// Production - The Idle Game: Main Application Orchestrator
// Fine-grained DOM updates without full innerHTML teardowns

import { GState } from './core/state.js';
import { SimulationEngine } from './core/engine.js';
import { SyncManager } from './core/sync.js';
import { fmtCurrency, fmtNum, fmtRate, getNotation, setNotation } from './core/formatters.js';
import { PRODUCTS, SECTORS, getProduct } from './data/products.js';
import { mountProductionFloor, updateProductionFloor, calculateMultiCost } from './ui/productionView.js';
import { renderSectorTabsHtml } from './ui/production/sectorBar.js';
import { mountUnitDetailView, updateUnitDetailView } from './ui/unitDetailView.js';
import { mountContractsBoard, updateContractsBoard } from './ui/contractsView.js';
import { mountBoardroom, updateBoardroom } from './ui/boardroomView.js';
import { mountInspector, updateInspector } from './ui/inspectorView.js';
import { mountAchievements, updateAchievements } from './ui/achievementsView.js';

class ProductionApp {
    constructor() {
        this.sm = GState;
        this.engine = new SimulationEngine(this.sm);
        this.sync = new SyncManager(this.sm);
        this.lastFrameTime = performance.now();
        this.lastSaveTime = Date.now();
        this.currentMountedTab = null;
        this.currentMountedSector = null;
        this.currentMountedProduct = null;
    }

    async init() {
        // Check for offline progress
        const now = Date.now();
        const elapsedSeconds = (now - this.sm.state.lastTick) / 1000;
        if (elapsedSeconds > 5) {
            const result = this.engine.processOffline(elapsedSeconds);
            if (result.earned > 0) {
                this.showToast(`Executive Briefing: Your automated lines generated ${fmtCurrency(result.earned)} during ${Math.round(result.seconds / 60)}m away!`, 'success');
            }
        }

        this.setupDomEvents();
        
        // Initial Mount (builds DOM nodes ONCE)
        this.mountActiveView();
        this.mountInspectorPane();
        this.updateHud();

        // Check if logged in and sync cloud state
        if (this.sync.isLoggedIn()) {
            this.sync.fetchCloudState().then(cloud => {
                if (cloud && cloud.lastTick > this.sm.state.lastTick) {
                    this.sm.state = { ...this.sm.state, ...cloud };
                    this.sm.save();
                    this.mountActiveView();
                    this.mountInspectorPane();
                }
            });
        }

        // Main game loop (ticks at 60fps, fine-grained updates without innerHTML)
        const loop = (currentTime) => {
            const dt = Math.min((currentTime - this.lastFrameTime) / 1000, 0.5);
            this.lastFrameTime = currentTime;

            this.engine.tick(dt);
            this.updateHud();
            this.updateActiveView();
            this.updateInspectorPane();

            // Auto-save every 5 seconds
            if (Date.now() - this.lastSaveTime > 5000) {
                this.sm.save();
                this.lastSaveTime = Date.now();
            }

            requestAnimationFrame(loop);
        };
        requestAnimationFrame(loop);
    }

    setupDomEvents() {
        // Navigation Tabs (Desktop sidebar + Mobile bottom nav)
        document.querySelectorAll('.nav-btn, .nav-tab').forEach(btn => {
            btn.onclick = () => {
                const tab = btn.dataset.tab;
                if (!tab) return;
                this.sm.state.activeTab = tab;
                document.querySelectorAll('.nav-btn, .nav-tab').forEach(b => {
                    b.classList.toggle('active', b.dataset.tab === tab);
                });
                this.mountActiveView();
            };
        });

        // Buy Multiplier Bar
        document.querySelectorAll('.btn-multi-pill').forEach(btn => {
            btn.onclick = () => {
                const mode = btn.dataset.mode;
                this.sm.state.buyMode = mode;
                document.querySelectorAll('.btn-multi-pill').forEach(b => b.classList.remove('active'));
                btn.classList.add('active');
                this.mountActiveView(); // Remount button labels for 1x/10x/100x
            };
        });

