import { RECIPES, INGREDIENTS, PRODUCTS } from '../data/catalog.js?v=9';
import { createIngredientCardController, getIngredientCardHTML } from '../ui/ingredientCard.js?v=20260417-116';

function escapeHtml(s) {
    return String(s)
        .replace(/&/g, '&')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;')
        .replace(/"/g, '&quot;');
}

const RD_THEME = Object.freeze({
    surface: '#393937',
    surfaceSoft: '#2f2f2d',
    surfaceActive: '#23221e',
    border: '#444442',
    borderSoft: '#56534f',
    borderStrong: '#787876',
    textPrimary: '#ddd6ca',
    textSecondary: '#d7d2c8',
    textMuted: '#9b978f',
});

function forceBg(bg) {
    return `background:${bg} !important; background-image:none !important; box-shadow:none !important;`;
}

function forceBgBorder(bg, border) {
    return `${forceBg(bg)} border:1px solid ${border} !important;`;
}

export function getRecipeDetailHTML() {
    return `
    <div id="recipe-detail-view" class="absolute inset-0 bg-[#2d2e2b] z-30 transition-all duration-300 ease-in-out translate-x-full opacity-0 pointer-events-none overflow-hidden" style="background:#2d2e2b !important; background-image:none !important;">
        <div class="absolute top-0 w-full p-3.5 flex justify-between z-40 mt-3">
            <button id="rd-back-btn" onclick="closeRecipeDetail()" class="w-9 h-9 rounded-full flex items-center justify-center transition-opacity opacity-95 hover:opacity-100" style="background:rgba(57,57,55,0.93) !important; backdrop-filter:none !important; box-shadow:0 4px 9px rgba(0,0,0,0.33) !important; color:#ddd6ca !important; transition:box-shadow 180ms ease, background-color 180ms ease, opacity 180ms ease;">
                <i class="fas fa-arrow-left text-[13px]"></i>
            </button>
            <button id="rd-add-to-planner-btn" class="h-9 px-3 rounded-full flex items-center justify-center gap-1.5 transition-opacity opacity-95 hover:opacity-100 text-[12px] font-semibold" style="background:rgba(57,57,55,0.93) !important; backdrop-filter:none !important; box-shadow:0 3px 8px rgba(0,0,0,0.28) !important; color:#ddd6ca !important; transition:box-shadow 180ms ease, background-color 180ms ease, opacity 180ms ease;">
                <i class="fas fa-calendar-plus text-[11px]"></i> Zaplanuj
            </button>
        </div>

        <div id="rd-scroll-container" class="absolute inset-0 z-10 overflow-y-auto no-scrollbar" style="overscroll-behavior-y:none;">
            <div id="rd-hero" class="h-[236px] w-full relative overflow-hidden" style="background:linear-gradient(180deg, #3a3937 0%, #23221e 100%) !important; will-change:height,opacity;">
                <img id="rd-hero-img" src="" alt="" class="w-full h-full object-cover hidden" style="will-change:transform;">
                <div class="absolute inset-0 pointer-events-none" style="background:linear-gradient(to bottom, rgba(45,46,43,0.1), rgba(45,46,43,0.4), rgba(45,46,43,0.92));"></div>
                <span id="rd-hero-label" class="absolute inset-0 z-10 flex items-center justify-center font-medium text-[15px]" style="color:#ddd6ca;"></span>
            </div>

            <div id="rd-content-body" class="bg-[#2d2e2b] rounded-t-3xl -mt-6 relative z-30 pt-6 min-h-screen" style="background:#2d2e2b !important; background-image:none !important; box-shadow:0 -8px 20px rgba(0,0,0,0.35) !important;">
                <div class="mb-3 px-5">
                    <div class="flex justify-between items-start mb-2.5">
                        <h1 id="rd-title" class="text-xl font-bold leading-tight" style="color:#ddd6ca;"></h1>
                    </div>
                </div>

                <div class="px-5 pt-2">
                    <h2 class="text-[11px] font-bold uppercase tracking-wider mb-3" style="color:${RD_THEME.textMuted};">Składniki</h2>
                    <div id="rd-tab-ingredients"></div>
                </div>

