<?php 
    session_start();
    require '../../../assets/utils/db_auth.php';
    require '../../../assets/utils/classes/WarehouseManager.php';

    try {
        
        dbTransaction($pdo2, function($pdo) use ($data, $company_id, $logging, $uuid) {

            $id = (int)$data['id'];
            $warehouse_id = (int)$data["warehouse"];
            $whMgmt = new WarehouseManager($pdo, $company_id);

            $warehouse = $whMgmt->getStockContext($warehouse_id, $id);
            $row   = $warehouse['row'] ?? [];
            $table = $warehouse['table'];

            // Append this edit/create event to td_stock_<wh>.log (stock record history)
            $table_log = json_decode($row['log'] ?? '[]', true);
            $table_log[] = $logging;

            // Look up the source stock record via the rack.
            // Under 1:1, the rack points to exactly one td_stock_<wh> row.
            $source_stock = $whMgmt->getRackStock(
                $warehouse_id, 
                $data["zone"], 
                $data["aisle"], 
                $data["rack"]
            );

            if (!$source_stock) {
                throw new Exception(
                    "Rack {$data['zone']}-{$data['aisle']}-{$data['rack']} is empty — nothing to take out."
                );
            }

            // Defensive check — UI cascade should already prevent mismatches
            if ($source_stock['product_sku'] !== $data["product_sku"]) {
                throw new Exception(
                    "Rack holds {$source_stock['product_sku']}, not {$data['product_sku']}."
                );
            }

            // Quantity comes from the source stock_in row, NOT user input.
            // Under 1:1, taking from this rack = taking the full batch.
            $quantity = (int) $source_stock['in'];
            $ref_id   = (int) $source_stock['id'];

            if ($id > 0) {

                // UPDATE existing stock_out record
                $sql = "UPDATE `$table` SET
                            `product_sku` = :product_sku,
                            `out`         = :quantity,
                            `zone`        = :zone,
                            `aisle`       = :aisle,
                            `rack`        = :rack,
                            `contact_id`  = :contact_id,
                            `description` = :description,
                            `log`         = :log
                        WHERE id = :id AND company_id = :company_id";

                $sth = $pdo->prepare($sql);
                $sth->execute([
                    ":id"          => $id,
                    ":company_id"  => $company_id,
                    ":product_sku" => $data["product_sku"],
                    ":quantity"    => $quantity,
                    ":zone"        => $data["zone"],
                    ":aisle"       => $data["aisle"],
                    ":rack"        => $data["rack"],
                    ":contact_id"  => (int)$data["contact_id"],
                    ":description" => $data["description"],
                    ":log"         => json_encode($table_log),
                ]);

                // Only touch md_rack if the physical location actually changed.
                $rack_changed = (
                    ($row['zone']  ?? '') != $data['zone']  ||
                    ($row['aisle'] ?? '') != $data['aisle'] ||
                    ($row['rack']  ?? '') != $data['rack']
                );

                if ($rack_changed) {
                    // Re-occupy the old rack with the batch it originally held
                    // (logically: the stock goes back to where it came from)
                    $whMgmt->occupyRack(
                        $warehouse_id,
                        $row['zone'], $row['aisle'], $row['rack'],
                        $row['product_sku'],
                        $row['ref_id'] ?? null
                    );

                    // Release the new rack (the real stock-out action)
                    $whMgmt->releaseRack(
                        $warehouse_id,
                        $data['zone'], $data['aisle'], $data['rack']
                    );
                }

            } else {

                // INSERT new stock_out record.
                // ref_id links this stock_out row back to the stock_in batch it consumed.
                $sql = "INSERT INTO `$table` 
                        (uuid, company_id, `date`, product_sku, `out`, zone, aisle, rack, 
                         contact_id, `description`, `log`, `type`, ref_id) 
                        VALUES 
                        (:uuid, :company_id, :date, :product_sku, :quantity, :zone, :aisle, :rack, 
                         :contact_id, :description, :log, 'out', :ref_id)";

                $sth = $pdo->prepare($sql);
                $sth->execute([
                    ":uuid"        => $uuid,
                    ":company_id"  => $company_id,
                    ":date"        => date('Y-m-d H:i:s'),
                    ":product_sku" => $data["product_sku"],
                    ":quantity"    => $quantity,
                    ":zone"        => $data["zone"],
                    ":aisle"       => $data["aisle"],
                    ":rack"        => $data["rack"],
                    ":contact_id"  => (int)$data["contact_id"],
                    ":description" => $data["description"],
                    ":log"         => json_encode($table_log),
                    ":ref_id"      => $ref_id,
                ]);

                // Release the rack — stock is now gone from this location.
                $whMgmt->releaseRack(
                    $warehouse_id, 
                    $data["zone"], $data["aisle"], $data["rack"]
                );
            }

            // Balance: total_out increases by delta.
            //   INSERT: $row['out'] = 0   → delta = full quantity
            //   UPDATE: $row['out'] = old → delta = new - old
            $whMgmt->adjustBalance(
                'out', 
                $warehouse_id, 
                $data["product_sku"], 
                $row['out'] ?? 0, 
                $quantity
            );

        });

        $answer["success"] = 1;

    } catch (PDOException $e) {
        $answer["success"] = 0;
        $answer["message"] = "Database error, please try again";
        http_response_code(500);

    } catch (Exception $e) {
        $answer["success"] = 0;
        $answer["message"] = $e->getMessage();
        http_response_code(400);
    }

    exit(json_encode($answer));
?>