import {useEffect, useRef, useState} from "react";
import {useNavigate, useParams} from "react-router-dom";
import {BytescaleUploader} from "@/components/BytescaleUploader/BytescaleUploader";
import EditorJS, {OutputData} from "@editorjs/editorjs";
import Header from "@editorjs/header";
import List from "@editorjs/list";
import ImageTool from "@editorjs/image";
import Quote from "@editorjs/quote";
import Table from "@editorjs/table";
import CodeTool from "@editorjs/code";
import Embed from "@editorjs/embed";
import Delimiter from "@editorjs/delimiter";
import axios from "axios";

import {
	createBlogApi,
	updateBlogApi,
	getBlogByIdApi,
	uploadImageApi,
} from "@/api/blog";

import {Card, CardContent, CardHeader, CardTitle} from "@/components/ui/card";
import {Input} from "@/components/ui/input";
import {Button} from "@/components/ui/button";

export default function BlogEditorPage() {
	const baseURL = import.meta.env.VITE_API_URL;
	const {id} = useParams();
	const navigate = useNavigate();

	const editorRef = useRef<EditorJS | null>(null);
	const hasInitialized = useRef(false);
	const hasRenderedContent = useRef(false);

	const [title, setTitle] = useState("");
	const [writer, setWriter] = useState("");
	const [coverImage, setCoverImage] = useState("");
	const [loading, setLoading] = useState(false);

	const isEdit = Boolean(id);

	useEffect(() => {
		if (hasInitialized.current) return;
		hasInitialized.current = true;

		let editor: EditorJS;

		const initEditor = async () => {
			editor = new EditorJS({
				holder: "editorjs",

				placeholder: "Write blog content...",

				tools: {
					header: {
						class: Header,
						inlineToolbar: true,
						config: {
							placeholder: "Enter heading",
							levels: [1, 2, 3, 4],
							defaultLevel: 2,
						},
					},

					list: {
						class: List,
						inlineToolbar: true,
						config: {
							defaultStyle: "unordered",
						},
					},

					quote: Quote,
					table: Table,
					code: CodeTool,
					embed: Embed,
					delimiter: Delimiter,

					image: {
						class: ImageTool,
						config: {
							uploader: {
								uploadByFile: async (file: File) => {
									if (file.size > 5 * 1024 * 1024) {
										alert("File is too large (Max 5MB)");
										return {success: 0, file: {url: ""}};
									}

									const formData = new FormData();
									formData.append("file", file);
									formData.append("folderPath", "/blog");

									try {
										const response = await axios.post(
											`${baseURL}/upload`,
											formData,
											{
												headers: {
													"Content-Type": "multipart/form-data",
												},
											},
										);

										return {
											success: 1,
											file: {url: response.data.fileUrl},
										};
									} catch (e: any) {
										console.error("EditorJS Image Upload Error:", e);
										const errorMessage =
											e.response?.data?.error || e.message || "Upload failed";
										alert(`Upload Error: ${errorMessage}`);

										return {
											success: 0,
											file: {url: ""},
										};
									}
								},
							},
						},
					},
				},
			});

			await editor.isReady;
			editorRef.current = editor;

			if (isEdit && id && !hasRenderedContent.current) {
				try {
					const res = await getBlogByIdApi(Number(id));

					setTitle(res.title);
					setWriter(res.writer);
					setCoverImage(res.image || "");

					if (res.content) {
						await editor.blocks.clear();
						await editor.render(res.content);
						hasRenderedContent.current = true;
					}
				} catch (err) {
					console.error(err);
				}
			}
		};

		initEditor();
	}, [id, isEdit]);

	const handleSave = async () => {
		if (!editorRef.current) return;

		setLoading(true);

		try {
			const content: OutputData = await editorRef.current.save();

			const payload = {
				title,
				writer,
				image: coverImage,
				content,
				isActive: true,
			};

			if (isEdit) {
				await updateBlogApi(Number(id), payload);
			} else {
				await createBlogApi(payload);
			}

			navigate("/blog");
		} catch (err) {
			console.error(err);
		} finally {
			setLoading(false);
		}
	};

	return (
		<div className="p-6 max-w-5xl mx-auto space-y-6">
			<Card>
				<CardHeader>
					<CardTitle>{isEdit ? "Edit Blog" : "Create Blog"}</CardTitle>
				</CardHeader>

				<CardContent className="space-y-4">
					<Input
						placeholder="Blog Title"
						value={title}
						onChange={(e) => setTitle(e.target.value)}
					/>

					<Input
						placeholder="Writer Name"
						value={writer}
						onChange={(e) => setWriter(e.target.value)}
					/>

					<div className="space-y-2">
						<label className="text-sm font-medium">Cover Image</label>

						<BytescaleUploader
							value={coverImage}
							folderPath="/blog"
							onChange={(url) => setCoverImage(url)}
						/>

						{coverImage && (
							<img
								src={coverImage}
								alt="cover"
								className="w-full max-h-[250px] object-cover rounded-md"
							/>
						)}
					</div>

					<div
						id="editorjs"
						className="border rounded-md p-4 bg-white min-h-[300px]"
					/>

					<Button onClick={handleSave} disabled={loading}>
						{loading ? "Saving..." : "Save Blog"}
					</Button>
				</CardContent>
			</Card>
		</div>
	);
}