import { INGREDIENTS, RECIPES } from '../data/catalog.js';
import { MEAL_SLOTS } from '../planner/mealSlots.js';
import {
    addDays,
    addMonths,
    sameDay,
    sameMonth,
    startOfDay,
    startOfMonth,
    startOfWeekMonday,
} from '../services/dateUtils.js';
import {
    dateKey,
    loadPlans,
    newPlanEntryId,
    savePlans,
} from '../services/planStore.js';
import { showAppToast } from './toast.js';

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

const MONTHS_LONG = ['Styczeń', 'Luty', 'Marzec', 'Kwiecień', 'Maj', 'Czerwiec', 'Lipiec', 'Sierpień', 'Wrzesień', 'Październik', 'Listopad', 'Grudzień'];
const MONTHS_SHORT = ['sty', 'lut', 'mar', 'kwi', 'maj', 'cze', 'lip', 'sie', 'wrz', 'paź', 'lis', 'gru'];
const WEEKDAYS_SHORT = ['Pn', 'Wt', 'Śr', 'Cz', 'Pt', 'So', 'Nd'];
const WEEKDAYS_LONG = ['Niedziela', 'Poniedziałek', 'Wtorek', 'Środa', 'Czwartek', 'Piątek', 'Sobota'];
const slotLabel = Object.fromEntries(MEAL_SLOTS.map((s) => [s.id, s.label]));

/* ── HTML template ──────────────────────────────────── */

export function getMealPlanEditorHTML() {
    return `
    <div id="mpe-overlay" class="absolute inset-0 z-[55] bg-black/45 hidden flex items-end" style="pointer-events:none">
        <div id="mpe-sheet" class="w-full bg-white rounded-t-3xl shadow-lg flex flex-col" style="pointer-events:auto; max-height:95vh; transform:translateY(100%); transition:transform 300ms cubic-bezier(0.32,0.72,0,1)">
            <div class="shrink-0 px-5 pt-3 pb-2.5 border-b border-gray-100">
                <div class="w-10 h-1 bg-gray-200 rounded-full mx-auto mb-3"></div>
                <div class="flex items-center justify-between">
                    <div class="min-w-0 flex-1">
                        <h2 id="mpe-title" class="text-[15px] font-bold text-gray-900 leading-tight"></h2>
                        <p id="mpe-subtitle" class="text-[11px] text-gray-500 mt-0.5 truncate"></p>
                    </div>
                    <button id="mpe-close-btn" type="button" class="shrink-0 w-8 h-8 rounded-full border border-gray-200 flex items-center justify-center text-gray-400 hover:text-gray-900 hover:bg-gray-50 transition-colors ml-3">
                        <i class="fas fa-times text-xs"></i>
                    </button>
                </div>
            </div>
            <div id="mpe-body" class="flex-1 min-h-0 overflow-y-auto no-scrollbar px-5 py-3">
                <div id="mpe-cal-section" class="hidden mb-4">
                    <div class="flex items-center gap-1 mb-2">
                        <button id="mpe-cal-prev" type="button" class="shrink-0 w-8 h-8 flex items-center justify-center rounded-full border border-gray-200 text-gray-700 hover:bg-gray-50 transition-colors"><i class="fas fa-chevron-left text-xs"></i></button>
                        <p id="mpe-cal-title" class="flex-1 min-w-0 text-xs font-medium text-gray-900 text-center tabular-nums leading-none px-1 truncate"></p>
                        <button id="mpe-cal-next" type="button" class="shrink-0 w-8 h-8 flex items-center justify-center rounded-full border border-gray-200 text-gray-700 hover:bg-gray-50 transition-colors"><i class="fas fa-chevron-right text-xs"></i></button>
                    </div>
                    <div class="flex items-center justify-center mb-2">
                        <button id="mpe-cal-today" type="button" class="h-6 shrink-0 inline-flex items-center justify-center gap-1 rounded-md border border-gray-200 bg-white px-2.5 text-[10px] font-semibold text-gray-700 shadow-sm hover:bg-gray-50 hover:text-gray-900 transition-colors hidden"><i class="fas fa-calendar-day text-[9px] opacity-70"></i> Dziś</button>
                    </div>
                    <div class="grid grid-cols-7 gap-0.5 text-center text-[9px] font-medium text-gray-400 uppercase tracking-wide mb-0.5 leading-none">${WEEKDAYS_SHORT.map((d) => `<div>${d}</div>`).join('')}</div>
                    <div id="mpe-cal-grid" class="grid grid-cols-7 gap-0.5"></div>
                    <button id="mpe-cal-toggle" type="button" class="w-full flex items-center justify-center py-1 mt-1 text-gray-400 hover:text-gray-600 transition-colors"><i id="mpe-cal-toggle-icon" class="fas fa-chevron-down text-[10px]"></i></button>
                    <p class="text-[10px] font-bold text-gray-400 uppercase tracking-wider mt-3 mb-2">Pora posiłku</p>
                    <div id="mpe-slot-chips" class="flex flex-wrap gap-1.5"></div>
                </div>
                <div id="mpe-servings-row" class="flex items-center justify-between mb-4"></div>
                <div id="mpe-ing-section" class="mb-4">
                    <p class="text-[10px] font-bold text-gray-400 uppercase tracking-wider mb-2">Składniki</p>
                    <div id="mpe-ing-list" class="space-y-1.5"></div>
                    <div id="mpe-add-area" class="mt-2"></div>
                </div>
                <div id="mpe-nutrition-section"></div>
            </div>
            <div class="shrink-0 px-5 pb-8 pt-3 border-t border-gray-100">
                <button id="mpe-confirm-btn" type="button" class="w-full bg-gray-900 hover:bg-black text-white py-3 rounded-xl font-semibold text-[13px] transition-colors flex items-center justify-center gap-2">
                    <i class="fas fa-check text-xs"></i> <span id="mpe-confirm-label">Dodaj do planu</span>
                </button>
            </div>
        </div>
    </div>`;
}

