import { useState, useEffect } from 'react';
import { useNavigate } from 'react-router-dom';
import ReactMarkdown from 'react-markdown';
import remarkGfm from 'remark-gfm';
import { Skeleton } from '@/components/ui/skeleton';
import { Alert, AlertDescription } from '@/components/ui/alert';
import { AlertCircle } from 'lucide-react';
import type { DocContent as DocContentType } from './types';

interface DocContentProps {
    slug: string;
}

export default function DocContent({ slug }: DocContentProps) {
    const navigate = useNavigate();
    const [doc, setDoc] = useState<DocContentType | null>(null);
    const [loading, setLoading] = useState(true);
    const [error, setError] = useState<string | null>(null);

    useEffect(() => {
        const fetchDoc = async () => {
            setLoading(true);
            setError(null);

            try {
                const nonce = (window as any).WNW_CONFIG?.nonce || (window as any).wpApiSettings?.nonce || '';
                const response = await fetch(`/wp-json/woonoow/v1/docs/${slug}`, {
                    credentials: 'include',
                    headers: {
                        'X-WP-Nonce': nonce,
                    },
                });

                if (!response.ok) {
                    throw new Error('Document not found');
                }

                const data = await response.json();

                if (data.success) {
                    setDoc(data.doc);
                } else {
                    throw new Error(data.message || 'Failed to load document');
                }
            } catch (err) {
                setError(err instanceof Error ? err.message : 'Failed to load document');
                setDoc(null);
            } finally {
                setLoading(false);
            }
        };

        fetchDoc();
    }, [slug]);

    if (loading) {
        return (
            <div className="space-y-4">
                <Skeleton className="h-10 w-3/4" />
                <Skeleton className="h-4 w-full" />
                <Skeleton className="h-4 w-full" />
                <Skeleton className="h-4 w-2/3" />
                <Skeleton className="h-32 w-full mt-6" />
                <Skeleton className="h-4 w-full" />
                <Skeleton className="h-4 w-5/6" />
            </div>
        );
    }

    if (error) {
        return (
            <Alert variant="destructive">
                <AlertCircle className="h-4 w-4" />
                <AlertDescription>
                    {error}
                </AlertDescription>
            </Alert>
        );
    }

    if (!doc) {
        return null;
    }

    return (
        <article className="prose prose-slate dark:prose-invert max-w-none">
            <ReactMarkdown
                remarkPlugins={[remarkGfm]}
                components={{
                    // Custom heading with anchor links
                    h1: ({ children }) => (
                        <h1 className="text-3xl font-bold mb-6 pb-4 border-b">{children}</h1>
                    ),
                    h2: ({ children }) => (
                        <h2 className="text-2xl font-semibold mt-10 mb-4">{children}</h2>
                    ),
                    h3: ({ children }) => (
                        <h3 className="text-xl font-medium mt-8 mb-3">{children}</h3>
                    ),
                    // Styled tables
                    table: ({ children }) => (
                        <div className="overflow-x-auto my-6">
                            <table className="min-w-full border-collapse border border-border rounded-lg">
                                {children}
                            </table>
                        </div>
                    ),
                    th: ({ children }) => (
                        <th className="border border-border bg-muted px-4 py-2 text-left font-semibold">
                            {children}
                        </th>
                    ),
                    td: ({ children }) => (
                        <td className="border border-border px-4 py-2">{children}</td>
                    ),
                    // Styled code blocks
                    code: ({ className, children }) => {
                        const isInline = !className;
                        if (isInline) {
                            return (
                                <code className="bg-muted px-1.5 py-0.5 rounded text-sm font-mono">
                                    {children}
                                </code>
                            );
                        }
                        return (
                            <code className={className}>
                                {children}
                            </code>
                        );
                    },
                    pre: ({ children }) => (
                        <pre className="bg-muted p-4 rounded-lg overflow-x-auto my-4">
                            {children}
                        </pre>
                    ),
                    // Styled blockquotes for notes
                    blockquote: ({ children }) => (
                        <blockquote className="border-l-4 border-primary bg-primary/5 pl-4 py-2 my-4 italic">
                            {children}
                        </blockquote>
                    ),
                    // Links
                    a: ({ href, children }) => {
                        const isExternal = href?.startsWith('http') || href?.startsWith('mailto:');
                        const isAnchor = href?.startsWith('#');

                        return (
                            <a
                                href={href}
                                className="text-primary hover:underline cursor-pointer"
                                target={isExternal ? '_blank' : undefined}
                                rel={isExternal ? 'noopener noreferrer' : undefined}
                                onClick={(e) => {
                                    if (!isExternal && !isAnchor && href) {
                                        e.preventDefault();
                                        navigate(href);
                                    }
                                }}
                            >
                                {children}
                            </a>
                        );
                    },
                    // Lists
                    ul: ({ children }) => (
                        <ul className="list-disc pl-6 my-4 space-y-2">{children}</ul>
                    ),
                    ol: ({ children }) => (
                        <ol className="list-decimal pl-6 my-4 space-y-2">{children}</ol>
                    ),
                    // Horizontal rule
                    hr: () => <hr className="my-8 border-border" />,
                }}
            >
                {doc.content}
            </ReactMarkdown>
        </article>
    );
}