        // Sidebar Sector Buttons
        document.querySelectorAll('.sidebar-sector-btn').forEach(btn => {
            btn.onclick = () => {
                const sector = btn.dataset.sector;
                this.sm.state.activeTab = 'production';
                this.sm.state.selectedSector = sector;
                document.querySelectorAll('.nav-btn, .nav-tab').forEach(b => {
                    b.classList.toggle('active', b.dataset.tab === 'production');
                });
                this.mountActiveView();
            };
        });

        // User Profile & Settings
        const userBadge = document.getElementById('user-badge');
        if (userBadge) {
            userBadge.onclick = () => this.openAuthModal();
        }

        const settingsBtn = document.getElementById('btn-open-settings');
        if (settingsBtn) {
            settingsBtn.onclick = () => this.toggleSettings();
        }

        // Dark / Light Theme Toggle
        this.initTheme();
        const themeBtn = document.getElementById('btn-theme-toggle');
        if (themeBtn) {
            themeBtn.onclick = () => this.toggleTheme();
        }

        // Global Keyboard Shortcut: ESC returns to production floor if on unit_detail
        window.addEventListener('keydown', (e) => {
            if (e.key === 'Escape' && this.sm.state.activeTab === 'unit_detail') {
                this.handleAction({ type: 'CLOSE_UNIT_DETAIL' });
            }
        });

        // Auth Modal Close & Submit
        const closeAuth = document.getElementById('btn-close-auth');
        if (closeAuth) closeAuth.onclick = () => this.closeAuthModal();

        const loginBtn = document.getElementById('btn-login-submit');
        if (loginBtn) loginBtn.onclick = () => this.handleLogin();

        const registerBtn = document.getElementById('btn-register-submit');
        if (registerBtn) registerBtn.onclick = () => this.handleRegister();
    }

    initTheme() {
        const savedTheme = localStorage.getItem('production_theme') || 
            (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light');
        this.applyTheme(savedTheme);
    }

    toggleTheme() {
        const current = document.documentElement.getAttribute('data-theme') || 'light';
        const next = current === 'dark' ? 'light' : 'dark';
        this.applyTheme(next);
        this.showToast(`Theme switched to ${next.toUpperCase()} mode`, 'info');
    }

    applyTheme(theme) {
        document.documentElement.setAttribute('data-theme', theme);
        localStorage.setItem('production_theme', theme);
        const iconEl = document.getElementById('theme-toggle-icon');
        const textEl = document.getElementById('theme-toggle-text');
        if (iconEl) {
            iconEl.setAttribute('icon', theme === 'dark' ? 'lucide:sun' : 'lucide:moon');
        }
        if (textEl) {
            textEl.textContent = theme === 'dark' ? 'Light' : 'Dark';
        }
    }

    handleAction(action) {
        const state = this.sm.state;

        switch (action.type) {
            case 'SELECT_SECTOR':
                state.selectedSector = action.sector;
                if (state.activeTab !== 'production') {
                    state.activeTab = 'production';
                    document.querySelectorAll('.nav-btn, .nav-tab').forEach(b => {
                        b.classList.toggle('active', b.dataset.tab === 'production');
                    });
                }
                this.mountActiveView();
                break;

            case 'OPEN_UNIT_DETAIL': {
                state.selectedProductId = action.productId;
                state.activeTab = 'unit_detail';
                this.mountActiveView();
                window.scrollTo({ top: 0, behavior: 'smooth' });
                break;
            }

            case 'CLOSE_UNIT_DETAIL': {
                state.activeTab = 'production';
                this.mountActiveView();
                requestAnimationFrame(() => {
                    const cardEl = document.getElementById('card-' + state.selectedProductId);
                    if (cardEl) {
                        cardEl.scrollIntoView({ behavior: 'smooth', block: 'center' });
                    }
                });
                break;
            }

            case 'SELECT_PRODUCT': {
                state.selectedProductId = action.productId;
                const targetP = getProduct(action.productId);

