use chrono::{DateTime, Utc};
use serde::{Deserialize, Serialize};
use serde_json::Error;
use crate::metrics::Metrics;

pub mod metrics;

pub const MQTT_TOPIC: &str = "system/metrics";
pub const MQTT_SEND_INTERVAL: u64 = 5;

#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct StatusMessage {
    pub agent: String,
    pub metrics: Metrics,
    pub timestamp: DateTime<Utc>,
}

impl<'a> StatusMessage {
    pub fn new(agent: &'a str, metrics: Metrics) -> Self {
        Self {
            agent: agent.to_string(),
            metrics,
            timestamp: Utc::now(),
        }
    }

    pub fn to_string(&self) -> Result<String, Error> {
        serde_json::to_string_pretty(&self)
    }
}

impl<'a> TryFrom<&'a [u8]> for StatusMessage {
    type Error = serde_json::Error;

    fn try_from(value: &'a [u8]) -> Result<Self, Self::Error> {
        serde_json::from_slice(value)
    }
}

impl From<StatusMessage> for String {
    fn from(msg: StatusMessage) -> String {
        serde_json::to_string(&msg).unwrap_or_else(|_| String::new())
    }
}