from tclint.syntax_tree import Visitor, Command, BareWord, List
import lsprotocol.types as lsp


class CompletionItems:
    def __init__(self):
        self._custom_functions: list[lsp.CompletionItem] = []

    @property
    def custom_functions(self) -> list[lsp.CompletionItem]:
        return self._custom_functions

    @custom_functions.setter
    def custom_functions(self, value: lsp.CompletionItem):
        self._custom_functions.append(value)


class _Completion(Visitor):
    def __init__(self):
        super().__init__()
        self._custom_functions: list[lsp.CompletionItem] = []
        self._proc_signatures = {}

    @property
    def custom_functions(self) -> list[lsp.CompletionItem]:
        return self._custom_functions

    @property
    def proc_signatures(self):
        return self._proc_signatures

    def reset(self):
        self._custom_functions = []
        self._proc_signatures = {}

    def visit_command(self, command: Command):
        routine = command.routine

        if routine.contents == "proc" and command.args:
            first_arg = command.args[0]
            if hasattr(first_arg, "value") and not any(
                item.label == first_arg.value for item in self._custom_functions
            ):
                self._custom_functions.append(
                    lsp.CompletionItem(
                        label=first_arg.value, kind=lsp.CompletionItemKind.Function
                    )
                )
            if len(command.args) < 2:
                return

            param_list_node = command.args[1]
            if not hasattr(param_list_node, "children"):
                return

            param_names = []
            for arg in param_list_node.children:
                if isinstance(arg, BareWord):
                    param_names.append(arg.value)
                elif isinstance(arg, List) and len(arg.children) >= 1:
                    first = arg.children[0]
                    if isinstance(first, BareWord):
                        param_names.append(first.value)

            self._proc_signatures[first_arg.value] = param_names


completion = _Completion()