                <div class="px-5 pt-2" style="padding-bottom:calc(2.5rem + env(safe-area-inset-bottom));">
                    <div class="border-t my-4" style="border-color:${RD_THEME.border};"></div>
                    <h2 class="text-[11px] font-bold uppercase tracking-wider mb-3" style="color:${RD_THEME.textMuted};">Kroki</h2>
                    <div id="rd-tab-steps"></div>
                </div>
            </div>
        </div>
    </div>
    ${getIngredientCardHTML({ idBase: 'rd-ing-card' })}
    `;
}

/* ── state ─────────────────────────────────────────────── */

let currentRecipeId = null;
let currentMode = 'catalog';
let currentServings = 1;
let currentSubstitutions = {};
let currentExcludedIngredients = new Set();
let currentAmountOverrides = {};
let currentAddedIngredients = [];
let currentProductSelections = {};
let expandedAlternatives = new Set();
let ingredientCard = null;
let resetScrollState = null;

function isPlannedMode() {
    return currentMode === 'planned';
}

function getEffectiveIngredientId(originalId) {
    return currentSubstitutions[originalId] || originalId;
}

function clampServings(value) {
    return Math.max(1, Math.min(12, Number(value) || 1));
}

function cloneAddedIngredients(items) {
    if (!Array.isArray(items)) return [];
    return items
        .filter((item) => item && typeof item.ingredientId === 'string' && typeof item.amount === 'number' && typeof item.unit === 'string')
        .map((item) => ({ ingredientId: item.ingredientId, amount: item.amount, unit: item.unit }));
}

function getSelectedProduct(productId) {
    return productId && PRODUCTS[productId] ? PRODUCTS[productId] : null;
}

function getProductSelectionForIngredient(...ingredientIds) {
    for (const ingredientId of ingredientIds) {
        if (!ingredientId) continue;
        const productId = currentProductSelections[ingredientId];
        if (getSelectedProduct(productId)) return productId;
    }
    return null;
}

function buildVisibleIngredients(recipe) {
    if (!recipe) return [];

    const rows = [];

    for (const ing of recipe.ingredients) {
        const originalId = ing.ingredientId;
        if (currentExcludedIngredients.has(originalId)) continue;

        const effectiveId = getEffectiveIngredientId(originalId);
        const effectiveDef = INGREDIENTS[effectiveId];
        const productId = getProductSelectionForIngredient(effectiveId, originalId);
        rows.push({
            key: `recipe:${originalId}`,
            originalId,
            ingredientId: effectiveId,
            name: effectiveDef?.name || effectiveId,
            amount: (currentAmountOverrides[originalId] ?? ing.amount) * currentServings,
            unit: ing.unit,
            productId,
            productName: getSelectedProduct(productId)?.name || '',
            added: false,
            alternatives: Array.isArray(ing.alternatives) ? ing.alternatives : [],
        });
    }

    currentAddedIngredients.forEach((item, index) => {
        const def = INGREDIENTS[item.ingredientId];
        const productId = getProductSelectionForIngredient(item.ingredientId);
        rows.push({
            key: `added:${index}:${item.ingredientId}`,
            originalId: item.ingredientId,
            ingredientId: item.ingredientId,
            name: def?.name || item.ingredientId,
            amount: item.amount * currentServings,
            unit: item.unit,
            productId,
            productName: getSelectedProduct(productId)?.name || '',
            added: true,
            alternatives: [],
        });
    });

    return rows;
}

/* ── populate ──────────────────────────────────────────── */

function populateDetail(recipeId, options = {}) {
    const recipe = RECIPES[recipeId];
    if (!recipe) return;

    currentRecipeId = recipeId;
    currentMode = options.plannedEntry ? 'planned' : 'catalog';
    currentServings = clampServings(options.servings ?? options.plannedEntry?.servings ?? 1);
    currentSubstitutions = { ...(options.substitutions || options.plannedEntry?.substitutions || {}) };
    currentExcludedIngredients = new Set(options.excludedIngredients || options.plannedEntry?.excludedIngredients || []);
    currentAmountOverrides = { ...(options.amountOverrides || options.plannedEntry?.amountOverrides || {}) };
    currentAddedIngredients = cloneAddedIngredients(options.addedIngredients || options.plannedEntry?.addedIngredients);
    currentProductSelections = { ...(options.productSelections || options.plannedEntry?.productSelections || {}) };
    expandedAlternatives.clear();
    ingredientCard?.close();

