"""Connector for CRUD sharepoint operations."""

import asyncio
from concurrent.futures import ThreadPoolExecutor
from dataclasses import dataclass
from datetime import datetime
from io import BytesIO
from typing import Optional
from office365.sharepoint.client_context import ClientContext
from office365.sharepoint.files.file import File


@dataclass
class ConnectorSharepoint:
    ctx: ClientContext

    @classmethod
    async def create(cls, ctx: ClientContext) -> "ConnectorSharepoint":
        """Creates an instance of the Sharepoint connector.

        Params:
            ctx: The ClientContext instance.

        Returns:
            ConnectorSharepoint: An instance of the Sharepoint connector.
        """
        return cls(ctx=ctx)

    @classmethod
    def get_client_context_from_username_password(
        cls, site_url: str, username: str, password: str
    ) -> ClientContext:
        """Creates a ClientContext instance from username and password.

        Params:
            site_url: The URL of the SharePoint site.
            username: The username for authentication.
            password: The password for authentication.

        Returns:
            ClientContext: An instance of the ClientContext.
        """
        return ClientContext(site_url).with_user_credentials(username, password)

    @classmethod
    def get_client_context_from_app(
        cls, site_url: str, client_id: str, client_secret: str
    ) -> ClientContext:
        """Creates a ClientContext instance from client ID and client secret.

        Params:
            site_url: The URL of the SharePoint site.
            client_id: The client ID for authentication.
            client_secret: The client secret for authentication.

        Returns:
            ClientContext: An instance of the ClientContext.
        """
        return ClientContext(site_url).with_client_credentials(
            client_id=client_id, client_secret=client_secret
        )

    def copy_file(
        self, *, source_folder: str, source_file: str, dest_folder: str, dest_file: str
    ) -> bool:
        """Copy a file from one SharePoint location to another.

        Params:
            source_folder: Source folder path (server-relative)
            source_file: Source file name
            dest_folder: Destination folder path (server-relative)
            dest_file: Destination file name

        Returns:
            bool: True if successful, False otherwise
        """
        source_path = f"{source_folder.rstrip('/')}/{source_file}"
        dest_path = f"{dest_folder.rstrip('/')}/{dest_file}"

        source_file_obj = self.ctx.web.get_file_by_server_relative_url(source_path)
        source_file_obj.copyto(dest_path).execute_query()
        return True

    async def copy_file_async(
        self, *, source_folder: str, source_file: str, dest_folder: str, dest_file: str
    ) -> bool:
        """Copy a file from one SharePoint location to another (async version).

        Params:
            source_folder: Source folder path (server-relative)
            source_file: Source file name
            dest_folder: Destination folder path (server-relative)
            dest_file: Destination file name

        Returns:
            bool: True if successful, False otherwise
        """
        loop = asyncio.get_event_loop()
        with ThreadPoolExecutor() as executor:
            return await loop.run_in_executor(
                executor,
                lambda: self.copy_file(
                    source_folder=source_folder,
                    source_file=source_file,
                    dest_folder=dest_folder,
                    dest_file=dest_file,
                ),
            )

    def read_file(self, *, folder_path: str, file_name: str) -> bytes:
        """Read a file from SharePoint and return its content as bytes.

        Params:
            folder_path: Folder path (server-relative)
            file_name: File name

        Returns:
            bytes: File content as bytes
        """
        file_path = f"{folder_path.rstrip('/')}/{file_name}"
        response = File.open_binary(self.ctx, file_path)
        return response.content

    async def read_file_async(self, *, folder_path: str, file_name: str) -> bytes:
        """Read a file from SharePoint and return its content as bytes (async version).

        Params:
            folder_path: Folder path (server-relative)
            file_name: File name

        Returns:
            bytes: File content as bytes
        """
        loop = asyncio.get_event_loop()
        with ThreadPoolExecutor() as executor:
            return await loop.run_in_executor(
                executor,
                lambda: self.read_file(folder_path=folder_path, file_name=file_name),
            )

    def overwrite_file(
        self, *, folder_path: str, file_name: str, content: bytes
    ) -> bool:
        """Write content to a SharePoint file, overwriting if it exists.

        Params:
            folder_path: Target folder path (server-relative)
            file_name: Target file name
            content: File content as bytes

        Returns:
            bool: True if successful, False otherwise
        """
        target_folder = self.ctx.web.get_folder_by_server_relative_url(folder_path)
        target_folder.upload_file(file_name, content).execute_query()
        return True

    async def overwrite_file_async(
        self, *, folder_path: str, file_name: str, content: bytes
    ) -> bool:
        """Write content to a SharePoint file, overwriting if it exists (async version).

        Params:
            folder_path: Target folder path (server-relative)
            file_name: Target file name
            content: File content as bytes

        Returns:
            bool: True if successful, False otherwise
        """
        loop = asyncio.get_event_loop()
        with ThreadPoolExecutor() as executor:
            return await loop.run_in_executor(
                executor,
                lambda: self.overwrite_file(
                    folder_path=folder_path,
                    file_name=file_name,
                    content=content,
                ),
            )