import AuthenticatedLayout from '@/Layouts/AuthenticatedLayout';
import { Head, useForm } from '@inertiajs/react';
import {
    Table,
    TableBody,
    TableCell,
    TableHead,
    TableHeader,
    TableRow,
} from '@/Components/ui/table';
import { Button } from '@/Components/ui/button';
import { Input } from '@/Components/ui/input';
import { Card, CardContent, CardHeader, CardTitle, CardDescription } from '@/Components/ui/card';
import { Badge } from '@/Components/ui/badge';
import { Save, CheckCircle, Printer, Trash2, ClipboardCheck, Eye, Pencil } from 'lucide-react';
import {
    AlertDialog,
    AlertDialogAction,
    AlertDialogCancel,
    AlertDialogContent,
    AlertDialogDescription,
    AlertDialogFooter,
    AlertDialogHeader,
    AlertDialogTitle,
    AlertDialogTrigger,
} from "@/Components/ui/alert-dialog"
import { Can } from '@/Components/Permission/Can';
import { Link } from '@inertiajs/react';

export default function Show({ doc }: any) {
    // Transform items to form data structure
    const { data, setData, put, delete: destroy, processing } = useForm({
        items: doc.items.map((item: any) => ({
            id: item.id,
            counted_qty: item.counted_qty,
            notes: item.notes || '',
        })),
        action: 'save', // 'save' or 'complete'
    });

    // Helper to update local form data
    const updateItem = (index: number, field: string, value: any) => {
        const newItems = [...data.items];
        newItems[index][field] = value;
        setData('items', newItems);
    };

    const handleSubmit = (action: string) => {
        setData('action', action);
        put(route('inventory.count.update', [doc.id]), {
            onSuccess: () => {
                // Handle success if needed
            }
        });
    };

    const handleDelete = () => {
        destroy(route('inventory.count.destroy', [doc.id]));
    };

    const isCompleted = doc.status === 'completed';

    // Calculate progress
    const totalItems = doc.items.length;
    const countedItems = data.items.filter((i: any) => i.counted_qty !== '' && i.counted_qty !== null).length;
    const progress = Math.round((countedItems / totalItems) * 100) || 0;

    return (
        <AuthenticatedLayout
            breadcrumbs={[
                { label: '商品與庫存管理', href: '#' },
                { label: '庫存盤點', href: route('inventory.count.index') },
                { label: `盤點單: ${doc.doc_no}`, href: route('inventory.count.show', [doc.id]), isPage: true },
            ]}
        >
            <Head title={`盤點單 ${doc.doc_no}`} />

            <div className="container mx-auto p-6 max-w-7xl">
                <div className="flex items-center justify-between mb-6">
                    <div className="flex items-center gap-4">
                        <div>
                            <div className="flex items-center gap-2">
                                <h1 className="text-2xl font-bold text-grey-0 flex items-center gap-2">
                                    <ClipboardCheck className="h-6 w-6 text-primary-main" />
                                    盤點單: {doc.doc_no}
                                </h1>
                                {doc.status === 'completed' ? (
                                    <Badge className="bg-green-500 hover:bg-green-600">已完成</Badge>
                                ) : (
                                    <Badge className="bg-blue-500 hover:bg-blue-600">盤點中</Badge>
                                )}
                            </div>
                            <p className="text-sm text-gray-500 mt-1">
                                倉庫: {doc.warehouse_name} | 建立人: {doc.created_by} | 快照時間: {doc.snapshot_date}
                            </p>
                        </div>
                    </div>
                    <div className="flex items-center gap-2">
                        {!isCompleted && (
                            <div className="flex items-center gap-2">
                                <Can permission="inventory.view">
                                    <AlertDialog>
                                        <AlertDialogTrigger asChild>
                                            <Button variant="outline" size="sm" disabled={processing} className="button-outlined-error">
                                                <Trash2 className="w-4 h-4 mr-2" />
                                                作廢盤點單
                                            </Button>
                                        </AlertDialogTrigger>
                                        <AlertDialogContent>
                                            <AlertDialogHeader>
                                                <AlertDialogTitle>確定要作廢此盤點單嗎？</AlertDialogTitle>
                                                <AlertDialogDescription>
                                                    此動作無法復原。作廢後請重新建立盤點單。
                                                </AlertDialogDescription>
                                            </AlertDialogHeader>
                                            <AlertDialogFooter>
                                                <AlertDialogCancel>取消</AlertDialogCancel>
                                                <AlertDialogAction onClick={handleDelete} className="bg-red-600 hover:bg-red-700">確認作廢</AlertDialogAction>
                                            </AlertDialogFooter>
                                        </AlertDialogContent>
                                    </AlertDialog>

                                    <Button
                                        variant="outline"
                                        size="sm"
                                        className="button-outlined-primary"
                                        onClick={() => handleSubmit('save')}
                                        disabled={processing}
                                    >
                                        <Save className="w-4 h-4 mr-2" />
                                        暫存進度
                                    </Button>
                                    <Button
                                        size="sm"
                                        className="button-filled-primary"
                                        onClick={() => handleSubmit('complete')}
                                        disabled={processing}
                                    >
                                        <CheckCircle className="w-4 h-4 mr-2" />
                                        完成盤點並過帳
                                    </Button>
                                </Can>
                            </div>
                        )}
                        {isCompleted && (
                            <Button variant="outline" size="sm" onClick={() => window.print()}>
                                <Printer className="w-4 h-4 mr-2" />
                                列印報表
                            </Button>
                        )}
                    </div>
                </div>

