import tempfile
from pathlib import Path
from typing import List

def split_files(file_list: List[str], num_splits: int) -> List[List[str]]:
    """
    将文件列表分割成指定数量的子列表
    
    Args:
        file_list: 文件路径列表
        num_splits: 分割数量
        
    Returns:
        分割后的文件列表
    """
    if num_splits <= 0:
        return [file_list]
    
    chunk_size = len(file_list) // num_splits
    remainder = len(file_list) % num_splits
    
    chunks = []
    start = 0
    
    for i in range(num_splits):
        # 前remainder个chunk多分配一个文件
        current_chunk_size = chunk_size + (1 if i < remainder else 0)
        if current_chunk_size > 0:
            chunks.append(file_list[start:start + current_chunk_size])
            start += current_chunk_size
    
    return [chunk for chunk in chunks if chunk]  # 过滤空列表

def create_temp_file_list(file_chunk: List[str]) -> str:
    """
    创建临时文件列表文件
    
    Args:
        file_chunk: 文件路径列表
        
    Returns:
        临时文件路径
    """
    with tempfile.NamedTemporaryFile(mode='w', suffix='.txt', delete=False) as f:
        for file_path in file_chunk:
            f.write(f"{file_path}\n")
        return f.name

def get_image_files_from_dir(input_dir: Path, max_files: int = None) -> List[str]:
    """
    从目录获取图像文件列表
    
    Args:
        input_dir: 输入目录
        max_files: 最大文件数量限制
        
    Returns:
        图像文件路径列表
    """
    image_extensions = ['.jpg', '.jpeg', '.png', '.bmp', '.tiff', '.tif']
    image_files = []
    
    for ext in image_extensions:
        image_files.extend(list(input_dir.glob(f"*{ext}")))
        image_files.extend(list(input_dir.glob(f"*{ext.upper()}")))
    
    # 去重并排序
    image_files = sorted(list(set(str(f) for f in image_files)))
    
    # 限制文件数量
    if max_files:
        image_files = image_files[:max_files]
    
    return image_files

def get_image_files_from_list(file_list_path: str) -> List[str]:
    """
    从文件列表获取图像文件列表
    
    Args:
        file_list_path: 文件列表路径
        
    Returns:
        图像文件路径列表
    """
    print(f"📄 Reading file list from: {file_list_path}")
    
    with open(file_list_path, 'r', encoding='utf-8') as f:
        image_files = [line.strip() for line in f if line.strip()]
    
    # 验证文件存在性
    valid_files = []
    missing_files = []
    
    for file_path in image_files:
        if Path(file_path).exists():
            valid_files.append(file_path)
        else:
            missing_files.append(file_path)
    
    if missing_files:
        print(f"⚠️ Warning: {len(missing_files)} files not found:")
        for missing_file in missing_files[:5]:  # 只显示前5个
            print(f"  - {missing_file}")
        if len(missing_files) > 5:
            print(f"  ... and {len(missing_files) - 5} more")
    
    print(f"✅ Found {len(valid_files)} valid files out of {len(image_files)} in list")
    return valid_files

def get_image_files_from_csv(csv_file: str, status_filter: str = "fail") -> List[str]:
    """
    从CSV文件获取图像文件列表

    Args:
        csv_file: CSV文件路径
        status_filter: 状态过滤器

    Returns:
        图像文件路径列表
    """
    print(f"📄 Reading image files from CSV: {csv_file}")

	# 读取CSV文件, 表头：image_path,status
    image_files = []
    with open(csv_file, 'r', encoding='utf-8') as f:
        for line in f:
            # 需要去掉表头， 按“,”分割，读取文件名，状态
            image_file, status = line.strip().split(",")
            if status.lower() == status_filter.lower():
                image_files.append(image_file)

    return image_files