from typing import List, Optional
from pydantic import BaseModel
from fastapi import APIRouter, Depends, HTTPException, status, Request, Query
from fastapi.responses import StreamingResponse
from fastapi.concurrency import run_in_threadpool
import logging
import io
import zipfile

from sqlalchemy.orm import Session
from open_webui.internal.db import get_session
from open_webui.models.groups import Groups
from open_webui.models.knowledge import (
    KnowledgeFileListResponse,
    Knowledges,
    KnowledgeForm,
    KnowledgeResponse,
    KnowledgeUserResponse,
)
from open_webui.models.files import Files, FileModel, FileMetadataResponse
from open_webui.retrieval.vector.factory import VECTOR_DB_CLIENT
from open_webui.routers.retrieval import (
    process_file,
    ProcessFileForm,
    process_files_batch,
    BatchProcessFilesForm,
)
from open_webui.storage.provider import Storage

from open_webui.constants import ERROR_MESSAGES
from open_webui.utils.auth import get_verified_user, get_admin_user
from open_webui.utils.access_control import has_access, has_permission


from open_webui.config import BYPASS_ADMIN_ACCESS_CONTROL
from open_webui.models.models import Models, ModelForm


log = logging.getLogger(__name__)

router = APIRouter()

############################
# getKnowledgeBases
############################

PAGE_ITEM_COUNT = 30

############################
# Knowledge Base Embedding
############################

KNOWLEDGE_BASES_COLLECTION = "knowledge-bases"


async def embed_knowledge_base_metadata(
    request: Request,
    knowledge_base_id: str,
    name: str,
    description: str,
) -> bool:
    """Generate and store embedding for knowledge base."""
    try:
        content = f"{name}\n\n{description}" if description else name
        embedding = await request.app.state.EMBEDDING_FUNCTION(content)
        VECTOR_DB_CLIENT.upsert(
            collection_name=KNOWLEDGE_BASES_COLLECTION,
            items=[
                {
                    "id": knowledge_base_id,
                    "text": content,
                    "vector": embedding,
                    "metadata": {
                        "knowledge_base_id": knowledge_base_id,
                    },
                }
            ],
        )
        return True
    except Exception as e:
        log.error(f"Failed to embed knowledge base {knowledge_base_id}: {e}")
        return False


def remove_knowledge_base_metadata_embedding(knowledge_base_id: str) -> bool:
    """Remove knowledge base embedding."""
    try:
        VECTOR_DB_CLIENT.delete(
            collection_name=KNOWLEDGE_BASES_COLLECTION,
            ids=[knowledge_base_id],
        )
        return True
    except Exception as e:
        log.debug(f"Failed to remove embedding for {knowledge_base_id}: {e}")
        return False


class KnowledgeAccessResponse(KnowledgeUserResponse):
    write_access: Optional[bool] = False


class KnowledgeAccessListResponse(BaseModel):
    items: list[KnowledgeAccessResponse]
    total: int


@router.get("/", response_model=KnowledgeAccessListResponse)
async def get_knowledge_bases(
    page: Optional[int] = 1,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    page = max(page, 1)
    limit = PAGE_ITEM_COUNT
    skip = (page - 1) * limit

    filter = {}
    if not user.role == "admin" or not BYPASS_ADMIN_ACCESS_CONTROL:
        groups = Groups.get_groups_by_member_id(user.id, db=db)
        if groups:
            filter["group_ids"] = [group.id for group in groups]

        filter["user_id"] = user.id

    result = Knowledges.search_knowledge_bases(
        user.id, filter=filter, skip=skip, limit=limit, db=db
    )

    return KnowledgeAccessListResponse(
        items=[
            KnowledgeAccessResponse(
                **knowledge_base.model_dump(),
                write_access=(
                    user.id == knowledge_base.user_id
                    or (user.role == "admin" and BYPASS_ADMIN_ACCESS_CONTROL)
                    or has_access(
                        user.id, "write", knowledge_base.access_control, db=db
                    )
                ),
            )
            for knowledge_base in result.items
        ],
        total=result.total,
    )


