<?php
namespace JVBase\utility;

if (!defined('ABSPATH')) {
	exit;
}
/**
 * Validates configuration arrays for content types, taxonomies, and user roles
 * Catches errors early in the registration process
 */
class Validator
{
	private array $errors = [];
	private array $warnings = [];
	protected array $validSchemaTypes = [
		'content' => [
			'Article', 'NewsArticle', 'BlogPosting', 'VisualArtwork',
			'Product', 'Service', 'Event', 'Person', 'CreativeWork',
			'MedicalProcedure', 'HowTo', 'Recipe', 'Review',
		],
		'taxonomy' => [
			'CollectionPage', 'DefinedTerm', 'ItemList',
		],
		'user' => [
			'Person',
		],
	];

	protected array $validModifiers = [
		'first', 'last', 'join', 'truncate', 'strip', 'lower', 'upper',
		'title', 'count', 'get', 'default', 'date', 'image_url', 'excerpt', 'plural'
	];

	public function validateAll():array
	{
		$success = [];
		$success['content'] = $this->validateContentConfig(JVB_CONTENT);
		$success['terms'] = $this->validateTaxonomyConfig(JVB_TAXONOMY);
		$success['user'] = $this->validateUserConfig(JVB_USER);
		$success['crossReference'] = $this->validateCrossReferences(JVB_CONTENT, JVB_TAXONOMY, JVB_USER);
		$success['seo'] = $this->validateSEOConfig();
		$success['schema'] = $this->validateSchemaConfig(JVB_SCHEMA ?? []);
		return $success;
	}
	/**
	 * Validate JVB_CONTENT configuration
	 */
	public function validateContentConfig(array $config): bool
	{
		$this->errors = [];
		$this->warnings = [];

		foreach ($config as $slug => $settings) {
			$this->validateSlug($slug, 'content');
			$this->validateContentSettings($slug, $settings);
		}

		if (!empty($this->errors)) {
			error_log('Validation result: '.print_r($this->errors, true));
		}
		if (!empty($this->warnings)) {
			error_log('Warnings: '.print_r($this->warnings, true));
		}

		return empty($this->errors);
	}

	/**
	 * Validate JVB_TAXONOMY configuration
	 */
	public function validateTaxonomyConfig(array $config): bool
	{
		$this->errors = [];
		$this->warnings = [];

		foreach ($config as $slug => $settings) {
			$this->validateSlug($slug, 'taxonomy');
			$this->validateTaxonomySettings($slug, $settings);
		}

		if (!empty($this->errors)) {
			error_log('Validation result: '.print_r($this->errors, true));
		}
		if (!empty($this->warnings)) {
			error_log('Warnings: '.print_r($this->warnings, true));
		}
		return empty($this->errors);
	}

	/**
	 * Validate JVB_USER configuration
	 */
	public function validateUserConfig(array $config): bool
	{
		$this->errors = [];
		$this->warnings = [];

		foreach ($config as $slug => $settings) {
			$this->validateSlug($slug, 'user_role');
			$this->validateUserSettings($slug, $settings);
		}

		if (!empty($this->errors)) {
			error_log('Validation result: '.print_r($this->errors, true));
		}
		if (!empty($this->warnings)) {
			error_log('Warnings: '.print_r($this->warnings, true));
		}
		return empty($this->errors);
	}

	/**
	 * Validate cross-references between configs
	 */
	public function validateCrossReferences(array $content, array $taxonomy, array $user): bool
	{
		$this->errors = [];
		$this->warnings = [];

		// Check taxonomy -> content references
		foreach ($taxonomy as $taxSlug => $taxConfig) {
			foreach ($taxConfig['for_content'] ?? [] as $contentType) {
				if (!isset($content[$contentType])) {
					$this->addError(
						"taxonomy.{$taxSlug}.for_content",
						"References non-existent content type '{$contentType}'"
					);
				}
			}

			// Check is_owned_by references
			foreach ($taxConfig['is_owned_by'] ?? [] as $role) {
				if (!isset($user[$role])) {
					$this->addError(
						"taxonomy.{$taxSlug}.is_owned_by",
						"References non-existent user role '{$role}'"
					);
				}
			}
		}

		// Check user -> content references
		foreach ($user as $userSlug => $userConfig) {
			// Check profile reference
			if (isset($userConfig['profile']) && !isset($content[$userConfig['profile']])) {
				$this->addError(
					"user.{$userSlug}.profile",
					"References non-existent content type '{$userConfig['profile']}'"
				);
			}

