/**
 * Cosmic Garden - Prestige UI Manager
 * Handles all prestige-related UI rendering and interactions
 */

const PrestigeUI = {
    /**
     * Initialize the prestige UI
     */
    init() {
        this.renderPrestigeUpgrades();
        this.setupEventListeners();
        this.update();
    },

    /**
     * Setup event listeners
     */
    setupEventListeners() {
        // Prestige button
        document.getElementById('prestige-btn')?.addEventListener('click', () => {
            const essenceGain = PRESTIGE.calculateEssence();
            
            if (essenceGain > 0) {
                if (confirm(
                    `Prestige now to earn ${essenceGain} Stellar Essence?\n\n` +
                    `You will keep your prestige upgrades and essence.\n` +
                    `All buildings, upgrades, and stardust will be reset.`
                )) {
                    PRESTIGE.prestige();
                }
            } else {
                UI.showNotification('Need more stardust to prestige!', 'warning');
            }
        });

        // Tab switching for prestige tab
        document.querySelectorAll('.tab-btn').forEach(btn => {
            btn.addEventListener('click', (e) => {
                const tab = e.target.dataset.tab;
                if (tab === 'prestige') {
                    this.renderPrestigeUpgrades();
                }
            });
        });

        // Buy Max prestige upgrades button - buy every affordable prestige
        // upgrade at once, paid from Stellar Essence.
        const buyMaxBtn = document.getElementById('buy-all-prestige');
        if (buyMaxBtn) {
            buyMaxBtn.addEventListener('click', () => {
                Game.buyMaxPrestigeUpgrades();
            });
        }
    },

    /**
     * Render prestige upgrade cards
     */
    renderPrestigeUpgrades() {
        const container = document.getElementById('prestige-upgrades-list');
        if (!container) return;

        container.innerHTML = '';

        for (const [id, upgrade] of Object.entries(PRESTIGE_UPGRADES)) {
            const card = document.createElement('div');
            card.className = 'prestige-upgrade-card';
            card.id = `prestige-upgrade-${id}`;

            const purchased = Game.state.prestigeUpgrades?.includes(id);
            const canAfford = (Game.state.stellarEssence || 0) >= upgrade.cost;

            card.classList.toggle('purchased', purchased);
            card.classList.toggle('locked', !purchased && !canAfford);

            card.innerHTML = `
                <div class=\"prestige-upgrade-name\">${upgrade.icon} ${upgrade.name}</div>
                <div class=\"prestige-upgrade-desc\">${upgrade.description}</div>
                <div class=\"prestige-upgrade-cost\">${purchased ? '✓ Owned' : `${upgrade.cost} ✦`}</div>
            `;

            if (!purchased && canAfford) {
                card.addEventListener('click', () => {
                    PRESTIGE.buyUpgrade(id);
                });
            }

            container.appendChild(card);
        }
    },

    /**
     * Update prestige display
     */
    update() {
        // Essence count
        const essenceEl = document.getElementById('prestige-essence-count');
        if (essenceEl) {
            essenceEl.textContent = Game.state.stellarEssence || 0;
        }

        // Multiplier display
        const multiplierEl = document.getElementById('prestige-multiplier');
        if (multiplierEl) {
            const multiplier = PRESTIGE.getMultiplier();
            const percent = Math.round((multiplier - 1) * 100);
            multiplierEl.textContent = `+${percent}%`;
        }

        // Next prestige essence
        const nextEl = document.getElementById('prestige-next-essence');
        if (nextEl) {
            const nextEssence = PRESTIGE.calculateEssence();
            nextEl.textContent = nextEssence;
        }

        // Prestige progress bar: how far total stardust is toward the next
        // Stellar Essence level. essence(e) = floor(sqrt(totalStardust/1e6)),
        // so tier e needs e^2*1M stardust and tier (e+1) needs (e+1)^2*1M.
        this.updatePrestigeProgress();

        // Update prestige button state
        const prestigeBtn = document.getElementById('prestige-btn');
        if (prestigeBtn) {
            const canPrestige = PRESTIGE.calculateEssence() > 0;
            prestigeBtn.disabled = !canPrestige;
            prestigeBtn.classList.toggle('can-prestige', canPrestige);
        }

        // Update prestige upgrades list if visible
        const prestigeTab = document.getElementById('prestige-tab');
        if (prestigeTab?.classList.contains('active')) {
            this.renderPrestigeUpgrades();
        }

        // Show/hide the "Buy Max" button based on whether any unowned prestige
        // upgrade is currently affordable with Stellar Essence. Read-only.
        this.updateBuyMaxPrestigeButton();
    },

    /**
     * Update the prestige progress bar showing how close total stardust is to
     * earning the next Stellar Essence. essence level e = floor(sqrt(totalStardust/1e6)),
     * so tier e begins at e^2*1M and tier (e+1) begins at (e+1)^2*1M; the bar
     * fills linearly across that tier's stardust range and resets to 0% exactly
     * when a new essence level is reached. Read-only: mutates only DOM.
     */
    updatePrestigeProgress() {
        const totalStardust = Game.state.totalStardust || 0;
        const e = Math.floor(Math.sqrt(totalStardust / 1e6));
        const tierFloor = e * e * 1e6;
        const tierCeil = (e + 1) * (e + 1) * 1e6;
        const progress = Math.min(1, Math.max(0, (totalStardust - tierFloor) / (tierCeil - tierFloor)));

        const fillEl = document.getElementById('prestige-progress-fill');
        if (fillEl) {
            const pct = Math.round(progress * 100);
            fillEl.style.width = `${pct}%`;
            // Only apply the pulsing glow while there is progress to show, so a
            // freshly-emptied bar (e.g. right after prestige) sits still.
            fillEl.classList.toggle('filling', pct > 0 && pct < 100);
        }

        const pctLabel = document.getElementById('prestige-progress-pct');
        if (pctLabel) {
            pctLabel.textContent = `${Math.round(progress * 100)}%`;
        }
    },

    /**
     * Show/hide and enable/disable the "Buy Max" prestige-upgrades button
     * depending on whether at least one unowned, requirement-met prestige
     * upgrade is currently affordable with Stellar Essence. Read of game state
     * only; never mutates it. Mirrors Game.buyMaxPrestigeUpgrades /
     * PRESTIGE.buyUpgrade semantics.
     */
    updateBuyMaxPrestigeButton() {
        const btn = document.getElementById('buy-all-prestige');
        if (!btn) return;

        let affordableAny = false;
        for (const [id, upgrade] of Object.entries(PRESTIGE_UPGRADES)) {
            if ((Game.state.prestigeUpgrades || []).includes(id)) continue;
            if ((Game.state.stellarEssence || 0) < upgrade.cost) continue;
            if (upgrade.requirements) {
                let met = true;
                for (const [reqId, reqCount] of Object.entries(upgrade.requirements)) {
                    if ((Game.state.buildings[reqId] || 0) < reqCount) {
                        met = false;
                        break;
                    }
                }
                if (!met) continue;
            }
            affordableAny = true;
            break;
        }

        btn.style.display = affordableAny ? '' : 'none';
        btn.disabled = !affordableAny;
    },
};

window.PrestigeUI = PrestigeUI;