from threading import Thread
from copy import deepcopy
from uuid import uuid4
from time import sleep
import json
import time
import re
import os


def syncmethod(func):
    def function(*args, **kwargs):
        th = Thread(target=func, args=args, kwargs=kwargs)
        th.start()
    return function


@syncmethod
def interval(fc, t):
    while True:
        sleep(t)
        fc()


class FileManager:
    def __init__(self, base_url: str, expires_minutes: int = 60):
        self.data_file = "collector_data.json"
        self.base_url  = base_url.rstrip("/")
        self.expires_minutes = expires_minutes
        os.makedirs("fl", exist_ok=True)
        if not os.path.exists(self.data_file):
            self._write_json()
        else:
            self.check_files()

    # ------------------------------------------------------------------
    def _format_path(self, path: str) -> str:
        p = re.sub(r'\s+', '-', path)
        p = re.sub(r'[!?#*Ççêwrong_char]', '', p)
        return p

    def _read_json(self) -> list:
        with open(self.data_file, "r") as f:
            return json.load(f)

    def _write_json(self, data: list = None):
        with open(self.data_file, "w") as f:
            json.dump(data or [], f, indent=2)

    # ------------------------------------------------------------------
    def start(self, gap_minutes: int = 5):
        interval(self.check_files, gap_minutes * 60)

    def check_files(self):
        data = self._read_json()
        now  = time.time()
        keep = []
        for entry in data:
            if entry["expiresAt"] < now:
                try:
                    os.remove(entry["path"])
                except Exception as e:
                    print(f"[cleanup] {e}")
            else:
                keep.append(entry)
        self._write_json(keep)

    # ------------------------------------------------------------------
    def _revalidate(self, path: str):
        data = self._read_json()
        for entry in data:
            if entry["path"] == path:
                entry["expiresAt"] = time.time() + self.expires_minutes * 60
        self._write_json(data)

    def _add_path(self, path: str) -> dict:
        new_path = self._format_path(path)
        if path != new_path:
            os.rename(path, new_path)
        data = self._read_json()
        data = [e for e in data if e["path"] != new_path]
        entry = {
            "path":      new_path,
            "filename":  new_path.split("/")[-1],
            "id":        str(uuid4()),
            "expiresAt": time.time() + self.expires_minutes * 60,
        }
        data.append(entry)
        self._write_json(data)
        return entry

    # ------------------------------------------------------------------
    def save_file(self, data: bytes, filename: str) -> dict:
        filename  = self._format_path(filename)
        file_path = f"fl/{uuid4()}_{filename}"
        with open(file_path, "wb") as f:
            f.write(data)
        return self._add_path(file_path)

    def get_url(self, entry: dict) -> str:
        return f"{self.base_url}/file=./{entry['path']}"

    def get_entry_by_id(self, uid: str) -> dict | None:
        for entry in self._read_json():
            if entry["id"] == uid:
                self._revalidate(entry["path"])
                return entry
        return None