import { useState, useCallback, useEffect } from "react";
import AuthenticatedLayout from "@/Layouts/AuthenticatedLayout";
import { Head, Link, router } from "@inertiajs/react";
import { debounce } from "lodash";
import { SearchableSelect } from "@/Components/ui/searchable-select";
import {
    Table,
    TableBody,
    TableCell,
    TableHead,
    TableHeader,
    TableRow,
} from "@/Components/ui/table";
import { Button } from "@/Components/ui/button";
import { Input } from "@/Components/ui/input";
import { Badge } from "@/Components/ui/badge";
import {
    Dialog,
    DialogContent,
    DialogHeader,
    DialogTitle,
    DialogTrigger,
    DialogFooter,
    DialogDescription,
} from "@/Components/ui/dialog";
import { Label } from "@/Components/ui/label";
import {
    Plus,
    Search,
    ArrowLeftRight,
    Loader2,
    Eye,
    Pencil,
    Trash2,
    X,
} from "lucide-react";
import {
    AlertDialog,
    AlertDialogAction,
    AlertDialogCancel,
    AlertDialogContent,
    AlertDialogDescription,
    AlertDialogFooter,
    AlertDialogHeader,
    AlertDialogTitle,
} from "@/Components/ui/alert-dialog";
import Pagination from "@/Components/shared/Pagination";
import { toast } from "sonner";
import { Can } from '@/Components/Permission/Can';

export default function Index({ warehouses, orders, filters }: any) {
    const [searchTerm, setSearchTerm] = useState(filters.search || "");
    const [warehouseFilter, setWarehouseFilter] = useState(filters.warehouse_id || "all");
    const [perPage, setPerPage] = useState(filters.per_page || "10");

    // Sync state with props
    useEffect(() => {
        setSearchTerm(filters.search || "");
        setWarehouseFilter(filters.warehouse_id || "all");
        setPerPage(filters.per_page || "10");
    }, [filters]);

    // Create Dialog State
    const [isCreateOpen, setIsCreateOpen] = useState(false);
    const [sourceWarehouseId, setSourceWarehouseId] = useState("");
    const [targetWarehouseId, setTargetWarehouseId] = useState("");
    const [creating, setCreating] = useState(false);
    const [deleteId, setDeleteId] = useState<string | null>(null);

    // Debounced Search Handler
    const debouncedSearch = useCallback(
        debounce((term: string, warehouse: string) => {
            router.get(
                route('inventory.transfer.index'),
                { ...filters, search: term, warehouse_id: warehouse === "all" ? "" : warehouse },
                { preserveState: true, replace: true, preserveScroll: true }
            );
        }, 500),
        [filters]
    );

    const handleSearchChange = (term: string) => {
        setSearchTerm(term);
        debouncedSearch(term, warehouseFilter);
    };

    const handleFilterChange = (value: string) => {
        setWarehouseFilter(value);
        router.get(
            route('inventory.transfer.index'),
            { ...filters, warehouse_id: value === "all" ? "" : value },
            { preserveState: false, replace: true, preserveScroll: true }
        );
    };

    const handleClearSearch = () => {
        setSearchTerm("");
        router.get(
            route('inventory.transfer.index'),
            { ...filters, search: "", warehouse_id: warehouseFilter === "all" ? "" : warehouseFilter },
            { preserveState: true, replace: true, preserveScroll: true }
        );
    };

    const handlePerPageChange = (value: string) => {
        setPerPage(value);
        router.get(
            route('inventory.transfer.index'),
            { ...filters, per_page: value },
            { preserveState: false, replace: true, preserveScroll: true }
        );
    };

    const handleCreate = () => {
        if (!sourceWarehouseId) {
            toast.error("請選擇來源倉庫");
            return;
        }
        if (!targetWarehouseId) {
            toast.error("請選擇目的倉庫");
            return;
        }
        if (sourceWarehouseId === targetWarehouseId) {
            toast.error("來源與目的倉庫不能相同");
            return;
        }
        setCreating(true);
        router.post(route('inventory.transfer.store'), {
            from_warehouse_id: sourceWarehouseId,
            to_warehouse_id: targetWarehouseId
        }, {
            onFinish: () => setCreating(false),
            onSuccess: () => {
                setIsCreateOpen(false);
                setSourceWarehouseId("");
                setTargetWarehouseId("");
            }
        });
    };

    const confirmDelete = (id: string) => {
        setDeleteId(id);
    };

    const handleDelete = () => {
        if (deleteId) {
            router.delete(route('inventory.transfer.destroy', [deleteId]), {
                onSuccess: () => {
                    setDeleteId(null);
                    toast.success("已成功刪除");
                },
                onError: () => setDeleteId(null),
            });
        }
    };

    const getStatusBadge = (status: string) => {
        switch (status) {
            case 'draft':
                return <Badge variant="secondary">草稿</Badge>;
            case 'completed':
                return <Badge className="bg-green-500 hover:bg-green-600">已完成</Badge>;
            case 'voided':
                return <Badge variant="destructive">已作廢</Badge>;
            default:
                return <Badge variant="outline">{status}</Badge>;
        }
    };

    return (
        <AuthenticatedLayout
            breadcrumbs={[
                { label: '商品與庫存與管理', href: '#' },
                { label: '庫存調撥', href: route('inventory.transfer.index'), isPage: true },
            ]}
        >
            <Head title="庫存調撥" />

