# © Crown-owned copyright 2023, Defence Science and Technology Laboratory UK
"""Provides a CLI using Typer as an entry point."""
import logging
import os
from enum import Enum
from typing import Optional

import typer
import yaml
from typing_extensions import Annotated

from primaite import PRIMAITE_PATHS
from primaite.data_viz import PlotlyTemplate

app = typer.Typer()


@app.command()
def build_dirs() -> None:
    """Build the PrimAITE app directories."""
    from primaite.setup import setup_app_dirs

    setup_app_dirs.run()


@app.command()
def reset_notebooks(overwrite: bool = True) -> None:
    """
    Force a reset of the demo notebooks in the users notebooks directory.

    :param overwrite: If True, will overwrite existing demo notebooks.
    """
    from primaite.setup import reset_demo_notebooks

    reset_demo_notebooks.run(overwrite)


@app.command()
def logs(last_n: Annotated[int, typer.Option("-n")]) -> None:
    """
    Print the PrimAITE log file.

    :param last_n: The number of lines to print. Default value is 10.
    """
    import re

    from primaite import PRIMAITE_PATHS

    if os.path.isfile(PRIMAITE_PATHS.app_log_file_path):
        with open(PRIMAITE_PATHS.app_log_file_path) as file:
            lines = file.readlines()
        for line in lines[-last_n:]:
            print(re.sub(r"\n*", "", line))


_LogLevel = Enum("LogLevel", {k: k for k in logging._levelToName.values()})  # noqa


@app.command()
def log_level(level: Annotated[Optional[_LogLevel], typer.Argument()] = None) -> None:
    """
    View or set the PrimAITE Log Level.

    To View, simply call: primaite log-level

    To set, call: primaite log-level <desired log level>

    For example, to set the to debug, call: primaite log-level DEBUG
    """
    if PRIMAITE_PATHS.app_config_file_path.exists():
        with open(PRIMAITE_PATHS.app_config_file_path, "r") as file:
            primaite_config = yaml.safe_load(file)

        if level:
            primaite_config["logging"]["log_level"] = level.value
            with open(PRIMAITE_PATHS.app_config_file_path, "w") as file:
                yaml.dump(primaite_config, file)
            print(f"PrimAITE Log Level: {level}")
        else:
            level = primaite_config["logging"]["log_level"]
            print(f"PrimAITE Log Level: {level}")


@app.command()
def notebooks() -> None:
    """Start Jupyter Lab in the users PrimAITE notebooks directory."""
    from primaite.notebooks import start_jupyter_session

    start_jupyter_session()


@app.command()
def version() -> None:
    """Get the installed PrimAITE version number."""
    import primaite

    print(primaite.__version__)


@app.command()
def clean_up() -> None:
    """Cleans up left over files from previous version installations."""
    from primaite.setup import old_installation_clean_up

    old_installation_clean_up.run()


@app.command()
def setup(overwrite_existing: bool = True) -> None:
    """
    Perform the PrimAITE first-time setup.

    WARNING: All user-data will be lost.
    """
    from primaite import getLogger
    from primaite.setup import old_installation_clean_up, reset_demo_notebooks, reset_example_configs

    _LOGGER = getLogger(__name__)

    _LOGGER.info("Performing the PrimAITE first-time setup...")

    _LOGGER.info("Building primaite_config.yaml...")

    _LOGGER.info("Building the PrimAITE app directories...")
    PRIMAITE_PATHS.mkdirs()

    _LOGGER.info("Rebuilding the demo notebooks...")
    reset_demo_notebooks.run(overwrite_existing=True)

    _LOGGER.info("Rebuilding the example notebooks...")
    reset_example_configs.run(overwrite_existing=True)

    _LOGGER.info("Performing a clean-up of previous PrimAITE installations...")
    old_installation_clean_up.run()

    _LOGGER.info("PrimAITE setup complete!")


@app.command()
def session(tc: Optional[str] = None, ldc: Optional[str] = None, load: Optional[str] = None) -> None:
    """
    Run a PrimAITE session.

    tc: The training config filepath. Optional. If no value is passed then
    example default training config is used from:
    ~/primaite/2.0.0rc2/config/example_config/training/training_config_main.yaml.

    ldc: The lay down config file path. Optional. If no value is passed then
    example default lay down config is used from:
    ~/primaite/2.0.0rc2/config/example_config/lay_down/lay_down_config_3_doc_very_basic.yaml.

    load: The directory of a previous session. Optional. If no value is passed, then the session
    will use the default training config and laydown config. Inversely, if a training config and laydown config
    is passed while a session directory is passed, PrimAITE will load the session and ignore the training config
    and laydown config.
    """
    from primaite.config.lay_down_config import dos_very_basic_config_path
    from primaite.config.training_config import main_training_config_path
    from primaite.main import run

    if load is not None:
        # run a loaded session
        run(session_path=load)

    else:
        # start a new session using tc and ldc
        if not tc:
            tc = main_training_config_path()

        if not ldc:
            ldc = dos_very_basic_config_path()

        run(training_config_path=tc, lay_down_config_path=ldc)


@app.command()
def plotly_template(template: Annotated[Optional[PlotlyTemplate], typer.Argument()] = None) -> None:
    """
    View or set the plotly template for Session plots.

    To View, simply call: primaite plotly-template

    To set, call: primaite plotly-template <desired template>

    For example, to set as plotly_dark, call: primaite plotly-template PLOTLY_DARK
    """
    if PRIMAITE_PATHS.app_config_file_path.exists():
        with open(PRIMAITE_PATHS.app_config_file_path, "r") as file:
            primaite_config = yaml.safe_load(file)

        if template:
            primaite_config["session"]["outputs"]["plots"]["template"] = template.value
            with open(PRIMAITE_PATHS.app_config_file_path, "w") as file:
                yaml.dump(primaite_config, file)
            print(f"PrimAITE plotly template: {template.value}")
        else:
            template = primaite_config["session"]["outputs"]["plots"]["template"]
            print(f"PrimAITE plotly template: {template}")