from pydantic import BaseModel, ConfigDict
from typing import List, Union, Optional

import json
import uuid
import time

from sqlalchemy import Column, String, BigInteger, Boolean, Text

from apps.webui.internal.db import Base, get_db


####################
# Chat DB Schema
####################


class Chat(Base):
    __tablename__ = "chat"

    id = Column(String, primary_key=True)
    user_id = Column(String)
    title = Column(Text)
    chat = Column(Text)  # Save Chat JSON as Text

    created_at = Column(BigInteger)
    updated_at = Column(BigInteger)

    share_id = Column(Text, unique=True, nullable=True)
    archived = Column(Boolean, default=False)


class ChatModel(BaseModel):
    model_config = ConfigDict(from_attributes=True)

    id: str
    user_id: str
    title: str
    chat: str

    created_at: int  # timestamp in epoch
    updated_at: int  # timestamp in epoch

    share_id: Optional[str] = None
    archived: bool = False


####################
# Forms
####################


class ChatForm(BaseModel):
    chat: dict


class ChatTitleForm(BaseModel):
    title: str


class ChatResponse(BaseModel):
    id: str
    user_id: str
    title: str
    chat: dict
    updated_at: int  # timestamp in epoch
    created_at: int  # timestamp in epoch
    share_id: Optional[str] = None  # id of the chat to be shared
    archived: bool


class ChatTitleIdResponse(BaseModel):
    id: str
    title: str
    updated_at: int
    created_at: int


class ChatTable:

    def insert_new_chat(self, user_id: str, form_data: ChatForm) -> Optional[ChatModel]:
        with get_db() as db:

            id = str(uuid.uuid4())
            chat = ChatModel(
                **{
                    "id": id,
                    "user_id": user_id,
                    "title": (
                        form_data.chat["title"]
                        if "title" in form_data.chat
                        else "New Chat"
                    ),
                    "chat": json.dumps(form_data.chat),
                    "created_at": int(time.time()),
                    "updated_at": int(time.time()),
                }
            )

            result = Chat(**chat.model_dump())
            db.add(result)
            db.commit()
            db.refresh(result)
            return ChatModel.model_validate(result) if result else None

    def update_chat_by_id(self, id: str, chat: dict) -> Optional[ChatModel]:
        try:
            with get_db() as db:

                chat_obj = db.get(Chat, id)
                chat_obj.chat = json.dumps(chat)
                chat_obj.title = chat["title"] if "title" in chat else "New Chat"
                chat_obj.updated_at = int(time.time())
                db.commit()
                db.refresh(chat_obj)

                return ChatModel.model_validate(chat_obj)
        except Exception as e:
            return None

    def insert_shared_chat_by_chat_id(self, chat_id: str) -> Optional[ChatModel]:
        with get_db() as db:

            # Get the existing chat to share
            chat = db.get(Chat, chat_id)
            # Check if the chat is already shared
            if chat.share_id:
                return self.get_chat_by_id_and_user_id(chat.share_id, "shared")
            # Create a new chat with the same data, but with a new ID
            shared_chat = ChatModel(
                **{
                    "id": str(uuid.uuid4()),
                    "user_id": f"shared-{chat_id}",
                    "title": chat.title,
                    "chat": chat.chat,
                    "created_at": chat.created_at,
                    "updated_at": int(time.time()),
                }
            )
            shared_result = Chat(**shared_chat.model_dump())
            db.add(shared_result)
            db.commit()
            db.refresh(shared_result)

            # Update the original chat with the share_id
            result = (
                db.query(Chat)
                .filter_by(id=chat_id)
                .update({"share_id": shared_chat.id})
            )
            db.commit()
            return shared_chat if (shared_result and result) else None

    def update_shared_chat_by_chat_id(self, chat_id: str) -> Optional[ChatModel]:
        try:
            with get_db() as db:

                print("update_shared_chat_by_id")
                chat = db.get(Chat, chat_id)
                print(chat)
                chat.title = chat.title
                chat.chat = chat.chat
                db.commit()
                db.refresh(chat)

                return self.get_chat_by_id(chat.share_id)
        except:
            return None

    def delete_shared_chat_by_chat_id(self, chat_id: str) -> bool:
        try:
            with get_db() as db:

                db.query(Chat).filter_by(user_id=f"shared-{chat_id}").delete()
                db.commit()

                return True
        except:
            return False

    def update_chat_share_id_by_id(
        self, id: str, share_id: Optional[str]
    ) -> Optional[ChatModel]:
        try:
            with get_db() as db:

                chat = db.get(Chat, id)
                chat.share_id = share_id
                db.commit()
                db.refresh(chat)
                return ChatModel.model_validate(chat)
        except:
            return None

    def toggle_chat_archive_by_id(self, id: str) -> Optional[ChatModel]:
        try:
            with get_db() as db:

                chat = db.get(Chat, id)
                chat.archived = not chat.archived
                db.commit()
                db.refresh(chat)
                return ChatModel.model_validate(chat)
        except:
            return None

    def archive_all_chats_by_user_id(self, user_id: str) -> bool:
        try:
            with get_db() as db:
                db.query(Chat).filter_by(user_id=user_id).update({"archived": True})
                db.commit()
                return True
        except:
            return False

    def get_archived_chat_list_by_user_id(
        self, user_id: str, skip: int = 0, limit: int = 50
    ) -> List[ChatModel]:
        with get_db() as db:

            all_chats = (
                db.query(Chat)
                .filter_by(user_id=user_id, archived=True)
                .order_by(Chat.updated_at.desc())
                # .limit(limit).offset(skip)
                .all()
            )
            return [ChatModel.model_validate(chat) for chat in all_chats]

    def get_chat_list_by_user_id(
        self,
        user_id: str,
        include_archived: bool = False,
        skip: int = 0,
        limit: int = 50,
    ) -> List[ChatModel]:
        with get_db() as db:
            query = db.query(Chat).filter_by(user_id=user_id)
            if not include_archived:
                query = query.filter_by(archived=False)
            all_chats = (
                query.order_by(Chat.updated_at.desc())
                # .limit(limit).offset(skip)
                .all()
            )
            return [ChatModel.model_validate(chat) for chat in all_chats]

    def get_chat_title_id_list_by_user_id(
        self,
        user_id: str,
        include_archived: bool = False,
        skip: int = 0,
        limit: int = 50,
    ) -> List[ChatTitleIdResponse]:
        with get_db() as db:
            query = db.query(Chat).filter_by(user_id=user_id)
            if not include_archived:
                query = query.filter_by(archived=False)

            all_chats = (
                query.order_by(Chat.updated_at.desc())
                # limit cols
                .with_entities(
                    Chat.id, Chat.title, Chat.updated_at, Chat.created_at
                ).all()
            )
            # result has to be destrctured from sqlalchemy `row` and mapped to a dict since the `ChatModel`is not the returned dataclass.
            return [
                ChatTitleIdResponse.model_validate(
                    {
                        "id": chat[0],
                        "title": chat[1],
                        "updated_at": chat[2],
                        "created_at": chat[3],
                    }
                )
                for chat in all_chats
            ]

    def get_chat_list_by_chat_ids(
        self, chat_ids: List[str], skip: int = 0, limit: int = 50
    ) -> List[ChatModel]:
        with get_db() as db:
            all_chats = (
                db.query(Chat)
                .filter(Chat.id.in_(chat_ids))
                .filter_by(archived=False)
                .order_by(Chat.updated_at.desc())
                .all()
            )
            return [ChatModel.model_validate(chat) for chat in all_chats]

    def get_chat_by_id(self, id: str) -> Optional[ChatModel]:
        try:
            with get_db() as db:

                chat = db.get(Chat, id)
                return ChatModel.model_validate(chat)
        except:
            return None

    def get_chat_by_share_id(self, id: str) -> Optional[ChatModel]:
        try:
            with get_db() as db:

                chat = db.query(Chat).filter_by(share_id=id).first()

                if chat:
                    return self.get_chat_by_id(id)
                else:
                    return None
        except Exception as e:
            return None

    def get_chat_by_id_and_user_id(self, id: str, user_id: str) -> Optional[ChatModel]:
        try:
            with get_db() as db:

                chat = db.query(Chat).filter_by(id=id, user_id=user_id).first()
                return ChatModel.model_validate(chat)
        except:
            return None

    def get_chats(self, skip: int = 0, limit: int = 50) -> List[ChatModel]:
        with get_db() as db:

            all_chats = (
                db.query(Chat)
                # .limit(limit).offset(skip)
                .order_by(Chat.updated_at.desc())
            )
            return [ChatModel.model_validate(chat) for chat in all_chats]

    def get_chats_by_user_id(self, user_id: str) -> List[ChatModel]:
        with get_db() as db:

            all_chats = (
                db.query(Chat)
                .filter_by(user_id=user_id)
                .order_by(Chat.updated_at.desc())
            )
            return [ChatModel.model_validate(chat) for chat in all_chats]

    def get_archived_chats_by_user_id(self, user_id: str) -> List[ChatModel]:
        with get_db() as db:

            all_chats = (
                db.query(Chat)
                .filter_by(user_id=user_id, archived=True)
                .order_by(Chat.updated_at.desc())
            )
            return [ChatModel.model_validate(chat) for chat in all_chats]

    def delete_chat_by_id(self, id: str) -> bool:
        try:
            with get_db() as db:

                db.query(Chat).filter_by(id=id).delete()
                db.commit()

                return True and self.delete_shared_chat_by_chat_id(id)
        except:
            return False

    def delete_chat_by_id_and_user_id(self, id: str, user_id: str) -> bool:
        try:
            with get_db() as db:

                db.query(Chat).filter_by(id=id, user_id=user_id).delete()
                db.commit()

                return True and self.delete_shared_chat_by_chat_id(id)
        except:
            return False

    def delete_chats_by_user_id(self, user_id: str) -> bool:
        try:

            with get_db() as db:

                self.delete_shared_chats_by_user_id(user_id)

                db.query(Chat).filter_by(user_id=user_id).delete()
                db.commit()

                return True
        except:
            return False

    def delete_shared_chats_by_user_id(self, user_id: str) -> bool:
        try:

            with get_db() as db:

                chats_by_user = db.query(Chat).filter_by(user_id=user_id).all()
                shared_chat_ids = [f"shared-{chat.id}" for chat in chats_by_user]

                db.query(Chat).filter(Chat.user_id.in_(shared_chat_ids)).delete()
                db.commit()

                return True
        except:
            return False


Chats = ChatTable()