    const heroImg = document.getElementById('rd-hero-img');
    const heroLabel = document.getElementById('rd-hero-label');
    if (recipe.image) {
        heroImg.src = recipe.image;
        heroImg.alt = recipe.title;
        heroImg.classList.remove('hidden');
        heroLabel.textContent = '';
    } else {
        heroImg.classList.add('hidden');
        heroImg.src = '';
        heroLabel.textContent = `Zdjęcie: ${recipe.title}`;
    }
    document.getElementById('rd-title').textContent = recipe.title;
    document.getElementById('rd-add-to-planner-btn')?.classList.toggle('hidden', isPlannedMode());

    renderIngredients(recipe);
    renderSteps(recipe);
    resetScrollState?.();
}

/* ── helpers ───────────────────────────────────────────── */

function nutritionForAmount(ingredientId, amount, unit, productIdOverride = null) {
    const def = INGREDIENTS[ingredientId];
    const productId = productIdOverride || getProductSelectionForIngredient(ingredientId);
    const product = getSelectedProduct(productId);
    const nutrition = product?.nutritionPer100g || def?.nutritionPer100g;
    if (!def || !nutrition) return null;
    let grams = amount;
    if ((unit === 'szt.' || unit === 'szt') && def.weightPerPiece) {
        grams = amount * def.weightPerPiece;
    }
    const f = grams / 100;
    return {
        kcal: Math.round(nutrition.kcal * f),
        protein: Math.round(nutrition.protein * f * 10) / 10,
        fat: Math.round(nutrition.fat * f * 10) / 10,
        carbs: Math.round(nutrition.carbs * f * 10) / 10,
    };
}

function fmtAmt(n) {
    return Number.isInteger(n) ? String(n) : String(parseFloat(n.toFixed(1)));
}

/* ── ingredients tab with inline nutrition + summary ───── */

function computeEffectiveNutritionTotals(recipe) {
    let kcal = 0, protein = 0, fat = 0, carbs = 0;
    for (const ing of buildVisibleIngredients(recipe)) {
        const n = nutritionForAmount(ing.ingredientId, ing.amount, ing.unit, ing.productId);
        if (n) {
            kcal += n.kcal;
            protein += n.protein;
            fat += n.fat;
            carbs += n.carbs;
        }
    }
    return {
        kcal: Math.round(kcal),
        protein: Math.round(protein * 10) / 10,
        fat: Math.round(fat * 10) / 10,
        carbs: Math.round(carbs * 10) / 10,
    };
}

function renderNutritionSummary(recipe) {
    const total = computeEffectiveNutritionTotals(recipe);
    const servingsHtml = isPlannedMode()
        ? `
            <div class="mt-3 flex items-center justify-between gap-3">
                <p class="text-[10px] font-bold text-gray-400 uppercase tracking-wider">Porcje</p>
                <p class="pr-1 text-[13px] font-semibold leading-none text-[#d7d2c8] tabular-nums">${currentServings}</p>
            </div>`
        : `
            <div class="mt-3 flex items-center justify-between gap-3">
                <p class="text-[10px] font-bold text-gray-400 uppercase tracking-wider">Porcje</p>
                <div class="flex h-[2rem] w-[5.25rem] shrink-0 items-center gap-0.5 rounded-full border px-0.5" style="background:#2f2f2d;border-color:#444442;box-shadow:0 2px 8px rgba(0,0,0,0.25);">
                    <button type="button" id="rd-serv-minus" class="shrink-0 w-7 h-full flex items-center justify-center rounded-full border-0 bg-transparent text-[#d7d2c8] transition-colors" aria-label="Zmniejsz liczbę porcji">
                        <i class="fas fa-minus text-[10px]"></i>
                    </button>
                    <span id="rd-servings" class="flex-1 h-full inline-flex items-center justify-center px-0.5 text-[12px] font-semibold leading-none text-[#d7d2c8] tabular-nums">${currentServings}</span>
                    <button type="button" id="rd-serv-plus" class="shrink-0 w-7 h-full flex items-center justify-center rounded-full border-0 bg-transparent text-[#d7d2c8] transition-colors" aria-label="Zwiększ liczbę porcji">
                        <i class="fas fa-plus text-[10px]"></i>
                    </button>
                </div>
            </div>`;

