/**
 * Cosmic Garden - UI Manager
 * Handles all rendering and user interface updates
 */

const UI = {
    /**
     * Initialize the UI
     */
    init() {
        this.renderBuildings();
        this.renderUpgrades();
        this.renderAchievements();
        this.updateSlotUI();
        this.update();
    },

    /**
     * Update all UI elements
     */
    update() {
        // Header
        document.getElementById('stardust-count').textContent = Game.formatNumber(Game.state.stardust);
        document.getElementById('stardust-ps').textContent = Game.formatNumber(Game.getProductionPerSecond());
        document.getElementById('click-power').textContent = Game.formatNumber(Game.getClickPower());
        document.getElementById('total-click-count').textContent = Game.formatNumber(Game.state.totalClicks);

        // Buildings
        this.updateBuildings();
        
        // Upgrades
        this.updateUpgrades();
        
        // Achievements
        this.updateAchievements();
        
        // Stats
        Stats.update();
        
        // Prestige
        PrestigeUI.update();
        
        // Golden Starbloom countdown badge
        this.updateGoldenBloomBadge();

        // Save Slot System highlight / toggle state
        this.updateSlotUI();

        // Save Slot System live preview in the footer
        this.updateSlotPreview();
    },

    /**
     * Render building cards
     */
    renderBuildings() {
        const container = document.getElementById('buildings-list');
        container.innerHTML = '';
        
        for (const [id, building] of Object.entries(BUILDINGS)) {
            const card = document.createElement('div');
            card.className = 'building-card';
            card.id = `building-${id}`;
            
            const count = Game.state.buildings[id] || 0;
            const cost = Game.getBuildingCost(id);
            const canAfford = Game.state.stardust >= cost;
            const locked = Game.state.totalStardust < building.unlockAt && count === 0;
            
            card.classList.toggle('locked', locked);
            
            card.innerHTML = `
                <div class="building-info">
                    <h4>${building.icon} ${building.name}</h4>
                    <div class="building-desc">${building.description}</div>
                    <div class="building-production">+${Game.formatNumber(building.baseProduction)}/s each</div>
                </div>
                <div class="building-stats">
                    <div class="building-cost">${Game.formatNumber(cost)} ✨</div>
                    <div class="building-count">${count}</div>
                    <button class="buy-btn" ${!canAfford || locked ? 'disabled' : ''}>Buy</button>
                    <button class="buy-max-btn" data-building="${id}" ${locked || count === 0 ? 'title="Buy as many as you can afford"' : 'disabled'}>${Game.formatNumber(Game.getMaxAffordable(id))}x Max</button>
                </div>
            `;
            
            if (!locked) {
                card.querySelector('.buy-btn').addEventListener('click', () => {
                    Game.buyBuilding(id);
                });
                const maxBtn = card.querySelector('.buy-max-btn');
                if (maxBtn) {
                    maxBtn.addEventListener('click', () => {
                        Game.buyMaxBuilding(id);
                    });
                }
            }
            
            container.appendChild(card);
        }
    },

    /**
     * Update building states
     */
    updateBuildings() {
        for (const [id, building] of Object.entries(BUILDINGS)) {
            const card = document.getElementById(`building-${id}`);
            if (!card) continue;
            
            const count = Game.state.buildings[id] || 0;
            const cost = Game.getBuildingCost(id);
            const canAfford = Game.state.stardust >= cost;
            const locked = Game.state.totalStardust < building.unlockAt && count === 0;
            
            card.querySelector('.building-cost').textContent = `${Game.formatNumber(cost)} ✨`;
            card.querySelector('.building-count').textContent = count;
            
            const btn = card.querySelector('.buy-btn');
            if (btn) {
                btn.disabled = !canAfford || locked;
            }
            
            // Buy Max button - reflect how many can be bought at current stardust
            const maxBtn = card.querySelector('.buy-max-btn');
            if (maxBtn) {
                const affordable = Game.getMaxAffordable(id);
                maxBtn.textContent = `${Game.formatNumber(affordable)}x Max`;
                maxBtn.disabled = locked || affordable === 0;
                maxBtn.title = affordable > 0 ? `Buy up to ${affordable} ${building.name}(s)` : 'Not enough stardust';
            }
            
            card.classList.toggle('locked', locked);
        }
    },

    /**
     * Render upgrade cards
     */
    renderUpgrades() {
        const container = document.getElementById('upgrades-list');
        container.innerHTML = '';
        
        for (const [id, upgrade] of Object.entries(UPGRADES)) {
            const card = document.createElement('div');
            card.className = 'upgrade-card';
            card.id = `upgrade-${id}`;
            
            const purchased = Game.state.upgrades.includes(id);
            const canAfford = Game.state.stardust >= upgrade.cost;
            
