import { Form, Head, Link, router } from '@inertiajs/react';
import { GripVertical, Map, Pencil, Plus, Trash2, X, ChevronDown, BookOpen, Search, Check, Eye, ExternalLink, Users, ImagePlus } from 'lucide-react';
import { DeleteConfirmModal } from '@/components/delete-confirm-modal';
import { useMemo, useState, useRef } from 'react';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import {
    Dialog,
    DialogContent,
    DialogDescription,
    DialogFooter,
    DialogHeader,
    DialogTitle,
} from '@/components/ui/dialog';
import AppLayout from '@/layouts/app-layout';
import type { BreadcrumbItem } from '@/types';

type Course = {
    id: number;
    title: string;
    slug: string;
    level: string;
    thumbnail: string | null;
    status: 'draft' | 'pending_review' | 'published' | 'rejected' | 'archived';
    price_type: 'free' | 'paid';
    enrollments_count: number;
    chapters_count: number;
    instructor: { name: string } | null;
    category: { name: string } | null;
};
type LearningPath = {
    id: number;
    title: string;
    slug: string;
    description: string | null;
    is_published: boolean;
    courses_count: number;
    courses: Course[];
    creator: { id: number; name: string };
};

type Props = { paths: LearningPath[]; availableCourses: { id: number; title: string; slug: string; level: string }[] };

const breadcrumbs: BreadcrumbItem[] = [
    { title: 'Admin', href: '/admin' },
    { title: 'Paket Belajar', href: '/admin/learning-paths' },
];

const STATUS_CONFIG: Record<string, { label: string; statusBadge: string; dot: string }> = {
    draft:          { label: 'Draft',        statusBadge: 'bg-slate-100/90 text-slate-600 border-slate-300/50',   dot: 'bg-slate-400' },
    pending_review: { label: 'Perlu Review', statusBadge: 'bg-amber-100/90 text-amber-700 border-amber-300/50',   dot: 'bg-amber-500' },
    published:      { label: 'Aktif',        statusBadge: 'bg-emerald-100/90 text-emerald-700 border-emerald-300/50', dot: 'bg-emerald-500' },
    rejected:       { label: 'Ditolak',      statusBadge: 'bg-red-100/90 text-red-600 border-red-300/50',         dot: 'bg-red-500' },
    archived:       { label: 'Arsip',        statusBadge: 'bg-slate-100/90 text-slate-500 border-slate-300/50',   dot: 'bg-slate-300' },
};

const CARD_GRADIENTS = [
    'from-blue-200 to-indigo-200',
    'from-sky-200 to-blue-200',
    'from-teal-200 to-emerald-200',
    'from-rose-200 to-pink-200',
    'from-amber-200 to-orange-200',
    'from-cyan-200 to-sky-200',
    'from-purple-200 to-indigo-200',
    'from-green-200 to-teal-200',
];

const LEVEL_LABELS: Record<string, string> = {
    beginner: 'Pemula',
    intermediate: 'Menengah',
    advanced: 'Lanjutan',
};

function StatusDot({ status }: { status: string }) {
    const cfg = STATUS_CONFIG[status] ?? STATUS_CONFIG.draft;
    return (
        <span className={`inline-flex items-center gap-1.5 rounded-full px-2.5 py-1 text-xs font-semibold ${cfg.statusBadge} border`}>
            <span className={`h-1.5 w-1.5 rounded-full ${cfg.dot}`} />
            {cfg.label}
        </span>
    );
}

const PAGE_SIZE = 10;

function PathForm({ onDone }: { onDone?: () => void }) {
    const [thumbPreview, setThumbPreview] = useState<string | null>(null);
    const thumbInputRef = useRef<HTMLInputElement>(null);

    function handleThumbChange(e: React.ChangeEvent<HTMLInputElement>) {
        const file = e.target.files?.[0];
        if (!file) return;
        setThumbPreview(URL.createObjectURL(file));
    }

    function clearThumb() {
        setThumbPreview(null);
        if (thumbInputRef.current) thumbInputRef.current.value = '';
    }

    const handleDone = () => {
        clearThumb();
        if (onDone) onDone();
    };

