from dataclasses import dataclass, fields


@dataclass
class Camera_Para:
    fx: float
    fy: float
    cx: int
    cy: int


def read_camera_params(file_path) -> Camera_Para:
    # 初始化默认参数
    params = Camera_Para(fx=0.0, fy=0.0, cx=0, cy=0)

    # 获取 dataclass 的字段信息（用于类型转换）
    field_types = {f.name: f.type for f in fields(params)}

    with open(file_path, 'r') as file:
        for line in file:
            line = line.strip()
            if line and '=' in line:
                key, value = line.split('=', 1)
                key = key.strip()
                value = value.strip()

                # 检查字段是否存在
                if key in field_types:
                    try:
                        # 根据字段类型转换值
                        if field_types[key] == float:
                            setattr(params, key, float(value))
                        elif field_types[key] == int:
                            setattr(params, key, int(value))
                    except ValueError:
                        print(f"Warning: Could not convert '{value}' to {field_types[key]} for '{key}'")

    return params