                // If user selected a dependency or unit from inspector, ensure we navigate / go to that facility card
                let needsViewMount = false;
                if (state.activeTab !== 'production') {
                    state.activeTab = 'production';
                    document.querySelectorAll('.nav-btn, .nav-tab').forEach(b => {
                        b.classList.toggle('active', b.dataset.tab === 'production');
                    });
                    needsViewMount = true;
                }

                if (targetP && state.selectedSector !== 'all' && state.selectedSector !== targetP.sector) {
                    state.selectedSector = targetP.sector;
                    needsViewMount = true;
                }

                if (needsViewMount) {
                    this.mountActiveView();
                }
                this.mountInspectorPane();

                // Smooth scroll to the facility card and highlight it
                requestAnimationFrame(() => {
                    const cardEl = document.getElementById('card-' + action.productId);
                    if (cardEl) {
                        cardEl.scrollIntoView({ behavior: 'smooth', block: 'center' });
                        cardEl.classList.remove('card-highlight-pulse');
                        void cardEl.offsetWidth; // Force CSS reflow to re-trigger animation
                        cardEl.classList.add('card-highlight-pulse');
                        setTimeout(() => {
                            cardEl.classList.remove('card-highlight-pulse');
                        }, 1600);
                    }
                });
                break;
            }

            case 'UNLOCK_PRODUCT': {
                const p = getProduct(action.productId);
                if (p && state.cash >= p.unlockCost && !state.products[p.id]?.unlocked) {
                    state.cash -= p.unlockCost;
                    if (!state.products[p.id]) state.products[p.id] = {};
                    state.products[p.id].unlocked = true;
                    state.products[p.id].lines = 1;
                    state.selectedProductId = p.id;
                    this.showToast(`Industrial Permit Acquired: ${p.name}!`, 'success');
                    this.sync.queueAction(action);
                    this.mountActiveView();
                    this.mountInspectorPane();
                }
                break;
            }

            case 'BUY_LINES': {
                const p = getProduct(action.productId);
                const pState = state.products[action.productId];
                if (p && pState) {
                    const calc = calculateMultiCost(p.baseFacilityCost, pState.lines, state.buyMode);
                    if (state.cash >= calc.cost) {
                        state.cash -= calc.cost;
                        pState.lines += calc.count;
                        this.showToast(`Expanded ${p.facilityName}: +${calc.count} lines!`, 'info');
                        this.sync.queueAction(action);
                        this.mountActiveView();
                        this.mountInspectorPane();
                    }
                }
                break;
            }

            case 'HIRE_MANAGER': {
                const p = getProduct(action.productId);
                const pState = state.products[action.productId];
                if (p && pState && !pState.manager && state.cash >= p.baseManagerCost) {
                    state.cash -= p.baseManagerCost;
                    pState.manager = true;
                    state.stats.managersHired = (state.stats.managersHired || 0) + 1;
                    this.showToast(`Operations Lead Hired: ${p.managerName}!`, 'success');
                    this.sync.queueAction(action);
                    this.mountActiveView();
                }
                break;
            }

            case 'BUY_LOGISTICS': {
                const p = getProduct(action.productId);
                const pState = state.products[action.productId];
                if (p && pState) {
                    const cost = p.baseLogisticsCost * Math.pow(1.15, pState.logistics || 0);
                    if (state.cash >= cost) {
                        state.cash -= cost;
                        pState.logistics = (pState.logistics || 0) + 1;
                        this.showToast(`Logistics Fleet Expanded for ${p.name}!`, 'info');
                        this.sync.queueAction(action);
                        this.mountActiveView();
                        this.mountInspectorPane();
                    }
                }
                break;
            }

