import {
  createMotionAgentProvider,
  DEFAULT_AGENT_URL,
} from "./motion-agent-provider.js";
import { createBrowserCameraProvider } from "./motion-browser-provider.js";
import {
  DEFAULT_MOTION_PROVIDER,
  MOTION_PROVIDER_AGENT,
  normalizeGestureMessage,
  normalizeMotionProvider,
  normalizeSkeletonMessage,
} from "./motion-protocol.js";
import {
  MOTION_CONTROL_STATE_EVENT,
  MOTION_DEBUG_FRAME_EVENT,
  MOTION_DEBUG_VIDEO_SOURCE_EVENT,
  MOTION_RECOGNITION_PAUSE_EVENT,
} from "./motion-events.js";

const DEFAULT_MIN_CONFIDENCE = 0.72;
const DEFAULT_COOLDOWN_MS = 120;
const DEFAULT_FOCUS_COOLDOWN_MS = 900;
const DEFAULT_LAYER_COOLDOWN_MS = 1400;
const DEFAULT_CONFIRM_COOLDOWN_MS = 1200;
const ENABLED_STORAGE_KEY = "planet-earth-motion-control-enabled";
const URL_STORAGE_KEY = "planet-earth-motion-control-url";

const GESTURE_POLICIES = {
  rotate_left: { group: "rotate_left", cooldownMs: DEFAULT_COOLDOWN_MS },
  rotate_right: { group: "rotate_right", cooldownMs: DEFAULT_COOLDOWN_MS },
  rotate_up: { group: "rotate_up", cooldownMs: DEFAULT_COOLDOWN_MS },
  rotate_down: { group: "rotate_down", cooldownMs: DEFAULT_COOLDOWN_MS },
  zoom_in: { group: "zoom_in", cooldownMs: DEFAULT_COOLDOWN_MS },
  zoom_out: { group: "zoom_out", cooldownMs: DEFAULT_COOLDOWN_MS },
  focus_prev: { group: "focus", cooldownMs: DEFAULT_FOCUS_COOLDOWN_MS },
  focus_next: { group: "focus", cooldownMs: DEFAULT_FOCUS_COOLDOWN_MS },
  layer_prev: { group: "layer", cooldownMs: DEFAULT_LAYER_COOLDOWN_MS },
  layer_next: { group: "layer", cooldownMs: DEFAULT_LAYER_COOLDOWN_MS },
  confirm: { group: "confirm", cooldownMs: DEFAULT_CONFIRM_COOLDOWN_MS },
};

function getSearchParams() {
  if (typeof window === "undefined") return new URLSearchParams();
  return new URLSearchParams(window.location.search || "");
}

function dispatchWindowEvent(name, detail) {
  if (typeof window === "undefined") return;
  if (name === MOTION_DEBUG_VIDEO_SOURCE_EVENT) {
    window.__earthMotionDebugVideoSource = detail;
  }
  window.dispatchEvent(new CustomEvent(name, { detail }));
}

function getConfiguredAgentUrl() {
  if (typeof window === "undefined") return DEFAULT_AGENT_URL;
  const search = getSearchParams();
  const queryUrl = search.get("motionAgent");
  if (queryUrl) return queryUrl;
  const storedUrl = window.localStorage?.getItem(URL_STORAGE_KEY);
  return storedUrl || DEFAULT_AGENT_URL;
}

export function getConfiguredMotionProvider(fallback = DEFAULT_MOTION_PROVIDER) {
  const search = getSearchParams();
  if (search.get("motionAgent")) return MOTION_PROVIDER_AGENT;
  const queryProvider = search.get("motionProvider");
  if (queryProvider) return normalizeMotionProvider(queryProvider, fallback);
  return normalizeMotionProvider(fallback, DEFAULT_MOTION_PROVIDER);
}

export function shouldEnableMotionControl() {
  if (typeof window === "undefined") return false;
  const search = getSearchParams();
  if (search.get("motion") === "1") return true;
  if (search.get("motion") === "0") return false;
  return window.localStorage?.getItem(ENABLED_STORAGE_KEY) === "true";
}

export function createMotionControlAdapter(options = {}) {
  const {
    enabled = false,
    provider = DEFAULT_MOTION_PROVIDER,
    url = getConfiguredAgentUrl(),
    minConfidence = DEFAULT_MIN_CONFIDENCE,
    cooldownMs = DEFAULT_COOLDOWN_MS,
    providerFactories = {},
    WebSocketCtor = typeof WebSocket !== "undefined" ? WebSocket : null,
    onRotate = () => false,
    onZoom = () => false,
    onConfirm = () => false,
    onFocus = () => false,
    onLayer = () => false,
    onSkeleton = () => {},
    onStatus = () => {},
    onVideoSource = (detail) => dispatchWindowEvent(MOTION_DEBUG_VIDEO_SOURCE_EVENT, detail),
    nowFn = () => Date.now(),
  } = options;

  const selectedProvider = getConfiguredMotionProvider(provider);
  let disposed = false;
  let activeProvider = null;
  let connected = false;
  let recognitionPaused = false;
  const lastHandledByGestureGroup = new Map();