/* ── Setup ──────────────────────────────────────────── */

export function setupMealPlanEditor() {
    const overlay = document.getElementById('mpe-overlay');
    const sheet = document.getElementById('mpe-sheet');
    if (!overlay || !sheet) return;

    const S = {
        mode: null,
        recipeId: null,
        date: null,
        slotId: null,
        servings: 1,
        subs: {},
        excluded: new Set(),
        overrides: {},
        added: [],
        entryId: null,
        showCal: false,
        calDate: null,
        calExpanded: false,
        altOpen: new Set(),
        addOpen: false,
        addQuery: '',
    };

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

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

    function totalNutrition() {
        const r = RECIPES[S.recipeId];
        if (!r) return { kcal: 0, protein: 0, fat: 0, carbs: 0 };
        let kcal = 0, protein = 0, fat = 0, carbs = 0;
        for (const ing of r.ingredients) {
            if (S.excluded.has(ing.ingredientId)) continue;
            const eid = S.subs[ing.ingredientId] || ing.ingredientId;
            const base = S.overrides[ing.ingredientId] ?? ing.amount;
            const n = nutFor(eid, base * S.servings, ing.unit);
            if (n) { kcal += n.kcal; protein += n.protein; fat += n.fat; carbs += n.carbs; }
        }
        for (const a of S.added) {
            const n = nutFor(a.ingredientId, a.amount * S.servings, a.unit);
            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 fmtAmt(n) { return Number.isInteger(n) ? String(n) : String(parseFloat(n.toFixed(1))); }

    /* ── Calendar ──────────────────────────────────── */

    function calCell(d, today, month) {
        const sel = S.date && sameDay(d, S.date);
        const past = d.getTime() < today.getTime();
        const other = d.getMonth() !== month;
        let cls = 'flex flex-col items-center justify-center rounded-md text-xs font-medium transition-colors w-full min-h-10 py-1 gap-0.5 leading-tight ';
        if (sel) cls += 'bg-gray-900 text-white ';
        else if (past || other) cls += 'text-gray-300 ';
        else cls += 'text-gray-800 hover:bg-gray-100 ';
        if (!sel && !past && !other && sameDay(d, today)) cls += 'ring-1 ring-inset ring-gray-900 ';
        const inner = `<span>${d.getDate()}</span><span class="w-1 h-1"></span>`;
        return (past && !sel) ? `<div class="${cls}">${inner}</div>` : `<button type="button" class="mpe-cal-day ${cls}" data-ts="${d.getTime()}">${inner}</button>`;
    }

