Spry/demo/DemoComponents/TodoListDemo.vala

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

/**
 * TodoListDemo - A todo list demo for the Outlets documentation
 * 
 * Demonstrates:
 * - Using spry-outlet for dynamic child components
 * - set_outlet_children() to populate outlets
 * - Parent/child component composition
 */
public class TodoListDemo : Component {
    
    private TodoDemoStore store = inject<TodoDemoStore>();
    private ComponentFactory factory = inject<ComponentFactory>();
    private HttpContext http_context = inject<HttpContext>();
    
    public override string markup { get {
        return """
        <div sid="todo-list" class="demo-todo-list">
            <div class="todo-header">
                <h3>Todo List</h3>
                <span class="todo-count" sid="count"></span>
            </div>
            <form class="todo-form" spry-action=":Add" spry-target="todo-list">
                <input type="text" name="title" placeholder="Add a task..." sid="input"/>
                <button type="submit" class="todo-add-btn">Add</button>
            </form>
            <ul class="todo-items" sid="items">
                <spry-outlet sid="items-outlet"/>
            </ul>
        </div>
        """;
    }}
    
    public override async void prepare() throws Error {
        // Update count
        this["count"].text_content = @"$(store.items.length) items";
        
        // Build list items
        var children = new Series<Renderable>();
        foreach (var item in store.items) {
            var component = factory.create<TodoItemDemo>();
            component.item_id = item.id;
            children.add(component);
        }
        set_outlet_children("items-outlet", children);
    }
    
    public async override void handle_action(string action) throws Error {
        if (action == "Add") {
            var title = http_context.request.query_params.get_any_or_default("title");
            if (title != null && title.strip().length > 0) {
                store.add(title.strip());
            }
        }
    }
}

/**
 * TodoItemDemo - Individual todo item component
 */
public class TodoItemDemo : Component {
    
    private TodoDemoStore store = inject<TodoDemoStore>();
    private HttpContext http_context = inject<HttpContext>();
    
    public int item_id { set; get; }
    
    public override string markup { get {
        return """
        <li sid="item" class="todo-item">
            <span sid="title" class="todo-title"></span>
            <button sid="toggle" spry-action=":Toggle" spry-target="item" 
                    class="todo-toggle"></button>
            <button sid="delete" spry-action=":Delete" spry-target="item"
                    hx-swap="delete" class="todo-delete">×</button>
        </li>
        """;
    }}
    
    public override async void prepare() throws Error {
        // If item_id is not set (fresh instance from action), try to get it from query params
        if (item_id == 0) {
            var id_str = http_context.request.query_params.get_any_or_default("id");
            if (id_str != null) {
                item_id = int.parse(id_str);
            }
        }
        
        var item = store.get_by_id(item_id);
        if (item == null) return;
        
        this["title"].text_content = item.title;
        this["item"].set_attribute("hx-vals", @"{\"id\":$item_id}");
        
        if (item.completed) {
            this["item"].add_class("completed");
            this["toggle"].text_content = "↩";
        } else {
            this["toggle"].text_content = "✓";
        }
    }
    
    public async override void handle_action(string action) throws Error {
        var id_str = http_context.request.query_params.get_any_or_default("id");
        var id = int.parse(id_str);
        
        switch (action) {
            case "Toggle":
                store.toggle(id);
                break;
            case "Delete":
                store.remove(id);
                break;
        }
    }
}

/**
 * TodoDemoStore - Singleton store for todo items
 */
public class TodoDemoStore : Object {
    
    public Series<TodoDemoItem> items { get; set; default = new Series<TodoDemoItem>(); }
    private int _next_id = 1;
    
    public TodoDemoStore() {
        // Add some initial items
        add("Learn Spry components");
        add("Build a web app");
        add("Deploy to production");
    }
    
    public void add(string title) {
        items.add(new TodoDemoItem(_next_id++, title));
    }
    
    public TodoDemoItem? get_by_id(int id) {
        foreach (var item in items) {
            if (item.id == id) return item;
        }
        return null;
    }
    
    public void toggle(int id) {
        var item = get_by_id(id);
        if (item != null) {
            item.completed = !item.completed;
        }
    }
    
    public void remove(int id) {
        // Build a new list without the item
        var new_items = new Series<TodoDemoItem>();
        foreach (var item in items) {
            if (item.id != id) {
                new_items.add(item);
            }
        }
        items = new_items;
    }
}

/**
 * TodoDemoItem - Single todo item data
 */
public class TodoDemoItem : Object {
    public int id { get; construct; }
    public string title { get; construct set; }
    public bool completed { get; set; default = false; }
    
    public TodoDemoItem(int id, string title) {
        Object(id: id, title: title);
    }
}