  function emitState(detail) {
    connected = Boolean(detail?.connected);
    dispatchWindowEvent(MOTION_CONTROL_STATE_EVENT, {
      provider: selectedProvider,
      connected,
      recognitionPaused,
      ...detail,
    });
  }

  function setRecognitionPaused(nextPaused) {
    recognitionPaused = Boolean(nextPaused);
    emitState({ provider: selectedProvider, connected });
  }

  function shouldHandleGesture(event) {
    if (!event || event.confidence < minConfidence) return false;
    const policy = GESTURE_POLICIES[event.gesture] || {
      group: event.gesture,
      cooldownMs,
    };
    const effectiveCooldownMs =
      policy.cooldownMs === DEFAULT_COOLDOWN_MS ? cooldownMs : policy.cooldownMs;
    const now = nowFn();
    const last = lastHandledByGestureGroup.get(policy.group);
    if (last !== undefined && now - last < effectiveCooldownMs) return false;
    lastHandledByGestureGroup.set(policy.group, now);
    return true;
  }

  function handleGesture(event) {
    if (recognitionPaused) return;
    if (!shouldHandleGesture(event)) return;
    if (event.gesture === "rotate_left" || event.gesture === "rotate_right") {
      onRotate("horizontal", event.gesture === "rotate_left" ? "left" : "right", event.intensity, event);
    } else if (event.gesture === "rotate_up" || event.gesture === "rotate_down") {
      onRotate("vertical", event.gesture === "rotate_up" ? "up" : "down", event.intensity, event);
    } else if (event.gesture === "zoom_in") {
      onZoom("in", event.intensity, event);
    } else if (event.gesture === "zoom_out") {
      onZoom("out", event.intensity, event);
    } else if (event.gesture === "focus_prev") {
      onFocus("prev", event);
    } else if (event.gesture === "focus_next") {
      onFocus("next", event);
    } else if (event.gesture === "layer_prev") {
      onLayer("prev", event);
    } else if (event.gesture === "layer_next") {
      onLayer("next", event);
    } else if (event.gesture === "confirm") {
      onConfirm(event);
    }
  }

  function handleProviderMessage(rawMessage) {
    let data = rawMessage;
    if (typeof rawMessage === "string") {
      try {
        data = JSON.parse(rawMessage);
      } catch (_error) {
        return;
      }
    }

    const gesture = normalizeGestureMessage(data, selectedProvider);
    if (gesture) {
      handleGesture(gesture);
      return;
    }

    const skeleton = normalizeSkeletonMessage(data, selectedProvider);
    if (skeleton) {
      const nextSkeleton = recognitionPaused
        ? { ...skeleton, matchedGesture: null, confidence: 0 }
        : skeleton;
      onSkeleton(nextSkeleton);
      dispatchWindowEvent(MOTION_DEBUG_FRAME_EVENT, nextSkeleton);
      return;
    }

    if (data?.type === "status" || data?.type === "heartbeat") {
      emitState({ provider: selectedProvider, connected, message: data });
    }
  }

  function createProvider() {
    const sharedOptions = {
      onMessage: handleProviderMessage,
      onState: emitState,
      onStatus,
      onVideoSource,
    };
    if (providerFactories[selectedProvider]) {
      return providerFactories[selectedProvider]({
        ...sharedOptions,
        url,
        WebSocketCtor,
      });
    }
    if (selectedProvider === MOTION_PROVIDER_AGENT) {
      return createMotionAgentProvider({
        ...sharedOptions,
        url,
        WebSocketCtor,
      });
    }
    return createBrowserCameraProvider(sharedOptions);
  }

  return {
    start() {
      if (!enabled || disposed) return false;
      if (typeof window !== "undefined") {
        window.addEventListener(MOTION_RECOGNITION_PAUSE_EVENT, handleRecognitionPause);
      }
      activeProvider = createProvider();
      const result = activeProvider.start();
      emitState({ provider: selectedProvider, connected: activeProvider.isConnected?.() || false });
      return result;
    },
    stop() {
      disposed = true;
      if (typeof window !== "undefined") {
        window.removeEventListener(MOTION_RECOGNITION_PAUSE_EVENT, handleRecognitionPause);
      }
      activeProvider?.stop?.();
      activeProvider = null;
      connected = false;
      dispatchWindowEvent(MOTION_DEBUG_VIDEO_SOURCE_EVENT, {
        provider: selectedProvider,
        source: null,
        active: false,
      });
      emitState({ provider: selectedProvider, connected: false });
    },
    isConnected() {
      return Boolean(activeProvider?.isConnected?.());
    },
    getProvider() {
      return selectedProvider;
    },
    handleMessage: handleProviderMessage,
  };

  function handleRecognitionPause(event) {
    setRecognitionPaused(event?.detail?.paused === true);
  }
}

export {
  DEFAULT_AGENT_URL,
  DEFAULT_MOTION_PROVIDER,
  normalizeGestureMessage,
  normalizeSkeletonMessage,
  normalizeMotionProvider,
};