/**
 * Example Plugin - Demonstrates plugin capabilities
 * 
 * This plugin shows:
 * - Activation/Deactivation lifecycle
 * - Hook registration and execution
 * - Event handling
 * - Configuration access
 * - Logging
 */

let intervalId = null;

/**
 * Called when the plugin is loaded
 * @param {Object} context - Plugin context API
 */
export async function activate(context) {
  context.log('Plugin activated!');
  
  const greeting = context.getConfig('greeting');
  context.log(greeting);

  // Register a hook that other plugins or the host can call
  context.registerHook('on-startup', async () => {
    context.log('Startup hook called!');
    return { status: 'ready', plugin: 'example-plugin' };
  });

  // Register a data transformation hook
  context.registerHook('transform-data', async (data) => {
    context.log('Transforming data:', data);
    return {
      ...data,
      processedBy: 'example-plugin',
      timestamp: new Date().toISOString()
    };
  });

  // Listen to host events
  context.on('plugin-loaded', (plugin) => {
    context.log(`Another plugin was loaded: ${plugin.name}`);
  });

  // Example: Periodic task
  intervalId = setInterval(() => {
    context.log('Periodic task running...');
  }, 30000); // Every 30 seconds

  // Example: Run a hook that other plugins might listen to
  const results = await context.runHook('example-event', { message: 'Hello!' });
  context.log('Hook results:', results);
}

/**
 * Called when the plugin is unloaded
 * @param {Object} context - Plugin context API
 */
export async function deactivate(context) {
  context.log('Plugin deactivating...');
  
  if (intervalId) {
    clearInterval(intervalId);
    intervalId = null;
  }

  context.log('Plugin deactivated!');
}

/**
 * Example exported function that can be called directly
 */
export function doSomething(data) {
  console.log('doSomething called with:', data);
  return { success: true, data };
}

/**
 * Example async function
 */
export async function fetchData(url) {
  console.log('Fetching data from:', url);
  // In a real plugin, you might fetch from an API
  return { data: 'example data', url };
}