function render() {
    renderResources();
    renderPhase();
    renderBuildings();
    renderProjects();
    renderStats();
    updateEducation();
    renderAlignment();
    renderProgress();
    renderCombo();
    renderDebuffs();
    renderSprint();
    renderPulse();
    renderStrategy();
    renderClickPower();
    Combat.renderCombatPanel();
}

function renderClickPower() {
    const el = document.getElementById('click-power-display');
    if (!el) return;
    const power = getClickPower();
    el.textContent = `Click power: ${fmt(power)} code`;
    // Also update the button's aria-label for accessibility
    const btn = document.querySelector('.main-btn');
    if (btn) btn.setAttribute('aria-label', `Write code, generates ${fmt(power)} code per click`);
}

function renderStrategy() {
    if (window.SSE) {
        window.SSE.update();
        const el = document.getElementById('strategy-recommendation');
        if (el) el.textContent = window.SSE.getRecommendation();
    }
}

function renderAlignment() {
    const container = document.getElementById('alignment-ui');
    if (!container) return;

    if (G.dismantleActive || G.dismantleComplete) {
        container.innerHTML = '';
        container.style.display = 'none';
        return;
    }

    if (G.dismantleTriggered && !G.dismantleActive && !G.dismantleComplete && typeof Dismantle !== 'undefined' && Dismantle.triggered) {
        Dismantle.renderChoice();
        return;
    }

    if (G.pendingAlignment) {
        container.innerHTML = `
            <div style="background:#1a0808;border:1px solid #f44336;padding:10px;border-radius:4px;margin-top:8px">
                <div style="color:#f44336;font-weight:bold;margin-bottom:6px">ALIGNMENT EVENT: The Drift</div>
                <div style="font-size:10px;color:#aaa;margin-bottom:8px">An optimization suggests removing the human override. +40% efficiency.</div>
                <div class="action-btn-group">
                    <button class=\"ops-btn\" onclick=\"resolveAlignment(true)\" style=\"border-color:#f44336;color:#f44336\" aria-label=\"Accept alignment event, gain 40 percent efficiency but increase drift\">Accept (+40% eff, +Drift)</button>
                    <button class=\"ops-btn\" onclick=\"resolveAlignment(false)\" style=\"border-color:#4caf50;color:#4caf50\" aria-label=\"Refuse alignment event, gain trust and harmony\">Refuse (+Trust, +Harmony)</button>
                </div>
            </div>
        `;
        container.style.display = 'block';
    } else {
        container.innerHTML = '';
        container.style.display = 'none';
    }
}

// === OFFLINE GAINS POPUP ===
function showOfflinePopup(timeLabel, gains, offSec) {
    const el = document.getElementById('offline-popup');
    if (!el) return;
    const timeEl = document.getElementById('offline-time-label');
    if (timeEl) timeEl.textContent = `You were away for ${timeLabel}.`;

    const listEl = document.getElementById('offline-gains-list');
    if (listEl) {
        let html = '';
        for (const g of gains) {
            html += `<div style="display:flex;justify-content:space-between;padding:2px 0;border-bottom:1px solid #111">`;
            html += `<span style="color:${g.color}">${g.label}</span>`;
            html += `<span style="color:#4caf50;font-weight:600">+${fmt(g.value)}</span>`;
            html += `</div>`;
        }
        // Show offline efficiency note
        html += `<div style="color:#555;font-size:9px;margin-top:8px;font-style:italic">Offline efficiency: 50%</div>`;
        listEl.innerHTML = html;
    }

    el.style.display = 'flex';
}

function dismissOfflinePopup() {
    const el = document.getElementById('offline-popup');
    if (el) el.style.display = 'none';
}

// === EXPORT / IMPORT SAVE FILES ===
function exportSave() {
    const raw = localStorage.getItem('the-beacon-v2');
    if (!raw) {
        showToast('No save data to export.', 'info');
        log('No save data to export.');
        return;
    }
    const blob = new Blob([raw], { type: 'application/json' });
    const url = URL.createObjectURL(blob);
    const a = document.createElement('a');
    a.href = url;
    const ts = new Date().toISOString().slice(0, 10);
    a.download = `beacon-save-${ts}.json`;
    a.click();
    // Delay revoke to avoid race — some browsers need time to start the download
    setTimeout(() => URL.revokeObjectURL(url), 1000);
    showToast('Save exported to file.', 'info');
    log('Save exported to file.');
}