    function renderCal() {
        const sec = document.getElementById('mpe-cal-section');
        if (!sec || !S.showCal) { sec?.classList.add('hidden'); return; }
        sec.classList.remove('hidden');
        const grid = document.getElementById('mpe-cal-grid');
        const title = document.getElementById('mpe-cal-title');
        const todayBtn = document.getElementById('mpe-cal-today');
        const icon = document.getElementById('mpe-cal-toggle-icon');
        if (!grid || !title) return;
        const today = startOfDay(new Date());

        if (S.calExpanded) {
            const ms = startOfMonth(S.calDate);
            title.textContent = `${MONTHS_LONG[ms.getMonth()]} ${ms.getFullYear()}`;
            icon.className = 'fas fa-chevron-up text-[10px]';
            const first = startOfWeekMonday(ms);
            const cells = [];
            let d = new Date(first);
            for (let i = 0; i < 42; i++) { cells.push(new Date(d)); d = addDays(d, 1); }
            while (cells.length > 7 && cells.slice(-7).every((c) => c.getMonth() !== ms.getMonth())) cells.splice(-7);
            grid.innerHTML = cells.map((c) => calCell(c, today, ms.getMonth())).join('');
            todayBtn?.classList.toggle('hidden', sameMonth(today, S.calDate));
        } else {
            const ws = startOfWeekMonday(S.calDate);
            title.textContent = `${MONTHS_LONG[S.calDate.getMonth()]} ${S.calDate.getFullYear()}`;
            icon.className = 'fas fa-chevron-down text-[10px]';
            const cells = [];
            for (let i = 0; i < 7; i++) cells.push(addDays(ws, i));
            grid.innerHTML = cells.map((c) => calCell(c, today, S.calDate.getMonth())).join('');
            todayBtn?.classList.toggle('hidden', sameDay(startOfWeekMonday(today), ws));
        }

        grid.querySelectorAll('.mpe-cal-day').forEach((btn) => {
            btn.addEventListener('click', () => {
                S.date = new Date(Number(btn.dataset.ts));
                S.calDate = new Date(S.date);
                renderCal();
            });
        });
    }

    function renderSlots() {
        const el = document.getElementById('mpe-slot-chips');
        if (!el || !S.showCal) return;
        const r = RECIPES[S.recipeId];
        if (!r) return;
        el.innerHTML = MEAL_SLOTS.filter((s) => r.allowedSlots.includes(s.id)).map((s) => {
            const sel = s.id === S.slotId;
            return `<button type="button" class="mpe-slot-btn px-3 py-1.5 rounded-lg border text-[12px] font-semibold transition-all ${sel ? 'border-gray-900 bg-gray-900 text-white' : 'border-gray-200 bg-gray-50 text-gray-700 hover:border-gray-400'}" data-slot-id="${s.id}">${esc(s.label)}</button>`;
        }).join('');
    }

    /* ── Servings ──────────────────────────────────── */

    function renderServings() {
        const el = document.getElementById('mpe-servings-row');
        if (!el) return;
        el.innerHTML = `
            <span class="text-[13px] font-semibold text-gray-900">Porcje</span>
            <div class="flex items-center gap-0.5 bg-gray-100 p-0.5 rounded-lg">
                <button type="button" id="mpe-serv-minus" class="w-7 h-7 bg-white rounded-md shadow-sm flex items-center justify-center text-gray-600 hover:text-black hover:bg-gray-50"><i class="fas fa-minus text-[9px]"></i></button>
                <span id="mpe-serv-count" class="font-bold text-gray-900 text-[13px] w-5 text-center tabular-nums">${S.servings}</span>
                <button type="button" id="mpe-serv-plus" class="w-7 h-7 bg-white rounded-md shadow-sm flex items-center justify-center text-gray-600 hover:text-black hover:bg-gray-50"><i class="fas fa-plus text-[9px]"></i></button>
            </div>`;
    }

