from os import getenv
from django.core.exceptions import ImproperlyConfigured

DBBACKUP_CONNECTORS = {
    "default": {
        "SINGLE_TRANSACTION": False,
        "IF_EXISTS": True,
        "RESTORE_SUFFIX": "--set ON_ERROR_STOP=off",
    }
}

if getenv("DBBACKUP_HOST") and getenv("DBBACKUP_USER") and getenv("DBBACKUP_PASS"):
    dbbackup_server_type = getenv("DBBACKUP_TYPE", "sftp")
    project_name = getenv("EVIBES_PROJECT_NAME", "evibes_common").lower().replace(" ", "_")

    raw_path = getenv("DBBACKUP_PATH", f"backups/{project_name}")
    cleaned = raw_path.strip("/")
    remote_dir = f"{cleaned}/"

    match dbbackup_server_type:
        case "sftp":
            DBBACKUP_STORAGE = "storages.backends.sftpstorage.SFTPStorage"
            DBBACKUP_STORAGE_OPTIONS = {
                "host": getenv("DBBACKUP_HOST"),
                "root_path": f"/{remote_dir}",
                "params": {
                    "username": getenv("DBBACKUP_USER"),
                    "password": getenv("DBBACKUP_PASS"),
                    "allow_agent": False,
                    "look_for_keys": False,
                },
                "interactive": False,
                "file_mode": 0o600,
                "dir_mode": 0o700,
            }

        case "ftp":
            DBBACKUP_STORAGE = "storages.backends.ftp.FTPStorage"
            DBBACKUP_STORAGE_OPTIONS = {
                "location": (
                    f"ftp://{getenv('DBBACKUP_USER')}:"
                    f"{getenv('DBBACKUP_PASS')}@"
                    f"{getenv('DBBACKUP_HOST')}:21/"
                    f"{remote_dir}"
                ),
            }

        case _:
            raise ImproperlyConfigured(f"Invalid DBBACKUP_TYPE: {dbbackup_server_type}")

else:
    DBBACKUP_STORAGE = "django.core.files.storage.FileSystemStorage"
    DBBACKUP_STORAGE_OPTIONS = {
        "location": "/app/backups/",
    }