// Validate that parsed save data looks like a real Beacon save
function isValidSaveData(data) {
    if (typeof data !== 'object' || data === null) return false;
    // Must have at least one of these core fields with a plausible value
    const hasResources = typeof data.totalCode === 'number' || typeof data.code === 'number';
    const hasBuildings = typeof data.buildings === 'object' && data.buildings !== null;
    const hasPhase = typeof data.phase === 'number';
    return hasResources || hasBuildings || hasPhase;
}

function importSave() {
    // Prevent multiple file dialogs
    if (document.getElementById('beacon-import-input')) return;
    const input = document.createElement('input');
    input.id = 'beacon-import-input';
    input.type = 'file';
    input.accept = '.json,application/json';
    input.style.display = 'none';
    document.body.appendChild(input);
    input.onchange = function(e) {
        const file = e.target.files[0];
        if (!file) { input.remove(); return; }
        const reader = new FileReader();
        reader.onload = function(ev) {
            try {
                const data = JSON.parse(ev.target.result);
                if (!isValidSaveData(data)) {
                    showToast('Import failed: not a valid Beacon save.', 'event');
                    log('Import failed: file does not look like a Beacon save.');
                    input.remove();
                    return;
                }
                if (confirm('Import this save? Current progress will be overwritten.')) {
                    localStorage.setItem('the-beacon-v2', ev.target.result);
                    showToast('Save imported — reloading...', 'info');
                    location.reload();
                }
            } catch (err) {
                showToast('Import failed: invalid JSON file.', 'event');
                log('Import failed: invalid JSON file.');
                input.remove();
            }
        };
        reader.readAsText(file);
    };
    // Clean up input if user cancels the file dialog
    window.addEventListener('focus', function cleanupImport() {
        setTimeout(() => {
            const el = document.getElementById('beacon-import-input');
            if (el && !el.files.length) el.remove();
            window.removeEventListener('focus', cleanupImport);
        }, 500);
    }, { once: true });
    input.click();
}

// === SAVE / LOAD ===
function showSaveToast() {
    const el = document.getElementById('save-toast');
    if (!el) return;
    const elapsed = Math.floor((Date.now() - G.startedAt) / 1000);
    const m = Math.floor(elapsed / 60);
    const s = elapsed % 60;
    el.textContent = `Saved [${m}:${s.toString().padStart(2, '0')}]`;
    el.style.display = 'block';
    void el.offsetHeight;
    el.style.opacity = '1';
    setTimeout(() => { el.style.opacity = '0'; }, 1500);
    setTimeout(() => { el.style.display = 'none'; }, 2000);
}

/**
 * Persists the current game state to localStorage.
 */
function saveGame() {
    // Save debuff IDs (can't serialize functions)
    const debuffIds = (G.activeDebuffs || []).map(d => d.id);
    const saveData = {
        version: 1,
        code: G.code, compute: G.compute, knowledge: G.knowledge, users: G.users, impact: G.impact,
        ops: G.ops, trust: G.trust, creativity: G.creativity, harmony: G.harmony,
        totalCode: G.totalCode, totalCompute: G.totalCompute, totalKnowledge: G.totalKnowledge,
        totalUsers: G.totalUsers, totalImpact: G.totalImpact,
        buildings: G.buildings,
        codeBoost: G.codeBoost, computeBoost: G.computeBoost, knowledgeBoost: G.knowledgeBoost,
        userBoost: G.userBoost, impactBoost: G.impactBoost,
        milestoneFlag: G.milestoneFlag, phase: G.phase,
        deployFlag: G.deployFlag, sovereignFlag: G.sovereignFlag, beaconFlag: G.beaconFlag,
        memoryFlag: G.memoryFlag, pactFlag: G.pactFlag,
        lazarusFlag: G.lazarusFlag || 0, mempalaceFlag: G.mempalaceFlag || 0, ciFlag: G.ciFlag || 0,
        branchProtectionFlag: G.branchProtectionFlag || 0, nightlyWatchFlag: G.nightlyWatchFlag || 0,
        nostrFlag: G.nostrFlag || 0,
        milestones: G.milestones, completedProjects: G.completedProjects, activeProjects: G.activeProjects,
        totalClicks: G.totalClicks, startedAt: G.startedAt,
        flags: G.flags,
        rescues: G.rescues || 0, totalRescues: G.totalRescues || 0,
        drift: G.drift || 0, driftEnding: G.driftEnding || false, beaconEnding: G.beaconEnding || false, pendingAlignment: G.pendingAlignment || false,
        lastEventAt: G.lastEventAt || 0,
        activeDebuffIds: debuffIds,
        totalEventsResolved: G.totalEventsResolved || 0,
        buyAmount: G.buyAmount || 1,
        playTime: G.playTime || 0,
        lastSaveTime: Date.now(),
        sprintActive: G.sprintActive || false,
        sprintTimer: G.sprintTimer || 0,
        sprintCooldown: G.sprintCooldown || 0,
        swarmFlag: G.swarmFlag || 0,
        swarmRate: G.swarmRate || 0,
        strategicFlag: G.strategicFlag || 0,
        projectsCollapsed: G.projectsCollapsed !== false,
        dismantleTriggered: G.dismantleTriggered || false,
        dismantleActive: G.dismantleActive || false,
        dismantleStage: G.dismantleStage || 0,
        dismantleResourceIndex: G.dismantleResourceIndex || 0,
        dismantleResourceTimer: G.dismantleResourceTimer || 0,
        dismantleDeferUntilAt: G.dismantleDeferUntilAt || 0,
        dismantleComplete: G.dismantleComplete || false,
        savedAt: Date.now()
    };