            <div className="container mx-auto p-6 max-w-7xl">
                <div className="flex items-center justify-between mb-6">
                    <div>
                        <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                            <ArrowLeftRight className="h-6 w-6 text-primary-main" />
                            庫存調撥管理
                        </h1>
                        <p className="text-gray-500 mt-1">
                            建立與管理倉庫間的商品調撥單，追蹤庫存轉移紀錄。
                        </p>
                    </div>
                </div>

                {/* Toolbar */}
                <div className="bg-white rounded-lg shadow-sm border p-4 mb-6">
                    <div className="flex flex-col md:flex-row gap-4">
                        {/* Search */}
                        <div className="flex-1 relative">
                            <Search className="absolute left-3 top-1/2 transform -translate-y-1/2 text-gray-400 h-4 w-4" />
                            <Input
                                placeholder="搜尋調撥單號、備註..."
                                value={searchTerm}
                                onChange={(e) => handleSearchChange(e.target.value)}
                                className="pl-10 pr-10 h-9"
                            />
                            {searchTerm && (
                                <button
                                    onClick={handleClearSearch}
                                    className="absolute right-3 top-1/2 transform -translate-y-1/2 text-gray-400 hover:text-gray-600"
                                >
                                    <X className="h-4 w-4" />
                                </button>
                            )}
                        </div>

                        {/* Warehouse Filter */}
                        <SearchableSelect
                            value={warehouseFilter}
                            onValueChange={handleFilterChange}
                            options={[
                                { label: "所有倉庫", value: "all" },
                                ...warehouses.map((w: any) => ({ label: w.name, value: w.id.toString() }))
                            ]}
                            placeholder="選擇倉庫"
                            className="w-full md:w-[200px] h-9"
                        />

                        {/* Action Buttons */}
                        <div className="flex gap-2 w-full md:w-auto">
                            <Can permission="inventory.view">
                                <Dialog open={isCreateOpen} onOpenChange={setIsCreateOpen}>
                                    <DialogTrigger asChild>
                                        <Button className="flex-1 md:flex-none button-filled-primary">
                                            <Plus className="w-4 h-4 mr-2" />
                                            新增調撥單
                                        </Button>
                                    </DialogTrigger>
                                    <DialogContent className="sm:max-w-[425px]">
                                        <DialogHeader>
                                            <DialogTitle>建立新調撥單</DialogTitle>
                                            <DialogDescription>
                                                請選擇來源倉庫與目的倉庫。
                                            </DialogDescription>
                                        </DialogHeader>
                                        <div className="grid gap-4 py-4">
                                            <div className="space-y-2">
                                                <Label>來源倉庫</Label>
                                                <SearchableSelect
                                                    value={sourceWarehouseId}
                                                    onValueChange={setSourceWarehouseId}
                                                    options={warehouses.map((w: any) => ({ label: w.name, value: w.id.toString() }))}
                                                    placeholder="請選擇來源倉庫"
                                                    className="h-9"
                                                />
                                            </div>
                                            <div className="space-y-2">
                                                <Label>目的倉庫</Label>
                                                <SearchableSelect
                                                    value={targetWarehouseId}
                                                    onValueChange={setTargetWarehouseId}
                                                    options={warehouses.filter((w: any) => w.id.toString() !== sourceWarehouseId).map((w: any) => ({ label: w.name, value: w.id.toString() }))}
                                                    placeholder="請選擇目的倉庫"
                                                    className="h-9"
                                                />
                                            </div>
                                        </div>
                                        <DialogFooter>
                                            <Button type="button" variant="outline" className="button-outlined-primary" onClick={() => setIsCreateOpen(false)}>
                                                取消
                                            </Button>
                                            <Button onClick={handleCreate} className="button-filled-primary" disabled={creating || !sourceWarehouseId || !targetWarehouseId}>
                                                {creating && <Loader2 className="mr-2 h-4 w-4 animate-spin" />}
                                                新增
                                            </Button>
                                        </DialogFooter>
                                    </DialogContent>
                                </Dialog>
                            </Can>
                        </div>
                    </div>
                </div>

