use crate::Error;

use sysinfo::System;
use uptime_lib::get;
use std::time::{
  Duration,
  SystemTime,
  UNIX_EPOCH
};

/// Retrieve host and bot uptimes
#[poise::command(slash_command)]
pub async fn uptime(ctx: poise::Context<'_, (), Error>) -> Result<(), Error> {
  let mut sys = System::new_all();
  sys.refresh_all();

  // Fetch system's uptime
  let sys_uptime = get().unwrap().as_secs();

  // Fetch bot's process uptime
  let curr_pid = sysinfo::get_current_pid().unwrap();
  let now = SystemTime::now();
  let mut proc_uptime = 0;
  if let Some(process) = sys.process(curr_pid) {
    let time_started = UNIX_EPOCH + Duration::from_secs(process.start_time());
    proc_uptime = now.duration_since(time_started).unwrap().as_secs();
  }

  ctx.reply(format!("System: `{}`\nProcess: `{}`", format_duration(sys_uptime), format_duration(proc_uptime))).await?;
  Ok(())
}

fn format_duration(secs: u64) -> String {
  let days = secs / 86400;
  let hours = (secs % 86400) / 3600;
  let minutes = (secs % 3600) / 60;
  let seconds = secs % 60;

  let mut formatted_string = String::new();
  if days > 0 {
    formatted_string.push_str(&format!("{}d, ", days));
  }
  if hours > 0 || days > 0 {
    formatted_string.push_str(&format!("{}h, ", hours));
  }
  if minutes > 0 || hours > 0 {
    formatted_string.push_str(&format!("{}m, ", minutes));
  }
  formatted_string.push_str(&format!("{}s", seconds));

  formatted_string
}