			// Check can_create references
			$this->validateCreatableContent($userSlug, $userConfig['can_create'] ?? [], $content, $taxonomy);
		}

		// Check field section references
		foreach ($content as $contentSlug => $contentConfig) {
			$this->validateFieldSections($contentSlug, $contentConfig, 'content');
		}

		if (!empty($this->errors)) {
			error_log('Validation result: '.print_r($this->errors, true));
		}
		if (!empty($this->warnings)) {
			error_log('Warnings: '.print_r($this->warnings, true));
		}

		return empty($this->errors);
	}

	/**
	 * Validate slug format
	 */
	private function validateSlug(string $slug, string $type): void
	{
		// Check for valid characters
		if (!preg_match('/^[a-z0-9_-]+$/', $slug)) {
			$this->addError(
				"{$type}.{$slug}",
				"Slug must contain only lowercase letters, numbers, hyphens, and underscores"
			);
		}

		// Check length
		if (strlen($slug) > 20) {
			$this->addWarning(
				"{$type}.{$slug}",
				"Slug is longer than 20 characters, which may cause issues"
			);
		}

		// Check for reserved WordPress terms
		$reserved = ['post', 'page', 'attachment', 'revision', 'nav_menu_item', 'author', 'category', 'tag'];
		if (in_array($slug, $reserved)) {
			$this->addError(
				"{$type}.{$slug}",
				"Slug '{$slug}' is a reserved WordPress term"
			);
		}
	}

	/**
	 * Validate content type settings
	 */
	private function validateContentSettings(string $slug, array $settings): void
	{
		// Required fields
		if (empty($settings['singular'])) {
			$this->addError("content.{$slug}", "Missing required 'singular' label");
		}

		if (empty($settings['plural'])) {
			$this->addError("content.{$slug}", "Missing required 'plural' label");
		}

		// Validate boolean flags
		$booleanFields = [
			'hide_single', 'show_feed', 'show_directory', 'karma',
			'favouritable', 'responses', 'is_calendar', 'single_image'
		];

		foreach ($booleanFields as $field) {
			if (isset($settings[$field]) && !is_bool($settings[$field])) {
				$this->addError(
					"content.{$slug}.{$field}",
					"Field '{$field}' must be a boolean value"
				);
			}
		}

		// Validate fields configuration
		if (isset($settings['fields'])) {
			$this->validateFieldsConfig($slug, $settings['fields'], 'content');
		}

		// Validate sections if fields exist
		if (!empty($settings['fields']) && !empty($settings['sections'])) {
			$this->validateSectionsConfig($slug, $settings['sections']);
		}

		// Check for conflicting settings
		if (($settings['hide_single'] ?? false) && ($settings['show_directory'] ?? false)) {
			$this->addWarning(
				"content.{$slug}",
				"Content type has both 'hide_single' and 'show_directory' enabled"
			);
		}
	}

	/**
	 * Validate taxonomy settings
	 */
	private function validateTaxonomySettings(string $slug, array $settings): void
	{
		// Required fields
		if (empty($settings['singular'])) {
			$this->addError("taxonomy.{$slug}", "Missing required 'singular' label");
		}

		if (empty($settings['plural'])) {
			$this->addError("taxonomy.{$slug}", "Missing required 'plural' label");
		}

		// Validate for_content
		if (empty($settings['for_content']) || !is_array($settings['for_content'])) {
			$this->addError(
				"taxonomy.{$slug}",
				"Missing or invalid 'for_content' array"
			);
		}

		// Validate content taxonomy specific settings
		if ($settings['is_content'] ?? false) {
			if (empty($settings['content_table'])) {
				$this->addWarning(
					"taxonomy.{$slug}",
					"Content taxonomy missing 'content_table' configuration"
				);
			}
		}

		// Validate ownership settings
		if ($settings['is_ownable'] ?? false) {
			if (empty($settings['is_owned_by'])) {
				$this->addError(
					"taxonomy.{$slug}",
					"Ownable taxonomy missing 'is_owned_by' configuration"
				);
			}
		}
	}

	/**
	 * Validate user role settings
	 */
	private function validateUserSettings(string $slug, array $settings): void
	{
		// Validate dashboard access
		if ($settings['has_dashboard'] ?? false) {
			if (empty($settings['can_create']) && empty($settings['profile'])) {
				$this->addWarning(
					"user.{$slug}",
					"User has dashboard access but no content creation or profile"
				);
			}
		}

