//! Wizard UI for installation process

use anyhow::Result;
use native_windows_gui as nwg;
use native_windows_derive as nwd;

use crate::{install_wintun_dll, service, firewall};

#[derive(Default, nwd::NwgUi)]
pub struct InstallerWizard {
    #[nwg_control(size: (600, 400), position: (300, 300), title: "OSTP Installer", flags: "WINDOW|VISIBLE")]
    #[nwg_events(OnWindowClose: [InstallerWizard::exit])]
    window: nwg::Window,

    #[nwg_layout(parent: window, spacing: 1)]
    grid: nwg::GridLayout,

    #[nwg_control(text: "Welcome to OSTP Installer", font: Some(&data.title_font))]
    #[nwg_layout_item(layout: grid, row: 0, col: 0, col_span: 2)]
    title: nwg::Label,

    #[nwg_control(text: "This wizard will install OSTP VPN on your system.\n\nClick Next to continue.")]
    #[nwg_layout_item(layout: grid, row: 1, col: 0, col_span: 2, row_span: 4)]
    description: nwg::Label,

    #[nwg_control(text: "Next")]
    #[nwg_layout_item(layout: grid, row: 5, col: 1)]
    #[nwg_events(OnButtonClick: [InstallerWizard::next])]
    next_button: nwg::Button,

    #[nwg_control(text: "Cancel")]
    #[nwg_layout_item(layout: grid, row: 5, col: 0)]
    #[nwg_events(OnButtonClick: [InstallerWizard::exit])]
    cancel_button: nwg::Button,

    #[nwg_resource(family: "Segoe UI", size: 18, weight: 700)]
    title_font: nwg::Font,

    step: std::cell::RefCell<usize>,
}

impl InstallerWizard {
    fn next(&self) {
        let mut step = self.step.borrow_mut();
        *step += 1;

        match *step {
            1 => self.install_step(),
            2 => self.finish_step(),
            _ => {}
        }
    }

    fn install_step(&self) {
        self.title.set_text("Installing...");
        self.description.set_text("Please wait while OSTP is being installed.");
        self.next_button.set_enabled(false);

        // Perform installation
        std::thread::spawn(move || {
            if let Err(e) = perform_installation() {
                eprintln!("Installation error: {}", e);
            }
        });
    }

    fn finish_step(&self) {
        self.title.set_text("Installation Complete");
        self.description.set_text("OSTP has been successfully installed.\n\nClick Finish to exit.");
        self.next_button.set_text("Finish");
    }

    fn exit(&self) {
        nwg::stop_thread_dispatch();
    }
}

pub fn run_wizard() -> Result<()> {
    nwg::init()?;
    nwg::Font::set_global_family("Segoe UI")?;

    let _app = InstallerWizard::default();
    nwg::dispatch_thread_events();

    Ok(())
}

fn perform_installation() -> Result<()> {
    tracing::info!("Step 1: Installing Wintun DLL");
    install_wintun_dll()?;

    tracing::info!("Step 2: Registering Windows Service");
    service::install_service()?;

    tracing::info!("Step 3: Configuring Firewall");
    firewall::add_firewall_rules()?;

    tracing::info!("Installation complete");
    Ok(())
}