import os
from typing import List

import msal
import requests
from fastapi import HTTPException
from google.auth.transport.requests import Request as GoogleRequest
from google.oauth2.credentials import Credentials
from googleapiclient.discovery import build
from logger import get_logger
from requests import HTTPError

logger = get_logger(__name__)


def get_google_drive_files_by_id(credentials: dict, file_ids: List[str]):
    """
    Retrieve files from Google Drive by their IDs.

    Args:
        credentials (dict): The credentials for accessing Google Drive.
        file_ids (list): The list of file IDs to retrieve.

    Returns:
        list: A list of dictionaries containing the metadata of each file or an error message.
    """
    logger.info("Retrieving Google Drive files with file_ids: %s", file_ids)
    creds = Credentials.from_authorized_user_info(credentials)
    if creds.expired and creds.refresh_token:
        creds.refresh(GoogleRequest())
        logger.info("Google Drive credentials refreshed")

    try:
        service = build("drive", "v3", credentials=creds)
        files = []

        for file_id in file_ids:
            result = (
                service.files()
                .get(fileId=file_id, fields="id, name, mimeType, modifiedTime")
                .execute()
            )

            files.append(
                {
                    "name": result["name"],
                    "id": result["id"],
                    "is_folder": result["mimeType"]
                    == "application/vnd.google-apps.folder",
                    "last_modified": result["modifiedTime"],
                    "mime_type": result["mimeType"],
                }
            )

        logger.info("Google Drive files retrieved successfully: %s", len(files))
        return files
    except HTTPError as error:
        logger.error("An error occurred while retrieving Google Drive files: %s", error)
        return {"error": f"An error occurred: {error}"}


def get_google_drive_files(
    credentials: dict, folder_id: str = None, recursive: bool = False
):
    """
    Retrieve files from Google Drive.

    Args:
        credentials (dict): The credentials for accessing Google Drive.
        folder_id (str, optional): The folder ID to filter files. Defaults to None.
        recursive (bool, optional): If True, fetch files from all subfolders. Defaults to False.

    Returns:
        dict: A dictionary containing the list of files or an error message.
    """
    logger.info("Retrieving Google Drive files with folder_id: %s", folder_id)
    creds = Credentials.from_authorized_user_info(credentials)
    if creds.expired and creds.refresh_token:
        creds.refresh(GoogleRequest())
        logger.info("Google Drive credentials refreshed")
        # Updating the credentials in the database

    try:
        service = build("drive", "v3", credentials=creds)
        if folder_id:
            query = f"'{folder_id}' in parents"
        else:
            query = "'root' in parents or sharedWithMe"
        page_token = None
        files = []

        while True:
            results = (
                service.files()
                .list(
                    q=query,
                    pageSize=100,
                    fields="nextPageToken, files(id, name, mimeType, modifiedTime)",
                    pageToken=page_token,
                )
                .execute()
            )
            items = results.get("files", [])

            if not items:
                logger.info("No files found in Google Drive")
                break

            for item in items:
                files.append(
                    {
                        "name": item["name"],
                        "id": item["id"],
                        "is_folder": item["mimeType"]
                        == "application/vnd.google-apps.folder",
                        "last_modified": item["modifiedTime"],
                        "mime_type": item["mimeType"],
                    }
                )

                # If recursive is True and the item is a folder, get files from the folder
                if item["name"] == "Monotype":
                    logger.warning(item)
                if (
                    recursive
                    and item["mimeType"] == "application/vnd.google-apps.folder"
                ):
                    logger.warning(
                        "Calling Recursive for folder: %s",
                        item["name"],
                    )
                    files.extend(
                        get_google_drive_files(credentials, item["id"], recursive)
                    )

            page_token = results.get("nextPageToken", None)
            if page_token is None:
                break

        logger.info("Google Drive files retrieved successfully: %s", len(files))
        return files
    except HTTPError as error:
        logger.error("An error occurred while retrieving Google Drive files: %s", error)
        return {"error": f"An error occurred: {error}"}


