import os
import pandas as pd
from datasets import Dataset
from transformers import AutoTokenizer, AutoConfig
from datetime import datetime
from huggingface_hub import HfApi, create_repo, upload_folder, hf_hub_download
import traceback
import threading
import uvicorn
import time
from fastapi import FastAPI
from fastapi.responses import JSONResponse

# === Sabitler ===
MODEL_NAME = "mistralai/Mistral-7B-Instruct-v0.2"
HF_TOKEN = os.getenv("HF_TOKEN")
SOURCE_DATASET_ID = "UcsTurkey/turkish-general-culture-chunks"
TRAIN_TARGET_DATASET_ID = "UcsTurkey/turkish-general-culture-tokenized"
BUFFER_SIZE = 5
START_CHUNK_NUMBER = 0
PROCESS_CHUNK_COUNT = 776

CHUNK_FOLDER = "/data/chunks"
PARQUET_FOLDER = "/data/tokenized_chunks"
CACHE_DIR = "/data/.hf_cache"

os.makedirs(CHUNK_FOLDER, exist_ok=True)
os.makedirs(PARQUET_FOLDER, exist_ok=True)
os.makedirs(CACHE_DIR, exist_ok=True)

# ✅ Health check sunucusu
app = FastAPI()

@app.get("/")
def health():
    return JSONResponse(content={"status": "ok"})

def run_health_server():
    uvicorn.run(app, host="0.0.0.0", port=7860)

threading.Thread(target=run_health_server, daemon=True).start()

# 🕒 Zamanlı log fonksiyonu
def log(message):
    timestamp = datetime.now().strftime("%H:%M:%S")
    print(f"[{timestamp}] {message}")
    os.sys.stdout.flush()

# === Tokenizer ===
os.environ["HF_HOME"] = CACHE_DIR
log(f"🔁 Tokenizer yükleniyor: {MODEL_NAME}")
tokenizer = AutoTokenizer.from_pretrained(MODEL_NAME, use_fast=False, cache_dir=CACHE_DIR)
if tokenizer.pad_token is None:
    log("ℹ️ pad_token tanımlı değil, eos_token atanıyor.")
    tokenizer.pad_token = tokenizer.eos_token

config = AutoConfig.from_pretrained(MODEL_NAME, cache_dir=CACHE_DIR)
MAX_LEN = getattr(config, "max_position_embeddings", 2048)

# === Hugging Face API ===
api = HfApi()
files = api.list_repo_files(repo_id=SOURCE_DATASET_ID, repo_type="dataset", token=HF_TOKEN)
csv_files = sorted([f for f in files if f.endswith(".csv")])
selected_files = csv_files[START_CHUNK_NUMBER:START_CHUNK_NUMBER + PROCESS_CHUNK_COUNT]

buffer_counter = 0

def tokenize(example):
    prompt = f"SORU: {example['instruction']}\nCEVAP: {example['output']}"
    tokenized = tokenizer(prompt, truncation=True, padding="max_length", max_length=MAX_LEN)
    tokenized["labels"] = [
        -100 if token_id == tokenizer.pad_token_id else token_id for token_id in tokenized["input_ids"]
    ]
    return tokenized

def upload_if_ready():
    global buffer_counter
    if os.listdir(PARQUET_FOLDER):
        log(f"⬆️ BUFFER doldu. Hugging Face'e yükleniyor: {TRAIN_TARGET_DATASET_ID}")
        create_repo(TRAIN_TARGET_DATASET_ID, repo_type="dataset", token=HF_TOKEN, exist_ok=True)
        upload_folder(repo_id=TRAIN_TARGET_DATASET_ID, folder_path=PARQUET_FOLDER, repo_type="dataset", token=HF_TOKEN)
        log("🧹 Upload sonrası klasör temizleniyor...")
        for f in os.listdir(PARQUET_FOLDER):
            os.remove(os.path.join(PARQUET_FOLDER, f))
        buffer_counter = 0

for idx, filename in enumerate(selected_files):
    log(f"\n📄 {idx+1}/{len(selected_files)} → {filename} işleniyor...")
    try:
        local_path = os.path.join(CHUNK_FOLDER, os.path.basename(filename))
        hf_hub_download(
            repo_id=SOURCE_DATASET_ID,
            filename=filename,
            local_dir=CHUNK_FOLDER,
            token=HF_TOKEN,
            repo_type="dataset"
        )
        df = pd.read_csv(local_path).dropna()
        df = df[df["question"].str.strip().astype(bool) & df["answer"].str.strip().astype(bool)]
        df = df.rename(columns={"question": "instruction", "answer": "output"})
        log(f"✅ Geçerli satır sayısı: {len(df)}")

        dataset = Dataset.from_pandas(df[["instruction", "output"]])
        tokenized_dataset = dataset.map(tokenize)
        parquet_path = os.path.join(PARQUET_FOLDER, filename.replace(".csv", ".parquet"))
        tokenized_dataset.to_parquet(parquet_path, compression="snappy")
        log(f"🎯 Tokenized parquet kaydedildi: {parquet_path}")
        buffer_counter += 1
        if buffer_counter >= BUFFER_SIZE:
            upload_if_ready()
    except Exception as e:
        log(f"❌ Hata oluştu: {filename} → {e}")
        traceback.print_exc()
        continue

upload_if_ready()

log("✅ Tüm işlemler tamamlandı. Servis bekleme modunda...")
while True:
    time.sleep(60)