#!/usr/bin/env node

/**
 * Migrate Hub User Guide content from content/wiki/hub/ into Outline.
 *
 * Reads plain markdown files (no frontmatter), extracts titles from H1 headers,
 * and creates nested documents matching the directory structure.
 *
 * Usage:
 *   OUTLINE_URL=https://wiki.ghostguild.org OUTLINE_API_TOKEN=your-token node migrate-hub.js
 */

import fs from "fs/promises";
import path from "path";
import { fileURLToPath } from "url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));

const OUTLINE_URL = process.env.OUTLINE_URL;
const OUTLINE_API_TOKEN = process.env.OUTLINE_API_TOKEN;
const CONTENT_DIR = path.resolve(__dirname, "../content/wiki/hub");
const COLLECTION_NAME = "Hub User Guide";
const RATE_LIMIT_MS = 200;

if (!OUTLINE_URL || !OUTLINE_API_TOKEN) {
  console.error(
    "Error: OUTLINE_URL and OUTLINE_API_TOKEN env vars are required."
  );
  process.exit(1);
}

async function outlineApi(endpoint, body) {
  const res = await fetch(`${OUTLINE_URL}/api/${endpoint}`, {
    method: "POST",
    headers: {
      "Content-Type": "application/json",
      Authorization: `Bearer ${OUTLINE_API_TOKEN}`,
    },
    body: JSON.stringify(body),
  });

  if (!res.ok) {
    const text = await res.text();
    throw new Error(`API ${endpoint} failed (${res.status}): ${text}`);
  }

  return res.json();
}

function delay(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

function extractTitle(content, filename) {
  const match = content.match(/^#\s+(.+)$/m);
  if (match) return match[1];
  // Fallback: clean up filename
  return filename
    .replace(/^\d+-/, "")
    .replace(/\.md$/, "")
    .replace(/-/g, " ")
    .replace(/\b\w/g, (c) => c.toUpperCase());
}

function stripH1(content) {
  // Remove the first H1 line since Outline uses the title field
  return content.replace(/^#\s+.+\n*/, "").trim();
}

// Section display names for subdirectories
const SECTION_NAMES = {
  admin: "Admin Guide",
  reviewer: "Reviewer Guide",
  reference: "Reference",
};

async function findCollection(name) {
  const { data } = await outlineApi("collections.list", { limit: 100 });
  const existing = data.find(
    (c) => c.name.toLowerCase() === name.toLowerCase()
  );
  if (!existing) {
    throw new Error(
      `Collection "${name}" not found. Available: ${data.map((c) => c.name).join(", ")}`
    );
  }
  return existing.id;
}

async function createDoc({ title, text, collectionId, parentDocumentId }) {
  const body = { title, text, collectionId, publish: true };
  if (parentDocumentId) body.parentDocumentId = parentDocumentId;
  const { data: doc } = await outlineApi("documents.create", body);
  return doc;
}

async function importFiles(dir, collectionId, parentDocumentId) {
  const entries = await fs.readdir(dir, { withFileTypes: true });

  // Sort: files first (by name), then directories (by name)
  const files = entries.filter((e) => e.isFile() && e.name.endsWith(".md")).sort((a, b) => a.name.localeCompare(b.name));
  const dirs = entries.filter((e) => e.isDirectory()).sort((a, b) => a.name.localeCompare(b.name));

  let success = 0;
  let failed = 0;

  // Import markdown files
  for (const file of files) {
    const filePath = path.join(dir, file.name);
    const raw = await fs.readFile(filePath, "utf-8");
    const title = extractTitle(raw, file.name);
    const text = stripH1(raw);

    try {
      const doc = await createDoc({
        title,
        text,
        collectionId,
        parentDocumentId,
      });
      console.log(`  ✓ ${title} → ${doc.url}`);
      success++;
    } catch (err) {
      console.error(`  ✗ ${title}: ${err.message}`);
      failed++;
    }

    await delay(RATE_LIMIT_MS);
  }

  // Recurse into subdirectories, creating a parent doc for each
  for (const sub of dirs) {
    const sectionName = SECTION_NAMES[sub.name] || sub.name.replace(/\b\w/g, (c) => c.toUpperCase());
    console.log(`\n📂 ${sectionName}`);

    try {
      // Create a parent document for this section
      const parentDoc = await createDoc({
        title: sectionName,
        text: "",
        collectionId,
        parentDocumentId,
      });
      await delay(RATE_LIMIT_MS);

      const result = await importFiles(
        path.join(dir, sub.name),
        collectionId,
        parentDoc.id
      );
      success += result.success;
      failed += result.failed;
    } catch (err) {
      console.error(`  ✗ Failed to create section "${sectionName}": ${err.message}`);
      failed++;
    }
  }

  return { success, failed };
}

async function main() {
  console.log(`Looking up collection: ${COLLECTION_NAME}\n`);
  const collectionId = await findCollection(COLLECTION_NAME);
  console.log(`Found collection: ${collectionId}\n`);

  const { success, failed } = await importFiles(CONTENT_DIR, collectionId, null);
  console.log(`\nDone. ${success} imported, ${failed} failed.`);
}

main().catch((err) => {
  console.error("Migration failed:", err);
  process.exit(1);
});