<?php

/*
	{
		'type': string,
		'minOccurs': xsd:nonNegativeInteger, default: 1,
		'maxOccurs': xsd:allNNI, default: 1,
		'restrictions': [], // TODO: array of type Restriction
		'appInfo': [], // TODO: define type for appInfo
		'source': p5:enum (values: 'table', 'view', 'backRef'), default: 'table'
	}
 */

class Type_Field_Simple extends Type_Field {}
class Type_Field_Ref extends Type_Field {}

class Type_Field {

	var $_data = [];

	static function build($field = []) {
		if (!$field) throw new Exception("Missing data in build Type Field");
		if (empty($field['type']) && empty($field['xsdType'])) throw new Exception("Missing type in Type Field build");
		$type = (!empty($field['type'])) ? $field['type'] : $field['xsdType'];
		// TODO: validate $field['type']

		$instance = ('ref:' === substr($type, 0, 4))
		 	? new Type_Field_Ref($field)
			: new Type_Field_Simple($field)
		;
		$instance->type = $type;
		$instance->minOccurs = V::get('minOccurs', 1, $field, 'int');
		$instance->maxOccurs = ('unbounded' === V::get('maxOccurs', 1, $field)) ? 'unbounded' : V::get('maxOccurs', 1, $field);
		$instance->restrictions = (!empty($field['restrictions']))
			? self::parseRestriction($field['restrictions'])
			: []
		;
		$instance->appInfo = (!empty($field['appInfo']))
			? self::parseAppInfo($field['appInfo'])
			: []
		;
		$instance->source = self::getSourceFromAppInfo($instance->appInfo);
		return $instance;
	}

	static function parseRestriction($restriction) {
		$ret = [];
		if (!empty($restrictions)) {
			if (is_string($restrictions)) {
				$ret = @json_decode($restrictions, $assoc = true);
				if (null === $ret && 0 !== json_last_error()) {
					throw new Exception("Parse json error for restrictions: " . json_last_error());
				}
			} else if (is_array($restrictions)) {
				$ret = $restrictions;
			} else {
				throw new Exception("Not upported restrictions");
			}
		}
		return $ret;
	}

	static function parseAppInfo($appInfo) {
		$ret = [];
		if (!empty($appInfo)) {
			if (is_string($appInfo)) {
				$ret = @json_decode($appInfo, $assoc = true);
				if (null === $ret && 0 !== json_last_error()) {
					throw new Exception("Parse json error for appInfo: " . json_last_error());
				}
			} else if (is_array($appInfo)) {
				$ret = $appInfo;
			} else {
				throw new Exception("Not upported appInfo");
			}
		}
		return $ret;
	}

	static function getSourceFromAppInfo($appInfo) {
		if (!$appInfo) return 'table';

		// [appInfo] => Array:
		// 		[flat_relation_cache] => Array:
		// 				[@backref_evaluate] => true
		// 				[source] => Array:
		// 						[@ref_engine] => view
		$source_view = (!empty($appInfo['flat_relation_cache']['source']) && 'view' === V::get('@ref_engine', '', $appInfo['flat_relation_cache']['source']));
		$source_backRef = (!empty($appInfo['flat_relation_cache']) && V::get('@backref_evaluate', false, $appInfo['flat_relation_cache']));

		if ($source_backRef) return 'backRef';
		if ($source_view) return 'view';
		return 'table';
	}

	function __isset($name) {
		return (array_key_exists($name, $this->_data));
	}

	function __get($name) {
		if (array_key_exists($name, $this->_data)) {
			return $this->_data[$name];
		}
		return null;
	}

	function __set($name, $value) {
		$this->_data[$name] = $value;
	}

	function toArray() {
		return $this->_data;
	}

	function __toString() {
		return str_replace('"', '',
			str_replace([ '{', '}', '":', ',"' ], [ '{ ', ' }', ': ', ', ' ], json_encode($this->_data))
		);
	}

}

/*
case: install Ref based on backRef - example namespace=default_db/BI_audit_ENERGA_PRACOWNICY/BI_audit_ENERGA_PRACOWNICY

<xs:element ref="default_db__x3A__BI_audit_ENERGA_RUM_KONTRAHENCI_POWIAZANIA_row_object:BI_audit_ENERGA_RUM_KONTRAHENCI_POWIAZANIA_row_object">
	<xs:annotation>
		<xs:appinfo>
			<system_cache__appinfo:flat_relation_cache system_cache__appinfo:backref_evaluate="true">
				<system_cache__appinfo:source system_cache__appinfo:ref_engine="view"/>
			</system_cache__appinfo:flat_relation_cache>
		</xs:appinfo>
	</xs:annotation>
</xs:element>
// [appInfo] => Array:
// 		[flat_relation_cache] => Array:
// 				[@backref_evaluate] => true
// 				[source] => Array:
// 						[@ref_engine] => view

*/