<?php
namespace App\Controllers\PSI;

use App\Controllers\Controller;
use App\Models\PSI\Material;
use App\Models\PSI\Product;
use App\Models\PSI\Purchase;
use App\Models\PSI\Sales;
use App\Models\PSI\StockMove;

/** PSI 进销存入口与子路由。权限：super_admin 或 psi_role ∈ {admin,user} */
class DashboardController extends Controller
{
    public function nav(string $seg): array
    {
        return \psi_nav();
    }

    public function dispatch(array $s)
    {
        $res = $s[0] ?? 'dashboard';
        $action = $s[1] ?? '';
        $id = $s[2] ?? null;

        // 仪表盘始终可进
        if ($res === 'dashboard') {
            return $this->dashboard();
        }

        // 用户管理（仅该系统管理员）：统一管理本系统用户及其页面权限
        if ($res === 'users') {
            if (!\subsys_admin('psi')) {
                \Core\App::forbidden('需要 PSI 管理员权限');
                return;
            }
            $uc = new \App\Controllers\PSI\UsersController();
            if ($action === '' || $action === 'index') return $uc->index();
            if ($action === 'create')  return $uc->create();
            if ($action === 'store')   return $uc->store();
            if ($action === 'edit')    return $uc->edit($id);
            if ($action === 'update')  return $uc->update($id);
            if ($action === 'destroy') return $uc->destroy($id);
            if ($action === 'reset')   return $uc->reset($id);
            \Core\App::notFound('未知操作: ' . $action);
            return;
        }

        // 订单管理：合并原「后台订单」到 PSI，方便管理人员在同一系统内快速处理
        if ($res === 'orders') {
            if (!\subsys_page_can('psi', 'orders')) {
                \Core\App::forbidden('您没有访问订单管理的权限');
                return;
            }
            $oc = new \App\Controllers\PSI\OrdersController();
            if ($action === '' || $action === 'index')    return $oc->index();
            if ($action === 'show')      return $oc->show($id);
            if ($action === 'markPaid')  return $oc->markPaid($id);
            if ($action === 'destroy')   return $oc->destroy($id);
            \Core\App::notFound('未知操作: ' . $action);
            return;
        }

        // 销售订单：录入 / 打印 / 关联出库
        if ($res === 'sales_orders') {
            if (!\subsys_page_can('psi', 'sales_orders')) { \Core\App::forbidden('您没有访问销售订单的权限'); return; }
            $c = new \App\Controllers\PSI\SalesOrdersController();
            if ($action === '' || $action === 'index') return $c->index();
            if ($action === 'create')  return $c->create();
            if ($action === 'store')   return $c->store();
            if ($action === 'show')    return $c->show($id);
            if ($action === 'edit')    return $c->edit($id);
            if ($action === 'update')  return $c->update($id);
            if ($action === 'destroy') return $c->destroy($id);
            if ($action === 'print')   return $c->printDoc($id);
            \Core\App::notFound('未知操作: ' . $action); return;
        }

        // 采购订单：录入 / 打印 / 收货入库
        if ($res === 'purchase_orders') {
            if (!\subsys_page_can('psi', 'purchase_orders')) { \Core\App::forbidden('您没有访问采购订单的权限'); return; }
            $c = new \App\Controllers\PSI\PurchaseOrdersController();
            if ($action === '' || $action === 'index') return $c->index();
            if ($action === 'create')  return $c->create();
            if ($action === 'store')   return $c->store();
            if ($action === 'show')    return $c->show($id);
            if ($action === 'edit')    return $c->edit($id);
            if ($action === 'update')  return $c->update($id);
            if ($action === 'destroy') return $c->destroy($id);
            if ($action === 'receive') return $c->receive($id);
            if ($action === 'print')   return $c->printDoc($id);
            \Core\App::notFound('未知操作: ' . $action); return;
        }