@router.get("/search", response_model=KnowledgeAccessListResponse)
async def search_knowledge_bases(
    query: Optional[str] = None,
    view_option: Optional[str] = None,
    page: Optional[int] = 1,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    page = max(page, 1)
    limit = PAGE_ITEM_COUNT
    skip = (page - 1) * limit

    filter = {}
    if query:
        filter["query"] = query
    if view_option:
        filter["view_option"] = view_option

    if not user.role == "admin" or not BYPASS_ADMIN_ACCESS_CONTROL:
        groups = Groups.get_groups_by_member_id(user.id, db=db)
        if groups:
            filter["group_ids"] = [group.id for group in groups]

        filter["user_id"] = user.id

    result = Knowledges.search_knowledge_bases(
        user.id, filter=filter, skip=skip, limit=limit, db=db
    )

    return KnowledgeAccessListResponse(
        items=[
            KnowledgeAccessResponse(
                **knowledge_base.model_dump(),
                write_access=(
                    user.id == knowledge_base.user_id
                    or (user.role == "admin" and BYPASS_ADMIN_ACCESS_CONTROL)
                    or has_access(
                        user.id, "write", knowledge_base.access_control, db=db
                    )
                ),
            )
            for knowledge_base in result.items
        ],
        total=result.total,
    )


@router.get("/search/files", response_model=KnowledgeFileListResponse)
async def search_knowledge_files(
    query: Optional[str] = None,
    page: Optional[int] = 1,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    page = max(page, 1)
    limit = PAGE_ITEM_COUNT
    skip = (page - 1) * limit

    filter = {}
    if query:
        filter["query"] = query

    groups = Groups.get_groups_by_member_id(user.id, db=db)
    if groups:
        filter["group_ids"] = [group.id for group in groups]

    filter["user_id"] = user.id

    return Knowledges.search_knowledge_files(
        filter=filter, skip=skip, limit=limit, db=db
    )


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


@router.post("/create", response_model=Optional[KnowledgeResponse])
async def create_new_knowledge(
    request: Request,
    form_data: KnowledgeForm,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    if user.role != "admin" and not has_permission(
        user.id, "workspace.knowledge", request.app.state.config.USER_PERMISSIONS, db=db
    ):
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=ERROR_MESSAGES.UNAUTHORIZED,
        )

    # Check if user can share publicly
    if (
        user.role != "admin"
        and form_data.access_control == None
        and not has_permission(
            user.id,
            "sharing.public_knowledge",
            request.app.state.config.USER_PERMISSIONS,
            db=db,
        )
    ):
        form_data.access_control = {}

    knowledge = Knowledges.insert_new_knowledge(user.id, form_data, db=db)

    if knowledge:
        # Embed knowledge base for semantic search
        await embed_knowledge_base_metadata(
            request,
            knowledge.id,
            knowledge.name,
            knowledge.description,
        )
        return knowledge
    else:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.FILE_EXISTS,
        )


############################
# ReindexKnowledgeFiles
############################


@router.post("/reindex", response_model=bool)
async def reindex_knowledge_files(
    request: Request,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    if user.role != "admin":
        raise HTTPException(
            status_code=status.HTTP_401_UNAUTHORIZED,
            detail=ERROR_MESSAGES.UNAUTHORIZED,
        )

    knowledge_bases = Knowledges.get_knowledge_bases(db=db)

    log.info(f"Starting reindexing for {len(knowledge_bases)} knowledge bases")

    for knowledge_base in knowledge_bases:
        try:
            files = Knowledges.get_files_by_id(knowledge_base.id, db=db)
            try:
                if VECTOR_DB_CLIENT.has_collection(collection_name=knowledge_base.id):
                    VECTOR_DB_CLIENT.delete_collection(
                        collection_name=knowledge_base.id
                    )
            except Exception as e:
                log.error(f"Error deleting collection {knowledge_base.id}: {str(e)}")
                continue  # Skip, don't raise

            failed_files = []
            for file in files:
                try:
                    await run_in_threadpool(
                        process_file,
                        request,
                        ProcessFileForm(
                            file_id=file.id, collection_name=knowledge_base.id
                        ),
                        user=user,
                        db=db,
                    )
                except Exception as e:
                    log.error(
                        f"Error processing file {file.filename} (ID: {file.id}): {str(e)}"
                    )
                    failed_files.append({"file_id": file.id, "error": str(e)})
                    continue

        except Exception as e:
            log.error(f"Error processing knowledge base {knowledge_base.id}: {str(e)}")
            # Don't raise, just continue
            continue

        if failed_files:
            log.warning(
                f"Failed to process {len(failed_files)} files in knowledge base {knowledge_base.id}"
            )
            for failed in failed_files:
                log.warning(f"File ID: {failed['file_id']}, Error: {failed['error']}")

    log.info(f"Reindexing completed.")
    return True


############################
# ReindexKnowledgeBases
############################


