---
import type { GetStaticPaths } from 'astro';
import { getCollection } from 'astro:content';
import { shouldShowPost, getPostSlug } from '@/utils/markdown';
import PostLayout from '@/layouts/PostLayout.astro';

export const getStaticPaths: GetStaticPaths = async () => {
  // Get all posts
  const posts = await getCollection('posts');

  // Filter posts for production (in dev, show all including drafts)
  const isDev = import.meta.env.DEV;
  const visiblePosts = posts.filter(post => shouldShowPost(post, isDev));

  // Generate paths for new slugs
  const paths = visiblePosts.map(post => ({
    params: { slug: getPostSlug(post) },
    props: { post, isCanonical: true }
  }));

  // Generate paths for old IDs (if different) to handle redirects
  // This prevents broken links for existing posts
  const redirectPaths = visiblePosts
    .filter(post => getPostSlug(post) !== post.id)
    .map(post => ({
      params: { slug: post.id },
      props: { post, isCanonical: false }
    }));

  return [...paths, ...redirectPaths];
};

export interface Props {
  post: any;
  isCanonical?: boolean;
}

const { post, isCanonical = true } = Astro.props;

// Perform 301 redirect if accessed via old ID-based URL
if (!isCanonical) {
  return Astro.redirect(`/posts/${getPostSlug(post)}`, 301);
}

// Validate post data
if (!post) {
  return Astro.redirect('/404');
}

// Check if post should be visible in production
const isDev = import.meta.env.DEV;
if (!shouldShowPost(post, isDev)) {
  return Astro.redirect('/404');
}
---

<PostLayout post={post} />