import React, { useEffect, useState } from 'react';
import axios from 'axios';
import { useRouter } from 'next/router';
import { useNostr } from '@/hooks/useNostr';
import { parseEvent, findKind0Fields, hexToNpub } from '@/utils/nostr';
import { verifyEvent, nip19, nip04 } from 'nostr-tools';
import { v4 as uuidv4 } from 'uuid';
import { useLocalStorageWithEffect } from '@/hooks/useLocalStorage';
import { useImageProxy } from '@/hooks/useImageProxy';
import { Button } from 'primereact/button';
import { useToast } from '@/hooks/useToast';
import { Tag } from 'primereact/tag';
import Image from 'next/image';
import useResponsiveImageDimensions from '@/hooks/useResponsiveImageDimensions';
import 'primeicons/primeicons.css';

import ReactMarkdown from 'react-markdown';
import rehypeRaw from 'rehype-raw';

const MarkdownContent = ({ content }) => {
    // Function to strip HTML tags
    const stripHtml = (html) => {
        let tmp = document.createElement("DIV");
        tmp.innerHTML = html;
        return tmp.textContent || tmp.innerText || "";
    };

    // Strip HTML tags from the content
    const plainContent = stripHtml(content);

    return (
        <div>
            <ReactMarkdown rehypePlugins={[rehypeRaw]} className='markdown-content'>
                {plainContent}
            </ReactMarkdown>
        </div>
    );
};

export default function Details() {
    const [draft, setDraft] = useState(null);

    const { returnImageProxy } = useImageProxy();

    const { publishCourse, publishResource, fetchSingleEvent } = useNostr();

    const [user] = useLocalStorageWithEffect('user', {});

    const { width, height } = useResponsiveImageDimensions();

    const router = useRouter();

    const { showToast } = useToast();

    useEffect(() => {
        if (router.isReady) {
            const { slug } = router.query;

            axios.get(`/api/drafts/${slug}`)
                .then(res => {
                    console.log('res:', res.data);
                    setDraft(res.data);
                })
                .catch(err => {
                    console.error(err);
                });
        }
    }, [router.isReady, router.query]);

    const handleSubmit = async () => {
        if (draft) {
            const { unsignedEvent, type } = await buildEvent(draft);

            if (unsignedEvent) {
                const published = await publishEvent(unsignedEvent, type);
                // if successful, delete the draft, redirect to profile
                if (published) {
                    axios.delete(`/api/drafts/${draft.id}`)
                        .then(res => {
                            if (res.status === 204) {
                                showToast('success', 'Success', 'Draft deleted successfully.');
                                router.push(`/profile`);
                            } else {
                                showToast('error', 'Error', 'Failed to delete draft.');
                            }
                        })
                        .catch(err => {
                            console.error(err);
                        });
                }
            } else {
                showToast('error', 'Error', 'Failed to broadcast resource. Please try again.');
            }
        }
    }

    const handleDelete = async () => {
        if (draft) {
            await axios.delete(`/api/drafts/${draft.id}`)
                .then(res => {
                    if (res.status === 204) {
                        showToast('success', 'Success', 'Draft deleted successfully.');
                        router.push(`/profile`);
                    } else {
                        showToast('error', 'Error', 'Failed to delete draft.');
                    }
                })
                .catch(err => {
                    console.error(err);
                });
        }
    }

    const publishEvent = async (event, type) => {
        const dTag = event.tags.find(tag => tag[0] === 'd')[1];

        const signedEvent = await window.nostr.signEvent(event);

        const eventVerification = await verifyEvent(signedEvent);

        if (!eventVerification) {
            showToast('error', 'Error', 'Event verification failed. Please try again.');
            return;
        }

        const nAddress = nip19.naddrEncode({
            pubkey: signedEvent.pubkey,
            kind: signedEvent.kind,
            identifier: dTag,
        })

        console.log('nAddress:', nAddress);

        const userResponse = await axios.get(`/api/users/${user.pubkey}`)

