# utils/telegram_utils.py

import os
import json
import httpx # Sử dụng httpx để gửi request bất đồng bộ

# Lấy URL của Cloudflare Worker từ biến môi trường (Secrets)
WORKER_URL = os.environ.get("WORKER_URL")

async def send_telegram_message(chat_id, text, reply_markup=None):
    """Gửi tin nhắn văn bản qua Cloudflare Worker."""
    if not WORKER_URL:
        print("ERROR: WORKER_URL is not set!")
        return False
    
    url = f"{WORKER_URL}"
    # Dùng Markdown để định dạng nếu Worker hỗ trợ
    payload = {'action': 'sendMessage', 'chat_id': str(chat_id), 'text': text, 'parse_mode': 'Markdown'} 
    if reply_markup:
        # Đảm bảo reply_markup là JSON string nếu nó là dict
        payload['reply_markup'] = json.dumps(reply_markup) if isinstance(reply_markup, dict) else reply_markup
        
    try:
        async with httpx.AsyncClient() as client:
            response = await client.post(url, json=payload, timeout=60)
            response.raise_for_status() # Báo lỗi nếu request thất bại (status code >= 400)
            # print(f"Sent message to {chat_id} via worker: {response.json()}") # Tùy chọn: log lại
            return True
    except httpx.RequestError as e:
        print(f"ERROR sending message via worker (RequestError): {e}")
    except httpx.HTTPStatusError as e:
        print(f"ERROR sending message via worker (HTTPStatusError {e.response.status_code}): {e.response.text}")
    except Exception as e:
        print(f"ERROR sending message via worker (General): {e}")
    return False

async def send_telegram_video(chat_id, video_path, caption):
    """Gửi file video qua Cloudflare Worker."""
    if not WORKER_URL:
        print("ERROR: WORKER_URL is not set!")
        return False
        
    url = f"{WORKER_URL}"
    
    if not os.path.exists(video_path):
        print(f"ERROR: Video file not found: {video_path}")
        # Gửi thông báo lỗi về Telegram nếu file không tồn tại
        await send_telegram_message(chat_id, f"❌ Lỗi Server: Không tìm thấy file `{os.path.basename(video_path)}` để gửi.")
        return False

    # Kiểm tra kích thước file (Tùy chọn, Telegram Bot API thường giới hạn 50MB)
    file_size_mb = os.path.getsize(video_path) / (1024 * 1024)
    if file_size_mb > 49.0: # Giới hạn an toàn < 50MB
        print(f"WARNING: File {video_path} ({file_size_mb:.1f}MB) might be too large for Telegram Bot API.")
        await send_telegram_message(chat_id, f"⚠️ File `{os.path.basename(video_path)}` ({file_size_mb:.1f}MB) có thể quá lớn để gửi qua bot.")
        # Bạn có thể chọn trả về False ở đây nếu muốn chặn gửi file lớn
        # return False

    # Khi gửi file, payload thường được gửi dưới dạng 'data' (form data), không phải 'json'
    data_payload = { 
        'action': 'sendVideo', 
        'chat_id': str(chat_id), 
        'caption': caption 
    }
    
    try:
        with open(video_path, 'rb') as video_file:
            # files={'tên_trường_file': (tên_file, đối_tượng_file, kiểu_mime)}
            files_payload = { 'video': (os.path.basename(video_path), video_file, 'video/mp4') }
            
            async with httpx.AsyncClient() as client:
                # Dùng data=data_payload và files=files_payload
                response = await client.post(url, data=data_payload, files=files_payload, timeout=600) # Tăng timeout
                response.raise_for_status()
                # print(f"Sent video to {chat_id} via worker: {response.json()}") # Tùy chọn: log lại
                return True
    except httpx.RequestError as e:
        print(f"ERROR sending video via worker (RequestError): {e}")
        await send_telegram_message(chat_id, f"❌ Lỗi mạng khi gửi file `{os.path.basename(video_path)}`.")
    except httpx.HTTPStatusError as e:
        print(f"ERROR sending video via worker (HTTPStatusError {e.response.status_code}): {e.response.text}")
        await send_telegram_message(chat_id, f"❌ Lỗi từ server khi gửi file `{os.path.basename(video_path)}`: {e.response.status_code}")
    except Exception as e:
        print(f"ERROR sending video via worker (General): {e}")
        await send_telegram_message(chat_id, f"❌ Lỗi không xác định khi gửi file `{os.path.basename(video_path)}`.")
    return False

async def answer_telegram_callback_query(callback_query_id, text="OK"):
    """Trả lời một callback query qua Worker."""
    if not WORKER_URL: print("ERROR: WORKER_URL not set!"); return
    url = f"{WORKER_URL}"
    payload = {'action': 'answerCallbackQuery', 'callback_query_id': callback_query_id, 'text': text}
    try:
        async with httpx.AsyncClient() as client:
            response = await client.post(url, json=payload, timeout=30)
            response.raise_for_status()
    except Exception as e:
        print(f"ERROR answering callback query {callback_query_id} via worker: {e}")

async def edit_telegram_message_text(chat_id, message_id, text, reply_markup=None):
    """Sửa nội dung tin nhắn văn bản qua Worker."""
    if not WORKER_URL: print("ERROR: WORKER_URL not set!"); return
    url = f"{WORKER_URL}"
    payload = {'action': 'editMessageText', 'chat_id': str(chat_id), 'message_id': message_id, 'text': text, 'parse_mode': 'Markdown'}
    if reply_markup:
         payload['reply_markup'] = json.dumps(reply_markup) if isinstance(reply_markup, dict) else reply_markup
    try:
        async with httpx.AsyncClient() as client:
            response = await client.post(url, json=payload, timeout=60)
            response.raise_for_status()
    except Exception as e:
        print(f"ERROR editing message {message_id} in chat {chat_id} via worker: {e}")

# (Tùy chọn) Thêm các hàm khác nếu cần, ví dụ: delete_telegram_message, edit_telegram_reply_markup
# async def delete_telegram_message(chat_id, message_id): ...