/**
 * honeyDue landing — minimal progressive enhancement.
 * - Mobile nav toggle
 * - Nav background on scroll
 * - Reveal-on-scroll via IntersectionObserver
 * - Smooth scroll for anchor links (offset for sticky nav)
 * - Comb completion-grid generator
 * - Respects prefers-reduced-motion
 */

(function () {
    'use strict';

    var prefersReducedMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;

    document.addEventListener('DOMContentLoaded', function () {
        initMobileNav();
        initScrollNav();
        initSmoothScroll();
        initReveal();
        initCombGrid();
    });

    /* ---------- Mobile navigation ---------- */
    function initMobileNav() {
        var toggle = document.getElementById('nav-toggle');
        var links = document.getElementById('nav-links');
        if (!toggle || !links) return;

        toggle.addEventListener('click', function () {
            var isOpen = links.classList.toggle('is-open');
            toggle.classList.toggle('is-active', isOpen);
            toggle.setAttribute('aria-expanded', isOpen ? 'true' : 'false');
        });

        // Close menu when a nav link is tapped
        links.querySelectorAll('.nav-link').forEach(function (link) {
            link.addEventListener('click', function () {
                links.classList.remove('is-open');
                toggle.classList.remove('is-active');
                toggle.setAttribute('aria-expanded', 'false');
            });
        });
    }

    /* ---------- Sticky nav scroll state ---------- */
    function initScrollNav() {
        var nav = document.getElementById('nav');
        if (!nav) return;

        var ticking = false;
        function update() {
            nav.classList.toggle('is-scrolled', window.pageYOffset > 16);
            ticking = false;
        }
        window.addEventListener('scroll', function () {
            if (!ticking) {
                window.requestAnimationFrame(update);
                ticking = true;
            }
        }, { passive: true });
        update();
    }

    /* ---------- Smooth scroll with sticky-nav offset ---------- */
    function initSmoothScroll() {
        document.querySelectorAll('a[href^="#"]').forEach(function (anchor) {
            anchor.addEventListener('click', function (e) {
                var href = anchor.getAttribute('href');
                if (!href || href === '#' || href.length < 2) return;

                var target = document.querySelector(href);
                if (!target) return;

                e.preventDefault();
                var nav = document.querySelector('.nav');
                var navHeight = nav ? nav.offsetHeight : 0;
                var top = target.getBoundingClientRect().top + window.pageYOffset - navHeight - 8;

                window.scrollTo({
                    top: top,
                    behavior: prefersReducedMotion ? 'auto' : 'smooth'
                });
            });
        });
    }

    /* ---------- Reveal-on-scroll ---------- */
    function initReveal() {
        var elements = document.querySelectorAll('.reveal');
        if (!elements.length) return;

        if (prefersReducedMotion || !('IntersectionObserver' in window)) {
            elements.forEach(function (el) { el.classList.add('is-visible'); });
            return;
        }

        var io = new IntersectionObserver(function (entries) {
            entries.forEach(function (entry) {
                if (entry.isIntersecting) {
                    entry.target.classList.add('is-visible');
                    io.unobserve(entry.target);
                }
            });
        }, {
            threshold: 0.12,
            rootMargin: '0px 0px -10% 0px'
        });

        elements.forEach(function (el) { io.observe(el); });
    }

    /* ---------- Completion-grid (the comb) ----------
       Generates a deterministic honeycomb of cells, more filled near
       the top, fading toward the bottom — visualizes "your hive
       fills across the season". Eight columns, ~80 cells. */
    function initCombGrid() {
        var grid = document.getElementById('combGrid');
        if (!grid) return;

        var cols = 8;
        var rows = 10;
        var total = cols * rows;

        // Deterministic "filled" pattern — top rows almost all filled,
        // middle rows half, bottom rows mostly empty with a few faint.
        // Seeded by row+col so it's stable across renders.
        for (var i = 0; i < total; i++) {
            var row = Math.floor(i / cols);
            var col = i % cols;
            var cell = document.createElement('div');
            cell.className = 'comb-cell';

            // Row weight 0..1 (1 = all filled, 0 = none)
            var w = 1 - (row / (rows - 1));
            // Add small deterministic variance based on (row * 13 + col * 7) % 11
            var noise = ((row * 13 + col * 7) % 11) / 11;
            var fillScore = w * 0.85 + (1 - noise) * 0.15;

            if (fillScore > 0.7) {
                cell.classList.add('is-filled');
            } else if (fillScore > 0.42) {
                cell.classList.add('is-faint');
            }
            grid.appendChild(cell);
        }
    }
})();