<?php

namespace App\Exports;

use App\Exceptions\RepositoryException;
use App\Models\PurchaseOrderModel;
use App\Models\StoreOrderItemModel;
use App\Models\SupplierModel;
use Maatwebsite\Excel\Concerns\WithMultipleSheets;

/**
 * 供应商采购明细导出：多供应商合并为一个 XLSX（每供应商一个工作表，工作表名=供应商名称）；
 * 构造传入 supplierId 时仅导出该供应商（单工作表）
 */
class PurchaseSupplierExport implements WithMultipleSheets
{
    /**
     * @param PurchaseOrderModel $purchase 采购单
     * @param int $supplierId 单供应商导出（0=全部供应商）
     */
    public function __construct(
        private readonly PurchaseOrderModel $purchase,
        private readonly int $supplierId = 0,
    ) {
    }

    /**
     * @return array<int, PurchaseSupplierSheet>
     */
    public function sheets(): array
    {
        // 本采购单内有明细的供应商（按订货明细快照 supplier_id 归集）
        $query = StoreOrderItemModel::query()
            ->join('store_order', 'store_order.id', '=', 'store_order_item.order_id')
            ->where('store_order_item.purchase_id', $this->purchase->id)
            ->whereNull('store_order.deleted_at')
            ->where('store_order_item.supplier_id', '>', 0);
        if ($this->supplierId > 0) {
            $query->where('store_order_item.supplier_id', $this->supplierId);
        }
        $supplierIds = $query->distinct()->pluck('store_order_item.supplier_id');

        if ($supplierIds->isEmpty()) {
            throw new RepositoryException(
                $this->supplierId > 0 ? '该供应商在此采购单中无采购明细' : '该采购单无供应商采购明细，无法导出'
            );
        }

        $suppliers = SupplierModel::withTrashed()
            ->whereIn('id', $supplierIds)
            ->orderBy('id')
            ->get(['id', 'name']);

        $usedNames = [];
        $sheets = [];
        foreach ($suppliers as $supplier) {
            $sheets[] = new PurchaseSupplierSheet(
                $this->purchase,
                $supplier,
                SheetName::make((string) $supplier->name, (int) $supplier->id, $usedNames),
            );
        }

        return $sheets;
    }
}