use crate::queries::{ListTodos, Todo};
use livevue_rs::{RenderContext, global, mangle};
use maud::{html, Markup};

pub async fn todo_list(cx: &mut RenderContext) -> anyhow::Result<Markup> {
    // Fetch all todos (registers CacheKey::Table { table: "todos" })
    let todos = cx.run(ListTodos).await?;

    // Read the clock from KV (registers CacheKey::Channel { key: "clock" })
    let clock = cx
        .kv_run("clock")
        .await
        .and_then(|v| v.as_str().map(|s| s.to_string()))
        .unwrap_or_else(|| "—".to_string());

    let new_todo = cx.signal("newTodo", global());

    let todo_count = todos.len();
    let done_count = todos.iter().filter(|t| t.completed).count();

    Ok(html! {
        div.todo-app {
            h1 { "LiveVue.rs — Todo List" }

            nav {
                span.nav-current { "Todos" }
                " | "
                button.nav-link
                    data-on:click="$tree = {page: 'About'}" {
                    "About"
                }
            }

            p.clock { "🕐 " (clock) }

            div.add-form {
                input
                    type="text"
                    placeholder="What needs to be done?"
                    data-bind="newTodo"
                    ;
                button
                    data-on:click="@post('/action/add_todo')"
                    data-attr=(format!("{{disabled: {}.trim() === ''}}", new_todo.val)) {
                    "Add"
                }
            }

            p.stats {
                (format!("{} items, {} completed", todo_count, done_count))
            }

            ul.todo-list {
                @for todo in &todos {
                    (todo_item(cx, todo))
                }
            }

            @if todos.is_empty() {
                p.empty { "No todos yet. Add one above!" }
            }
        }
    })
}

fn todo_item(cx: &mut RenderContext, todo: &Todo) -> Markup {
    let _editing = cx.signal("editing", mangle(todo.id).client_only());

    let title_class = if todo.completed {
        "todo-title completed"
    } else {
        "todo-title"
    };

    html! {
        li.todo-item id=(format!("todo-{}", todo.id)) {
            input
                type="checkbox"
                checked[todo.completed]
                data-on:click=(format!("@post('/action/toggle_todo?id={}')", todo.id))
                ;
            span class=(title_class) { (todo.title) }
            button.delete-btn
                data-on:click=(format!("@post('/action/delete_todo?id={}')", todo.id)) {
                "×"
            }
        }
    }
}