    return `
        <div class="mb-4">
            <div class="h-full pb-2 flex flex-col" style="background:#2d2e2b !important; background-image:none !important; box-shadow:none !important;">
                <p class="text-[10px] font-bold text-gray-400 uppercase tracking-wider mb-2">Wartości odżywcze</p>
                <div class="flex-1 flex items-center">
                    <div class="grid grid-cols-4 gap-1.5 w-full">
                        <div class="rounded-xl px-2 py-[0.5625rem] text-center" style="background:#393937;">
                            <p class="text-[15px] font-bold text-gray-100 tabular-nums leading-tight">${total.kcal}</p>
                            <p class="text-[9px] text-gray-500 font-medium">kcal</p>
                        </div>
                        <div class="rounded-xl px-2 py-[0.5625rem] text-center" style="background:#393937;">
                            <p class="text-[15px] font-bold text-blue-400 tabular-nums leading-tight">${total.protein}g</p>
                            <p class="text-[9px] text-gray-500 font-medium">białko</p>
                        </div>
                        <div class="rounded-xl px-2 py-[0.5625rem] text-center" style="background:#393937;">
                            <p class="text-[15px] font-bold text-amber-400 tabular-nums leading-tight">${total.fat}g</p>
                            <p class="text-[9px] text-gray-500 font-medium">tłuszcz</p>
                        </div>
                        <div class="rounded-xl px-2 py-[0.5625rem] text-center" style="background:#393937;">
                            <p class="text-[15px] font-bold text-orange-400 tabular-nums leading-tight">${total.carbs}g</p>
                            <p class="text-[9px] text-gray-500 font-medium">węglowodany</p>
                        </div>
                    </div>
                </div>
            </div>
            ${servingsHtml}
        </div>`;
}

function renderIngredients(recipe) {
    const container = document.getElementById('rd-tab-ingredients');
    if (!container) return;

    if (isPlannedMode()) {
        const items = buildVisibleIngredients(recipe);
        const rows = items.map((item) => {
            const rowClass = 'rd-ing-row rounded-xl px-3 py-3 w-full text-left cursor-pointer transition-colors active:scale-[0.99]';
            const rowStyle = 'background:#393937 !important; background-image:none !important; box-shadow:0 2px 8px rgba(0,0,0,0.25) !important; border:none !important;';
            const productBadge = item.productName
                ? `<div class="flex items-center gap-1 mt-0.5"><span class="text-[10px] text-emerald-400 truncate">${escapeHtml(item.productName)}</span></div>`
                : '';
            const addedMark = item.added
                ? '<span class="shrink-0 inline-flex items-center justify-center text-[#8f8b84]" title="Dodany składnik" aria-label="Dodany składnik"><i class="fas fa-plus text-[8px]"></i></span>'
                : '';
            return `<li>
                <button type="button" class="${rowClass}" style="${rowStyle}" data-rd-open-ingredient data-rd-ingredient-id="${escapeHtml(item.ingredientId)}" data-rd-product-id="${escapeHtml(item.productId || '')}">
                    <div class="flex items-center gap-2">
                        <div class="flex-1 min-w-0">
                            <div class="flex items-center gap-1.5">
                                <span class="text-[12px] font-semibold text-gray-900 truncate block">${escapeHtml(item.name)}</span>
                                ${addedMark}
                            </div>
                            ${productBadge}
                        </div>
                        <div class="shrink-0 flex items-center gap-1 px-2 py-1 rounded-lg">
                            <span class="text-[12px] font-semibold text-gray-900 tabular-nums">${fmtAmt(item.amount)}</span>
                            <span class="text-[11px] text-gray-500">${escapeHtml(item.unit)}</span>
                        </div>
                    </div>
                </button>
            </li>`;
        }).join('');

