def generate_vcard_string(namecard_data: Dict[str, str]) -> str:
    """
    Generate vCard 3.0 format string from namecard data.

    Args:
        namecard_data: Dictionary containing namecard fields

    Returns:
        vCard formatted string
    """
    name = namecard_data.get('name', '')
    title = namecard_data.get('title', '')
    company = namecard_data.get('company', '')
    phone = namecard_data.get('phone', '')
    email = namecard_data.get('email', '')
    address = namecard_data.get('address', '')
    memo = namecard_data.get('memo', '')

    # Build vCard 3.0 format
    vcard_lines = [
        'BEGIN:VCARD',
        'VERSION:3.0',
        f'FN:{name}',
        f'N:{name};;;',  # Family Name; Given Name; Additional Names; Honorific Prefixes; Honorific Suffixes
    ]

    if company:
        vcard_lines.append(f'ORG:{company}')

    if title:
        vcard_lines.append(f'TITLE:{title}')

    if phone:
        # Clean phone number format for vCard
        clean_phone = phone.replace('-', '').replace(' ', '')
        vcard_lines.append(f'TEL;TYPE=WORK,VOICE:{clean_phone}')

    if email:
        vcard_lines.append(f'EMAIL;TYPE=WORK:{email}')

    if address:
        # vCard address format: PO Box;Extended Address;Street;City;Region;Postal Code;Country
        vcard_lines.append(f'ADR;TYPE=WORK:;;{address};;;;')

    if memo:
        # Escape special characters in memo
        escaped_memo = memo.replace('\n', '\\n').replace(',', '\\,').replace(';', '\\;')
        vcard_lines.append(f'NOTE:{escaped_memo}')

    vcard_lines.append('END:VCARD')

    return '\n'.join(vcard_lines)

def generate_vcard_qrcode(namecard_data: Dict[str, str],
                          box_size: int = 10,
                          border: int = 2) -> BytesIO:
    """
    Generate QR Code image containing vCard data.

    Args:
        namecard_data: Dictionary containing namecard fields
        box_size: Size of each box in pixels (default: 10)
        border: Border size in boxes (default: 2)

    Returns:
        BytesIO object containing PNG image data
    """
    # Generate vCard string
    vcard_string = generate_vcard_string(namecard_data)

    # Create QR Code instance
    qr = qrcode.QRCode(
        version=None,  # Auto-determine version based on data size
        error_correction=qrcode.constants.ERROR_CORRECT_L,
        box_size=box_size,
        border=border,
    )

    # Add vCard data
    qr.add_data(vcard_string)
    qr.make(fit=True)

    # Generate image
    img = qr.make_image(fill_color="black", back_color="white")

    # Save to BytesIO
    img_bytes = BytesIO()
    img.save(img_bytes, format='PNG')
    img_bytes.seek(0)  # Reset pointer to beginning

    return img_bytes

from firebase_admin import storage
from io import BytesIO

def upload_qrcode_to_storage(
        image_bytes: BytesIO, user_id: str, card_id: str) -> str:
    """
    上傳 QR Code 圖片到 Firebase Storage 並回傳公開 URL

    Args:
        image_bytes: QR Code 圖片的 BytesIO 物件
        user_id: 使用者 ID
        card_id: 名片 ID

    Returns:
        圖片的公開 URL，若失敗則回傳 None
    """
    try:
        bucket = storage.bucket()
        blob_name = f"qrcodes/{user_id}/{card_id}.png"
        blob = bucket.blob(blob_name)

        # 上傳圖片
        image_bytes.seek(0)  # 重置指標到開頭
        blob.upload_from_file(image_bytes, content_type='image/png')

        # 設定為公開可讀取
        blob.make_public()

        # 回傳公開 URL
        return blob.public_url
    except Exception as e:
        print(f"Error uploading QR code to storage: {e}")
        return None

import firebase_admin
from firebase_admin import credentials

# Firebase 初始化
firebase_config = {
    "databaseURL": config.FIREBASE_URL,
}
# 如果設定了 Storage Bucket，則加入配置
if config.FIREBASE_STORAGE_BUCKET:
    firebase_config["storageBucket"] = config.FIREBASE_STORAGE_BUCKET

try:
    cred = credentials.ApplicationDefault()
    firebase_admin.initialize_app(cred, firebase_config)
    print("Firebase Admin SDK initialized successfully.")
except Exception as e:
    # 從環境變數解析 JSON
    gac_str = os.environ.get("GOOGLE_APPLICATION_CREDENTIALS_JSON")
    if gac_str:
        cred_json = json.loads(gac_str)
        cred = credentials.Certificate(cred_json)
        firebase_admin.initialize_app(cred, firebase_config)
        print("Firebase Admin SDK initialized successfully from ENV VAR.")

from linebot.models import ImageSendMessage, TextSendMessage

async def handle_download_contact(
        event: PostbackEvent, user_id: str, card_id: str, card_name: str):
    """處理下載聯絡人 QR Code 的請求"""
    try:
        # 1. 從 Firebase 取得完整的名片資料
        card_data = firebase_utils.get_card_by_id(user_id, card_id)
        if not card_data:
            await line_bot_api.reply_message(
                event.reply_token,
                TextSendMessage(text='找不到該名片資料。'))
            return

