"use client";

import {usePathname} from "next/navigation";
import Link from "next/link";
import React, {useContext, useEffect, useState} from "react";
import {HiBars3BottomRight} from "react-icons/hi2";
import {ThemeContext} from "@/components/provider/ThemeProvider";
import {useThemeColors} from "@/utils/useThemeColors";
import {navLinks} from "@/constant/Constant";

type Props = {
    openNav: () => void;
};

const Nav = ({openNav}: Props) => {
    const [navBg, setNavBg] = useState(false);
    const [navHeight, setNavHeight] = useState("h-[10vh]");
    const [contentSize, setContentSize] = useState("text-base md:text-lg");
    const [buttonSize, setButtonSize] = useState("md:px-6 md:py-2 px-4 py-1 text-sm");

    const {theme, toggleTheme} = useContext(ThemeContext);
    const colors = useThemeColors();
    const pathname = usePathname();

    const navColorClass = theme === "dark" || !navBg ? "text-white" : "text-black";

    useEffect(() => {
        const handler = () => {
            if (window.scrollY >= 90) {
                setNavBg(true);
                setNavHeight("h-[8vh]");
                setContentSize("text-sm md:text-base");
                setButtonSize("md:px-5 md:py-1.5 px-3 py-1 text-xs");
            } else {
                setNavBg(false);
                setNavHeight("h-[10vh]");
                setContentSize("text-base md:text-lg");
                setButtonSize("md:px-6 md:py-2 px-4 py-1 text-sm");
            }
        };

        window.addEventListener("scroll", handler);
        return () => window.removeEventListener("scroll", handler);
    }, []);

    return (
        <div
            className={`fixed w-full transition-all duration-300 ease-in-out ${navHeight} z-[1000] ${
                navBg ? "shadow-md" : ""
            }`}
            style={{backgroundColor: navBg ? colors.navBg : "transparent"}}
        >
            <div className="flex items-center h-full justify-between w-[90%] xl:w-[80%] mx-auto">
                <Link href="/">
                    <h1 className={`${contentSize} font-bold cursor-pointer ${navColorClass}`}>
                        <span className="text-lg md:text-xl text-pink-700">R</span>hein Software
                    </h1>
                </Link>

                <div className="hidden lg:flex items-center space-x-6">
                    {navLinks.map((link) => (
                        <Link href={link.url} key={link.id}>
                            <p className={`relative group ${contentSize} uppercase ${getNavLinkClasses(pathname === link.url, navBg, theme, navColorClass)}`}>
                                {link.label}
                                {pathname !== link.url && (
                                    <span
                                        className="absolute bottom-0 left-0 w-full h-[2px] bg-current transform transition-transform duration-300 origin-right scale-x-0 group-hover:scale-x-100"/>
                                )}
                            </p>
                        </Link>
                    ))}
                </div>

                <div className="flex items-center space-x-3">
                    <Link href="/contact">
                        <button
                            className={`${buttonSize} text-white font-semibold bg-blue-700 hover:bg-blue-900 rounded-full`}>
                            Kontakt
                        </button>
                    </Link>

                    <button
                        onClick={toggleTheme}
                        className={`w-7 h-7 flex items-center justify-center rounded-full ${navColorClass}`}
                        style={{backgroundColor: colors.secondaryBg}}
                    >
                        {theme === "dark" ? "🌙" : "☀️"}
                    </button>
                    <HiBars3BottomRight
                        onClick={openNav}
                        className={`w-6 h-6 cursor-pointer lg:hidden ${navColorClass}`}
                    />
                </div>
            </div>
        </div>
    );
};

const getNavLinkClasses = (
    isActive: boolean,
    navBg: boolean,
    theme: string,
    navColorClass: string
): string => {
    if (isActive) return !navBg ? "text-white font-bold" : `${navColorClass} font-bold`;
    if (!navBg) return "text-white font-medium";
    return theme === "dark" ? "text-gray-300 font-medium" : "text-gray-700 font-medium";
};

export default Nav;