#!/usr/bin/env python3
"""Sync PostgreSQL backups to HuggingFace Xet Dataset"""

import os
import sys
import time
import subprocess
import signal
from datetime import datetime
from pathlib import Path

SYNC_INTERVAL = int(os.environ.get('SYNC_INTERVAL', 300))
HF_TOKEN = os.environ.get('HF_TOKEN', '')
XET_DATASET = os.environ.get('XET_DATASET', '')

running = True

def log(msg):
    print(f"[{datetime.now().strftime('%H:%M:%S')}] {msg}", flush=True)

def wait_for_postgres(retries=30):
    for i in range(retries):
        result = subprocess.run(
            ['pg_isready', '-h', 'localhost', '-p', '5432'],
            capture_output=True
        )
        if result.returncode == 0:
            log("✅ PostgreSQL ready")
            return True
        time.sleep(2)
    return False

def backup_and_upload():
    if not HF_TOKEN or not XET_DATASET:
        log("⚠️  HF_TOKEN or XET_DATASET not set")
        return
    
    try:
        backup_dir = Path('/data/backup')
        backup_dir.mkdir(parents=True, exist_ok=True)
        backup_file = backup_dir / 'pg_backup.sql'
        
        # Create backup
        result = subprocess.run(
            ['pg_dump', '-h', 'localhost', '-U', 'postgres', '-d', 'appdb', 
             '--clean', '--if-exists', '-f', str(backup_file)],
            capture_output=True, text=True
        )
        
        if result.returncode != 0:
            log(f"❌ Backup failed: {result.stderr}")
            return
        
        log(f"✅ Backup created ({backup_file.stat().st_size} bytes)")
        
        # Upload to HuggingFace
        from huggingface_hub import HfApi, create_repo
        
        api = HfApi(token=HF_TOKEN)
        
        try:
            create_repo(XET_DATASET, repo_type="dataset", private=True, 
                       token=HF_TOKEN, exist_ok=True)
        except:
            pass
        
        api.upload_file(
            path_or_fileobj=str(backup_file),
            path_in_repo="backup/pg_backup.sql",
            repo_id=XET_DATASET,
            repo_type="dataset",
            token=HF_TOKEN,
            commit_message=f"Backup {datetime.now().isoformat()}"
        )
        
        log(f"✅ Uploaded to {XET_DATASET}")
        
    except Exception as e:
        log(f"❌ Error: {e}")

def signal_handler(signum, frame):
    global running
    log("🛑 Shutting down, final backup...")
    running = False
    backup_and_upload()
    sys.exit(0)

def main():
    log("🚀 Sync Manager started")
    log(f"📦 Dataset: {XET_DATASET or 'NOT SET'}")
    log(f"⏰ Interval: {SYNC_INTERVAL}s")
    
    signal.signal(signal.SIGTERM, signal_handler)
    signal.signal(signal.SIGINT, signal_handler)
    
    if not wait_for_postgres():
        log("❌ PostgreSQL not available")
        return
    
    time.sleep(30)  # Initial delay
    
    while running:
        backup_and_upload()
        for _ in range(SYNC_INTERVAL):
            if not running:
                break
            time.sleep(1)

if __name__ == '__main__':
    main()