<?php
// === Functions ===
// Hook for the theme footer
function hello_world_footer() {
  $config = hello_world_get_config();
  echo '<p>' . $config['message'] . '</p>';
}

// Alias for getting i18n strings for this plugin
function hello_world_i18n($key) {
  return i18n_r(HELLO_WORLD . '/' . $key);
}

// Administration panel
function hello_world_admin() {
  // Initialize the configuration file
  $init = hello_world_config_exists() || hello_world_init();

  // Check if we need to save the configuration
  $save_changes = isset($_POST['save-configuration']);

  if ($save_changes) {
    // Validate and save the config
    $data         = hello_world_validate_config($_POST);
    $save_success = hello_world_save_config($data);

    // Display a success/error status message for the admin
    hello_world_display_status_message($save_success);
  }

  // Show the admin panel page
  $config = hello_world_get_config();
  include(HELLO_WORLD_PLUGINPATH . '/admin.php');
}

// Load plugin configuration into an array
function hello_world_get_config() {
  $file     = HELLO_WORLD_CONFIGFILE;
  $contents = file_get_contents($file);
  $json     = json_decode($contents);
  $config   = (array) $json;

  return $config;
}

// Save array data to the configuration
function hello_world_save_config($config = array()) {
  $file     = HELLO_WORLD_CONFIGFILE;
  $contents = json_encode($config);

  return file_put_contents($file, $contents);
}

// Validate an array for saving it as a configuration object
function hello_world_validate_config($data) {
  // Clean up the configuration array...
  $config = array(
    'message' => $data['message'],
  );

  return $config;
}

// Check that the configuration file exists
function hello_world_config_exists() {
  return file_exists(HELLO_WORLD_CONFIGFILE);
}

// Create a default configuration file
function hello_world_init() {
  $config = array('message' => hello_world_i18n('HELLO_WORLD'));

  return hello_world_save_config($config);
}

// Display the success/error status of a coonfiguration's saving
function hello_world_display_status_message($status) {
  if ($status) {
    $class   = 'success';
    $message = hello_world_i18n('CONFIG_SAVE_SUCCESS');
  } else {
    $class   = 'error';
    $message = hello_world_i18n('CONFIG_SAVE_ERROR');
  }

  echo '<div class="' . $class . '">' . $message . '</div>';
}