// UI management and event handlers

var UI = {
    elements: {},
    
    init: function() {
        // Cache DOM elements
        this.elements = {
            totalMass: document.getElementById('total-mass'),
            spendableMass: document.getElementById('spendable-mass'),
	    totalLevel: document.getElementById('total-level'),
            asteroidLevel: document.getElementById('asteroid-level'),
            cometLevel: document.getElementById('comet-level'),
            planetLevel: document.getElementById('planet-level'),
            giantLevel: document.getElementById('giant-level'),
            asteroidUpgradeBtn: document.getElementById('asteroid-upgrade-btn'),
            cometUpgradeBtn: document.getElementById('comet-upgrade-btn'),
            planetUpgradeBtn: document.getElementById('planet-upgrade-btn'),
            giantUpgradeBtn: document.getElementById('giant-upgrade-btn'),
            gearIcon: document.getElementById('gear-icon'),
            settingsMenu: document.getElementById('settings-menu'),
            resetBtn: document.getElementById('reset-btn'),
	    leaderboardModal: document.getElementById('leaderboardModal'),
	    leaderboardToggle: document.getElementById('leaderboardToggle'),
	    leaderboardPanel: document.getElementById('leaderboardPanel'),
	    leaderboardList: document.getElementById('leaderboardList'),
	    sortMass: document.getElementById('sortMass'),
	    sortAge: document.getElementById('sortAge')
        };

	// Sorting buttons
	this.elements.sortMass.addEventListener('click', () => this.openLeaderboard('mass'));
	this.elements.sortAge.addEventListener('click', () => this.openLeaderboard('age'));

        this.setupEventListeners();
    },

    setupEventListeners: function() {
        const self = this;
        const gear = self.elements.gearIcon;
        const settingsMenu = self.elements.settingsMenu;
        const leaderboardToggle = self.elements.leaderboardToggle;
        const leaderboardPanel = self.elements.leaderboardPanel;
    
        // ---------- Settings Menu ----------
        if (gear && settingsMenu) {
            // Toggle settings menu
            gear.addEventListener('click', (e) => {
                e.stopPropagation(); // prevent document click from immediately closing
                settingsMenu.classList.toggle('open');
            });
    
            // Prevent clicks inside menu from closing it
            settingsMenu.addEventListener('click', (e) => {
                e.stopPropagation();
            });
        }
    
        // ---------- Leaderboard ----------
        if (leaderboardToggle && leaderboardPanel) {
            // Toggle leaderboard panel
            leaderboardToggle.addEventListener('click', (e) => {
                e.stopPropagation(); // prevent document click
                leaderboardPanel.classList.toggle('show');
    
                if (leaderboardPanel.classList.contains('show')) {
                    self.openLeaderboard('mass'); // load leaderboard by mass immediately
                }
            });
    
            // Prevent clicks inside the panel from closing it
            leaderboardPanel.addEventListener('click', (e) => {
                e.stopPropagation();
            });
        }
    
        // ---------- Click outside to close ----------
        document.addEventListener('click', () => {
            // Close settings menu
            if (settingsMenu) {
                settingsMenu.classList.remove('open');
            }
    
            // Close leaderboard panel
            if (leaderboardPanel) {
                leaderboardPanel.classList.remove('show');
            }
        });
    },

    setUpgradeHandlers: function(handlers) {
        this.elements.asteroidUpgradeBtn.addEventListener('click', handlers.asteroid);
        this.elements.cometUpgradeBtn.addEventListener('click', handlers.comet);
        this.elements.planetUpgradeBtn.addEventListener('click', handlers.planet);
        this.elements.giantUpgradeBtn.addEventListener('click', handlers.giant);
    },
    
    update: function(gameState, config) {
	if (this.elements.spendableMass) {
            this.elements.spendableMass.textContent = 
                'Available to Spend: ' + this.formatMass(gameState.totalMassConsumed);
       }
        this.updateMassDisplay(gameState, config);
        this.updateUpgradeDisplay(gameState);
	this.updateTotalLevel(gameState);
    },
    
    updateMassDisplay: function(state, config) {
        // Format rates
        const rateShortText = this.formatMass(state.rateShort) + '/s';
        const rateMediumText = this.formatMass(state.rateMedium * 3600) + '/h';
        const rateLongText = this.formatMass(state.rateLong * 86400) + '/d';
    
