# app/tabs/dashboard.py
from __future__ import annotations
import tkinter as tk
from tkinter import ttk

class DashboardTab:
    """Zeigt dynamisch alle im Vehicle registrierten Dashboard-Metriken."""
    def __init__(self, parent, sim):
        self.sim = sim
        self.frame = ttk.Frame(parent, padding=8)
        self.tree = ttk.Treeview(self.frame, columns=("label","value","unit","key","source"), show="headings", height=12)
        self.tree.heading("label", text="Parameter")
        self.tree.heading("value", text="Wert")
        self.tree.heading("unit",  text="Einheit")
        self.tree.heading("key",   text="Key")
        self.tree.heading("source",text="Modul")
        self.tree.column("label", width=180, anchor="w")
        self.tree.column("value", width=120, anchor="e")
        self.tree.column("unit",  width=80,  anchor="w")
        self.tree.column("key",   width=180, anchor="w")
        self.tree.column("source",width=100, anchor="w")
        self.tree.grid(row=0, column=0, sticky="nsew")
        sb = ttk.Scrollbar(self.frame, orient="vertical", command=self.tree.yview)
        self.tree.configure(yscrollcommand=sb.set)
        sb.grid(row=0, column=1, sticky="ns")
        self.frame.columnconfigure(0, weight=1)
        self.frame.rowconfigure(0, weight=1)

        self._last_keys = None
        self._tick()

    def _format_value(self, val, fmt):
        if fmt:
            try:
                return f"{val:{fmt}}"
            except Exception:
                return str(val)
        return str(val)

    def _tick(self):
        snap = self.sim.v.dashboard_snapshot()
        specs = snap["specs"]
        values = snap["values"]

        keys = sorted(specs.keys(), key=lambda k: (specs[k].get("priority", 999), specs[k].get("label", k)))
        if keys != self._last_keys:
            # rebuild table
            for item in self.tree.get_children():
                self.tree.delete(item)
            for k in keys:
                spec = specs[k]
                lbl = spec.get("label", k)
                unit = spec.get("unit", "")
                src  = spec.get("source", "")
                val  = self._format_value(values.get(k, ""), spec.get("fmt"))
                self.tree.insert("", "end", iid=k, values=(lbl, val, unit, k, src))
            self._last_keys = keys
        else:
            # update values only
            for k in keys:
                spec = specs[k]
                val = self._format_value(values.get(k, ""), spec.get("fmt"))
                try:
                    self.tree.set(k, "value", val)
                except tk.TclError:
                    pass

        try:
            self.frame.after(200, self._tick)
        except tk.TclError:
            pass

    # Config-API no-ops (für Konsistenz mit anderen Tabs)
    def save_into_config(self, out):  # pragma: no cover
        pass
    def load_from_config(self, cfg):  # pragma: no cover
        pass