380 lines
14 KiB
PHP
380 lines
14 KiB
PHP
<?php
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/**
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* WarehouseManager
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*
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* Encapsulates all warehouse-related operations:
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* - Warehouse lookup and stock context resolution
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* - Rack lifecycle (sync with md_storage ranges)
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* - Warehouse balance adjustments (warehouse_balance table)
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*
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* Note: Methods that modify data do NOT manage their own DB transactions.
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* Callers are responsible for wrapping operations in dbTransaction() when atomicity is needed.
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*/
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class WarehouseManager {
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private $pdo;
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private $company_id;
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public function __construct($pdo, $company_id) {
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$this->pdo = $pdo;
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$this->company_id = $company_id;
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}
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// ─────────────────────────────────────────────────────────────
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// Warehouse lookup
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// ─────────────────────────────────────────────────────────────
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/**
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* Fetch the warehouse name by its ID.
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*/
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public function getWarehouseName($warehouse_id) {
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$sql = "SELECT warehouse_name FROM md_warehouse
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WHERE company_id = :company_id AND id = :warehouse_id";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":company_id" => $this->company_id,
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":warehouse_id" => $warehouse_id
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]);
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return $sth->fetchColumn();
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}
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/**
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* Resolve the per-warehouse stock table and (optionally) fetch a specific row.
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* Returns: ['table' => 'td_stock_xxx', 'name' => 'xxx', 'row' => [...] | []]
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*/
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public function getStockContext($warehouse_id, $id) {
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$name = $this->getWarehouseName($warehouse_id);
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// Sanitize table suffix to prevent SQL injection
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$safe_name = preg_replace('/[^a-zA-Z0-9_]/', '', $name);
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$table = "td_stock_" . $safe_name;
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if (empty($id)) {
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return [
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'table' => $table,
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'name' => $name,
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'row' => []
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];
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}
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$sql = "SELECT * FROM `$table`
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WHERE company_id = :company_id AND id = :id";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":company_id" => $this->company_id,
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":id" => $id
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]);
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return [
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'table' => $table,
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'name' => $name,
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'row' => $sth->fetch(PDO::FETCH_ASSOC) ?: []
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];
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}
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// ─────────────────────────────────────────────────────────────
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// Warehouse balance (warehouse_balance table)
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// ─────────────────────────────────────────────────────────────
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/**
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* Adjust the running balance for a (warehouse, SKU) pair.
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*
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* Used by stock_in / stock_out engines to keep warehouse_balance in sync with movements.
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* The delta-based update (-old_qty + new_qty) supports both create and edit flows.
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*/
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public function adjustBalance($type, $warehouse_id, $product_sku, $old_qty, $new_qty) {
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// Upsert the balance row (atomic, no race condition)
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$column = $type === 'in' ? 'total_in' : 'total_out';
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$delta = $new_qty - $old_qty;
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$sql = "INSERT INTO warehouse_balance
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(company_id, warehouse_id, product_sku, `$column`)
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VALUES
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(:company_id, :warehouse_id, :product_sku, :delta)
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ON DUPLICATE KEY UPDATE
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`$column` = `$column` + VALUES(`$column`)";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":company_id" => $this->company_id,
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":warehouse_id" => $warehouse_id,
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":product_sku" => $product_sku,
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":delta" => $delta
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]);
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}
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// ─────────────────────────────────────────────────────────────
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// Rack lifecycle (md_rack table)
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// ─────────────────────────────────────────────────────────────
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/**
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* Ensure md_rack rows match the md_storage range.
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*
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* - Validates no occupied racks fall outside the new range
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* - Deletes racks outside the new range
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* - Inserts new racks inside the range (INSERT IGNORE skips existing)
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*
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* Must be called inside a DB transaction by the caller.