    return (
        <Form action="/admin/learning-paths" method="post" resetOnSuccess onSuccess={handleDone}>
            {({ errors, processing }) => (
                <div className="flex flex-col gap-4">
                    <div className="grid gap-1.5">
                        <label className="text-xs font-semibold text-blue-900 dark:text-blue-200">Cover Gambar Paket Belajar</label>
                        <input
                            ref={thumbInputRef}
                            type="file"
                            name="thumbnail"
                            accept="image/*"
                            className="hidden"
                            onChange={handleThumbChange}
                        />
                        {thumbPreview ? (
                            <div className="relative w-full max-w-sm overflow-hidden rounded-xl border border-blue-150 shadow-xs">
                                <img src={thumbPreview} alt="Preview" className="h-40 w-full object-cover" />
                                <button
                                    type="button"
                                    onClick={clearThumb}
                                    className="absolute right-2 top-2 flex h-7 w-7 items-center justify-center rounded-full bg-black/60 text-white hover:bg-black/80 transition-colors"
                                >
                                    <X className="h-4 w-4" />
                                </button>
                            </div>
                        ) : (
                            <button
                                type="button"
                                onClick={() => thumbInputRef.current?.click()}
                                className="flex h-40 w-full max-w-sm flex-col items-center justify-center gap-2 rounded-xl border-2 border-dashed border-blue-200 bg-blue-50/20 transition-colors hover:border-blue-400 hover:bg-blue-50/50 dark:border-blue-900/30 dark:bg-blue-950/5 dark:hover:bg-blue-950/15"
                            >
                                <ImagePlus className="h-7 w-7 text-blue-500/70 dark:text-blue-400/70" />
                                <span className="text-xs font-medium text-blue-800 dark:text-blue-350">Pilih gambar cover (.png, .jpg, .jpeg)</span>
                            </button>
                        )}
                        {errors.thumbnail && <p className="mt-1 text-xs text-destructive">{errors.thumbnail}</p>}
                    </div>

                    <div className="grid gap-1.5">
                        <label className="text-xs font-semibold text-blue-900 dark:text-blue-200">Judul Paket Belajar</label>
                        <input
                            name="title"
                            placeholder="Misal: Kurikulum Web Developer"
                            required
                            className="border-blue-100 focus-visible:border-blue-400 focus-visible:ring-blue-200 w-full rounded-xl border bg-background px-3 py-2 text-sm outline-none focus-visible:ring-[3px] transition-all"
                        />
                        {errors.title && <p className="mt-1 text-xs text-destructive">{errors.title}</p>}
                    </div>
                    <div className="grid gap-1.5">
                        <label className="text-xs font-semibold text-blue-900 dark:text-blue-200">Deskripsi Kurikulum</label>
                        <textarea
                            name="description"
                            placeholder="Tulis penjelasan singkat mengenai kurikulum ini..."
                            rows={3}
                            className="border-blue-100 focus-visible:border-blue-400 focus-visible:ring-blue-200 w-full rounded-xl border bg-background px-3 py-2 text-sm outline-none focus-visible:ring-[3px] resize-none transition-all"
                        />
                    </div>
                    <label className="flex cursor-pointer items-center gap-2.5 text-sm select-none">
                        <input type="checkbox" name="is_published" value="1" className="h-4.5 w-4.5 rounded-md border-blue-200 text-blue-600 focus:ring-blue-500" />
                        <span className="text-sm font-medium text-zinc-700 dark:text-zinc-300">Publikasikan sekarang agar dapat dilihat siswa</span>
                    </label>
                    <div className="flex justify-end gap-2 pt-2">
                        {onDone && (
                            <Button type="button" variant="outline" onClick={handleDone} className="rounded-xl px-4">
                                Batal
                            </Button>
                        )}
                        <Button type="submit" disabled={processing} className="rounded-xl bg-blue-600 hover:bg-blue-700 px-5">
                            Simpan Paket Belajar
                        </Button>
                    </div>
                </div>
            )}
        </Form>
    );
}

function EditPathModal({ path, open, onClose }: { path: LearningPath; open: boolean; onClose: () => void }) {
    const [thumbPreview, setThumbPreview] = useState<string | null>(path.thumbnail);
    const thumbInputRef = useRef<HTMLInputElement>(null);

    function handleThumbChange(e: React.ChangeEvent<HTMLInputElement>) {
        const file = e.target.files?.[0];
        if (!file) return;
        setThumbPreview(URL.createObjectURL(file));
    }

    function clearThumb() {
        setThumbPreview(null);
        if (thumbInputRef.current) thumbInputRef.current.value = '';
    }

    const handleClose = () => {
        setThumbPreview(path.thumbnail);
        onClose();
    };

    return (
        <Dialog open={open} onOpenChange={(v) => !v && handleClose()}>
            <DialogContent className="max-w-md">
                <DialogHeader>
                    <DialogTitle>Edit Paket Belajar</DialogTitle>
                    <DialogDescription>Perbarui judul, deskripsi, dan status publikasi paket belajar.</DialogDescription>
                </DialogHeader>
                <Form action={`/admin/learning-paths/${path.id}`} method="post" onSuccess={onClose}>
                    {({ errors, processing }) => (
                        <div className="flex flex-col gap-4 mt-3">
                            <input type="hidden" name="_method" value="PATCH" />

