import os
import sys
from pathlib import Path

from elastic.pipes.core import Pipe
from typing_extensions import Annotated


class Context(Pipe.Context):
    notes = "Either [b]token[/b] or [b]token-file[/b] may be specified, not both."

    url: Annotated[
        str,
        Pipe.Config("url"),
        Pipe.Help("URL of the Vault instance"),
        Pipe.Notes("default: from environment VAULT_ADDR"),
    ] = None
    token: Annotated[
        str,
        Pipe.Config("token"),
        Pipe.Help("Vault API authentication token"),
        Pipe.Notes("default: from environment VAULT_TOKEN"),
    ] = None
    token_file: Annotated[
        str,
        Pipe.Config("token-file"),
        Pipe.Help("file containing the Vault API authentication token"),
    ] = None

    def __init__(self):
        if not self.url:
            if url := os.environ.get("VAULT_ADDR", None):
                self.logger.debug("    read URL from environment 'VAULT_ADDR'")
                self.url = url
        if self.token and self.token_file:
            self.logger.error("both 'token' and 'token-file' are specified")
            sys.exit(1)
        elif self.token_file:
            token_file = Path(self.token_file).expanduser()
            if token := token_file.read_text():
                self.logger.debug(f"    read token from file '{token_file}'")
                self.token = token
        elif not self.token:
            if token := os.environ.get("VAULT_TOKEN", None):
                self.logger.debug("    read token from environment 'VAULT_TOKEN'")
                self.token = token

        if not self.url:
            self.logger.error("Vault URL is not defined")
            sys.exit(1)
        if not self.token:
            self.logger.error("Vault token is not defined")
            sys.exit(1)