# app/gui/app.py
from __future__ import annotations
import json, threading, time, tkinter as tk
from tkinter import ttk, messagebox, filedialog

from app.config import load_settings, setup_logging
from app.obd2 import ObdResponder, make_speed_response, make_rpm_response
from app.simulation.simulator import VehicleSimulator
from app.simulation.ui import discover_ui_tabs

from app.gui.trace import TraceView
from app.gui.dashboard import DashboardView
from app.gui.can_panel import CanPanel

def launch_gui():
    cfg = load_settings(); setup_logging(cfg)

    can_iface   = (cfg.get("can", {}).get("interface")) or "can0"
    resp_id_raw = (cfg.get("can", {}).get("resp_id")) or "0x7E8"
    try: resp_id = int(resp_id_raw, 16) if isinstance(resp_id_raw, str) else int(resp_id_raw)
    except Exception: resp_id = 0x7E8
    timeout_ms = cfg.get("can", {}).get("timeout_ms", 200)
    bitrate    = cfg.get("can", {}).get("baudrate", 500000)

    # Simulator + OBD2
    sim = VehicleSimulator()
    responder = ObdResponder(interface=can_iface, resp_id=resp_id, timeout_ms=timeout_ms)
    responder.register_pid(0x0D, lambda: make_speed_response(int(round(sim.snapshot().get("speed_kmh", 0)))))
    responder.register_pid(0x0C, lambda: make_rpm_response(int(sim.snapshot().get("rpm", 0))))

    # Physics thread
    running = True
    def physics_loop():
        last = time.monotonic()
        while running:
            now = time.monotonic()
            dt = min(0.05, max(0.0, now - last)); last = now
            sim.update(dt)
            time.sleep(0.02)
    threading.Thread(target=physics_loop, daemon=True).start()

    # --- Tk Window ---------------------------------------------------------
    root = tk.Tk(); root.title("OBD-II ECU Simulator – SocketCAN")
    root.geometry(f"{cfg.get('ui',{}).get('window',{}).get('width',1100)}x{cfg.get('ui',{}).get('window',{}).get('height',720)}")

    # ================== Panedwindow-Layout ==================
    # Haupt-Split: Links/Rechts (ein senkrechter Trenner)
    main_pw = tk.PanedWindow(root, orient="horizontal")
    main_pw.pack(fill="both", expand=True)

    # linke Spalte
    left_pw = tk.PanedWindow(main_pw, orient="vertical")
    main_pw.add(left_pw)

    # rechte Spalte
    right_pw = tk.PanedWindow(main_pw, orient="vertical")
    main_pw.add(right_pw)

    # --- Callback-Bridge für Rebind: erst später existiert trace_view ---
    trace_ref = {"obj": None}
    def on_rebind_iface(new_iface: str):
        tv = trace_ref["obj"]
        if tv:
            tv.rebind_interface(new_iface)

    # ----- Top-Left: CAN panel -----
    can_panel = CanPanel(
        parent=left_pw, responder=responder,
        initial_iface=can_iface, initial_resp_id=resp_id,
        initial_timeout_ms=timeout_ms, initial_bitrate=bitrate,
        on_rebind_iface=on_rebind_iface
    )
    left_pw.add(can_panel.frame)

    # ----- Bottom-Left: Trace -----
    trace_view = TraceView(parent=left_pw, responder=responder, iface_initial=can_iface)
    trace_ref["obj"] = trace_view
    left_pw.add(trace_view.frame)

    # ----- Top-Right: dynamic tabs -----
    nb = ttk.Notebook(right_pw)
    ui_tabs = discover_ui_tabs(nb, sim)
    for t in ui_tabs:
        title = getattr(t, "TITLE", getattr(t, "NAME", t.__class__.__name__))
        nb.add(t.frame, text=title)
    right_pw.add(nb)

    # ----- Bottom-Right: Dashboard -----
    dash_view = DashboardView(parent=right_pw, sim=sim, refresh_ms=250)
    right_pw.add(dash_view.frame)

    # ---------------- Menü (Load/Save) ----------------
    menubar = tk.Menu(root); filemenu = tk.Menu(menubar, tearoff=0)
    def do_load():
        path = filedialog.askopenfilename(filetypes=[("JSON","*.json"),("All","*.*")])
        if not path: return
        with open(path,"r",encoding="utf-8") as f: data = json.load(f)
        for t in ui_tabs:
            if hasattr(t, "load_from_config"): t.load_from_config(data)
        sim.load_config(data)
        messagebox.showinfo("Simulator", "Konfiguration geladen.")
    def do_save():
        cfg_out = sim.export_config()
        for t in ui_tabs:
            if hasattr(t, "save_into_config"): t.save_into_config(cfg_out)
        path = filedialog.asksaveasfilename(defaultextension=".json", filetypes=[("JSON","*.json")])
        if not path: return
        with open(path,"w",encoding="utf-8") as f: json.dump(cfg_out, f, indent=2)
        messagebox.showinfo("Simulator", "Konfiguration gespeichert.")
    filemenu.add_command(label="Konfiguration laden…", command=do_load)
    filemenu.add_command(label="Konfiguration speichern…", command=do_save)
    filemenu.add_separator(); filemenu.add_command(label="Beenden", command=root.destroy)
    menubar.add_cascade(label="Datei", menu=filemenu); root.config(menu=menubar)

    # Title updater
    def tick_title():
        snap = sim.snapshot()
        root.title(f"OBD-II ECU Simulator – RPM {int(snap.get('rpm',0))} | {int(round(snap.get('speed_kmh',0)))} km/h")
        try: root.after(300, tick_title)
        except tk.TclError: pass
    tick_title()

    def on_close():
        nonlocal running
        running = False
        try: trace_view.stop()
        except Exception: pass
        try: responder.stop()
        finally:
            root.destroy()
    root.protocol("WM_DELETE_WINDOW", on_close)
    root.mainloop()