use dioxus::prelude::*;

use crate::components::page_header::PageHeader;
use crate::infrastructure::graph::fetch_impact;

#[component]
pub fn ImpactAnalysisPage(repo_id: String, finding_id: String) -> Element {
    let impact_data = use_resource(move || {
        let rid = repo_id.clone();
        let fid = finding_id.clone();
        async move { fetch_impact(rid, fid).await.ok() }
    });

    rsx! {
        PageHeader {
            title: "Impact Analysis",
            description: "Blast radius and affected entry points for a security finding",
        }

        div { class: "card",
            match &*impact_data.read() {
                Some(Some(resp)) => {
                    let impact = resp.data.clone().unwrap_or_default();
                    rsx! {
                        div { class: "grid grid-cols-2 gap-4 mb-4",
                            div { class: "stat-card",
                                div { class: "stat-value",
                                    "{impact.get(\"blast_radius\").and_then(|v| v.as_u64()).unwrap_or(0)}"
                                }
                                div { class: "stat-label", "Blast Radius (nodes affected)" }
                            }
                            div { class: "stat-card",
                                div { class: "stat-value",
                                    "{impact.get(\"affected_entry_points\").and_then(|v| v.as_array()).map(|a| a.len()).unwrap_or(0)}"
                                }
                                div { class: "stat-label", "Entry Points Affected" }
                            }
                        }

                        h3 { "Affected Entry Points" }
                        if let Some(entries) = impact.get("affected_entry_points").and_then(|v| v.as_array()) {
                            if entries.is_empty() {
                                p { class: "text-muted", "No entry points affected." }
                            } else {
                                ul { class: "list",
                                    for entry in entries {
                                        li { "{entry.as_str().unwrap_or(\"-\")}" }
                                    }
                                }
                            }
                        }

                        h3 { class: "mt-4", "Call Chains" }
                        if let Some(chains) = impact.get("call_chains").and_then(|v| v.as_array()) {
                            if chains.is_empty() {
                                p { class: "text-muted", "No call chains found." }
                            } else {
                                for (i, chain) in chains.iter().enumerate() {
                                    div { class: "card mb-2",
                                        strong { "Chain {i + 1}: " }
                                        if let Some(steps) = chain.as_array() {
                                            for (j, step) in steps.iter().enumerate() {
                                                span { "{step.as_str().unwrap_or(\"-\")}" }
                                                if j < steps.len() - 1 {
                                                    span { class: "text-muted", " → " }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }

                        h3 { class: "mt-4", "Direct Callers" }
                        if let Some(callers) = impact.get("direct_callers").and_then(|v| v.as_array()) {
                            if callers.is_empty() {
                                p { class: "text-muted", "No direct callers." }
                            } else {
                                ul { class: "list",
                                    for caller in callers {
                                        li { code { "{caller.as_str().unwrap_or(\"-\")}" } }
                                    }
                                }
                            }
                        }
                    }
                },
                Some(None) => rsx! {
                    p { "No impact analysis data available for this finding." }
                },
                None => rsx! {
                    p { "Loading impact analysis..." }
                },
            }
        }
    }
}