import path from "path";
import { fileURLToPath } from "url";
import { readFileSync } from "fs";
import { createServer } from "./index";
import * as express from "express";
import { adminSupabase } from "./supabase";

const app = createServer();
const port = process.env.PORT || 5000;
const host = "0.0.0.0";

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const distPath = path.join(__dirname, "../spa");

// Serve static files
app.use(express.static(distPath));

// ── SSR Meta Injection ────────────────────────────────────────────────────────

const BASE_URL = "https://aethex.dev";
const DEFAULT_OG_IMAGE =
  "https://docs.aethex.tech/~gitbook/image?url=https%3A%2F%2F1143808467-files.gitbook.io%2F%7E%2Ffiles%2Fv0%2Fb%2Fgitbook-x-prod.appspot.com%2Fo%2Forganizations%252FDhUg3jal6kdpG645FzIl%252Fsites%252Fsite_HeOmR%252Flogo%252FqxDYz8Oj2SnwUTa8t3UB%252FAeThex%2520Origin%2520logo.png%3Falt%3Dmedia%26token%3D200e8ea2-0129-4cbe-b516-4a53f60c512b&width=1200&dpr=1&quality=100&sign=6c7576ce&sv=2";

type RouteMeta = {
  title: string;
  description: string;
  image?: string;
  type?: string;
};

/** Static route overrides — matched in order, first match wins. */
const STATIC_META: Array<{ pattern: RegExp; meta: RouteMeta }> = [
  {
    pattern: /^\/$/,
    meta: {
      title: "AeThex | Developer Platform for Builders, Creators & Innovation",
      description:
        "AeThex: an advanced development platform and community for builders. Collaborate on projects, learn, and ship innovation.",
    },
  },
  {
    pattern: /^\/projects\/?$/,
    meta: {
      title: "AeThex | Projects",
      description:
        "Explore open-source and community projects built on the AeThex platform.",
    },
  },
  {
    pattern: /^\/projects\/new/,
    meta: {
      title: "AeThex | New Project",
      description: "Start a new project on AeThex.",
    },
  },
  {
    pattern: /^\/gameforge/,
    meta: {
      title: "AeThex | GameForge Studio",
      description:
        "GameForge — AeThex's game development studio for indie game creators. Build, manage, and ship games.",
    },
  },
  {
    pattern: /^\/ethos/,
    meta: {
      title: "AeThex | Ethos Guild",
      description:
        "Ethos Guild — collaborative music creation, licensing, and creative work on AeThex.",
    },
  },
  {
    pattern: /^\/dev-platform/,
    meta: {
      title: "AeThex | Developer Platform",
      description:
        "Build with AeThex APIs. Documentation, SDKs, examples, and developer tools for modern builders.",
    },
  },
  {
    pattern: /^\/feed/,
    meta: {
      title: "AeThex | Community Feed",
      description: "What's happening in the AeThex builder community.",
    },
  },
  {
    pattern: /^\/login/,
    meta: {
      title: "AeThex | Sign In",
      description:
        "Sign in to your AeThex account to access projects, community, and more.",
    },
  },
  {
    pattern: /^\/register/,
    meta: {
      title: "AeThex | Create Account",
      description:
        "Join AeThex and start building, learning, and collaborating with the community.",
    },
  },
  {
    pattern: /^\/dashboard/,
    meta: {
      title: "AeThex | Dashboard",
      description:
        "Your personal AeThex dashboard — manage projects, track progress, and connect.",
    },
  },
  {
    pattern: /^\/passport\/me$/,
    meta: {
      title: "AeThex | My Passport",
      description: "View your AeThex developer passport and profile.",
    },
  },
  {
    pattern: /^\/docs/,
    meta: {
      title: "AeThex | Documentation",
      description: "Guides, API references, and developer resources for AeThex.",
    },
  },
  {
    pattern: /^\/pricing/,
    meta: {
      title: "AeThex | Pricing",
      description:
        "Simple, transparent pricing for AeThex — individuals, teams, and enterprises.",
    },
  },
  {
    pattern: /^\/about/,
    meta: {
      title: "AeThex | About",
      description:
        "Learn about AeThex — our mission, team, and the technology we build.",
    },
  },
  {
    pattern: /^\/blog/,
    meta: {
      title: "AeThex | Blog",
      description:
        "News, tutorials, and announcements from the AeThex team and community.",
    },
  },
];

// UUID pattern
const PROJECT_UUID_RE =
  /^\/projects\/([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})$/i;
// Passport: /passport/<username> (not "me", handled above)
const PASSPORT_USER_RE = /^\/passport\/([^/]+)$/;

function escHtml(s: string): string {
  return s
    .replace(/&/g, "&amp;")
    .replace(/"/g, "&quot;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;");
}