                            <div className="grid gap-1.5">
                                <label className="text-xs font-semibold text-zinc-700 dark:text-zinc-305">Cover Gambar Paket Belajar</label>
                                <input
                                    ref={thumbInputRef}
                                    type="file"
                                    name="thumbnail"
                                    accept="image/*"
                                    className="hidden"
                                    onChange={handleThumbChange}
                                />
                                {thumbPreview ? (
                                    <div className="relative w-full overflow-hidden rounded-xl border border-zinc-200 dark:border-zinc-800 shadow-xs">
                                        <img src={thumbPreview} alt="Preview" className="h-40 w-full object-cover" />
                                        <button
                                            type="button"
                                            onClick={clearThumb}
                                            className="absolute right-2 top-2 flex h-7 w-7 items-center justify-center rounded-full bg-black/60 text-white hover:bg-black/80 transition-colors"
                                        >
                                            <X className="h-4 w-4" />
                                        </button>
                                    </div>
                                ) : (
                                    <button
                                        type="button"
                                        onClick={() => thumbInputRef.current?.click()}
                                        className="flex h-40 w-full flex-col items-center justify-center gap-2 rounded-xl border-2 border-dashed border-zinc-200 bg-zinc-50/20 transition-colors hover:border-blue-400 hover:bg-blue-50/50 dark:border-zinc-800 dark:bg-zinc-950/5 dark:hover:bg-blue-950/15"
                                    >
                                        <ImagePlus className="h-7 w-7 text-zinc-400" />
                                        <span className="text-xs font-medium text-zinc-600 dark:text-zinc-400">Pilih gambar cover (.png, .jpg, .jpeg)</span>
                                    </button>
                                )}
                                {errors.thumbnail && <p className="mt-1 text-xs text-destructive">{errors.thumbnail}</p>}
                            </div>

                            <div className="grid gap-1.5">
                                <label className="text-xs font-semibold text-zinc-700 dark:text-zinc-350">Judul Paket</label>
                                <input
                                    name="title"
                                    defaultValue={path.title}
                                    placeholder="Judul paket belajar..."
                                    required
                                    className="border-zinc-200 focus-visible:border-blue-400 w-full rounded-xl border bg-background px-3 py-2 text-sm outline-none focus-visible:ring-[3px] focus-visible:ring-blue-200"
                                />
                                {errors.title && <p className="mt-1 text-xs text-destructive">{errors.title}</p>}
                            </div>
                            <div className="grid gap-1.5">
                                <label className="text-xs font-semibold text-zinc-700 dark:text-zinc-350">Deskripsi</label>
                                <textarea
                                    name="description"
                                    defaultValue={path.description ?? ''}
                                    placeholder="Deskripsi (opsional)..."
                                    rows={3}
                                    className="border-zinc-200 focus-visible:border-blue-400 w-full rounded-xl border bg-background px-3 py-2 text-sm outline-none focus-visible:ring-[3px] focus-visible:ring-blue-200 resize-none"
                                />
                            </div>
                            <label className="flex cursor-pointer items-center gap-2 text-sm select-none">
                                <input type="checkbox" name="is_published" value="1" defaultChecked={path.is_published} className="h-4.5 w-4.5 rounded-md border-zinc-300 text-blue-600 focus:ring-blue-500" />
                                <span className="font-medium text-zinc-700 dark:text-zinc-300">Publikasikan paket ini</span>
                            </label>
                            <DialogFooter className="gap-2 pt-2">
                                <Button type="button" variant="outline" onClick={handleClose} className="rounded-xl">
                                    Batal
                                </Button>
                                <Button type="submit" disabled={processing} className="rounded-xl bg-blue-600 hover:bg-blue-700">
                                    Simpan Perubahan
                                </Button>
                            </DialogFooter>
                        </div>
                    )}
                </Form>
            </DialogContent>
        </Dialog>
    );
}

function AddCourseForm({ pathId, availableCourses }: { pathId: number; availableCourses: Course[] }) {
    return (
        <Form action={`/admin/learning-paths/${pathId}/courses`} method="post" resetOnSuccess>
            {({ processing }) => (
                <div className="flex gap-2">
                    <select
                        name="course_id"
                        required
                        className="border-blue-100 focus-visible:border-blue-400 flex-1 rounded-xl border bg-background px-3 py-2 text-sm outline-none transition-all dark:border-blue-900/50"
                    >
                        <option value="">Pilih kelas untuk ditambahkan...</option>
                        {availableCourses.map((c) => (
                            <option key={c.id} value={c.id}>{c.title}</option>
                        ))}
                    </select>
                    <Button type="submit" disabled={processing} className="rounded-xl bg-blue-600 hover:bg-blue-700 px-4 shrink-0">
                        <Plus className="h-4 w-4 mr-1.5" /> Tambah Kelas
                    </Button>
                </div>
            )}
        </Form>
    );
}

export default function AdminLearningPathsIndex({ paths, availableCourses }: Props) {
    const [showForm, setShowForm] = useState(false);
    const [expandedPath, setExpandedPath] = useState<number | null>(null);
    const [editingPath, setEditingPath] = useState<LearningPath | null>(null);
    const [deleteModal, setDeleteModal] = useState<{ open: boolean; id: number | null; title: string }>({ open: false, id: null, title: '' });

    const [search, setSearch] = useState('');
    const [statusFilter, setStatusFilter] = useState<'' | 'published' | 'draft'>('');
    const [page, setPage] = useState(1);

    const filtered = useMemo(() => {
        let result = paths;
        if (statusFilter === 'published') result = result.filter((p) => p.is_published);
        if (statusFilter === 'draft') result = result.filter((p) => !p.is_published);
        if (search.trim()) {
            const q = search.toLowerCase();
            result = result.filter(
                (p) => p.title.toLowerCase().includes(q) || (p.description ?? '').toLowerCase().includes(q),
            );
        }
        return result;
    }, [paths, statusFilter, search]);