    /* ── Ingredients list ──────────────────────────── */

    function renderIngList() {
        const list = document.getElementById('mpe-ing-list');
        if (!list) return;
        const r = RECIPES[S.recipeId];
        if (!r) return;
        let html = '';

        for (const ing of r.ingredients) {
            const id = ing.ingredientId;
            const excl = S.excluded.has(id);
            const eid = S.subs[id] || id;
            const eDef = INGREDIENTS[eid];
            const eName = eDef?.name || eid;
            const hasAlts = ing.alternatives?.length > 0;
            const swapped = eid !== id;
            const altOpen = S.altOpen.has(id);
            const base = S.overrides[id] ?? ing.amount;
            const disp = base * S.servings;
            const modified = id in S.overrides;

            const checkCls = excl
                ? 'w-5 h-5 rounded-md border-2 border-gray-300 bg-white'
                : 'w-5 h-5 rounded-md border-2 border-gray-900 bg-gray-900';
            const checkIco = excl ? '' : '<i class="fas fa-check text-white text-[8px]"></i>';
            const rowBorder = excl ? 'border-gray-100' : swapped ? 'border-amber-200' : 'border-gray-200';
            const rowBg = excl ? 'bg-gray-50/50' : swapped ? 'bg-amber-50/30' : 'bg-white';
            const rowOp = excl ? 'opacity-50' : '';
            const nameCls = excl ? 'text-[12px] font-semibold text-gray-400 line-through' : 'text-[12px] font-semibold text-gray-900';
            const amtCls = excl ? 'text-gray-300' : 'text-gray-900';
            const unitCls = excl ? 'text-gray-300' : 'text-gray-500';

            const shuffleBtn = hasAlts && !excl
                ? `<button type="button" class="mpe-shuffle shrink-0 w-5 h-5 rounded-full ${swapped ? 'bg-amber-50 text-amber-500' : 'bg-gray-100 text-gray-400 hover:bg-gray-200'} flex items-center justify-center transition-colors" data-orig-id="${esc(id)}"><i class="fas fa-shuffle text-[8px]"></i></button>`
                : '';
            const modDot = modified && !excl ? '<span class="w-1.5 h-1.5 rounded-full bg-amber-400 shrink-0"></span>' : '';

            html += `<div class="mpe-ing-row rounded-xl border ${rowBorder} ${rowBg} ${rowOp} p-2.5" data-orig-id="${esc(id)}" data-type="recipe">`;
            html += `<div class="flex items-center gap-2.5">`;
            html += `<button type="button" class="mpe-toggle ${checkCls} flex items-center justify-center shrink-0" data-orig-id="${esc(id)}">${checkIco}</button>`;
            html += `<div class="flex-1 min-w-0 flex items-center gap-1.5"><span class="${nameCls} truncate">${esc(eName)}</span>${shuffleBtn}</div>`;
            html += `<button type="button" class="mpe-edit-amt shrink-0 flex items-center gap-1 px-2 py-1 rounded-lg ${excl ? '' : 'hover:bg-gray-100'} transition-colors" data-orig-id="${esc(id)}" data-type="recipe" ${excl ? 'disabled' : ''}>`;
            html += `${modDot}<span class="text-[12px] font-semibold ${amtCls} tabular-nums">${fmtAmt(disp)}</span>`;
            html += `<span class="text-[11px] ${unitCls}">${esc(ing.unit)}</span></button>`;
            html += `</div>`;

            if (hasAlts && altOpen && !excl) {
                const opts = [id, ...ing.alternatives];
                html += '<div class="mt-2 ml-7 space-y-1">';
                for (const altId of opts) {
                    const def = INGREDIENTS[altId];
                    const name = def?.name || altId;
                    const isSel = eid === altId;
                    const isOrig = altId === id;
                    const cls2 = isSel ? 'border-gray-900 bg-gray-50 ring-1 ring-gray-900' : 'border-gray-200 bg-white hover:border-gray-300';
                    const radio = `<div class="w-3.5 h-3.5 rounded-full border-2 shrink-0 ${isSel ? 'border-gray-900' : 'border-gray-300'} flex items-center justify-center">${isSel ? '<div class="w-1.5 h-1.5 rounded-full bg-gray-900"></div>' : ''}</div>`;
                    const tag = isOrig ? `<span class="text-[9px] px-1.5 py-0.5 rounded ${isSel ? 'bg-gray-200 text-gray-600' : 'bg-gray-100 text-gray-400'} font-medium ml-auto shrink-0">Domyślny</span>` : '';
                    const n = nutFor(altId, disp, ing.unit);
                    const nLine = n ? `<div class="text-[10px] text-gray-400 mt-0.5 tabular-nums">${n.kcal} kcal · ${n.protein}g B · ${n.fat}g T · ${n.carbs}g W</div>` : '';
                    html += `<button type="button" class="mpe-alt-pick w-full text-left p-2 rounded-lg border transition-all ${cls2}" data-orig-id="${esc(id)}" data-alt-id="${esc(altId)}"><div class="flex items-center gap-2">${radio}<span class="text-[11px] font-semibold text-gray-900">${esc(name)}</span>${tag}</div>${nLine}</button>`;
                }
                html += '</div>';
            }

