/**
 * Копирует содержимое папки public в папку gitverse.
 * Файлы `.png` не копируются (на GitVerse достаточно WebP и прочих ассетов).
 *
 * По умолчанию:
 *   node scripts/sync-gitverse.mjs
 *   (копирует projectRoot/public -> projectRoot/gitverse)
 *
 * Можно передать свои пути:
 *   node scripts/sync-gitverse.mjs <sourceDir> <targetDir>
 */

import path from "node:path";
import os from "node:os";
import fsp from "node:fs/promises";
import { execFile, spawn } from "node:child_process";
import { fileURLToPath } from "node:url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const projectRoot = path.resolve(__dirname, "..");
const PRESERVE_IN_TARGET = new Set([".git", ".gitverse"]);

function shouldSkipGitverseFile(fileName) {
  return path.extname(fileName).toLowerCase() === ".png";
}
const DEFAULT_SSH_KEY_PATH = path.join(os.homedir(), ".ssh", "id_ed25519_work");
const GITVERSE_SITE_URL = "https://mamadaevv.gitverse.site/me/";

/** Системный браузер по умолчанию (Windows / macOS / Linux). */
function openUrlInDefaultBrowser(url) {
  if (typeof url !== "string" || !/^https?:\/\//i.test(url)) return;
  const opts = { detached: true, stdio: "ignore" };
  let child;
  if (process.platform === "win32") {
    child = spawn("cmd", ["/c", "start", "", url], opts);
  } else if (process.platform === "darwin") {
    child = spawn("open", [url], opts);
  } else {
    child = spawn("xdg-open", [url], opts);
  }
  child?.unref();
}

function resolveDir(input, fallback) {
  const raw = input ?? fallback;
  return path.isAbsolute(raw) ? raw : path.resolve(projectRoot, raw);
}

async function ensureDirExists(dirPath, label) {
  try {
    const st = await fsp.stat(dirPath);
    if (!st.isDirectory()) {
      throw new Error(`${label} не является папкой: ${dirPath}`);
    }
  } catch (error) {
    if (error && error.code === "ENOENT") {
      throw new Error(`${label} не найдена: ${dirPath}`);
    }
    throw error;
  }
}

async function cleanTargetDir(targetDir) {
  await fsp.mkdir(targetDir, { recursive: true });
  const entries = await fsp.readdir(targetDir, { withFileTypes: true });

  for (const entry of entries) {
    if (PRESERVE_IN_TARGET.has(entry.name)) continue;
    const fullPath = path.join(targetDir, entry.name);
    await fsp.rm(fullPath, { recursive: true, force: true });
  }
}

async function copyDirFiltered(sourceDir, targetDir) {
  await fsp.mkdir(targetDir, { recursive: true });
  const entries = await fsp.readdir(sourceDir, { withFileTypes: true });
  for (const entry of entries) {
    const srcPath = path.join(sourceDir, entry.name);
    const dstPath = path.join(targetDir, entry.name);
    if (entry.isDirectory()) {
      await copyDirFiltered(srcPath, dstPath);
      continue;
    }
    if (!entry.isFile() || shouldSkipGitverseFile(entry.name)) continue;
    await fsp.copyFile(srcPath, dstPath);
  }
}

function runGit(args, cwd) {
  return new Promise((resolve, reject) => {
    const gitEnv = {
      ...process.env,
      GIT_SSH_COMMAND: `ssh -i "${DEFAULT_SSH_KEY_PATH}" -o IdentitiesOnly=yes`,
    };
    execFile("git", args, { cwd, encoding: "utf8", env: gitEnv }, (error, stdout, stderr) => {
      if (error) {
        reject(new Error((stderr || error.message || "").trim()));
        return;
      }
      resolve((stdout || "").trim());
    });
  });
}

function makeCommitMessage() {
  const now = new Date();
  const y = now.getFullYear();
  const m = String(now.getMonth() + 1).padStart(2, "0");
  const d = String(now.getDate()).padStart(2, "0");
  const hh = String(now.getHours()).padStart(2, "0");
  const mm = String(now.getMinutes()).padStart(2, "0");
  return `sync public ${y}-${m}-${d} ${hh}:${mm}`;
}

async function commitAndPush(targetDir) {
  const gitDir = path.join(targetDir, ".git");
  await ensureDirExists(gitDir, "Git репозиторий (.git)");
  try {
    await fsp.access(DEFAULT_SSH_KEY_PATH);
  } catch {
    throw new Error(`SSH-ключ не найден: ${DEFAULT_SSH_KEY_PATH}`);
  }

  await runGit(["add", "."], targetDir);
  const changed = await runGit(["status", "--porcelain"], targetDir);

  if (!changed) {
    console.log("Изменений для коммита нет.");
    return;
  }

  const message = makeCommitMessage();
  await runGit(["commit", "-m", message], targetDir);
  await runGit(["push"], targetDir);
  console.log(`Коммит и пуш выполнены: ${message}`);
  openUrlInDefaultBrowser(GITVERSE_SITE_URL);
  console.log(`Открыт в браузере: ${GITVERSE_SITE_URL}`);
}

async function main() {
  const sourceDir = resolveDir(process.argv[2], "public");
  const targetDir = resolveDir(process.argv[3], "gitverse");

  await ensureDirExists(sourceDir, "Исходная папка");

  if (sourceDir === targetDir) {
    throw new Error("Исходная и целевая папки совпадают.");
  }

  await cleanTargetDir(targetDir);
  await copyDirFiltered(sourceDir, targetDir);

  console.log(
    `Синхронизировано: ${path.relative(projectRoot, sourceDir)} -> ${path.relative(projectRoot, targetDir)} (сохранены .git и .gitverse)`,
  );
  await commitAndPush(targetDir);
}

main().catch((error) => {
  console.error("Ошибка копирования:", error.message || error);
  process.exit(1);
});