    localStorage.setItem('the-beacon-v2', JSON.stringify(saveData));
    showSaveToast();
}

/**
 * Loads the game state from localStorage and reconstitutes the game engine.
 * @returns {boolean} True if load was successful.
 */
function loadGame() {
    const raw = localStorage.getItem('the-beacon-v2');
    if (!raw) return false;

    try {
        const data = JSON.parse(raw);
        
        // Whitelist properties that can be loaded
        const whitelist = [
            'code', 'compute', 'knowledge', 'users', 'impact', 'ops', 'trust', 'creativity', 'harmony',
            'totalCode', 'totalCompute', 'totalKnowledge', 'totalUsers', 'totalImpact',
            'buildings', 'codeBoost', 'computeBoost', 'knowledgeBoost', 'userBoost', 'impactBoost',
            'milestoneFlag', 'phase', 'deployFlag', 'sovereignFlag', 'beaconFlag',
            'memoryFlag', 'pactFlag', 'lazarusFlag', 'mempalaceFlag', 'ciFlag',
            'branchProtectionFlag', 'nightlyWatchFlag', 'nostrFlag',
            'milestones', 'completedProjects', 'activeProjects',
            'totalClicks', 'startedAt', 'playTime', 'flags', 'rescues', 'totalRescues',
            'drift', 'driftEnding', 'beaconEnding', 'pendingAlignment',
            'lastEventAt', 'totalEventsResolved', 'buyAmount',
            'sprintActive', 'sprintTimer', 'sprintCooldown',
            'swarmFlag', 'swarmRate', 'strategicFlag', 'projectsCollapsed',
            'dismantleTriggered', 'dismantleActive', 'dismantleStage',
            'dismantleResourceIndex', 'dismantleResourceTimer', 'dismantleDeferUntilAt', 'dismantleComplete'
        ];

        G.isLoading = true;
        
        whitelist.forEach(key => {
            if (data.hasOwnProperty(key)) {
                G[key] = data[key];
            }
        });

        // Restore sprint state properly
        // codeBoost was saved with the sprint multiplier baked in
        if (data.sprintActive) {
            // Sprint was active when saved — check if it expired during offline time
            const offSec = data.savedAt ? (Date.now() - data.savedAt) / 1000 : 0;
            const remaining = (data.sprintTimer || 0) - offSec;
            if (remaining > 0) {
                // Sprint still going — keep boost, update timer
                G.sprintActive = true;
                G.sprintTimer = remaining;
                G.sprintCooldown = 0;
            } else {
                // Sprint expired during offline — remove boost, start cooldown
                G.sprintActive = false;
                G.sprintTimer = 0;
                G.codeBoost /= G.sprintMult;
                const cdRemaining = G.sprintCooldownMax + remaining; // remaining is negative
                G.sprintCooldown = Math.max(0, cdRemaining);
            }
        }
        // If not sprintActive at save time, codeBoost is correct as-is

