import { useState } from 'react';
import { Head, Link, useForm } from '@inertiajs/react';
import { router } from '@inertiajs/react';
import { ConfirmDialog } from '@/components/admin/confirm-dialog';
import { DatePicker } from '@/components/admin/date-picker';
import { ImageUpload } from '@/components/admin/image-upload';
import { RichText } from '@/components/admin/rich-text';
import { Button } from '@/components/ui/button';
import { Input } from '@/components/ui/input';
import { Label } from '@/components/ui/label';
import { Select, SelectContent, SelectItem, SelectTrigger, SelectValue } from '@/components/ui/select';

interface Event {
    id: number;
    title: string;
    description: string | null;
    location: string | null;
    image: string | null;
    starts_at: string;
    ends_at: string | null;
    type: string;
    status: string;
    max_registrations: number | null;
}

export default function EventEdit({ event, registrationCount }: { event: Event; registrationCount: number }) {
    const [imageKey, setImageKey] = useState(0);
    const [confirmDelete, setConfirmDelete] = useState(false);

    const { data, setData, post, processing, errors } = useForm({
        _method: 'PUT',
        title: event.title,
        description: event.description ?? '',
        location: event.location ?? '',
        starts_at: event.starts_at.split('T')[0] as string | null,
        ends_at: event.ends_at ? event.ends_at.split('T')[0] : null as string | null,
        type: event.type,
        status: event.status,
        max_registrations: event.max_registrations ? String(event.max_registrations) : '',
        image: null as File | null,
        image_clear: false,
    });

    function submit(e: React.FormEvent) {
        e.preventDefault();
        post(`/admin/events/${event.id}`);
    }

    return (
        <>
            <Head title="Edit Event" />
            <form onSubmit={submit} className="space-y-0">
                <div className="sticky top-16 z-10 -mx-6 mb-6 flex items-center justify-between border-b bg-background px-6 pb-4 pt-2 lg:-mx-8 lg:px-8">
                    <div>
                        <div className="flex items-center gap-2 text-sm text-muted-foreground">
                            <Link href="/admin/events">Events</Link>
                            <span>/</span>
                            <span className="text-foreground">Edit Event</span>
                        </div>
                        <h1 className="text-2xl font-bold">Edit Event <span className="text-sm font-normal text-muted-foreground ml-2">{registrationCount} registrations</span></h1>
                    </div>
                    <div className="flex items-center gap-3">
                        <Button type="button" variant="outline" asChild>
                            <Link href="/admin/events">Cancel</Link>
                        </Button>
                        <Button type="button" variant="destructive" onClick={() => setConfirmDelete(true)}>Delete</Button>
                        <Button type="submit" disabled={processing}>{processing ? 'Saving...' : 'Save Changes'}</Button>
                    </div>
                </div>

                <div className="grid grid-cols-1 gap-6 lg:grid-cols-[1fr_320px]">
                    <div className="space-y-6">
                        <div className="rounded-xl border border-border bg-card p-6 space-y-4">
                            <div className="space-y-1.5">
                                <Label htmlFor="title">Title *</Label>
                                <Input id="title" value={data.title} onChange={(e) => setData('title', e.target.value)} required />
                                {errors.title && <p className="text-xs text-destructive">{errors.title}</p>}
                            </div>
                            <div className="space-y-1.5">
                                <Label>Description</Label>
                                <RichText value={data.description} onChange={(v) => setData('description', v)} height={300} />
                                {errors.description && <p className="text-xs text-destructive">{errors.description}</p>}
                            </div>
                        </div>
                    </div>

                    <div className="space-y-6">
                        <div className="rounded-xl border border-border bg-card p-6 space-y-4">
                            <div className="space-y-1.5">
                                <Label htmlFor="type">Type</Label>
                                <Select value={data.type} onValueChange={(v) => setData('type', v)}>
                                    <SelectTrigger><SelectValue /></SelectTrigger>
                                    <SelectContent>
                                        <SelectItem value="conference">Conference</SelectItem>
                                        <SelectItem value="workshop">Workshop</SelectItem>
                                        <SelectItem value="seminar">Seminar</SelectItem>
                                        <SelectItem value="webinar">Webinar</SelectItem>
                                        <SelectItem value="other">Other</SelectItem>
                                    </SelectContent>
                                </Select>
                            </div>
                            <div className="space-y-1.5">
                                <Label htmlFor="status">Status</Label>
                                <Select value={data.status} onValueChange={(v) => setData('status', v)}>
                                    <SelectTrigger><SelectValue /></SelectTrigger>
                                    <SelectContent>
                                        <SelectItem value="draft">Draft</SelectItem>
                                        <SelectItem value="upcoming">Upcoming</SelectItem>
                                        <SelectItem value="ongoing">Ongoing</SelectItem>
                                        <SelectItem value="completed">Completed</SelectItem>
                                        <SelectItem value="cancelled">Cancelled</SelectItem>
                                    </SelectContent>
                                </Select>
                            </div>
                            <div className="space-y-1.5">
                                <Label>Start Date *</Label>
                                <DatePicker value={data.starts_at} onChange={(v) => setData('starts_at', v)} />
                                {errors.starts_at && <p className="text-xs text-destructive">{errors.starts_at}</p>}
                            </div>
                            <div className="space-y-1.5">
                                <Label>End Date</Label>
                                <DatePicker value={data.ends_at} onChange={(v) => setData('ends_at', v)} />
                            </div>
                            <div className="space-y-1.5">
                                <Label htmlFor="location">Location</Label>
                                <Input id="location" value={data.location} onChange={(e) => setData('location', e.target.value)} />
                            </div>
                            <div className="space-y-1.5">
                                <Label htmlFor="max_registrations">Max Registrations</Label>
                                <Input id="max_registrations" type="number" value={data.max_registrations} onChange={(e) => setData('max_registrations', e.target.value)} />
                            </div>
                            <div className="space-y-1.5">
                                <Label>Image</Label>
                                <ImageUpload
                                    key={imageKey}
                                    currentUrl={event.image}
                                    onChange={(file) => { setData('image', file); setData('image_clear', false); }}
                                    onClear={() => { setData('image', null); setData('image_clear', true); setImageKey((k) => k + 1); }}
                                />
                            </div>
                        </div>
                    </div>
                </div>
            </form>

            <ConfirmDialog
                open={confirmDelete}
                onOpenChange={setConfirmDelete}
                title="Delete Event?"
                description="This is permanent and cannot be undone."
                confirmLabel="Delete"
                variant="danger"
                onConfirm={() => router.delete(`/admin/events/${event.id}`, { onSuccess: () => setConfirmDelete(false) })}
            />
        </>
    );
}
