from __future__ import annotations

import json

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

from .mentions import parse_mentions
from .slash_commands import extract_command


def map_event_type(event_str: str) -> EventType:
    _map = {
        "MESSAGE": EventType.MESSAGE_RECEIVED,
        "MESSAGE_UPDATE": EventType.MESSAGE_UPDATED,
        "MESSAGE_DELETE": EventType.MESSAGE_DELETED,
        "ADDED_TO_SPACE": EventType.BOT_ADDED,
        "REMOVED_FROM_SPACE": EventType.BOT_REMOVED,
        "CARD_CLICKED": EventType.CARD_ACTION,
    }
    return _map.get(event_str, EventType.MESSAGE_RECEIVED)


def normalize_inbound(
    channel_id: str,
    channel_type: ChannelType,
    raw_payload: dict,
    bot_user: str = "",
) -> ChannelMessage:
    event = raw_payload.get("event", {})
    event_type_str = event.get("type", "")
    message = event.get("message", {})
    space = event.get("space", {})
    user = event.get("user", {})
    sender = message.get("sender", {})

    event_type = map_event_type(event_type_str)

    space_name = space.get("name", "")
    space_type = space.get("spaceType", "SPACE")
    chat_type = _resolve_chat_type(space_type, message, raw_payload, event_type)

    thread_key = message.get("thread", {}).get("threadKey", "")
    if thread_key:
        chat_type = ChatType.THREAD
        chat_id = f"{space_name}/threads/{thread_key}"
    else:
        chat_id = space_name

    mentions = parse_mentions(message, bot_user)

    content = _extract_content(message, event_type, raw_payload)
    msg_type = map_msg_type(message, event_type)
    attachments = extract_attachments(message)
    argument_text = _extract_argument_text(message)
    context = _build_context(channel_id, event, message, space, user, sender)
    route_envelope = resolve_route_envelope(chat_type, space_name, user.get("name", ""))

    command, command_args = extract_command(content)

    return ChannelMessage(
        identity=ChannelIdentity(
            channel_id=channel_id,
            channel_type=channel_type,
            channel_user_id=user.get("name", ""),
            channel_chat_id=chat_id,
            channel_message_id=message.get("name", ""),
        ),
        chat_type=chat_type,
        event_type=event_type,
        message_type=MessageType.COMMAND if command else msg_type,
        content=content,
        attachments=attachments,
        mentions=mentions,
        metadata={
            "space_name": space_name,
            "space_type": space_type,
            "thread_key": thread_key,
            "sender_name": sender.get("name", ""),
            "sender_type": sender.get("type", ""),
            "argument_text": argument_text,
            "context": context,
            "route_envelope": route_envelope,
            "slash_command": command,
            "slash_args": command_args,
        },
    )


def is_bot_message(message: dict) -> bool:
    sender = message.get("sender", {})
    return sender.get("type", "") == "BOT"


def _extract_argument_text(message: dict) -> str:
    annotations = message.get("annotations", [])
    for annotation in annotations:
        if annotation.get("type") == "SLASH_COMMAND":
            return message.get("argumentText", "")
    return ""


def _build_context(
    channel_id: str,
    event: dict,
    message: dict,
    space: dict,
    user: dict,
    sender: dict,
) -> dict:
    return {
        "channel": channel_id,
        "accountId": event.get("accountId", ""),
        "messageId": message.get("name", ""),
        "from": sender.get("name", ""),
        "sender": sender,
        "conversation": space,
        "reply": message.get("thread", {}),
    }


def _resolve_chat_type(
    space_type: str,
    message: dict,
    raw_payload: dict,
    event_type: EventType,
) -> ChatType:
    if space_type == "DIRECT_MESSAGE":
        return ChatType.DIRECT
    if raw_payload.get("is_card_clicked"):
        return ChatType.SPACE
    if event_type == EventType.CARD_ACTION:
        return ChatType.SPACE
    return ChatType.SPACE


def is_forwarded_message(message: dict) -> bool:
    return bool(message.get("retentionSettings")) or bool(message.get("lastUpdateTime") and message.get("createTime"))


def detect_message_edit(message: dict) -> bool:
    create_time = message.get("createTime", "")
    update_time = message.get("lastUpdateTime", "")
    if create_time and update_time and create_time != update_time:
        return True
    return False


def resolve_route_envelope(chat_type: ChatType, space_name: str, user_name: str) -> dict:
    if chat_type == ChatType.DIRECT:
        user_id = user_name.removeprefix("users/") if user_name.startswith("users/") else user_name
        return {
            "peer_kind": "direct",
            "peer_id": user_name,
            "peer_key": f"direct:{user_id}",
            "route": {
                "session_key": f"direct:{user_id}",
                "content": {"type": "direct", "id": user_name},
            },
        }
    space_id = space_name.removeprefix("spaces/") if space_name.startswith("spaces/") else space_name
    return {
        "peer_kind": "group",
        "peer_id": space_name,
        "peer_key": f"space:{space_id}",
        "route": {
            "session_key": f"space:{space_id}",
            "content": {"type": "space", "id": space_name},
        },
    }


def map_msg_type(message: dict, event_type: EventType) -> MessageType:
    if event_type == EventType.CARD_ACTION:
        return MessageType.CARD

    attachments = message.get("attachment", message.get("attachments", []))
    if attachments:
        first = attachments[0] if attachments else {}
        content_type = first.get("contentType", "")
        if content_type.startswith("image/"):
            return MessageType.IMAGE
        if content_type.startswith("video/"):
            return MessageType.VIDEO
        if content_type.startswith("audio/"):
            return MessageType.AUDIO
        if content_type:
            return MessageType.FILE

    text = message.get("text", "")
    if message.get("cardsV2") or message.get("cards_v2"):
        return MessageType.CARD
    if text:
        return MessageType.TEXT

    return MessageType.TEXT


def extract_attachments(message: dict) -> list[Attachment]:
    attachments = message.get("attachment", message.get("attachments", []))
    if not attachments:
        return []

    result: list[Attachment] = []
    for att in attachments:
        name = att.get("name", "")
        content_name = att.get("contentName", "")
        content_type = att.get("contentType", "")

        att_type = "file"
        if content_type.startswith("image/"):
            att_type = "image"
        elif content_type.startswith("video/"):
            att_type = "video"
        elif content_type.startswith("audio/"):
            att_type = "audio"

        result.append(
            Attachment(
                type=att_type,
                filename=content_name,
                mime_type=content_type,
                file_id=_encode_file_id(name),
                metadata={"attachment_name": name},
            )
        )
    return result


def _encode_file_id(attachment_name: str) -> str:
    return json.dumps({"name": attachment_name})


def _extract_content(
    message: dict,
    event_type: EventType,
    raw_payload: dict,
) -> str:
    if event_type == EventType.CARD_ACTION:
        action = raw_payload.get("action", {})
        return json.dumps(action)
    return message.get("text", "")