import { httpRouter } from "convex/server";
import { httpAction } from "./_generated/server";
import { api } from "./_generated/api";
import { rssFeed, rssFullFeed } from "./rss";

const http = httpRouter();

// Site configuration
const SITE_URL = process.env.SITE_URL || "https://your-blog.netlify.app";
const SITE_NAME = "Wayne Sutton";

// RSS feed endpoint (descriptions only)
http.route({
  path: "/rss.xml",
  method: "GET",
  handler: rssFeed,
});

// Full RSS feed endpoint (with complete content for LLMs)
http.route({
  path: "/rss-full.xml",
  method: "GET",
  handler: rssFullFeed,
});

// Sitemap.xml endpoint for search engines
http.route({
  path: "/sitemap.xml",
  method: "GET",
  handler: httpAction(async (ctx) => {
    const posts = await ctx.runQuery(api.posts.getAllPosts);

    const urls = [
      // Homepage
      `  <url>
    <loc>${SITE_URL}/</loc>
    <changefreq>daily</changefreq>
    <priority>1.0</priority>
  </url>`,
      // All posts
      ...posts.map(
        (post) => `  <url>
    <loc>${SITE_URL}/${post.slug}</loc>
    <lastmod>${post.date}</lastmod>
    <changefreq>monthly</changefreq>
    <priority>0.8</priority>
  </url>`,
      ),
    ];

    const xml = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${urls.join("\n")}
</urlset>`;

    return new Response(xml, {
      headers: {
        "Content-Type": "application/xml; charset=utf-8",
        "Cache-Control": "public, max-age=3600, s-maxage=7200",
      },
    });
  }),
});

// API endpoint: List all posts (JSON for LLMs/agents)
http.route({
  path: "/api/posts",
  method: "GET",
  handler: httpAction(async (ctx) => {
    const posts = await ctx.runQuery(api.posts.getAllPosts);

    const response = {
      site: SITE_NAME,
      url: SITE_URL,
      description: "Developer and writer. Building with Convex and AI.",
      posts: posts.map((post) => ({
        title: post.title,
        slug: post.slug,
        description: post.description,
        date: post.date,
        readTime: post.readTime,
        tags: post.tags,
        url: `${SITE_URL}/${post.slug}`,
        markdownUrl: `${SITE_URL}/api/post?slug=${post.slug}`,
      })),
    };

    return new Response(JSON.stringify(response, null, 2), {
      headers: {
        "Content-Type": "application/json; charset=utf-8",
        "Cache-Control": "public, max-age=300, s-maxage=600",
        "Access-Control-Allow-Origin": "*",
      },
    });
  }),
});

// API endpoint: Get single post as markdown (for LLMs/agents)
http.route({
  path: "/api/post",
  method: "GET",
  handler: httpAction(async (ctx, request) => {
    const url = new URL(request.url);
    const slug = url.searchParams.get("slug");
    const format = url.searchParams.get("format") || "json";

    if (!slug) {
      return new Response(JSON.stringify({ error: "Missing slug parameter" }), {
        status: 400,
        headers: { "Content-Type": "application/json" },
      });
    }

    const post = await ctx.runQuery(api.posts.getPostBySlug, { slug });

    if (!post) {
      return new Response(JSON.stringify({ error: "Post not found" }), {
        status: 404,
        headers: { "Content-Type": "application/json" },
      });
    }

    // Return raw markdown if requested
    if (format === "markdown" || format === "md") {
      const markdown = `# ${post.title}

> ${post.description}

**Published:** ${post.date}${post.readTime ? ` | **Read time:** ${post.readTime}` : ""}
**Tags:** ${post.tags.join(", ")}
**URL:** ${SITE_URL}/${post.slug}

---

${post.content}`;

      return new Response(markdown, {
        headers: {
          "Content-Type": "text/markdown; charset=utf-8",
          "Cache-Control": "public, max-age=300, s-maxage=600",
          "Access-Control-Allow-Origin": "*",
        },
      });
    }

