import path from "node:path";
import {
  readTextFileIfSmall,
  relative,
  walkFiles,
} from "./repository-files.mjs";

const checkedExtensions = new Set([
  ".css",
  ".html",
  ".js",
  ".json",
  ".kt",
  ".kts",
  ".md",
  ".mjs",
  ".properties",
  ".toml",
  ".xml",
  ".yaml",
  ".yml",
]);

const failures = [];
let checked = 0;
for (const file of await walkFiles()) {
  if (!checkedExtensions.has(path.extname(file).toLowerCase())) continue;
  const content = await readTextFileIfSmall(file);
  if (content === null) continue;
  checked += 1;

  if (content.length > 0 && !content.endsWith("\n")) {
    failures.push(`${relative(file)} must end with a newline`);
  }
  content.split(/\r?\n/u).forEach((line, index) => {
    if (/[ \t]+$/u.test(line)) failures.push(`${relative(file)}:${index + 1} has trailing whitespace`);
  });

  if (file.endsWith(".json")) {
    try {
      JSON.parse(content);
    } catch (error) {
      failures.push(`${relative(file)} is invalid JSON: ${error.message}`);
    }
  }
}

if (failures.length > 0) {
  console.error("Formatting verification failed:");
  for (const failure of failures) console.error(`- ${failure}`);
  process.exitCode = 1;
} else {
  console.log(`Formatting verification passed (${checked} text files).`);
}