first commit

common/Database/Metrics/TrendDateExpression.php

@@ -0,0 +1,87 @@
+<?php
+
+namespace Common\Database\Metrics;
+
+use Carbon\CarbonImmutable;
+use DateTime;
+use DateTimeZone;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Grammar;
+use Illuminate\Database\Query\Expression;
+
+class TrendDateExpression extends Expression
+{
+    public function __construct(
+        protected Builder $query,
+        protected string $column,
+        protected string $unit,
+        protected string $timezone,
+    ) {
+    }
+
+    public function getValue(Grammar $grammar): string
+    {
+        // dates in database are stored in UTC, and date_format will not return hour in many cases, so we need
+        // to convert date_format result to specified timezone in mysql because it can use the full timestamp
+        $offset = $this->offset();
+        if ($offset > 0) {
+            $interval = '+ INTERVAL ' . $offset . ' HOUR';
+        } elseif ($offset === 0) {
+            $interval = '';
+        } else {
+            $interval = '- INTERVAL ' . $offset * -1 . ' HOUR';
+        }
+
+        switch ($this->unit) {
+            case 'year':
+                return "date_format({$this->wrap(
+                    $this->column,
+                )} {$interval}, '%Y')";
+            case 'month':
+                return "date_format({$this->wrap(
+                    $this->column,
+                )} {$interval}, '%Y-%m')";
+            case 'week':
+                return "date_format({$this->wrap(
+                    $this->column,
+                )} {$interval}, '%x-%v')";
+            case 'day':
+                return "date_format({$this->wrap(
+                    $this->column,
+                )} {$interval}, '%Y-%m-%d')";
+            case 'hour':
+                return "date_format({$this->wrap(
+                    $this->column,
+                )} {$interval}, '%Y-%m-%d %H:00')";
+            case 'minute':
+                return "date_format({$this->wrap(
+                    $this->column,
+                )} {$interval}, '%Y-%m-%d %H:%i:00')";
+        }
+    }
+
+    protected function wrap(string $value): string
+    {
+        return $this->query
+            ->getQuery()
+            ->getGrammar()
+            ->wrap($value);
+    }
+
+    protected function offset(): int
+    {
+        $timezoneOffset = function ($timezone) {
+            return (new DateTime(
+                CarbonImmutable::now()->format('Y-m-d H:i:s'),
+                new DateTimeZone($timezone),
+            ))->getOffset() /
+                60 /
+                60;
+        };
+
+        $appOffset = $timezoneOffset(config('app.timezone'));
+        $userOffset = $timezoneOffset($this->timezone);
+
+        return $userOffset - $appOffset;
+    }
+}