first commit

common/Database/Metrics/Trend.php

@@ -0,0 +1,71 @@
+<?php
+
+namespace Common\Database\Metrics;
+
+use Common\Database\Metrics\Traits\GeneratesTrendResults;
+use Illuminate\Support\Carbon;
+use Illuminate\Support\Facades\DB;
+
+class Trend extends BaseMetric
+{
+    use GeneratesTrendResults;
+
+    protected function aggregate(string $function): array
+    {
+        $expression = new TrendDateExpression(
+            $this->query,
+            $this->dateColumn,
+            $this->dateRange->granularity,
+            $this->dateRange->timezone,
+        );
+
+        $results = $this->query
+            ->select(
+                DB::raw(
+                    "{$expression->getValue(
+                        DB::connection()->getQueryGrammar(),
+                    )} as date_result, {$function}({$this->getWrappedColumn()}) as aggregate",
+                ),
+            )
+            ->whereBetween($this->dateColumn, [
+                $this->dateRange->start,
+                $this->dateRange->end,
+            ])
+            ->groupBy(DB::raw($expression))
+            ->orderBy('date_result')
+            ->limit($this->limit)
+            ->get();
+
+        $mergedResults = array_replace(
+            $this->getAllPossibleDateResults($this->dateRange),
+            $results
+                ->mapWithKeys(function ($result) {
+                    return [
+                        (string) $result->date_result => $this->formatTrendResult(
+                            $this->dateRange->granularity,
+                            $this->parseMysqlDate($result->date_result),
+                            $result->aggregate,
+                        ),
+                    ];
+                })
+                ->all(),
+        );
+
+        return array_values($mergedResults);
+    }
+
+    protected function parseMysqlDate(string $mysqlDate): Carbon
+    {
+        // dates coming from mysql will be in user's timezone (due to + Interval x HOUR),
+        // set user's timezone on carbon as well, so that "toIsoString" will return correct date.
+        if ($this->dateRange->granularity === $this->dateRange::WEEK) {
+            [$year, $week] = explode('-', $mysqlDate);
+            return Carbon::today($this->dateRange->timezone)->setISODate(
+                (int) $year,
+                (int) $week,
+            );
+        } else {
+            return Carbon::parse($mysqlDate, $this->dateRange->timezone);
+        }
+    }
+}