"use client";

import { IconBrandYoutube } from "@tabler/icons-react";
import { TagInput, type Tag as TagType } from "emblor";
import { Loader2 } from "lucide-react";
import { motion } from "motion/react";
import { useRouter } from "next/navigation";
import { useTranslations } from "next-intl";
import { useState } from "react";
import { toast } from "sonner";

import { Button } from "@/components/ui/button";
import {
	Card,
	CardContent,
	CardDescription,
	CardFooter,
	CardHeader,
	CardTitle,
} from "@/components/ui/card";
import { Label } from "@/components/ui/label";
import { authenticatedFetch } from "@/lib/auth-utils";

const youtubeRegex =
	/^(https:\/\/)?(www\.)?(youtube\.com\/watch\?v=|youtu\.be\/)([a-zA-Z0-9_-]{11})$/;

interface YouTubeTabProps {
	searchSpaceId: string;
}

export function YouTubeTab({ searchSpaceId }: YouTubeTabProps) {
	const t = useTranslations("add_youtube");
	const router = useRouter();
	const [videoTags, setVideoTags] = useState<TagType[]>([]);
	const [activeTagIndex, setActiveTagIndex] = useState<number | null>(null);
	const [isSubmitting, setIsSubmitting] = useState(false);
	const [error, setError] = useState<string | null>(null);

	const isValidYoutubeUrl = (url: string): boolean => {
		return youtubeRegex.test(url);
	};

	const extractVideoId = (url: string): string | null => {
		const match = url.match(/(?:youtube\.com\/watch\?v=|youtu\.be\/)([a-zA-Z0-9_-]{11})/);
		return match ? match[1] : null;
	};

	const handleSubmit = async () => {
		if (videoTags.length === 0) {
			setError(t("error_no_video"));
			return;
		}

		const invalidUrls = videoTags.filter((tag) => !isValidYoutubeUrl(tag.text));
		if (invalidUrls.length > 0) {
			setError(t("error_invalid_urls", { urls: invalidUrls.map((tag) => tag.text).join(", ") }));
			return;
		}

		setError(null);
		setIsSubmitting(true);

		try {
			toast(t("processing_toast"), {
				description: t("processing_toast_desc"),
			});

			const videoUrls = videoTags.map((tag) => tag.text);

			const response = await authenticatedFetch(
				`${process.env.NEXT_PUBLIC_FASTAPI_BACKEND_URL}/api/v1/documents`,
				{
					method: "POST",
					headers: { "Content-Type": "application/json" },
					body: JSON.stringify({
						document_type: "YOUTUBE_VIDEO",
						content: videoUrls,
						search_space_id: parseInt(searchSpaceId),
					}),
				}
			);

			if (!response.ok) {
				throw new Error("Failed to process YouTube videos");
			}

			await response.json();

			toast(t("success_toast"), {
				description: t("success_toast_desc"),
			});

			router.push(`/dashboard/${searchSpaceId}/documents`);
		} catch (error: any) {
			setError(error.message || t("error_generic"));
			toast(t("error_toast"), {
				description: `${t("error_toast_desc")}: ${error.message}`,
			});
		} finally {
			setIsSubmitting(false);
		}
	};

	const handleAddTag = (text: string) => {
		if (!isValidYoutubeUrl(text)) {
			toast(t("invalid_url_toast"), {
				description: t("invalid_url_toast_desc"),
			});
			return;
		}

		if (videoTags.some((tag) => tag.text === text)) {
			toast(t("duplicate_url_toast"), {
				description: t("duplicate_url_toast_desc"),
			});
			return;
		}

		const newTag: TagType = {
			id: Date.now().toString(),
			text: text,
		};

		setVideoTags([...videoTags, newTag]);
	};

	return (
		<motion.div
			initial={{ opacity: 0, y: 20 }}
			animate={{ opacity: 1, y: 0 }}
			transition={{ duration: 0.3 }}
			className="max-w-2xl mx-auto space-y-6"
		>
			<Card>
				<CardHeader>
					<CardTitle className="flex items-center gap-2">
						<IconBrandYoutube className="h-5 w-5" />
						{t("title")}
					</CardTitle>
					<CardDescription>{t("subtitle")}</CardDescription>
				</CardHeader>

