use axum::{Json, http::StatusCode};
use serde_json::{json, Value};

use crate::cache::redis::get_redis_manager;


#[utoipa::path(
    get,
    path = "/health",
    tag = "misc",
    responses(
        (
            status = 200,
            description = "Completely Healthy",
            body = serde_json::Value,
            example = json!({
                "overall": "healthy",
                "services": {
                    "api": true,
                    "redis": true,
                }
            })
        ),
        (
            status = 503,
            description = "Unhealthy: one or more internal systems are unreachable/unhealthy.",
            body = serde_json::Value,
            example = json!({
                "overall": "unhealthy",
                "services": {
                    "api": true,
                    "redis": false,
                }
            })
        ),
    )
)]
pub async fn fetch_health_data() -> (StatusCode, Json<Value>) {
    let mut overall = "healthy";

    let api = true;

    let response: Option<String> = redis::cmd("PING").query_async(&mut get_redis_manager().await).await.ok();
    let redis_status: bool;
    if let Some("PONG") = response.as_deref() { redis_status = true; }
    else { redis_status = false; overall = "unhealthy"; }
    
    (
        if overall == "unhealthy" { StatusCode::SERVICE_UNAVAILABLE } else { StatusCode::OK },
        Json(json!({
            "overall": overall,
            "services": {
                "api": api,
                "redis": redis_status,
            }
        }))
    )
}