"""
core node services
"""
import tkinter as tk
from tkinter import messagebox, ttk
from typing import TYPE_CHECKING, Any, Set

from core.gui.dialogs.dialog import Dialog
from core.gui.dialogs.serviceconfig import ServiceConfigDialog
from core.gui.nodeutils import NodeUtils
from core.gui.themes import FRAME_PAD, PADX, PADY
from core.gui.widgets import CheckboxList, ListboxScroll

if TYPE_CHECKING:
    from core.gui.app import Application
    from core.gui.graph.node import CanvasNode


class NodeServiceDialog(Dialog):
    def __init__(
        self,
        master: Any,
        app: "Application",
        canvas_node: "CanvasNode",
        services: Set[str] = None,
    ):
        title = f"{canvas_node.core_node.name} Services"
        super().__init__(master, app, title, modal=True)
        self.app = app
        self.canvas_node = canvas_node
        self.node_id = canvas_node.core_node.id
        self.groups = None
        self.services = None
        self.current = None
        if services is None:
            services = canvas_node.core_node.services
            model = canvas_node.core_node.model
            if len(services) == 0:
                # not custom node type and node's services haven't been modified before
                if not NodeUtils.is_custom(
                    canvas_node.core_node.type, canvas_node.core_node.model
                ) and not self.app.core.service_been_modified(self.node_id):
                    services = set(self.app.core.default_services[model])
                # services of default type nodes were modified to be empty
                elif canvas_node.core_node.id in self.app.core.modified_service_nodes:
                    services = set()
                else:
                    services = set(
                        NodeUtils.get_custom_node_services(self.app.guiconfig, model)
                    )
            else:
                services = set(services)
        self.current_services = services
        self.draw()

    def draw(self):
        self.top.columnconfigure(0, weight=1)
        self.top.rowconfigure(0, weight=1)

        frame = ttk.Frame(self.top)
        frame.grid(stick="nsew", pady=PADY)
        frame.rowconfigure(0, weight=1)
        for i in range(3):
            frame.columnconfigure(i, weight=1)
        label_frame = ttk.LabelFrame(frame, text="Groups", padding=FRAME_PAD)
        label_frame.grid(row=0, column=0, sticky="nsew")
        label_frame.rowconfigure(0, weight=1)
        label_frame.columnconfigure(0, weight=1)
        self.groups = ListboxScroll(label_frame)
        self.groups.grid(sticky="nsew")
        for group in sorted(self.app.core.services):
            self.groups.listbox.insert(tk.END, group)
        self.groups.listbox.bind("<<ListboxSelect>>", self.handle_group_change)
        self.groups.listbox.selection_set(0)

        label_frame = ttk.LabelFrame(frame, text="Services")
        label_frame.grid(row=0, column=1, sticky="nsew")
        label_frame.columnconfigure(0, weight=1)
        label_frame.rowconfigure(0, weight=1)
        self.services = CheckboxList(
            label_frame, self.app, clicked=self.service_clicked, padding=FRAME_PAD
        )
        self.services.grid(sticky="nsew")

        label_frame = ttk.LabelFrame(frame, text="Selected", padding=FRAME_PAD)
        label_frame.grid(row=0, column=2, sticky="nsew")
        label_frame.rowconfigure(0, weight=1)
        label_frame.columnconfigure(0, weight=1)
        self.current = ListboxScroll(label_frame)
        self.current.grid(sticky="nsew")
        for service in sorted(self.current_services):
            self.current.listbox.insert(tk.END, service)
            if self.is_custom_service(service):
                self.current.listbox.itemconfig(tk.END, bg="green")

        frame = ttk.Frame(self.top)
        frame.grid(stick="ew")
        for i in range(4):
            frame.columnconfigure(i, weight=1)
        button = ttk.Button(frame, text="Configure", command=self.click_configure)
        button.grid(row=0, column=0, sticky="ew", padx=PADX)
        button = ttk.Button(frame, text="Save", command=self.click_save)
        button.grid(row=0, column=1, sticky="ew", padx=PADX)
        button = ttk.Button(frame, text="Remove", command=self.click_remove)
        button.grid(row=0, column=2, sticky="ew", padx=PADX)
        button = ttk.Button(frame, text="Cancel", command=self.click_cancel)
        button.grid(row=0, column=3, sticky="ew")

        # trigger group change
        self.groups.listbox.event_generate("<<ListboxSelect>>")

    def handle_group_change(self, event: tk.Event = None):
        selection = self.groups.listbox.curselection()
        if selection:
            index = selection[0]
            group = self.groups.listbox.get(index)
            self.services.clear()
            for name in sorted(self.app.core.services[group]):
                checked = name in self.current_services
                self.services.add(name, checked)

    def service_clicked(self, name: str, var: tk.IntVar):
        if var.get() and name not in self.current_services:
            self.current_services.add(name)
        elif not var.get() and name in self.current_services:
            self.current_services.remove(name)
        self.current.listbox.delete(0, tk.END)
        for name in sorted(self.current_services):
            self.current.listbox.insert(tk.END, name)
            if self.is_custom_service(name):
                self.current.listbox.itemconfig(tk.END, bg="green")
        self.canvas_node.core_node.services[:] = self.current_services

    def click_configure(self):
        current_selection = self.current.listbox.curselection()
        if len(current_selection):
            dialog = ServiceConfigDialog(
                self,
                self.app,
                self.current.listbox.get(current_selection[0]),
                self.canvas_node,
                self.node_id,
            )

            # if error occurred when creating ServiceConfigDialog, don't show the dialog
            if not dialog.has_error:
                dialog.show()
            else:
                dialog.destroy()
        else:
            messagebox.showinfo(
                "Service Configuration", "Select a service to configure", parent=self
            )

    def click_save(self):
        # if node is custom type or current services are not the default services then
        # set core node services and add node to modified services node set
        if (
            self.canvas_node.core_node.model not in self.app.core.default_services
            or self.current_services
            != self.app.core.default_services[self.canvas_node.core_node.model]
        ):
            self.canvas_node.core_node.services[:] = self.current_services
            self.app.core.modified_service_nodes.add(self.canvas_node.core_node.id)
        else:
            if len(self.canvas_node.core_node.services) > 0:
                self.canvas_node.core_node.services[:] = []
        self.destroy()

    def click_cancel(self):
        self.current_services = None
        self.destroy()

    def click_remove(self):
        cur = self.current.listbox.curselection()
        if cur:
            service = self.current.listbox.get(cur[0])
            self.current.listbox.delete(cur[0])
            self.current_services.remove(service)
            for checkbutton in self.services.frame.winfo_children():
                if checkbutton["text"] == service:
                    checkbutton.invoke()
                    return

    def is_custom_service(self, service: str) -> bool:
        has_service_config = service in self.canvas_node.service_configs
        has_file_config = service in self.canvas_node.service_file_configs
        return has_service_config or has_file_config
