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import { readdir } from 'node:fs/promises';
import { join, relative } from 'node:path';
import { fileURLToPath } from 'node:url';
import { readGameText } from './eu4_clausewitz/src/codec.mjs';
import { loadManifest, parsedText } from './history_language_manifest.mjs';

export const CJK = /[\u3400-\u9fff\uf900-\ufaff]/u;

async function walkTxtFiles(root, current = root) {
  const files = [];
  for (const entry of await readdir(current, { withFileTypes: true })) {
    const path = join(current, entry.name);
    if (entry.isDirectory()) files.push(...await walkTxtFiles(root, path));
    else if (entry.isFile() && entry.name.endsWith('.txt')) files.push(relative(root, path).replaceAll('\\', '/'));
  }
  return files;
}

function dynastyTokens(items) {
  const tokens = [];
  for (const item of items) {
    if (item.kind !== 'pair') continue;
    const key = item.keyToken.value;
    if (key === 'dynasty_names' && item.value.type === 'block') {
      for (const value of item.value.items) {
        if (value.kind === 'bare') tokens.push(value.token);
      }
      continue;
    }
    if ((key === 'dynasty' || key === 'heir_dynasty') && item.value.type === 'scalar' && item.value.token) {
      tokens.push(item.value.token);
    }
    if (item.value.type === 'block') tokens.push(...dynastyTokens(item.value.items));
  }
  return tokens;
}

function isDynastyManifestEntry(entry) {
  return entry.selector.blocks.some((block) => block.key === 'dynasty_names')
    || (entry.selector.target.kind === 'pair' && ['dynasty', 'heir_dynasty'].includes(entry.selector.target.key));
}

export async function auditDynastyLanguage(root, manifest, translations = {}) {
  const findings = [];
  const files = [];
  for (const scope of ['history', 'common']) {
    for (const path of await walkTxtFiles(join(root, scope))) files.push(`${scope}/${path}`);
  }
  for (const path of files) {
    const { text } = await readGameText(join(root, path));
    const { tree } = parsedText(text);
    for (const token of dynastyTokens(tree.items)) {
      if (!CJK.test(token.value)) findings.push({ id: 'dynasty-not-chinese', path, line: token.line, value: token.value });
    }
  }
  const byEnglish = new Map();
  for (const file of manifest.files) {
    for (const entry of file.entries) {
      if (!isDynastyManifestEntry(entry) || !translations[entry.english]) continue;
      const chinese = byEnglish.get(entry.english) ?? new Set();
      chinese.add(entry.chinese);
      byEnglish.set(entry.english, chinese);
    }
  }
  for (const [english, chinese] of byEnglish) {
    if (chinese.size > 1) findings.push({ id: 'dynasty-inconsistent-translation', english, chinese: [...chinese].sort() });
  }
  return findings;
}

function printFindings(findings) {
  for (const finding of findings) {
    if (finding.id === 'dynasty-not-chinese') {
      console.log(`${finding.path}:${finding.line}: ${finding.id}: ${finding.value}`);
    } else {
      console.log(`${finding.id}: ${finding.english} -> ${finding.chinese.join(' / ')}`);
    }
  }
}

async function main() {
  const root = join(fileURLToPath(new URL('..', import.meta.url)));
  const [manifest, translationMap] = await Promise.all([
    loadManifest(join(root, 'history_language_manifest.json')),
    import('./dynasty_translation_map.json', { with: { type: 'json' } }),
  ]);
  const findings = await auditDynastyLanguage(root, manifest, translationMap.default.translations);
  printFindings(findings);
  console.log(`Dynasty language audit: ${findings.length} findings.`);
  process.exitCode = findings.length > 0 ? 1 : 0;
}

if (process.argv[1] === fileURLToPath(import.meta.url)) await main();