use serde_json::{json, Value};
use std::fs;
use std::path::PathBuf;

use crate::llama::LlamaManager;

fn settings_path() -> PathBuf {
    LlamaManager::data_dir().join("settings.json")
}

/// Load app settings from disk.
#[tauri::command]
pub fn load_settings() -> Value {
    let path = settings_path();
    if !path.exists() {
        return json!({});
    }
    match fs::read_to_string(&path) {
        Ok(content) => serde_json::from_str(&content).unwrap_or(json!({})),
        Err(_) => json!({}),
    }
}

/// Save app settings to disk.
#[tauri::command]
pub fn save_settings(settings: Value) -> Result<(), String> {
    let path = settings_path();
    if let Some(parent) = path.parent() {
        fs::create_dir_all(parent).map_err(|e| format!("Cannot create settings dir: {e}"))?;
    }
    let json = serde_json::to_string_pretty(&settings).map_err(|e| e.to_string())?;
    fs::write(&path, json).map_err(|e| format!("Cannot write settings: {e}"))?;
    Ok(())
}

/// Toggle devtools on the main window.
#[tauri::command]
pub fn toggle_devtools(app: tauri::AppHandle, open: bool) {
    use tauri::Manager;
    if let Some(window) = app.get_webview_window("main") {
        if open {
            window.open_devtools();
        } else {
            window.close_devtools();
        }
    }
}