import { useRouter } from "next/navigation";
import type { RefObject } from "react";
import { useEffect, useRef } from "react";
import type { Neighbors } from "../types.ts";

interface UseNavigationProps {
  neighbors: Neighbors;
  isVideo: boolean;
  mediaContainerRef: RefObject<HTMLDivElement | null>;
  videoRef?: RefObject<HTMLVideoElement | null>;
  prevImg?: () => void;
  nextImg?: () => void;
  togglePlay: () => void;
}

export function useNavigation({
  neighbors,
  isVideo,
  mediaContainerRef,
  videoRef,
  prevImg,
  nextImg,
  togglePlay,
}: UseNavigationProps): void {
  const router = useRouter();
  const wheelCooldownRef = useRef<number>(0);

  // 预取路由
  useEffect(() => {
    if (!neighbors) return;
    if (neighbors.next) router.prefetch(`/aweme/${neighbors.next.aweme_id}`);
    if (neighbors.prev) router.prefetch(`/aweme/${neighbors.prev.aweme_id}`);
  }, [neighbors, router]);

  // 鼠标滚轮切换
  useEffect(() => {
    const el = mediaContainerRef.current;
    if (!el) return;

    const onWheel = (e: WheelEvent): void => {
      if (e.ctrlKey) return;
      const now = performance.now();
      if (now - wheelCooldownRef.current < 700) return;
      const dy = e.deltaY;
      if (Math.abs(dy) < 40) return;

      if ((dy > 0 && neighbors?.next) || (dy < 0 && neighbors?.prev)) {
        e.preventDefault();
      }

      if (dy > 0 && neighbors?.next) {
        wheelCooldownRef.current = now;
        router.push(`/aweme/${neighbors.next.aweme_id}`);
      } else if (dy < 0 && neighbors?.prev) {
        wheelCooldownRef.current = now;
        router.push(`/aweme/${neighbors.prev.aweme_id}`);
      }
    };

    el.addEventListener("wheel", onWheel, { passive: false });
    return () => el.removeEventListener("wheel", onWheel);
  }, [neighbors, mediaContainerRef, router]);

  // 键盘快捷键
  useEffect(() => {
    const onKeyDown = (e: KeyboardEvent): void => {
      const target = e.target as HTMLElement | null;
      if (
        target &&
        (target.tagName === "INPUT" ||
          target.tagName === "TEXTAREA" ||
          target.isContentEditable)
      ) {
        return;
      }

      const key = e.key.toLowerCase();

      if (key === "arrowup" || key === "w") {
        e.preventDefault();
        const now = performance.now();
        if (now - wheelCooldownRef.current < 700) return;
        if (neighbors?.prev) {
          wheelCooldownRef.current = now;
          router.push(`/aweme/${neighbors.prev.aweme_id}`);
        }
      } else if (key === "arrowdown" || key === "s") {
        e.preventDefault();
        const now = performance.now();
        if (now - wheelCooldownRef.current < 700) return;
        if (neighbors?.next) {
          wheelCooldownRef.current = now;
          router.push(`/aweme/${neighbors.next.aweme_id}`);
        }
      } else if (key === "arrowleft" || key === "a") {
        e.preventDefault();
        if (isVideo) {
          const v = videoRef?.current;
          if (v && v.duration) {
            v.currentTime = Math.max(0, v.currentTime - 5);
          }
        } else {
          prevImg?.();
        }
      } else if (key === "arrowright" || key === "d") {
        e.preventDefault();
        if (isVideo) {
          const v = videoRef?.current;
          if (v && v.duration) {
            v.currentTime = Math.min(v.duration, v.currentTime + 5);
          }
        } else {
          nextImg?.();
        }
      } else if (key === " ") {
        e.preventDefault();
        togglePlay();
      }
    };

    window.addEventListener("keydown", onKeyDown);
    return () => window.removeEventListener("keydown", onKeyDown);
  }, [isVideo, neighbors, router, videoRef, prevImg, nextImg, togglePlay]);

  // 仅在无历史记录的独立新标签页首次进入时注入一次返回兜底，避免连续刷视频时无限叠加 history 栈
  useEffect(() => {
    const currentState = window.history.state as
      | { interceptBack?: boolean }
      | null
      | undefined;
    if (window.history.length <= 1 && !currentState?.interceptBack) {
      window.history.pushState({ ...currentState, interceptBack: true }, "");
    }

    const handlePopState = (): void => {
      if (window.history.length <= 1) {
        window.close();
        setTimeout(() => {
          if (!document.hidden) {
            router.push("/");
          }
        }, 100);
      }
    };

    window.addEventListener("popstate", handlePopState);
    return () => {
      window.removeEventListener("popstate", handlePopState);
    };
  }, [router]);
}