import logging

from yuxi.channel.extensions.wecom.types import InboundWeComMessage

logger = logging.getLogger(__name__)


async def handle_event(msg: InboundWeComMessage) -> str | None:
    event = msg.event
    event_key = msg.event_key

    if event == "click":
        return await _handle_click(msg, event_key)
    if event == "view":
        logger.info("WeCom view event: key=%s user=%s", event_key, msg.from_user)
        return None
    if event == "scancode_push":
        return await _handle_scancode(msg, event_key)
    if event == "scancode_waitmsg":
        return await _handle_scancode(msg, event_key)
    if event in ("subscribe", "enter_agent"):
        return await _handle_enter(msg)
    if event == "unsubscribe":
        logger.info("WeCom unsubscribe: user=%s", msg.from_user)
        return None
    if event == "location_select":
        return await _handle_location_select(msg)
    if event == "change_external_contact":
        return await _handle_external_contact_change(msg)
    if event == "change_external_chat":
        return await _handle_external_chat_change(msg)
    if event in ("pic_sysphoto", "pic_photo_or_album", "pic_weixin"):
        logger.info("WeCom pic event: %s user=%s", event, msg.from_user)
        return None

    logger.debug("WeCom unhandled event: %s user=%s", event, msg.from_user)
    return None


async def _handle_click(msg: InboundWeComMessage, event_key: str) -> str | None:
    logger.info("WeCom click event: key=%s user=%s", event_key, msg.from_user)
    return f"菜单点击: {event_key}"


async def _handle_enter(msg: InboundWeComMessage) -> str | None:
    logger.info("WeCom enter event: user=%s", msg.from_user)
    return "你好！我是 AI 助手，有什么可以帮你的？"


async def _handle_scancode(msg: InboundWeComMessage, event_key: str) -> str | None:
    logger.info("WeCom scancode event: key=%s user=%s", event_key, msg.from_user)
    return f"扫码事件: {event_key}"


async def _handle_location_select(msg: InboundWeComMessage) -> str | None:
    logger.info(
        "WeCom location_select event: user=%s content=%s",
        msg.from_user,
        msg.content,
    )
    return None


async def _handle_external_contact_change(msg: InboundWeComMessage) -> str | None:
    change_type = msg.raw_xml.get("ChangeType", "")
    external_user_id = msg.raw_xml.get("ExternalUserID", "")

    if change_type == "add_external_contact":
        logger.info(
            "New external contact added: user=%s external=%s",
            msg.from_user,
            external_user_id,
        )
        return "你好！欢迎添加我为联系人，有什么可以帮你的？"
    if change_type == "del_external_contact":
        logger.info(
            "External contact removed: user=%s external=%s",
            msg.from_user,
            external_user_id,
        )

    return None


async def _handle_external_chat_change(msg: InboundWeComMessage) -> str | None:
    change_type = msg.raw_xml.get("ChangeType", "")
    chat_id = msg.raw_xml.get("ChatId", "")
    logger.info("External chat change: type=%s chat=%s", change_type, chat_id)
    return None