Writing a Multisynq View

class GameView extends Multisynq.View {
    init() {
        this.model = this.wellKnownModel("GameModel");
        this.setupUI();
        this.startRenderLoop();
        
        // Subscribe to model events
        this.subscribe("game", "state-changed", this.updateDisplay);
        this.subscribe("game", "player-joined", this.addPlayerToUI);
        this.subscribe("game", "player-left", this.removePlayerFromUI);
    }
    
    setupUI() {
        this.canvas = document.getElementById('gameCanvas');
        this.ctx = this.canvas.getContext('2d');
        
        // ✅ Handle user input by publishing events
        this.canvas.addEventListener('click', (event) => {
            const rect = this.canvas.getBoundingClientRect();
            const x = event.clientX - rect.left;
            const y = event.clientY - rect.top;
            
            // ✅ Publish event for model to handle
            this.publish("input", "player-click", { x, y });
        });
        
        this.canvas.addEventListener('keydown', (event) => {
            // ✅ Send input events to model
            this.publish("input", "key-press", { 
                key: event.key,
                timestamp: Date.now() // View can use real time
            });
        });
    }
    
    startRenderLoop() {
        // ✅ Views can use setTimeout/setInterval
        this.renderFrame();
    }
    
    renderFrame() {
        // ✅ Read directly from model for efficiency
        this.drawBackground();
        this.drawPlayers();
        this.drawUI();
        
        // Continue render loop
        requestAnimationFrame(() => this.renderFrame());
    }
    
    drawPlayers() {
        // ✅ Read model state directly
        const players = this.model.players;
        
        this.ctx.clearRect(0, 0, this.canvas.width, this.canvas.height);
        
        for (const [playerId, player] of players) {
            this.ctx.fillStyle = player.color;
            this.ctx.fillRect(
                player.position.x - 10,
                player.position.y - 10,
                20, 20
            );
            
            // Draw player name
            this.ctx.fillStyle = 'white';
            this.ctx.fillText(
                player.name,
                player.position.x,
                player.position.y - 15
            );
        }
    }
    
    updateDisplay() {
        // ✅ React to model changes
        this.updateScore();
        this.updateGameState();
    }
    
    updateScore() {
        const scoreElement = document.getElementById('score');
        if (scoreElement) {
            // ✅ Read from model to update UI
            scoreElement.textContent = `Score: ${this.model.score}`;
        }
    }
}

GameView.register("GameView");

class PerformantGameView extends Multisynq.View {
    init() {
        this.model = this.wellKnownModel("GameModel");
        this.canvas = document.getElementById('canvas');
        this.ctx = this.canvas.getContext('2d');
        
        // Track what needs updating
        this.dirtyRegions = new Set();
        this.lastModelState = null;
        
        this.startRenderLoop();
        
        // Listen for specific model changes
        this.subscribe("game", "player-moved", this.markPlayerDirty);
        this.subscribe("game", "object-changed", this.markObjectDirty);
    }
    
    startRenderLoop() {
        this.renderFrame();
    }
    
    renderFrame() {
        // Only update if model changed
        if (this.hasModelChanged()) {
            this.updateChangedElements();
            this.lastModelState = this.getModelSnapshot();
        }
        
        requestAnimationFrame(() => this.renderFrame());
    }
    
    hasModelChanged() {
        // Efficient change detection
        const currentState = this.getModelSnapshot();
        return JSON.stringify(currentState) !== JSON.stringify(this.lastModelState);
    }
    
    getModelSnapshot() {
        // Create lightweight state snapshot
        return {
            playerCount: this.model.players.size,
            gameState: this.model.gameState,
            lastUpdate: this.model.lastUpdateTime
        };
    }
    
    updateChangedElements() {
        // Only redraw changed regions
        for (const region of this.dirtyRegions) {
            this.redrawRegion(region);
        }
        this.dirtyRegions.clear();
    }
    
    markPlayerDirty(data) {
        this.dirtyRegions.add(`player-${data.playerId}`);
    }
    
    markObjectDirty(data) {
        this.dirtyRegions.add(`object-${data.objectId}`);
    }
    
    redrawRegion(region) {
        // Efficient partial redraws
        if (region.startsWith('player-')) {
            const playerId = region.replace('player-', '');
            this.drawPlayer(playerId);
        } else if (region.startsWith('object-')) {
            const objectId = region.replace('object-', '');
            this.drawObject(objectId);
        }
    }
}

PerformantGameView.register("PerformantGameView");

class ProperView extends Multisynq.View {
    init() {
        // ✅ UI management
        this.setupUserInterface();
        
        // ✅ Input handling
        this.setupInputHandlers();
        
        // ✅ Display updates
        this.startRenderLoop();
        
        // ✅ Animation and effects
        this.setupAnimations();
        
        // ✅ Browser API access
        this.setupAudio();
        this.setupLocalStorage();
        
        // ✅ External libraries
        this.setupThreeJS();
        this.setupChartJS();
    }
    
    handleUserInput() {
        // ✅ Convert input to events
        this.publish("input", "user-action", data);
    }
    
    updateDisplay() {
        // ✅ Read model state and update visuals
        const gameState = this.model.gameState;
        this.renderGameState(gameState);
    }
    
    playSound(soundName) {
        // ✅ Views can use browser APIs
        const audio = new Audio(`sounds/${soundName}.mp3`);
        audio.play();
    }
}