import aiohttp
from typing import Optional
from app.core.biz_exception import BizLogicError


class WhatsappService:

    @staticmethod
    async def send_text(
        api_base_url: str,
        session: str,
        chat_id: str,
        message: str,
        api_key: Optional[str] = None,
    ):
        if not api_base_url:
            raise BizLogicError("Whatsapp api_base_url not configured")
        if not chat_id:
            raise BizLogicError("Whatsapp chat_id missing")

        headers = {}
        if api_key:
            headers["X-Api-Key"] = api_key

        read_url = f"{api_base_url}/api/{session}/chats/{chat_id}/messages/read"
        send_url = f"{api_base_url}/api/sendText"

        timeout = aiohttp.ClientTimeout(total=10)
        try:
            async with aiohttp.ClientSession(timeout=timeout) as session_client:
                async with session_client.post(read_url, json={}, headers=headers) as read_resp:
                    if read_resp.status >= 300:
                        raise BizLogicError(f"Whatsapp read failed, http_status={read_resp.status}")

                payload = {
                    "session": session,
                    "chatId": chat_id,
                    "text": message,
                }
                async with session_client.post(send_url, json=payload, headers=headers) as send_resp:
                    if send_resp.status >= 300:
                        raise BizLogicError(f"Whatsapp push failed, http_status={send_resp.status}")
        except aiohttp.ClientError as e:
            raise BizLogicError(f"Whatsapp push request error: {e}")

        return True