        container.innerHTML = `
            ${renderNutritionSummary(recipe)}
            ${rows
        ? `<ul class="space-y-1.5" id="rd-ingredient-list">${rows}</ul>`
        : `<p class="text-sm text-center py-8" style="color:${RD_THEME.textMuted};">Brak składników w tej wersji przepisu.</p>`}`;

        container.querySelectorAll('[data-rd-open-ingredient]').forEach((btn) => {
            btn.addEventListener('click', () => {
                const ingredientId = btn.dataset.rdIngredientId;
                if (!ingredientId || !ingredientCard) return;
                const productId = btn.dataset.rdProductId || null;
                ingredientCard.open({
                    ingredientId,
                    productId,
                    selectedProductId: productId,
                    allowProductSelection: false,
                    sourceNote: 'Z planera',
                });
            });
        });
        return;
    }

    const rows = recipe.ingredients.map((ing) => {
        const origId = ing.ingredientId;
        const hasAlts = ing.alternatives && ing.alternatives.length > 0;
        const effectiveId = hasAlts ? getEffectiveIngredientId(origId) : origId;
        const effectiveDef = INGREDIENTS[effectiveId];
        const effectiveName = effectiveDef?.name || effectiveId;
        const scaledAmount = ing.amount * currentServings;
        const isExpanded = expandedAlternatives.has(origId);
        const rowClass = 'rd-ing-row rounded-xl px-3 py-3';
        const rowStyle = 'background:#393937 !important; background-image:none !important; box-shadow:0 2px 8px rgba(0,0,0,0.25) !important; border:none !important;';

        const toggleBtn = hasAlts
            ? `<button type="button" class="rd-alt-toggle shrink-0 w-5 h-5 flex items-center justify-center transition-colors text-gray-400 hover:text-gray-300" style="background:transparent !important; box-shadow:none !important;" data-original-id="${escapeHtml(origId)}" aria-label="Wybierz zamiennik składnika"><i class="fas fa-shuffle text-[10px]"></i></button>`
            : '';

        let rowHtml = `<div class="${rowClass}" style="${rowStyle}" data-original-id="${escapeHtml(origId)}">`;
        rowHtml += '<div class="flex items-center gap-2">';
        rowHtml += `<div class="flex-1 min-w-0"><span class="text-[12px] font-semibold text-gray-900 truncate block">${escapeHtml(effectiveName)}</span></div>`;
        rowHtml += '<div class="shrink-0 flex items-center gap-2">';
        rowHtml += toggleBtn;
        rowHtml += `<div class="shrink-0 flex items-center gap-1 px-2 py-1 rounded-lg">
            <span class="text-[12px] font-semibold text-gray-900 tabular-nums">${fmtAmt(scaledAmount)}</span>
            <span class="text-[11px] text-gray-500">${escapeHtml(ing.unit)}</span>
        </div>`;
        rowHtml += '</div>';
        rowHtml += '</div>';

        let altListHtml = '';
        if (hasAlts && isExpanded) {
            const allOptions = [origId, ...ing.alternatives];
            const optionCards = allOptions.map((altId) => {
                const def = INGREDIENTS[altId];
                const altName = def?.name || altId;
                const isSelected = effectiveId === altId;
                const altNutrition = nutritionForAmount(altId, scaledAmount, ing.unit);
                const checkbox = `
                    <span class="ml-auto self-center w-[18px] h-[18px] rounded-full shrink-0 flex items-center justify-center"
                          style="border:1.5px solid #56534f; background:transparent;">
                        ${isSelected ? '<i class="fas fa-check" style="color:#9b978f; font-size:8px; line-height:1; display:block; transform:translateY(0.5px);"></i>' : ''}
                    </span>`;
                const nutritionLine = altNutrition
                    ? `<div class="text-[10px] text-gray-400 mt-0.5 tabular-nums">${altNutrition.kcal} kcal · ${altNutrition.protein}g B · ${altNutrition.fat}g T · ${altNutrition.carbs}g W</div>`
                    : '';