    const totalPages = Math.max(1, Math.ceil(filtered.length / PAGE_SIZE));
    const safePage = Math.min(page, totalPages);
    const pageData = filtered.slice((safePage - 1) * PAGE_SIZE, safePage * PAGE_SIZE);

    function deletePath(path: LearningPath) {
        setDeleteModal({ open: true, id: path.id, title: path.title });
    }

    function confirmDelete() {
        if (!deleteModal.id) return;
        router.delete(`/admin/learning-paths/${deleteModal.id}`, {
            onSuccess: () => setDeleteModal({ open: false, id: null, title: '' }),
        });
    }

    function togglePublish(path: LearningPath) {
        router.patch(`/admin/learning-paths/${path.id}`, {
            title: path.title,
            description: path.description ?? '',
            is_published: !path.is_published,
        });
    }

    function removeCourse(pathId: number, courseId: number) {
        router.delete(`/admin/learning-paths/${pathId}/courses/${courseId}`);
    }

    function changeStatus(courseId: number, status: string) {
        router.patch(`/admin/courses/${courseId}/status`, { status });
    }

    const [draggedItemIndex, setDraggedItemIndex] = useState<number | null>(null);

    function handleDragStart(e: React.DragEvent, index: number) {
        setDraggedItemIndex(index);
        e.dataTransfer.effectAllowed = 'move';
        e.dataTransfer.setData('text/plain', index.toString());
    }

    function handleDragOver(e: React.DragEvent, index: number) {
        e.preventDefault();
    }

    function handleDrop(e: React.DragEvent, targetIndex: number, path: LearningPath) {
        e.preventDefault();
        const sourceIndex = draggedItemIndex !== null ? draggedItemIndex : parseInt(e.dataTransfer.getData('text/plain'), 10);
        if (sourceIndex === null || sourceIndex === targetIndex) {
            return;
        }

        const newCourses = [...path.courses];
        const [removed] = newCourses.splice(sourceIndex, 1);
        newCourses.splice(targetIndex, 0, removed);

        const orderIds = newCourses.map((c) => c.id);
        router.patch(`/admin/learning-paths/${path.id}/reorder`, {
            order: orderIds,
        }, {
            preserveScroll: true,
        });

        setDraggedItemIndex(null);
    }

    return (
        <>
            <Head title="Paket Belajar — Admin" />

            <div className="flex flex-col gap-6 p-4 md:p-6">
                {/* Header */}
                <div className="relative overflow-hidden rounded-2xl border border-blue-100 bg-gradient-to-br from-blue-50 via-white to-indigo-50 p-5 shadow-sm dark:border-blue-800/30 dark:from-blue-950/40 dark:via-card dark:to-indigo-950/30">
                    <div className="relative z-10 flex items-center justify-between">
                        <div className="flex items-center gap-3">
                            <div className="flex h-10 w-10 items-center justify-center rounded-xl bg-blue-100 dark:bg-blue-800/60">
                                <Map className="h-5 w-5 text-blue-600 dark:text-blue-300" />
                            </div>
                            <div>
                                <h1 className="text-xl font-bold text-blue-900 dark:text-blue-100">Paket Belajar</h1>
                                <p className="text-sm text-blue-600 dark:text-blue-400">
                                    Total <span className="font-semibold">{paths.length}</span> kurikulum pembelajaran multi-kelas
                                </p>
                            </div>
                        </div>
                        <Button size="sm" onClick={() => setShowForm(true)} className="gap-1.5 bg-blue-600 hover:bg-blue-700 shadow-sm rounded-xl">
                            <Plus className="h-4 w-4" />
                            Buat Paket Belajar
                        </Button>
                    </div>
                    <div className="absolute -right-4 -top-4 h-20 w-20 rounded-full bg-blue-100/40 dark:bg-blue-700/10" />
                    <div className="absolute right-10 -bottom-6 h-28 w-28 rounded-full bg-indigo-100/30 dark:bg-indigo-700/10" />
                </div>

                {/* Search + filter toolbar */}
                <div className="flex flex-col gap-4 lg:flex-row lg:items-center lg:justify-between border-b border-blue-50 pb-4 dark:border-blue-900/20">
                    <div className="relative max-w-xs flex-1">
                        <Search className="absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
                        <Input
                            placeholder="Cari paket belajar..."
                            value={search}
                            onChange={(e) => { setSearch(e.target.value); setPage(1); }}
                            className="pl-9 pr-8 h-9 rounded-xl border-blue-100/80 focus-visible:ring-blue-200"
                        />
                        {search && (
                            <button
                                onClick={() => { setSearch(''); setPage(1); }}
                                className="absolute right-2.5 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
                            >
                                <X className="h-3.5 w-3.5" />
                            </button>
                        )}
                    </div>

