<?php
/**
 * Generate a list of tags to skip during the test run.
 *
 * Require a minimum version of WordPress:
 *
 *   @require-wp-4.0
 *   Scenario: Core translation CRUD
 *
 * Then use in bash script:
 *
 *   BEHAT_TAGS=$(php behat-tags.php)
 *   vendor/bin/behat --format progress $BEHAT_TAGS
 */

function version_tags( $prefix, $current, $operator = '<' ) {
	if ( ! $current )
		return array();

	exec( "grep '@{$prefix}-[0-9\.]*' -h -o features/*.feature | uniq", $existing_tags );

	$skip_tags = array();

	foreach ( $existing_tags as $tag ) {
		$compare = str_replace( "@{$prefix}-", '', $tag );
		if ( version_compare( $current, $compare, $operator ) ) {
			$skip_tags[] = $tag;
		}
	}

	return $skip_tags;
}

$wp_version_reqs = array();
// Only apply @require-wp tags when WP_VERSION isn't 'latest' or 'nightly'
// 'latest' and 'nightly' are expected to work with all features
if ( ! in_array( getenv( 'WP_VERSION' ), array( 'latest', 'nightly', 'trunk' ), true ) ) {
	$wp_version_reqs = version_tags( 'require-wp', getenv( 'WP_VERSION' ), '<' );
}

$skip_tags = array_merge(
	$wp_version_reqs,
	version_tags( 'require-php', PHP_VERSION, '<' ),
	version_tags( 'less-than-php', PHP_VERSION, '>' )
);

# Skip Github API tests by default because of rate limiting. See https://github.com/wp-cli/wp-cli/issues/1612
$skip_tags[] = '@github-api';

# Skip tests known to be broken.
$skip_tags[] = '@broken';

# Require PHP extension, eg 'imagick'.
function extension_tags() {
	$extension_tags = array();
	exec( "grep '@require-extension-[A-Za-z_]*' -h -o features/*.feature | uniq", $extension_tags );

	$skip_tags = array();

	$substr_start = strlen( '@require-extension-' );
	foreach ( $extension_tags as $tag ) {
		$extension = substr( $tag, $substr_start );
		if ( ! extension_loaded( $extension ) ) {
			$skip_tags[] = $tag;
		}
	}

	return $skip_tags;
}

$skip_tags = array_merge( $skip_tags, extension_tags() );

if ( !empty( $skip_tags ) ) {
	echo '--tags=~' . implode( '&&~', $skip_tags );
}