# -*- coding: utf-8 -*-
"""ファイル名衝突回避コピー・移動、ファイルサイズ安定待ちモジュール。"""
from __future__ import annotations

import shutil
import time
from pathlib import Path
from typing import Callable


def resolve_unique_path(dest_dir: Path, stem: str, suffix: str) -> Path:
    candidate = dest_dir / f"{stem}{suffix}"
    if not candidate.exists():
        return candidate

    counter = 2
    while True:
        candidate = dest_dir / f"{stem}({counter}){suffix}"
        if not candidate.exists():
            return candidate
        counter += 1


def copy_with_unique_name(src: Path, dest_dir: Path, stem: str, suffix: str) -> Path:
    dest_dir.mkdir(parents=True, exist_ok=True)
    dest_path = resolve_unique_path(dest_dir, stem, suffix)
    shutil.copy2(str(src), str(dest_path))
    return dest_path


def move_with_unique_name(src: Path, dest_dir: Path, stem: str, suffix: str) -> Path:
    dest_dir.mkdir(parents=True, exist_ok=True)
    dest_path = resolve_unique_path(dest_dir, stem, suffix)
    shutil.move(str(src), str(dest_path))
    return dest_path


def wait_until_stable(
    path: Path,
    interval_sec: float,
    retries: int,
    sleep_func: Callable[[float], None] = time.sleep,
) -> bool:
    if not path.exists():
        return False

    previous_size = path.stat().st_size
    for _ in range(retries):
        sleep_func(interval_sec)
        if not path.exists():
            return False
        current_size = path.stat().st_size
        if current_size == previous_size:
            return True
        previous_size = current_size

    return False