/**
 * 採購單商品表格元件
 */

import { Trash2 } from "lucide-react";
import { Button } from "@/Components/ui/button";
import { Input } from "@/Components/ui/input";
import {
    Select,
    SelectContent,
    SelectItem,
    SelectTrigger,
    SelectValue,
} from "@/Components/ui/select";
import {
    Table,
    TableBody,
    TableCell,
    TableHead,
    TableHeader,
    TableRow,
} from "@/Components/ui/table";
import type { PurchaseOrderItem, Supplier } from "@/types/purchase-order";
import { isPriceAlert, formatCurrency } from "@/utils/purchase-order";

interface PurchaseOrderItemsTableProps {
    items: PurchaseOrderItem[];
    supplier?: Supplier;
    isReadOnly?: boolean;
    isDisabled?: boolean;
    onAddItem?: () => void;
    onRemoveItem?: (index: number) => void;
    onItemChange?: (index: number, field: keyof PurchaseOrderItem, value: string | number) => void;
}

export function PurchaseOrderItemsTable({
    items,
    supplier,
    isReadOnly = false,
    isDisabled = false,
    onRemoveItem,
    onItemChange,
}: PurchaseOrderItemsTableProps) {
    return (
        <div className={`border rounded-lg overflow-hidden ${isDisabled ? "opacity-50 pointer-events-none grayscale" : ""}`}>
            <Table>
                <TableHeader>
                    <TableRow className="bg-gray-50 hover:bg-gray-50">
                        <TableHead className="w-[25%] text-left">商品名稱</TableHead>
                        <TableHead className="w-[10%] text-left">數量</TableHead>
                        <TableHead className="w-[10%] text-left">採購單位</TableHead>
                        <TableHead className="w-[15%] text-left">換算基本單位</TableHead>
                        <TableHead className="w-[15%] text-left">預估單價</TableHead>
                        <TableHead className="w-[15%] text-left">小計</TableHead>
                        {!isReadOnly && <TableHead className="w-[5%]"></TableHead>}
                    </TableRow>
                </TableHeader>
                <TableBody>
                    {items.length === 0 ? (
                        <TableRow>
                            <TableCell
                                colSpan={isReadOnly ? 6 : 7}
                                className="text-center text-gray-400 py-12 italic"
                            >
                                {isDisabled ? "請先選擇供應商後才能新增商品" : "尚未新增任何商品項"}
                            </TableCell>
                        </TableRow>
                    ) : (
                        items.map((item, index) => (
                            <TableRow key={index}>
                                {/* 商品選擇 */}
                                <TableCell>
                                    {isReadOnly ? (
                                        <span className="font-medium">{item.productName}</span>
                                    ) : (
                                        <Select
                                            value={item.productId}
                                            onValueChange={(value) =>
                                                onItemChange?.(index, "productId", value)
                                            }
                                            disabled={isDisabled}
                                        >
                                            <SelectTrigger className="h-10 border-gray-200">
                                                <SelectValue placeholder="選擇商品" />
                                            </SelectTrigger>
                                            <SelectContent>
                                                {supplier?.commonProducts.map((product) => (
                                                    <SelectItem key={product.productId} value={product.productId}>
                                                        {product.productName}
                                                    </SelectItem>
                                                ))}
                                                {(!supplier || supplier.commonProducts.length === 0) && (
                                                    <div className="p-2 text-sm text-gray-400 text-center">無可用商品</div>
                                                )}
                                            </SelectContent>
                                        </Select>
                                    )}
                                </TableCell>

                                {/* 數量 */}
                                <TableCell className="text-left">
                                    {isReadOnly ? (
                                        <span>{Math.floor(item.quantity)}</span>
                                    ) : (
                                        <Input
                                            type="number"
                                            min="0"
                                            step="1"
                                            value={item.quantity === 0 ? "" : Math.floor(item.quantity)}
                                            onChange={(e) =>
                                                onItemChange?.(index, "quantity", Math.floor(Number(e.target.value)))
                                            }
                                            disabled={isDisabled}
                                            className="h-10 text-left border-gray-200 w-24"
                                        />
                                    )}
                                </TableCell>

                                {/* 採購單位 */}
                                <TableCell>
                                    <span className="text-gray-500 font-medium">{item.unit || "-"}</span>
                                </TableCell>

                                {/* 換算基本單位 */}
                                <TableCell>
                                    <span className="text-gray-500 font-medium">
                                        {item.conversion_rate && item.base_unit
                                            ? `${parseFloat((item.quantity * item.conversion_rate).toFixed(2))} ${item.base_unit}`
                                            : "-"}
                                    </span>
                                </TableCell>

                                {/* 單價 */}
                                <TableCell className="text-left">
                                    {isReadOnly ? (
                                        <span className="font-medium text-gray-900">{formatCurrency(item.unitPrice)}</span>
                                    ) : (
                                        <div className="space-y-1">
                                            <Input
                                                type="number"
                                                min="0"
                                                step="0.1"
                                                value={item.unitPrice || ""}
                                                onChange={(e) =>
                                                    onItemChange?.(index, "unitPrice", Number(e.target.value))
                                                }
                                                disabled={isDisabled}
                                                className={`h-10 text-left w-32 ${
                                                    // 如果有數量但沒有單價,顯示錯誤樣式
                                                    item.quantity > 0 && (!item.unitPrice || item.unitPrice <= 0)
                                                        ? "border-red-400 bg-red-50 focus-visible:ring-red-500"
                                                        : isPriceAlert(item.unitPrice, item.previousPrice)
                                                            ? "border-amber-400 bg-amber-50 focus-visible:ring-amber-500"
                                                            : "border-gray-200"
                                                    }`}
                                            />
                                            {/* 錯誤提示:有數量但沒有單價 */}
                                            {item.quantity > 0 && (!item.unitPrice || item.unitPrice <= 0) && (
                                                <p className="text-[10px] text-red-600 font-medium">
                                                    ❌ 請填寫預估單價
                                                </p>
                                            )}
                                            {/* 價格警示:單價高於上次 */}
                                            {item.unitPrice > 0 && isPriceAlert(item.unitPrice, item.previousPrice) && (
                                                <p className="text-[10px] text-amber-600 font-medium animate-pulse">
                                                    ⚠️ 高於上次: {formatCurrency(item.previousPrice || 0)}
                                                </p>
                                            )}
                                        </div>
                                    )}
                                </TableCell>

                                {/* 小計 */}
                                <TableCell className="text-left">
                                    <span className="font-bold text-primary">{formatCurrency(item.subtotal)}</span>
                                </TableCell>

                                {/* 刪除按鈕 */}
                                {!isReadOnly && onRemoveItem && (
                                    <TableCell className="text-center">
                                        <Button
                                            variant="ghost"
                                            size="icon"
                                            onClick={() => onRemoveItem(index)}
                                            className="h-8 w-8 text-gray-300 hover:text-red-500 hover:bg-red-50 transition-colors"
                                        >
                                            <Trash2 className="h-4 w-4" />
                                        </Button>
                                    </TableCell>
                                )}
                            </TableRow>
                        ))
                    )}
                </TableBody>
            </Table>
        </div>
    );
}