                    <div className="flex flex-wrap gap-1.5">
                        {([
                            { value: '' as const, label: 'Semua' },
                            { value: 'published' as const, label: 'Publik' },
                            { value: 'draft' as const, label: 'Draft' },
                        ] as const).map(({ value, label }) => (
                            <button
                                key={value}
                                onClick={() => { setStatusFilter(value); setPage(1); }}
                                className={`rounded-full px-3.5 py-1.5 text-xs font-medium transition-all cursor-pointer ${
                                    statusFilter === value
                                        ? 'bg-blue-600 text-white shadow-xs'
                                        : 'bg-zinc-100 text-zinc-700 hover:bg-zinc-200 hover:text-blue-700 dark:bg-zinc-800 dark:text-zinc-300 dark:hover:bg-zinc-700/80 dark:hover:text-blue-400'
                                }`}
                            >
                                {label}
                            </button>
                        ))}
                    </div>
                </div>

                {/* Paths list */}
                <div className="flex flex-col gap-4">
                    {pageData.map((path, idx) => {
                        const isExpanded = expandedPath === path.id;
                        // Pastel indicators matching category list colors
                        const colors = [
                            { bg: 'bg-blue-100 dark:bg-blue-900/30', text: 'text-blue-700 dark:text-blue-400' },
                            { bg: 'bg-emerald-100 dark:bg-emerald-900/30', text: 'text-emerald-700 dark:text-emerald-400' },
                            { bg: 'bg-cyan-100 dark:bg-cyan-900/30', text: 'text-cyan-700 dark:text-cyan-400' },
                        ];
                        const pathColor = colors[idx % colors.length];

                        return (
                            <div key={path.id} className="overflow-hidden rounded-2xl border border-blue-100 bg-white shadow-xs dark:border-blue-900/30 dark:bg-card hover:shadow-md transition-shadow duration-200">
                                <div className="flex flex-col sm:flex-row sm:items-center justify-between gap-4 p-5">
                                    <div className="flex items-center gap-4 min-w-0">
                                        {/* Icon/Thumbnail Box */}
                                        {path.thumbnail ? (
                                            <div className="h-12 w-12 shrink-0 overflow-hidden rounded-xl border border-blue-100 dark:border-blue-900/40 shadow-2xs">
                                                <img src={path.thumbnail} alt={path.title} className="h-full w-full object-cover" />
                                            </div>
                                        ) : (
                                            <div className={`flex h-12 w-12 shrink-0 items-center justify-center rounded-xl ${pathColor.bg}`}>
                                                <Map className={`h-5 w-5 ${pathColor.text}`} />
                                            </div>
                                        )}

                                        <div className="min-w-0">
                                            <div className="flex items-center gap-2 flex-wrap">
                                                <p className="font-bold text-zinc-900 dark:text-zinc-100 text-base">{path.title}</p>
                                                <span className={`rounded-full px-2.5 py-0.5 text-xs font-semibold ${
                                                    path.is_published
                                                        ? 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/40 dark:text-emerald-400'
                                                        : 'bg-zinc-100 text-zinc-600 dark:bg-zinc-800 dark:text-zinc-400'
                                                }`}>
                                                    {path.is_published ? 'Publik' : 'Draft'}
                                                </span>
                                            </div>
                                            {path.description && (
                                                <p className="mt-1 text-xs text-muted-foreground line-clamp-2 max-w-xl leading-relaxed">
                                                    {path.description}
                                                </p>
                                            )}
                                            <div className="mt-2 flex items-center gap-3 text-xs text-muted-foreground font-medium">
                                                <span className="flex items-center gap-1 bg-blue-50/50 dark:bg-blue-950/20 px-2 py-0.5 rounded-md border border-blue-100/50 dark:border-blue-900/30 text-blue-700 dark:text-blue-400">
                                                    <BookOpen className="h-3.5 w-3.5" />
                                                    {path.courses_count} kelas
                                                </span>
                                                <span className="flex items-center gap-1 bg-emerald-50/50 dark:bg-emerald-950/20 px-2 py-0.5 rounded-md border border-emerald-100/50 dark:border-emerald-900/30 text-emerald-700 dark:text-emerald-400">
                                                    {path.courses?.reduce((sum, c) => sum + (c.price_type === 'paid' ? (c.price || 0) : 0), 0) === 0 ? '✦ Gratis' : `Rp ${path.courses?.reduce((sum, c) => sum + (c.price_type === 'paid' ? (c.price || 0) : 0), 0).toLocaleString('id-ID')}`}
                                                </span>
                                                <span className="text-[10px]">Dibuat oleh {path.creator.name}</span>
                                            </div>
                                        </div>
                                    </div>

