"use client";

import { zodResolver } from "@hookform/resolvers/zod";
import { Image as ImageIcon, Loader2, LogIn, Upload, X } from "lucide-react";
import NextImage from "next/image";
import Link from "next/link";
import { useRouter } from "next/navigation";
import * as React from "react";
import { useForm } from "react-hook-form";
import { toast } from "sonner";
import * as z from "zod";
import { Button } from "@/components/ui/button";
import {
	Card,
	CardContent,
	CardDescription,
	CardHeader,
	CardTitle,
} from "@/components/ui/card";
import {
	Form,
	FormControl,
	FormDescription,
	FormField,
	FormItem,
	FormLabel,
	FormMessage,
} from "@/components/ui/form";
import { Input } from "@/components/ui/input";
import {
	Select,
	SelectContent,
	SelectItem,
	SelectTrigger,
	SelectValue,
} from "@/components/ui/select";
import { Spinner } from "@/components/ui/spinner";
import { useAuth } from "@/providers/auth-provider";
import { CategoryService } from "@/services/category.service";
import { ContentService } from "@/services/content.service";
import type { Category } from "@/types/content";

const uploadSchema = z.object({
	title: z.string().min(3, "Le titre doit faire au moins 3 caractères"),
	type: z.enum(["meme", "gif"]),
	categoryId: z.string().optional(),
	tags: z.string().optional(),
});

type UploadFormValues = z.infer<typeof uploadSchema>;

export default function UploadPage() {
	const router = useRouter();
	const { isAuthenticated, isLoading } = useAuth();
	const [categories, setCategories] = React.useState<Category[]>([]);
	const [file, setFile] = React.useState<File | null>(null);
	const [preview, setPreview] = React.useState<string | null>(null);
	const [isUploading, setIsUploading] = React.useState(false);

	const form = useForm<UploadFormValues>({
		resolver: zodResolver(uploadSchema),
		defaultValues: {
			title: "",
			type: "meme",
			tags: "",
		},
	});

	React.useEffect(() => {
		if (isAuthenticated) {
			CategoryService.getAll().then(setCategories).catch(console.error);
		}
	}, [isAuthenticated]);

	if (isLoading) {
		return (
			<div className="flex h-[400px] items-center justify-center">
				<Spinner className="h-8 w-8 text-primary" />
			</div>
		);
	}

	if (!isAuthenticated) {
		return (
			<div className="max-w-2xl mx-auto py-8 px-4">
				<Card className="text-center p-12">
					<CardHeader>
						<div className="mx-auto bg-primary/10 p-4 rounded-full w-fit mb-4">
							<LogIn className="h-8 w-8 text-primary" />
						</div>
						<CardTitle>Connexion requise</CardTitle>
						<CardDescription>
							Vous devez être connecté pour partager vos meilleurs mèmes avec la
							communauté.
						</CardDescription>
					</CardHeader>
					<CardContent>
						<Button asChild className="w-full sm:w-auto">
							<Link href="/login">Se connecter</Link>
						</Button>
					</CardContent>
				</Card>
			</div>
		);
	}

	const handleFileChange = (e: React.ChangeEvent<HTMLInputElement>) => {
		const selectedFile = e.target.files?.[0];
		if (selectedFile) {
			if (selectedFile.size > 10 * 1024 * 1024) {
				toast.error("Le fichier est trop volumineux (max 10Mo)");
				return;
			}
			setFile(selectedFile);
			const reader = new FileReader();
			reader.onloadend = () => {
				setPreview(reader.result as string);
			};
			reader.readAsDataURL(selectedFile);
		}
	};

	const onSubmit = async (values: UploadFormValues) => {
		if (!file) {
			toast.error("Veuillez sélectionner un fichier");
			return;
		}

		setIsUploading(true);
		try {
			const formData = new FormData();
			formData.append("file", file);
			formData.append("title", values.title);
			formData.append("type", values.type);
			if (values.categoryId) formData.append("categoryId", values.categoryId);
			if (values.tags) {
				const tagsArray = values.tags
					.split(",")
					.map((t) => t.trim())
					.filter((t) => t !== "");
				for (const tag of tagsArray) {
					formData.append("tags[]", tag);
				}
			}

			await ContentService.upload(formData);
			toast.success("Mème uploadé avec succès !");
			router.push("/");
		} catch (error: unknown) {
			console.error("Upload failed:", error);
			let errorMessage = "Échec de l'upload. Êtes-vous connecté ?";
			if (
				error &&
				typeof error === "object" &&
				"response" in error &&
				error.response &&
				typeof error.response === "object" &&
				"data" in error.response &&
				error.response.data &&
				typeof error.response.data === "object" &&
				"message" in error.response.data &&
				typeof error.response.data.message === "string"
			) {
				errorMessage = error.response.data.message;
			}
			toast.error(errorMessage);
		} finally {
			setIsUploading(false);
		}
	};