        // Use span with class based on trend
        const rateText = `
            <span class="${'rate-' + (state.prevRateShortTrend || 'same')}">${rateShortText}</span>, 
            <span class="${'rate-' + (state.prevRateMediumTrend || 'same')}">${rateMediumText}</span>, 
            <span class="${'rate-' + (state.prevRateLongTrend || 'same')}">${rateLongText}</span>
        `;
    
        const bhMassText = this.formatMass(state.blackHoleTotalMass, { forceSolarMass: true });
        const consumedText = this.formatMass(state.totalMassConsumedEver);
    
        this.elements.totalMass.innerHTML = `
            <span class="tooltip-trigger">
                Black Hole Mass: ${bhMassText}
                <span class="tooltip">
                    The mass of your black hole in solar masses.<br>
                    1 Solar Mass (M☉) ≈ 1.989 × 10³⁰ kg.<br><br>
                    Total mass absorbed:<br>
                    ${consumedText}
                </span>
            </span><br>
            <span style="font-size:10px; opacity:0.7;">Rate: ${rateText}</span>
        `;
    },

    updateUpgradeDisplay: function(gameState) {
        this.updateAsteroidUpgrade(gameState);
        this.updateCometUpgrade(gameState);
        this.updatePlanetUpgrade(gameState);
        this.updateGiantUpgrade(gameState);
    },
    updateTotalLevel: function(gameState) {
	    var el = this.elements.totalLevel;
	    if (!el) return;
	
	    var totalLevel =
	        gameState.asteroidUpgradeLevel +
	        gameState.cometUpgradeLevel +
	        gameState.planetUpgradeLevel +
	        gameState.giantUpgradeLevel;
	
	    el.innerHTML =
	        '<span class="tooltip-trigger">' +
	            'Total Level: ' + totalLevel +
	            '<span class="tooltip">' +
	                'Sum of all upgrades.<br>'
	            '</span>' +
	        '</span>';
    },

    
    updateAsteroidUpgrade: function(gameState) {
        var rate = (1 / gameState.currentAsteroidSpawnInterval * 1000).toFixed(2);
        var bonusPercent = (gameState.asteroidUpgradeLevel * 10);
        var tooltipText = 'Rate: ' + rate + '/sec   <br>Bonus: ' + bonusPercent + '%';
        
        this.elements.asteroidLevel.innerHTML = '<span class="tooltip-trigger">Asteroids: Level ' + 
            gameState.asteroidUpgradeLevel + 
            '<span class="tooltip">' + tooltipText + '</span></span>';
        
	this.elements.asteroidUpgradeBtn.textContent =
            'Upgrade (Cost: ' + this.formatMass(gameState.asteroidUpgradeCost) + ')';

        this.elements.asteroidUpgradeBtn.disabled = 
            gameState.totalMassConsumed < gameState.asteroidUpgradeCost;
    },
    
    updateCometUpgrade: function(gameState) {
        var rate = (1 / gameState.currentCometSpawnInterval * 60000).toFixed(2);
        var bonusPercent = (gameState.cometUpgradeLevel * 10);
        var tooltipText = 'Rate: ' + rate + '/min   <br>Bonus: ' + bonusPercent + '%';
        
        this.elements.cometLevel.innerHTML = '<span class="tooltip-trigger">Comets: Level ' + 
            gameState.cometUpgradeLevel + 
            '<span class="tooltip">' + tooltipText + '</span></span>';
        
	this.elements.cometUpgradeBtn.textContent =
	    'Upgrade (Cost: ' + this.formatMass(gameState.cometUpgradeCost) + ')';

        this.elements.cometUpgradeBtn.disabled = 
            gameState.totalMassConsumed < gameState.cometUpgradeCost;
    },
    
    updatePlanetUpgrade: function(gameState) {
        var rate = (3600000 / gameState.currentPlanetSpawnInterval).toFixed(2);
        var bonusPercent = (gameState.planetUpgradeLevel * 10);
        var tooltipText = 'Rate: ' + rate + '/hour   <br>Bonus: ' + bonusPercent + '%';
        
        this.elements.planetLevel.innerHTML = '<span class="tooltip-trigger">Planets: Level ' + 
            gameState.planetUpgradeLevel + 
            '<span class="tooltip">' + tooltipText + '</span></span>';
        
	this.elements.planetUpgradeBtn.textContent =
	    'Upgrade (Cost: ' + this.formatMass(gameState.planetUpgradeCost) + ')';

        this.elements.planetUpgradeBtn.disabled = 
            gameState.totalMassConsumed < gameState.planetUpgradeCost;
    },
    
    updateGiantUpgrade: function(gameState) {
        var rate = (21600000 / gameState.currentGiantSpawnInterval).toFixed(2);
        var bonusPercent = (gameState.giantUpgradeLevel * 10);
        var tooltipText = 'Spawn Rate: ' + rate + '/6hours   <br>Bonus: ' + bonusPercent + '%';
        