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*
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* @param int $storage_id The md_storage.id this range belongs to
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* @param array $range Keys: warehouse, zone, aisle_from, aisle_to, rack_from, rack_to
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* @throws Exception if occupied racks would be removed
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*/
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public function syncRacks(int $storage_id, array $range): void {
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$this->validateRangeChange($storage_id, $range);
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$this->removeRacksOutsideRange($storage_id, $range);
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$this->insertRacksInRange($storage_id, $range);
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}
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/**
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* Guard: reject the update if any occupied rack would be removed.
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*/
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private function validateRangeChange(int $storage_id, array $range): void {
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$sql = "SELECT COUNT(*) FROM md_rack
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WHERE company_id = :company_id
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AND storage_id = :storage_id
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AND product_sku IS NOT NULL
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AND (
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CAST(aisle AS UNSIGNED) < :aisle_from OR
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CAST(aisle AS UNSIGNED) > :aisle_to OR
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CAST(rack AS UNSIGNED) < :rack_from OR
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CAST(rack AS UNSIGNED) > :rack_to
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)";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":company_id" => $this->company_id,
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":storage_id" => $storage_id,
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":aisle_from" => (int) $range['aisle_from'],
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":aisle_to" => (int) $range['aisle_to'],
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":rack_from" => (int) $range['rack_from'],
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":rack_to" => (int) $range['rack_to'],
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]);
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if ($sth->fetchColumn() > 0) {
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throw new Exception("Cannot shrink range — some racks still have stock");
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}
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}
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/**
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* Delete empty racks that fall outside the new range.
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*/
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private function removeRacksOutsideRange(int $storage_id, array $range): void {
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$sql = "DELETE FROM md_rack
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WHERE company_id = :company_id
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AND storage_id = :storage_id
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AND (
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CAST(aisle AS UNSIGNED) < :aisle_from OR
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CAST(aisle AS UNSIGNED) > :aisle_to OR
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CAST(rack AS UNSIGNED) < :rack_from OR
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CAST(rack AS UNSIGNED) > :rack_to
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)";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":company_id" => $this->company_id,
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":storage_id" => $storage_id,
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":aisle_from" => (int) $range['aisle_from'],
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":aisle_to" => (int) $range['aisle_to'],
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":rack_from" => (int) $range['rack_from'],
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":rack_to" => (int) $range['rack_to'],
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]);
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}
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/**
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* Insert rack rows for the full range (IGNORE skips duplicates).
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*/
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private function insertRacksInRange(int $storage_id, array $range): void {
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$sql = "INSERT IGNORE INTO md_rack
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(company_id, warehouse, storage_id, zone, aisle, rack)
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VALUES
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(:company_id, :warehouse, :storage_id, :zone, :aisle, :rack)";
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$sth = $this->pdo->prepare($sql);
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$aisle_from = (int) $range['aisle_from'];
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$aisle_to = (int) $range['aisle_to'];
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$rack_from = (int) $range['rack_from'];
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$rack_to = (int) $range['rack_to'];
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for ($a = $aisle_from; $a <= $aisle_to; $a++) {
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for ($r = $rack_from; $r <= $rack_to; $r++) {
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$sth->execute([
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":company_id" => $this->company_id,
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":warehouse" => $range['warehouse'],
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":storage_id" => $storage_id,
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":zone" => $range['zone'],
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":aisle" => (string) $a,
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":rack" => (string) $r,
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]);
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}
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}
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}
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// ─────────────────────────────────────────────────────────────
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// Rack occupancy (md_rack.product_sku state)
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// ─────────────────────────────────────────────────────────────
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/**
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* Assign a product SKU to an empty rack.
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*
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* @throws Exception if the rack is already occupied by a different SKU
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* or if the rack doesn't exist.
