<?php
namespace App\Controllers\PSI;

use App\Controllers\Controller;
use App\Models\PSI\PurchaseOrder;
use App\Models\PSI\PurchaseOrderItem;
use App\Models\PSI\Material;
use App\Models\PSI\Product;
use App\Models\PSI\Purchase;
use App\Controllers\PSI\StockHelper;

/**
 * 采购订单：录入（可打印）、收货入库（写 psi_purchases 并增加成品库存）。
 * 供应商从 psi_suppliers 选择；明细可为物料或成品。
 */
class PurchaseOrdersController extends Controller
{
    public function index()
    {
        $orders = array_reverse((new PurchaseOrder())->all());
        $itemM = new PurchaseOrderItem();
        foreach ($orders as &$o) { $o['_items'] = $itemM->whereAll('po_id', $o['id']); }
        return $this->renderSubsys('psi', 'psi/purchase_orders', ['orders' => $orders], \psi_nav(), 'purchase_orders');
    }

    public function create()
    {
        return $this->renderSubsys('psi', 'psi/purchase_order_form', [
            'o' => null, 'items' => [], 'materials' => (new Material())->all(), 'products' => (new Product())->all(),
        ], \psi_nav(), 'purchase_orders');
    }

    public function store()
    {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST' || !csrf_check()) return $this->redirect('PSI/purchase_orders/create');
        $items = $this->parseItems();
        if (empty($items)) { $this->flash('请至少添加一条采购明细', 'err'); return $this->redirect('PSI/purchase_orders/create'); }
        $id = (new PurchaseOrder())->insert([
            'order_no'      => $oNo  = \psi_gen_no('PO'),
            'supplier_id'   => (int)$this->post('supplier_id'),
            'supplier_name' => $supp = trim($this->post('supplier_name')),
            'salesman'      => $buyer = trim($this->post('salesman')) ?: ($_SESSION['admin_name'] ?? ''),
            'status'        => 'pending',
            'expected_at'   => $this->post('expected_at') ?: null,
            'remark'        => trim($this->post('remark')),
            'created_at'    => date('Y-m-d H:i:s'),
        ]);
        $itemM = new PurchaseOrderItem();
        foreach ($items as $it) { $it['po_id'] = $id; $itemM->insert($it); }
        \Core\Notify::newPurchaseOrder($oNo, $supp, $buyer, $id);
        $this->flash('采购订单已创建', 'ok');
        if ($this->post('auto_print', '1') !== '0') {
            return $this->redirect('PSI/purchase_orders/print/' . $id);
        }
        return $this->redirect('PSI/purchase_orders/show/' . $id);
    }

    public function show($id)
    {
        $o = (new PurchaseOrder())->find($id);
        if (!$o) { \Core\App::notFound(); return; }
        $items = (new PurchaseOrderItem())->whereAll('po_id', $id);
        return $this->renderSubsys('psi', 'psi/purchase_order_show', ['o' => $o, 'items' => $items], \psi_nav(), 'purchase_orders');
    }

    public function edit($id)
    {
        $o = (new PurchaseOrder())->find($id);
        if (!$o) { \Core\App::notFound(); return; }
        if (in_array($o['status'], ['received'], true)) { $this->flash('已收货的采购订单不可编辑', 'err'); return $this->redirect('PSI/purchase_orders/show/' . $id); }
        $items = (new PurchaseOrderItem())->whereAll('po_id', $id);
        return $this->renderSubsys('psi', 'psi/purchase_order_form', [
            'o' => $o, 'items' => $items, 'materials' => (new Material())->all(), 'products' => (new Product())->all(),
        ], \psi_nav(), 'purchase_orders');
    }

    public function update($id)
    {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST' || !csrf_check()) return $this->redirect('PSI/purchase_orders/edit/' . $id);
        $o = (new PurchaseOrder())->find($id);
        if (!$o) { \Core\App::notFound(); return; }
        $items = $this->parseItems();
        if (empty($items)) { $this->flash('请至少添加一条采购明细', 'err'); return $this->redirect('PSI/purchase_orders/edit/' . $id); }

