use tauri::{Emitter, Manager, WebviewUrl, WebviewWindowBuilder};

use crate::PreferencesScript;

/// Open a floating always-on-top task window.
#[tauri::command]
pub async fn open_task_window(app: tauri::AppHandle) -> Result<(), String> {
    if let Some(window) = app.get_webview_window("tasks-float") {
        window.show().map_err(|e| e.to_string())?;
        window.set_focus().map_err(|e| e.to_string())?;
        app.emit("task-window-focus", ())
            .map_err(|e| e.to_string())?;
        return Ok(());
    }

    // On Linux we use native KWin/Mutter decorations so resize and drag
    // are handled by the compositor. Tauri's frameless path on Wayland
    // doesn't honour diagonal resize reliably and Tauri's own drag
    // region adds latency on webkit2gtk. macOS and Windows keep the
    // custom frameless chrome drawn by the Titlebar component.
    let use_native_decorations = cfg!(target_os = "linux");

    let mut builder =
        WebviewWindowBuilder::new(&app, "tasks-float", WebviewUrl::App("/float".into()))
            .title("Kon Tasks")
            .inner_size(480.0, 520.0)
            .min_inner_size(360.0, 480.0)
            .always_on_top(true)
            .decorations(use_native_decorations)
            .resizable(true);

    // Inject preferences before Svelte mounts
    if let Some(script) = app.try_state::<PreferencesScript>() {
        if !script.0.is_empty() {
            builder = builder.initialization_script(&script.0);
        }
    }

    builder.build().map_err(|e| e.to_string())?;

    Ok(())
}

/// Open the transcript viewer window.
#[tauri::command]
pub async fn open_viewer_window(app: tauri::AppHandle) -> Result<(), String> {
    if let Some(window) = app.get_webview_window("transcript-viewer") {
        window.show().map_err(|e| e.to_string())?;
        window.set_focus().map_err(|e| e.to_string())?;
        return Ok(());
    }

    // See note in open_task_window for the Linux-vs-other platform split.
    let use_native_decorations = cfg!(target_os = "linux");

    let mut builder =
        WebviewWindowBuilder::new(&app, "transcript-viewer", WebviewUrl::App("/viewer".into()))
            .title("Kon - Transcription Editor")
            .inner_size(600.0, 700.0)
            .min_inner_size(560.0, 520.0)
            .decorations(use_native_decorations)
            .resizable(true);

    // Inject preferences before Svelte mounts
    if let Some(script) = app.try_state::<PreferencesScript>() {
        if !script.0.is_empty() {
            builder = builder.initialization_script(&script.0);
        }
    }

    builder.build().map_err(|e| e.to_string())?;

    Ok(())
}