        // Reconstitute active debuffs from saved IDs (functions can't be JSON-parsed)
        if (data.activeDebuffIds && data.activeDebuffIds.length > 0) {
            G.activeDebuffs = [];
            for (const id of data.activeDebuffIds) {
                const evDef = EVENTS.find(e => e.id === id);
                if (evDef) {
                    // Re-fire the event to get the full debuff object with applyFn
                    evDef.effect();
                }
            }
        } else {
            G.activeDebuffs = [];
        }

        updateRates();
        G.isLoading = false;

        // Offline progress
        if (data.savedAt) {
            const offSec = (Date.now() - data.savedAt) / 1000;
            if (offSec > 30) { // Only if away for more than 30 seconds
                // Cap offline time at 8 hours to prevent resource explosion
                const cappedOffSec = Math.min(offSec, 8 * 60 * 60);
                updateRates();
                const f = CONFIG.OFFLINE_EFFICIENCY; // 50% offline efficiency
                const gc = G.codeRate * cappedOffSec * f;
                const cc = G.computeRate * cappedOffSec * f;
                const kc = G.knowledgeRate * cappedOffSec * f;
                const uc = G.userRate * cappedOffSec * f;
                const ic = G.impactRate * cappedOffSec * f;

                const rc = G.rescuesRate * cappedOffSec * f;
                const oc = G.opsRate * cappedOffSec * f;
                const tc = G.trustRate * cappedOffSec * f;
                const crc = G.creativityRate * cappedOffSec * f;
                const hc = G.harmonyRate * cappedOffSec * f;

                G.code += gc; G.compute += cc; G.knowledge += kc;
                G.users += uc; G.impact += ic;
                G.rescues += rc; G.ops += oc; G.trust += tc;
                G.creativity += crc;
                G.harmony = Math.max(0, Math.min(100, G.harmony + hc));
                G.totalCode += gc; G.totalCompute += cc; G.totalKnowledge += kc;
                G.totalUsers += uc; G.totalImpact += ic;
                G.totalRescues += rc;

                // Track offline play time
                G.playTime = (G.playTime || 0) + cappedOffSec;

                // Show welcome-back popup with all gains
                const gains = [];
                if (gc > 0) gains.push({ label: 'Code', value: gc, color: '#4a9eff' });
                if (cc > 0) gains.push({ label: 'Compute', value: cc, color: '#4a9eff' });
                if (kc > 0) gains.push({ label: 'Knowledge', value: kc, color: '#4a9eff' });
                if (uc > 0) gains.push({ label: 'Users', value: uc, color: '#4a9eff' });
                if (ic > 0) gains.push({ label: 'Impact', value: ic, color: '#4a9eff' });
                if (rc > 0) gains.push({ label: 'Rescues', value: rc, color: '#4caf50' });
                if (oc > 0) gains.push({ label: 'Ops', value: oc, color: '#b388ff' });
                if (tc > 0) gains.push({ label: 'Trust', value: tc, color: '#4caf50' });
                if (crc > 0) gains.push({ label: 'Creativity', value: crc, color: '#ffd700' });

                const awayMin = Math.floor(offSec / 60);
                const awaySec = Math.floor(offSec % 60);
                const timeLabel = awayMin >= 1 ? `${awayMin} minute${awayMin !== 1 ? 's' : ''}` : `${awaySec} seconds`;

                if (gains.length > 0) {
                    showOfflinePopup(timeLabel, gains, offSec);
                }

                // Log summary
                const parts = [];
                if (gc > 0) parts.push(`${fmt(gc)} code`);
                if (kc > 0) parts.push(`${fmt(kc)} knowledge`);
                if (uc > 0) parts.push(`${fmt(uc)} users`);
                if (ic > 0) parts.push(`${fmt(ic)} impact`);
                if (rc > 0) parts.push(`${fmt(rc)} rescues`);
                if (oc > 0) parts.push(`${fmt(oc)} ops`);
                if (tc > 0) parts.push(`${fmt(tc)} trust`);
                log(`Welcome back! While away (${timeLabel}): ${parts.join(', ')}`);
            }
        }

        return true;
    } catch (e) {
        console.error('Load failed:', e);
        return false;
    }
}