            case 'TOGGLE_LOGISTICS': {
                const p = getProduct(action.productId);
                const pState = state.products[action.productId];
                if (p && pState) {
                    const nextVal = pState.logisticsEnabled === false ? true : false;
                    pState.logisticsEnabled = nextVal;
                    this.showToast(`${p.name} Wholesale Fleet: ${nextVal ? 'ENABLED' : 'PAUSED'}`, nextVal ? 'success' : 'info');
                    this.sync.queueAction(action);
                    this.updateActiveView();
                    this.updateInspectorPane();
                }
                break;
            }

            case 'TOGGLE_DOWNSTREAM_SUPPLY': {
                const p = getProduct(action.productId);
                const pState = state.products[action.productId];
                if (p && pState) {
                    const nextVal = pState.supplyDownstreamEnabled === false ? true : false;
                    pState.supplyDownstreamEnabled = nextVal;
                    this.showToast(`${p.name} Downstream Supply: ${nextVal ? 'ALLOWED' : 'BLOCKED'}`, nextVal ? 'success' : 'warning');
                    this.sync.queueAction(action);
                    this.updateActiveView();
                    this.updateInspectorPane();
                }
                break;
            }

            case 'SET_PRODUCTION_TARGET': {
                const p = getProduct(action.productId);
                const pState = state.products[action.productId];
                if (p && pState) {
                    const target = Math.max(0, Math.min(1.0, action.target));
                    pState.productionTarget = target;
                    const pct = Math.round(target * 100);
                    this.showToast(`${p.name} Production Target set to ${pct}%`, 'info');
                    this.sync.queueAction(action);
                    this.updateActiveView();
                    this.updateInspectorPane();
                }
                break;
            }

            case 'MANUAL_CYCLE': {
                const p = getProduct(action.productId);
                const pState = state.products[action.productId];
                if (p && pState) {
                    const isRaw = !p.inputs || p.inputs.length === 0;
                    let canRun = true;
                    if (!isRaw) {
                        canRun = p.inputs.every(inp => (state.products[inp.id]?.stock || 0) >= inp.amount);
                    }

                    if (canRun) {
                        if (!isRaw) {
                            p.inputs.forEach(inp => {
                                state.products[inp.id].stock -= inp.amount;
                            });
                        }
                        const yieldAmt = p.outputAmount * Math.max(1, pState.lines);
                        pState.stock += yieldAmt;
                        pState.totalProduced = (pState.totalProduced || 0) + yieldAmt;
                        state.stats.totalProduced = (state.stats.totalProduced || 0) + yieldAmt;
                        this.showToast(`Batch Produced: +${yieldAmt} ${p.name}!`, 'info');
                    } else {
                        this.showToast(`Insufficient inputs to cycle batch!`, 'warning');
                    }
                }
                break;
            }

            case 'FULFILL_CONTRACT': {
                const idx = (state.activeContracts || []).findIndex(c => c.uid === action.uid);
                if (idx !== -1) {
                    const c = state.activeContracts[idx];
                    const pState = state.products[c.productId];
                    if (pState && pState.stock >= c.targetAmount) {
                        pState.stock -= c.targetAmount;
                        const subsidyBonus = 1.0 + 0.35 * (state.boardroomPerks['government_subsidies'] || 0);
                        const totalPayout = c.rewardCash * subsidyBonus;
                        state.cash += totalPayout;
                        state.lifetimeRevenue += totalPayout;
                        state.reputation = (state.reputation || 0) + c.rewardRep;
                        state.stats.contractsCompleted = (state.stats.contractsCompleted || 0) + 1;

                        state.activeContracts.splice(idx, 1);
                        state.contractCooldown = 10.0; // 10 second cooldown before new tender RFP appears

                        // Recompute readyContractsCount
                        let readyCount = 0;
                        for (const actC of state.activeContracts) {
                            const ps = state.products[actC.productId];
                            if (ps && (ps.stock || 0) >= actC.targetAmount) readyCount++;
                        }
                        state.readyContractsCount = readyCount;

