from __future__ import annotations

from shutil import which

from LSP.plugin import AbstractPlugin
from LSP.plugin import ClientConfig
from LSP.plugin import WorkspaceFolder
import sublime


class ScryerProlog(AbstractPlugin):
    @classmethod
    def name(cls) -> str:
        return "prolog"

    @classmethod
    def can_start(
        cls,
        window: sublime.Window,
        initiating_view: sublime.View,
        workspace_folders: list[WorkspaceFolder],
        configuration: ClientConfig,
    ) -> str | None:
        command = configuration.command[0] if configuration.command else "scryer-prolog"
        binary = sublime.expand_variables(command, {"packages": sublime.packages_path()})
        if which(binary):
            return None
        return (
            f'Could not find "{command}" on your PATH. LSP-prolog requires a build of scryer-prolog with '
            '"--lsp" support (see https://github.com/mthom/scryer-prolog). Install it, or set the "command" '
            "setting in LSP-prolog.sublime-settings to the full path of the binary."
        )