import datetime
import time
import dropbox
from dropbox.files import WriteMode
from dropbox.exceptions import ApiError, AuthError
import sys,os
import firebase_handler as fbh

TOKEN=fbh.fb_get("d2_accesstoken")
APP_KEY=os.environ['DROPBOX_APP_KEY']
APP_SECRET=os.environ['DROPBOX_APP_SECRET']
REFRESH_TOKEN=fbh.fb_get("d2_refreshtoken")

#os.environ['DROP_DIR2']="C:/dockers/chroma/chroma1/"
#os.environ['APP_PATH']="/"
print("token::",TOKEN)

with dropbox.Dropbox(oauth2_access_token=TOKEN,app_key=APP_KEY,app_secret=APP_SECRET,oauth2_refresh_token=REFRESH_TOKEN) as dbx: #,app_key=APP_KEY,app_secret=APP_SECRET,oauth2_refresh_token=REFRESH_TOKEN) as dbx:
    # Check that the access token is valid
    try:
        dbx.users_get_current_account()
        if (TOKEN != dbx._oauth2_access_token):
            fbh.fb_update("d2_accesstoken",dbx._oauth2_access_token)
            TOKEN=dbx._oauth2_access_token
        print("dropbox connection ok,",dbx._oauth2_access_token)
        print(dbx._oauth2_refresh_token)
    except AuthError:
        try:
            dbx.check_and_refresh_access_token()
            fbh.fb_update("d2_accesstoken",dbx._oauth2_access_token)
            print("dropbox connection refreshed and updated",dbx._oauth2_access_token)
            print(dbx._oauth2_refresh_token)
        except Exception:
            sys.exit("ERROR: Invalid access token; try re-generating an "
                "access token from the app console on the web.")

def normalizeFilename(filename):
    while '//' in filename:
        filename = filename.replace('//', '/')
    return filename

def getDropboxFilename(localFilename):
    """ localFilename is $DROP_DIR2/<subpath>/<filename>"""
    """ dropboxFilename is $APP_PATH/<subpath>/<filename"""
    #if not localFilename.startswith(os.environ['DROP_DIR2']):
    #    localFilename=os.environ['DROP_DIR2']+localFilename
    localFilename=normalizeFilename(localFilename)
    return normalizeFilename(localFilename.replace(os.environ['DROP_DIR2'],"/",1).replace("/",os.environ['APP_PATH'],1))

def getLocalFilename(dropboxFilename):
    """ localFilename is $DROP_DIR2/<subpath>/<filename>"""
    """ dropboxFilename is $APP_PATH/<subpath>/<filename"""
    #if not dropboxFilename.startswith(os.environ['APP_PATH']):
    #    dropboxFilename=os.environ['APP_PATH']+dropboxFilename
    dropboxFilename=normalizeFilename(dropboxFilename)
    return normalizeFilename(dropboxFilename.replace(os.environ['APP_PATH'],"/",1).replace("/",os.environ['DROP_DIR2'],1))

def backupFile(localFilename):
    """Upload a file.
    Return the request response, or None in case of error.
    This will also create directory on dropbox if needed
    """
    global TOKEN
    localFilename=normalizeFilename(localFilename) 
    dropboxFilename=getDropboxFilename(localFilename)
    print("backing file ",localFilename," to ",dropboxFilename)
    mode = dropbox.files.WriteMode.overwrite
    mtime = os.path.getmtime(localFilename)
    with open(localFilename, 'rb') as f:
        data = f.read()
    try:
        res = dbx.files_upload(
            data, dropboxFilename, mode,
            client_modified=datetime.datetime(*time.gmtime(mtime)[:6]),
            mute=True)
        if (TOKEN != dbx._oauth2_access_token):
            fbh.fb_update("d2_accesstoken",dbx._oauth2_access_token)
            TOKEN=dbx._oauth2_access_token
            print(dbx._oauth2_refresh_token)
    except dropbox.exceptions.ApiError as err:
        print('*** API error', err)
        return None
    print('uploaded as', res.name.encode('utf8'))
    return res

def restoreFile(dropboxFilename):
    """Download a file.
    Return the bytes of the file, or None if it doesn't exist.
    Will create dir+subdirs if possible
    """
    global TOKEN
    dropboxFilename=normalizeFilename(dropboxFilename)
    localFilename=getLocalFilename(dropboxFilename)
    print("restoring file ",localFilename," from ",dropboxFilename)
    try:
        md, res = dbx.files_download(dropboxFilename)
        if (TOKEN != dbx._oauth2_access_token):
            fbh.fb_update("d2_accesstoken",dbx._oauth2_access_token)
            TOKEN=dbx._oauth2_access_token
            print(dbx._oauth2_refresh_token)
    except dropbox.exceptions.HttpError as err:
        print('*** HTTP error', err)
        return None
    data = res.content
    print(len(data), 'bytes; md:', md)
    localdir=os.path.dirname(localFilename)
    if not os.path.exists(localdir):
        os.makedirs(localdir)
    with open(localFilename, 'wb') as f:
        f.write(data)
    return data

def backupFolder(localFolder):
    """ list all files in folder and subfolder and upload them"""
    print("backup folder called for ",localFolder)
    if not localFolder.startswith(os.environ['DROP_DIR2']):
        localFolder=os.environ['DROP_DIR2']+localFolder
    filenames=[]
    for (root,dirs,files) in os.walk(localFolder, topdown=True):
        print(root)
        for filename in files:
            filenames.append(root+"/"+filename)
            print(root+"/"+filename)
            backupFile(root+"/"+filename)


def restoreFolder(dropboxFolder):
    """ list all files in dropbox folder and subfolders and restore them"""
    global TOKEN
    if not dropboxFolder.startswith(os.environ['APP_PATH']):
        dropboxFolder=os.environ['APP_PATH']+dropboxFolder
    try:
        res=dbx.files_list_folder(dropboxFolder)
        if (TOKEN != dbx._oauth2_access_token):
            fbh.fb_update("d2_accesstoken",dbx._oauth2_access_token)
            TOKEN=dbx._oauth2_access_token
            print(dbx._oauth2_refresh_token)
    except dropbox.exceptions.ApiError as err:
        print('Folder listing failed for', dropboxFolder, '-- assumed empty:', err)
        return
    except dropbox.exceptions.AuthError as err1:
        print('Folder listing failed for', dropboxFolder, '-- assumed empty:', err1)
        return
    for entry in res.entries:
        if (isinstance(entry, dropbox.files.FileMetadata)):
            restoreFile(entry.path_display)
        else:
            try:
                restoreFolder(entry.path_display)
            except Exception:
                print("Error restoring folder,",entry.path_display)
        print(entry.path_display)