/**
 * 安全庫存列表組件
 */

import { Trash2, Pencil } from "lucide-react";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/Components/ui/table";
import { Button } from "@/Components/ui/button";
import { SafetyStockSetting, WarehouseInventory, SafetyStockStatus } from "@/types/warehouse";
import { StatusBadge } from "@/Components/shared/StatusBadge";

interface SafetyStockListProps {
  settings: SafetyStockSetting[];
  inventories: WarehouseInventory[];
  onEdit: (setting: SafetyStockSetting) => void;
  onDelete: (id: string) => void;
}

// 計算安全庫存狀態
function getSafetyStockStatus(
  currentStock: number,
  safetyStock: number
): SafetyStockStatus {
  const ratio = currentStock / safetyStock;
  if (ratio >= 1.2) return "正常";
  if (ratio >= 1.0) return "接近";
  return "低於";
}

// 獲取狀態徽章
function getStatusBadge(status: SafetyStockStatus) {
  if (status === '正常') {
    return (
      <StatusBadge variant="success">
        正常
      </StatusBadge>
    );
  }
  if (status === '接近') {
    return (
      <StatusBadge variant="warning">
        接近
      </StatusBadge>
    );
  }
  if (status === '低於') {
    return (
      <StatusBadge variant="destructive">
        低於
      </StatusBadge>
    );
  }
  return null; // Should not happen if SafetyStockStatus is exhaustive
}

export default function SafetyStockList({
  settings,
  inventories,
  onEdit,
  onDelete,
}: SafetyStockListProps) {
  if (settings.length === 0) {
    return (
      <div className="bg-white rounded-lg shadow-sm border p-12 text-center text-gray-400">
        <p>尚未設定任何安全庫存</p>
        <p className="text-sm mt-1">點擊「新增安全庫存」開始設定</p>
      </div>
    );
  }

  // 計算每個商品的目前總庫存
  const getCurrentStock = (productId: string): number => {
    return inventories
      .filter((inv) => inv.productId === productId)
      .reduce((sum, inv) => sum + inv.quantity, 0);
  };

  return (
    <div className="bg-white rounded-lg shadow-sm border overflow-hidden">
      <div className="overflow-x-auto">
        <Table>
          <TableHeader>
            <TableRow>
              <TableHead className="w-[5%]">#</TableHead>
              <TableHead className="w-[25%]">商品名稱</TableHead>
              <TableHead className="w-[12%]">商品類型</TableHead>
              <TableHead className="w-[12%]">目前庫存</TableHead>
              <TableHead className="w-[12%]">安全庫存</TableHead>
              <TableHead className="w-[15%]">狀態</TableHead>
              <TableHead className="w-[12%] text-right">操作</TableHead>
            </TableRow>
          </TableHeader>
          <TableBody>
            {settings.map((setting, index) => {
              const currentStock = getCurrentStock(setting.productId);
              const status = getSafetyStockStatus(currentStock, setting.safetyStock);
              const isLowStock = status === "低於";

              return (
                <TableRow key={setting.id} className={isLowStock ? "bg-red-50" : ""}>
                  <TableCell className="text-grey-2">{index + 1}</TableCell>
                  <TableCell className="font-medium">{setting.productName}</TableCell>
                  <TableCell>
                    <StatusBadge variant="neutral">{setting.productType}</StatusBadge>
                  </TableCell>
                  <TableCell>
                    <span className={isLowStock ? "text-red-600 font-medium" : ""}>
                      {currentStock}
                    </span>
                  </TableCell>
                  <TableCell>{setting.safetyStock}</TableCell>
                  <TableCell>{getStatusBadge(status)}</TableCell>
                  <TableCell className="text-right">
                    <div className="flex items-center justify-end gap-2">
                      <Button
                        type="button"
                        variant="ghost"
                        size="sm"
                        onClick={() => onEdit(setting)}
                        className="hover:bg-primary/10 hover:text-primary"
                      >
                        <Pencil className="h-4 w-4 mr-1" />
                        編輯
                      </Button>
                      <Button
                        type="button"
                        variant="ghost"
                        size="sm"
                        onClick={() => onDelete(setting.id)}
                        className="hover:bg-red-50 hover:text-red-600"
                      >
                        <Trash2 className="h-4 w-4 mr-1" />
                        移除
                      </Button>
                    </div>
                  </TableCell>
                </TableRow>
              );
            })}
          </TableBody>
        </Table>
      </div>
    </div>
  );
}