<?php

Lib::loadClass('Type_WpsProcess');
Lib::loadClass('Api_OwsException');

class Api_WpsHelper {

	static function getUserWpsProcessList($userLogin = null) {
		// TODO: $userLogin
		$defaultWpsProcessList = self::getDefaultWpsProcessList();
		if (array_key_exists($identifier, $defaultWpsProcessList)) return Type_WpsProcess::build( $defaultWpsProcessList[$identifier] );

		$wpsProcessList = [];
		// TODO: fetch from DB - `CRM_#CACHE_ACL_FUNCTIONS` or object like UrlActions

		$wpsProcessList = array_merge($defaultWpsProcessList, $wpsProcessList);
		return array_map(function ($wpsProcess, $identifier) {
			return (object)[ 'identifier' => $identifier, 'title' => $wpsProcess['title'], 'description' => $wpsProcess['description'] ];
		}, $wpsProcessList, array_keys($wpsProcessList));
		return $wpsProcessList;
	}

	static function getUserWpsProcess($identifier, $userLogin = null) {
		// TODO: $userLogin
		$defaultWpsProcessList = self::getDefaultWpsProcessList();
		if (array_key_exists($identifier, $defaultWpsProcessList)) return Type_WpsProcess::build( $defaultWpsProcessList[$identifier] );

		// TODO: fetch from DB - `CRM_#CACHE_ACL_FUNCTIONS` or object like UrlActions

		throw new Exception("Forbidden - wps function not exists or access denied", 403);
	}

	static function getDefaultWpsProcessList() {
		$defaultWpsProcessList = [];

		{
			$selectFeatureBase = [
				'dataInputs' => [
					[
						'maxOccurs' => "1",
						'minOccurs' => "1",
						'identifier' => 'typeName',
						'title' => "Feature typeName",
						'description' => "Feature typeName eg. default_db/PROBLEMS",
						'type' => 'literal',
					],
					[
						'maxOccurs' => "unbounded",
						'minOccurs' => "1",
						'identifier' => 'primaryKey',
						'title' => "Feature primaryKey",
						'description' => "Feature primaryKey",
						'type' => 'literal',
					],
				],
				// 'MimeType' => text/xml, 'Encoding' => base64, 'Schema' => http://foo.bar/gml/3.1.0/polygon.xsd
				'defaultOutput' => [ 'MimeType' => "text/xml; subtype=wfs-collection/1.0" ], // TODO: result type - like Insert Wfs Transaction result - list of: Success (primaryKey = 123), ...
				'supportedOutput' => [
					[ 'MimeType' => "text/xml; subtype=wfs-collection/1.0" ],
					[ 'MimeType' => "text/xml; subtype=wfs-collection/1.1" ],
					[ 'MimeType' => "application/json" ],
					// [ 'MimeType' => "application/wfs-collection-1.0" ],
					// [ 'MimeType' => "application/wfs-collection-1.1" ],
					// [ 'MimeType' => "application/zip" ],
				]
			];
			$defaultWpsProcessList['p5:selectFeature']   = array_merge([ 'title' => "Select feature", 'descriptin' => "Select feature (set attribute @selected to true)" ], $selectFeatureBase);
			$defaultWpsProcessList['p5:unselectFeature'] = array_merge([ 'title' => "Unselect feature", 'descriptin' => "Unselect feature (set attribute @selected to false)" ], $selectFeatureBase);
		}

		array_walk($defaultWpsProcessList, function (&$wpsFunction, $identifier) {
			$wpsFunction['identifier'] = $identifier;
		});
		return $defaultWpsProcessList;
	}

	static function validateProcessArgs($wpsProcess, $args) {
		foreach ($wpsProcess->dataInputs as $input) {
			$identifier = $input->identifier;
			// TODO: required? minOccurs > 0
			if ($input->minOccurs > 0 && empty($args[ $identifier ])) throw new Api_OwsException("Missing value for '{$identifier}'", 501, null, 'MissingParameterValue', 'request');
			$totalValues = count($args[ $identifier ]);
			if ($totalValues > 1) {
				if ( 'unbounded' !== $input->maxOccurs && $totalValues > $input->maxOccurs ) {
					throw new Api_OwsException("Too many values for '{$identifier}'", 501, null, 'TooManyParameterValues', 'request');
				}
			}
			// TODO: validate values with type definition - _xsdType
		}
	}

	static function executeProcess($wpsProcess, $args, $responseForm = 'json') {
		$className = implode("_", array_merge(
			[
				'Api',
				'Process',
			], array_map('ucfirst', explode(':', $wpsProcess->identifier))
		) );
		if (!Lib::tryLoadClass($className)) {
			throw new Api_OwsException("Api Process not found '{$wpsProcess->identifier}'", 500, null, 'ApiProcessNotFound', 'request');
		}
		$className::run($args, $responseForm);
	}

}