import { NextPage } from "next";
import { NextSeo } from "next-seo";
import { useRouter } from "next/router";

import { FormEvent, useCallback, useState } from "react";

import axios from "axios";

import { User } from "@prisma/client";

import { Post } from "@models/post";
import { Response } from "@models/response";

import { parseUserInputError } from "@utils/errors";
import { parseAxiosError, parseAxiosResponse } from "@utils/fetch";
import { withSessionSsr } from "@utils/session";

import EmptyPage from "@components/EmptyPage";
import Layout from "@components/Layout";

const NewPostPage: NextPage<{ user: User }> = ({ user }) => {
	const [title, setTitle] = useState("");
	const [tags, setTags] = useState("");
	const [content, setContent] = useState("");
	const [publish, setPublish] = useState(false);

	const [error, setError] = useState<string | null>(null);

	const router = useRouter();

	const createPost = useCallback(
		async (e: FormEvent) => {
			e.preventDefault();

			const parseUserInputResult = Post.safeParse({
				title,
				tags,
				content,
				publish
			});

			if (!parseUserInputResult.success) {
				setError(parseUserInputError(parseUserInputResult.error.message));
				return;
			}

			const response: Response = await axios
				.post("/api/blog/new", parseUserInputResult.data)
				.then(parseAxiosResponse)
				.catch(parseAxiosError);

			if (response.ok) {
				router.push("/blog");
			} else {
				setError(JSON.stringify(response.error));
			}
		},
		[title, tags, content, publish, router]
	);

	return (
		<Layout>
			<NextSeo title="New post" />
			<EmptyPage>
				<div className="columns">
					<div className="column col-8 col-md-12 col-mx-auto">
						<h2>Create new post</h2>
						<h5>Logged in as {user.name}</h5>
						<form onSubmit={createPost}>
							<div className="form-group">
								<label className="form-label" htmlFor="title">
									Post title
								</label>
								<input
									value={title}
									onChange={(e) => setTitle(e.target.value)}
									required
									className="form-input"
									name="title"
									type="text"
									id="title"
									placeholder="Title"
								/>

								<label className="form-label" htmlFor="tags">
									Tags
								</label>
								<input
									value={tags}
									onChange={(e) => setTags(e.target.value)}
									required
									className="form-input"
									name="tags"
									type="text"
									id="tags"
									placeholder="A space seperated list of tags"
								/>

								<label className="form-label" htmlFor="content">
									Content
								</label>
								<textarea
									value={content}
									onChange={(e) => setContent(e.target.value)}
									style={{ resize: "none" }}
									placeholder="Some content"
									required
									className="form-input"
									name="content"
									id="content"
									minLength={100}
									cols={30}
									rows={10}
								/>

								<label className="form-checkbox">
									<input
										checked={publish}
										onChange={() => setPublish((state) => !state)}
										name="published"
										type="checkbox"
									/>
									<i className="form-icon" /> Publish
								</label>

								{error !== null && (
									<div className="toast toast-error my-2">
										<button
											className="btn btn-clear float-right"
											onClick={() => setError(null)}
										/>
										{error}
									</div>
								)}

								<input
									className={"btn btn-primary"}
									type="submit"
									value="Create post"
								/>
							</div>
						</form>
					</div>
				</div>
			</EmptyPage>
		</Layout>
	);
};

export const getServerSideProps = withSessionSsr(({ req }) => {
	const user = req.session.user;

	if (user === undefined) {
		return {
			notFound: true
		};
	}

	return {
		props: {
			user: req.session.user
		}
	};
});

export default NewPostPage;