import os
import sys

import pytest
import subprocess

from osgeo import gdal
from swiftclient.service import SwiftService




def set_gdal_swift_auth():
    # parsing command line output of swift auth
    auth_keys = subprocess.check_output(["swift", "auth"]).decode(sys.stdout.encoding).split("\n")
    storage_url = auth_keys[0].split("OS_STORAGE_URL=")[1]
    auth_token = auth_keys[1].split("OS_AUTH_TOKEN=")[1]
    # setting gdal config
    gdal.SetConfigOption("SWIFT_STORAGE_URL", storage_url)
    gdal.SetConfigOption("SWIFT_AUTH_TOKEN", auth_token)


@pytest.fixture
def list_tifs(product='KS03_AIS_PSH_1G_20160101T113020_20160101T113022_KGS_019339_75CE.tar'):

    preprocessed_list = []
    container = os.getenv('PREPROCESSOR_RESULTS_BUCKET')

    with SwiftService() as swift:
        # auth_options["prefix"] = product[0]
        list_parts_gen = swift.list(
            container=container, options={"prefix": product[0]},
        )
        for page in list_parts_gen:
            if page["success"]:
                for item in page["listing"]:
                    if item["name"].endswith(".tif"):
                        preprocessed_list.append(item["name"])
    return preprocessed_list


def test_preprocessor(list_tifs):
    # check if there are preprocessed results in the buckets
    assert len(list_tifs) > 0
    container = os.getenv('PREPROCESSOR_RESULTS_BUCKET')
    for item in list_tifs:
        set_gdal_swift_auth()
        image = gdal.Open('/vsiswift/%s/%s' % (container, item), gdal.GA_ReadOnly)
        srcband = image.GetRasterBand(1)
        assert srcband.Checksum() is not None
        assert srcband.Checksum() > 0