import logging
import os
import shutil
import uuid
from pathlib import Path
from typing import Optional
from pydantic import BaseModel
import mimetypes


from open_webui.apps.webui.models.files import FileForm, FileModel, Files
from open_webui.apps.retrieval.main import process_file, ProcessFileForm

from open_webui.config import UPLOAD_DIR
from open_webui.env import SRC_LOG_LEVELS
from open_webui.constants import ERROR_MESSAGES


from fastapi import APIRouter, Depends, File, HTTPException, UploadFile, status
from fastapi.responses import FileResponse, StreamingResponse


from open_webui.utils.utils import get_admin_user, get_verified_user

log = logging.getLogger(__name__)
log.setLevel(SRC_LOG_LEVELS["MODELS"])


router = APIRouter()

############################
# Upload File
############################


@router.post("/")
def upload_file(file: UploadFile = File(...), user=Depends(get_verified_user)):
    log.info(f"file.content_type: {file.content_type}")
    try:
        unsanitized_filename = file.filename
        filename = os.path.basename(unsanitized_filename)

        # replace filename with uuid
        id = str(uuid.uuid4())
        name = filename
        filename = f"{id}_{filename}"
        file_path = f"{UPLOAD_DIR}/{filename}"

        contents = file.file.read()
        if len(contents) == 0:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=ERROR_MESSAGES.EMPTY_CONTENT,
            )

        with open(file_path, "wb") as f:
            f.write(contents)
            f.close()

        file = Files.insert_new_file(
            user.id,
            FileForm(
                **{
                    "id": id,
                    "filename": filename,
                    "meta": {
                        "name": name,
                        "content_type": file.content_type,
                        "size": len(contents),
                        "path": file_path,
                    },
                }
            ),
        )

        try:
            process_file(ProcessFileForm(file_id=id))
            file = Files.get_file_by_id(id=id)
        except Exception as e:
            log.exception(e)
            log.error(f"Error processing file: {file.id}")

        if file:
            return file
        else:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=ERROR_MESSAGES.DEFAULT("Error uploading file"),
            )

    except Exception as e:
        log.exception(e)
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.DEFAULT(e),
        )


############################
# List Files
############################


@router.get("/", response_model=list[FileModel])
async def list_files(user=Depends(get_verified_user)):
    if user.role == "admin":
        files = Files.get_files()
    else:
        files = Files.get_files_by_user_id(user.id)
    return files


############################
# Delete All Files
############################


@router.delete("/all")
async def delete_all_files(user=Depends(get_admin_user)):
    result = Files.delete_all_files()

    if result:
        folder = f"{UPLOAD_DIR}"
        try:
            # Check if the directory exists
            if os.path.exists(folder):
                # Iterate over all the files and directories in the specified directory
                for filename in os.listdir(folder):
                    file_path = os.path.join(folder, filename)
                    try:
                        if os.path.isfile(file_path) or os.path.islink(file_path):
                            os.unlink(file_path)  # Remove the file or link
                        elif os.path.isdir(file_path):
                            shutil.rmtree(file_path)  # Remove the directory
                    except Exception as e:
                        print(f"Failed to delete {file_path}. Reason: {e}")
            else:
                print(f"The directory {folder} does not exist")
        except Exception as e:
            print(f"Failed to process the directory {folder}. Reason: {e}")

        return {"message": "All files deleted successfully"}
    else:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail=ERROR_MESSAGES.DEFAULT("Error deleting files"),
        )


############################
# Get File By Id
############################


@router.get("/{id}", response_model=Optional[FileModel])
async def get_file_by_id(id: str, user=Depends(get_verified_user)):
    file = Files.get_file_by_id(id)

    if file and (file.user_id == user.id or user.role == "admin"):
        return file
    else:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


############################
# Get File Data Content By Id
############################


@router.get("/{id}/data/content")
async def get_file_data_content_by_id(id: str, user=Depends(get_verified_user)):
    file = Files.get_file_by_id(id)

    if file and (file.user_id == user.id or user.role == "admin"):
        return {"content": file.data.get("content", "")}
    else:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


############################
# Update File Data Content By Id
############################


class ContentForm(BaseModel):
    content: str


@router.post("/{id}/data/content/update")
async def update_file_data_content_by_id(
    id: str, form_data: ContentForm, user=Depends(get_verified_user)
):
    file = Files.get_file_by_id(id)

    if file and (file.user_id == user.id or user.role == "admin"):
        try:
            process_file(ProcessFileForm(file_id=id, content=form_data.content))
            file = Files.get_file_by_id(id=id)
        except Exception as e:
            log.exception(e)
            log.error(f"Error processing file: {file.id}")

        return {"content": file.data.get("content", "")}
    else:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


############################
# Get File Content By Id
############################


@router.get("/{id}/content", response_model=Optional[FileModel])
async def get_file_content_by_id(id: str, user=Depends(get_verified_user)):
    file = Files.get_file_by_id(id)

    if file and (file.user_id == user.id or user.role == "admin"):
        file_path = Path(file.meta["path"])

        # Check if the file already exists in the cache
        if file_path.is_file():
            print(f"file_path: {file_path}")
            headers = {
                "Content-Disposition": f'attachment; filename="{file.meta.get("name", file.filename)}"'
            }
            return FileResponse(file_path, headers=headers)
        else:
            raise HTTPException(
                status_code=status.HTTP_404_NOT_FOUND,
                detail=ERROR_MESSAGES.NOT_FOUND,
            )
    else:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


@router.get("/{id}/content/{file_name}", response_model=Optional[FileModel])
async def get_file_content_by_id(id: str, user=Depends(get_verified_user)):
    file = Files.get_file_by_id(id)

    if file and (file.user_id == user.id or user.role == "admin"):
        file_path = file.meta.get("path")
        if file_path:
            file_path = Path(file_path)

            # Check if the file already exists in the cache
            if file_path.is_file():
                print(f"file_path: {file_path}")
                return FileResponse(file_path)
            else:
                raise HTTPException(
                    status_code=status.HTTP_404_NOT_FOUND,
                    detail=ERROR_MESSAGES.NOT_FOUND,
                )
        else:
            # File path doesn’t exist, return the content as .txt if possible
            file_content = file.content.get("content", "")
            file_name = file.filename

            # Create a generator that encodes the file content
            def generator():
                yield file_content.encode("utf-8")

            return StreamingResponse(
                generator(),
                media_type="text/plain",
                headers={"Content-Disposition": f"attachment; filename={file_name}"},
            )
    else:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )


############################
# Delete File By Id
############################


@router.delete("/{id}")
async def delete_file_by_id(id: str, user=Depends(get_verified_user)):
    file = Files.get_file_by_id(id)
    if file and (file.user_id == user.id or user.role == "admin"):
        result = Files.delete_file_by_id(id)
        if result:
            return {"message": "File deleted successfully"}
        else:
            raise HTTPException(
                status_code=status.HTTP_400_BAD_REQUEST,
                detail=ERROR_MESSAGES.DEFAULT("Error deleting file"),
            )
    else:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=ERROR_MESSAGES.NOT_FOUND,
        )