            html += '</div>';
        }

        for (const a of S.added) {
            const def = INGREDIENTS[a.ingredientId];
            const name = def?.name || a.ingredientId;
            const disp = a.amount * S.servings;
            html += `<div class="mpe-ing-row rounded-xl border border-emerald-200 bg-emerald-50/30 p-2.5" data-ing-id="${esc(a.ingredientId)}" data-type="added">
                <div class="flex items-center gap-2.5">
                    <span class="shrink-0 w-5 h-5 rounded-md bg-emerald-100 flex items-center justify-center text-emerald-600"><i class="fas fa-plus text-[8px]"></i></span>
                    <span class="flex-1 min-w-0 text-[12px] font-semibold text-gray-900 truncate">${esc(name)}</span>
                    <button type="button" class="mpe-edit-amt shrink-0 flex items-center gap-1 px-2 py-1 rounded-lg hover:bg-gray-100 transition-colors" data-ing-id="${esc(a.ingredientId)}" data-type="added">
                        <span class="text-[12px] font-semibold text-gray-900 tabular-nums">${fmtAmt(disp)}</span>
                        <span class="text-[11px] text-gray-500">${esc(a.unit)}</span>
                    </button>
                    <button type="button" class="mpe-remove-added shrink-0 w-6 h-6 rounded-full border border-gray-200 text-gray-400 hover:text-red-600 hover:border-red-200 hover:bg-red-50 flex items-center justify-center transition-colors" data-ing-id="${esc(a.ingredientId)}"><i class="fas fa-times text-[8px]"></i></button>
                </div>
            </div>`;
        }

        list.innerHTML = html;
    }

    function renderAddArea() {
        const el = document.getElementById('mpe-add-area');
        if (!el) return;
        if (!S.addOpen) {
            el.innerHTML = `<button type="button" id="mpe-add-btn" class="w-full py-2 rounded-xl border border-dashed border-gray-200 text-[12px] font-semibold text-gray-500 hover:text-gray-900 hover:border-gray-400 hover:bg-gray-50 transition-colors"><i class="fas fa-plus text-[10px] mr-1.5 opacity-70"></i>Dodaj składnik</button>`;
            return;
        }
        const recipe = RECIPES[S.recipeId];
        const usedIds = new Set([
            ...(recipe?.ingredients.map((i) => i.ingredientId) || []),
            ...S.added.map((a) => a.ingredientId),
        ]);
        const q = S.addQuery.toLowerCase().trim();
        const avail = Object.values(INGREDIENTS).filter((i) => !usedIds.has(i.id) && (!q || i.name.toLowerCase().includes(q)));
        el.innerHTML = `
            <div class="border border-gray-200 rounded-xl bg-gray-50 p-3">
                <div class="flex items-center gap-2 mb-2">
                    <input type="text" id="mpe-add-search" class="flex-1 rounded-lg border border-gray-200 bg-white px-3 py-1.5 text-[12px] outline-none focus:border-gray-400 placeholder:text-gray-400" placeholder="Szukaj składnika…" value="${esc(S.addQuery)}">
                    <button type="button" id="mpe-add-cancel" class="text-[11px] font-semibold text-gray-500 hover:text-gray-900 px-2 py-1">Anuluj</button>
                </div>
                <div class="max-h-40 overflow-y-auto space-y-0.5 no-scrollbar" id="mpe-add-results">
                    ${avail.length === 0
                        ? '<p class="text-[11px] text-gray-400 text-center py-3">Brak wyników</p>'
                        : avail.slice(0, 20).map((i) => `<button type="button" class="mpe-add-pick w-full text-left px-2.5 py-2 rounded-lg hover:bg-white transition-colors text-[12px] font-medium text-gray-800" data-ing-id="${esc(i.id)}">${esc(i.name)} <span class="text-gray-400 text-[10px]">${esc(i.category)}</span></button>`).join('')}
                </div>
            </div>`;
    }

