚠️ Осталось {remaining} сообщений в этом диалоге."

    system_prompt_extra = ""
    if extra_context:
        system_prompt_extra += extra_context
    if warning:
        system_prompt_extra += warning

    message_text = message.text or ""
    if system_prompt_extra:
        message_text += "\n\n(Контекст)" + system_prompt_extra

    status_msg = await message.answer("✍️", parse_mode=None)

    async def update_status(text: str):
        try:
            await status_msg.edit_text(text, parse_mode=None)
        except Exception:
            pass

    response = await ask_ai(
        message_text,
        context_messages,
        status_callback=update_status,
    )

    if not response:
        response = "Не могу ответить сейчас."

    await add_context_message(user_id, chat_id, message.text or "", "user")
    await add_context_message(user_id, chat_id, response, "assistant")

    try:
        await message.reply(response, parse_mode="HTML", disable_web_page_preview=True)
    except Exception:
        await message.reply(response, parse_mode=None, disable_web_page_preview=True)

    try:
        await status_msg.delete()
    except Exception:
        pass

    if remaining <= 3 and remaining > 0:
        try:
            warn_msg = await message.reply(
                f"⚠️ Осталось {remaining} сообщений. Память почти заполнена.",
                parse_mode=None,
            )
        except Exception:
            pass


async def _transition_to_phase2(message: Message, user_id: int, chat_id: int):
    status_msg = await message.answer("Сохраняю выжимку диалога...", parse_mode=None)

    try:
        context = await get_user_context(user_id, chat_id, limit=AI_DIALOGUE_LIMIT)
        if context and len(context) >= 4:
            summary = await generate_summary(context)
            if summary:
                await save_summary_with_embedding(user_id, chat_id, summary)
                await clear_user_context(user_id, chat_id)
    except Exception as e:
        logger.error("Error saving summary: %s", e)

    await reset_dialogue_to_phase2(user_id, chat_id)

    try:
        await status_msg.edit_text("✅ Начинаю новую сессию (осталось 20 сообщений).", parse_mode=None)
    except Exception:
        pass


async def _end_dialogue(message: Message, user_id: int, chat_id: int):
    context = await get_user_context(user_id, chat_id, limit=AI_PHASE2_LIMIT)
    if context and len(context) >= 4:
        try:
            summary = await generate_summary(context)
            if summary:
                await save_summary_with_embedding(user_id, chat_id, summary)
        except Exception as e:
            logger.error("Error saving final summary: %s", e)

    await block_dialogue(user_id, chat_id, AI_COOLDOWN)

    await message.reply("Твой лимит исчерпан. Возвращайся через час.", parse_mode=None)