            // Check requirements
            let requirementsMet = true;
            let reqText = '';
            if (upgrade.requirements) {
                const reqParts = [];
                for (const [reqId, reqCount] of Object.entries(upgrade.requirements)) {
                    const currentCount = Game.state.buildings[reqId] || 0;
                    const building = BUILDINGS[reqId];
                    if (currentCount < reqCount) requirementsMet = false;
                    reqParts.push(`${building?.name || reqId}: ${currentCount}/${reqCount}`);
                }
                reqText = `<div class="upgrade-desc">Requires: ${reqParts.join(', ')}</div>`;
            }
            
            card.classList.toggle('purchased', purchased);
            card.classList.toggle('locked', !requirementsMet && !purchased);
            
            card.innerHTML = `
                <div class="upgrade-name">${upgrade.icon} ${upgrade.name}</div>
                <div class="upgrade-desc">${upgrade.description}</div>
                ${reqText}
                <div class="upgrade-cost">${purchased ? '✓ Owned' : `${Game.formatNumber(upgrade.cost)} ✨`}</div>
            `;
            
            if (!purchased && requirementsMet) {
                card.addEventListener('click', () => {
                    Game.buyUpgrade(id);
                });
            }
            
            container.appendChild(card);
        }
    },

    /**
     * Update upgrade states
     */
    updateUpgrades() {
        for (const [id, upgrade] of Object.entries(UPGRADES)) {
            const card = document.getElementById(`upgrade-${id}`);
            if (!card) continue;
            
            const purchased = Game.state.upgrades.includes(id);
            const costEl = card.querySelector('.upgrade-cost');
            
            if (costEl && !purchased) {
                const canAfford = Game.state.stardust >= upgrade.cost;
                costEl.textContent = canAfford ? `${Game.formatNumber(upgrade.cost)} ✨` : `❌ ${Game.formatNumber(upgrade.cost)} ✨`;
            }
        }
    },

    /**
     * Render achievements
     */
    renderAchievements() {
        const container = document.getElementById('achievements-list');
        container.innerHTML = '';
        
        for (const [id, achievement] of Object.entries(ACHIEVEMENTS)) {
            const el = document.createElement('div');
            el.className = 'achievement';
            
            const unlocked = Game.state.achievements.includes(id);
            el.classList.toggle('unlocked', unlocked);
            el.classList.toggle('locked', !unlocked);
            
            el.innerHTML = `
                <div class="achievement-icon">${unlocked ? achievement.icon : '🔒'}</div>
                <div class="achievement-name">${unlocked ? achievement.name : '???'}</div>
            `;
            
            if (unlocked) {
                el.title = `${achievement.name}: ${achievement.description}`;
            }
            
            container.appendChild(el);
        }
    },

    /**
     * Update achievements display
     */
    updateAchievements() {
        // Only re-render when needed (on new unlocks)
        const countEl = document.querySelector('#achievements-tab h3');
        if (countEl) {
            countEl.textContent = `Achievements (${Achievements.getCount()}/${Achievements.getTotal()})`;
        }
    },

    /**
     * Spawn a Golden Starbloom in the click area. Called by Game when the
     * random event becomes active. The bloom floats at a random position and
     * is clickable to claim its bonus.
     */
    spawnGoldenBloom() {
        const container = document.getElementById('golden-bloom-container');
        if (!container) return;

        // Remove any existing bloom first (shouldn't be one, but stay safe).
        this.removeGoldenBloom();

        const bloom = document.createElement('div');
        bloom.className = 'golden-bloom';
        bloom.textContent = '⭐';
        bloom.title = 'Golden Starbloom! Click for a bonus!';

        // Random position within the click area.
        const rect = container.getBoundingClientRect();
        const x = 20 + Math.random() * (Math.max(1, rect.width - 80));
        const y = 20 + Math.random() * (Math.max(1, rect.height - 80));
        bloom.style.left = `${x}px`;
        bloom.style.top = `${y}px`;