    // Default: JSON response
    const response = {
      title: post.title,
      slug: post.slug,
      description: post.description,
      date: post.date,
      readTime: post.readTime,
      tags: post.tags,
      url: `${SITE_URL}/${post.slug}`,
      content: post.content,
    };

    return new Response(JSON.stringify(response, null, 2), {
      headers: {
        "Content-Type": "application/json; charset=utf-8",
        "Cache-Control": "public, max-age=300, s-maxage=600",
        "Access-Control-Allow-Origin": "*",
      },
    });
  }),
});

// Escape HTML characters to prevent XSS
function escapeHtml(text: string): string {
  return text
    .replace(/&/g, "&amp;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;")
    .replace(/'/g, "&#39;");
}

// Generate Open Graph HTML for a post
function generatePostMetaHtml(post: {
  title: string;
  description: string;
  slug: string;
  date: string;
  readTime?: string;
}): string {
  const siteUrl = process.env.SITE_URL || "https://your-blog.netlify.app";
  const siteName = "Wayne Sutton";
  const defaultImage = `${siteUrl}/og-image.png`;
  const canonicalUrl = `${siteUrl}/${post.slug}`;

  const safeTitle = escapeHtml(post.title);
  const safeDescription = escapeHtml(post.description);

  return `<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  
  <!-- Basic SEO -->
  <title>${safeTitle} | ${siteName}</title>
  <meta name="description" content="${safeDescription}">
  <link rel="canonical" href="${canonicalUrl}">
  
  <!-- Open Graph -->
  <meta property="og:title" content="${safeTitle}">
  <meta property="og:description" content="${safeDescription}">
  <meta property="og:image" content="${defaultImage}">
  <meta property="og:url" content="${canonicalUrl}">
  <meta property="og:type" content="article">
  <meta property="og:site_name" content="${siteName}">
  <meta property="article:published_time" content="${post.date}">
  
  <!-- Twitter Card -->
  <meta name="twitter:card" content="summary_large_image">
  <meta name="twitter:title" content="${safeTitle}">
  <meta name="twitter:description" content="${safeDescription}">
  <meta name="twitter:image" content="${defaultImage}">
  
  <!-- Redirect to actual page after a brief delay for crawlers -->
  <script>
    setTimeout(() => {
      window.location.href = "${canonicalUrl}";
    }, 100);
  </script>
</head>
<body style="font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; max-width: 680px; margin: 50px auto; padding: 20px; color: #111;">
  <h1 style="font-size: 32px; margin-bottom: 16px;">${safeTitle}</h1>
  <p style="color: #666; margin-bottom: 24px;">${safeDescription}</p>
  <p style="font-size: 14px; color: #999;">${post.date}${post.readTime ? ` · ${post.readTime}` : ""}</p>
  <p style="margin-top: 24px;"><small>Redirecting to full article...</small></p>
</body>
</html>`;
}

// HTTP endpoint for Open Graph metadata
http.route({
  path: "/meta/post",
  method: "GET",
  handler: httpAction(async (ctx, request) => {
    const url = new URL(request.url);
    const slug = url.searchParams.get("slug");

    if (!slug) {
      return new Response("Missing slug parameter", { status: 400 });
    }

    try {
      const post = await ctx.runQuery(api.posts.getPostBySlug, { slug });

      if (!post) {
        return new Response("Post not found", { status: 404 });
      }

      const html = generatePostMetaHtml({
        title: post.title,
        description: post.description,
        slug: post.slug,
        date: post.date,
        readTime: post.readTime,
      });

      return new Response(html, {
        headers: {
          "Content-Type": "text/html; charset=utf-8",
          "Cache-Control":
            "public, max-age=60, s-maxage=300, stale-while-revalidate=600",
        },
      });
    } catch {
      return new Response("Internal server error", { status: 500 });
    }
  }),
});

export default http;