from typing import Annotated

from app.database import ChatChannelModel
from app.database.chat import (
    ChannelType,
    ChatChannel,
    ChatMessage,
    ChatMessageModel,
    MessageType,
    SilenceUser,
    UserSilenceResp,
)
from app.database.user import User
from app.dependencies.database import Database, Redis, redis_message_client
from app.dependencies.param import BodyOrForm
from app.dependencies.user import get_current_user
from app.log import log
from app.models.notification import ChannelMessage, ChannelMessageTeam
from app.router.v2 import api_v2_router as router
from app.service.redis_message_system import redis_message_system
from app.utils import api_doc

from .banchobot import bot
from .server import server

from fastapi import Depends, HTTPException, Path, Query, Security
from pydantic import BaseModel, Field
from sqlmodel import col, select


class KeepAliveResp(BaseModel):
    silences: list[UserSilenceResp] = Field(default_factory=list)


logger = log("Chat")


@router.post(
    "/chat/ack",
    name="保持连接",
    response_model=KeepAliveResp,
    description="保持公共频道的连接。同时返回最近的禁言列表。",
    tags=["聊天"],
)
async def keep_alive(
    session: Database,
    current_user: Annotated[User, Security(get_current_user, scopes=["chat.read"])],
    history_since: Annotated[int | None, Query(description="获取自此禁言 ID 之后的禁言记录")] = None,
    since: Annotated[int | None, Query(description="获取自此消息 ID 之后的禁言记录")] = None,
):
    resp = KeepAliveResp()
    if history_since:
        silences = (await session.exec(select(SilenceUser).where(col(SilenceUser.id) > history_since))).all()
        resp.silences.extend([UserSilenceResp.from_db(silence) for silence in silences])
    elif since:
        msg = await session.get(ChatMessage, since)
        if msg:
            silences = (await session.exec(select(SilenceUser).where(col(SilenceUser.banned_at) > msg.timestamp))).all()
            resp.silences.extend([UserSilenceResp.from_db(silence) for silence in silences])

    return resp


class MessageReq(BaseModel):
    message: str
    is_action: bool = False
    uuid: str | None = None


@router.post(
    "/chat/channels/{channel}/messages",
    responses={200: api_doc("发送的消息", ChatMessageModel, ["sender", "is_action"])},
    name="发送消息",
    description="发送消息到指定频道。",
    tags=["聊天"],
)
async def send_message(
    session: Database,
    channel: Annotated[str, Path(..., description="频道 ID/名称")],
    req: Annotated[MessageReq, Depends(BodyOrForm(MessageReq))],
    current_user: Annotated[User, Security(get_current_user, scopes=["chat.write"])],
):
    if await current_user.is_restricted(session):
        raise HTTPException(status_code=403, detail="You are restricted from sending messages")

    # 使用明确的查询来获取 channel，避免延迟加载
    if channel.isdigit():
        db_channel = (await session.exec(select(ChatChannel).where(ChatChannel.channel_id == int(channel)))).first()
    else:
        db_channel = (await session.exec(select(ChatChannel).where(ChatChannel.name == channel))).first()

    if db_channel is None:
        raise HTTPException(status_code=404, detail="Channel not found")

    # 立即提取所有需要的属性，避免后续延迟加载
    channel_id = db_channel.channel_id
    channel_type = db_channel.type
    channel_name = db_channel.name
    user_id = current_user.id

    # 对于多人游戏房间，在发送消息前进行Redis键检查
    if channel_type == ChannelType.MULTIPLAYER:
        try:
            redis = redis_message_client
            key = f"channel:{channel_id}:messages"
            key_type = await redis.type(key)
            if key_type not in ["none", "zset"]:
                logger.warning(f"Fixing Redis key {key} with wrong type: {key_type}")
                await redis.delete(key)
        except Exception as e:
            logger.warning(f"Failed to check/fix Redis key for channel {channel_id}: {e}")

    # 使用 Redis 消息系统发送消息 - 立即返回
    resp = await redis_message_system.send_message(
        channel_id=channel_id,
        user=current_user,
        content=req.message,
        is_action=req.is_action,
        user_uuid=req.uuid,
    )

    # 立即广播消息给所有客户端
    is_bot_command = req.message.startswith("!")
    await server.send_message_to_channel(resp, is_bot_command and channel_type == ChannelType.PUBLIC)

    # 处理机器人命令
    if is_bot_command:
        await bot.try_handle(current_user, db_channel, req.message, session)

    await session.refresh(current_user)
    # 为通知系统创建临时 ChatMessage 对象（仅适用于私聊和团队频道）
    if channel_type in [ChannelType.PM, ChannelType.TEAM]:
        temp_msg = ChatMessage(
            message_id=resp["message_id"],  # 使用 Redis 系统生成的ID
            channel_id=channel_id,
            content=req.message,
            sender_id=user_id,
            type=MessageType.ACTION if req.is_action else MessageType.PLAIN,
            uuid=req.uuid,
        )

        if channel_type == ChannelType.PM:
            user_ids = channel_name.split("_")[1:]
            await server.new_private_notification(
                ChannelMessage.init(temp_msg, current_user, [int(u) for u in user_ids], channel_type)
            )
        elif channel_type == ChannelType.TEAM:
            await server.new_private_notification(ChannelMessageTeam.init(temp_msg, current_user))

