import tkinter as tk
from tkinter import ttk
from typing import TYPE_CHECKING, Any

from core.api.grpc import core_pb2
from core.gui.dialogs.dialog import Dialog
from core.gui.themes import PADX, PADY
from core.gui.widgets import CodeText, ListboxScroll

if TYPE_CHECKING:
    from core.gui.app import Application


class HookDialog(Dialog):
    def __init__(self, master: Any, app: "Application"):
        super().__init__(master, app, "Hook", modal=True)
        self.name = tk.StringVar()
        self.codetext = None
        self.hook = core_pb2.Hook()
        self.state = tk.StringVar()
        self.draw()

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

        # name and states
        frame = ttk.Frame(self.top)
        frame.grid(sticky="ew", pady=PADY)
        frame.columnconfigure(0, weight=2)
        frame.columnconfigure(1, weight=7)
        frame.columnconfigure(2, weight=1)
        label = ttk.Label(frame, text="Name")
        label.grid(row=0, column=0, sticky="ew", padx=PADX)
        entry = ttk.Entry(frame, textvariable=self.name)
        entry.grid(row=0, column=1, sticky="ew", padx=PADX)
        values = tuple(x for x in core_pb2.SessionState.Enum.keys() if x != "NONE")
        initial_state = core_pb2.SessionState.Enum.Name(core_pb2.SessionState.RUNTIME)
        self.state.set(initial_state)
        self.name.set(f"{initial_state.lower()}_hook.sh")
        combobox = ttk.Combobox(
            frame, textvariable=self.state, values=values, state="readonly"
        )
        combobox.grid(row=0, column=2, sticky="ew")
        combobox.bind("<<ComboboxSelected>>", self.state_change)

        # data
        self.codetext = CodeText(self.top)
        self.codetext.text.insert(
            1.0,
            (
                "#!/bin/sh\n"
                "# session hook script; write commands here to execute on the host at the\n"
                "# specified state\n"
            ),
        )
        self.codetext.grid(sticky="nsew", pady=PADY)

        # button row
        frame = ttk.Frame(self.top)
        frame.grid(sticky="ew")
        for i in range(2):
            frame.columnconfigure(i, weight=1)
        button = ttk.Button(frame, text="Save", command=lambda: self.save())
        button.grid(row=0, column=0, sticky="ew", padx=PADX)
        button = ttk.Button(frame, text="Cancel", command=lambda: self.destroy())
        button.grid(row=0, column=1, sticky="ew")

    def state_change(self, event: tk.Event):
        state_name = self.state.get()
        self.name.set(f"{state_name.lower()}_hook.sh")

    def set(self, hook: core_pb2.Hook):
        self.hook = hook
        self.name.set(hook.file)
        self.codetext.text.delete(1.0, tk.END)
        self.codetext.text.insert(tk.END, hook.data)
        state_name = core_pb2.SessionState.Enum.Name(hook.state)
        self.state.set(state_name)

    def save(self):
        data = self.codetext.text.get("1.0", tk.END).strip()
        state_value = core_pb2.SessionState.Enum.Value(self.state.get())
        self.hook.file = self.name.get()
        self.hook.data = data
        self.hook.state = state_value
        self.destroy()


class HooksDialog(Dialog):
    def __init__(self, master: "Application", app: "Application"):
        super().__init__(master, app, "Hooks", modal=True)
        self.listbox = None
        self.edit_button = None
        self.delete_button = None
        self.selected = None
        self.draw()

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

        listbox_scroll = ListboxScroll(self.top)
        listbox_scroll.grid(sticky="nsew", pady=PADY)
        self.listbox = listbox_scroll.listbox
        self.listbox.bind("<<ListboxSelect>>", self.select)
        for hook_file in self.app.core.hooks:
            self.listbox.insert(tk.END, hook_file)

        frame = ttk.Frame(self.top)
        frame.grid(sticky="ew")
        for i in range(4):
            frame.columnconfigure(i, weight=1)
        button = ttk.Button(frame, text="Create", command=self.click_create)
        button.grid(row=0, column=0, sticky="ew", padx=PADX)
        self.edit_button = ttk.Button(
            frame, text="Edit", state=tk.DISABLED, command=self.click_edit
        )
        self.edit_button.grid(row=0, column=1, sticky="ew", padx=PADX)
        self.delete_button = ttk.Button(
            frame, text="Delete", state=tk.DISABLED, command=self.click_delete
        )
        self.delete_button.grid(row=0, column=2, sticky="ew", padx=PADX)
        button = ttk.Button(frame, text="Cancel", command=lambda: self.destroy())
        button.grid(row=0, column=3, sticky="ew")

    def click_create(self):
        dialog = HookDialog(self, self.app)
        dialog.show()
        hook = dialog.hook
        if hook:
            self.app.core.hooks[hook.file] = hook
            self.listbox.insert(tk.END, hook.file)

    def click_edit(self):
        hook = self.app.core.hooks[self.selected]
        dialog = HookDialog(self, self.app)
        dialog.set(hook)
        dialog.show()

    def click_delete(self):
        del self.app.core.hooks[self.selected]
        self.listbox.delete(tk.ANCHOR)
        self.edit_button.config(state=tk.DISABLED)
        self.delete_button.config(state=tk.DISABLED)

    def select(self, event: tk.Event):
        if self.listbox.curselection():
            index = self.listbox.curselection()[0]
            self.selected = self.listbox.get(index)
            self.edit_button.config(state=tk.NORMAL)
            self.delete_button.config(state=tk.NORMAL)
        else:
            self.selected = None
            self.edit_button.config(state=tk.DISABLED)
            self.delete_button.config(state=tk.DISABLED)
