from __future__ import annotations

import json
from typing import Any

from yuxi.channels.models import (
    Attachment,
    ChannelIdentity,
    ChannelMessage,
    ChannelType,
    ChatType,
    EventType,
    MentionsInfo,
    MessageType,
)

from .session import generate_dingding_chat_id, resolve_dingding_chat_type


def map_event_type(raw: dict) -> EventType:
    if raw.get("event_type") == "card_action":
        return EventType.CARD_ACTION
    if raw.get("action_from") == "card_callback":
        return EventType.CARD_ACTION
    if raw.get("robotCode"):
        return EventType.BOT_ADDED
    return EventType.MESSAGE_RECEIVED


def map_msg_type(raw: dict) -> MessageType:
    msg_type = raw.get("msgtype", "text")
    _map: dict[str, MessageType] = {
        "text": MessageType.TEXT,
        "image": MessageType.IMAGE,
        "file": MessageType.FILE,
        "voice": MessageType.AUDIO,
        "video": MessageType.VIDEO,
        "markdown": MessageType.TEXT,
        "link": MessageType.TEXT,
        "actionCard": MessageType.CARD,
        "feedCard": MessageType.CARD,
        "oa": MessageType.TEXT,
        "sticker": MessageType.STICKER,
    }
    return _map.get(msg_type, MessageType.TEXT)


def _parse_content(content: Any) -> dict:
    if isinstance(content, dict):
        return content
    if isinstance(content, str):
        try:
            return json.loads(content)
        except (json.JSONDecodeError, TypeError):
            return {}
    return {}


def _describe_media(msg_type: str, parsed: dict, raw: dict | None = None) -> str:
    if msg_type == "image":
        return "[图片]"
    if msg_type == "file":
        filename = parsed.get("fileName", parsed.get("file_name", ""))
        if not filename and raw:
            filename = raw.get("fileName", "")
        return f"[文件: {filename}]" if filename else "[文件]"
    if msg_type == "voice":
        return "[语音]"
    if msg_type == "video":
        return "[视频]"
    if msg_type == "sticker":
        return "[贴纸]"
    return ""


def extract_text(raw: dict) -> str:
    msg_type = raw.get("msgtype", "text")
    text_block = raw.get("text", {})

    if msg_type in ("image", "file", "voice", "video", "sticker"):
        parsed = _parse_content(raw.get("content", text_block))
        return _describe_media(msg_type, parsed, raw)

    if isinstance(text_block, dict):
        return text_block.get("content", "")
    if isinstance(text_block, str):
        return text_block
    try:
        return str(text_block) if text_block else ""
    except Exception:
        return ""


def extract_attachments(raw: dict) -> list[Attachment]:
    msg_type = raw.get("msgtype", "text")
    content = raw.get("content", {})

    if msg_type == "image":
        download_code = raw.get("downloadCode", "") or raw.get("download_code", "")
        if download_code:
            return [Attachment(type="image", file_id=download_code)]
        return []

    if msg_type == "file":
        download_code = raw.get("downloadCode", "") or raw.get("download_code", "")
        if download_code:
            return [
                Attachment(
                    type="file",
                    file_id=download_code,
                    filename=raw.get("fileName", ""),
                )
            ]
        return []

    if msg_type == "voice":
        download_code = raw.get("downloadCode", "") or raw.get("download_code", "")
        if download_code:
            return [Attachment(type="audio", file_id=download_code)]
        return []

    if msg_type == "video":
        download_code = raw.get("downloadCode", "") or raw.get("download_code", "")
        if download_code:
            return [Attachment(type="video", file_id=download_code)]
        return []

    if msg_type == "sticker":
        parsed = _parse_content(content)
        download_code = parsed.get("downloadCode", "") or parsed.get("download_code", "")
        if download_code:
            return [Attachment(type="sticker", file_id=download_code)]
        return []

    return []


def extract_mentions(raw: dict) -> MentionsInfo | None:
    if not raw.get("isGroupChat"):
        return None

    mentioned_ids: list[str] = []
    is_at_all = raw.get("isAtAll", False)

    at_users = raw.get("atUsers", [])
    if isinstance(at_users, list):
        for u in at_users:
            if isinstance(u, dict):
                uid = u.get("dingtalkId", "")
                if uid:
                    mentioned_ids.append(uid)

    if is_at_all:
        mentioned_ids.append("@all")

    raw_text = extract_text(raw).strip()

    return MentionsInfo(
        mentioned_user_ids=mentioned_ids,
        is_bot_mentioned=bool(mentioned_ids),
        raw_text=raw_text,
    )


def normalize_inbound(
    channel_id: str,
    channel_type: ChannelType,
    raw_payload: dict[str, Any],
) -> ChannelMessage:
    chat_type_str = resolve_dingding_chat_type(raw_payload)
    chat_type = ChatType(chat_type_str)

    chat_id = generate_dingding_chat_id(raw_payload, chat_type_str)
    sender_id = (
        raw_payload.get("senderId", "")
        or raw_payload.get("senderStaffId", "")
        or raw_payload.get("senderNick", "")
        or "unknown"
    )
    message_id = raw_payload.get("msgId", "") or raw_payload.get("openMsgId", "")

    event_type = map_event_type(raw_payload)
    msg_type = map_msg_type(raw_payload)
    content = extract_text(raw_payload)
    attachments = extract_attachments(raw_payload)
    mentions = extract_mentions(raw_payload)

    metadata: dict[str, Any] = {
        "msgtype": raw_payload.get("msgtype", "text"),
        "isGroupChat": raw_payload.get("isGroupChat", False),
    }
    if raw_payload.get("rootId"):
        metadata["root_id"] = raw_payload["rootId"]
    if raw_payload.get("conversationId"):
        metadata["conversation_id"] = raw_payload["conversationId"]

    return ChannelMessage(
        identity=ChannelIdentity(
            channel_id=channel_id,
            channel_type=channel_type,
            channel_user_id=sender_id,
            channel_chat_id=chat_id,
            channel_message_id=message_id,
        ),
        event_type=event_type,
        message_type=msg_type,
        chat_type=chat_type,
        content=content,
        attachments=attachments,
        mentions=mentions,
        metadata=metadata,
    )