Add window() function to Query Builder

Signed-off-by: davidarendsen <davidarendsen@hey.com>

src/Functions/Window.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace Arendsen\FluxQueryBuilder\Functions;
+
+use Arendsen\FluxQueryBuilder\Type;
+use Arendsen\FluxQueryBuilder\Type\ArrayType;
+use Arendsen\FluxQueryBuilder\Type\DurationType;
+
+class Window extends Base
+{
+    /**
+     * @var string $every
+     */
+    private $every;
+
+    /**
+     * @var string|null $period
+     */
+    private $period;
+
+    /**
+     * @var string|null $offset
+     */
+    private $offset;
+
+    /**
+     * @var string|null $location
+     */
+    private $location;
+
+    /**
+     * @var string|null $timeColumn
+     */
+    private $timeColumn;
+
+    /**
+     * @var string|null $startColumn
+     */
+    private $startColumn;
+
+    /**
+     * @var string|null $stopColumn
+     */
+    private $stopColumn;
+
+    /**
+     * @var bool $createEmpty
+     */
+    private $createEmpty;
+
+    public function __construct(
+        $every,
+        ?string $period = null,
+        ?string $offset = null,
+        ?string $location = null,
+        ?string $timeColumn = null,
+        ?string $startColumn = null,
+        ?string $stopColumn = null,
+        bool $createEmpty = false
+    ) {
+        $this->every = $every;
+        $this->period = $period;
+        $this->offset = $offset;
+        $this->location = $location;
+        $this->timeColumn = $timeColumn;
+        $this->startColumn = $startColumn;
+        $this->stopColumn = $stopColumn;
+        $this->createEmpty = $createEmpty;
+    }
+
+    public function __toString()
+    {
+        $input = new ArrayType(array_filter([
+            'every' => new DurationType($this->every),
+            'period' => $this->period ? new DurationType($this->period) : null,
+            'offset' => $this->offset ? new DurationType($this->offset) : null,
+            'location' => $this->location ? new Type($this->location) : null,
+            'timeColumn' => $this->timeColumn ? new Type($this->timeColumn) : null,
+            'startColumn' => $this->startColumn ? new Type($this->startColumn) : null,
+            'stopColumn' => $this->stopColumn ? new Type($this->stopColumn) : null,
+            'createEmpty' => $this->createEmpty ? new Type($this->createEmpty) : null,
+        ]));
+        return '|> window(' . $input . ') ';
+    }
+}