Refresh stock forecast after each sale

modules/erp/lager/forecast.php

@@ -45,11 +45,27 @@ function lager_forecast_load_current_lots(PDO $pdo): array
     return $stmt->fetchAll();
 }
 
-function lager_forecast_load_daily_sales(PDO $pdo, DateTimeImmutable $asOfDate, int $lookbackDays): array
+function lager_forecast_load_current_lot(PDO $pdo, int $productId): ?array
+{
+    $stmt = $pdo->prepare(
+        "SELECT p.id AS product_id, p.sku, sl.id AS lot_id,
+                COALESCE(v.qty_net, 0) AS physical_qty
+         FROM product p
+         LEFT JOIN stock_lot sl ON sl.product_id = p.id AND sl.status = 'current'
+         LEFT JOIN v_stock_lot_balance v ON v.stock_lot_id = sl.id
+         WHERE p.status = 'active' AND p.id = :product_id
+         LIMIT 1"
+    );
+    $stmt->execute([':product_id' => $productId]);
+    $row = $stmt->fetch();
+    return is_array($row) ? $row : null;
+}
+
+function lager_forecast_load_daily_sales(PDO $pdo, DateTimeImmutable $asOfDate, int $lookbackDays, ?int $productId = null): array
 {
     $startDate = $asOfDate->modify('-' . ($lookbackDays - 1) . ' days')->format('Y-m-d');
     $endDate = $asOfDate->modify('+1 day')->format('Y-m-d');
-    $stmt = $pdo->prepare(
+    $sql =
         "SELECT a.product_id, so.order_date::DATE AS sale_date,
                 SUM(a.qty * GREATEST(sol.qty - sol.qty_cancelled, 0) / NULLIF(sol.qty, 0)) AS units
          FROM sales_order_line_lot_allocation a
@@ -61,11 +77,15 @@ function lager_forecast_load_daily_sales(PDO $pdo, DateTimeImmutable $asOfDate,
            AND sol.line_status <> 'cancelled'
            AND so.order_status <> 'cancelled'
            AND so.order_date >= :start_date::DATE
-           AND so.order_date < :end_date::DATE
-         GROUP BY a.product_id, so.order_date::DATE
-         ORDER BY a.product_id, sale_date"
-    );
-    $stmt->execute([':start_date' => $startDate, ':end_date' => $endDate]);
+           AND so.order_date < :end_date::DATE";
+    $params = [':start_date' => $startDate, ':end_date' => $endDate];
+    if ($productId !== null) {
+        $sql .= ' AND a.product_id = :product_id';
+        $params[':product_id'] = $productId;
+    }
+    $sql .= ' GROUP BY a.product_id, so.order_date::DATE ORDER BY a.product_id, sale_date';
+    $stmt = $pdo->prepare($sql);
+    $stmt->execute($params);
 
     $sales = [];
     foreach ($stmt->fetchAll() as $row) {
@@ -136,7 +156,10 @@ function lager_forecast_calculate(DateTimeImmutable $asOfDate, float $physicalQt
 
 function lager_forecast_persist(PDO $pdo, array $lot, array $forecast, DateTimeImmutable $asOfDate): void
 {
-    $pdo->beginTransaction();
+    $startedTransaction = !$pdo->inTransaction();
+    if ($startedTransaction) {
+        $pdo->beginTransaction();
+    }
     try {
         $stmt = $pdo->prepare(
             "INSERT INTO stock_lot_forecast_history (
@@ -172,15 +195,38 @@ function lager_forecast_persist(PDO $pdo, array $lot, array $forecast, DateTimeI
             ':confidence' => $forecast['confidence'], ':daily_demand' => $forecast['daily_demand'],
             ':lot_id' => (int) $lot['lot_id'],
         ]);
-        $pdo->commit();
+        if ($startedTransaction) {
+            $pdo->commit();
+        }
     } catch (Throwable $error) {
-        if ($pdo->inTransaction()) {
+        if ($startedTransaction && $pdo->inTransaction()) {
             $pdo->rollBack();
         }
         throw $error;
     }
 }
 
+function refresh_lager_stock_lot_forecast_for_product(PDO $pdo, int $productId): void
+{
+    if ($productId <= 0) {
+        throw new InvalidArgumentException('Produkt-ID fuer Forecast fehlt');
+    }
+
+    $lot = lager_forecast_load_current_lot($pdo, $productId);
+    if ($lot === null || $lot['lot_id'] === null) {
+        throw new RuntimeException("Keine aktuelle Charge fuer Produkt {$productId} vorhanden");
+    }
+
+    $asOfDate = new DateTimeImmutable('today', new DateTimeZone('Europe/Zurich'));
+    $dailySales = lager_forecast_load_daily_sales($pdo, $asOfDate, 365, $productId);
+    $forecast = lager_forecast_calculate(
+        $asOfDate,
+        (float) $lot['physical_qty'],
+        $dailySales[$productId] ?? []
+    );
+    lager_forecast_persist($pdo, $lot, $forecast, $asOfDate);
+}
+
 function run_lager_stock_lot_forecast(PDO $pdo): array
 {
     $runId = lager_forecast_start_run($pdo);