                                    {/* Action items with pastel color styling */}
                                    <div className="flex items-center gap-2 self-end sm:self-center shrink-0">
                                        <button
                                            onClick={() => togglePublish(path)}
                                            className={`flex h-8 items-center gap-1.5 rounded-lg px-3 text-xs font-bold transition-colors ${
                                                path.is_published
                                                    ? 'bg-zinc-100 text-zinc-700 hover:bg-zinc-200 dark:bg-zinc-800 dark:text-zinc-400'
                                                    : 'bg-emerald-100 text-emerald-700 hover:bg-emerald-200 dark:bg-emerald-900/30 dark:text-emerald-400'
                                            }`}
                                        >
                                            {path.is_published ? 'Sembunyikan' : 'Publikasikan'}
                                        </button>
                                        <button
                                            onClick={() => setExpandedPath(isExpanded ? null : path.id)}
                                            className={`flex h-8 items-center gap-1 rounded-lg px-3 text-xs font-bold transition-colors ${
                                                isExpanded
                                                    ? 'bg-blue-200 text-blue-800 dark:bg-blue-900/50 dark:text-blue-300'
                                                    : 'bg-blue-100 text-blue-700 hover:bg-blue-200 dark:bg-blue-900/30 dark:text-blue-400'
                                            }`}
                                        >
                                            Kelas
                                            <ChevronDown className={`h-3.5 w-3.5 transition-transform duration-255 ${isExpanded ? 'rotate-180' : ''}`} />
                                        </button>
                                        <button
                                            onClick={() => setEditingPath(path)}
                                            className="flex h-8 w-8 items-center justify-center rounded-lg bg-amber-100 text-amber-700 hover:bg-amber-200 transition-colors dark:bg-amber-900/30 dark:text-amber-400"
                                            title="Edit"
                                        >
                                            <Pencil className="h-3.5 w-3.5" />
                                        </button>
                                        <button
                                            onClick={() => deletePath(path)}
                                            className="flex h-8 w-8 items-center justify-center rounded-lg bg-red-100 text-red-700 hover:bg-red-200 transition-colors dark:bg-red-900/30 dark:text-red-400"
                                            title="Hapus"
                                        >
                                            <Trash2 className="h-3.5 w-3.5" />
                                        </button>
                                    </div>
                                </div>

                                {isExpanded && (
                                    <div className="border-t border-blue-50 bg-blue-50/10 p-5 dark:border-blue-900/20 dark:bg-zinc-950/20 animate-in slide-in-from-top-2 duration-200">
                                        <div className="flex items-center justify-between mb-3">
                                            <h3 className="text-xs font-bold uppercase tracking-wider text-blue-700 dark:text-blue-400">Kelas dalam Path</h3>
                                            <p className="text-[10px] text-muted-foreground flex items-center gap-1">
                                                <GripVertical className="h-3.5 w-3.5" /> Susunan kurikulum berurutan
                                            </p>
                                        </div>

                                        {path.courses.length > 0 ? (
                                            <div className="mb-4 grid gap-5 sm:grid-cols-2 lg:grid-cols-3">
                                                {path.courses.map((course, i) => {
                                                    const gradient = CARD_GRADIENTS[course.id % CARD_GRADIENTS.length];
                                                    const initials = course.title
                                                        .split(' ')
                                                        .slice(0, 2)
                                                        .map((w) => w[0])
                                                        .join('')
                                                        .toUpperCase();
                                                    return (
                                                        <div
                                                            key={course.id}
                                                            draggable
                                                            onDragStart={(e) => handleDragStart(e, i)}
                                                            onDragOver={(e) => handleDragOver(e, i)}
                                                            onDrop={(e) => handleDrop(e, i, path)}
                                                            onDragEnd={() => setDraggedItemIndex(null)}
                                                            className={`group flex flex-col overflow-hidden rounded-2xl shadow-xs border border-blue-50/50 bg-white dark:border-blue-900/20 dark:bg-card transition-all duration-205 cursor-grab active:cursor-grabbing hover:shadow-md hover:-translate-y-0.5 ${draggedItemIndex === i ? 'opacity-40 border-dashed border-blue-400 scale-[0.98]' : ''}`}
                                                        >
                                                            {/* Colorful header */}
                                                            <div
                                                                className={`relative cursor-pointer overflow-hidden p-4 ${course.thumbnail ? '' : `bg-gradient-to-br ${gradient}`}`}
                                                                style={course.thumbnail ? { backgroundImage: `url(${course.thumbnail})`, backgroundSize: 'cover', backgroundPosition: 'center' } : undefined}
                                                                onClick={() => router.visit(`/admin/courses/${course.id}`)}
                                                            >
                                                                {/* Overlay when thumbnail is set */}
                                                                {course.thumbnail && (
                                                                    <div className="absolute inset-0 bg-gradient-to-br from-black/60 via-black/40 to-black/20" />
                                                                )}

                                                                {/* Decorative circles */}
                                                                <div className="absolute -right-6 -top-6 h-20 w-20 rounded-full bg-slate-900/5" />
                                                                <div className="absolute -right-2 bottom-0 h-12 w-12 rounded-full bg-slate-900/5" />

                                                                {/* Top row: status + price + grip */}
                                                                <div className="relative flex items-center justify-between mb-3">
                                                                    <div className="flex items-center gap-1.5">
                                                                        <GripVertical className={`h-4 w-4 cursor-grab active:cursor-grabbing shrink-0 transition-opacity opacity-60 group-hover:opacity-100 ${course.thumbnail ? 'text-white' : 'text-slate-700'}`} />
                                                                        <StatusDot status={course.status} />
                                                                    </div>
                                                                    <span className={`rounded-full px-2 py-0.5 text-[10px] font-semibold border ${
                                                                        course.price_type === 'free'
                                                                            ? 'bg-emerald-100/90 text-emerald-700 border-emerald-300/50'
                                                                            : 'bg-white/70 text-slate-700 border-slate-300/50'
                                                                    }`}>
                                                                        {course.price_type === 'free' ? '✦ Gratis' : `Rp ${course.price.toLocaleString('id-ID')}`}
                                                                    </span>
                                                                </div>

