From 71a0def49836256f132d2c0eb18d9e627e1f6caa Mon Sep 17 00:00:00 2001
From: Jasmin <2211581@stud.hs-mannheim.de>
Date: Wed, 14 Jun 2023 21:29:16 +0200
Subject: [PATCH] Fertig

---
 loeschen_erfolgreich_meine_buecher.php | 81 ++++++++++++++++++++++++--
 1 file changed, 75 insertions(+), 6 deletions(-)

diff --git a/loeschen_erfolgreich_meine_buecher.php b/loeschen_erfolgreich_meine_buecher.php
index 00141c7..6cff8dc 100644
--- a/loeschen_erfolgreich_meine_buecher.php
+++ b/loeschen_erfolgreich_meine_buecher.php
@@ -50,8 +50,9 @@
 </header>
 
 <?php
-    $ID = $_GET['ausleihID'];
+
 $BookID = $_GET['buchID'];
+
 $servername = "localhost";
 $username = "web_b-3";
 $password = "een7Ao6s";
@@ -63,11 +64,79 @@ $connection =
 if (!$connection) {
     die("Verbindung fehlgeschlagen: " . mysqli_connect_error());
 }
-$sql = $connection->prepare("
-DELETE FROM `ausgeliehenes_buch` WHERE `ausgeliehenes_buch`.`AusleihID` = ?;
-UPDATE `buch` SET `Anzahl` = Anzahl+1 WHERE `buch`.`BuchID` = ? ; 
-");
-$sql->bind_param("ii", $ID, $BookID);
+
+$sqlDelete = $connection->prepare("
+DELETE FROM `ausgeliehenes_buch` WHERE `ausgeliehenes_buch`.`AusleihID` = ?;");
+$sqlDelete->bind_param("i", $ID);
+$ID = $_GET['ausleihID'];
+// SQL-Befehl ausführen
+$sqlDelete->execute();
+
+$sqlGetQuantity = $connection->prepare(
+    "SELECT Anzahl, MaxAnzahl FROM `buch` WHERE BuchID = ?;");
+$sqlGetQuantity->bind_param("i", $BookID);
+$sqlGetQuantity->execute();
+// Ergebnis speichern
+$resultGetQuantity = $sqlGetQuantity->get_result();
+if (mysqli_num_rows($resultGetQuantity) > 0) {
+    while($rowGetQuantity = mysqli_fetch_assoc($resultGetQuantity)) {
+        $bookQuantity = $rowGetQuantity['Anzahl'];
+        $bookMaxQuantity = $rowGetQuantity['MaxAnzahl'];
+        $bookTempQuantity = $bookQuantity + 1;
+        $bookTempQuantityNew = $bookMaxQuantity - $bookTempQuantity;
+
+        $sqlGetBorrowedQuantity = $connection->prepare(
+            "SELECT COUNT(*) AS Ausgeliehen 
+            FROM `ausgeliehenes_buch` WHERE BuchID = ?;"
+        );
+        $sqlGetBorrowedQuantity->bind_param("i", $BookID);
+        $sqlGetBorrowedQuantity->execute();
+        // Ergebnis speichern
+        $resultGetBorrowedQuantity = $sqlGetBorrowedQuantity->get_result();
+        if (mysqli_num_rows($resultGetBorrowedQuantity) > 0) {
+            while($rowGetBorrowedQuantity = mysqli_fetch_assoc($resultGetBorrowedQuantity)) {
+                $bookBorrowedQuantity = $rowGetBorrowedQuantity['Ausgeliehen'];
+                
+                if ($bookBorrowedQuantity == $bookTempQuantityNew) {
+                    $sqlUpdateBook = $connection->prepare(
+                        "UPDATE buch SET Anzahl = Anzahl+1 
+                        WHERE buch.BuchID = ? ;"
+                    );
+                    $sqlUpdateBook->bind_param("i", $BookID);
+                    $sqlUpdateBook->execute();
+                }
+                else {
+                    $sqlGetBorrowedID = $connection->prepare(
+                        "SELECT AusleihID 
+                        FROM `ausgeliehenes_buch` 
+                        WHERE BuchID = ? 
+                        AND Reserviert=1 
+                        ORDER BY Enddatum 
+                        DESC LIMIT 1;"
+                    );
+                    $sqlGetBorrowedID->bind_param("i", $BookID);
+                    $sqlGetBorrowedID->execute();
+                    // Ergebnis speichern
+                    $resultGetBorrowedID = $sqlGetBorrowedID->get_result();
+                    if (mysqli_num_rows($resultGetBorrowedID) > 0) {
+                        while($rowGetBorrowedID = mysqli_fetch_assoc($resultGetBorrowedID)) {
+                            $bookBorrowedID = $rowGetBorrowedID['AusleihID'];
+                            $sqlUpdateBookID = $connection->prepare(
+                                "UPDATE `ausgeliehenes_buch` 
+                                SET `Verlängerbar` = '1', 
+                                `Reserviert` = '0' 
+                                WHERE `ausgeliehenes_buch`.`AusleihID` = ?;"
+                            );
+                            $sqlUpdateBookID->bind_param("i", $bookBorrowedID);
+                            $sqlUpdateBookID->execute();
+                            
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
 
 ?>