        (new PurchaseOrder())->update($id, [
            'supplier_id'   => (int)$this->post('supplier_id'),
            'supplier_name' => trim($this->post('supplier_name')),
            'salesman'      => trim($this->post('salesman')) ?: ($_SESSION['admin_name'] ?? ''),
            'expected_at'   => $this->post('expected_at') ?: null,
            'remark'        => trim($this->post('remark')),
        ]);
        $old = (new PurchaseOrderItem())->whereAll('po_id', $id);
        $recv = [];
        foreach ($old as $oi) { $recv[($oi['item_type'] ?? '') . '|' . ($oi['item_id'] ?? 0) . '|' . $oi['name']] = (int)($oi['received_qty'] ?? 0); }
        (new PurchaseOrderItem())->deleteRaw('po_id', $id);
        foreach ($items as $it) {
            $key = ($it['item_type'] ?? '') . '|' . ($it['item_id'] ?? 0) . '|' . $it['name'];
            $it['received_qty'] = $recv[$key] ?? 0;
            $it['po_id'] = $id;
            (new PurchaseOrderItem())->insert($it);
        }
        $this->flash('采购订单已更新', 'ok');
        return $this->redirect('PSI/purchase_orders/show/' . $id);
    }

    /** 收货入库：成品增加库存 + 写入采购入库流水；更新已收数量与状态 */
    public function receive($id)
    {
        if ($_SERVER['REQUEST_METHOD'] !== 'POST' || !csrf_check()) return $this->redirect('PSI/purchase_orders/show/' . $id);
        $o = (new PurchaseOrder())->find($id);
        if (!$o) { \Core\App::notFound(); return; }
        if ($o['status'] === 'received') { $this->flash('该采购订单已收货，不可重复操作', 'err'); return $this->redirect('PSI/purchase_orders/show/' . $id); }

        $items = (new PurchaseOrderItem())->whereAll('po_id', $id);
        $purchaseM = new Purchase();
        foreach ($items as $it) {
            if ((int)$it['qty'] <= 0) continue;
            if ($it['item_type'] === 'product' && (int)$it['item_id'] > 0) {
                StockHelper::adjustStock((int)$it['item_id'], (int)$it['qty'], 'in', '采购入库', $o['order_no']);
                $purchaseM->insert([
                    'product_id' => (int)$it['item_id'], 'qty' => (int)$it['qty'],
                    'price' => (float)$it['price'], 'amount' => (float)$it['amount'],
                    'supplier' => $o['supplier_name'], 'order_no' => $o['order_no'],
                    'created_at' => date('Y-m-d H:i:s'),
                ]);
            }
            (new PurchaseOrderItem())->update($it['id'], ['received_qty' => (int)$it['qty']]);
        }
        (new PurchaseOrder())->update($id, ['status' => 'received']);
        $this->flash('采购订单已收货入库', 'ok');
        return $this->redirect('PSI/purchase_orders/show/' . $id);
    }

    public function destroy($id)
    {
        if ($_SERVER['REQUEST_METHOD'] === 'POST' && csrf_check()) {
            (new PurchaseOrderItem())->deleteRaw('po_id', $id);
            (new PurchaseOrder())->delete($id);
            $this->flash('采购订单已删除', 'ok');
        }
        return $this->redirect('PSI/purchase_orders');
    }

    public function printDoc($id)
    {
        $o = (new PurchaseOrder())->find($id);
        if (!$o) { \Core\App::notFound(); return; }
        $items = (new PurchaseOrderItem())->whereAll('po_id', $id);
        $body = \App\Core\View::render('psi/purchase_order_print', ['o' => $o, 'items' => $items]);
        echo \psi_print_shell('采购订单 ' . $o['order_no'], $body);
    }

    private function parseItems(): array
    {
        $raw = $_POST['items'] ?? [];
        $out = [];
        foreach ($raw as $row) {
            $name = trim((string)($row['name'] ?? ''));
            $qty = (int)($row['qty'] ?? 0);
            $price = (float)($row['price'] ?? 0);
            if ($name === '' || $qty <= 0) continue;
            $out[] = [
                'item_type' => $row['item_type'] === 'product' ? 'product' : 'material',
                'item_id'   => (int)($row['item_id'] ?? 0),
                'name'      => $name,
                'spec'      => trim((string)($row['spec'] ?? '')),
                'unit'      => trim((string)($row['unit'] ?? '')),
                'qty'       => $qty,
                'price'     => $price,
                'amount'    => round($qty * $price, 2),
                'received_qty' => 0,
            ];
        }
        return $out;
    }
}