                                                                {/* Big initials icon */}
                                                                <div className="relative mb-1 flex items-center gap-2.5">
                                                                    <div className="flex h-11 w-11 shrink-0 items-center justify-center rounded-xl bg-white/60 text-lg font-bold text-slate-700 shadow-xs">
                                                                        {initials}
                                                                    </div>
                                                                    <div className="min-w-0 flex-1">
                                                                        <p className={`font-bold leading-snug line-clamp-2 text-sm ${course.thumbnail ? 'text-white' : 'text-slate-800'}`}>
                                                                            {course.title}
                                                                        </p>
                                                                    </div>
                                                                </div>
                                                                
                                                                {/* Order Number Badge */}
                                                                <div className="absolute top-2 left-2 flex h-5 w-5 items-center justify-center rounded-full bg-blue-600 text-[10px] font-bold text-white shadow-sm border border-white">
                                                                    {i + 1}
                                                                </div>
                                                            </div>

                                                            {/* White body */}
                                                            <div
                                                                className="flex flex-1 cursor-pointer flex-col gap-2 bg-white px-3.5 pt-2.5 pb-2 dark:bg-card"
                                                                onClick={() => router.visit(`/admin/courses/${course.id}`)}
                                                            >
                                                                <div className="flex flex-col gap-1 text-[11px] text-muted-foreground">
                                                                    <div className="flex items-center gap-1.5 truncate">
                                                                        <span className="h-1.5 w-1.5 rounded-full bg-blue-400 shrink-0" />
                                                                        <span className="font-medium text-foreground shrink-0">Instruktur:</span>
                                                                        <span className="truncate">{course.instructor?.name ?? '-'}</span>
                                                                    </div>
                                                                    <div className="flex items-center gap-1.5 truncate">
                                                                        <span className="h-1.5 w-1.5 rounded-full bg-teal-400 shrink-0" />
                                                                        <span className="font-medium text-foreground shrink-0">Kategori:</span>
                                                                        <span className="truncate">{course.category?.name ?? '-'}</span>
                                                                    </div>
                                                                </div>

                                                                <div className="flex items-center gap-1.5">
                                                                    <span className="rounded-full bg-slate-100 px-2 py-0.5 text-[10px] text-slate-600 font-medium dark:bg-slate-800 dark:text-slate-400">
                                                                        {LEVEL_LABELS[course.level] ?? course.level}
                                                                    </span>
                                                                </div>

                                                                <div className="flex items-center gap-1.5 rounded-lg bg-muted/50 px-2 py-1 text-[10px]">
                                                                    <Users className="h-3 w-3 text-blue-500 shrink-0" />
                                                                    <span className="font-bold text-foreground">{course.enrollments_count ?? 0}</span>
                                                                    <span className="text-muted-foreground">peserta terdaftar</span>
                                                                </div>
                                                            </div>

                                                            {/* Footer */}
                                                            <div
                                                                className="flex items-center gap-1.5 border-t bg-white px-3 py-2 dark:bg-card"
                                                                onClick={(e) => e.stopPropagation()}
                                                            >
                                                                <select
                                                                    value={course.status}
                                                                    onChange={(e) => changeStatus(course.id, e.target.value)}
                                                                    className="flex-1 rounded-lg border border-input bg-background px-2 py-1 text-[11px] focus:border-blue-400 focus:outline-none focus:ring-1 focus:ring-blue-200"
                                                                >
                                                                    <option value="draft">Draft</option>
                                                                    <option value="pending_review">Perlu Review</option>
                                                                    <option value="published">Aktif</option>
                                                                    <option value="rejected">Ditolak</option>
                                                                    <option value="archived">Arsip</option>
                                                                </select>
                                                                <Link
                                                                    href={`/admin/courses/${course.id}`}
                                                                    className="flex h-7.5 w-7.5 items-center justify-center rounded-lg bg-amber-100 text-amber-700 hover:bg-amber-200 transition-colors shadow-sm"
                                                                    title="Edit informasi kelas"
                                                                >
                                                                    <Pencil className="h-3 w-3" />
                                                                </Link>
                                                                <Link
                                                                    href={`/courses/${course.slug}`}
                                                                    className="flex h-7.5 w-7.5 items-center justify-center rounded-lg bg-blue-200 text-blue-700 hover:bg-blue-300 transition-colors shadow-sm"
                                                                    title="Lihat halaman publik"
                                                                >
                                                                    <ExternalLink className="h-3 w-3" />
                                                                </Link>
                                                                <button
                                                                    onClick={() => removeCourse(path.id, course.id)}
                                                                    className="flex h-7.5 w-7.5 items-center justify-center rounded-lg bg-red-200 text-red-700 hover:bg-red-300 transition-colors shadow-sm"
                                                                    title="Hapus dari Path"
                                                                >
                                                                    <Trash2 className="h-3.5 w-3.5" />
                                                                </button>
                                                            </div>
                                                        </div>
                                                    );
                                                })}
                                            </div>
                                        ) : (
                                            <div className="mb-4 flex flex-col items-center justify-center py-6 border border-dashed border-blue-200 rounded-xl bg-white/50 dark:border-blue-800/60">
                                                <BookOpen className="h-6 w-6 text-blue-200 mb-1" />
                                                <p className="text-xs text-muted-foreground">Belum ada kelas di dalam path ini.</p>
                                            </div>
                                        )}

