import type { Metadata } from 'next';
import type { BlogPost } from './types';
import { blogPosts } from './blog-posts';

export const getAllPosts = (): BlogPost[] => blogPosts;

export const getPostBySlug = (slug: string): BlogPost | undefined =>
  blogPosts.find((p) => p.slug === slug);

export const getPostsBySlugs = (slugs: string[]): BlogPost[] =>
  slugs
    .map((slug) => getPostBySlug(slug))
    .filter((post): post is BlogPost => post !== undefined);

export const generatePostMetadata = (post: BlogPost): Metadata => ({
  title: `${post.title} | Banatie Blog`,
  description: post.description,
  robots: 'index, follow',

  alternates: {
    canonical: `/blog/${post.slug}/`,
    languages: {
      en: `/blog/${post.slug}/`,
      'x-default': `/blog/${post.slug}/`,
    },
  },

  openGraph: {
    type: 'article',
    url: `/blog/${post.slug}/`,
    title: post.title,
    description: post.description,
    siteName: 'Banatie',
    locale: 'en_US',
    images: [
      {
        url: post.heroImage,
        width: 1200,
        height: 630,
        alt: post.title,
      },
    ],
    publishedTime: post.date,
    authors: [post.author.name],
  },

  twitter: {
    card: 'summary_large_image',
    site: '@BanatieApp',
    creator: '@BanatieApp',
    title: post.title,
    description: post.description,
    images: [post.heroImage],
  },
});

export const formatDate = (dateString: string): string => {
  const date = new Date(dateString);
  return date.toLocaleDateString('en-US', {
    year: 'numeric',
    month: 'long',
    day: 'numeric',
  });
};

export const getCategories = (): Record<string, number> => {
  return blogPosts.reduce(
    (acc, post) => {
      acc[post.category] = (acc[post.category] || 0) + 1;
      return acc;
    },
    {} as Record<string, number>
  );
};