import tkinter as tk
from tkinter import ttk
from typing import Optional


class StatusBar(ttk.Frame):
    """Status bar widget containing connection indicators and rate/status text.

    Exposes small API so MainView can delegate status updates without managing
    layout details.
    """

    def __init__(self, parent):
        super().__init__(parent, relief=tk.SUNKEN)

        ttk.Label(self, text="Target:").pack(side=tk.LEFT, padx=(5, 2))
        self.target_status_canvas = tk.Canvas(self, width=16, height=16, highlightthickness=0)
        self.target_status_canvas.pack(side=tk.LEFT, padx=(0, 10))
        self._draw_status_indicator(self.target_status_canvas, "#e74c3c")

        ttk.Label(self, text="LRU:").pack(side=tk.LEFT, padx=(5, 2))
        self.lru_status_canvas = tk.Canvas(self, width=16, height=16, highlightthickness=0)
        self.lru_status_canvas.pack(side=tk.LEFT, padx=(0, 10))
        self._draw_status_indicator(self.lru_status_canvas, "#e74c3c")

        self.status_var = tk.StringVar(value="Ready")
        ttk.Label(self, textvariable=self.status_var, anchor=tk.W).pack(side=tk.LEFT, fill=tk.X, expand=True, padx=5)

        # Small rate indicator showing incoming real-state rate and PPI update rate
        try:
            self.rate_status_var = tk.StringVar(value="")
            ttk.Label(self, textvariable=self.rate_status_var, anchor=tk.E).pack(side=tk.RIGHT, padx=(4, 8))
        except Exception:
            self.rate_status_var = None

        # Id for scheduled status clear; used by show_status_message
        self._status_after_id: Optional[str] = None

    def _draw_status_indicator(self, canvas, color):
        try:
            canvas.delete("all")
            canvas.create_oval(2, 2, 14, 14, fill=color, outline="black")
        except Exception:
            pass

    def set_target_connected(self, is_connected: bool):
        color = "#2ecc40" if is_connected else "#e74c3c"
        try:
            self._draw_status_indicator(self.target_status_canvas, color)
        except Exception:
            pass

    def set_lru_connected(self, is_connected: bool):
        color = "#2ecc40" if is_connected else "#e74c3c"
        try:
            self._draw_status_indicator(self.lru_status_canvas, color)
        except Exception:
            pass

    def show_status_message(self, text: str, timeout_ms: int = 3000):
        try:
            try:
                if self._status_after_id is not None:
                    self.after_cancel(self._status_after_id)
            except Exception:
                pass
            self.status_var.set(text)

            def _clear():
                try:
                    self.status_var.set("Ready")
                except Exception:
                    pass

            self._status_after_id = self.after(timeout_ms, _clear)
        except Exception:
            # Fallback: set the var and do not schedule clear
            try:
                self.status_var.set(text)
            except Exception:
                pass


class StatusBar(ttk.Frame):
    """Status bar widget containing connection indicators and rate/status text.

    Exposes small API so MainView can delegate status updates without managing
    layout details.
    """

    def __init__(self, parent):
        super().__init__(parent, relief=tk.SUNKEN)

        ttk.Label(self, text="Target:").pack(side=tk.LEFT, padx=(5, 2))
        self.target_status_canvas = tk.Canvas(self, width=16, height=16, highlightthickness=0)
        self.target_status_canvas.pack(side=tk.LEFT, padx=(0, 10))
        self._draw_status_indicator(self.target_status_canvas, "#e74c3c")

        ttk.Label(self, text="LRU:").pack(side=tk.LEFT, padx=(5, 2))
        self.lru_status_canvas = tk.Canvas(self, width=16, height=16, highlightthickness=0)
        self.lru_status_canvas.pack(side=tk.LEFT, padx=(0, 10))
        self._draw_status_indicator(self.lru_status_canvas, "#e74c3c")

        self.status_var = tk.StringVar(value="Ready")
        ttk.Label(self, textvariable=self.status_var, anchor=tk.W).pack(side=tk.LEFT, fill=tk.X, expand=True, padx=5)

        # Small rate indicator showing incoming real-state rate and PPI update rate
        try:
            self.rate_status_var = tk.StringVar(value="")
            ttk.Label(self, textvariable=self.rate_status_var, anchor=tk.E).pack(side=tk.RIGHT, padx=(4, 8))
        except Exception:
            self.rate_status_var = None

        # Id for scheduled status clear; used by show_status_message
        self._status_after_id: Optional[str] = None

    def _draw_status_indicator(self, canvas, color):
        try:
            canvas.delete("all")
            canvas.create_oval(2, 2, 14, 14, fill=color, outline="black")
        except Exception:
            pass

    def set_target_connected(self, is_connected: bool):
        color = "#2ecc40" if is_connected else "#e74c3c"
        try:
            self._draw_status_indicator(self.target_status_canvas, color)
        except Exception:
            pass

    def set_lru_connected(self, is_connected: bool):
        color = "#2ecc40" if is_connected else "#e74c3c"
        try:
            self._draw_status_indicator(self.lru_status_canvas, color)
        except Exception:
            pass

    def show_status_message(self, text: str, timeout_ms: int = 3000):
        try:
            try:
                if self._status_after_id is not None:
                    self.after_cancel(self._status_after_id)
            except Exception:
                pass
            self.status_var.set(text)

            def _clear():
                try:
                    self.status_var.set("Ready")
                except Exception:
                    pass

            self._status_after_id = self.after(timeout_ms, _clear)
        except Exception:
            # Fallback: set the var and do not schedule clear
            try:
                self.status_var.set(text)
            except Exception:
                pass