        // 出库单：录入 / 打印（关联销售订单、扣减库存）
        if ($res === 'outbounds') {
            if (!\subsys_page_can('psi', 'outbounds')) { \Core\App::forbidden('您没有访问出库单的权限'); return; }
            $c = new \App\Controllers\PSI\OutboundsController();
            if ($action === '' || $action === 'index') return $c->index();
            if ($action === 'create')  return $c->create();
            if ($action === 'store')   return $c->store();
            if ($action === 'show')    return $c->show($id);
            if ($action === 'edit')    return $c->edit($id);
            if ($action === 'update')  return $c->update($id);
            if ($action === 'destroy') return $c->destroy($id);
            if ($action === 'print')   return $c->printDoc($id);
            \Core\App::notFound('未知操作: ' . $action); return;
        }

        // 报表中心：采购订单明细 / 销售·采购订单明细 / 交付明细
        if ($res === 'reports') {
            if (!\subsys_page_can('psi', 'reports')) { \Core\App::forbidden('您没有访问报表中心的权限'); return; }
            $c = new \App\Controllers\PSI\ReportsController();
            if ($action === '' || $action === 'index') return $c->index();
            if ($action === 'poDetail') return $c->poDetail();
            if ($action === 'soPo')     return $c->soPo();
            if ($action === 'delivery') return $c->delivery();
            \Core\App::notFound('未知操作: ' . $action); return;
        }

        // 紧急提醒中心（所有 PSI 用户可见）
        if ($res === 'reminders') {
            $c = new \App\Controllers\PSI\RemindersController();
            return $c->handle(array_slice($s, 1));
        }

        // 通知设置（仅 PSI 管理员，控制器内二次鉴权）
        if ($res === 'notifications') {
            $c = new \App\Controllers\PSI\NotificationsController();
            return $c->handle(array_slice($s, 1));
        }

        // 销售出库（支持 show/print 查看与打印预览）
        if ($res === 'sales') {
            if (!\subsys_page_can('psi', 'sales')) { \Core\App::forbidden('您没有访问销售出库的权限'); return; }
            $c = new \App\Controllers\PSI\SalesController();
            if ($action === '' || $action === 'index') return $c->index();
            if ($action === 'create')  return $c->create();
            if ($action === 'store')   return $c->store();
            if ($action === 'show')    return $c->show($id);
            if ($action === 'destroy') return $c->destroy($id);
            if ($action === 'print')   return $c->printDoc($id);
            \Core\App::notFound('未知操作: ' . $action); return;
        }

        $map = [
            'materials'  => 'MaterialsController',
            'products'   => 'ProductsController',
            'suppliers'  => 'SuppliersController',
            'purchases'  => 'PurchasesController',
            'stock'      => 'StockController',
        ];
        if (!isset($map[$res])) {
            \Core\App::notFound('未知页面: ' . $res);
            return;
        }
        // 页面级权限：按分系统「页面可见权限」拦截
        if (!\subsys_page_can('psi', $res)) {
            \Core\App::forbidden('您没有访问该页面的权限');
            return;
        }
        // 资源子操作路由：/PSI/{resource}[/{action}[/{id}]]
        // 支持 index/create/store/edit/update/destroy/adjust
        $method = $this->resolveSubsysAction($action);
        if ($method === null) {
            \Core\App::notFound('未知操作: ' . $action);
            return;
        }
        $class = 'App\\Controllers\\PSI\\' . $map[$res];
        $instance = new $class();
        if (!method_exists($instance, $method)) {
            \Core\App::notFound('操作不存在: ' . $method);
            return;
        }
        return $instance->$method($id);
    }

    /** 将 URL 动作段解析为控制器方法名；不支持的动作返回 null */
    private function resolveSubsysAction(string $action): ?string
    {
        $verbs = [
            ''        => 'index',
            'index'   => 'index',
            'create'  => 'create',
            'store'   => 'store',
            'edit'    => 'edit',
            'update'  => 'update',
            'destroy' => 'destroy',
            'adjust'  => 'adjust',
        ];
        return $verbs[$action] ?? null;
    }

    public function dashboard()
    {
        $materials = (new Material())->all();
        $products  = (new Product())->all();
        $purchases = (new Purchase())->all();
        $sales     = (new Sales())->all();

