use axum::{extract::State, routing::get, Json, Router};
use serde::Serialize;
use serde_json::{json, Value};

#[derive(Serialize)]
pub struct DashboardMetricsResponse {
    kpis: Vec<Value>,
    trend_series: Vec<Value>,
    rev_series: Vec<Value>,
    lead_rows: Vec<Value>,
}

pub fn router() -> Router<crate::AppState> {
    Router::new().route("/metrics", get(get_metrics))
}

async fn get_metrics(State(state): State<crate::AppState>) -> Json<DashboardMetricsResponse> {
    // Return live scalar counts for Users, Companies, and Leads where possible
    let total_users: i64 = sqlx::query_scalar!("SELECT COUNT(*) FROM users")
        .fetch_one(&state.pool)
        .await
        .unwrap_or(Some(0))
        .unwrap_or(0);

    let active_companies: i64 = sqlx::query_scalar!("SELECT COUNT(*) FROM company_profiles WHERE status = 'APPROVED'")
        .fetch_one(&state.pool)
        .await
        .unwrap_or(Some(0))
        .unwrap_or(0);

    let open_leads: i64 = sqlx::query_scalar!("SELECT COUNT(*) FROM requirements WHERE status = 'PENDING_APPROVAL' OR status = 'APPROVED'")
        .fetch_one(&state.pool)
        .await
        .unwrap_or(Some(0))
        .unwrap_or(0);

    let kpis = vec![
        json!({ "id": "users", "title": "Total Users", "value": format!("{}", total_users), "trend": "-", "trendUp": true }),
        json!({ "id": "companies", "title": "Active Companies", "value": format!("{}", active_companies), "trend": "-", "trendUp": true }),
        json!({ "id": "leads", "title": "Open Leads", "value": format!("{}", open_leads), "trend": "-", "trendUp": true }),
        json!({ "id": "credits", "title": "Credits Purchased", "value": "$45,200", "trend": "+18%", "trendUp": true }),
    ];

    let trend_series = vec![
        json!({ "name": "Mon", "Freelancers": 40, "Agencies": 24 }),
        json!({ "name": "Tue", "Freelancers": 30, "Agencies": 13 }),
        json!({ "name": "Wed", "Freelancers": 20, "Agencies": 58 }),
        json!({ "name": "Thu", "Freelancers": 27, "Agencies": 39 }),
        json!({ "name": "Fri", "Freelancers": 18, "Agencies": 48 }),
        json!({ "name": "Sat", "Freelancers": 23, "Agencies": 38 }),
        json!({ "name": "Sun", "Freelancers": 34, "Agencies": 43 }),
    ];

    let rev_series = vec![
        json!({ "name": "Week 1", "Revenue": 4000, "Profit": 2400 }),
        json!({ "name": "Week 2", "Revenue": 3000, "Profit": 1398 }),
        json!({ "name": "Week 3", "Revenue": 2000, "Profit": 9800 }),
        json!({ "name": "Week 4", "Revenue": 2780, "Profit": 3908 }),
    ];

    let lead_rows = vec![
        json!({ "id": "L-1001", "client": "Acme Corp", "service": "Photography", "status": "Open", "value": "$1,200", "date": "Oct 24, 2023" }),
        json!({ "id": "L-1002", "client": "Stark Ind", "service": "Web Dev", "status": "In Progress", "value": "$4,500", "date": "Oct 23, 2023" }),
        json!({ "id": "L-1003", "client": "Wayne Ent", "service": "SEO", "status": "Closed", "value": "$800", "date": "Oct 22, 2023" }),
        json!({ "id": "L-1004", "client": "Daily Bugle", "service": "Copywriting", "status": "Open", "value": "$350", "date": "Oct 21, 2023" }),
    ];

    Json(DashboardMetricsResponse {
        kpis,
        trend_series: trend_series,
        rev_series: rev_series,
        lead_rows: lead_rows,
    })
}