import sys

from absl import logging

from keras_core.api_export import keras_core_export
from keras_core.backend.common import global_state


@keras_core_export(
    [
        "keras_core.config.enable_interactive_logging",
        "keras_core.utils.enable_interactive_logging",
    ]
)
def enable_interactive_logging():
    """Turn on interactive logging.

    When interactive logging is enabled, Keras displays logs via stdout.
    This provides the best experience when using Keras in an interactive
    environment such as a shell or a notebook.
    """
    global_state.set_global_setting("interactive_logging", True)


@keras_core_export(
    [
        "keras_core.config.disable_interactive_logging",
        "keras_core.utils.disable_interactive_logging",
    ]
)
def disable_interactive_logging():
    """Turn off interactive logging.

    When interactive logging is disabled, Keras sends logs to `absl.logging`.
    This is the best option when using Keras in a non-interactive
    way, such as running a training or inference job on a server.
    """
    global_state.set_global_setting("interactive_logging", False)


@keras_core_export(
    [
        "keras_core.config.is_interactive_logging_enabled",
        "keras_core.utils.is_interactive_logging_enabled",
    ]
)
def is_interactive_logging_enabled():
    """Check if interactive logging is enabled.

    To switch between writing logs to stdout and `absl.logging`, you may use
    `keras.config.enable_interactive_logging()` and
    `keras.config.disable_interactie_logging()`.

    Returns:
        Boolean, `True` if interactive logging is enabled,
        and `False` otherwise.
    """
    return global_state.get_global_setting("interactive_logging", True)


def print_msg(message, line_break=True):
    """Print the message to absl logging or stdout."""
    if is_interactive_logging_enabled():
        if line_break:
            sys.stdout.write(message + "\n")
        else:
            sys.stdout.write(message)
        sys.stdout.flush()
    else:
        logging.info(message)


def ask_to_proceed_with_overwrite(filepath):
    """Produces a prompt asking about overwriting a file.

    Args:
        filepath: the path to the file to be overwritten.

    Returns:
        True if we can proceed with overwrite, False otherwise.
    """
    overwrite = (
        input(f"[WARNING] {filepath} already exists - overwrite? [y/n]")
        .strip()
        .lower()
    )
    while overwrite not in ("y", "n"):
        overwrite = (
            input('Enter "y" (overwrite) or "n" (cancel).').strip().lower()
        )
    if overwrite == "n":
        return False
    print_msg("[TIP] Next time specify overwrite=True!")
    return True