		// Validate registration fields
		if ($settings['can_register'] ?? false) {
			if (empty($settings['register_fields'])) {
				$this->addWarning(
					"user.{$slug}",
					"User can register but has no registration fields defined"
				);
			}
		}

		// Validate profile consistency
		if (!empty($settings['profile']) && empty($settings['has_dashboard'])) {
			$this->addWarning(
				"user.{$slug}",
				"User has profile type but no dashboard access"
			);
		}
	}

	/**
	 * Validate fields configuration
	 */
	private function validateFieldsConfig(string $slug, array $fields, string $type): void
	{
		foreach ($fields as $fieldName => $fieldConfig) {
			// Check for required field properties
			if (empty($fieldConfig['type'])) {
				$this->addError(
					"{$type}.{$slug}.fields.{$fieldName}",
					"Field missing required 'type' property"
				);
			}

			// Validate field type
			$validTypes = [
				'text', 'textarea', 'number', 'email', 'url', 'select',
				'radio', 'checkbox', 'true_false', 'date', 'time',
				'datetime', 'color', 'upload', 'image', 'file', 'gallery',
				'repeater', 'location', 'user', 'taxonomy', 'set'
			];

			if (isset($fieldConfig['type']) && !in_array($fieldConfig['type'], $validTypes)) {
				$this->addError(
					"{$type}.{$slug}.fields.{$fieldName}",
					"Invalid field type '{$fieldConfig['type']}'"
				);
			}

			// Validate field-specific configurations
			$this->validateFieldTypeConfig($fieldName, $fieldConfig, "{$type}.{$slug}");
		}
	}

	/**
	 * Validate field type specific configuration
	 */
	private function validateFieldTypeConfig(string $fieldName, array $config, string $path): void
	{
		switch ($config['type'] ?? '') {
			case 'select':
			case 'radio':
			case 'checkbox':
				if (empty($config['options'])) {
					$this->addError(
						"{$path}.fields.{$fieldName}",
						"Field type '{$config['type']}' requires 'options' array"
					);
				}
				break;

			case 'taxonomy':
				if (empty($config['taxonomy'])) {
					$this->addError(
						"{$path}.fields.{$fieldName}",
						"Taxonomy field requires 'taxonomy' property"
					);
				}
				break;

			case 'repeater':
				if (empty($config['fields'])) {
					$this->addError(
						"{$path}.fields.{$fieldName}",
						"Repeater field requires 'fields' definition array"
					);
				}
				break;

			case 'number':
				if (isset($config['min']) && isset($config['max']) && $config['min'] > $config['max']) {
					$this->addError(
						"{$path}.fields.{$fieldName}",
						"Number field 'min' value cannot be greater than 'max'"
					);
				}
				break;
		}
	}

	/**
	 * Validate sections configuration
	 */
	private function validateSectionsConfig(string $slug, array $sections): void
	{
		foreach ($sections as $sectionSlug => $sectionConfig) {
			if (empty($sectionConfig['label'])) {
				$this->addError(
					"content.{$slug}.sections.{$sectionSlug}",
					"Section missing required 'label'"
				);
			}
		}
	}

	/**
	 * Validate field sections match defined sections
	 */
	private function validateFieldSections(string $slug, array $config, string $type): void
	{
		if (empty($config['fields']) || empty($config['sections'])) {
			return;
		}

		$definedSections = array_keys($config['sections']);

		foreach ($config['fields'] as $fieldName => $fieldConfig) {
			if (isset($fieldConfig['section']) && !in_array($fieldConfig['section'], $definedSections)) {
				$this->addError(
					"{$type}.{$slug}.fields.{$fieldName}",
					"Field references non-existent section '{$fieldConfig['section']}'"
				);
			}
		}
	}

	/**
	 * Validate creatable content references
	 */
	private function validateCreatableContent(string $userSlug, array $canCreate, array $content, array $taxonomy): void
	{
		foreach ($canCreate as $item) {
			if (is_array($item)) {
				foreach ($item as $subType => $types) {
					foreach ($types as $type) {
						if (!isset($content[$type]) && !isset($taxonomy[$type])) {
							$this->addError(
								"user.{$userSlug}.can_create",
								"References non-existent type '{$type}'"
							);
						}
					}
				}
			} else {
				if (!isset($content[$item]) && !isset($taxonomy[$item])) {
					$this->addError(
						"user.{$userSlug}.can_create",
						"References non-existent type '{$item}'"
					);
				}
			}
		}
	}