        # 2. 生成 vCard QR Code
        qrcode_image = qrcode_utils.generate_vcard_qrcode(card_data)

        # 3. 上傳到 Firebase Storage 並取得 URL
        image_url = firebase_utils.upload_qrcode_to_storage(
            qrcode_image, user_id, card_id)

        if not image_url:
            await line_bot_api.reply_message(
                event.reply_token,
                TextSendMessage(text='生成 QR Code 時發生錯誤，請稍後再試。'))
            return

        # 4. 生成使用說明
        instruction_text = qrcode_utils.get_qrcode_usage_instruction(card_name)

        # 5. 回傳 QR Code 圖片和使用說明
        image_message = ImageSendMessage(
            original_content_url=image_url,
            preview_image_url=image_url
        )
        text_message = TextSendMessage(text=instruction_text)

        await line_bot_api.reply_message(
            event.reply_token,
            [image_message, text_message])

    except Exception as e:
        print(f"Error in handle_download_contact: {e}")
        await line_bot_api.reply_message(
            event.reply_token,
            TextSendMessage(text='處理您的請求時發生錯誤，請稍後再試。'))

"footer": {
    "type": "box",
    "layout": "vertical",
    "spacing": "sm",
    "contents": [
        {
            "type": "box",
            "layout": "horizontal",
            "spacing": "sm",
            "contents": [
                {
                    "type": "button",
                    "style": "link",
                    "height": "sm",
                    "action": {
                        "type": "postback",
                        "label": "新增/修改記事",
                        "data": f"action=add_memo&card_id={card_id}",
                        "displayText": f"我想為 {name} 新增記事"
                    },
                    "flex": 1
                },
                {
                    "type": "button",
                    "style": "link",
                    "height": "sm",
                    "action": {
                        "type": "postback",
                        "label": "編輯資料",
                        "data": f"action=edit_card&card_id={card_id}",
                        "displayText": f"我想編輯 {name} 的名片"
                    },
                    "flex": 1
                }
            ]
        },
        {
            "type": "button",
            "style": "primary",
            "height": "sm",
            "action": {
                "type": "postback",
                "label": "📥 加入通訊錄",
                "data": f"action=download_contact&card_id={card_id}",
                "displayText": f"下載 {name} 的聯絡人資訊"
            },
            "margin": "sm"
        }
    ]
}

def get_qrcode_usage_instruction(name: str) -> str:
    """
    Get user instruction message for using the QR Code.

    Args:
        name: Name of the person on the namecard

    Returns:
        Instruction message string
    """
    return f"""已為「{name}」生成聯絡人 QR Code！

📱 使用方式：
1. 用手機相機 App 掃描上方的 QR Code
2. 系統會自動識別聯絡人資訊
3. 點擊「加入聯絡人」即可匯入

✅ 支援 iPhone 和 Android 所有智慧型手機"""

def generate_json_from_image(img: PIL.Image, prompt: str):
    """
    Use Gemini Pro Vision to extract structured data from image.
    """
    model = genai.GenerativeModel('gemini-1.5-pro')
    response = model.generate_content([prompt, img])
    return response

IMGAGE_PROMPT = """
這是一張名片，你是一個名片秘書。請將以下資訊整理成 json 給我。
如果看不出來的，幫我填寫 N/A
只好 json 就好:
name, title, address, email, phone, company.
其中 phone 的內容格式為 #886-0123-456-789,1234. 沒有分機就忽略 ,1234
"""

ValueError: Invalid None value for Firebase Storage bucket.

qr = qrcode.QRCode(
    version=None,         # 自動調整大小
    error_correction=qrcode.constants.ERROR_CORRECT_L,  # 低錯誤修正
    box_size=10,          # 每個方塊 10px
    border=2,             # 邊框 2 個方塊
)

if memo:
    # Escape special characters in memo
    escaped_memo = memo.replace('\n', '\\n').replace(',', '\\,').replace(';', '\\;')
    vcard_lines.append(f'NOTE:{escaped_memo}')

img_bytes = BytesIO()
img.save(img_bytes, format='PNG')
# ❌ 此時指標在檔案末端

blob.upload_from_file(img_bytes, content_type='image/png')
# ❌ 從末端開始讀取 = 讀到空內容

img_bytes = BytesIO()
img.save(img_bytes, format='PNG')
img_bytes.seek(0)  # ✅ 重置指標到開頭

blob.upload_from_file(img_bytes, content_type='image/png')

image_message = ImageSendMessage(
    original_content_url=image_url,  # Firebase Storage 的 public URL
    preview_image_url=image_url      # 可以用同一個 URL
)

# ✅ 好的 Prompt
"""
這是一張名片，你是一個名片秘書。請將以下資訊整理成 json 給我。
如果看不出來的，幫我填寫 N/A
只好 json 就好:
name, title, address, email, phone, company.
"""

# ❌ 不好的 Prompt
"Extract name, title, company from this business card"

# 目前：每次都重新生成並上傳
# 改進：檢查名片資料是否變更
if card_data_hash == cached_hash:
    return cached_qrcode_url  # 直接回傳快取的 URL