# File: backend/dropbox_utils.py
import dropbox
import requests
import json
import os

REDIRECT_URI = "https://docusort.vercel.app/dropbox-callback"

def get_dropbox_secrets():
    """Securely load Dropbox keys from Hugging Face Environment Secrets"""
    secret_str = os.getenv("DROPBOX_SECRET_JSON")
    if not secret_str:
        print("WARNING: DROPBOX_SECRET_JSON not found in environment!")
        return {"app_key": "MISSING", "app_secret": "MISSING"}
    return json.loads(secret_str)

def get_dropbox_auth_url():
    secrets = get_dropbox_secrets()
    return f"https://www.dropbox.com/oauth2/authorize?client_id={secrets['app_key']}&response_type=code&redirect_uri={REDIRECT_URI}&token_access_type=offline&force_reapprove=true"

def exchange_code_for_token(code: str):
    secrets = get_dropbox_secrets()
    token_url = "https://api.dropboxapi.com/oauth2/token"
    data = {
        "code": code,
        "grant_type": "authorization_code",
        "client_id": secrets['app_key'],
        "client_secret": secrets['app_secret'],
        "redirect_uri": REDIRECT_URI,
    }
    response = requests.post(token_url, data=data)
    response.raise_for_status()
    return response.json()

def get_dropbox_client(access_token: str):
    return dropbox.Dropbox(access_token)

def get_user_email(dbx):
    account = dbx.users_get_current_account()
    return account.email

def list_files_in_folder(dbx, folder_path=""):
    if folder_path == "root":
        folder_path = ""
    res = dbx.files_list_folder(folder_path)
    items = []
    for entry in res.entries:
        if isinstance(entry, dropbox.files.FolderMetadata):
            items.append({
                "id": entry.path_display,
                "name": entry.name,
                "mimeType": "application/vnd.google-apps.folder",
                "webViewLink": "",
                "iconLink": ""
            })
        elif isinstance(entry, dropbox.files.FileMetadata):
            items.append({
                "id": entry.path_display,
                "name": entry.name,
                "mimeType": "application/octet-stream",
                "webViewLink": f"https://www.dropbox.com/preview{entry.path_display}?role=personal",
                "iconLink": "https://cfl.dropboxstatic.com/static/images/favicon-vflUeLeeY.ico",
                "size": entry.size,                  
                "content_hash": entry.content_hash   
            })
            
    return items