/**
 * 新增供貨商品對話框
 */

import { useState, useMemo } from "react";
import { Button } from "@/Components/ui/button";
import { Input } from "@/Components/ui/input";
import { Label } from "@/Components/ui/label";
import {
    Dialog,
    DialogContent,
    DialogHeader,
    DialogTitle,
    DialogDescription,
    DialogFooter,
} from "@/Components/ui/dialog";
import {
    Command,
    CommandEmpty,
    CommandGroup,
    CommandInput,
    CommandItem,
    CommandList,
} from "@/Components/ui/command";
import {
    Popover,
    PopoverContent,
    PopoverTrigger,
} from "@/Components/ui/popover";
import { Check, ChevronsUpDown } from "lucide-react";
import { cn } from "@/lib/utils";
import type { Product } from "@/types/product";
import type { SupplyProduct } from "@/types/vendor";

interface AddSupplyProductDialogProps {
    open: boolean;
    products: Product[];
    existingSupplyProducts: SupplyProduct[];
    onClose: () => void;
    onAdd: (productId: string, lastPrice?: number) => void;
}

export default function AddSupplyProductDialog({
    open,
    products,
    existingSupplyProducts,
    onClose,
    onAdd,
}: AddSupplyProductDialogProps) {
    const [selectedProductId, setSelectedProductId] = useState<string>("");
    const [lastPrice, setLastPrice] = useState<string>("");
    const [openCombobox, setOpenCombobox] = useState(false);

    // 過濾掉已經在供貨列表中的商品
    const availableProducts = useMemo(() => {
        const existingIds = new Set(existingSupplyProducts.map(sp => sp.productId));
        return products.filter(p => !existingIds.has(p.id));
    }, [products, existingSupplyProducts]);

    const selectedProduct = availableProducts.find(p => p.id === selectedProductId);

    const handleAdd = () => {
        if (!selectedProductId) return;

        const price = lastPrice ? parseFloat(lastPrice) : undefined;
        onAdd(selectedProductId, price);

        // 重置表單
        setSelectedProductId("");
        setLastPrice("");
    };

    const handleCancel = () => {
        setSelectedProductId("");
        setLastPrice("");
        onClose();
    };

    return (
        <Dialog open={open} onOpenChange={onClose}>
            <DialogContent className="max-w-xl">
                <DialogHeader>
                    <DialogTitle>新增供貨商品</DialogTitle>
                    <DialogDescription>選擇該廠商可供應的商品並設定採購價格。</DialogDescription>
                </DialogHeader>

                <div className="space-y-4">
                    {/* 商品選擇 */}
                    <div className="flex flex-col gap-2">
                        <Label className="text-sm font-medium">商品名稱</Label>
                        <Popover open={openCombobox} onOpenChange={setOpenCombobox}>
                            <PopoverTrigger asChild>
                                <button
                                    type="button"
                                    role="combobox"
                                    aria-expanded={openCombobox}
                                    className="flex h-9 w-full items-center justify-between rounded-md border-2 border-grey-3 !bg-grey-5 px-3 py-1 text-sm font-normal text-grey-0 text-left outline-none transition-colors hover:!bg-grey-5 hover:border-primary/50 focus-visible:border-[var(--primary-main)] focus-visible:ring-[3px] focus-visible:ring-[var(--primary-main)]/20"
                                    onClick={() => setOpenCombobox(!openCombobox)}
                                >
                                    {selectedProduct ? (
                                        <span className="font-medium text-gray-900">{selectedProduct.name}</span>
                                    ) : (
                                        <span className="text-gray-400">請選擇商品...</span>
                                    )}
                                    <ChevronsUpDown className="ml-2 h-4 w-4 shrink-0 opacity-50" />
                                </button>
                            </PopoverTrigger>
                            <PopoverContent className="w-[450px] p-0 shadow-lg border-2" align="start">
                                <Command>
                                    <CommandInput placeholder="搜尋商品名稱..." />
                                    <CommandList className="max-h-[300px]">
                                        <CommandEmpty className="py-6 text-center text-sm text-gray-500">
                                            找不到符合的商品
                                        </CommandEmpty>
                                        <CommandGroup>
                                            {availableProducts.map((product) => (
                                                <CommandItem
                                                    key={product.id}
                                                    value={product.name}
                                                    onSelect={() => {
                                                        setSelectedProductId(product.id);
                                                        setOpenCombobox(false);
                                                    }}
                                                    className="cursor-pointer aria-selected:bg-primary/5 aria-selected:text-primary py-3"
                                                >
                                                    <Check
                                                        className={cn(
                                                            "mr-2 h-4 w-4 text-primary",
                                                            selectedProductId === product.id ? "opacity-100" : "opacity-0"
                                                        )}
                                                    />
                                                    <div className="flex items-center justify-between flex-1">
                                                        <span className="font-medium">{product.name}</span>
                                                        <span className="text-xs text-gray-400 bg-gray-50 px-2 py-1 rounded">
                                                            {product.purchase_unit || product.base_unit || "個"}
                                                        </span>
                                                    </div>
                                                </CommandItem>
                                            ))}
                                        </CommandGroup>
                                    </CommandList>
                                </Command>
                            </PopoverContent>
                        </Popover>
                    </div>

                    {/* 單位（自動帶入） */}
                    <div className="flex flex-col gap-2">
                        <Label className="text-sm font-medium text-gray-500">採購單位</Label>
                        <div className="h-10 px-3 py-2 bg-gray-50 border border-gray-200 rounded-md text-gray-600 font-medium text-sm flex items-center">
                            {selectedProduct ? (selectedProduct.purchase_unit || selectedProduct.base_unit || "個") : "-"}
                        </div>
                    </div>

                    {/* 上次採購價格 */}
                    <div>
                        <Label className="text-muted-foreground text-xs">上次採購單價（選填）</Label>
                        <Input
                            type="number"
                            placeholder="輸入價格"
                            value={lastPrice}
                            onChange={(e) => setLastPrice(e.target.value)}
                            className="mt-1"
                        />
                    </div>
                </div>

                <DialogFooter>
                    <Button
                        variant="outline"
                        size="sm"
                        onClick={handleCancel}
                        className="gap-2 button-outlined-primary"
                    >
                        取消
                    </Button>
                    <Button
                        size="sm"
                        onClick={handleAdd}
                        disabled={!selectedProductId}
                        className="gap-2 button-filled-primary"
                    >
                        新增
                    </Button>
                </DialogFooter>
            </DialogContent>
        </Dialog>
    );
}
