"""Plugin system for tmuxp."""

from __future__ import annotations

import logging
import typing as t

import libtmux
from libtmux._compat import LegacyVersion as Version
from libtmux.common import get_version

from .__about__ import __version__
from .exc import TmuxpPluginException

logger = logging.getLogger(__name__)

#: Minimum version of tmux required to run tmuxp
TMUX_MIN_VERSION = "3.2"

#: Most recent version of tmux supported
TMUX_MAX_VERSION = None

#: Minimum version of libtmux required to run libtmux
LIBTMUX_MIN_VERSION = "0.8.3"

#: Most recent version of libtmux supported
LIBTMUX_MAX_VERSION = None

#: Minimum version of tmuxp required to use plugins
TMUXP_MIN_VERSION = "1.6.0"

#: Most recent version of tmuxp
TMUXP_MAX_VERSION = None


if t.TYPE_CHECKING:
    from typing import TypeGuard

    from libtmux.session import Session
    from libtmux.window import Window
    from typing_extensions import TypedDict, Unpack

    from ._internal.types import PluginConfigSchema

    class VersionConstraints(TypedDict):
        """Version constraints mapping for a tmuxp plugin."""

        version: Version | str
        vmin: str
        vmax: str | None
        incompatible: list[t.Any | str]

    class TmuxpPluginVersionConstraints(TypedDict):
        """Version constraints for a tmuxp plugin."""

        tmux: VersionConstraints
        tmuxp: VersionConstraints
        libtmux: VersionConstraints


class Config(t.TypedDict):
    """tmuxp plugin configuration mapping."""

    plugin_name: str
    tmux_min_version: str
    tmux_max_version: str | None
    tmux_version_incompatible: list[str] | None
    libtmux_min_version: str
    libtmux_max_version: str | None
    libtmux_version_incompatible: list[str] | None
    tmuxp_min_version: str
    tmuxp_max_version: str | None
    tmuxp_version_incompatible: list[str] | None


DEFAULT_CONFIG: Config = {
    "plugin_name": "tmuxp-plugin",
    "tmux_min_version": TMUX_MIN_VERSION,
    "tmux_max_version": TMUX_MAX_VERSION,
    "tmux_version_incompatible": None,
    "libtmux_min_version": LIBTMUX_MIN_VERSION,
    "libtmux_max_version": LIBTMUX_MAX_VERSION,
    "libtmux_version_incompatible": None,
    "tmuxp_min_version": TMUXP_MIN_VERSION,
    "tmuxp_max_version": TMUXP_MAX_VERSION,
    "tmuxp_version_incompatible": None,
}


def validate_plugin_config(config: PluginConfigSchema) -> TypeGuard[Config]:
    """Return True if tmuxp plugin configuration valid, also upcasts."""
    return isinstance(config, dict)


def setup_plugin_config(
    config: PluginConfigSchema,
    default_config: Config = DEFAULT_CONFIG,
) -> Config:
    """Initialize tmuxp plugin configuration."""
    new_config = config.copy()
    for default_key, default_value in default_config.items():
        if default_key not in new_config:
            new_config[default_key] = default_value  # type:ignore

    assert validate_plugin_config(new_config)

    return new_config


class TmuxpPlugin:
    """Base class for a tmuxp plugin."""

    def __init__(self, **kwargs: Unpack[PluginConfigSchema]) -> None:
        """
        Initialize plugin.

        The default version values are set to the versions that the plugin
        system requires.

        Parameters
        ----------
        plugin_name : str
            Name of the child plugin. Used in error message plugin fails to
            load

        tmux_min_version : str
            Min version of tmux that the plugin supports

        tmux_max_version : str
            Min version of tmux that the plugin supports

        tmux_version_incompatible : list
            Versions of tmux that are incompatible with the plugin

        libtmux_min_version : str
            Min version of libtmux that the plugin supports

        libtmux_max_version : str
            Max version of libtmux that the plugin supports

        libtmux_version_incompatible : list
            Versions of libtmux that are incompatible with the plugin

        tmuxp_min_version : str
            Min version of tmuxp that the plugin supports

        tmuxp_max_version : str
            Max version of tmuxp that the plugin supports

        tmuxp_version_incompatible : list
            Versions of tmuxp that are incompatible with the plugin

