#!/usr/bin/env node

import { createHash } from "node:crypto";
import { mkdir, readFile, writeFile, copyFile } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";

const here = path.dirname(fileURLToPath(import.meta.url));
const reconstructionRoot = path.resolve(here, "..");
const configPath = path.join(reconstructionRoot, "selected-sources.json");
const outputRoot = path.join(reconstructionRoot, "sources");
const manifestPath = path.join(reconstructionRoot, "selected-sources-manifest.json");

const config = JSON.parse(await readFile(configPath, "utf8"));
const manifest = [];

for (const source of config.sources) {
  const bytes = await readFile(source.path);
  const text = bytes.toString("utf8");
  const title = text.match(/^#\s+(.+)$/m)?.[1]?.trim() ?? path.basename(source.path);
  const targetDir = path.join(outputRoot, source.group);
  const targetPath = path.join(targetDir, `${source.id}.source.txt`);
  await mkdir(targetDir, { recursive: true });
  await copyFile(source.path, targetPath);
  manifest.push({
    id: source.id,
    title,
    group: source.group,
    status: source.status,
    privacy: source.privacy,
    role: source.role,
    notion_url: `https://app.notion.com/p/${source.id}`,
    source_path: source.path,
    imported_path: path.relative(reconstructionRoot, targetPath),
    bytes: bytes.length,
    sha256: createHash("sha256").update(bytes).digest("hex")
  });
}

await writeFile(
  manifestPath,
  `${JSON.stringify({
    schema: "guanghu.selected-notion-source-manifest/v0.1",
    generated_at: new Date().toISOString(),
    source_count: manifest.length,
    copy_mode: "VERBATIM_BYTES_AS_SOURCE_TEXT",
    sources: manifest
  }, null, 2)}\n`
);

console.log(JSON.stringify({
  source_count: manifest.length,
  manifest: manifestPath,
  output_root: outputRoot
}, null, 2));