        $matStock = array_sum(array_map(fn($m) => (float)($m['stock'] ?? 0), $materials));
        $prodStock = array_sum(array_map(fn($p) => (float)($p['stock'] ?? 0), $products));
        $purchaseAmt = array_sum(array_map(fn($p) => (float)($p['amount'] ?? 0), $purchases));
        $salesAmt = array_sum(array_map(fn($s) => (float)($s['amount'] ?? 0), $sales));
        $lowStock = [];
        foreach ($materials as $m) { if ((float)($m['stock'] ?? 0) < 20) $lowStock[] = ['type' => '物料', 'item' => $m]; }
        foreach ($products as $p) { if ((float)($p['stock'] ?? 0) < 20) $lowStock[] = ['type' => '成品', 'item' => $p]; }

        $recentPurchases = array_slice(array_reverse($purchases), 0, 5);
        $recentSales     = array_slice(array_reverse($sales), 0, 5);

        // 订单/出库业务指标（表未创建时静默降级）
        $bySalesman = [];
        $salesAmount = 0; $salesAmountMonth = 0;
        $undelivered = ['count' => 0, 'amount' => 0];
        $monthDeliveries = ['count' => 0, 'amount' => 0];
        try {
            $bySalesman = \Core\Db::query(
                "SELECT o.salesman AS salesman, COUNT(DISTINCT o.id) AS orders,
                        COALESCE(SUM(i.amount),0) AS amount
                 FROM psi_sales_orders o
                 LEFT JOIN psi_sales_order_items i ON i.so_id=o.id
                 WHERE o.salesman <> '' AND o.status <> 'closed'
                 GROUP BY o.salesman ORDER BY amount DESC"
            )->fetchAll();

            $r = \Core\Db::query(
                "SELECT COALESCE(SUM(i.amount),0) AS amt,
                        COALESCE(SUM(CASE WHEN MONTH(o.created_at)=MONTH(CURDATE()) AND YEAR(o.created_at)=YEAR(CURDATE()) THEN i.amount ELSE 0 END),0) AS amt_m
                 FROM psi_sales_orders o LEFT JOIN psi_sales_order_items i ON i.so_id=o.id
                 WHERE o.status <> 'closed'"
            )->fetch();
            $salesAmount = (float)($r['amt'] ?? 0);
            $salesAmountMonth = (float)($r['amt_m'] ?? 0);

            $u = \Core\Db::query(
                "SELECT COUNT(*) AS c, COALESCE(SUM(i.amount),0) AS amt
                 FROM psi_sales_orders o LEFT JOIN psi_sales_order_items i ON i.so_id=o.id
                 WHERE o.status IN ('pending','partial')"
            )->fetch();
            $undelivered = ['count' => (int)($u['c'] ?? 0), 'amount' => (float)($u['amt'] ?? 0)];

            $d = \Core\Db::query(
                "SELECT COUNT(*) AS c, COALESCE(SUM(i.amount),0) AS amt
                 FROM psi_outbounds ob LEFT JOIN psi_outbound_items i ON i.ob_id=ob.id
                 WHERE MONTH(ob.created_at)=MONTH(CURDATE()) AND YEAR(ob.created_at)=YEAR(CURDATE())"
            )->fetch();
            $monthDeliveries = ['count' => (int)($d['c'] ?? 0), 'amount' => (float)($d['amt'] ?? 0)];
        } catch (\Throwable $e) { /* 表未创建时不报错 */ }

        return $this->renderSubsys('psi', 'psi/dashboard', [
            'materialTotal' => count($materials),
            'productTotal'  => count($products),
            'matStock'      => $matStock,
            'prodStock'     => $prodStock,
            'purchaseAmt'   => $purchaseAmt,
            'salesAmt'      => $salesAmt,
            'lowStock'      => $lowStock,
            'recentPurchases' => $recentPurchases,
            'recentSales'     => $recentSales,
            'bySalesman'      => $bySalesman,
            'salesAmount'     => $salesAmount,
            'salesAmountMonth' => $salesAmountMonth,
            'undelivered'     => $undelivered,
            'monthDeliveries' => $monthDeliveries,
        ], $this->nav('dashboard'), 'dashboard');
    }
}