    return resp


@router.get(
    "/chat/channels/{channel}/messages",
    responses={200: api_doc("获取的消息", list[ChatMessageModel], ["sender"])},
    name="获取消息",
    description="获取指定频道的消息列表（统一按时间正序返回）。",
    tags=["聊天"],
)
async def get_message(
    session: Database,
    channel: str,
    current_user: Annotated[User, Security(get_current_user, scopes=["chat.read"])],
    limit: Annotated[int, Query(ge=1, le=50, description="获取消息的数量")] = 50,
    since: Annotated[int, Query(ge=0, description="获取自此消息 ID 之后的消息（向前加载新消息）")] = 0,
    until: Annotated[int | None, Query(description="获取自此消息 ID 之前的消息（向后翻历史）")] = None,
):
    # 1) 查频道
    if channel.isdigit():
        db_channel = (await session.exec(select(ChatChannel).where(ChatChannel.channel_id == int(channel)))).first()
    else:
        db_channel = (await session.exec(select(ChatChannel).where(ChatChannel.name == channel))).first()

    if db_channel is None:
        raise HTTPException(status_code=404, detail="Channel not found")

    channel_id = db_channel.channel_id

    try:
        messages = await redis_message_system.get_messages(channel_id, limit, since)
        if len(messages) >= 2 and messages[0]["message_id"] > messages[-1]["message_id"]:
            messages.reverse()
        return messages
    except Exception as e:
        logger.warning(f"Failed to get messages from Redis system: {e}")

    base = select(ChatMessage).where(ChatMessage.channel_id == channel_id)

    if since > 0 and until is None:
        # 向前加载新消息 → 直接 ASC
        query = base.where(col(ChatMessage.message_id) > since).order_by(col(ChatMessage.message_id).asc()).limit(limit)
        rows = (await session.exec(query)).all()
        resp = await ChatMessageModel.transform_many(rows, includes=["sender"])
        # 已经 ASC，无需反转
        return resp

    # until 分支（向后翻历史）
    if until is not None:
        # 用 DESC 取最近的更早消息，再反转为 ASC
        query = (
            base.where(col(ChatMessage.message_id) < until).order_by(col(ChatMessage.message_id).desc()).limit(limit)
        )
        rows = (await session.exec(query)).all()
        rows = list(rows)
        rows.reverse()  # 反转为 ASC
        resp = await ChatMessageModel.transform_many(rows, includes=["sender"])
        return resp

    query = base.order_by(col(ChatMessage.message_id).desc()).limit(limit)
    rows = (await session.exec(query)).all()
    rows = list(rows)
    rows.reverse()  # 反转为 ASC
    resp = await ChatMessageModel.transform_many(rows, includes=["sender"])
    return resp


@router.put(
    "/chat/channels/{channel}/mark-as-read/{message}",
    status_code=204,
    name="标记消息为已读",
    description="标记指定消息为已读。",
    tags=["聊天"],
)
async def mark_as_read(
    session: Database,
    channel: Annotated[str, Path(..., description="频道 ID/名称")],
    message: Annotated[int, Path(..., description="消息 ID")],
    current_user: Annotated[User, Security(get_current_user, scopes=["chat.read"])],
):
    # 使用明确的查询获取 channel，避免延迟加载
    if channel.isdigit():
        db_channel = (await session.exec(select(ChatChannel).where(ChatChannel.channel_id == int(channel)))).first()
    else:
        db_channel = (await session.exec(select(ChatChannel).where(ChatChannel.name == channel))).first()

    if db_channel is None:
        raise HTTPException(status_code=404, detail="Channel not found")

    # 立即提取需要的属性
    channel_id = db_channel.channel_id
    await server.mark_as_read(channel_id, current_user.id, message)


class PMReq(BaseModel):
    target_id: int
    message: str
    is_action: bool = False
    uuid: str | None = None


@router.post(
    "/chat/new",
    name="创建私聊频道",
    description="创建一个新的私聊频道。",
    tags=["聊天"],
    responses={
        200: api_doc(
            "创建私聊频道响应",
            {
                "channel": ChatChannelModel,
                "message": ChatMessageModel,
                "new_channel_id": int,
            },
            ["recent_messages.sender", "sender"],
            name="NewPMResponse",
        )
    },
)
async def create_new_pm(
    session: Database,
    req: Annotated[PMReq, Depends(BodyOrForm(PMReq))],
    current_user: Annotated[User, Security(get_current_user, scopes=["chat.write"])],
    redis: Redis,
):
    if await current_user.is_restricted(session):
        raise HTTPException(status_code=403, detail="You are restricted from sending messages")

    user_id = current_user.id
    target = await session.get(User, req.target_id)
    if target is None or await target.is_restricted(session):
        raise HTTPException(status_code=404, detail="Target user not found")
    is_can_pm, block = await target.is_user_can_pm(current_user, session)
    if not is_can_pm:
        raise HTTPException(status_code=403, detail=block)

    channel = await ChatChannel.get_pm_channel(user_id, req.target_id, session)
    if channel is None:
        channel = ChatChannel(
            name=f"pm_{user_id}_{req.target_id}",
            description="Private message channel",
            type=ChannelType.PM,
        )
        session.add(channel)
        await session.commit()
        await session.refresh(channel)
        await session.refresh(target)
        await session.refresh(current_user)

    await server.batch_join_channel([target, current_user], channel)
    channel_resp = await ChatChannelModel.transform(
        channel, user=current_user, server=server, includes=["recent_messages.sender"]
    )
    msg = ChatMessage(
        channel_id=channel.channel_id,
        content=req.message,
        sender_id=user_id,
        type=MessageType.ACTION if req.is_action else MessageType.PLAIN,
        uuid=req.uuid,
    )
    session.add(msg)
    await session.commit()
    await session.refresh(msg)
    await session.refresh(current_user)
    await session.refresh(channel)
    message_resp = await ChatMessageModel.transform(msg, user=current_user, includes=["sender"])
    await server.send_message_to_channel(message_resp)
    return {
        "channel": channel_resp,
        "message": message_resp,
        "new_channel_id": channel_resp["channel_id"],
    }