"use client";

import Link from "next/link";
import { useEffect, useState } from "react";
import { CATEGORIES, slugifyCategory } from "./categories";
import { useSession } from "next-auth/react";

type HeaderProps = {
  forceScrolled?: boolean;
};

export default function MobileHeader({ forceScrolled = false }: HeaderProps) {
  const [isShrunk, setIsShrunk] = useState(forceScrolled);
  const [isHidden, setIsHidden] = useState(false);
  const [touchStartY, setTouchStartY] = useState<number | null>(null);
  useSession();

  const categoryIcons: Record<string, string> = {
    Interior: "/categories/cat-interior.png",
    Tools: "/categories/cat-tools.png",
    Exterior: "/categories/cat-exterior.png",
    Drivetrain: "/categories/cat-drivetrain.png",
    Lighting: "/categories/cat-lighting.png",
    Suspension: "/categories/cat-suspension.png",
    Audio: "/categories/cat-audio.png",
    Performance: "/categories/cat-performance.png",
  };

  useEffect(() => {
    if (forceScrolled) {
      setIsShrunk(true);
      setIsHidden(false);
      return;
    }

    const SHRINK_AT = 140;
    const EXPAND_AT = 80;
    const onScroll = () => {
      const y = window.scrollY;
      setIsShrunk((prev) => (prev ? y > EXPAND_AT : y > SHRINK_AT));
      setIsHidden((prev) => (y > SHRINK_AT ? prev : false));
    };
    onScroll();
    window.addEventListener("scroll", onScroll, { passive: true });
    return () => window.removeEventListener("scroll", onScroll);
  }, [forceScrolled]);

  const handleTouchStart = (e: React.TouchEvent) => {
    setTouchStartY(e.touches[0]?.clientY ?? null);
  };

  const handleTouchEnd = (e: React.TouchEvent) => {
    if (touchStartY === null) return;
    const endY = e.changedTouches[0]?.clientY ?? touchStartY;
    const delta = endY - touchStartY;
    const SWIPE_THRESHOLD = 40;
    if (isShrunk && !isHidden && delta < -SWIPE_THRESHOLD) {
      setIsHidden(true);
    } else if (isHidden && delta > SWIPE_THRESHOLD) {
      setIsHidden(false);
    }
    setTouchStartY(null);
  };

  return (
    <>
      <header
        className={`so-header so-header--mobile${isShrunk ? " so-header--shrunk" : ""}${
          isHidden ? " so-header--hidden" : ""
        }`}
        onTouchStart={handleTouchStart}
        onTouchEnd={handleTouchEnd}
      >
        <div className="container so-header__mobile">
          <div className="so-header__top">
            <Link href="/" className="so-header__logo-wrap">
              <img
                src="/icons/logo.png"
                className="so-header__logo"
                alt="Shifted Offroad"
              />
            </Link>
          </div>

          <div className="so-header__categories">
          <nav className="so-header__nav so-header__nav--mobile">
            {CATEGORIES.map((c) => (
              <Link
                key={c}
                href={`/category/${slugifyCategory(c)}`}
                className="so-navitem"
                style={{
                  backgroundImage: `url(${categoryIcons[c] || ""})`,
                }}
              >
                <span className="so-navitem__label">{c}</span>
              </Link>
            ))}
          </nav>
          <Link href="/cart" className="so-mobile-corner so-mobile-corner--home" aria-label="Cart">
            <span className="so-mobile-corner__icon so-mobile-corner__icon--cart" aria-hidden="true" />
          </Link>
          <Link href="/" className="so-mobile-corner so-mobile-corner--cart" aria-label="Home">
            <span className="so-mobile-corner__icon so-mobile-corner__icon--home" aria-hidden="true" />
          </Link>
          <div className="so-header__mobile-tools">
            <input
              className="so-header__search"
              type="search"
              placeholder="Search"
                aria-label="Search"
              />
              <Link href="/login" className="so-auth-icon" aria-label="Sign in">
                <span className="so-auth-icon__glyph" aria-hidden="true" />
              </Link>
            </div>
          </div>
        </div>
      </header>
      <button
        type="button"
        className={`so-header__pulltab so-header__pulltab--visible${
          isHidden ? " so-header__pulltab--hidden" : ""
        }${isShrunk ? " so-header__pulltab--shrunk" : ""}`}
        onClick={() => setIsHidden(false)}
        onTouchStart={handleTouchStart}
        onTouchEnd={handleTouchEnd}
        aria-label={isHidden ? "Show header" : "Hide header"}
      >
        <span className="so-header__pulltab-grip" />
      </button>
    </>
  );
}