from datetime import datetime,timedelta
from adm.constants import CTS as cts
from django.core.files.uploadedfile import InMemoryUploadedFile
from django.core.files.base import ContentFile
from storages.backends.gcloud import GoogleCloudStorage
from google.oauth2 import service_account
import os
import json


class MediaStorage():
    def __init__(self, container=None):
        self.storage = None
        self.container = container
        if cts.STORAGE_TYPE == "GCP":
            if self.container is None:
                self.container = cts.GCP_ST_INFODRIVERS
            self.storage = GoogleCloudStorage()
            baseDir = os.path.dirname(os.path.realpath(__file__))
            if cts.AMBIENTE_EC2=="PROD":
                pathCredentials = baseDir + "/auth/credentials_gcp_storage.json"
            else:
                pathCredentials = baseDir + "/auth/credentials_gcp_stg_storage.json"
            with open(pathCredentials) as credentials:
                self.credentials = json.load(credentials)
            self.storage.credentials = service_account.Credentials.from_service_account_file(pathCredentials)
            self.storage.project_id = cts.GCP_ST_ACCESS_ID
            self.storage.bucket_name = cts.GCP_ST_ACCESS_KEY_ID
            self.location = self.container + "\\"

    def exists(self, path_midia_bucket):
        return self.storage.exists(path_midia_bucket)

    def delete(self, path_midia_bucket):
        self.storage.delete(path_midia_bucket)

    def url(self, path_midia_bucket,expire=None):
        ret = ""
        if expire is None:
            expire = 600
        elif expire==-1:
            expire = None
        if cts.STORAGE_TYPE == "GCP":
            if expire is None:
                self.storage.expiration = None
            else:
                self.storage.expiration = datetime.utcnow() + timedelta(seconds=expire)
            ret = self.storage.url(path_midia_bucket)
        else:
            ret = self.storage.url(path_midia_bucket,expire)
        return ret

    def save(self, path_midia_bucket, content,max_length=None):
        if cts.STORAGE_TYPE == "GCP":
            if isinstance(content,InMemoryUploadedFile):
                path_midia_bucket = path_midia_bucket.replace("/","\\")
                arrTMP = path_midia_bucket.split("\\")
                path_midia_bucket = path_midia_bucket.replace(arrTMP[0]+"\\",cts.GCP_ST_GENERAL + "\\")
                if self.exists(path_midia_bucket):
                    self.delete(path_midia_bucket)
                self.storage.save(path_midia_bucket, content.file)
            else:
                try:
                    self.storage.save(path_midia_bucket, content)
                except:
                    self.storage.save(path_midia_bucket, ContentFile(content))
    
    def generate_filename(self,filename):
        return filename