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<?php
namespace Common\Database\Datasource;
use Illuminate\Database\Eloquent\Model;
class DatasourceFilters
{
/**
* @var array
*/
private $filters;
/**
* @var Model
*/
private $model;
public function __construct(?string $encodedFilters, Model $model)
{
$this->model = $model;
$this->filters = $this->decodeFilters($encodedFilters);
}
public function getAll(): array
{
return $this->filters;
}
public function empty(): bool
{
return empty($this->filters);
}
public function where(string $key, string $operator, $value): self
{
$this->filters[] = [
'key' => $key,
'operator' => $operator,
'value' => $value,
];
return $this;
}
public function getAndRemove(
string $key,
string $operator = null,
$value = null
): ?array {
// use func_get_args as "null" is a valid value, need
// to check whether if it was actually passed by user
$args = func_get_args();
foreach ($this->filters as $key => $filter) {
if (
$filter['key'] === $args[0] &&
(!isset($args[1]) || $filter['operator'] === $args[1]) &&
(!isset($args[2]) || $filter['value'] === $args[2])
) {
unset($this->filters[$key]);
return $filter;
}
}
return null;
}
private function decodeFilters(?string $filterString): array
{
if ($filterString) {
$filters = json_decode(
base64_decode(urldecode($filterString)),
true,
);
return collect($filters)
->map(function ($filter) {
return $this->normalizeFilter($filter);
})
->filter()
->toArray();
} else {
return [];
}
}
private function normalizeFilter(array $filter): ?array
{
$value = $filter['value'];
$operator = $filter['operator'] ?? '=';
if (is_array($value)) {
// filtering by normalized model
if (isset($value['id'])) {
$value = $value['id'];
// "value" contains both value and operator
} elseif (array_key_exists('value', $value)) {
$operator = $value['operator'] ?? $operator;
$value = $value['value'];
}
}
return [
'key' => $filter['key'],
'operator' => $operator,
'value' => $value,
];
}
}