        this.elements.giantLevel.innerHTML = '<span class="tooltip-trigger">Giants: Level ' + 
            gameState.giantUpgradeLevel + 
            '<span class="tooltip">' + tooltipText + '</span></span>';
        
	this.elements.giantUpgradeBtn.textContent =
	    'Upgrade (Cost: ' + this.formatMass(gameState.giantUpgradeCost) + ')';

        this.elements.giantUpgradeBtn.disabled = 
            gameState.totalMassConsumed < gameState.giantUpgradeCost;
    },
    
    formatMass: function(massKg, options = {}) {
        // If forcing solar mass display (for black hole)
        if (options.forceSolarMass) {
            var solarMasses = massKg / CONFIG.SOLAR_MASS_KG;
            return solarMasses.toFixed(3) + ' M☉';
        }
    
        // Traditional engineering/astronomical units
        if (massKg >= 1e18) {
            return (massKg / 1e18).toFixed(2) + ' Et'; // Exatonnes
        }
        if (massKg >= 1e15) {
            return (massKg / 1e15).toFixed(2) + ' Pt'; // Petatonnes
        }
        if (massKg >= 1e12) {
            return (massKg / 1e12).toFixed(2) + ' Tt'; // Teratonnes
        }
        if (massKg >= 1e9) {
            return (massKg / 1e9).toFixed(2) + ' Gt'; // Gigatonnes
        }
        if (massKg >= 1e6) {
            return (massKg / 1e6).toFixed(2) + ' Mt'; // Megatonnes
        }
        if (massKg >= 1e3) {
            return (massKg / 1e3).toFixed(2) + ' tonnes'; // Tonnes
        }
        return massKg.toFixed(0) + ' kg'; // Kilograms
    },

    formatTime: function(ms) {
        var seconds = Math.floor(ms / 1000);
        var minutes = Math.floor(seconds / 60);
        var hours = Math.floor(minutes / 60);
        var days = Math.floor(hours / 24);
        
        if (days > 0) {
            return days + 'd ' + (hours % 24) + 'h';
        } else if (hours > 0) {
            return hours + 'h ' + (minutes % 60) + 'm';
        } else if (minutes > 0) {
            return minutes + 'm ' + (seconds % 60) + 's';
        } else {
            return seconds + 's';
        }
    },
    
    formatAge: function(ms) {
        var days = Math.floor(ms / (24 * 60 * 60 * 1000));
        var hours = Math.floor((ms % (24 * 60 * 60 * 1000)) / (60 * 60 * 1000));
        
        if (days > 0) {
            return days + 'd ' + hours + 'h old';
        } else if (hours > 0) {
            return hours + 'h old';
        } else {
            return 'New';
        }
    },
    

	openLeaderboard: async function(sortBy = 'mass') {
	    const container = this.elements.leaderboardList;
	    container.innerHTML = '<div style="text-align:center; padding:20px;">Loading...</div>';
	    
	    // Fetch leaderboard
	    let data = await Server.getLeaderboard(sortBy);
	    if (!data.length) {
	        container.innerHTML = '<div style="text-align:center; padding:20px;">No entries yet</div>';
	        return;
	    }
	    
	    // Sort data server-side should already be sorted; else fallback:
	    data.sort((a,b) => sortBy==='mass'?b.mass-a.mass:b.holeAge-a.holeAge);
	    const localPlayerId = Server.playerId; // your local player ID
	    
	    // Build entries
	    let html = '';
	    data.forEach((entry, i) => {
	        const rank = i + 1;
	        const medal = rank===1?'🥇':rank===2?'🥈':rank===3?'🥉':rank+'.';
	        const isLocal = entry.id === localPlayerId;
	        
	        // Online indicator (green dot if active in last 15 min)
	        const onlineIndicator = entry.isOnline ? '<span class="online-indicator"></span>' : '';
	        const nameSuffix = isLocal ? '💗' : '';
	        
	        // Use last 5 chars of playerId if available, otherwise fallback
	        const displayName = entry.id
	            ? entry.id.slice(-5)
	            : 'Anon';
	        
	        html += `<div class="leaderboard-entry${isLocal ? ' local-player' : ''}">
	            <span class="rank">${medal}</span>
	            <span class="name">${this.escapeHtml(displayName)}${onlineIndicator}${nameSuffix}</span>
	            <span class="value mass${sortBy==='mass'?' sorted':''}">${this.formatMass(entry.mass,{forceSolarMass:true})}</span>
	            <span class="value age${sortBy==='age'?' sorted':''}">${this.formatAge(entry.holeAge)}</span>
	        </div>`;
	    });
	    container.innerHTML = html;
	},

    escapeHtml: function(text) {
        if (!text) return '';
        return text
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;')
            .replace(/'/g, '&#039;');
    }
};