import React, { useState, useEffect, useCallback } from "react";
import axios from "axios";
import { InputText } from "primereact/inputtext";
import { InputTextarea } from "primereact/inputtextarea";
import { InputNumber } from "primereact/inputnumber";
import { InputSwitch } from "primereact/inputswitch";
import GenericButton from "@/components/buttons/GenericButton";
import { useRouter } from "next/router";
import { useSession } from "next-auth/react";
import { useToast } from "@/hooks/useToast";
import dynamic from 'next/dynamic';
import { Tooltip } from 'primereact/tooltip';

const MDEditor = dynamic(() => import("@uiw/react-md-editor"), { ssr: false });

const EditDraftDocumentForm = ({ draft }) => {
    const [title, setTitle] = useState(draft?.title || '');
    const [summary, setSummary] = useState(draft?.summary || '');
    const [isPaidResource, setIsPaidResource] = useState(draft?.price ? true : false);
    const [price, setPrice] = useState(draft?.price || 0);
    const [coverImage, setCoverImage] = useState(draft?.image || '');
    const [topics, setTopics] = useState(draft?.topics || ['']);
    const [content, setContent] = useState(draft?.content || '');
    const [user, setUser] = useState(null);
    const [additionalLinks, setAdditionalLinks] = useState(draft?.additionalLinks || ['']);

    const { data: session } = useSession();
    const { showToast } = useToast();
    const router = useRouter();

    useEffect(() => {
        if (session) {
            setUser(session.user);
        }
    }, [session]);

    const handleContentChange = useCallback((value) => {
        setContent(value || '');
    }, []);

    const handleSubmit = async (e) => {
        e.preventDefault();

        try {
            const userResponse = await axios.get(`/api/users/${user.pubkey}`);
            if (!userResponse.data) {
                showToast('error', 'Error', 'User not found', 'Please try again.');
                return;
            }

            const payload = {
                title,
                summary,
                type: 'document',
                price: isPaidResource ? price : null,
                content,
                image: coverImage,
                topics: [...new Set([...topics.map(topic => topic.trim().toLowerCase()), 'document'])],
                additionalLinks: additionalLinks.filter(link => link.trim() !== '')
            };

            const response = await axios.put(`/api/drafts/${draft.id}`, payload);

            if (response.status === 200) {
                showToast('success', 'Success', 'Document updated successfully.');
                if (response.data?.id) {
                    router.push(`/draft/${response.data.id}`);
                }
            }
        } catch (error) {
            console.error(error);
            showToast('error', 'Error', 'Failed to update document. Please try again.');
        }
    };

    const handleTopicChange = (index, value) => {
        const updatedTopics = topics.map((topic, i) => i === index ? value : topic);
        setTopics(updatedTopics);
    };

    const addTopic = (e) => {
        e.preventDefault();
        setTopics([...topics, '']);
    };

    const removeTopic = (e, index) => {
        e.preventDefault();
        const updatedTopics = topics.filter((_, i) => i !== index);
        setTopics(updatedTopics);
    };

    const handleLinkChange = (index, value) => {
        const updatedLinks = additionalLinks.map((link, i) => i === index ? value : link);
        setAdditionalLinks(updatedLinks);
    };

    const addLink = (e) => {
        e.preventDefault();
        setAdditionalLinks([...additionalLinks, '']);
    };

    const removeLink = (e, index) => {
        e.preventDefault();
        const updatedLinks = additionalLinks.filter((_, i) => i !== index);
        setAdditionalLinks(updatedLinks);
    };

    return (
        <form onSubmit={handleSubmit}>
            <div className="p-inputgroup flex-1">
                <InputText value={title} onChange={(e) => setTitle(e.target.value)} placeholder="Title" />
            </div>
            <div className="p-inputgroup flex-1 mt-4">
                <InputTextarea value={summary} onChange={(e) => setSummary(e.target.value)} placeholder="Summary" rows={5} cols={30} />
            </div>

            <div className="p-inputgroup flex-1 mt-4 flex-col">
                <p className="py-2">Paid Document</p>
                <InputSwitch checked={isPaidResource} onChange={(e) => setIsPaidResource(e.value)} />
                {isPaidResource && (
                    <div className="p-inputgroup flex-1 py-4">
                        <i className="pi pi-bolt p-inputgroup-addon text-2xl text-yellow-500"></i>
                        <InputNumber value={price} onValueChange={(e) => setPrice(e.value)} placeholder="Price (sats)" />
                    </div>
                )}
            </div>
            <div className="p-inputgroup flex-1 mt-4">
                <InputText value={coverImage} onChange={(e) => setCoverImage(e.target.value)} placeholder="Cover Image URL" />
            </div>
            <div className="p-inputgroup flex-1 flex-col mt-4">
                <span>Content</span>
                <div data-color-mode="dark">
                    <MDEditor
                        value={content}
                        onChange={handleContentChange}
                        height={350}
                    />
                </div>
            </div>
            <div className="mt-8 flex-col w-full">
                <span className="pl-1 flex items-center">
                    External Links
                    <i className="pi pi-info-circle ml-2 cursor-pointer" 
                       data-pr-tooltip="Add any relevant external links that pair with this content (these links are currently not encrypted for 'paid' content)"
                       data-pr-position="right"
                       data-pr-at="right+5 top"
                       data-pr-my="left center-2"
                       style={{ fontSize: '1rem', color: 'var(--primary-color)' }}
                    />
                </span>
                {additionalLinks.map((link, index) => (
                    <div className="p-inputgroup flex-1" key={index}>
                        <InputText value={link} onChange={(e) => handleLinkChange(index, e.target.value)} placeholder="https://example.com" className="w-full mt-2" />
                        {index > 0 && (
                            <GenericButton icon="pi pi-times" className="p-button-danger mt-2" onClick={(e) => removeLink(e, index)} />
                        )}
                    </div>
                ))}
                <div className="w-full flex flex-row items-end justify-end py-2">
                    <GenericButton icon="pi pi-plus" onClick={addLink} />
                </div>
                <Tooltip target=".pi-info-circle" />
            </div>
            <div className="mt-4 flex-col w-full">
                {topics.map((topic, index) => (
                    <div className="p-inputgroup flex-1" key={index}>
                        <InputText value={topic} onChange={(e) => handleTopicChange(index, e.target.value)} placeholder="Topic" className="w-full mt-2" />
                        {index > 0 && (
                            <GenericButton icon="pi pi-times" className="p-button-danger mt-2" onClick={(e) => removeTopic(e, index)} />
                        )}
                    </div>
                ))}
                <div className="w-full flex flex-row items-end justify-end py-2">
                    <GenericButton icon="pi pi-plus" onClick={addTopic} />
                </div>
            </div>
            <div className="flex justify-center mt-8">
                <GenericButton type="submit" severity="success" outlined label="Update" />
            </div>
        </form>
    );
};

export default EditDraftDocumentForm;