	/**
	 * Add error message
	 */
	private function addError(string $path, string $message): void
	{
		$this->errors[] = "[{$path}] {$message}";
	}

	/**
	 * Add warning message
	 */
	private function addWarning(string $path, string $message): void
	{
		$this->warnings[] = "[{$path}] {$message}";
	}

	/**
	 * Get validation errors
	 */
	public function getErrors(): array
	{
		return $this->errors;
	}

	/**
	 * Get validation warnings
	 */
	public function getWarnings(): array
	{
		return $this->warnings;
	}

	/**
	 * Output validation results to error log
	 */
	public function logResults(): void
	{
		if (!empty($this->errors)) {
			error_log('[ConfigValidator] Validation Errors:');
			foreach ($this->errors as $error) {
				error_log("  - {$error}");
			}
		}

		if (!empty($this->warnings) && WP_DEBUG) {
			error_log('[ConfigValidator] Validation Warnings:');
			foreach ($this->warnings as $warning) {
				error_log("  - {$warning}");
			}
		}
	}

	/**
	 * Validate SEO configurations across all types
	 */
	public function validateSEOConfig(): bool
	{
		$this->errors = [];
		$this->warnings = [];

		foreach (JVB_CONTENT ?? [] as $slug => $config) {
			if (isset($config['seo'])) {
				$this->validateTypeSEOConfig($slug, $config['seo'], 'content', $config);
			}
		}

		foreach (JVB_TAXONOMY ?? [] as $slug => $config) {
			if (isset($config['seo'])) {
				$this->validateTypeSEOConfig($slug, $config['seo'], 'taxonomy', $config);
			}
		}

		foreach (JVB_USER ?? [] as $slug => $config) {
			if (isset($config['seo'])) {
				$this->validateTypeSEOConfig($slug, $config['seo'], 'user', $config);
			}
		}

		$this->logResults();
		return empty($this->errors);
	}

	/**
	 * Validate SEO config for a specific type
	 */
	private function validateTypeSEOConfig(string $slug, array $seo, string $objectType, array $fullConfig): void
	{
		$path = "{$objectType}.{$slug}.seo";
		$availableFields = $this->getAvailableSEOFields($slug, $objectType, $fullConfig);

		if (isset($seo['schema_type'])) {
			$validTypes = $this->validSchemaTypes[$objectType] ?? $this->validSchemaTypes['content'];
			if (!in_array($seo['schema_type'], $validTypes)) {
				$this->addWarning("{$path}.schema_type", "'{$seo['schema_type']}' may not be valid. Common types: " . implode(', ', array_slice($validTypes, 0, 5)));
			}
		}

		if (isset($seo['field_map'])) {
			foreach ($seo['field_map'] as $prop => $source) {
				$this->validateFieldSource($source, $availableFields, "{$path}.field_map.{$prop}");
			}
		}

		if (isset($seo['meta']['title'])) {
			$this->validatePatternString($seo['meta']['title'], $availableFields, "{$path}.meta.title");
		}

		if (isset($seo['meta']['description'])) {
			$this->validatePatternString($seo['meta']['description'], $availableFields, "{$path}.meta.description");
		}
	}

	/**
	 * Validate a field source reference
	 */
	private function validateFieldSource(string $source, array $availableFields, string $path): void
	{
		if (empty($source)) {
			return;
		}

		if (str_contains($source, '{{')) {
			$this->validatePatternString($source, $availableFields, $path);
			return;
		}

		$field = explode('|', $source)[0];
		$field = explode('.', $field)[0];

		if (!in_array($field, $availableFields) && !in_array($field, ['site', 'author', 'meta', 'terms'])) {
			$this->addWarning($path, "Field '{$field}' may not exist");
		}
	}

	/**
	 * Validate pattern string syntax
	 */
	private function validatePatternString(string $pattern, array $availableFields, string $path): void
	{
		preg_match_all('/\{\{([^}]+)\}\}/', $pattern, $matches);

		foreach ($matches[1] as $token) {
			$token = trim($token);

			if (empty($token)) {
				$this->addError($path, "Empty placeholder {{}} found");
				continue;
			}

