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<?php
abstract class model {
const DB_TABLE = null;
const DB_KEY = 'id';
const STRING = 0;
const INTEGER = 1;
const FLOAT = 2;
const ARRAY = 3;
const BOOLEAN = 4;
const JSON = 5;
const SERIALIZED = 6;
protected static array $SpecCache = [];
public static function create_instance(...$args) {
$cl = get_called_class();
return new $cl(...$args);
}
public function __construct(array $raw) {
if (!isset(self::$SpecCache[static::class])) {
list($fields, $model_name_map, $db_name_map) = static::get_spec();
self::$SpecCache[static::class] = [
'fields' => $fields,
'model_name_map' => $model_name_map,
'db_name_map' => $db_name_map
];
}
foreach (self::$SpecCache[static::class]['fields'] as $field)
$this->{$field['model_name']} = self::cast_to_type($field['type'], $raw[$field['db_name']]);
if (is_null(static::DB_TABLE))
trigger_error('class '.get_class($this).' doesn\'t have DB_TABLE defined');
}
/**
* @param $fields
*
* TODO: support adding or subtracting (SET value=value+1)
*/
public function edit($fields) {
$db = getDB();
$model_upd = [];
$db_upd = [];
foreach ($fields as $name => $value) {
$index = self::$SpecCache[static::class]['db_name_map'][$name] ?? null;
if (is_null($index)) {
debugError(__METHOD__.': field `'.$name.'` not found in '.static::class);
continue;
}
$field = self::$SpecCache[static::class]['fields'][$index];
switch ($field['type']) {
case self::ARRAY:
if (is_array($value)) {
$db_upd[$name] = implode(',', $value);
$model_upd[$field['model_name']] = $value;
} else {
debugError(__METHOD__.': field `'.$name.'` is expected to be array. skipping.');
}
break;
case self::INTEGER:
$value = (int)$value;
$db_upd[$name] = $value;
$model_upd[$field['model_name']] = $value;
break;
case self::FLOAT:
$value = (float)$value;
$db_upd[$name] = $value;
$model_upd[$field['model_name']] = $value;
break;
case self::BOOLEAN:
$db_upd[$name] = $value ? 1 : 0;
$model_upd[$field['model_name']] = $value;
break;
case self::JSON:
$db_upd[$name] = jsonEncode($value);
$model_upd[$field['model_name']] = $value;
break;
case self::SERIALIZED:
$db_upd[$name] = serialize($value);
$model_upd[$field['model_name']] = $value;
break;
default:
$value = (string)$value;
$db_upd[$name] = $value;
$model_upd[$field['model_name']] = $value;
break;
}
}
if (!empty($db_upd) && !$db->update(static::DB_TABLE, $db_upd, static::DB_KEY."=?", $this->get_id())) {
debugError(__METHOD__.': failed to update database');
return;
}
if (!empty($model_upd)) {
foreach ($model_upd as $name => $value)
$this->{$name} = $value;
}
}
public function get_id() {
return $this->{to_camel_case(static::DB_KEY)};
}
public function as_array(array $fields = [], array $custom_getters = []): array {
if (empty($fields))
$fields = array_keys(static::$SpecCache[static::class]['db_name_map']);
$array = [];
foreach ($fields as $field) {
if (isset($custom_getters[$field]) && is_callable($custom_getters[$field])) {
$array[$field] = $custom_getters[$field]();
} else {
$array[$field] = $this->{to_camel_case($field)};
}
}
return $array;
}
protected static function cast_to_type(int $type, $value) {
switch ($type) {
case self::BOOLEAN:
return (bool)$value;
case self::INTEGER:
return (int)$value;
case self::FLOAT:
return (float)$value;
case self::ARRAY:
return array_filter(explode(',', $value));
case self::JSON:
$val = jsonDecode($value);
if (!$val)
$val = null;
return $val;
case self::SERIALIZED:
$val = unserialize($value);
if ($val === false)
$val = null;
return $val;
default:
return (string)$value;
}
}
protected static function get_spec(): array {
$rc = new ReflectionClass(static::class);
$props = $rc->getProperties(ReflectionProperty::IS_PUBLIC);
$list = [];
$index = 0;
$model_name_map = [];
$db_name_map = [];
foreach ($props as $prop) {
if ($prop->isStatic())
continue;
$name = $prop->getName();
if (startsWith($name, '_'))
continue;
$type = $prop->getType();
$phpdoc = $prop->getDocComment();
$mytype = null;
if (!$prop->hasType() && !$phpdoc)
$mytype = self::STRING;
else {
$typename = $type->getName();
switch ($typename) {
case 'string':
$mytype = self::STRING;
break;
case 'int':
$mytype = self::INTEGER;
break;
case 'float':
$mytype = self::FLOAT;
break;
case 'array':
$mytype = self::ARRAY;
break;
case 'bool':
$mytype = self::BOOLEAN;
break;
}
if ($phpdoc != '') {
$pos = strpos($phpdoc, '@');
if ($pos === false)
continue;
if (substr($phpdoc, $pos+1, 4) == 'json')
$mytype = self::JSON;
else if (substr($phpdoc, $pos+1, 5) == 'array')
$mytype = self::ARRAY;
else if (substr($phpdoc, $pos+1, 10) == 'serialized')
$mytype = self::SERIALIZED;
}
}
if (is_null($mytype))
debugError(__METHOD__.": ".$name." is still null in ".static::class);
$dbname = from_camel_case($name);
$list[] = [
'type' => $mytype,
'model_name' => $name,
'db_name' => $dbname
];
$model_name_map[$name] = $index;
$db_name_map[$dbname] = $index;
$index++;
}
return [$list, $model_name_map, $db_name_map];
}
}
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