@router.post("/metadata/reindex", response_model=dict)
async def reindex_knowledge_base_metadata_embeddings(
    request: Request,
    user=Depends(get_admin_user),
    db: Session = Depends(get_session),
):
    """Batch embed all existing knowledge bases. Admin only."""
    knowledge_bases = Knowledges.get_knowledge_bases(db=db)
    log.info(f"Reindexing embeddings for {len(knowledge_bases)} knowledge bases")

    success_count = 0
    for kb in knowledge_bases:
        if await embed_knowledge_base_metadata(request, kb.id, kb.name, kb.description):
            success_count += 1

    log.info(f"Embedding reindex complete: {success_count}/{len(knowledge_bases)}")
    return {"total": len(knowledge_bases), "success": success_count}


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


class KnowledgeFilesResponse(KnowledgeResponse):
    files: Optional[list[FileMetadataResponse]] = None
    write_access: Optional[bool] = False


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

    if knowledge:
        if (
            user.role == "admin"
            or knowledge.user_id == user.id
            or has_access(user.id, "read", knowledge.access_control, db=db)
        ):

            return KnowledgeFilesResponse(
                **knowledge.model_dump(),
                write_access=(
                    user.id == knowledge.user_id
                    or (user.role == "admin" and BYPASS_ADMIN_ACCESS_CONTROL)
                    or has_access(user.id, "write", knowledge.access_control, db=db)
                ),
            )
        else:
            raise HTTPException(
                status_code=status.HTTP_401_UNAUTHORIZED,
                detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
            )
    else:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


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


@router.post("/{id}/update", response_model=Optional[KnowledgeFilesResponse])
async def update_knowledge_by_id(
    request: Request,
    id: str,
    form_data: KnowledgeForm,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )
    # Is the user the original creator, in a group with write access, or an admin
    if (
        knowledge.user_id != user.id
        and not has_access(user.id, "write", knowledge.access_control, db=db)
        and user.role != "admin"
    ):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )

    # Check if user can share publicly
    if (
        user.role != "admin"
        and form_data.access_control == None
        and not has_permission(
            user.id,
            "sharing.public_knowledge",
            request.app.state.config.USER_PERMISSIONS,
            db=db,
        )
    ):
        form_data.access_control = {}

    knowledge = Knowledges.update_knowledge_by_id(id=id, form_data=form_data, db=db)
    if knowledge:
        # Re-embed knowledge base for semantic search
        await embed_knowledge_base_metadata(
            request,
            knowledge.id,
            knowledge.name,
            knowledge.description,
        )
        return KnowledgeFilesResponse(
            **knowledge.model_dump(),
            files=Knowledges.get_file_metadatas_by_id(knowledge.id, db=db),
        )
    else:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ID_TAKEN,
        )


############################
# GetKnowledgeFilesById
############################


@router.get("/{id}/files", response_model=KnowledgeFileListResponse)
async def get_knowledge_files_by_id(
    id: str,
    query: Optional[str] = None,
    view_option: Optional[str] = None,
    order_by: Optional[str] = None,
    direction: Optional[str] = None,
    page: Optional[int] = 1,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):

    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    if not (
        user.role == "admin"
        or knowledge.user_id == user.id
        or has_access(user.id, "read", knowledge.access_control, db=db)
    ):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )

    page = max(page, 1)

    limit = 30
    skip = (page - 1) * limit

    filter = {}
    if query:
        filter["query"] = query
    if view_option:
        filter["view_option"] = view_option
    if order_by:
        filter["order_by"] = order_by
    if direction:
        filter["direction"] = direction

    return Knowledges.search_files_by_id(
        id, user.id, filter=filter, skip=skip, limit=limit, db=db
    )