                                        <div className="bg-white/60 dark:bg-card/40 p-3 rounded-xl border border-blue-50/50 dark:border-blue-900/30">
                                            <AddCourseForm
                                                pathId={path.id}
                                                availableCourses={availableCourses.filter((ac) => !path.courses.some((pc) => pc.id === ac.id))}
                                            />
                                        </div>
                                    </div>
                                )}
                            </div>
                        );
                    })}

                    {filtered.length === 0 && (
                        <div className="flex flex-col items-center justify-center rounded-2xl border border-dashed border-blue-200 py-16 text-center dark:border-blue-800/80 bg-white/50">
                            <div className="mb-4 flex h-14 w-14 items-center justify-center rounded-2xl bg-blue-50 dark:bg-blue-900/20 animate-pulse">
                                <Map className="h-7 w-7 text-blue-300" />
                            </div>
                            <p className="font-bold text-zinc-800 dark:text-zinc-200">
                                {search || statusFilter ? 'Tidak ada hasil' : 'Belum ada paket belajar'}
                            </p>
                            <p className="mt-1 text-xs text-muted-foreground max-w-xs">
                                {search || statusFilter ? 'Coba ubah filter atau kata kunci pencarian.' : 'Buat paket belajar pertama untuk mengorganisir kurikulum multi-kelas.'}
                            </p>
                        </div>
                    )}
                </div>

                {/* Pagination */}
                {totalPages > 1 && (
                    <div className="flex items-center justify-between border-t border-blue-50 pt-4 dark:border-blue-900/20">
                        <span className="text-xs text-muted-foreground font-medium">
                            Menampilkan {(safePage - 1) * PAGE_SIZE + 1}–{Math.min(safePage * PAGE_SIZE, filtered.length)} dari {filtered.length} path
                        </span>
                        <div className="flex items-center gap-1">
                            <button
                                disabled={safePage === 1}
                                onClick={() => setPage((p) => p - 1)}
                                className="flex h-8 w-8 items-center justify-center rounded-lg border border-zinc-200 text-muted-foreground transition-colors hover:bg-blue-50 hover:text-blue-700 disabled:opacity-30 dark:border-zinc-800"
                            >
                                ‹
                            </button>
                            {Array.from({ length: totalPages }, (_, i) => i + 1).map((p) => (
                                <button
                                    key={p}
                                    onClick={() => setPage(p)}
                                    className={`flex h-8 w-8 items-center justify-center rounded-lg text-xs font-semibold transition-colors ${
                                        safePage === p 
                                            ? 'bg-blue-100 text-blue-700 dark:bg-blue-900/40 dark:text-blue-300' 
                                            : 'hover:bg-blue-50 hover:text-blue-700'
                                    }`}
                                >
                                    {p}
                                </button>
                            ))}
                            <button
                                disabled={safePage === totalPages}
                                onClick={() => setPage((p) => p + 1)}
                                className="flex h-8 w-8 items-center justify-center rounded-lg border border-zinc-200 text-muted-foreground transition-colors hover:bg-blue-50 hover:text-blue-700 disabled:opacity-30 dark:border-zinc-800"
                            >
                                ›
                            </button>
                        </div>
                    </div>
                )}
            </div>

            <Dialog open={showForm} onOpenChange={setShowForm}>
                <DialogContent className="max-w-md">
                    <DialogHeader>
                        <DialogTitle>Buat Paket Belajar Baru</DialogTitle>
                        <DialogDescription>Tambahkan kurikulum pembelajaran multi-kelas baru.</DialogDescription>
                    </DialogHeader>
                    <div className="mt-3">
                        <PathForm onDone={() => setShowForm(false)} />
                    </div>
                </DialogContent>
            </Dialog>

            {editingPath && (
                <EditPathModal path={editingPath} open={true} onClose={() => setEditingPath(null)} />
            )}

            <DeleteConfirmModal
                open={deleteModal.open}
                onClose={() => setDeleteModal({ open: false, id: null, title: '' })}
                onConfirm={confirmDelete}
                title={`Hapus paket belajar "${deleteModal.title}"?`}
                description="Paket belajar yang dihapus tidak dapat dikembalikan."
            />
        </>
    );
}

AdminLearningPathsIndex.layout = (page: React.ReactNode) => (
    <AppLayout breadcrumbs={breadcrumbs}>{page}</AppLayout>
);