    function updateAddResults() {
        const results = document.getElementById('mpe-add-results');
        if (!results) return;
        const recipe = RECIPES[S.recipeId];
        const usedIds = new Set([
            ...(recipe?.ingredients.map((i) => i.ingredientId) || []),
            ...S.added.map((a) => a.ingredientId),
        ]);
        const q = S.addQuery.toLowerCase().trim();
        const avail = Object.values(INGREDIENTS).filter((i) => !usedIds.has(i.id) && (!q || i.name.toLowerCase().includes(q)));
        results.innerHTML = avail.length === 0
            ? '<p class="text-[11px] text-gray-400 text-center py-3">Brak wyników</p>'
            : avail.slice(0, 20).map((i) => `<button type="button" class="mpe-add-pick w-full text-left px-2.5 py-2 rounded-lg hover:bg-white transition-colors text-[12px] font-medium text-gray-800" data-ing-id="${esc(i.id)}">${esc(i.name)} <span class="text-gray-400 text-[10px]">${esc(i.category)}</span></button>`).join('');
    }

    function renderIngredients() {
        renderIngList();
        renderAddArea();
    }

    /* ── Nutrition summary ─────────────────────────── */

    function renderNutrition() {
        const el = document.getElementById('mpe-nutrition-section');
        if (!el) return;
        const n = totalNutrition();
        el.innerHTML = `
            <div class="rounded-xl border border-gray-100 bg-gray-50/80 p-3">
                <p class="text-[10px] font-bold text-gray-400 uppercase tracking-wider mb-2">Wartości odżywcze${S.servings > 1 ? ` · ${S.servings} porcje` : ''}</p>
                <div class="grid grid-cols-4 gap-3 text-center">
                    <div><span class="block text-[14px] font-bold text-gray-900 tabular-nums">${n.kcal}</span><span class="text-[10px] text-gray-500">kcal</span></div>
                    <div><span class="block text-[14px] font-bold text-gray-900 tabular-nums">${n.protein} g</span><span class="text-[10px] text-gray-500">Białko</span></div>
                    <div><span class="block text-[14px] font-bold text-gray-900 tabular-nums">${n.carbs} g</span><span class="text-[10px] text-gray-500">Węgle</span></div>
                    <div><span class="block text-[14px] font-bold text-gray-900 tabular-nums">${n.fat} g</span><span class="text-[10px] text-gray-500">Tłuszcze</span></div>
                </div>
            </div>`;
    }

    /* ── Render all ────────────────────────────────── */

    function renderAll() { renderCal(); renderSlots(); renderServings(); renderIngredients(); renderNutrition(); }

    /* ── Open / Close ─────────────────────────────── */

    function openEditor(opts) {
        const recipe = RECIPES[opts.recipeId];
        if (!recipe) return;

        S.mode = opts.mode || 'add';
        S.recipeId = opts.recipeId;
        S.servings = opts.servings || opts.entry?.servings || 1;
        S.subs = { ...(opts.substitutions || opts.entry?.substitutions || {}) };
        S.excluded = new Set(opts.entry?.excludedIngredients || []);
        S.overrides = { ...(opts.entry?.amountOverrides || {}) };
        S.added = (opts.entry?.addedIngredients || []).map((a) => ({ ...a }));
        S.entryId = opts.entry?.id || null;
        S.altOpen = new Set();
        S.addOpen = false;
        S.addQuery = '';

        if (opts.date && opts.slotId) {
            S.date = opts.date;
            S.slotId = opts.slotId;
            S.showCal = false;
        } else {
            const today = startOfDay(new Date());
            S.date = today;
            S.calDate = today;
            S.calExpanded = false;
            S.slotId = recipe.allowedSlots[0] || MEAL_SLOTS[0]?.id;
            S.showCal = true;
        }

        document.getElementById('mpe-title').textContent = S.mode === 'edit' ? 'Edytuj posiłek' : 'Zaplanuj posiłek';
        document.getElementById('mpe-subtitle').textContent = recipe.title;
        document.getElementById('mpe-confirm-label').textContent = S.mode === 'edit' ? 'Zapisz zmiany' : 'Dodaj do planu';

        renderAll();

        overlay.classList.remove('hidden');
        overlay.style.pointerEvents = 'auto';
        requestAnimationFrame(() => { sheet.style.transform = 'translateY(0)'; });
    }

    function closeEditor() {
        sheet.style.transform = 'translateY(100%)';
        setTimeout(() => { overlay.classList.add('hidden'); overlay.style.pointerEvents = 'none'; }, 300);
    }