                return `<button type="button" class="rd-alt-pick w-full text-left p-2.5 rounded-lg transition-all" style="background:#2f2f2d !important; background-image:none !important; border:none !important; box-shadow:none !important;" data-original-id="${escapeHtml(origId)}" data-alt-id="${escapeHtml(altId)}"><div class="flex items-center gap-3"><div class="min-w-0 flex-1"><div class="text-[11px] font-semibold text-gray-900">${escapeHtml(altName)}</div>${nutritionLine}</div>${checkbox}</div></button>`;
            });
            altListHtml = `
            <div class="mt-2 ml-1 space-y-1 rd-alt-options" data-original-id="${escapeHtml(origId)}">
                ${optionCards.join('')}
            </div>`;
        }

        rowHtml += altListHtml;
        rowHtml += '</div>';
        return `<li>${rowHtml}</li>`;
    }).join('');

    container.innerHTML = `
        ${renderNutritionSummary(recipe)}
        <ul class="space-y-1.5" id="rd-ingredient-list">${rows}</ul>`;

    container.querySelector('#rd-serv-minus')?.addEventListener('click', () => {
        if (currentServings <= 1) return;
        currentServings--;
        renderIngredients(recipe);
    });

    container.querySelector('#rd-serv-plus')?.addEventListener('click', () => {
        if (currentServings >= 12) return;
        currentServings++;
        renderIngredients(recipe);
    });

    container.querySelectorAll('.rd-alt-toggle').forEach((btn) => {
        btn.addEventListener('click', () => {
            const origId = btn.dataset.originalId;
            if (expandedAlternatives.has(origId)) {
                expandedAlternatives.delete(origId);
            } else {
                expandedAlternatives.add(origId);
            }
            renderIngredients(recipe);
        });
    });

    container.querySelectorAll('.rd-alt-options').forEach((group) => {
        group.querySelectorAll('[data-alt-id]').forEach((card) => {
            card.addEventListener('click', () => {
                const originalId = card.dataset.originalId;
                const altId = card.dataset.altId;
                if (altId === originalId) {
                    delete currentSubstitutions[originalId];
                } else {
                    currentSubstitutions[originalId] = altId;
                }
                expandedAlternatives.delete(originalId);
                renderIngredients(recipe);
            });
        });
    });
}

/* ── steps tab ─────────────────────────────────────────── */

function renderSteps(recipe) {
    const container = document.getElementById('rd-tab-steps');
    if (!container) return;

    const steps = recipe.steps || [];
    if (steps.length === 0) {
        container.innerHTML = `<p class="text-sm text-center py-8" style="color:${RD_THEME.textMuted};">Brak kroków przygotowania.</p>`;
        return;
    }

    container.innerHTML = `
        <div class="space-y-0.5 pb-5">
            ${steps.map((step, i) => `
            <div class="relative rounded-xl py-2 pl-3 pr-3" style="background:transparent !important; background-image:none !important; box-shadow:none !important; border:none !important;">
                <div class="absolute top-2 left-0 w-3 h-6 flex items-center justify-start text-[11px] font-bold shrink-0 tabular-nums" style="background:transparent !important; border:none !important; box-shadow:none !important; color:${RD_THEME.textSecondary} !important;">${i + 1}.</div>
                <p class="pl-4 text-[13px] leading-relaxed" style="color:${RD_THEME.textSecondary};">${escapeHtml(step)}</p>
            </div>`).join('')}
        </div>`;
}

/* ── setup ─────────────────────────────────────────────── */

export function setupRecipeDetail() {
    ingredientCard = createIngredientCardController({ idBase: 'rd-ing-card', defaultSourceNote: 'Z planera' });
    ingredientCard.bind();

