Spry/website/Endpoints/AuroraCanvasEndpoint.vala

using Astralis;
using Invercargill;
using Invercargill.DataStructures;
using Inversion;
using Spry;

/**
 * AuroraCanvasEndpoint - Returns just the aurora waves for HTMX polling
 * 
 * This endpoint is polled every 5 seconds by the demo page.
 * It evolves the aurora state and returns fresh wave HTML.
 */
public class AuroraCanvasEndpoint : Component {
    
    private AuroraState aurora_state = inject<AuroraState>();
    private ComponentFactory factory = inject<ComponentFactory>();
    
    public override string markup { get {
        return """
        <spry-outlet sid="waves"/>
        """;
    }}
    
    public override async void prepare() throws Error {
        // Create wave components
        var waves = new Series<Renderable>();
        foreach (var wave in aurora_state.get_waves()) {
            var component = factory.create<AuroraWaveComponent>();
            component.y_offset = wave.y_offset;
            component.amplitude = wave.amplitude;
            component.frequency = wave.frequency;
            component.color1 = wave.color1;
            component.color2 = wave.color2;
            component.opacity = wave.opacity;
            component.animation_delay = wave.animation_delay;
            waves.add(component);
        }
        set_outlet_children("waves", waves);
    }
    
    public async override void handle_action(string action) throws Error {
        if (action == "Poll") {
            // Evolve the aurora naturally when polled
            aurora_state.evolve();
            // prepare() will be called automatically to render the waves
        }
    }
}