                <div className="max-w-7xl mx-auto space-y-6">
                    {!isCompleted && (
                        <Card className="border-none shadow-sm overflow-hidden">
                            <CardContent className="py-4">
                                <div className="flex items-center justify-between text-sm mb-2">
                                    <span className="text-gray-500">盤點進度: {countedItems} / {totalItems} 項目</span>
                                    <span className="font-semibold text-primary-main">{progress}%</span>
                                </div>
                                <div className="w-full bg-gray-200 rounded-full h-2">
                                    <div className="bg-primary-main h-2 rounded-full transition-all duration-300" style={{ width: `${progress}%` }}></div>
                                </div>
                            </CardContent>
                        </Card>
                    )}

                    <Card className="border border-gray-200 shadow-sm overflow-hidden gap-0">
                        <CardHeader className="bg-white border-b px-6 py-4">
                            <CardTitle className="text-lg font-medium">盤點明細</CardTitle>
                            <CardDescription>
                                請輸入每個項目的「實盤數量」。若有差異系統將自動計算。
                            </CardDescription>
                        </CardHeader>
                        <Table>
                            <TableHeader className="bg-gray-50">
                                <TableRow>
                                    <TableHead className="w-[50px] text-center">#</TableHead>
                                    <TableHead>商品代號 / 名稱</TableHead>
                                    <TableHead>批號</TableHead>
                                    <TableHead className="text-right">系統庫存</TableHead>
                                    <TableHead className="text-right w-32">實盤數量</TableHead>
                                    <TableHead className="text-right">差異</TableHead>
                                    <TableHead>單位</TableHead>
                                    <TableHead>備註</TableHead>
                                </TableRow>
                            </TableHeader>
                            <TableBody>
                                {doc.items.map((item: any, index: number) => {
                                    const formItem = data.items[index];
                                    const diff = formItem.counted_qty !== '' && formItem.counted_qty !== null
                                        ? (parseFloat(formItem.counted_qty) - item.system_qty)
                                        : 0;
                                    const hasDiff = Math.abs(diff) > 0.0001;

                                    return (
                                        <TableRow key={item.id} className={hasDiff && formItem.counted_qty !== '' ? "bg-red-50/30" : ""}>
                                            <TableCell className="text-gray-500 font-medium text-center">
                                                {index + 1}
                                            </TableCell>
                                            <TableCell>
                                                <div className="flex flex-col">
                                                    <span className="font-medium text-gray-900">{item.product_code}</span>
                                                    <span className="text-xs text-gray-500">{item.product_name}</span>
                                                </div>
                                            </TableCell>
                                            <TableCell className="text-sm font-mono">{item.batch_number || '-'}</TableCell>
                                            <TableCell className="text-right font-medium">{item.system_qty.toFixed(2)}</TableCell>
                                            <TableCell className="text-right px-1">
                                                {isCompleted ? (
                                                    <span className="font-medium mr-2">{item.counted_qty}</span>
                                                ) : (
                                                    <Input
                                                        type="number"
                                                        step="0.01"
                                                        value={formItem.counted_qty ?? ''}
                                                        onChange={(e) => updateItem(index, 'counted_qty', e.target.value)}
                                                        onWheel={(e: any) => e.target.blur()}
                                                        disabled={processing}
                                                        className="h-9 text-right font-medium focus:ring-primary-main"
                                                        placeholder="盤點..."
                                                    />
                                                )}
                                            </TableCell>
                                            <TableCell className="text-right">
                                                <span className={`font-bold ${!hasDiff
                                                    ? 'text-gray-400'
                                                    : diff > 0
                                                        ? 'text-green-600'
                                                        : 'text-red-600'
                                                    }`}>
                                                    {formItem.counted_qty !== '' && formItem.counted_qty !== null
                                                        ? diff.toFixed(2)
                                                        : '-'}
                                                </span>
                                            </TableCell>
                                            <TableCell className="text-sm text-gray-500">{item.unit || item.unit_name}</TableCell>
                                            <TableCell className="px-1">
                                                {isCompleted ? (
                                                    <span className="text-sm text-gray-600">{item.notes}</span>
                                                ) : (
                                                    <Input
                                                        value={formItem.notes}
                                                        onChange={(e) => updateItem(index, 'notes', e.target.value)}
                                                        disabled={processing}
                                                        className="h-9 text-sm"
                                                        placeholder="備註..."
                                                    />
                                                )}
                                            </TableCell>
                                        </TableRow>
                                    );
                                })}
                            </TableBody>
                        </Table>
                    </Card>

                    <div className="bg-gray-50/80 border border-dashed border-grey-200 rounded-lg p-4 flex items-start gap-3">
                        <div className="bg-blue-100 p-2 rounded-lg">
                            <Save className="w-5 h-5 text-blue-600" />
                        </div>
                        <div>
                            <h4 className="font-semibold text-gray-900 mb-1 text-sm">操作導引</h4>
                            <p className="text-xs text-gray-500 leading-relaxed">
                                資料會自動保存盤點人與時間。若尚未盤點完，您可以點擊「暫存進度」稍後繼續。
                                確認所有項目資料正確後，請點擊「完成盤點並過帳」正式生效庫存調整。
                            </p>
                        </div>
                    </div>
                </div>
            </div>
        </AuthenticatedLayout>
    );
}