        // Click handler claims the bonus.
        bloom.addEventListener('click', () => {
            const earned = Game.claimGoldenBloom(rect.left + x, rect.top + y);
            this.removeGoldenBloom();
            if (earned > 0) {
                UI.showFloatingText(
                    rect.left + x, rect.top + y,
                    `+${Game.formatNumber(earned)} ✨`
                );
            }
        });

        container.appendChild(bloom);
    },

    /**
     * Remove any visible Golden Starbloom from the click area.
     */
    removeGoldenBloom() {
        const container = document.getElementById('golden-bloom-container');
        if (!container) return;
        const existing = container.querySelector('.golden-bloom');
        if (existing) existing.remove();
    },

    /**
     * Update the Golden Starbloom countdown badge shown in the header.
     */
    updateGoldenBloomBadge() {
        const el = document.getElementById('golden-bloom-badge');
        const remaining = Game.getGoldenBloomRemaining();
        if (!el) return;

        if (remaining > 0) {
            el.classList.add('active');
            el.textContent = `⭐ Golden Bloom: ${remaining}s`;
        } else {
            el.classList.remove('active');
        }
    },

    /**
     * Reflect the active save slot highlight and autosave toggle state.
     */
    updateSlotUI() {
        // Highlight the selected slot button.
        document.querySelectorAll('.slot-btn').forEach(btn => {
            const idx = parseInt(btn.dataset.slot, 10);
            btn.classList.toggle('active', idx === Game.state.activeSlot);
            btn.disabled = idx === Game.state.activeSlot;
        });

        // Reflect the autosave toggle state.
        const autosaveBtn = document.getElementById('autosave-btn');
        if (autosaveBtn) {
            if (Game.state.autoSave) {
                autosaveBtn.classList.add('on');
                autosaveBtn.textContent = 'ON';
            } else {
                autosaveBtn.classList.remove('on');
                autosaveBtn.textContent = 'OFF';
            }
        }
    },

    /**
     * Update the one-line live preview of the active slot in the footer.
     * Also wires hover handlers onto each slot button so hovering previews a
     * different slot's contents (stardust, buildings, achievements, last saved).
     * This is a read-only display helper and never mutates game state.
     */
    updateSlotPreview() {
        const el = document.getElementById('slot-preview');
        if (!el) return;

        // Hovering a slot button previews that slot's contents instead of the
        // active one. Track which slot is currently being previewed on hover.
        let hovering = null;

        const render = (slot) => {
            const preview = Game.getSlotPreview(slot);
            if (!preview.present) {
                el.textContent = `Slot ${slot + 1}: empty`;
                el.classList.add('empty');
                return;
            }
            el.classList.remove('empty');
            el.textContent =
                `Slot ${slot + 1}: ${Game.formatNumber(preview.stardust)} ✨ · ` +
                `${preview.buildings} plants · ${preview.achievements[0]}/${preview.achievements[1]} · ${preview.lastSaved}`;
        };

        // Default: preview the active slot live (updates every tick).
        render(Game.state.activeSlot);

        // Remove any previously-attached listeners to avoid duplicates on re-render.
        document.querySelectorAll('.slot-btn').forEach(btn => {
            btn.replaceWith(btn.cloneNode(true));
        });

        // On hover, preview the hovered slot; on leave, fall back to active.
        document.querySelectorAll('.slot-btn').forEach(btn => {
            const idx = parseInt(btn.dataset.slot, 10);
            btn.addEventListener('mouseenter', () => { hovering = idx; render(idx); });
            btn.addEventListener('mouseleave', () => { hovering = null; render(Game.state.activeSlot); });
        });
    },

    /**
     * Show floating text animation
     */
    showFloatingText(x, y, text) {
        const el = document.createElement('div');
        el.className = 'float-text';
        el.textContent = text;
        el.style.left = `${x}px`;
        el.style.top = `${y - 20}px`;
        document.body.appendChild(el);
        
        setTimeout(() => el.remove(), 1000);
    },

    /**
     * Show notification
     */
    showNotification(message, type = 'info') {
        const container = document.getElementById('notifications');
        const el = document.createElement('div');
        el.className = `notification ${type}`;
        el.textContent = message;
        container.appendChild(el);
        
        setTimeout(() => el.remove(), 3000);
    },

    /**
     * Show import modal
     */
    showImportModal() {
        document.getElementById('import-modal').classList.remove('hidden');
    },

    /**
     * Hide import modal
     */
    hideImportModal() {
        document.getElementById('import-modal').classList.add('hidden');
        document.getElementById('import-data').value = '';
    }
};

window.UI = UI;