				<CardContent>
					<div className="space-y-4">
						<div className="space-y-2">
							<Label htmlFor="video-input">{t("label")}</Label>
							<TagInput
								id="video-input"
								tags={videoTags}
								setTags={setVideoTags}
								placeholder={t("placeholder")}
								onAddTag={handleAddTag}
								styleClasses={{
									inlineTagsContainer:
										"border-input rounded-lg bg-background shadow-sm shadow-black/5 transition-shadow focus-within:border-ring focus-within:outline-none focus-within:ring-[3px] focus-within:ring-ring/20 p-1 gap-1",
									input: "w-full min-w-[80px] focus-visible:outline-none shadow-none px-2 h-7",
									tag: {
										body: "h-7 relative bg-background border border-input hover:bg-background rounded-md font-medium text-xs ps-2 pe-7 flex",
										closeButton:
											"absolute -inset-y-px -end-px p-0 rounded-e-lg flex size-7 transition-colors outline-0 focus-visible:outline focus-visible:outline-2 focus-visible:outline-ring/70 text-muted-foreground/80 hover:text-foreground",
									},
								}}
								activeTagIndex={activeTagIndex}
								setActiveTagIndex={setActiveTagIndex}
							/>
							<p className="text-xs text-muted-foreground mt-1">{t("hint")}</p>
						</div>

						{error && (
							<motion.div
								className="text-sm text-red-500 mt-2"
								initial={{ opacity: 0, scale: 0.9 }}
								animate={{ opacity: 1, scale: 1 }}
							>
								{error}
							</motion.div>
						)}

						<div className="bg-muted/50 rounded-lg p-4 text-sm">
							<h4 className="font-medium mb-2">{t("tips_title")}</h4>
							<ul className="list-disc pl-5 space-y-1 text-muted-foreground">
								<li>{t("tip_1")}</li>
								<li>{t("tip_2")}</li>
								<li>{t("tip_3")}</li>
								<li>{t("tip_4")}</li>
							</ul>
						</div>

						{videoTags.length > 0 && (
							<div className="mt-4 space-y-2">
								<h4 className="font-medium">{t("preview")}:</h4>
								<div className="grid grid-cols-1 gap-3">
									{videoTags.map((tag, index) => {
										const videoId = extractVideoId(tag.text);
										return videoId ? (
											<motion.div
												key={tag.id}
												initial={{ opacity: 0, y: 10 }}
												animate={{ opacity: 1, y: 0 }}
												transition={{ delay: index * 0.1 }}
												className="relative aspect-video rounded-lg overflow-hidden border"
											>
												<iframe
													width="100%"
													height="100%"
													src={`https://www.youtube.com/embed/${videoId}`}
													title="YouTube video player"
													allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture"
													allowFullScreen
												/>
											</motion.div>
										) : null;
									})}
								</div>
							</div>
						)}
					</div>
				</CardContent>

				<CardFooter className="flex justify-between">
					<Button
						variant="outline"
						onClick={() => router.push(`/dashboard/${searchSpaceId}/documents`)}
					>
						{t("cancel")}
					</Button>
					<Button
						onClick={handleSubmit}
						disabled={isSubmitting || videoTags.length === 0}
						className="relative overflow-hidden"
					>
						{isSubmitting ? (
							<>
								<Loader2 className="mr-2 h-4 w-4 animate-spin" />
								{t("processing")}
							</>
						) : (
							<>
								<IconBrandYoutube className="mr-2 h-4 w-4" />
								{t("submit")}
							</>
						)}
					</Button>
				</CardFooter>
			</Card>
		</motion.div>
	);
}