        if (!userResponse.data) {
            showToast('error', 'Error', 'User not found', 'Please try again.');
            return;
        }

        const payload = {
            id: dTag,
            userId: userResponse.data.id,
            price: draft.price || 0,
            noteId: nAddress,
        }
        const response = await axios.post(`/api/resources`, payload);

        if (response.status !== 201) {
            showToast('error', 'Error', 'Failed to create resource. Please try again.');
            return;
        }

        let published;

        if (type === 'resource' || type === 'workshop') {
            published = await publishResource(signedEvent);
        } else if (type === 'course') {
            published = await publishCourse(signedEvent);
        }

        console.log('published:', published);

        if (published) {
            // check if the event is published
            const publishedEvent = await fetchSingleEvent(signedEvent.id);

            console.log('publishedEvent:', publishedEvent);

            if (publishedEvent) {
                // show success message
                showToast('success', 'Success', `${type} published successfully.`);
                // delete the draft
                console.log('draft:', draft);
                await axios.delete(`/api/drafts/${draft.id}`)
                    .then(res => {
                        if (res.status === 204) {
                            showToast('success', 'Success', 'Draft deleted successfully.');
                            router.push(`/profile`);
                        } else {
                            showToast('error', 'Error', 'Failed to delete draft.');
                        }
                    })
                    .catch(err => {
                        console.error(err);
                    });
            }
        }
    }

    const buildEvent = async (draft) => {
        const NewDTag = uuidv4();
        let event = {};
        let type;
        let encryptedContent;

        switch (draft?.type) {
            case 'resource':
                if (draft?.price) {
                    // encrypt the content with NEXT_PUBLIC_APP_PRIV_KEY to NEXT_PUBLIC_APP_PUBLIC_KEY
                    encryptedContent = await nip04.encrypt(process.env.NEXT_PUBLIC_APP_PRIV_KEY, process.env.NEXT_PUBLIC_APP_PUBLIC_KEY, draft.content);
                }
                event = {
                    kind: draft?.price ? 30402 : 30023, // Determine kind based on if price is present
                    content: draft?.price ? encryptedContent : draft.content,
                    created_at: Math.floor(Date.now() / 1000),
                    tags: [
                        ['d', NewDTag],
                        ['title', draft.title],
                        ['summary', draft.summary],
                        ['image', draft.image],
                        ...draft.topics.map(topic => ['t', topic]),
                        ['published_at', Math.floor(Date.now() / 1000).toString()],
                        // Include price and location tags only if price is present
                        ...(draft?.price ? [['price', draft.price], ['location', `https://plebdevs.com/resource/${draft.id}`]] : []),
                    ]
                };
                type = 'resource';
                break;
            case 'workshop':
                if (draft?.price) {
                    // encrypt the content with NEXT_PUBLIC_APP_PRIV_KEY to NEXT_PUBLIC_APP_PUBLIC_KEY
                    encryptedContent = await nip04.encrypt(process.env.NEXT_PUBLIC_APP_PRIV_KEY, process.env.NEXT_PUBLIC_APP_PUBLIC_KEY, draft.content);
                }
                event = {
                    kind: draft?.price ? 30402 : 30023,
                    content: draft?.price ? encryptedContent : draft.content,
                    created_at: Math.floor(Date.now() / 1000),
                    tags: [
                        ['d', NewDTag],
                        ['title', draft.title],
                        ['summary', draft.summary],
                        ['image', draft.image],
                        ...draft.topics.map(topic => ['t', topic]),
                        ['published_at', Math.floor(Date.now() / 1000).toString()],
                    ]
                };
                type = 'workshop';
                break;
            case 'course':
                event = {
                    kind: 30023,
                    content: draft.content,
                    created_at: Math.floor(Date.now() / 1000),
                    tags: [
                        ['d', NewDTag],
                        ['title', draft.title],
                        ['summary', draft.summary],
                        ['image', draft.image],
                        ...draft.topics.map(topic => ['t', topic]),
                        ['published_at', Math.floor(Date.now() / 1000).toString()],
                    ]
                };
                type = 'course';
                break;
            default:
                event = null;
                type = 'unknown';
        }