                        this.showToast(`Contract Fulfilled! Earned ${fmtCurrency(totalPayout)} + ${c.rewardRep} Rep!`, 'success');
                        this.sync.queueAction(action);
                        this.mountActiveView();
                    }
                }
                break;
            }

            case 'TRIGGER_IPO': {
                this.showConfirmModal({
                    title: 'Authorize Initial Public Offering (IPO)',
                    subtitle: 'Corporate Equity Transition',
                    icon: 'lucide:trending-up',
                    text: 'Confirm Corporate Initial Public Offering (IPO)?<br><br>All factory floors and cash will be liquidated in exchange for permanent <strong>Venture Shares ($V-Shares)</strong> and corporate prestige bonuses!',
                    okText: 'Execute IPO',
                    cancelText: 'Abort'
                }).then(confirmed => {
                    if (confirmed) {
                        const success = this.sm.performIPO();
                        if (success) {
                            this.showToast(`IPO Successful! Welcome to Wall Street, CEO!`, 'success');
                            this.mountActiveView();
                            this.mountInspectorPane();
                        }
                    }
                });
                break;
            }

            case 'BUY_PERK': {
                const perk = (state.boardroomPerks || {})[action.perkId] || 0;
                import('./data/boardroom.js').then(({ BOARDROOM_PERKS }) => {
                    const def = BOARDROOM_PERKS.find(p => p.id === action.perkId);
                    if (def && perk < def.maxLevel) {
                        const cost = def.costShares[perk];
                        if (state.ventureShares >= cost) {
                            state.ventureShares -= cost;
                            state.boardroomPerks[action.perkId] = perk + 1;
                            this.showToast(`Boardroom R&D Unlocked: ${def.name}!`, 'success');
                            this.mountActiveView();
                        }
                    }
                });
                break;
            }

            case 'LIQUIDATE_STOCK': {
                const p = getProduct(action.productId);
                const pState = state.products[action.productId];
                if (p && pState && pState.stock > 0) {
                    const ratio = action.ratio || 1.0;
                    const sold = Math.floor(pState.stock * ratio);
                    if (sold > 0) {
                        pState.stock -= sold;
                        const earned = sold * p.basePrice;
                        state.cash += earned;
                        state.lifetimeRevenue += earned;
                        this.showToast(`Liquidated ${fmtNum(sold, 0)} ${p.name} for ${fmtCurrency(earned)}!`, 'info');
                    }
                }
                break;
            }
        }
    }

    updateHud() {
        const state = this.sm.state;

        const elCash = document.getElementById('hud-cash');
        if (elCash) {
            const val = fmtNum(state.cash);
            if (elCash.textContent !== val) elCash.textContent = val;
        }

        const elRate = document.getElementById('hud-rate');
        if (elRate) {
            const val = fmtRate(this.engine.cashRate).replace('+$', '');
            if (elRate.textContent !== val) elRate.textContent = val;
        }

        const elValuation = document.getElementById('hud-valuation');
        if (elValuation) {
            const val = fmtCurrency(state.valuation);
            if (elValuation.textContent !== val) elValuation.textContent = val;
        }

        const elShares = document.getElementById('hud-shares');
        if (elShares) {
            const val = fmtNum(state.ventureShares, 0);
            if (elShares.textContent !== val) elShares.textContent = val;
        }

        const elContractsBadge = document.getElementById('contracts-badge');
        if (elContractsBadge) {
            const readyCount = state.readyContractsCount || 0;
            const textVal = String(readyCount);
            if (elContractsBadge.textContent !== textVal) {
                elContractsBadge.textContent = textVal;
            }
            elContractsBadge.style.display = readyCount > 0 ? 'inline-flex' : 'none';
        }

        const userBadge = document.getElementById('user-badge');
        if (userBadge) {
            userBadge.textContent = this.sync.isLoggedIn() ? `[${this.sync.getUsername()}]` : `[GUEST]`;
        }

