import tkinter as tk
import util

# easy way to get data out of window events
class Window_Interaction_Handler:
    # constructor
    def __init__(self):
        self.__window_interactions = {}

    # add a result for an interaction event, saves results in reverse order by default, can optionally call another function
    def interact(self, name, result, reverse_order=True, additional_action=None, additional_action_parameters=()):
        if name in self.__window_interactions:
            if reverse_order:
                self.__window_interactions[name] = [result] + self.__window_interactions[name]
            else:
                self.__window_interactions[name] = self.__window_interactions[name] + [result]
        else:
            self.__window_interactions[name] = [result]

        if not additional_action==None:
            additional_action(*additional_action_parameters)

    # get first result for a given event from the list of results (newest (default) or oldest), removes the returned result from the list by default
    def get_result(self, name, remove=True):
        if name in self.__window_interactions and len(self.__window_interactions[name])>0:
            if remove:
                result = self.__window_interactions[name].pop(0)
                if len(self.__window_interactions[name])==0:
                    del self.__window_interactions[name]
                return result
            else:
                return self.__window_interactions[name][0]
        else:
            return None

    # get all results for a given event
    def get_results(self, name, clear=False):
        if name in self.__window_interactions and len(self.__window_interactions[name])>0:
            results = self.__window_interactions[name]
            if clear:
                del self.__window_interactions[name]
            return results

    # clear results for a given event
    def clear(self, name):
        if name in self.__window_interactions:
            del self.__window_interactions[name]

    # destructor
    def __del__(self):
        if len(self.__window_interactions)>0:
            util.warn("__window_interactions not empty upon destruction of Window_Interaction_Handler:\n"+str(self.__window_interactions))


def not_implemented():
    util.warn("Not implemented!")

# format:
#   "":{} -> menu or submenu
#   "":function -> menu entry
#   "":None -> disabled menu entry
#   None:None -> separator
#
# Entries with ... at the end are supposed to open dialogs whereas entries without dots are supposed to take effect immediately
menu_structure = {
    "IDE": {
        "Preferences...": not_implemented,
        None: None,
        "Quit": not_implemented
    },
    "Project": {
        "New": {
            "No known project types": None
        },
        "Open...": not_implemented,
        "Close": {
            "No open projects": None
        },
        None: None,
        "Preferences...": not_implemented,
        "Search...": not_implemented,
        "Build": not_implemented
    },
    "File": {
        "New...": not_implemented,
        "Open...": not_implemented,
        "Save": not_implemented,
        "Close": not_implemented,
        None: None,
        "Rename...": not_implemented,
        "Move...": not_implemented,
        "View in File Explorer...": not_implemented
    },
    "Edit": {
        "Cut": not_implemented,
        "Copy": not_implemented,
        "Paste": not_implemented,
        "Move code...": not_implemented,
        None: None,
        "Search and Replace...": not_implemented,
        None: None,
        "Format": not_implemented,
        "Indent": not_implemented,
        "Unindent": not_implemented,
        "Toggle Comment": not_implemented
    },
    "View": {
        "Zoom in": not_implemented,
        "Zoom out": not_implemented,
        "Normal Size": not_implemented
    },
    "Help": {
        "Manual...": not_implemented,
        "About IDE...": not_implemented,
    }
}

#FIXME: come up with a way to uniquely declare separators so they don't become the same element of a dict

def build_menu(structure_dict, menu):
    for entry in structure_dict:
        if structure_dict[entry]==None:
            if entry==None:
                menu.add_separator()
            else:
                menu.add_command(label=entry)
                menu.entryconfig(entry, state="disabled")
        if isinstance(structure_dict[entry], dict):
            submenu = tk.Menu(menu, tearoff=False)
            build_menu(structure_dict[entry], submenu)
            menu.add_cascade(label=entry, menu=submenu)
        if callable(structure_dict[entry]):
            menu.add_command(label=entry, command=structure_dict[entry])