import { readFileSync, writeFileSync } from 'fs';

import readStrings from '../src/util/data/readStrings';

const TOP_COMMENT = '// This file is generated by dev/generateLangTypes.ts. Do not edit it manually.\n';
const LANG_KEY_TYPE = 'export type LangKey = keyof LangPair;';

const data = readFileSync('./src/assets/localization/fallback.strings', 'utf8');

const parsed = readStrings(data);
const keysWithVars = Object.entries(parsed).reduce((acc, [keyWithSuffix, value]) => {
  const key = keyWithSuffix.split('_')[0];
  const variables = extractVariables(value);

  const previousVariables = acc[key] || [];
  if (!previousVariables.length) {
    acc[key] = variables;
  } else {
    acc[key] = Array.from(new Set([...previousVariables, ...variables]));
  }
  return acc;
}, {} as Record<string, string[]>);

let entries = '';

Object.entries(keysWithVars).forEach(([key, variables]) => {
  const varString = variables.length
    ? `{\n    ${variables.map((v) => `${wrapInQuotes(v)}: string | number;`).join('\n    ')}\n  };\n`
    : 'undefined;\n';
  entries += `  ${wrapInQuotes(key)}: ${varString}`;
});

const langPair = `export interface LangPair {\n${entries}\n}\n`;
const text = `${TOP_COMMENT}\n${langPair}\n${LANG_KEY_TYPE}\n`;
writeFileSync('./src/types/language.d.ts', text, 'utf8');
// eslint-disable-next-line no-console
console.log(`Language types generated: ${Object.keys(keysWithVars).length} keys`);

function extractVariables(value: string) {
  const matches = value.match(/(?<!\\){[^{}]+}/g);
  if (!matches) return [];
  return matches.map((match) => match.slice(1, -1));
}

function wrapInQuotes(value: string) {
  return `'${value}'`;
}