        // Update sidebar sector rate badges
        if (this.engine.sectorStats) {
            for (const s of SECTORS) {
                const stats = this.engine.sectorStats[s.id];
                if (stats) {
                    const elRate = document.getElementById(`sb-rate-${s.id}`);
                    if (elRate) {
                        const val = `+$${fmtNum(stats.revenueRate, 2)}/s`;
                        if (elRate.textContent !== val) elRate.textContent = val;
                    }
                }
            }
        }
    }

    mountHeaderSectorBar() {
        const headerSectorContainer = document.getElementById('header-sector-container');
        if (!headerSectorContainer) return;
        const selectedSector = this.sm.state.selectedSector || 'all';
        headerSectorContainer.innerHTML = renderSectorTabsHtml(selectedSector, this.engine);
        headerSectorContainer.querySelectorAll('.sector-pill').forEach(btn => {
            btn.onclick = () => this.handleAction({ type: 'SELECT_SECTOR', sector: btn.dataset.sector });
        });
    }

    /**
     * Mounts the main viewport view ONCE when the tab or sector changes
     */
    mountActiveView() {
        const container = document.getElementById('main-viewport');
        if (!container) return;

        const tab = this.sm.state.activeTab || 'production';
        const sector = this.sm.state.selectedSector || 'all';
        this.currentMountedTab = tab;
        this.currentMountedSector = sector;

        // Keep header sector tabs in sync with selectedSector
        this.mountHeaderSectorBar();

        if (tab === 'production') {
            mountProductionFloor(container, this.sm.state, (a) => this.handleAction(a), this.engine);
        } else if (tab === 'unit_detail') {
            mountUnitDetailView(container, this.sm.state, (a) => this.handleAction(a), this.engine);
        } else if (tab === 'contracts') {
            mountContractsBoard(container, this.sm.state, (a) => this.handleAction(a));
        } else if (tab === 'boardroom') {
            mountBoardroom(container, this.sm.state, (a) => this.handleAction(a));
        } else if (tab === 'milestones') {
            mountAchievements(container, this.sm.state, (a) => this.handleAction(a));
        }
    }

    /**
     * Mounts the inspector panel ONCE when selected product changes (legacy stub)
     */
    mountInspectorPane() {
        const inspectorContainer = document.getElementById('desktop-inspector-panel');
        if (inspectorContainer) {
            this.currentMountedProduct = this.sm.state.selectedProductId;
            mountInspector(inspectorContainer, this.sm.state, (a) => this.handleAction(a));
        }
    }

    /**
     * Executes fine-grained in-place element updates without innerHTML teardowns
     */
    updateActiveView() {
        const container = document.getElementById('main-viewport');
        if (!container) return;

        const tab = this.sm.state.activeTab || 'production';
        if (tab !== this.currentMountedTab) {
            this.mountActiveView();
            return;
        }

        if (tab === 'production') {
            updateProductionFloor(container, this.sm.state, this.engine);
        } else if (tab === 'unit_detail') {
            updateUnitDetailView(container, this.sm.state, this.engine);
        } else if (tab === 'contracts') {
            updateContractsBoard(container, this.sm.state, (a) => this.handleAction(a));
        } else if (tab === 'boardroom') {
            updateBoardroom(container, this.sm.state);
        } else if (tab === 'milestones') {
            updateAchievements(container, this.sm.state);
        }
    }

    updateInspectorPane() {
        const inspectorContainer = document.getElementById('desktop-inspector-panel');
        if (!inspectorContainer) return;

        if (this.sm.state.selectedProductId !== this.currentMountedProduct) {
            this.mountInspectorPane();
            return;
        }

        updateInspector(inspectorContainer, this.sm.state);
    }

    showToast(message, type = 'info') {
        const container = document.getElementById('toast-container');
        if (!container) return;

