# device_controller.py
import threading, queue, time, math, os, csv

SAMPLE_RATE = 10_000.0   # 10 kS/s (Dummy)
DT = 1.0 / SAMPLE_RATE
CHUNK = 500              # 50 ms pro Chunk
OUTDIR = "./logs"

def _norm_channel(ch):
    return {0:"A", 1:"B"}.get(ch, str(ch).upper())

class DeviceController:
    def __init__(self, session_manager, dev):
        self.sm   = session_manager   # <— SessionManager (teilt die Session)
        self.dev  = dev
        self.serial = getattr(dev, "serial", "UNKNOWN")

        self.cmdq = queue.Queue()
        self.writer_q = queue.Queue(maxsize=200)
        self.stop_evt = threading.Event()
        self.running = False

        self.reader_t = threading.Thread(target=self.reader_loop, daemon=True)
        self.writer_t = threading.Thread(target=self.writer_loop, daemon=True)

    # ==== Public API (nicht blockierend) ====
    def start(self):
        if not self.reader_t.is_alive(): self.reader_t.start()
        if not self.writer_t.is_alive(): self.writer_t.start()
        self.cmdq.put(("start", None))   # nur anstoßen

    def stop(self):
        self.cmdq.put(("stop", None))    # nur anstoßen

    def shutdown(self):
        # Für Programmende
        self.stop()
        self.stop_evt.set()

    def set_mode(self, ch, mode):
        key = _norm_channel(ch)
        self.dev.channels[key].mode = mode

    # ==== Threads ====
    def reader_loop(self):
        print(f"[{self.serial}] Reader gestartet")
        while not self.stop_evt.is_set():
            # Kommandos (Start/Stop) abarbeiten
            try:
                cmd, arg = self.cmdq.get_nowait()
                if cmd == "start" and not self.running:
                    n = self.sm.start()        # evtl. startet hier die Session
                    self.running = True
                    print(f"[{self.serial}] RUNNING (Session-Clients={n})")
                elif cmd == "stop" and self.running:
                    n = self.sm.stop()         # evtl. endet hier die Session
                    self.running = False
                    print(f"[{self.serial}] STOPPED (Session-Clients={n})")
            except queue.Empty:
                pass

            if not self.running:
                time.sleep(0.02)
                continue

            # ——— Daten lesen (blockierend, aber im Worker-Thread) ———
            try:
                # pysmu: read liefert Liste von [VA, IA, VB, IB]
                samples = self.dev.read(CHUNK, -1)  # je nach Version evtl. self.dev.read(CHUNK)
                if not samples:
                    time.sleep(0.001)
                    continue

                va = [row[0] for row in samples]
                vb = [row[2] for row in samples]

                # in Writer-Queue schieben
                try:
                    self.writer_q.put((time.time(), va, vb), timeout=0.5)
                except queue.Full:
                    print(f"[{self.serial}] WARN: writer_q voll – dropping chunk")
            except Exception as e:
                # NICHT schlucken – sichtbar loggen!
                print(f"[{self.serial}] Read-Fehler: {e}")
                time.sleep(0.01)

        print(f"[{self.serial}] Reader beendet")

    def writer_loop(self):
        os.makedirs(OUTDIR, exist_ok=True)
        fn = os.path.join(OUTDIR, f"{time.strftime('%Y%m%d_%H%M%S')}_{self.serial}.csv")
        sample_idx = 0
        written_rows = 0
        print(f"[{self.serial}] Writer schreibt nach: {fn}")
        try:
            with open(fn, "w", newline="") as f:
                w = csv.writer(f)
                w.writerow(["t_rel_s", "A", "B"])  # Wide-Format
                while not (self.stop_evt.is_set() and self.writer_q.empty()):
                    try:
                        ts, va, vb = self.writer_q.get(timeout=0.5)
                    except queue.Empty:
                        continue

                    n = min(len(va), len(vb))
                    for i in range(n):
                        t_rel = (sample_idx + i) * DT
                        w.writerow([t_rel, va[i], vb[i]])
                    sample_idx += n
                    written_rows += n

                    if written_rows and written_rows % (10*CHUNK) == 0:
                        f.flush()
                        print(f"[{self.serial}] rows={written_rows}")
        except Exception as e:
            print(f"[{self.serial}] Writer-Fehler: {e}")
        finally:
            print(f"[{self.serial}] Writer beendet: {fn}")