import csv
import chardet

def detect_encoding(file_path):
    with open(file_path, 'rb') as f:
        raw_data = f.read()
        result = chardet.detect(raw_data)
        return result['encoding']

def read_csv(file_path):
    encodings_to_try = ['utf-8-sig', 'gb18030', 'shift_jis', 'euc-jp']
    detected_encoding = detect_encoding(file_path)
    print(f"Detected encoding: {detected_encoding}")
    
    # Add detected encoding to the front of the list
    if detected_encoding:
        encodings_to_try.insert(0, detected_encoding)
    
    for encoding in encodings_to_try:
        try:
            print(f"Trying encoding: {encoding}")
            with open(file_path, 'r', encoding=encoding) as f:
                reader = csv.reader(f)
                rows = list(reader)
                # Print first 5 rows
                for i, row in enumerate(rows[:5]):
                    print(f"Row {i}: {row}")
                return rows
        except UnicodeDecodeError:
            print(f"Failed with encoding: {encoding}")
            continue
        except Exception as e:
            print(f"Error with encoding {encoding}: {e}")
            continue
    
    raise Exception("Failed to read file with all attempted encodings")

if __name__ == "__main__":
    input_file = "测试.csv"
    print(f"Testing file: {input_file}")
    try:
        data = read_csv(input_file)
        print("\nFile read successfully!")
    except Exception as e:
        print(f"\nError reading file: {e}")