"""
工具函数模块
"""

import hashlib
import os
import time
import logging
from typing import Optional, List
from pathlib import Path
from datetime import datetime

import numpy as np


def setup_logging(
    level: int = logging.INFO,
    log_file: Optional[str] = None,
    format_str: str = "%(asctime)s - %(name)s - %(levelname)s - %(message)s"
) -> logging.Logger:
    """设置日志配置"""
    logger = logging.getLogger("benchmark")
    if logger.handlers:
        return logger
    
    logger.setLevel(level)
    formatter = logging.Formatter(format_str)
    
    console_handler = logging.StreamHandler()
    console_handler.setLevel(level)
    console_handler.setFormatter(formatter)
    logger.addHandler(console_handler)
    
    if log_file:
        file_handler = logging.FileHandler(log_file, encoding="utf-8")
        file_handler.setLevel(level)
        file_handler.setFormatter(formatter)
        logger.addHandler(file_handler)
    
    return logger


def get_file_hash(file_path: str, algorithm: str = "md5") -> str:
    """计算文件哈希值"""
    hash_func = hashlib.new(algorithm)
    with open(file_path, "rb") as f:
        for chunk in iter(lambda: f.read(8192), b""):
            hash_func.update(chunk)
    return hash_func.hexdigest()


def ensure_dir(path: str) -> str:
    """确保目录存在"""
    Path(path).mkdir(parents=True, exist_ok=True)
    return path


def get_timestamp() -> str:
    """获取当前时间戳字符串"""
    return datetime.now().strftime("%Y%m%d_%H%M%S")


def format_duration(seconds: float) -> str:
    """格式化时间长度"""
    if seconds < 60:
        return f"{seconds:.1f}s"
    elif seconds < 3600:
        minutes = int(seconds // 60)
        secs = seconds % 60
        return f"{minutes}m {secs:.1f}s"
    else:
        hours = int(seconds // 3600)
        minutes = int((seconds % 3600) // 60)
        return f"{hours}h {minutes}m"


def calculate_statistics(data: List[float]) -> dict:
    """计算统计值"""
    if not data:
        return {"avg": 0.0, "min": 0.0, "max": 0.0, "p95": 0.0, "p99": 0.0, "std": 0.0}
    
    arr = np.array(data)
    return {
        "avg": float(np.mean(arr)),
        "min": float(np.min(arr)),
        "max": float(np.max(arr)),
        "p95": float(np.percentile(arr, 95)),
        "p99": float(np.percentile(arr, 99)),
        "std": float(np.std(arr)),
    }


class Timer:
    """计时器上下文管理器"""
    def __init__(self, name: str = ""):
        self.name = name
        self.elapsed = 0.0
    
    def __enter__(self):
        self.start_time = time.perf_counter()
        return self
    
    def __exit__(self, *args):
        self.elapsed = time.perf_counter() - self.start_time
    
    @property
    def elapsed_ms(self) -> float:
        return self.elapsed * 1000


class RateCounter:
    """速率计数器"""
    def __init__(self, window_size: int = 100):
        self.window_size = window_size
        self.timestamps: List[float] = []
        self.counts: List[int] = []
    
    def tick(self, count: int = 1):
        now = time.time()
        self.timestamps.append(now)
        self.counts.append(count)
        while len(self.timestamps) > self.window_size:
            self.timestamps.pop(0)
            self.counts.pop(0)
    
    def get_rate(self) -> float:
        if len(self.timestamps) < 2:
            return 0.0
        duration = self.timestamps[-1] - self.timestamps[0]
        if duration <= 0:
            return 0.0
        return sum(self.counts) / duration
    
    def reset(self):
        self.timestamps.clear()
        self.counts.clear()