    /* ── collapsing hero on scroll ─────────────── */

    const HERO_MAX = 236;
    const scrollContainer = document.getElementById('rd-scroll-container');
    const hero = document.getElementById('rd-hero');
    const heroImg = document.getElementById('rd-hero-img');
    const topActionButtons = [
        document.getElementById('rd-back-btn'),
        document.getElementById('rd-add-to-planner-btn'),
    ].filter(Boolean);

    function syncTopActionButtons(progress) {
        const shadowY = 3 + (progress * 3);
        const shadowBlur = 8 + (progress * 6);
        const shadowAlpha = 0.28 + (progress * 0.16);
        const backgroundAlpha = 0.93 + (progress * 0.05);
        topActionButtons.forEach((button) => {
            const isRoundButton = button.id === 'rd-back-btn';
            const effectiveShadowY = isRoundButton ? shadowY + 1 : shadowY;
            const effectiveShadowBlur = isRoundButton ? shadowBlur + 1 : shadowBlur;
            const effectiveShadowAlpha = isRoundButton ? shadowAlpha + 0.05 : shadowAlpha;
            button.style.boxShadow = `0 ${effectiveShadowY}px ${effectiveShadowBlur}px rgba(0,0,0,${effectiveShadowAlpha})`;
            button.style.background = `rgba(57,57,55,${backgroundAlpha})`;
        });
    }

    if (scrollContainer && hero) {
        let ticking = false;
        let lastTouchY = null;
        scrollContainer.addEventListener('scroll', () => {
            if (ticking) return;
            ticking = true;
            requestAnimationFrame(() => {
                const scrollY = Math.max(0, scrollContainer.scrollTop);
                const collapse = Math.min(scrollY, HERO_MAX);
                const progress = collapse / HERO_MAX;
                hero.style.height = `${HERO_MAX - collapse}px`;
                hero.style.opacity = String(Math.max(0, 1 - collapse / HERO_MAX));
                syncTopActionButtons(progress);
                if (heroImg) {
                    heroImg.style.transform = `translateY(${collapse * 0.4}px) scale(${1 + collapse * 0.001})`;
                }
                ticking = false;
            });
        });

        scrollContainer.addEventListener('touchstart', (e) => {
            lastTouchY = e.touches[0]?.clientY ?? null;
        }, { passive: true });

        scrollContainer.addEventListener('touchmove', (e) => {
            const touchY = e.touches[0]?.clientY;
            if (touchY == null) return;
            if (scrollContainer.scrollTop <= 0 && lastTouchY != null && touchY > lastTouchY) {
                e.preventDefault();
            }
            lastTouchY = touchY;
        }, { passive: false });

        scrollContainer.addEventListener('touchend', () => {
            lastTouchY = null;
        }, { passive: true });

        scrollContainer.addEventListener('touchcancel', () => {
            lastTouchY = null;
        }, { passive: true });
    }

    resetScrollState = () => {
        if (scrollContainer) scrollContainer.scrollTop = 0;
        if (hero) { hero.style.height = `${HERO_MAX}px`; hero.style.opacity = '1'; }
        syncTopActionButtons(0);
        if (heroImg) heroImg.style.transform = '';
    };

    /* ── planner — delegate to MealPlanEditor ─────── */

    document.getElementById('rd-add-to-planner-btn')?.addEventListener('click', () => {
        if (!currentRecipeId || isPlannedMode()) return;
        window.openMealPlanEditor?.({
            mode: 'add',
            recipeId: currentRecipeId,
            servings: currentServings,
            substitutions: { ...currentSubstitutions },
        });
    });

    window.openRecipeDetail = (recipeId, options = {}) => {
        if (!recipeId || !RECIPES[recipeId]) return;
        populateDetail(recipeId, options);
        const view = document.getElementById('recipe-detail-view');
        view.classList.remove('translate-x-full', 'opacity-0', 'pointer-events-none');
        view.classList.add('translate-x-0', 'opacity-100', 'pointer-events-auto');
    };

    window.closeRecipeDetail = () => {
        ingredientCard?.close();
        window.closeMealPlanEditor?.();
        const view = document.getElementById('recipe-detail-view');
        view.classList.remove('translate-x-0', 'opacity-100', 'pointer-events-auto');
        view.classList.add('translate-x-full', 'opacity-0', 'pointer-events-none');
    };
}