    /* ── Save ──────────────────────────────────────── */

    function buildEntry() {
        const entry = { id: S.entryId || newPlanEntryId(), recipeId: S.recipeId, servings: S.servings };
        if (Object.keys(S.subs).length > 0) entry.substitutions = { ...S.subs };
        if (S.excluded.size > 0) entry.excludedIngredients = [...S.excluded];
        const recipe = RECIPES[S.recipeId];
        if (recipe) {
            const ov = {};
            for (const [k, v] of Object.entries(S.overrides)) {
                const orig = recipe.ingredients.find((i) => i.ingredientId === k);
                if (orig && Math.abs(v - orig.amount) > 0.01) ov[k] = v;
            }
            if (Object.keys(ov).length > 0) entry.amountOverrides = ov;
        }
        if (S.added.length > 0) entry.addedIngredients = S.added.map((a) => ({ ingredientId: a.ingredientId, amount: a.amount, unit: a.unit }));
        return entry;
    }

    function handleConfirm() {
        if (!S.recipeId || !S.date || !S.slotId) return;
        const plans = loadPlans();
        const key = dateKey(S.date);

        if (S.mode === 'edit' && S.entryId) {
            const arr = plans[key]?.[S.slotId];
            if (Array.isArray(arr)) {
                const idx = arr.findIndex((e) => e.id === S.entryId);
                if (idx >= 0) arr[idx] = buildEntry();
            }
        } else {
            if (!plans[key]) plans[key] = {};
            if (!plans[key][S.slotId]) plans[key][S.slotId] = [];
            plans[key][S.slotId].push(buildEntry());
        }

        savePlans(plans);
        closeEditor();
        showAppToast(S.mode === 'edit' ? 'Zapisano zmiany!' : 'Dodano do planera!');
        window.refreshPlanner?.();
    }

    /* ── Event bindings ───────────────────────────── */

    document.getElementById('mpe-close-btn')?.addEventListener('click', closeEditor);
    overlay?.addEventListener('click', (e) => { if (e.target === overlay) closeEditor(); });
    document.getElementById('mpe-confirm-btn')?.addEventListener('click', handleConfirm);

    document.getElementById('mpe-cal-prev')?.addEventListener('click', () => {
        if (!S.showCal) return;
        S.calDate = S.calExpanded ? addMonths(S.calDate, -1) : addDays(S.calDate, -7);
        renderCal();
    });
    document.getElementById('mpe-cal-next')?.addEventListener('click', () => {
        if (!S.showCal) return;
        S.calDate = S.calExpanded ? addMonths(S.calDate, 1) : addDays(S.calDate, 7);
        renderCal();
    });
    document.getElementById('mpe-cal-today')?.addEventListener('click', () => {
        const today = startOfDay(new Date());
        S.date = today; S.calDate = today;
        renderCal();
    });
    document.getElementById('mpe-cal-toggle')?.addEventListener('click', () => {
        S.calExpanded = !S.calExpanded;
        renderCal();
    });

    document.getElementById('mpe-slot-chips')?.addEventListener('click', (e) => {
        const btn = e.target.closest('.mpe-slot-btn');
        if (!btn) return;
        S.slotId = btn.dataset.slotId;
        renderSlots();
    });

    document.getElementById('mpe-servings-row')?.addEventListener('click', (e) => {
        if (e.target.closest('#mpe-serv-minus')) { if (S.servings <= 1) return; S.servings--; }
        else if (e.target.closest('#mpe-serv-plus')) { if (S.servings >= 12) return; S.servings++; }
        else return;
        renderServings();
        renderIngredients();
        renderNutrition();
    });