        return { unsignedEvent: event, type };
    };

    return (
        <div className='w-full px-24 pt-12 mx-auto mt-4 max-tab:px-0 max-mob:px-0 max-tab:pt-2 max-mob:pt-2'>
            <div className='w-full flex flex-row justify-between max-tab:flex-col max-mob:flex-col'>
                {/* <i className='pi pi-arrow-left pl-8 cursor-pointer hover:opacity-75 max-tab:pl-2 max-mob:pl-2' onClick={() => router.push('/')} /> */}
                <div className='w-[75vw] mx-auto flex flex-row items-start justify-between max-tab:flex-col max-mob:flex-col max-tab:w-[95vw] max-mob:w-[95vw]'>
                    <div className='flex flex-col items-start max-w-[45vw] max-tab:max-w-[100vw] max-mob:max-w-[100vw]'>
                        <div className='pt-2 flex flex-row justify-start w-full'>
                            {/* List out topics */}
                            {draft?.topics && draft.topics.map((topic, index) => {
                                if (topic === "plebdevs") return;
                                return (
                                    <Tag className='mr-2 text-white' key={index} value={topic}></Tag>
                                )
                            })
                            }
                        </div>
                        <h1 className='text-4xl mt-6'>{draft?.title}</h1>
                        <p className='text-xl mt-6'>{draft?.summary}</p>
                        <div className='flex flex-row w-full mt-6 items-center'>
                            <Image
                                alt="resource thumbnail"
                                src={user?.avatar ? returnImageProxy(user.avatar) : `https://secure.gravatar.com/avatar/${user.pubkey}?s=90&d=identicon`}
                                width={50}
                                height={50}
                                className="rounded-full mr-4"
                            />
                            {user && user?.pubkey && (
                                <p className='text-lg'>
                                    Created by{' '}
                                    <a href={`https://nostr.com/${hexToNpub(user?.pubkey)}`} rel='noreferrer noopener' target='_blank' className='text-blue-500 hover:underline'>
                                        {user?.username || user?.pubkey.slice(0, 10)}{'... '}
                                    </a>
                                </p>
                            )}
                        </div>
                    </div>
                    <div className='flex flex-col max-tab:mt-12 max-mob:mt-12'>
                        {draft && (
                            <div style={{ width: width < 768 ? "auto" : width }} onClick={() => router.push(`/details/${draft.id}`)} className="flex flex-col items-center mx-auto cursor-pointer rounded-md shadow-lg">
                                <div style={{ maxWidth: width, minWidth: width }} className="max-tab:h-auto max-mob:h-auto">
                                    <Image
                                        alt="resource thumbnail"
                                        src={returnImageProxy(draft.image)}
                                        quality={100}
                                        width={width}
                                        height={height}
                                        className="w-full h-full object-cover object-center rounded-md"
                                    />
                                </div>
                            </div>
                        )}
                    </div>
                </div>
            </div>
            <div className='w-[75vw] mx-auto flex flex-row justify-end mt-12'>
                <div className='w-fit flex flex-row justify-between'>
                    <Button onClick={handleSubmit} label="Publish" severity='success' outlined className="w-auto m-2" />
                    <Button onClick={() => router.push(`/draft/${draft?.id}/edit`)} label="Edit" severity='warning' outlined className="w-auto m-2" />
                    <Button onClick={handleDelete} label="Delete" severity='danger' outlined className="w-auto m-2 mr-0" />
                </div>
            </div>
            <div className='w-[75vw] mx-auto mt-12 p-12 border-t-2 border-gray-300 max-tab:p-0 max-mob:p-0 max-tab:max-w-[100vw] max-mob:max-w-[100vw]'>
                {
                    draft?.content && <MarkdownContent content={draft.content} />
                }
            </div>
        </div>
    );
}