from urllib.parse import quote, unquote

def encode_url(text):
    return quote(text, safe='')

def decode_url(text):
    try:
        return unquote(text)
    except Exception:
        return "解码失败"

def page():
    from flask import render_template, request
    result = None
    input_text = ""
    action = request.args.get("action")
    text = request.args.get("text", "").strip()

    if text:
        input_text = text
        if action == "decode":
            result = decode_url(text)
        else:
            result = encode_url(text)

    return render_template("url.html", result=result, input_text=input_text)