"use client";

import { useEffect, useRef, useState } from "react";
import { toast } from "sonner";
import {
  disconnectAll,
  getBatteryLevel,
  getButtplugClientHandle,
  getDevice,
  isWebBluetoothSupported,
  startScanning,
  stopScanning,
} from "@/lib/buttplug/client";
import { buildOutputCommand, findFeature } from "@/lib/buttplug/commands";
import type { ButtplugRuntime } from "@/lib/buttplug/commands";
import { throttledSend } from "@/lib/buttplug/throttle";
import { eventBuffer } from "@/lib/buttplug/event-buffer";
import { actuatorKey, useButtplugStore } from "@/lib/buttplug/store";
import type { ConnectedDeviceInfo } from "@/lib/buttplug/types";
import { DeviceScanPanel } from "./DeviceScanPanel";
import { DeviceCard } from "./DeviceCard";
import { RecordControls } from "./RecordControls";
import { SaveRecordingDialog } from "@/components/recordings/SaveRecordingDialog";
import { Card, CardContent } from "@/components/ui/card";

interface ActivePlaySession {
  id: number;
  startedAt: number;
  sessionDeviceIdByDeviceIndex: Map<number, number>;
}

function formatElapsed(ms: number): string {
  const totalSeconds = Math.floor(ms / 1000);
  const minutes = Math.floor(totalSeconds / 60);
  const seconds = totalSeconds % 60;
  return `${minutes}:${seconds.toString().padStart(2, "0")}`;
}

export function ButtplugConsole() {
  const supported = isWebBluetoothSupported();
  const connected = useButtplugStore((s) => s.connected);
  const scanning = useButtplugStore((s) => s.scanning);
  const devices = useButtplugStore((s) => s.devices);
  const actuatorValues = useButtplugStore((s) => s.actuatorValues);
  const setActuatorValue = useButtplugStore((s) => s.setActuatorValue);
  const batteryLevels = useButtplugStore((s) => s.batteryLevels);
  const setBatteryLevel = useButtplugStore((s) => s.setBatteryLevel);
  const removeDevice = useButtplugStore((s) => s.removeDevice);
  const setRecording = useButtplugStore((s) => s.setRecording);
  const storeError = useButtplugStore((s) => s.error);

  const [activeSession, setActiveSession] = useState<ActivePlaySession | null>(null);
  const [elapsedMs, setElapsedMs] = useState(0);
  const [sessionBusy, setSessionBusy] = useState(false);
  const [savePromptSessionId, setSavePromptSessionId] = useState<number | null>(null);
  const [transmittingKey, setTransmittingKey] = useState<string | null>(null);

  const runtimeRef = useRef<ButtplugRuntime | null>(null);

  useEffect(() => {
    if (!activeSession) return;
    const interval = setInterval(() => setElapsedMs(Date.now() - activeSession.startedAt), 250);
    return () => clearInterval(interval);
  }, [activeSession]);

  useEffect(() => {
    return () => {
      void disconnectAll();
    };
  }, []);

  useEffect(() => {
    const devicesWithBattery = Object.values(devices).filter((d) => d.hasBattery);
    if (devicesWithBattery.length === 0) return;

    function refresh() {
      for (const device of devicesWithBattery) {
        void getBatteryLevel(device.index).then((level) => setBatteryLevel(device.index, level));
      }
    }

    refresh();
    const interval = setInterval(refresh, 60_000);
    return () => clearInterval(interval);
  }, [devices, setBatteryLevel]);

  async function ensureRuntime(): Promise<ButtplugRuntime> {
    if (runtimeRef.current) return runtimeRef.current;
    const { runtime } = await getButtplugClientHandle();
    runtimeRef.current = runtime;
    return runtime;
  }

  async function handleScan() {
    try {
      await ensureRuntime();
      await startScanning();
    } catch {
      toast.error("Could not start scanning - check Bluetooth is on and permitted.");
    }
  }

  async function handleStartSession() {
    setSessionBusy(true);
    try {
      const deviceList = Object.values(devices);
      const body = {
        kind: "live" as const,
        devices: deviceList.map((d) => ({
          slotLabel: d.displayName ?? d.name,
          bleName: d.name,
          capabilities: { outputs: [...new Set(d.actuators.map((a) => a.outputType))], featureCount: d.actuators.length },
        })),
      };
      const res = await fetch("/api/play-sessions", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(body),
      });
      if (!res.ok) throw new Error("failed to start session");
      const data: { session: { id: number; startedAt: number }; sessionDevices: { id: number }[] } =
        await res.json();

      const sessionDeviceIdByDeviceIndex = new Map<number, number>();
      deviceList.forEach((d, i) => {
        const row = data.sessionDevices[i];
        if (row) sessionDeviceIdByDeviceIndex.set(d.index, row.id);
      });

      eventBuffer.start(data.session.id, data.session.startedAt);
      sessionDeviceIdByDeviceIndex.forEach((sessionDeviceId, deviceIndex) => {
        eventBuffer.registerSessionDevice(deviceIndex, sessionDeviceId);
      });

