import * as React from "react";

import { Button } from "@/components/ui/button";

import {

	Dialog,

	DialogClose,

	DialogContent,

	DialogDescription,

	DialogFooter,

	DialogHeader,

	DialogTitle,

} from "@/components/ui/dialog";

import { Input } from "@/components/ui/input";

import { Label } from "@/components/ui/label";

import {

	Select,

	SelectContent,

	SelectItem,

	SelectTrigger,

	SelectValue,

} from "@/components/ui/select";

import { toast } from "sonner";

import { useEvolu } from "@/lib/evolu";

import {

	fetchFeedWithFallback,

	parseFeedXml,

	discoverFeed,

	extractPostContent,

	extractPostDate,

	sanitizeFeedData,

	sanitizePostData,

	isYouTubeUrl,

	convertYouTubeUrlToFeed,

} from "@/lib/feed-operations";

import { formatTypeError } from "@/lib/format-error";

interface AddFeedDialogProps {

	open: boolean;

	onOpenChange: (open: boolean) => void;

	existingCategories: string[];

}

export function AddFeedDialog({

	open,

	onOpenChange,

	existingCategories,

}: AddFeedDialogProps) {

	const [urlInput, setUrlInput] = React.useState("");

	const [mode, setMode] = React.useState<"existing" | "new">("existing");

	const [selectedCategory, setSelectedCategory] = React.useState<string>("");

	const [newCategory, setNewCategory] = React.useState("");

	const [isAddingFeed, setIsAddingFeed] = React.useState(false);

	const [statusMessage, setStatusMessage] = React.useState("");

	const evolu = useEvolu();

	React.useEffect(() => {

		if (open) {

			setUrlInput("");

			setMode("existing");

			setSelectedCategory("");

			setNewCategory("");

			setStatusMessage("");

		}

	}, [open]);

	async function addFeed() {

		if (!urlInput.trim()) {

			setStatusMessage("Please enter a URL");

			return;

		}

		setIsAddingFeed(true);

		setStatusMessage("");

		try {

			let feedUrl = urlInput;

			let xmlData: string | null = null;

			// Check if it's a YouTube URL and convert it

			if (isYouTubeUrl(urlInput)) {

				setStatusMessage("Detecting YouTube channel...");

				const youtubeFeedUrl = await convertYouTubeUrlToFeed(urlInput);

				if (!youtubeFeedUrl) {

					setStatusMessage(

						"Could not extract YouTube channel ID. Please try a direct channel URL.",

					);

					setIsAddingFeed(false);

					return;

				}

				feedUrl = youtubeFeedUrl;

				xmlData = await fetchFeedWithFallback(feedUrl);

			} else {

				// First, try to fetch the URL directly as a feed

				setStatusMessage("Checking URL...");

				try {

					if (urlInput.includes("substack.com")) {

						const parts = urlInput.split("/");

						console.log(parts);

						const newUrl = `https://${parts[3].slice(1)}.${parts[2]}/feed`;

						console.log(newUrl);

						xmlData = await fetchFeedWithFallback(newUrl);

						// Try to parse it to see if it's a valid feed

						parseFeedXml(xmlData);

						// If parsing succeeds, it's a valid feed

						feedUrl = urlInput;

					} else {

						xmlData = await fetchFeedWithFallback(urlInput);

						// Try to parse it to see if it's a valid feed

						parseFeedXml(xmlData);

						// If parsing succeeds, it's a valid feed

						feedUrl = urlInput;

					}

				} catch {

					// If direct fetch/parse fails, try feed discovery

					setStatusMessage("Discovering RSS feed...");

					const discovered = await discoverFeed(urlInput);

					if (!discovered) {

						setStatusMessage(

							"Could not find an RSS feed at this URL. Please enter a direct feed URL.",

						);

						setIsAddingFeed(false);

						return;

					}

					feedUrl = discovered.feedUrl;

					xmlData = discovered.xmlData;

				}

			}

			const { feedData, posts, isAtom } = parseFeedXml(xmlData);

			// Sanitize feed data to meet schema constraints

			const sanitizedFeed = sanitizeFeedData(feedData);

			// Determine the final category value

			let finalCategory: string | null = null;

			if (mode === "new") {

				finalCategory = newCategory.trim() || null;

			} else {

				if (selectedCategory && selectedCategory !== "uncategorized") {

					finalCategory = selectedCategory;