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


class KnowledgeFileIdForm(BaseModel):
    file_id: str


@router.post("/{id}/file/add", response_model=Optional[KnowledgeFilesResponse])
def add_file_to_knowledge_by_id(
    request: Request,
    id: str,
    form_data: KnowledgeFileIdForm,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    if (
        knowledge.user_id != user.id
        and not has_access(user.id, "write", knowledge.access_control, db=db)
        and user.role != "admin"
    ):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )

    file = Files.get_file_by_id(form_data.file_id, db=db)
    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(
            request,
            ProcessFileForm(file_id=form_data.file_id, collection_name=id),
            user=user,
            db=db,
        )

        # Add file to knowledge base
        Knowledges.add_file_to_knowledge_by_id(
            knowledge_id=id, file_id=form_data.file_id, user_id=user.id, db=db
        )
    except Exception as e:
        log.debug(e)
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e),
        )

    if knowledge:
        return KnowledgeFilesResponse(
            **knowledge.model_dump(),
            files=Knowledges.get_file_metadatas_by_id(knowledge.id, db=db),
        )
    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(
    request: Request,
    id: str,
    form_data: KnowledgeFileIdForm,
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    if (
        knowledge.user_id != user.id
        and not has_access(user.id, "write", knowledge.access_control, db=db)
        and user.role != "admin"
    ):

        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )

    file = Files.get_file_by_id(form_data.file_id, db=db)
    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(
            request,
            ProcessFileForm(file_id=form_data.file_id, collection_name=id),
            user=user,
            db=db,
        )
    except Exception as e:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=str(e),
        )

    if knowledge:
        return KnowledgeFilesResponse(
            **knowledge.model_dump(),
            files=Knowledges.get_file_metadatas_by_id(knowledge.id, db=db),
        )
    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,
    delete_file: bool = Query(True),
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    if (
        knowledge.user_id != user.id
        and not has_access(user.id, "write", knowledge.access_control, db=db)
        and user.role != "admin"
    ):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )

    file = Files.get_file_by_id(form_data.file_id, db=db)
    if not file:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    Knowledges.remove_file_from_knowledge_by_id(
        knowledge_id=id, file_id=form_data.file_id, db=db
    )

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

        VECTOR_DB_CLIENT.delete(
            collection_name=knowledge.id, filter={"hash": file.hash}
        )  # Remove by hash as well in case of duplicates
    except Exception as e:
        log.debug("This was most likely caused by bypassing embedding processing")
        log.debug(e)
        pass

    if delete_file:
        try:
            # Remove the file's collection from vector database
            file_collection = f"file-{form_data.file_id}"
            if VECTOR_DB_CLIENT.has_collection(collection_name=file_collection):
                VECTOR_DB_CLIENT.delete_collection(collection_name=file_collection)
        except Exception as e:
            log.debug("This was most likely caused by bypassing embedding processing")
            log.debug(e)
            pass

        # Delete file from database
        Files.delete_file_by_id(form_data.file_id, db=db)

    if knowledge:
        return KnowledgeFilesResponse(
            **knowledge.model_dump(),
            files=Knowledges.get_file_metadatas_by_id(knowledge.id, db=db),
        )
    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_verified_user), db: Session = Depends(get_session)
):
    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    if (
        knowledge.user_id != user.id
        and not has_access(user.id, "write", knowledge.access_control, db=db)
        and user.role != "admin"
    ):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )

    log.info(f"Deleting knowledge base: {id} (name: {knowledge.name})")

    # Get all models
    models = Models.get_all_models(db=db)
    log.info(f"Found {len(models)} models to check for knowledge base {id}")

    # Update models that reference this knowledge base
    for model in models:
        if model.meta and hasattr(model.meta, "knowledge"):
            knowledge_list = model.meta.knowledge or []
            # Filter out the deleted knowledge base
            updated_knowledge = [k for k in knowledge_list if k.get("id") != id]

            # If the knowledge list changed, update the model
            if len(updated_knowledge) != len(knowledge_list):
                log.info(f"Updating model {model.id} to remove knowledge base {id}")
                model.meta.knowledge = updated_knowledge
                # Create a ModelForm for the update
                model_form = ModelForm(
                    id=model.id,
                    name=model.name,
                    base_model_id=model.base_model_id,
                    meta=model.meta,
                    params=model.params,
                    access_control=model.access_control,
                    is_active=model.is_active,
                )
                Models.update_model_by_id(model.id, model_form, db=db)

    # Clean up vector DB
    try:
        VECTOR_DB_CLIENT.delete_collection(collection_name=id)
    except Exception as e:
        log.debug(e)
        pass

