<?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;

            if ($id > 0) {

                // UPDATE existing stock_out record
                $sql = "UPDATE `$table` SET
                            `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"  => $company_id,
                    ":contact_id"  => (int)$data["contact_id"],
                    ":description" => $data["description"],
                    ":log"         => json_encode($table_log),
                ]);

            } else {

                // 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 checks — 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']}."
                    );
                }

                // If user selected a specific lot, verify it matches the rack's stock
                if (!empty($data["lot_number"]) && $source_stock['lot_number'] !== $data["lot_number"]) {
                    throw new Exception(
                        "Rack holds lot '{$source_stock['lot_number']}', not '{$data['lot_number']}'."
                    );
                }

                // If user selected a specific serial, verify it matches the rack's stock
                if (!empty($data["serial_number"]) && $source_stock['serial_number'] !== $data["serial_number"]) {
                    throw new Exception(
                        "Rack holds serial '{$source_stock['serial_number']}', not '{$data['serial_number']}'."
                    );
                }

                // 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'];
                $lot_number    = $source_stock['lot_number']    ?? null;
                $serial_number = $source_stock['serial_number'] ?? null;

                // INSERT new stock_out record.
                // lot_number and serial_number carried from source stock_in row.
                // 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, lot_number, serial_number) 
                        VALUES 
                        (:uuid, :company_id, :date, :product_sku, :quantity, :zone, :aisle, :rack, 
                         :contact_id, :description, :log, 'out', :ref_id, :lot_number, :serial_number)";

                $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,
                    ":lot_number"    => $lot_number,
                    ":serial_number" => $serial_number,
                ]);

                // 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));
?>