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1<?php
2
3declare(strict_types=1);
4
5/**
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; under version 2
9 * of the License (non-upgradable).
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
19 *
20 * Copyright (c) 2013 (original work) Open Assessment Technologies S.A.
21 *
22 * @author "Patrick Plichart, <patrick@taotesting.com>"
23 *
24 * An Assessment Result is used to report the results of a candidate's interaction
25 * with a test and/or one or more items attempted. Information about the test is optional,
26 * in some systems it may be possible to interact with items that are not organized into a
27 * test at all. For example, items that are organized with learning resources and presented
28 * individually in a formative context.
29 */
30
31// phpcs:disable PSR1.Classes.ClassDeclaration.MissingNamespace,Squiz.Classes.ValidClassName.NotCamelCaps
32abstract class taoResultServer_models_classes_Variable implements JsonSerializable
33{
34    public const CARDINALITY_SINGLE = 'single';
35    public const CARDINALITY_MULTIPLE = 'multiple';
36    public const CARDINALITY_ORDERED = 'ordered';
37    public const CARDINALITY_RECORD = 'record';
38
39    public const TYPE_VARIABLE_INTEGER = 'integer';
40    public const TYPE_VARIABLE_BOOLEAN = 'boolean';
41    public const TYPE_VARIABLE_IDENTIFIER = 'identifier';
42    public const TYPE_VARIABLE_DURATION = 'duration';
43    public const TYPE_VARIABLE_FLOAT = 'float';
44
45    /**
46     * The purpose of an itemVariable is to report the value of the item variable with the given identifier.
47     *
48     * @var string|null
49     */
50    protected $identifier;
51
52    /**
53     * The cardinality of the variable, taken from the corresponding declaration or definition.
54     *
55     * @var string|null {single, multiple, ordered, record}
56     */
57    protected $cardinality;
58
59    /**
60     * The base type of the variable, taken from the corresponding declaration of definition.
61     * This value is omitted only for variables with record cardinality.
62     *
63     * @var string|null should move to an enumeration
64     */
65    protected $baseType;
66
67    /**
68     * The epoch when the variable has been last modified
69     *
70     * @var string|null
71     */
72    protected $epoch;
73
74    private bool $isExternallyGraded = false;
75
76    abstract protected function getType(): string;
77
78    public function setIdentifier(string $identifier): self
79    {
80        $this->identifier = $identifier;
81
82        return $this;
83    }
84
85    public function getIdentifier(): ?string
86    {
87        return $this->identifier;
88    }
89
90    /**
91     * @throws common_exception_InvalidArgumentType
92     */
93    public function setCardinality($cardinality = self::CARDINALITY_SINGLE): self
94    {
95        if (
96            !in_array(
97                $cardinality,
98                [
99                    self::CARDINALITY_SINGLE,
100                    self::CARDINALITY_MULTIPLE,
101                    self::CARDINALITY_ORDERED,
102                    self::CARDINALITY_RECORD,
103                ],
104                true
105            )
106        ) {
107            throw new common_exception_InvalidArgumentType('cardinality');
108        }
109
110        $this->cardinality = $cardinality;
111
112        return $this;
113    }
114
115    public function getCardinality(): ?string
116    {
117        return $this->cardinality;
118    }
119
120    public function setBaseType(string $baseType): self
121    {
122        $this->baseType = $baseType;
123
124        return $this;
125    }
126
127    public function getBaseType(): ?string
128    {
129        return $this->baseType;
130    }
131
132    public function setEpoch(string $epoch): self
133    {
134        $this->epoch = $epoch;
135
136        return $this;
137    }
138
139    public function getEpoch(): ?string
140    {
141        return $this->epoch;
142    }
143
144    public function getCreationTime(): ?float
145    {
146        if (!isset($this->epoch)) {
147            return null;
148        }
149        [$usec, $sec] = explode(' ', $this->epoch);
150
151        return ((float)$usec + (float)$sec);
152    }
153
154    public function isSetEpoch(): bool
155    {
156        return (isset($this->epoch));
157    }
158
159    public function isMultiple(): bool
160    {
161        return in_array($this->cardinality, [self::CARDINALITY_MULTIPLE, self::CARDINALITY_ORDERED], true);