        """
        config = setup_plugin_config(config=kwargs)
        self.plugin_name = config["plugin_name"]

        # Dependency versions
        self.tmux_version = get_version()
        self.libtmux_version = libtmux.__about__.__version__
        self.tmuxp_version = Version(__version__)

        self.version_constraints: TmuxpPluginVersionConstraints = {
            "tmux": {
                "version": self.tmux_version,
                "vmin": config["tmux_min_version"],
                "vmax": config["tmux_max_version"],
                "incompatible": config["tmux_version_incompatible"] or [],
            },
            "libtmux": {
                "version": self.libtmux_version,
                "vmin": config["libtmux_min_version"],
                "vmax": config["libtmux_max_version"],
                "incompatible": config["libtmux_version_incompatible"] or [],
            },
            "tmuxp": {
                "version": self.tmuxp_version,
                "vmin": config["tmuxp_min_version"],
                "vmax": config["tmuxp_max_version"],
                "incompatible": config["tmuxp_version_incompatible"] or [],
            },
        }

        self._version_check()

    def _version_check(self) -> None:
        """Check all dependency versions for compatibility."""
        logger.debug("checking version constraints for %s", self.plugin_name)
        for dep, constraints in self.version_constraints.items():
            assert isinstance(constraints, dict)
            try:
                assert self._pass_version_check(**constraints)
            except AssertionError as e:
                msg = (
                    "Incompatible {dep} version: {version}\n{plugin_name} "
                    "requirements:\nmin: {vmin} | max: {vmax} | "
                    "incompatible: {incompatible}\n".format(
                        dep=dep,
                        plugin_name=self.plugin_name,
                        **constraints,
                    )
                )
                raise TmuxpPluginException(
                    msg,
                ) from e

    def _pass_version_check(
        self,
        version: str | Version,
        vmin: str,
        vmax: str | None,
        incompatible: list[t.Any | str],
    ) -> bool:
        """Provide affirmative if version compatibility is correct."""
        if vmin and version < Version(vmin):
            return False
        if vmax and version > Version(vmax):
            return False
        return version not in incompatible

    def before_workspace_builder(self, session: Session) -> None:
        """
        Provide a session hook previous to creating the workspace.

        This runs after the session has been created but before any of
        the windows/panes/commands are entered.

        Parameters
        ----------
        session : :class:`libtmux.Session`
            session to hook into
        """

    def on_window_create(self, window: Window) -> None:
        """
        Provide a window hook previous to doing anything with a window.

        This runs runs before anything is created in the windows, like panes.

        Parameters
        ----------
        window: :class:`libtmux.Window`
            window to hook into
        """

    def after_window_finished(self, window: Window) -> None:
        """
        Provide a window hook after creating the window.

        This runs after everything has been created in the window, including
        the panes and all of the commands for the panes. It also runs after the
        ``options_after`` has been applied to the window.

        Parameters
        ----------
        window: :class:`libtmux.Window`
            window to hook into
        """

    def before_script(self, session: Session) -> None:
        """
        Provide a session hook after the workspace has been built.

        This runs after the workspace has been loaded with ``tmuxp load``. It
        augments instead of replaces the ``before_script`` section of the
        workspace data.

        This hook provides access to the LibTmux.session object for any
        behavior that would be used in the ``before_script`` section of the
        workspace file that needs access directly to the session object.
        This runs after the workspace has been loaded with ``tmuxp load``.

        The hook augments, rather than replaces, the ``before_script`` section
        of the workspace. While it is possible to do all of the
        ``before_script`` workspace in this function, if a shell script
        is currently being used for the workspace, it would be cleaner to
        continue using the script in the ``before_section``.

        If changes to the session need to be made prior to
        anything being built, please use ``before_workspace_builder`` instead.

        Parameters
        ----------
        session : :class:`libtmux.Session`
            session to hook into
        """

    def reattach(self, session: Session) -> None:
        """
        Provide a session hook before reattaching to the session.

        Parameters
        ----------
        session : :class:`libtmux.Session`
            session to hook into
        """
