/**
 * Clear everything after an administrator updates a plugin or theme from the dashboard.
 * Automatic background updates run without a logged-in user, so this will not run for those.
 */
add_action( 'upgrader_process_complete', function() {
    if ( function_exists( 'cceverywhere_clear_all' ) ) {
        cceverywhere_clear_all();
    }
} );

/**
 * Disable the Clear Cache admin bar button completely.
 */
add_filter( 'cceverywhere_admin_bar_enabled', '__return_false' );

/**
 * Add custom settings fields for purging a custom cache directory.
 *
 * This example adds a checkbox field that triggers a custom clearing action
 * and a text field to define the directory URL.
 * 
 * @param array $fields → An array of existing settings fields.
 *
 * @return array → The modified settings fields array, including any new custom fields.
 */
add_filter( 'cceverywhere_custom_settings', function( $fields ) {
    // Add a custom checkbox field that also defines where the action is called
    $fields[] = [
        'key'         => 'purge_custom_cache_directory', // A unique field key
        'title'       => __( 'Purge Custom Cache Directory', 'clear-cache-everywhere' ), // Field title
        'type'        => 'checkbox', // Field type
        'sanitize'    => 'sanitize_checkbox', // Sanitize callback
        'section'     => 'custom', // Section name in the settings - Always use "custom"
        'default'     => false, // Default value (unchecked)
        'comments'    => __( 'Purges our custom cache directory.', 'clear-cache-everywhere' ), // Description
        'run_context' => 'ajax', // When and how the action is run (accepts "ajax" or "page" for page reload)
        'callback'    => 'myprefix_clear_custom_cache_directory' 
    ];
    
    // Add a custom text field that we can use in our callback method
    $fields[] = [
        'key'      => 'custom_cache_directory_url', // A unique field key
        'title'    => __( 'Custom Cache Directory URL', 'clear-cache-everywhere' ),
        'type'     => 'text',
        'sanitize' => 'sanitize_text_field',
        'section'  => 'custom', // Always use "custom",
        'default'  => WP_CONTENT_DIR . '/cache/myplugin/', // Default value
        'comments' => __( 'Enter the URL of the custom cache directory to purge. If left blank, it will default to wp-content/cache/myplugin/', 'clear-cache-everywhere' ),
    ];
    
    return $fields; // Return the modified settings fields
} );


/**
 * The callback method for purging a custom cache directory.
 * MUST be called correctly from the 'cceverywhere_custom_settings' hook above under 'callback' property.
 * 
 * @return array Status of the clearing action.
 */
function myprefix_clear_custom_cache_directory() {
    // The prefix for all settings
    $prefix = 'clear_cache_everywhere_';
    
    // Get custom directory URL from settings
    $custom_dir = sanitize_text_field( get_option( $prefix . 'custom_cache_directory_url', '' ) );

    // Default path if no custom URL is set
    $cache_dir = ! empty( $custom_dir ) ? $custom_dir : WP_CONTENT_DIR . '/cache/myplugin/';

    // Check if directory exists
    if ( ! file_exists( $cache_dir ) ) {
        return [
            'status'        => 'fail',
            'error_message' => __( 'Cache directory does not exist.', 'clear-cache-everywhere' ),
        ];
    }

    // Attempt to delete files
    $files = glob( $cache_dir . '*' );
    $failed = [];

    foreach ( $files as $file ) {
        if ( ! @unlink( $file ) ) {
            $failed[] = $file;
        }
    }

    if ( ! empty( $failed ) ) {
        return [
            'status'        => 'fail',
            'error_message' => sprintf( __( 'Failed to delete %d file(s) in the cache directory.', 'clear-cache-everywhere' ), count( $failed ) ),
        ];
    }

    return [
        'status'        => 'success',
        'error_message' => null,
    ];
}

/**
 * Hook into all each clearing action before it runs
 *
 * $action properties:
 *  - 'key'        => string, unique action key
 *  - 'title'      => string, human-readable label
 *  - 'callback'   => callable|null, optional callback
 */
add_action( 'cceverywhere_before_clear', function( $action ) {
    error_log( sprintf( 'About to clear cache action: %s', $action[ 'title' ] ) );
});

/**
 * Hook into all each clearing action after it runs
 *
 * $action properties:
 *  - 'key'        => string, unique action key
 *  - 'title'      => string, human-readable label
 *  - 'callback'   => callable|null, optional callback
 * 
 * $status => string, result status ('success', 'fail', 'skipped', 'info')
 * $msg => string|null, additional information or error details about the action
 */
add_action( 'cceverywhere_after_clear', function( $action, $status, $msg ) {
    if ( $status === 'fail' ) {
        wp_mail( 'admin@example.com', 'Cache Clear Failed', 'Action: ' . $action[ 'title' ] . "\nError: " . $msg );
    }
});

/**
 * Never include Transients in Clear All or the admin bar button.
 *
 * @param array $actions → The list of clearing actions.
 *
 * @return array → The modified list of clearing actions.
 */
add_filter( 'cceverywhere_clearing_actions', function( $actions ) {
    foreach ( $actions as &$action ) {
        if ( 'transients' === $action[ 'key' ] ) {
            $action[ 'enabled' ] = false;
        }
    }
    unset( $action );

    return $actions;
} );