    /* ── Ingredient section delegation ────────────── */

    const ingSec = document.getElementById('mpe-ing-section');

    ingSec?.addEventListener('click', (e) => {
        const toggle = e.target.closest('.mpe-toggle');
        if (toggle) {
            const id = toggle.dataset.origId;
            if (S.excluded.has(id)) S.excluded.delete(id); else S.excluded.add(id);
            renderIngredients(); renderNutrition();
            return;
        }

        const shuffle = e.target.closest('.mpe-shuffle');
        if (shuffle) {
            const id = shuffle.dataset.origId;
            if (S.altOpen.has(id)) S.altOpen.delete(id); else S.altOpen.add(id);
            renderIngList();
            return;
        }

        const altPick = e.target.closest('.mpe-alt-pick');
        if (altPick) {
            const origId = altPick.dataset.origId;
            const altId = altPick.dataset.altId;
            if (altId === origId) delete S.subs[origId]; else S.subs[origId] = altId;
            S.altOpen.delete(origId);
            renderIngList(); renderNutrition();
            return;
        }

        const editAmt = e.target.closest('.mpe-edit-amt');
        if (editAmt && !editAmt.disabled) {
            startAmountEdit(editAmt);
            return;
        }

        const removeAdded = e.target.closest('.mpe-remove-added');
        if (removeAdded) {
            S.added = S.added.filter((a) => a.ingredientId !== removeAdded.dataset.ingId);
            renderIngredients(); renderNutrition();
            return;
        }

        if (e.target.closest('#mpe-add-btn')) {
            S.addOpen = true; S.addQuery = '';
            renderAddArea();
            document.getElementById('mpe-add-search')?.focus();
            return;
        }

        if (e.target.closest('#mpe-add-cancel')) {
            S.addOpen = false;
            renderAddArea();
            return;
        }

        const addPick = e.target.closest('.mpe-add-pick');
        if (addPick) {
            const ingId = addPick.dataset.ingId;
            const def = INGREDIENTS[ingId];
            if (!def) return;
            const unit = def.pantryUnit === 'szt' ? 'szt.' : def.pantryUnit;
            const amt = def.pantryUnit === 'szt' ? 1 : 100;
            S.added.push({ ingredientId: ingId, amount: amt, unit });
            S.addOpen = false;
            renderIngredients(); renderNutrition();
        }
    });

    ingSec?.addEventListener('input', (e) => {
        if (e.target.id === 'mpe-add-search') {
            S.addQuery = e.target.value;
            updateAddResults();
        }
    });

    /* ── Inline amount editing ────────────────────── */

    function startAmountEdit(btn) {
        const type = btn.dataset.type;
        const id = btn.dataset.origId || btn.dataset.ingId;
        const amtSpan = btn.querySelector('.tabular-nums');
        if (!amtSpan) return;

        const currentDisplay = parseFloat(amtSpan.textContent);
        const spans = btn.querySelectorAll('span');
        const unitText = spans.length > 0 ? spans[spans.length - 1].textContent.trim() : '';
        const saved = btn.innerHTML;

        btn.innerHTML = `<input type="number" class="mpe-amt-input w-16 text-right text-[12px] font-semibold text-gray-900 border border-gray-300 rounded-lg px-2 py-1 focus:border-gray-900 focus:ring-1 focus:ring-gray-900 outline-none tabular-nums" value="${currentDisplay}" min="0" step="any"><span class="text-[11px] text-gray-500 ml-1">${esc(unitText)}</span>`;

        const input = btn.querySelector('.mpe-amt-input');
        if (!input) { btn.innerHTML = saved; return; }
        input.focus();
        input.select();

        let done = false;
        const finish = (save) => {
            if (done) return;
            done = true;
            if (save) {
                const raw = Math.max(0, parseFloat(input.value) || 0);
                const newBase = S.servings > 0 ? raw / S.servings : raw;
                const rounded = Math.round(newBase * 100) / 100;

                if (type === 'recipe') {
                    const recipe = RECIPES[S.recipeId];
                    const orig = recipe?.ingredients.find((i) => i.ingredientId === id);
                    if (orig && Math.abs(rounded - orig.amount) > 0.01) S.overrides[id] = rounded;
                    else delete S.overrides[id];
                } else if (type === 'added') {
                    const a = S.added.find((x) => x.ingredientId === id);
                    if (a) a.amount = rounded;
                }
            }
            renderIngList();
            renderNutrition();
        };

        input.addEventListener('blur', () => finish(true));
        input.addEventListener('keydown', (e) => {
            if (e.key === 'Enter') { e.preventDefault(); input.blur(); }
            if (e.key === 'Escape') { e.preventDefault(); finish(false); }
        });
    }

    /* ── Expose globally ──────────────────────────── */

    window.openMealPlanEditor = openEditor;
    window.closeMealPlanEditor = closeEditor;
}
