use crate::TopBar;
use chrono::{Local, Timelike};
use slint::{ComponentHandle, SharedString, Timer, TimerMode};
use std::process::{Child, Command};
use std::time::Duration;

fn run_cmd(cmd: &str) -> Option<Child> {
    Command::new(cmd).spawn().ok()
}

fn format_time() -> String {
    Local::now().format("%I:%M %p").to_string()
}

fn time_until_next_minute() -> Duration {
    let now = Local::now();
    let secs = now.second();
    let nanos = now.nanosecond();

    Duration::from_secs(60 - u64::from(secs)) - Duration::from_nanos(u64::from(nanos))
}

fn start_clock_updater(ui: &TopBar) {
    let weak = ui.as_weak();

    // One-shot timer for the first update
    let initial_timer = Box::leak(Box::new(Timer::default()));

    // Repeating timer (every 60 seconds)
    let repeating_timer = Box::leak(Box::new(Timer::default()));

    // 1. Initial immediate update
    if let Some(ui) = weak.upgrade() {
        ui.set_time_text(SharedString::from(format_time()));
    }

    // 2. Schedule first update exactly at next minute boundary
    initial_timer.start(TimerMode::SingleShot, time_until_next_minute(), move || {
        // Update at the boundary
        if let Some(ui) = weak.upgrade() {
            ui.set_time_text(SharedString::from(format_time()));
        }

        // 3. Start repeating 60-sec timer
        let weak_clone = weak.clone();
        repeating_timer.start(TimerMode::Repeated, Duration::from_secs(60), move || {
            if let Some(ui) = weak_clone.upgrade() {
                ui.set_time_text(SharedString::from(format_time()));
            }
        });
    });
}

pub fn install_callbacks(ui: &TopBar) {
    let weak = ui.as_weak();

    // Click handler 
    ui.on_show_clock(move || {
        if weak.upgrade().is_some() {
            run_cmd("xclock");
        }
    });

    // Start the time-updating timer
    start_clock_updater(ui);
}