<?php
/** Free request validation and native taxonomy compiler. */
namespace Fqbpro\Plugin\Query\Request;
use Fqbpro\Plugin\Blocks\FilterHeader;
if (!defined('ABSPATH')) { exit; }
require_once __DIR__ . '/query/request-urls.php';
function filter_parameter_name($query_id, $source_id)
{
	return is_string($source_id) && preg_match('/^taxonomy:[a-z0-9_-]+$/', $source_id) ? request_prefix($query_id) . 'taxQuery-' . substr($source_id, 9) : '';
}
function normalize_state($request, $configuration)
{
	$request = is_array($request) ? $request : [];
	$result = [];
	$controls = $configuration['nativeControls'] ?? [];
	$parameters = native_parameter_names($configuration);
	$generated = native_generated_parameter_names($configuration);
	foreach ($controls as $control) {
		$id = $control['controlId'];
		$kind = $control['kind'];
		if (in_array($kind, ['apply', 'reset'], true)) continue;
		$state = ['value' => '', 'values' => [], 'from' => '', 'to' => '', 'errors' => $control['errors'] ?? []];
		foreach (native_parameter_suffixes($control) as $suffix) {
			$key = $parameters[$id][$suffix] ?? '';
			$legacy_key = $generated[$id][$suffix] ?? '';
			$raw = $key !== '' ? (array_key_exists($key, $request) ? $request[$key] : ($request[$legacy_key] ?? '')) : '';
			if ($kind === 'choice') {
				$values = is_array($raw) ? $raw : [$raw];
				if (count($values) > MAX_VALUES_PER_FILTER) $state['errors'][] = 'too-many-values';
				foreach (array_slice($values, 0, MAX_VALUES_PER_FILTER) as $value) {
					if (!is_scalar($value)) { $state['errors'][] = 'invalid-value'; continue; }
					$value = trim((string) $value);
					if ($value === '') continue;
					if (!in_array($value, array_column($control['choices'], 'value'), true)) { $state['errors'][] = 'invalid-choice'; continue; }
					$state['values'][] = $value;
				}
				$state['values'] = array_values(array_unique($state['values']));
				if (!$control['settings']['multiple'] && count($state['values']) > 1) $state['errors'][] = 'multiple-not-allowed';
				$state['value'] = $state['values'][0] ?? '';
				continue;
			}
		}

		$result[$id] = $state;
	}
	return ['nativeControls' => $result];
}

namespace Fqbpro\Plugin\Query\Compiler;
use Fqbpro\Plugin\Blocks\FilterHeader;
function compile($query, $configuration, $state, $sources)
{
	if (!empty($configuration['errors'])) { $query['post__in'] = [0]; return $query; }
	foreach ($configuration['nativeControls'] ?? [] as $control) {
		$current = $state['nativeControls'][$control['controlId']] ?? [];
		if (!empty($control['errors']) || !empty($current['errors'])) { $query['post__in'] = [0]; return $query; }
		if (!in_array($control['kind'], ['choice', 'apply', 'reset'], true)) { $query['post__in'] = [0]; return $query; }
		$settings = $control['settings'];
		if ($control['kind'] === 'choice' && !empty($current['values'])) {
			$source = $sources[$control['sourceId']] ?? [];
			if (($source['type'] ?? '') !== 'taxonomy' || array_diff($current['values'], array_column($control['choices'], 'value'))) { $query['post__in'] = [0]; return $query; }
			$clause = ['taxonomy' => $source['source'], 'field' => 'slug', 'terms' => $current['values'], 'operator' => $settings['operator'], 'include_children' => $settings['includeChildren']];
			if ($settings['operator'] === 'AND' && $settings['includeChildren']) {
				$group = ['relation' => 'AND'];
				foreach ($current['values'] as $value) $group[] = array_merge($clause, ['terms' => [$value], 'operator' => 'IN']);
				$clause = $group;
			}
			// Native WP_Query composes the visitor taxonomy constraint with the saved query.
			// phpcs:ignore WordPress.DB.SlowDBQuery.slow_db_query_tax_query
			$query['tax_query'] = merge_fixed_group($query['tax_query'] ?? [], $clause);
		}
	}
	return $query;
}
function merge_fixed_group($existing, $clause)
{
	return $existing ? ['relation' => 'AND', $existing, $clause] : [$clause];
}