    # Remove knowledge base embedding
    remove_knowledge_base_metadata_embedding(id)

    result = Knowledges.delete_knowledge_by_id(id=id, db=db)
    return result


############################
# ResetKnowledgeById
############################


@router.post("/{id}/reset", response_model=Optional[KnowledgeResponse])
async def reset_knowledge_by_id(
    id: str, user=Depends(get_verified_user), db: Session = Depends(get_session)
):
    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    if (
        knowledge.user_id != user.id
        and not has_access(user.id, "write", knowledge.access_control, db=db)
        and user.role != "admin"
    ):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )

    try:
        VECTOR_DB_CLIENT.delete_collection(collection_name=id)
    except Exception as e:
        log.debug(e)
        pass

    knowledge = Knowledges.reset_knowledge_by_id(id=id, db=db)
    return knowledge


############################
# AddFilesToKnowledge
############################


@router.post("/{id}/files/batch/add", response_model=Optional[KnowledgeFilesResponse])
async def add_files_to_knowledge_batch(
    request: Request,
    id: str,
    form_data: list[KnowledgeFileIdForm],
    user=Depends(get_verified_user),
    db: Session = Depends(get_session),
):
    """
    Add multiple files to a knowledge base
    """
    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    if (
        knowledge.user_id != user.id
        and not has_access(user.id, "write", knowledge.access_control, db=db)
        and user.role != "admin"
    ):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.ACCESS_PROHIBITED,
        )

    # Get files content
    log.info(f"files/batch/add - {len(form_data)} files")
    files: List[FileModel] = []
    for form in form_data:
        file = Files.get_file_by_id(form.file_id, db=db)
        if not file:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=f"File {form.file_id} not found",
            )
        files.append(file)

    # Process files
    try:
        result = await process_files_batch(
            request=request,
            form_data=BatchProcessFilesForm(files=files, collection_name=id),
            user=user,
            db=db,
        )
    except Exception as e:
        log.error(
            f"add_files_to_knowledge_batch: Exception occurred: {e}", exc_info=True
        )
        raise HTTPException(status_code=status.HTTP_400_BAD_REQUEST, detail=str(e))

    # Only add files that were successfully processed
    successful_file_ids = [r.file_id for r in result.results if r.status == "completed"]
    for file_id in successful_file_ids:
        Knowledges.add_file_to_knowledge_by_id(
            knowledge_id=id, file_id=file_id, user_id=user.id, db=db
        )

    # If there were any errors, include them in the response
    if result.errors:
        error_details = [f"{err.file_id}: {err.error}" for err in result.errors]
        return KnowledgeFilesResponse(
            **knowledge.model_dump(),
            files=Knowledges.get_file_metadatas_by_id(knowledge.id, db=db),
            warnings={
                "message": "Some files failed to process",
                "errors": error_details,
            },
        )

    return KnowledgeFilesResponse(
        **knowledge.model_dump(),
        files=Knowledges.get_file_metadatas_by_id(knowledge.id, db=db),
    )


############################
# ExportKnowledgeById
############################


@router.get("/{id}/export")
async def export_knowledge_by_id(
    id: str, user=Depends(get_admin_user), db: Session = Depends(get_session)
):
    """
    Export a knowledge base as a zip file containing .txt files.
    Admin only.
    """

    knowledge = Knowledges.get_knowledge_by_id(id=id, db=db)
    if not knowledge:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )

    files = Knowledges.get_files_by_id(id, db=db)

    # Create zip file in memory
    zip_buffer = io.BytesIO()
    with zipfile.ZipFile(zip_buffer, "w", zipfile.ZIP_DEFLATED) as zf:
        for file in files:
            content = file.data.get("content", "") if file.data else ""
            if content:
                # Use original filename with .txt extension
                filename = file.filename
                if not filename.endswith(".txt"):
                    filename = f"{filename}.txt"
                zf.writestr(filename, content)

    zip_buffer.seek(0)

    # Sanitize knowledge name for filename
    safe_name = "".join(c if c.isalnum() or c in " -_" else "_" for c in knowledge.name)
    zip_filename = f"{safe_name}.zip"

    return StreamingResponse(
        zip_buffer,
        media_type="application/zip",
        headers={"Content-Disposition": f"attachment; filename={zip_filename}"},
    )
