# utils/core.py

import asyncio
import aiohttp
import re

import globals
from langchain_community.vectorstores import FAISS
from langchain.text_splitter import CharacterTextSplitter, RecursiveCharacterTextSplitter
from langchain.schema import Document


async def switch_model(model_name: str, timeout: int = 600):
    if globals.current_model == model_name:
        print(f"🔁 Model '{model_name}' already loaded.")
        return

    # Unload all other models to clear VRAM
    async with aiohttp.ClientSession() as session:
        async with session.get(f"{globals.OLLAMA_URL}/api/show") as resp:
            if resp.status == 200:
                data = await resp.json()
                loaded_models = data.get("models", [])
                for model in loaded_models:
                    if model["name"] != model_name:
                        print(f"🔁 Unloading model: {model['name']}")
                        await session.post(f"{globals.OLLAMA_URL}/api/stop", json={"name": model["name"]})
            else:
                print("⚠️ Failed to check currently loaded models.")

    print(f"🔄 Switching to model '{model_name}'...")
    async with aiohttp.ClientSession() as session:
        await session.post(f"{globals.OLLAMA_URL}/api/stop")
    # Warm up the new model (dummy call to preload it)
    payload = {
        "model": model_name,
        "prompt": "Hello",
        "stream": False
    }
    headers = {"Content-Type": "application/json"}

    # Poll until /api/generate returns 200
    async with aiohttp.ClientSession() as session:
        for _ in range(timeout):
            async with session.post(f"{globals.OLLAMA_URL}/api/generate", json=payload, headers=headers) as resp:
                if resp.status == 200:
                    globals.current_model = model_name
                    print(f"✅ Model {model_name} ready!")
                    return
            await asyncio.sleep(1)  # Wait a second before trying again

    raise TimeoutError(f"Timed out waiting for model '{model_name}' to become available.")


async def is_miku_addressed(message) -> bool:
    # If message contains a ping for Miku, return true
    if message.guild.me in message.mentions:
        return True

    # If message is a reply, check the referenced message author
    if message.reference:
        try:
            referenced_msg = await message.channel.fetch_message(message.reference.message_id)
            if referenced_msg.author == message.guild.me:  # or globals.client.user if you use client
                return True
        except Exception as e:
            print(f"⚠️ Could not fetch referenced message: {e}")

    cleaned = message.content.strip()

    return bool(re.search(
        r'(?<![\w\(])(?:[^\w\s]{0,2}\s*)?miku(?:\s*[^\w\s]{0,2})?(?=,|\s*,|[!\.?\s]*$)',
        cleaned,
        re.IGNORECASE
    ))

# Load and index once at startup
def load_miku_knowledge():
    with open("miku_lore.txt", "r", encoding="utf-8") as f:
        text = f.read()

    from langchain.text_splitter import RecursiveCharacterTextSplitter

    text_splitter = RecursiveCharacterTextSplitter(
        chunk_size=520,
        chunk_overlap=50,
        separators=["\n\n", "\n", ".", "!", "?", ",", " ", ""]
    )

    docs = [Document(page_content=chunk) for chunk in text_splitter.split_text(text)]

    vectorstore = FAISS.from_documents(docs, globals.embeddings)
    return vectorstore

def load_miku_lyrics():
    with open("miku_lyrics.txt", "r", encoding="utf-8") as f:
        lyrics_text = f.read()

    text_splitter = CharacterTextSplitter(chunk_size=520, chunk_overlap=50)
    docs = [Document(page_content=chunk) for chunk in text_splitter.split_text(lyrics_text)]

    vectorstore = FAISS.from_documents(docs, globals.embeddings)
    return vectorstore

miku_vectorstore = load_miku_knowledge()
miku_lyrics_vectorstore = load_miku_lyrics()