				}

			}

			const result = evolu.insert("rssFeed", {

				feedUrl: feedUrl,

				title: sanitizedFeed.title,

				description: sanitizedFeed.description || null,

				category: finalCategory as any,

				dateUpdated: new Date().toISOString(),

			});

			if (!result.ok) {

				throw new Error(formatTypeError(result.error));

			}

			// Process posts/entries

			for (const post of posts) {

				// Sanitize post data to meet schema constraints

				const sanitizedPost = sanitizePostData(post, isAtom, feedData.title);

				const postResult = evolu.insert("rssPost", {

					title: sanitizedPost.title,

					author: sanitizedPost.author || null,

					feedTitle: sanitizedFeed.title,

					publishedDate: extractPostDate(post, isAtom),

					link: sanitizedPost.link,

					feedId: result.value.id,

					content: extractPostContent(post, sanitizedPost.link),

				});

				if (!postResult.ok) {

					console.warn(

						"Failed to insert post:",

						formatTypeError(postResult.error),

					);

				}

			}

			toast.success(

				`Successfully added "${sanitizedFeed.title}" with ${posts.length} post${posts.length !== 1 ? "s" : ""}`,

			);

			onOpenChange(false);

		} catch (error) {

			setStatusMessage(

				error instanceof Error

					? error.message

					: "Failed to add feed. Please check the URL and try again.",

			);

		} finally {

			setIsAddingFeed(false);

		}

	}

	return (

		<Dialog open={open} onOpenChange={onOpenChange}>

			<DialogContent className="sm:max-w-[425px]">

				<DialogHeader>

					<DialogTitle>Add Feed</DialogTitle>

					<DialogDescription>

						Enter a website URL or direct RSS feed URL

					</DialogDescription>

				</DialogHeader>

				<div className="grid gap-4">

					<div className="grid gap-3">

						<Label htmlFor="url-input">URL</Label>

						<Input

							id="url-input"

							name="url"

							value={urlInput}

							onChange={(e) => setUrlInput(e.target.value)}

							placeholder="https://example.com"

							disabled={isAddingFeed}

						/>

						<p className="text-xs text-muted-foreground">

							We'll automatically discover the RSS feed for you

						</p>

					</div>

					<div className="grid gap-3">

						<Label>Category</Label>

						<div className="flex gap-2">

							<Button

								type="button"

								variant={mode === "existing" ? "default" : "outline"}

								onClick={() => setMode("existing")}

								className="flex-1"

								disabled={isAddingFeed}

							>

								Existing

							</Button>

							<Button

								type="button"

								variant={mode === "new" ? "default" : "outline"}

								onClick={() => setMode("new")}

								className="flex-1"

								disabled={isAddingFeed}

							>

								New

							</Button>

						</div>

					</div>

					{mode === "existing" ? (

						<div className="grid gap-2">

							<Label htmlFor="category-select">Select Category</Label>

							<Select

								value={selectedCategory}

								onValueChange={setSelectedCategory}

								disabled={isAddingFeed}

							>

								<SelectTrigger id="category-select">

									<SelectValue placeholder="Select a category" />

								</SelectTrigger>

								<SelectContent>

									<SelectItem value="uncategorized">Uncategorized</SelectItem>

									{existingCategories.map((cat) => (

										<SelectItem key={cat} value={cat}>

											{cat}

										</SelectItem>

									))}

								</SelectContent>

							</Select>

						</div>

					) : (

						<div className="grid gap-2">

							<Label htmlFor="new-category">New Category Name</Label>

							<Input

								id="new-category"

								value={newCategory}

								onChange={(e) => setNewCategory(e.target.value)}

								placeholder="Enter category name"

								maxLength={50}

								disabled={isAddingFeed}

							/>

						</div>

					)}

					{statusMessage && (

						<div className="text-sm text-primary">{statusMessage}</div>

					)}

				</div>

				<DialogFooter>

					<DialogClose asChild>

						<Button variant="outline" disabled={isAddingFeed}>

							Cancel

						</Button>

					</DialogClose>

					<Button onClick={addFeed} type="submit" disabled={isAddingFeed}>

						{isAddingFeed ? "Adding..." : "Submit"}

					</Button>

				</DialogFooter>

			</DialogContent>

		</Dialog>

	);

}