import json
from typing import Optional, Union
from pydantic import BaseModel
from fastapi import APIRouter, Depends, HTTPException, status


from open_webui.apps.webui.models.knowledge import (
    Knowledges,
    KnowledgeUpdateForm,
    KnowledgeForm,
    KnowledgeResponse,
)
from open_webui.apps.webui.models.files import Files, FileModel
from open_webui.apps.retrieval.vector.connector import VECTOR_DB_CLIENT
from open_webui.apps.retrieval.main import process_file, ProcessFileForm


from open_webui.constants import ERROR_MESSAGES
from open_webui.utils.utils import get_admin_user, get_verified_user


router = APIRouter()

############################
# GetKnowledgeItems
############################


@router.get(
    "/", response_model=Optional[Union[list[KnowledgeResponse], KnowledgeResponse]]
)
async def get_knowledge_items(
    id: Optional[str] = None, user=Depends(get_verified_user)
):
    if id:
        knowledge = Knowledges.get_knowledge_by_id(id=id)

        if knowledge:
            return knowledge
        else:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail=ERROR_MESSAGES.NOT_FOUND,
            )
    else:
        return [
            KnowledgeResponse(**knowledge.model_dump())
            for knowledge in Knowledges.get_knowledge_items()
        ]


############################
# CreateNewKnowledge
############################


@router.post("/create", response_model=Optional[KnowledgeResponse])
async def create_new_knowledge(form_data: KnowledgeForm, user=Depends(get_admin_user)):
    knowledge = Knowledges.insert_new_knowledge(user.id, form_data)

    if knowledge:
        return knowledge
    else:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.FILE_EXISTS,
        )


############################
# GetKnowledgeById
############################


class KnowledgeFilesResponse(KnowledgeResponse):
    files: list[FileModel]


@router.get("/{id}", response_model=Optional[KnowledgeFilesResponse])
async def get_knowledge_by_id(id: str, user=Depends(get_verified_user)):
    knowledge = Knowledges.get_knowledge_by_id(id=id)

    if knowledge:
        file_ids = knowledge.data.get("file_ids", []) if knowledge.data else []
        files = Files.get_files_by_ids(file_ids)

        return KnowledgeFilesResponse(
            **knowledge.model_dump(),
            files=files,
        )
    else:
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


############################
# UpdateKnowledgeById
############################


@router.post("/{id}/update", response_model=Optional[KnowledgeFilesResponse])
async def update_knowledge_by_id(
    id: str,
    form_data: KnowledgeUpdateForm,
    user=Depends(get_admin_user),
):
    knowledge = Knowledges.update_knowledge_by_id(id=id, form_data=form_data)

    if knowledge:
        file_ids = knowledge.data.get("file_ids", []) if knowledge.data else []
        files = Files.get_files_by_ids(file_ids)

        return KnowledgeFilesResponse(
            **knowledge.model_dump(),
            files=files,
        )
    else:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ID_TAKEN,
        )


############################
# AddFileToKnowledge
############################


class KnowledgeFileIdForm(BaseModel):
    file_id: str


@router.post("/{id}/file/add", response_model=Optional[KnowledgeFilesResponse])
def add_file_to_knowledge_by_id(
    id: str,
    form_data: KnowledgeFileIdForm,
    user=Depends(get_admin_user),
):
    knowledge = Knowledges.get_knowledge_by_id(id=id)
    file = Files.get_file_by_id(form_data.file_id)
    if not file:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )
    if not file.data:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.FILE_NOT_PROCESSED,
        )

    # Add content to the vector database
    try:
        process_file(ProcessFileForm(file_id=form_data.file_id, collection_name=id))
    except Exception as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e),
        )

    if knowledge:
        data = knowledge.data or {}
        file_ids = data.get("file_ids", [])

        if form_data.file_id not in file_ids:
            file_ids.append(form_data.file_id)
            data["file_ids"] = file_ids

            knowledge = Knowledges.update_knowledge_by_id(
                id=id, form_data=KnowledgeUpdateForm(data=data)
            )

            if knowledge:
                files = Files.get_files_by_ids(file_ids)

                return KnowledgeFilesResponse(
                    **knowledge.model_dump(),
                    files=files,
                )
            else:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail=ERROR_MESSAGES.DEFAULT("knowledge"),
                )
        else:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=ERROR_MESSAGES.DEFAULT("file_id"),
            )
    else:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


@router.post("/{id}/file/update", response_model=Optional[KnowledgeFilesResponse])
def update_file_from_knowledge_by_id(
    id: str,
    form_data: KnowledgeFileIdForm,
    user=Depends(get_admin_user),
):
    knowledge = Knowledges.get_knowledge_by_id(id=id)
    file = Files.get_file_by_id(form_data.file_id)
    if not file:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    # Remove content from the vector database
    VECTOR_DB_CLIENT.delete(
        collection_name=knowledge.id, filter={"file_id": form_data.file_id}
    )

    # Add content to the vector database
    try:
        process_file(ProcessFileForm(file_id=form_data.file_id, collection_name=id))
    except Exception as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e),
        )

    if knowledge:
        data = knowledge.data or {}
        file_ids = data.get("file_ids", [])

        files = Files.get_files_by_ids(file_ids)

        return KnowledgeFilesResponse(
            **knowledge.model_dump(),
            files=files,
        )
    else:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


############################
# RemoveFileFromKnowledge
############################


@router.post("/{id}/file/remove", response_model=Optional[KnowledgeFilesResponse])
def remove_file_from_knowledge_by_id(
    id: str,
    form_data: KnowledgeFileIdForm,
    user=Depends(get_admin_user),
):
    knowledge = Knowledges.get_knowledge_by_id(id=id)
    file = Files.get_file_by_id(form_data.file_id)
    if not file:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    # Remove content from the vector database
    VECTOR_DB_CLIENT.delete(
        collection_name=knowledge.id, filter={"file_id": form_data.file_id}
    )

    result = VECTOR_DB_CLIENT.query(
        collection_name=knowledge.id,
        filter={"file_id": form_data.file_id},
    )

    Files.delete_file_by_id(form_data.file_id)

    if knowledge:
        data = knowledge.data or {}
        file_ids = data.get("file_ids", [])

        if form_data.file_id in file_ids:
            file_ids.remove(form_data.file_id)
            data["file_ids"] = file_ids

            knowledge = Knowledges.update_knowledge_by_id(
                id=id, form_data=KnowledgeUpdateForm(data=data)
            )

            if knowledge:
                files = Files.get_files_by_ids(file_ids)

                return KnowledgeFilesResponse(
                    **knowledge.model_dump(),
                    files=files,
                )
            else:
                raise HTTPException(
                    status_code=status.HTTP_400_BAD_REQUEST,
                    detail=ERROR_MESSAGES.DEFAULT("knowledge"),
                )
        else:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=ERROR_MESSAGES.DEFAULT("file_id"),
            )
    else:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


############################
# DeleteKnowledgeById
############################


@router.delete("/{id}/delete", response_model=bool)
async def delete_knowledge_by_id(id: str, user=Depends(get_admin_user)):
    VECTOR_DB_CLIENT.delete_collection(collection_name=id)
    result = Knowledges.delete_knowledge_by_id(id=id)
    return result