import os
import datetime

# List to accumulate measurement data
measurement_data = []

def append_measurement(target_b_abs, b_x, b_y, measurement_data=measurement_data):
    """Append a single measurement to the global list."""
    measurement = {
        "Target B_abs": target_b_abs,
        "Datetime": datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
        "B_x": b_x,
        "B_y": b_y
    }
    measurement_data.append(measurement)

def save_measurements_to_file(relative_directory, measurement_data=measurement_data):
    """Save accumulated measurements to a file in the specified directory."""
    script_dir = os.path.dirname(os.path.abspath(__file__))
    directory = os.path.join(script_dir, relative_directory)
    os.makedirs(directory, exist_ok=True)

    filename = datetime.datetime.now().strftime("%Y-%m-%d_%H-%M") + ".txt"
    file_path = os.path.join(directory, filename)

    # Write header and data
    with open(file_path, 'w') as f:
        f.write("Target B_abs, Datetime, B_x, B_y\n")
        for entry in measurement_data:
            line = f"{entry['Target B_abs']}, {entry['Datetime']}, {entry['B_x']}, {entry['B_y']}\n"
            f.write(line)

# Example usage
for i in range(5):
    append_measurement(target_b_abs=0.5 + i, b_x=1.0 * i, b_y=2.0 * i)

save_measurements_to_file("Test_Map_" + f"{datetime.datetime.now().strftime('%Y_%m_%d_%H.%M')}")

# print(datetime.datetime.now())