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*/
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public function occupyRack($warehouse_id, $zone, $aisle, $rack, $product_sku): void {
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// Lock and check the rack's current state
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$sql = "SELECT id, product_sku FROM md_rack
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WHERE company_id = :company_id
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AND warehouse = :warehouse
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AND zone = :zone
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AND aisle = :aisle
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AND rack = :rack
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FOR UPDATE";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":company_id" => $this->company_id,
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":warehouse" => $warehouse_id,
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":zone" => $zone,
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":aisle" => $aisle,
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":rack" => $rack,
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]);
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$current = $sth->fetch(PDO::FETCH_ASSOC);
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if (!$current) {
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throw new Exception("Rack {$zone}-{$aisle}-{$rack} does not exist");
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}
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if ($current['product_sku'] !== null
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&& $current['product_sku'] !== $product_sku) {
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throw new Exception(
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"Rack {$zone}-{$aisle}-{$rack} is already occupied by {$current['product_sku']}"
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);
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}
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// Assign the SKU
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$sql = "UPDATE md_rack
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SET product_sku = :product_sku
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WHERE id = :id";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":product_sku" => $product_sku,
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":id" => $current['id'],
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]);
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}
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/**
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* Release a rack (set product_sku to NULL).
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*/
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public function releaseRack($warehouse_id, $zone, $aisle, $rack): void {
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$sql = "UPDATE md_rack
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SET product_sku = NULL
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WHERE company_id = :company_id
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AND warehouse = :warehouse
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AND zone = :zone
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AND aisle = :aisle
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AND rack = :rack";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":company_id" => $this->company_id,
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":warehouse" => $warehouse_id,
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":zone" => $zone,
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":aisle" => $aisle,
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":rack" => $rack,
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]);
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}
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/**
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* Move a rack assignment from one location to another.
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*
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* Source rack must be occupied, destination rack must be empty.
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* Locks both racks (lower ID first) to avoid deadlocks.
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*/
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public function transferRack(
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$from_warehouse, $from_zone, $from_aisle, $from_rack,
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$to_warehouse, $to_zone, $to_aisle, $to_rack
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): void {
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// Fetch both racks with FOR UPDATE, ordered by id to prevent deadlocks
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$sql = "SELECT id, warehouse, zone, aisle, rack, product_sku
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FROM md_rack
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WHERE company_id = :company_id
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AND (
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(warehouse = :from_wh AND zone = :from_zone
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AND aisle = :from_aisle AND rack = :from_rack)
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OR
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(warehouse = :to_wh AND zone = :to_zone
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AND aisle = :to_aisle AND rack = :to_rack)
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)
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ORDER BY id
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FOR UPDATE";
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$sth = $this->pdo->prepare($sql);
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$sth->execute([
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":company_id" => $this->company_id,
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":from_wh" => $from_warehouse,
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":from_zone" => $from_zone,
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":from_aisle" => $from_aisle,
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":from_rack" => $from_rack,
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":to_wh" => $to_warehouse,
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":to_zone" => $to_zone,
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":to_aisle" => $to_aisle,
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":to_rack" => $to_rack,
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]);
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$racks = $sth->fetchAll(PDO::FETCH_ASSOC);
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// Identify source and destination from the fetched rows
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$from = null;
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$to = null;
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foreach ($racks as $r) {
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if ($r['warehouse'] == $from_warehouse && $r['zone'] == $from_zone
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&& $r['aisle'] == $from_aisle && $r['rack'] == $from_rack) {
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$from = $r;
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}
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if ($r['warehouse'] == $to_warehouse && $r['zone'] == $to_zone
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&& $r['aisle'] == $to_aisle && $r['rack'] == $to_rack) {
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$to = $r;
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}
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}
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if (!$from) {
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throw new Exception("Source rack not found");
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}
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if (!$to) {
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throw new Exception("Destination rack not found");
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}
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if ($from['product_sku'] === null) {
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throw new Exception("Source rack is empty");
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}
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if ($to['product_sku'] !== null) {
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throw new Exception("Destination rack is already occupied");
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}
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$sku = $from['product_sku'];
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// Clear source
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$sql = "UPDATE md_rack SET product_sku = NULL WHERE id = :id";
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$this->pdo->prepare($sql)->execute([":id" => $from['id']]);
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// Populate destination
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$sql = "UPDATE md_rack SET product_sku = :sku WHERE id = :id";
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$this->pdo->prepare($sql)->execute([
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":sku" => $sku,
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":id" => $to['id'],
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]);
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}
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}
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?>
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