      setActiveSession({
        id: data.session.id,
        startedAt: data.session.startedAt,
        sessionDeviceIdByDeviceIndex,
      });
      setElapsedMs(0);
      setRecording(true);
    } catch {
      toast.error("Could not start session.");
    } finally {
      setSessionBusy(false);
    }
  }

  async function handleEndSession() {
    if (!activeSession) return;
    setSessionBusy(true);
    eventBuffer.stop();
    setRecording(false);
    await fetch(`/api/play-sessions/${activeSession.id}`, {
      method: "PATCH",
      headers: { "Content-Type": "application/json" },
      body: JSON.stringify({ status: "completed" }),
    });
    setSavePromptSessionId(activeSession.id);
    setActiveSession(null);
    setSessionBusy(false);
  }

  async function handleActuatorChange(device: ConnectedDeviceInfo, featureIndex: number, value: number) {
    const key = actuatorKey(device.index, featureIndex);
    setActuatorValue(device.index, featureIndex, value);

    const actuator = device.actuators.find((a) => a.featureIndex === featureIndex);
    if (!actuator) return;

    throttledSend(
      key,
      async (v) => {
        try {
          const runtime = await ensureRuntime();
          const liveDevice = await getDevice(device.index);
          const feature = liveDevice && findFeature(liveDevice, featureIndex);
          if (!liveDevice || !feature) {
            toast.error(`${device.name}: device not found - try reconnecting.`);
            return;
          }
          setTransmittingKey(key);
          const cmd = buildOutputCommand(runtime, actuator, v);
          await feature.runOutput(cmd);
          eventBuffer.record({ deviceIndex: device.index, commandType: actuator.outputType, featureIndex, value: v });
        } catch (err) {
          const message = err instanceof Error ? err.message : String(err);
          toast.error(`${device.name}: command failed - ${message}`);
        } finally {
          setTransmittingKey((k) => (k === key ? null : k));
        }
      },
      value,
    );
  }

  async function handleStopDevice(device: ConnectedDeviceInfo) {
    const liveDevice = await getDevice(device.index);
    await liveDevice?.stop();
    eventBuffer.record({ deviceIndex: device.index, commandType: "stop", featureIndex: 0, value: 0 });
    device.actuators.forEach((a) => setActuatorValue(device.index, a.featureIndex, 0));
  }

  async function handleDisconnectDevice(device: ConnectedDeviceInfo) {
    // Buttplug's protocol has no per-device disconnect message - only a
    // whole-client disconnect() and stop() (halts actuators). Stopping it and
    // removing it from local state is the closest equivalent: the card
    // disappears and it stops receiving commands, though the underlying BLE
    // link may persist until the whole client disconnects.
    const liveDevice = await getDevice(device.index);
    await liveDevice?.stop().catch(() => {});
    removeDevice(device.index);
  }

  if (!supported) {
    return (
      <Card className="bp-glass">
        <CardContent className="py-6 text-sm text-muted-foreground">
          This browser doesn&apos;t support Web Bluetooth, so device control isn&apos;t available here. Use a
          Chromium-based desktop or Android browser (Chrome, Edge) over HTTPS. iOS and Safari can&apos;t run
          Web Bluetooth at all, on any browser - this is an Apple platform limitation, not a bug.
        </CardContent>
      </Card>
    );
  }

  return (
    <div className="flex flex-col gap-6">
      <div className="flex flex-wrap items-center justify-between gap-4">
        <DeviceScanPanel scanning={scanning} onScan={handleScan} onStopScan={() => void stopScanning()} />
        <RecordControls
          active={activeSession !== null}
          elapsedLabel={formatElapsed(elapsedMs)}
          disabled={!connected || Object.keys(devices).length === 0}
          busy={sessionBusy}
          onStart={handleStartSession}
          onEnd={handleEndSession}
        />
      </div>

      {storeError && <p className="text-sm text-destructive">{storeError}</p>}

      {Object.keys(devices).length === 0 ? (
        <Card className="bp-glass">
          <CardContent className="py-6 text-sm text-muted-foreground">
            No devices connected yet. Scan to discover nearby toys, then select one from your browser&apos;s
            pairing prompt.
          </CardContent>
        </Card>
      ) : (
        <div className="grid gap-4 sm:grid-cols-2">
          {Object.values(devices).map((device) => (
            <DeviceCard
              key={device.index}
              device={device}
              batteryLevel={batteryLevels[device.index] ?? null}
              actuatorValues={Object.fromEntries(
                device.actuators.map((a) => [a.featureIndex, actuatorValues[actuatorKey(device.index, a.featureIndex)] ?? 0]),
              )}
              transmittingFeatureIndex={
                transmittingKey?.startsWith(`${device.index}:`)
                  ? Number(transmittingKey.split(":")[1])
                  : null
              }
              onActuatorChange={(featureIndex, value) => void handleActuatorChange(device, featureIndex, value)}
              onStop={() => void handleStopDevice(device)}
              onDisconnect={() => void handleDisconnectDevice(device)}
            />
          ))}
        </div>
      )}

      <SaveRecordingDialog
        playSessionId={savePromptSessionId}
        onClose={() => setSavePromptSessionId(null)}
        onSaved={() => setSavePromptSessionId(null)}
      />
    </div>
  );
}