/**
 * Replaces meta tag content values in the HTML template.
 * Handles both inline and multi-line attribute formats (Vite preserves them).
 */
function injectMeta(
  html: string,
  meta: RouteMeta & { url: string }
): string {
  const {
    title,
    description,
    url,
    image = DEFAULT_OG_IMAGE,
    type = "website",
  } = meta;

  const t = escHtml(title);
  const d = escHtml(description);
  const u = escHtml(url);
  const img = escHtml(image);

  return (
    html
      // <title>
      .replace(/<title>[^<]*<\/title>/, `<title>${t}</title>`)
      // meta name="description"
      .replace(
        /(<meta\s+name="description"\s+content=")[^"]*"/,
        `$1${d}"`
      )
      // og:title
      .replace(
        /(<meta\s+property="og:title"\s+content=")[^"]*"/,
        `$1${t}"`
      )
      // og:description
      .replace(
        /(<meta\s+property="og:description"\s+content=")[^"]*"/,
        `$1${d}"`
      )
      // og:url
      .replace(
        /(<meta\s+property="og:url"\s+content=")[^"]*"/,
        `$1${u}"`
      )
      // og:type
      .replace(
        /(<meta\s+property="og:type"\s+content=")[^"]*"/,
        `$1${type}"`
      )
      // og:image (first occurrence — the main image tag, not og:image:width/height)
      .replace(
        /(<meta\s+property="og:image"\s+content=")[^"]*"/,
        `$1${img}"`
      )
      // twitter:title
      .replace(
        /(<meta\s+name="twitter:title"\s+content=")[^"]*"/,
        `$1${t}"`
      )
      // twitter:description
      .replace(
        /(<meta\s+name="twitter:description"\s+content=")[^"]*"/,
        `$1${d}"`
      )
      // twitter:image
      .replace(
        /(<meta\s+name="twitter:image"\s+content=")[^"]*"/,
        `$1${img}"`
      )
      // canonical link
      .replace(
        /(<link\s+rel="canonical"\s+href=")[^"]*"/,
        `$1${u}"`
      )
  );
}

/** Resolve per-route meta, fetching from DB for dynamic routes. */
async function resolveRouteMeta(
  pathname: string
): Promise<RouteMeta & { url: string }> {
  const url = `${BASE_URL}${pathname}`;

  // Dynamic: project detail page
  const projectMatch = PROJECT_UUID_RE.exec(pathname);
  if (projectMatch && adminSupabase) {
    const projectId = projectMatch[1];
    try {
      const { data: project } = await (adminSupabase as any)
        .from("projects")
        .select("title, description, image_url, status")
        .eq("id", projectId)
        .maybeSingle();
      if (project) {
        const desc = project.description
          ? String(project.description).slice(0, 160)
          : `View the ${project.title} project on AeThex.`;
        return {
          title: `${project.title} — AeThex Project`,
          description: desc,
          image: project.image_url || DEFAULT_OG_IMAGE,
          type: "article",
          url,
        };
      }
    } catch {
      // fall through to default
    }
  }

  // Dynamic: public passport / profile page
  const passportMatch = PASSPORT_USER_RE.exec(pathname);
  if (passportMatch && adminSupabase) {
    const username = passportMatch[1];
    try {
      const { data: profile } = await adminSupabase
        .from("user_profiles")
        .select("username, full_name, avatar_url, bio")
        .eq("username", username)
        .maybeSingle();
      if (profile) {
        const displayName =
          (profile as any).full_name || profile.username || username;
        const bio = (profile as any).bio;
        const desc = bio
          ? String(bio).slice(0, 160)
          : `View ${displayName}'s developer passport and projects on AeThex.`;
        return {
          title: `${displayName} — AeThex Passport`,
          description: desc,
          url,
        };
      }
    } catch {
      // fall through
    }
  }

  // Static route map
  for (const { pattern, meta } of STATIC_META) {
    if (pattern.test(pathname)) {
      return { ...meta, url };
    }
  }

  // Default fallback
  return {
    title: "AeThex | Developer Platform for Builders, Creators & Innovation",
    description:
      "AeThex: an advanced development platform and community for builders. Collaborate on projects, learn, and ship innovation.",
    url,
  };
}

// Cache the HTML template (reset on read error so a rebuild is picked up on restart)
let htmlTemplate: string | null = null;

function getTemplate(): string {
  if (!htmlTemplate) {
    htmlTemplate = readFileSync(path.join(distPath, "index.html"), "utf-8");
  }
  return htmlTemplate;
}

// ── Route Handler ─────────────────────────────────────────────────────────────

app.get("*", async (req, res) => {
  if (req.path.startsWith("/api/") || req.path.startsWith("/health")) {
    return res.status(404).json({ error: "API endpoint not found" });
  }

  // Don't serve the SPA shell for missing static-asset requests — they should 404
  // cleanly rather than returning HTML (which causes "Unexpected token '<'" JS errors).
  if (/\.(js|mjs|cjs|css|map|png|jpg|jpeg|gif|svg|ico|woff|woff2|ttf|eot|webp|avif)$/i.test(req.path)) {
    return res.status(404).send("Not found");
  }

  try {
    const template = getTemplate();
    const meta = await resolveRouteMeta(req.path);
    const html = injectMeta(template, meta);
    res.setHeader("Content-Type", "text/html; charset=utf-8");
    // Crawlers should not cache — browsers can
    res.setHeader(
      "Cache-Control",
      "public, max-age=60, stale-while-revalidate=300"
    );
    res.send(html);
  } catch (err) {
    console.error("[SSR Meta] Error:", err);
    // Fallback: send unmodified file
    res.sendFile(path.join(distPath, "index.html"));
  }
});

// ── Server ────────────────────────────────────────────────────────────────────

app.listen(Number(port), host, () => {
  console.log(`🚀 AeThex server running on ${host}:${port}`);
  console.log(`📱 Frontend: http://${host}:${port}`);
  console.log(`🔧 API: http://${host}:${port}/api`);
});

process.on("SIGTERM", () => {
  console.log("🛑 Received SIGTERM, shutting down gracefully");
  process.exit(0);
});

process.on("SIGINT", () => {
  console.log("🛑 Received SIGINT, shutting down gracefully");
  process.exit(0);
});