			$parts = explode('|', $token);
			$field = trim(explode('.', $parts[0])[0]);

			if (!in_array($field, $availableFields) && !in_array($field, ['site', 'author', 'meta', 'terms'])) {
				$this->addWarning($path, "Field '{$field}' in pattern may not exist");
			}

			if (isset($parts[1])) {
				$modifier = trim(explode(':', $parts[1])[0]);
				if (!in_array($modifier, $this->validModifiers)) {
					$this->addWarning($path, "Unknown modifier '|{$modifier}'");
				}
			}
		}
	}

	/**
	 * Validate JVB_SCHEMA configuration
	 */
	public function validateSchemaConfig(array $schema): bool
	{
		$this->errors = [];
		$this->warnings = [];

		if (isset($schema['business'])) {
			$this->validateBusinessSchema($schema['business']);
		}

		if (isset($schema['faqs']['items'])) {
			foreach ($schema['faqs']['items'] as $i => $faq) {
				if (empty($faq['question'])) {
					$this->addError("schema.faqs.items[{$i}].question", "FAQ question required");
				}
				if (empty($faq['answer'])) {
					$this->addError("schema.faqs.items[{$i}].answer", "FAQ answer required");
				}
			}
		}

		$this->logResults();
		return empty($this->errors);
	}

	/**
	 * Validate business schema
	 */
	private function validateBusinessSchema(array $config): void
	{
		$path = 'schema.business';

		if (empty($config['name'])) {
			$this->addError("{$path}.name", "Business name required");
		}

		if (isset($config['url']) && !filter_var($config['url'], FILTER_VALIDATE_URL)) {
			$this->addError("{$path}.url", "Invalid URL");
		}

		if (isset($config['email']) && !filter_var($config['email'], FILTER_VALIDATE_EMAIL)) {
			$this->addError("{$path}.email", "Invalid email");
		}

		if (isset($config['geo'])) {
			$lat = $config['geo']['lat'] ?? null;
			$lng = $config['geo']['lng'] ?? null;

			if ($lat !== null && (!is_numeric($lat) || $lat < -90 || $lat > 90)) {
				$this->addError("{$path}.geo.lat", "Latitude must be -90 to 90");
			}
			if ($lng !== null && (!is_numeric($lng) || $lng < -180 || $lng > 180)) {
				$this->addError("{$path}.geo.lng", "Longitude must be -180 to 180");
			}
		}

		if (isset($config['opening_hours'])) {
			$days = ['monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday', 'sunday'];
			foreach ($config['opening_hours'] as $day => $data) {
				if (!in_array(strtolower($day), $days)) {
					$this->addWarning("{$path}.opening_hours.{$day}", "Invalid day");
				}
				if (is_array($data) && empty($data['closed'])) {
					if (isset($data['open']) && !preg_match('/^\d{2}:\d{2}$/', $data['open'])) {
						$this->addWarning("{$path}.opening_hours.{$day}.open", "Use HH:MM format");
					}
				}
			}
		}

		if (isset($config['aggregate_rating'])) {
			$value = $config['aggregate_rating']['value'] ?? null;
			if ($value !== null && (!is_numeric($value) || $value < 0 || $value > 5)) {
				$this->addError("{$path}.aggregate_rating.value", "Rating must be 0-5");
			}
		}

		if (isset($config['same_as'])) {
			foreach ($config['same_as'] as $i => $link) {
				$url = is_array($link) ? ($link['url'] ?? '') : $link;
				if (!empty($url) && !filter_var($url, FILTER_VALIDATE_URL)) {
					$this->addError("{$path}.same_as[{$i}]", "Invalid URL: {$url}");
				}
			}
		}
	}

	/**
	 * Get available fields for SEO validation
	 */
	private function getAvailableSEOFields(string $slug, string $objectType, array $config): array
	{
		$fields = match($objectType) {
			'content' => ['post_title', 'post_excerpt', 'post_content', 'post_date', 'post_modified', 'post_thumbnail', 'permalink'],
			'taxonomy' => ['term_name', 'term_description', 'term_slug', 'permalink', 'count'],
			'user' => ['display_name', 'first_name', 'last_name', 'user_email', 'description', 'permalink'],
			default => []
		};

		if (!empty($config['fields'])) {
			$fields = array_merge($fields, array_keys($config['fields']));
		}

		return $fields;
	}
}