// file: crates/ksp-app-config-desk/src/tw_splash.rs
// version: 5

//! Tauri-window lifecycle for the Config Desk splash window.

use tauri::Emitter; // rust-rules: trait-import
use tauri::Manager; // rust-rules: trait-import

/// Crate-internal `WINDOW_LABEL_SPLASH` constant.
pub(crate) const WINDOW_LABEL_SPLASH: &str = "splash";

const SPLASH_EVENT_NAME: &str = "ksp-splash-order";

/// Resolves the required splash window or returns a typed error.
pub(crate) fn require_splash_window(manager: &impl Manager<tauri::Wry>) -> ksp_core_lib::Result<tauri::WebviewWindow> {
    let window = manager.get_webview_window(WINDOW_LABEL_SPLASH);
    return match window {
        std::option::Option::Some(value) => std::result::Result::Ok(value),
        std::option::Option::None => std::result::Result::Err(
            ksp_core_lib::Error::new(crate::ERROR_CODE_TAURI_WINDOW_MISSING, "Config Desk splash window is missing")
                .with_context("window_label", WINDOW_LABEL_SPLASH),
        ),
    };
}

/// Executes the crate-internal splash frontend ready service operation for the owning module.
pub(crate) async fn splash_frontend_ready_service(
    app: tauri::AppHandle,
    invoking_window: tauri::WebviewWindow,
    state: &crate::AppState,
) -> ksp_core_lib::Result<()> {
    if invoking_window.label() != WINDOW_LABEL_SPLASH {
        return std::result::Result::Err(
            ksp_core_lib::Error::new(crate::ERROR_CODE_SPLASH_ORIGIN_INVALID, "Splash readiness may only originate from the splash window")
                .with_context("window_label", invoking_window.label()),
        );
    }
    if !state.begin_splash_sequence() {
        ksp_logging_lib::trace!(
            target: crate::TRACING_TARGET,
            domain = crate::TRACING_DOMAIN_WINDOWS,
            window_label = WINDOW_LABEL_SPLASH,
            "duplicate splash frontend readiness ignored"
        );
        return std::result::Result::Ok(());
    }
    let settings = state.splash_settings();
    let lifecycle_started = std::time::Instant::now();
    ksp_logging_lib::debug!(
        target: crate::TRACING_TARGET,
        domain = crate::TRACING_DOMAIN_WINDOWS,
        window_label = WINDOW_LABEL_SPLASH,
        minimum_ms = settings.minimum_ms(),
        minimum_source = settings.minimum_source(),
        fade_ms = settings.fade_ms(),
        fade_source = settings.fade_source(),
        expected_backend_lifecycle_ms = settings.expected_backend_lifecycle_ms(),
        "splash frontend readiness accepted; starting splash to main lifecycle"
    );
    let fade_in = emit_order(
        &invoking_window,
        crate::SplashOrderDto::new("fade_in", std::option::Option::Some("Initialisation de KSP Config Desk..."), std::option::Option::Some(settings.fade_ms())),
    );
    if let std::result::Result::Err(error) = fade_in {
        return std::result::Result::Err(error);
    }
    let minimum_wait_started = std::time::Instant::now();
    tokio::time::sleep(std::time::Duration::from_millis(settings.minimum_ms())).await;
    ksp_logging_lib::debug!(
        target: crate::TRACING_TARGET,
        domain = crate::TRACING_DOMAIN_WINDOWS,
        window_label = WINDOW_LABEL_SPLASH,
        configured_wait_ms = settings.minimum_ms(),
        actual_wait_ms = minimum_wait_started.elapsed().as_secs_f64() * 1000.0,
        lifecycle_elapsed_ms = lifecycle_started.elapsed().as_secs_f64() * 1000.0,
        "splash minimum wait completed"
    );
    let fade_out = emit_order(
        &invoking_window,
        crate::SplashOrderDto::new("fade_out", std::option::Option::Some("Initialisation terminée."), std::option::Option::Some(settings.fade_ms())),
    );
    if let std::result::Result::Err(error) = fade_out {
        return std::result::Result::Err(error);
    }
    let fade_wait_started = std::time::Instant::now();
    tokio::time::sleep(std::time::Duration::from_millis(u64::from(settings.fade_ms()))).await;
    ksp_logging_lib::debug!(
        target: crate::TRACING_TARGET,
        domain = crate::TRACING_DOMAIN_WINDOWS,
        window_label = WINDOW_LABEL_SPLASH,
        configured_wait_ms = settings.fade_ms(),
        actual_wait_ms = fade_wait_started.elapsed().as_secs_f64() * 1000.0,
        lifecycle_elapsed_ms = lifecycle_started.elapsed().as_secs_f64() * 1000.0,
        "splash fade-out wait completed"
    );
    let show_main = crate::show_main_window(&app);
    if let std::result::Result::Err(error) = show_main {
        return std::result::Result::Err(error);
    }
    let destroyed = invoking_window.destroy();
    if let std::result::Result::Err(error) = destroyed {
        return std::result::Result::Err(
            ksp_core_lib::Error::new(crate::ERROR_CODE_TAURI_WINDOW_OPERATION_FAILED, "Cannot destroy Config Desk splash window")
                .with_context("window_label", WINDOW_LABEL_SPLASH)
                .with_source(error),
        );
    }
    ksp_logging_lib::debug!(
        target: crate::TRACING_TARGET,
        domain = crate::TRACING_DOMAIN_WINDOWS,
        window_label = WINDOW_LABEL_SPLASH,
        expected_backend_lifecycle_ms = settings.expected_backend_lifecycle_ms(),
        actual_backend_lifecycle_ms = lifecycle_started.elapsed().as_secs_f64() * 1000.0,
        "splash window destroyed after main activation"
    );
    return std::result::Result::Ok(());
}

fn emit_order(window: &tauri::WebviewWindow, order: crate::SplashOrderDto) -> ksp_core_lib::Result<()> {
    let action = order.action.clone();
    let emitted = window.emit(SPLASH_EVENT_NAME, order);
    return match emitted {
        std::result::Result::Ok(()) => {
            ksp_logging_lib::trace!(
                target: crate::TRACING_TARGET,
                domain = crate::TRACING_DOMAIN_WINDOWS,
                window_label = WINDOW_LABEL_SPLASH,
                action = action.as_str(),
                "splash order emitted"
            );
            std::result::Result::Ok(())
        },
        std::result::Result::Err(error) => std::result::Result::Err(
            ksp_core_lib::Error::new(crate::ERROR_CODE_TAURI_WINDOW_OPERATION_FAILED, "Cannot emit Config Desk splash order")
                .with_context("window_label", WINDOW_LABEL_SPLASH)
                .with_context("action", action)
                .with_source(error),
        ),
    };
}