                <div className="bg-white rounded-xl border border-gray-200 shadow-sm overflow-hidden">
                    <Table>
                        <TableHeader className="bg-gray-50">
                            <TableRow>
                                <TableHead className="w-[50px] text-center font-medium text-gray-600">#</TableHead>
                                <TableHead className="font-medium text-gray-600">單號</TableHead>
                                <TableHead className="text-center font-medium text-gray-600">狀態</TableHead>
                                <TableHead className="font-medium text-gray-600">來源倉庫</TableHead>
                                <TableHead className="font-medium text-gray-600">目的倉庫</TableHead>
                                <TableHead className="font-medium text-gray-600">建立日期</TableHead>
                                <TableHead className="font-medium text-gray-600">過帳日期</TableHead>
                                <TableHead className="font-medium text-gray-600">建立人員</TableHead>
                                <TableHead className="text-center font-medium text-gray-600">操作</TableHead>
                            </TableRow>
                        </TableHeader>
                        <TableBody>
                            {orders.data.length === 0 ? (
                                <TableRow>
                                    <TableCell colSpan={9} className="text-center h-24 text-gray-500">
                                        尚無調撥紀錄
                                    </TableCell>
                                </TableRow>
                            ) : (
                                orders.data.map((order: any, index: number) => (
                                    <TableRow
                                        key={order.id}
                                        className="hover:bg-gray-50/50 transition-colors cursor-pointer group"
                                        onClick={() => router.visit(route('inventory.transfer.show', [order.id]))}
                                    >
                                        <TableCell className="text-center text-gray-500 font-medium">
                                            {(orders.current_page - 1) * orders.per_page + index + 1}
                                        </TableCell>
                                        <TableCell className="font-medium text-primary-main">{order.doc_no}</TableCell>
                                        <TableCell className="text-center">{getStatusBadge(order.status)}</TableCell>
                                        <TableCell className="text-gray-700">{order.from_warehouse_name}</TableCell>
                                        <TableCell className="text-gray-700">{order.to_warehouse_name}</TableCell>
                                        <TableCell className="text-gray-500 text-sm">{order.created_at}</TableCell>
                                        <TableCell className="text-gray-500 text-sm">{order.posted_at || '-'}</TableCell>
                                        <TableCell className="text-sm">{order.created_by}</TableCell>
                                        <TableCell className="text-center">
                                            <div className="flex items-center justify-center gap-2" onClick={(e) => e.stopPropagation()}>
                                                <Can permission="inventory.view">
                                                    <Link href={route('inventory.transfer.show', [order.id])}>
                                                        <Button
                                                            variant="outline"
                                                            size="sm"
                                                            className="button-outlined-primary"
                                                            title={['completed', 'voided'].includes(order.status) ? '查閱' : '編輯'}
                                                        >
                                                            {['completed', 'voided'].includes(order.status) ? (
                                                                <Eye className="w-4 h-4 ml-0.5" />
                                                            ) : (
                                                                <Pencil className="w-4 h-4 ml-0.5" />
                                                            )}
                                                        </Button>
                                                    </Link>
                                                    {order.status === 'draft' && (
                                                        <Button
                                                            variant="outline"
                                                            size="sm"
                                                            className="button-outlined-error"
                                                            title="刪除"
                                                            onClick={() => confirmDelete(order.id)}
                                                        >
                                                            <Trash2 className="w-4 h-4 ml-0.5" />
                                                        </Button>
                                                    )}
                                                </Can>
                                            </div>
                                        </TableCell>
                                    </TableRow>
                                ))
                            )}
                        </TableBody>
                    </Table>
                </div>

                <div className="mt-4 flex flex-col sm:flex-row items-center justify-between gap-4">
                    <div className="flex items-center gap-4">
                        <div className="flex items-center gap-2 text-sm text-gray-500">
                            <span>每頁顯示</span>
                            <SearchableSelect
                                value={perPage}
                                onValueChange={handlePerPageChange}
                                options={[
                                    { label: "10", value: "10" },
                                    { label: "20", value: "20" },
                                    { label: "50", value: "50" },
                                    { label: "100", value: "100" }
                                ]}
                                className="w-[100px] h-8"
                                showSearch={false}
                            />
                            <span>筆</span>
                        </div>
                        <span className="text-sm text-gray-500">共 {orders.total} 筆紀錄</span>
                    </div>
                    <Pagination links={orders.links} />
                </div>

                <AlertDialog open={!!deleteId} onOpenChange={(open) => !open && setDeleteId(null)}>
                    <AlertDialogContent>
                        <AlertDialogHeader>
                            <AlertDialogTitle>確定要刪除此調撥單嗎？</AlertDialogTitle>
                            <AlertDialogDescription>
                                此動作無法復原。如果單據已存在重要資料，請謹慎操作。
                            </AlertDialogDescription>
                        </AlertDialogHeader>
                        <AlertDialogFooter>
                            <AlertDialogCancel>取消</AlertDialogCancel>
                            <AlertDialogAction onClick={handleDelete} className="bg-red-600 hover:bg-red-700">確認刪除</AlertDialogAction>
                        </AlertDialogFooter>
                    </AlertDialogContent>
                </AlertDialog>
            </div>
        </AuthenticatedLayout>
    );
}