	return (
		<div className="max-w-2xl mx-auto py-8 px-4">
			<Card>
				<CardHeader>
					<CardTitle className="flex items-center gap-2">
						<Upload className="h-5 w-5" />
						Partager un mème
					</CardTitle>
				</CardHeader>
				<CardContent>
					<Form {...form}>
						<form onSubmit={form.handleSubmit(onSubmit)} className="space-y-6">
							<div className="space-y-4">
								<FormLabel>Fichier (Image ou GIF)</FormLabel>
								{!preview ? (
									<button
										type="button"
										className="w-full border-2 border-dashed rounded-lg p-12 flex flex-col items-center justify-center bg-zinc-50 dark:bg-zinc-900 cursor-pointer hover:bg-zinc-100 dark:hover:bg-zinc-800 transition-colors"
										onClick={() => document.getElementById("file-upload")?.click()}
									>
										<div className="bg-primary/10 p-4 rounded-full mb-4">
											<ImageIcon className="h-8 w-8 text-primary" />
										</div>
										<p className="font-medium">Cliquez pour choisir un fichier</p>
										<p className="text-xs text-muted-foreground mt-1">
											PNG, JPG ou GIF jusqu'à 10Mo
										</p>
										<input
											id="file-upload"
											type="file"
											className="hidden"
											accept="image/*,.gif"
											onChange={handleFileChange}
										/>
									</button>
								) : (
									<div className="relative rounded-lg overflow-hidden border bg-zinc-100 dark:bg-zinc-800">
										<div className="relative h-[400px] w-full">
											<NextImage
												src={preview}
												alt="Preview"
												fill
												className="object-contain"
											/>
										</div>
										<Button
											type="button"
											variant="destructive"
											size="icon"
											className="absolute top-2 right-2 rounded-full z-10"
											onClick={() => {
												setFile(null);
												setPreview(null);
											}}
										>
											<X className="h-4 w-4" />
										</Button>
									</div>
								)}
							</div>

							<FormField
								control={form.control}
								name="title"
								render={({ field }) => (
									<FormItem>
										<FormLabel>Titre</FormLabel>
										<FormControl>
											<Input placeholder="Un titre génial pour votre mème..." {...field} />
										</FormControl>
										<FormMessage />
									</FormItem>
								)}
							/>

							<div className="grid grid-cols-1 md:grid-cols-2 gap-4">
								<FormField
									control={form.control}
									name="type"
									render={({ field }) => (
										<FormItem>
											<FormLabel>Format</FormLabel>
											<Select onValueChange={field.onChange} defaultValue={field.value}>
												<FormControl>
													<SelectTrigger>
														<SelectValue placeholder="Sélectionnez un format" />
													</SelectTrigger>
												</FormControl>
												<SelectContent>
													<SelectItem value="meme">Image fixe</SelectItem>
													<SelectItem value="gif">GIF Animé</SelectItem>
												</SelectContent>
											</Select>
											<FormMessage />
										</FormItem>
									)}
								/>

								<FormField
									control={form.control}
									name="categoryId"
									render={({ field }) => (
										<FormItem>
											<FormLabel>Catégorie</FormLabel>
											<Select onValueChange={field.onChange} defaultValue={field.value}>
												<FormControl>
													<SelectTrigger>
														<SelectValue placeholder="Sélectionnez une catégorie" />
													</SelectTrigger>
												</FormControl>
												<SelectContent>
													{categories.map((cat) => (
														<SelectItem key={cat.id} value={cat.id}>
															{cat.name}
														</SelectItem>
													))}
												</SelectContent>
											</Select>
											<FormMessage />
										</FormItem>
									)}
								/>
							</div>

							<FormField
								control={form.control}
								name="tags"
								render={({ field }) => (
									<FormItem>
										<FormLabel>Tags</FormLabel>
										<FormControl>
											<Input placeholder="funny, coding, goat..." {...field} />
										</FormControl>
										<FormDescription>Séparez les tags par des virgules.</FormDescription>
										<FormMessage />
									</FormItem>
								)}
							/>

							<Button type="submit" className="w-full" disabled={isUploading}>
								{isUploading ? (
									<>
										<Loader2 className="mr-2 h-4 w-4 animate-spin" />
										Upload en cours...
									</>
								) : (
									"Publier le mème"
								)}
							</Button>
						</form>
					</Form>
				</CardContent>
			</Card>
		</div>
	);
}