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#
# Utilities for supporting different filesystems.
import os

# FILESYSTEM_PREFIX is the path prefix that should be used in queries.  When running
# the tests against the default filesystem (fs.defaultFS), FILESYSTEM_PREFIX is the
# empty string.  When running against a secondary filesystem, it will be the scheme
# and authority portion of the qualified path.
FILESYSTEM_PREFIX = os.getenv("FILESYSTEM_PREFIX") or str()
SECONDARY_FILESYSTEM = os.getenv("SECONDARY_FILESYSTEM") or str()
FILESYSTEM = os.getenv("TARGET_FILESYSTEM")
IS_S3 = FILESYSTEM == "s3"
IS_ISILON = FILESYSTEM == "isilon"
IS_LOCAL = FILESYSTEM == "local"
IS_HDFS = FILESYSTEM == "hdfs"
IS_ADLS = FILESYSTEM == "adls"
IS_ABFS = FILESYSTEM == "abfs"
IS_EC = os.getenv("ERASURE_CODING") == "true"
# This condition satisfies both the states where one can assume a default fs
#   - The environment variable is set to an empty string.
#   - Tne environment variables is unset ( None )
# When the local filesystem is used, it should always be the default filesystem.
IS_DEFAULT_FS = not FILESYSTEM_PREFIX or IS_LOCAL

# Isilon specific values.
ISILON_NAMENODE = os.getenv("ISILON_NAMENODE") or str()
ISILON_WEBHDFS_PORT = 8082

# S3 specific values
S3_BUCKET_NAME = os.getenv("S3_BUCKET")
S3GUARD_ENABLED = os.getenv("S3GUARD_ENABLED") == "true"

# ADLS / ABFS specific values
ABFS_ACCOUNT_NAME = os.getenv("azure_storage_account_name")
ABFS_CONTAINER_NAME = os.getenv("azure_storage_container_name")
ADLS_STORE_NAME = os.getenv("azure_data_lake_store_name")
ADLS_CLIENT_ID = os.getenv("azure_client_id")
ADLS_TENANT_ID = os.getenv("azure_tenant_id")
ADLS_CLIENT_SECRET = os.getenv("azure_client_secret")

# A map of FILESYSTEM values to their corresponding Scan Node types
fs_to_name = {'s3': 'S3', 'hdfs': 'HDFS', 'local': 'LOCAL', 'adls': 'ADLS',
              'abfs': 'ADLS'}


def get_fs_name(fs):
 """Given the target filesystem, return the name of the associated storage layer"""
 return fs_to_name[fs]


def prepend_with_fs(fs, path):
  """Prepend 'path' with 'fs' if it's not already the prefix."""
  return path if path.startswith(fs) else "%s%s" % (fs, path)


def get_fs_path(path):
  return prepend_with_fs(FILESYSTEM_PREFIX, path)


def get_secondary_fs_path(path):
  return prepend_with_fs(SECONDARY_FILESYSTEM, path)


WAREHOUSE = get_fs_path('/test-warehouse')
FILESYSTEM_NAME = get_fs_name(FILESYSTEM)