        const toast = document.createElement('div');
        toast.className = `toast-msg toast-${type}`;
        toast.innerHTML = `
            <iconify-icon icon="${type === 'success' ? 'lucide:check-circle' : type === 'warning' ? 'lucide:alert-circle' : 'lucide:info'}"></iconify-icon>
            <span>${message}</span>
        `;
        container.appendChild(toast);

        setTimeout(() => {
            toast.classList.add('fade-out');
            setTimeout(() => toast.remove(), 400);
        }, 3200);
    }

    showConfirmModal({ title = 'Executive Authorization', subtitle = 'Board Confirmation', icon = 'lucide:alert-triangle', text = '', okText = 'Confirm', cancelText = 'Cancel' } = {}) {
        return new Promise((resolve) => {
            const modal = document.getElementById('confirm-modal');
            const elTitle = document.getElementById('confirm-modal-title');
            const elSub = document.getElementById('confirm-modal-subtitle');
            const elIcon = document.getElementById('confirm-modal-icon');
            const elText = document.getElementById('confirm-modal-text');
            const btnOk = document.getElementById('btn-confirm-ok');
            const btnCancel = document.getElementById('btn-confirm-cancel');

            if (!modal) return resolve(false);

            if (elTitle) elTitle.textContent = title;
            if (elSub) elSub.textContent = subtitle;
            if (elIcon) elIcon.setAttribute('icon', icon);
            if (elText) elText.innerHTML = text;
            if (btnOk) btnOk.textContent = okText;
            if (btnCancel) btnCancel.textContent = cancelText;

            const cleanup = () => {
                modal.classList.remove('open');
                btnOk.onclick = null;
                btnCancel.onclick = null;
            };

            btnOk.onclick = () => {
                cleanup();
                resolve(true);
            };

            btnCancel.onclick = () => {
                cleanup();
                resolve(false);
            };

            modal.classList.add('open');
        });
    }

    openAuthModal() {
        const modal = document.getElementById('auth-modal');
        const errBox = document.getElementById('auth-error-msg');
        if (errBox) {
            errBox.style.display = 'none';
            errBox.textContent = '';
        }
        if (modal) modal.classList.add('open');
    }

    closeAuthModal() {
        const modal = document.getElementById('auth-modal');
        if (modal) modal.classList.remove('open');
    }

    showAuthError(msg) {
        const errBox = document.getElementById('auth-error-msg');
        if (errBox) {
            errBox.textContent = msg;
            errBox.style.display = 'block';
        } else {
            this.showToast(msg, 'warning');
        }
    }

    async handleLogin() {
        const u = document.getElementById('auth-username')?.value.trim();
        const p = document.getElementById('auth-password')?.value;
        if (!u || !p) return this.showAuthError('Please enter username and password');

        try {
            await this.sync.login(u, p);
            this.showToast(`Logged in as ${u}`, 'success');
            this.closeAuthModal();
            this.updateHud();
        } catch (err) {
            this.showAuthError(err.message || 'Login failed');
        }
    }

    async handleRegister() {
        const u = document.getElementById('auth-username')?.value.trim();
        const p = document.getElementById('auth-password')?.value;
        const hp = document.getElementById('auth-website-hp')?.value;
        if (!u || !p) return this.showAuthError('Please enter username and password');

        try {
            await this.sync.register(u, p, hp);
            this.showToast(`Account created! Welcome ${u}`, 'success');
            this.closeAuthModal();
            this.updateHud();
        } catch (err) {
            this.showAuthError(err.message || 'Registration failed');
        }
    }

    toggleSettings() {
        const current = getNotation();
        const next = current === 'standard' ? 'scientific' : 'standard';
        setNotation(next);
        this.showToast(`Number Notation: ${next.toUpperCase()}`, 'info');
        this.mountActiveView();
        this.mountInspectorPane();
    }
}

// Bootstrap
window.addEventListener('DOMContentLoaded', () => {
    const app = new ProductionApp();
    app.init();
    window.App = app;
});