from magic import from_file
from gapi.api import API
from posixpath import join as pathjoin
from googleapiclient.http import MediaFileUpload
import re
import os

APPLICATION_NAME = "Google Calendar API Python"
def path_translate(
        root,
        want,
        path,
        file
    ):
    l = len(root)+1
    rel = path[l:]
    new_rel = rel.replace(os.sep,'/')
    return pathjoin(want,new_rel,file)

def is_folder(element):
    return element['mimeType'] == 'application/vnd.google-apps.folder'

def split_path(path,rev=False):
    s = re.findall(r'(?:^/|[^/\x00]+)',path)
    if rev:
        return s[::-1]
    else:
        return s

def without(node,*keys):
    node_meta = set(node.keys())
    nope = set(keys)
    ret = {}
    for key in node_meta-nope:
        ret[key] = node[key]
    return ret

def remote_path_join(path,*paths):
    ret = path
    for path in paths:
        if not ret.endswith('/'):
            ret += '/'
        else:
            ret += path
    return ret

class drive_file:
    def __init__(self,
        api,
        info,
        parent
    ):
        self.id = info.pop('id')
        self.name = info.pop('name')
        self.api = api
        self.info = info
        self.parent = parent
        self._fullpath = None

    @classmethod
    def from_id(cls,id,api,parent):
        info = api.service.files().get(fileId='root').execute()
        return cls(api,info,parent)

    @property
    def fullpath(self):
        if self._fullpath is None:
            if self.parent is None:
                path = '/'
            else:
                path = pathjoin(self.parent.fullpath,self.name)
            self._fullpath = path
        return self._fullpath

    def __str__(self):
        return '{}@{}'.format(type(self).__name__,self.fullpath)

    def __repr__(self):
        return str(self)

class drive_folder(drive_file):
    def __init__(self,
        api,
        info,
        parent
    ):
        super().__init__(api,info,parent)
        self.folders = {}
        self.files = {}

    def create_folder(self,name):
        meta = {
            'name':name,
            'mimeType':'application/vnd.google-apps.folder',
            'parents' : [self.id]
        }
        info = self.api.service.files().create(body = meta).execute()
        self.folders[name] = drive_folder(self.api,info,self)

    def refresh(self):
        '''finds all files and folders from a parent'''
        parent_id = self.id
        child_list = self.__list_children__()
        for child in child_list:
            name = child['name']
            if is_folder(child):
                self.folders[name] = drive_folder(self.api,child,self)
            else:
                self.files[name] = drive_file(self.api,child,self)

    def __list_children__(self):
        page_token = None
        first = True
        while page_token or first:
            first = False
            response = self.api.service.files().list(q = "'{}' in parents and trashed = false".format(self.id),pageToken=page_token).execute()
            page_token = response.get('nextPageToken',None)
            for file in response['files']:
                yield file

    # def create_file(self,
class drive_api(API):

    def __init__(
            self,
            app_name,
            client_secret_file,
            credentials_dir,
            scopes = 'https://www.googleapis.com/auth/drive',
            version = 'v3',
        ):
        super().__init__('drive',scopes,app_name,client_secret_file,credentials_dir,version)
        self.root = drive_folder.from_id('root',self,None)

    def get_file_by_path(self,path,ret_file = True):
        '''gets a file or folder by remote path'''
        if isinstance(path,str):
            path = split_path(path)
        else:
            path = path.copy()
        parent = self.root
        end = path.pop()
        if end == '/':
            return self.root
        for sub in path:
            if sub == '/':
                pass
            else:
                try:
                    if not parent.folders:
                        parent.refresh()
                    parent = parent.folders[sub]
                except KeyError:
                    raise FileNotFoundError
        try:
            if ret_file:
                if not parent.files:
                    parent.refresh()
                ret = parent.files[end]
            else:
                if not parent.folders:
                    parent.refresh()
                ret = parent.folders[end]
            return ret
        except KeyError:
            raise FileNotFoundError

    def mkdirs(self,path):
        '''makes directories if they do not exist already'''
        if isinstance(path,str):
            path = split_path(path)
        else:
            path = path.copy()
        missing = []
        for i in range(len(path),0,-1):
            try:
                parent = self.get_file_by_path(path[:i],False)
                break
            except FileNotFoundError:
                missing.append(path[i-1])
        while len(missing) > 0:
            name = missing.pop()
            parent.create_folder(name)
            parent = parent.folders[name]
        return parent

    def upload(self,local_path,remote_path,verbose = False):
        if not isinstance(remote_path,str):
            remote_path = pathjoin(*remote_path)
        if os.path.isdir(local_path):
            for root,dirs,files in os.walk(local_path,topdown = False):
                for file in files:
                    new_path = path_translate(local_path,remote_path,root,file)
                    self.__upload_file__(os.path.join(root,file),new_path)
                    if verbose:
                        print(new_path)
            return self.get_file_by_path(remote_path,False)
        else:
            return self.__upload_file__(local_path,remote_path)

    def __upload_file__(self,local_path,remote_path):
        '''creates file if it does not exists otherwise update the file'''
        if isinstance(remote_path,str):
            remote_path = split_path(remote_path)
        else:
            remote_path = remote_path.copy()
        _upload = MediaFileUpload(local_path)

        try:
            old_file = self.get_file_by_path(remote_path)
            self.service.files().update(fileId=old_file.id,media_body=_upload).execute()
            return old_file

        except FileNotFoundError:
            path = remote_path
            end = path.pop()
            parent = self.mkdirs(path)
            parent_id = parent.id
            meta = {
                'name':end,
                'parents':[parent_id]
                }
            new_f_meta = self.service.files().create(
                    body = meta,
                    media_body = _upload
                ).execute()
            new_f_meta = without(new_f_meta,'kind')
            new_f = drive_file(self,new_f_meta,parent)
            parent.files[end] = new_f
            return new_f

if __name__ == "__main__":
    my_api = drive_api(APPLICATION_NAME,r'..\test\drive\client_secret.json',r'..\test\drive')
    service = my_api.service