CLIENT_ID = os.getenv("SHAREPOINT_CLIENT_ID")
AUTHORITY = "https://login.microsoftonline.com/common"
BACKEND_URL = os.getenv("BACKEND_URL", "http://localhost:5050")
REDIRECT_URI = f"{BACKEND_URL}/sync/azure/oauth2callback"
SCOPE = [
    "https://graph.microsoft.com/Files.Read",
    "https://graph.microsoft.com/User.Read",
    "https://graph.microsoft.com/Sites.Read.All",
]


def get_azure_token_data(credentials):
    if "access_token" not in credentials:
        raise HTTPException(status_code=401, detail="Invalid token data")
    return credentials


def refresh_azure_token(credentials):
    if "refresh_token" not in credentials:
        raise HTTPException(status_code=401, detail="No refresh token available")

    client = msal.PublicClientApplication(CLIENT_ID, authority=AUTHORITY)
    result = client.acquire_token_by_refresh_token(
        credentials["refresh_token"], scopes=SCOPE
    )
    if "access_token" not in result:
        raise HTTPException(status_code=400, detail="Failed to refresh token")

    return result


def get_azure_headers(token_data):
    return {
        "Authorization": f"Bearer {token_data['access_token']}",
        "Accept": "application/json",
    }


def list_azure_files(credentials, folder_id=None, recursive=False):
    def fetch_files(endpoint, headers):
        response = requests.get(endpoint, headers=headers)
        if response.status_code == 401:
            token_data = refresh_azure_token(credentials)
            headers = get_azure_headers(token_data)
            response = requests.get(endpoint, headers=headers)
        if response.status_code != 200:
            return {"error": response.text}
        return response.json().get("value", [])

    token_data = get_azure_token_data(credentials)
    headers = get_azure_headers(token_data)
    endpoint = f"https://graph.microsoft.com/v1.0/me/drive/root/children"
    if folder_id:
        endpoint = (
            f"https://graph.microsoft.com/v1.0/me/drive/items/{folder_id}/children"
        )

    items = fetch_files(endpoint, headers)

    if not items:
        logger.info("No files found in Azure Drive")
        return []

    files = []
    for item in items:
        file_data = {
            "name": item["name"],
            "id": item["id"],
            "is_folder": "folder" in item,
            "last_modified": item["lastModifiedDateTime"],
            "mime_type": item.get("file", {}).get("mimeType", "folder"),
        }
        files.append(file_data)

        # If recursive option is enabled and the item is a folder, fetch files from it
        if recursive and file_data["is_folder"]:
            folder_files = list_azure_files(
                credentials, folder_id=file_data["id"], recursive=True
            )

            files.extend(folder_files)

    logger.info("Azure Drive files retrieved successfully: %s", len(files))
    return files


def get_azure_files_by_id(credentials: dict, file_ids: List[str]):
    """
    Retrieve files from Azure Drive by their IDs.

    Args:
        credentials (dict): The credentials for accessing Azure Drive.
        file_ids (list): The list of file IDs to retrieve.

    Returns:
        list: A list of dictionaries containing the metadata of each file or an error message.
    """
    logger.info("Retrieving Azure Drive files with file_ids: %s", file_ids)
    token_data = get_azure_token_data(credentials)
    headers = get_azure_headers(token_data)
    files = []

    for file_id in file_ids:
        endpoint = f"https://graph.microsoft.com/v1.0/me/drive/items/{file_id}"
        response = requests.get(endpoint, headers=headers)
        if response.status_code == 401:
            token_data = refresh_azure_token(credentials)
            headers = get_azure_headers(token_data)
            response = requests.get(endpoint, headers=headers)
        if response.status_code != 200:
            logger.error(
                "An error occurred while retrieving Azure Drive files: %s",
                response.text,
            )
            return {"error": response.text}

        result = response.json()
        files.append(
            {
                "name": result["name"],
                "id": result["id"],
                "is_folder": "folder" in result,
                "last_modified": result["lastModifiedDateTime"],
                "mime_type": result.get("file", {}).get("mimeType", "folder"),
            }
        )

    logger.info("Azure Drive files retrieved successfully: %s", len(files))
    return files