162    }
163
164    /**
165     * get the value of the variable
166     *
167     * @return mixed
168     */
169    abstract public function getValue();
170
171    /**
172     * Set the value of the variable
173     *
174     * @param $value mixed
175     */
176    abstract public function setValue($value);
177
178    /**
179     * @deprecated Use jsonSerialize method instead
180     */
181    public function toJson(): string
182    {
183        return json_encode($this);
184    }
185
186    /**
187     * {@inheritdoc}
188     */
189    public function jsonSerialize()
190    {
191        return [
192            'identifier' => $this->identifier,
193            'cardinality' => $this->cardinality,
194            'baseType' => $this->baseType,
195            'epoch' => $this->epoch,
196            'type' => $this->getType(),
197            'externallyGraded' => $this->getExternallyGraded(),
198        ];
199    }
200
201    /**
202     * @return taoResultServer_models_classes_OutcomeVariable|taoResultServer_models_classes_ResponseVariable|taoResultServer_models_classes_TraceVariable
203     * @throws common_exception_InvalidArgumentType
204     * @throws LogicException
205     */
206    public static function fromData(array $rawVariable)
207    {
208        self::validateKeys(['identifier', 'cardinality', 'baseType', 'epoch', 'type'], $rawVariable);
209
210        switch ($rawVariable['type']) {
211            case taoResultServer_models_classes_OutcomeVariable::TYPE:
212                $variable = self::fromOutcomeVariableData($rawVariable);
213                break;
214            case taoResultServer_models_classes_ResponseVariable::TYPE:
215                $variable = self::fromResponseVariableData($rawVariable);
216                break;
217            case taoResultServer_models_classes_TraceVariable::TYPE:
218                $variable = self::fromTraceVariableData($rawVariable);
219                break;
220            default:
221                throw new \LogicException(sprintf('Unsupported variable type: %s', $rawVariable['type']));
222        }
223
224        if (isset($rawVariable['baseType'])) {
225            $variable->setBaseType($rawVariable['baseType']);
226        }
227
228        return $variable
229            ->setIdentifier($rawVariable['identifier'])
230            ->setCardinality($rawVariable['cardinality'])
231            ->setEpoch($rawVariable['epoch']);
232    }
233
234    /**
235     * @throws LogicException
236     */
237    protected static function validateKeys(array $keys, array $data): void
238    {
239        foreach ($keys as $key) {
240            if (!array_key_exists($key, $data)) {
241                throw new LogicException(sprintf('Key "%s" is not defined in variable data.', $key));
242            }
243        }
244    }
245
246    private static function fromOutcomeVariableData(
247        array $rawOutcomeVariable
248    ): taoResultServer_models_classes_OutcomeVariable {
249        self::validateKeys(['normalMinimum', 'normalMaximum', 'value'], $rawOutcomeVariable);
250
251        return (new taoResultServer_models_classes_OutcomeVariable())
252            ->setNormalMinimum($rawOutcomeVariable['normalMinimum'])
253            ->setNormalMaximum($rawOutcomeVariable['normalMaximum'])
254            ->setEncodedValue($rawOutcomeVariable['value'])
255            ->setExternallyGraded($rawOutcomeVariable['externallyGraded'] ?? false);
256    }
257
258    private static function fromResponseVariableData(
259        array $rawResponseVariable
260    ): taoResultServer_models_classes_ResponseVariable {
261        self::validateKeys(['correctResponse', 'candidateResponse'], $rawResponseVariable);
262
263        return (new taoResultServer_models_classes_ResponseVariable())
264            ->setCorrectResponse($rawResponseVariable['correctResponse'])
265            ->setEncodedCandidateResponse($rawResponseVariable['candidateResponse']);
266    }
267
268    private static function fromTraceVariableData(array $rawTraceVariable): taoResultServer_models_classes_TraceVariable
269    {
270        self::validateKeys(['trace'], $rawTraceVariable);
271
272        return (new taoResultServer_models_classes_TraceVariable())->setTrace($rawTraceVariable['trace']);
273    }
274
275    public function setExternallyGraded(bool $flag): self
276    {
277        $this->isExternallyGraded = $flag;
278
279        return $this;
280    }
281
282    public function getExternallyGraded(): bool
283    {
284        return $this->isExternallyGraded;
285    }
286}