use crate::handlers::dbus_plasma_interface;
use crate::Wallpapers;

use dbus::blocking::Connection;
use std::fmt::Write as _;
use std::time::Duration;

pub fn change_wallpapers(wallpapers: &Wallpapers) {
    // First open up a connection to the session bus
    let conn = Connection::new_session().unwrap();

    // Second, create a wrapper struct around the connection that makes it easy
    // to send method calls to a specific destination and path.
    let proxy = conn.with_proxy(
        "org.kde.plasmashell",
        "/PlasmaShell",
        Duration::from_millis(5000),
    );

    use dbus_plasma_interface::OrgKdePlasmaShell;

    let javascript = generate_js(wallpapers);
    let resp = proxy.evaluate_script(javascript.as_ref());
    match resp {
        Ok(_str) => {}
        Err(e) => println!("{}", e),
    }
}

pub fn generate_js(wallpapers: &Wallpapers) -> String {
    let mut javascript = String::new();
    javascript.push_str("var allDesktops = desktops();\n");
    for (count, monitor) in wallpapers.config.monitors.monitors.iter().enumerate() {
        let mut boilerplate = String::new();
        let _ = write!(
            &mut boilerplate,
            "
        allDesktops[{0}].wallpaperPlugin = 'org.kde.image';
        allDesktops[{0}].currentConfigGroup = Array('Wallpaper', 'org.kde.image', 'General');
        allDesktops[{0}].writeConfig('Image', 'file://{1}');
        ",
            count,
            wallpapers.random_selection(&monitor.monitor_type)
        );
        javascript.push_str(&boilerplate);
    }
    javascript
}