use dioxus::prelude::*;

use crate::infrastructure::ollama::{get_ollama_status, OllamaStatus};

/// Right sidebar for the dashboard, showing Ollama status, trending topics,
/// and recent search history.
///
/// Appears when no article card is selected. Disappears when the user opens
/// the article detail split view.
///
/// # Props
///
/// * `ollama_url` - Ollama instance URL for status polling
/// * `trending` - Trending topic keywords extracted from recent news headlines
/// * `recent_searches` - Recent search topics stored in localStorage
/// * `on_topic_click` - Fires when a trending or recent topic is clicked
#[component]
pub fn DashboardSidebar(
    ollama_url: String,
    trending: Vec<String>,
    recent_searches: Vec<String>,
    on_topic_click: EventHandler<String>,
) -> Element {
    // Fetch Ollama status once on mount.
    // use_resource with no signal dependencies runs exactly once and
    // won't re-fire on parent re-renders (unlike use_effect).
    let url = ollama_url.clone();
    let status_resource = use_resource(move || {
        let u = url.clone();
        async move {
            get_ollama_status(u).await.unwrap_or(OllamaStatus {
                online: false,
                models: Vec::new(),
            })
        }
    });

    let current_status: OllamaStatus =
        status_resource
            .read()
            .as_ref()
            .cloned()
            .unwrap_or(OllamaStatus {
                online: false,
                models: Vec::new(),
            });

    rsx! {
        aside { class: "dashboard-sidebar",

            // -- Ollama Status Section --
            div { class: "sidebar-section",
                h4 { class: "sidebar-section-title", "Ollama Status" }
                div { class: "sidebar-status-row",
                    span { class: if current_status.online { "sidebar-status-dot sidebar-status-dot--online" } else { "sidebar-status-dot sidebar-status-dot--offline" } }
                    span { class: "sidebar-status-label",
                        if current_status.online {
                            "Online"
                        } else {
                            "Offline"
                        }
                    }
                }
                if !current_status.models.is_empty() {
                    div { class: "sidebar-model-list",
                        for model in current_status.models.iter() {
                            span { class: "sidebar-model-tag", "{model}" }
                        }
                    }
                }
            }

            // -- Trending Topics Section --
            if !trending.is_empty() {
                div { class: "sidebar-section",
                    h4 { class: "sidebar-section-title", "Trending" }
                    for topic in trending.iter() {
                        {
                            let t = topic.clone();
                            rsx! {
                                button {
                                    class: "sidebar-topic-link",
                                    onclick: move |_| on_topic_click.call(t.clone()),
                                    "{topic}"
                                }
                            }
                        }
                    }
                }
            }

            // -- Recent Searches Section --
            if !recent_searches.is_empty() {
                div { class: "sidebar-section",
                    h4 { class: "sidebar-section-title", "Recent Searches" }
                    for search in recent_searches.iter() {
                        {
                            let s = search.clone();
                            rsx! {
                                button {
                                    class: "sidebar-topic-link",
                                    onclick: move |_| on_topic_click.call(s.clone()),
                                    "{search}"
                                }
                            }
                        }
                    }
                }
            }
        }
    }
}