import { readFileSync } from 'fs';
import path from 'path';

export const cwd = process.cwd();
export const pkg = JSON.parse(
  readFileSync(path.resolve(cwd, './package.json'), 'utf-8')
);
export const types = path.resolve(cwd, 'dist/types/');

const normalize = name =>
  name
    .replace(/[@\s\/\.]+/g, ' ')
    .trim()
    .replace(/\s+/, '-')
    .toLowerCase();

export const name = normalize(pkg.name);

export const sources = pkg.exports
  ? Object.keys(pkg.exports)
      .map(entry => {
        if (entry === './package.json') return undefined;
        const exports = pkg.exports[entry];
        const dir = normalize(entry);
        return {
          name: dir ? `${name}-${dir}` : name,
          dir: dir || '.',
          main: exports.require,
          module: exports.import,
          types: exports.types,
          source: exports.source,
        };
      })
      .filter(Boolean)
  : [
      {
        name,
        source: pkg.source || './src/index.ts',
      },
    ];

export const externalModules = ['dns', 'fs', 'path', 'url'];
if (pkg.peerDependencies)
  externalModules.push(...Object.keys(pkg.peerDependencies));
if (pkg.devDependencies)
  externalModules.push(...Object.keys(pkg.devDependencies));
if (pkg.dependencies) externalModules.push(...Object.keys(pkg.dependencies));
if (pkg.optionalDependencies)
  externalModules.push(...Object.keys(pkg.optionalDependencies));

const prodDependencies = new Set([
  ...Object.keys(pkg.peerDependencies || {}),
  ...Object.keys(pkg.dependencies || {}),
]);

const externalPredicate = new RegExp(`^(${externalModules.join('|')})($|/)`);

export const isExternal = id => {
  if (id === 'babel-plugin-transform-async-to-promises/helpers') return false;
  return externalPredicate.test(id);
};

export const hasNext = prodDependencies.has('next');
export const hasReact = prodDependencies.has('react');
export const hasPreact = prodDependencies.has('preact');
export const hasSvelte = prodDependencies.has('svelte');
export const hasVue = prodDependencies.has('vue');
export const mayReexport = hasReact || hasPreact || hasSvelte || hasVue;
export const isAnalyze = !!process.env.ANALYZE;