'use strict';
const message = process.env['HUSKY_GIT_PARAMS'];
const fs = require('fs');

const types = [
  'build',
  "chore",
  'ci',
  'docs',
  'feat',
  'fix',
  'perf',
  'refactor',
  "release",
  'revert',
  'style',
  'test'
];

const scopes = [
  "showcase",
  "packaging",
  "changelog",
  "schematics",
  "module:*"
];

function parseMessage(message) {
  const PATTERN = /^(\w+)(?:\(([^)]+)\))?\: (.+)$/;
  const match = PATTERN.exec(message);
  if (!match) {
    return null;
  }
  return {
    type: match[1] || null,
    scope: match[2] || null,
  }
}

function getScopesRule() {
  const messages = fs.readFileSync(message, {encoding: 'utf-8'});
  const parsed = parseMessage(messages.split('\n')[0]);
  if (!parsed) {
    return [2, 'always', scopes]
  }
  const { scope, type } = parsed;
  if (scope && !scopes.includes(scope) && type !== 'release' && !/module:.+/.test(scope)) {
    return [2, 'always', scopes]
  } else {
    return [2, 'always', []]
  }
}

module.exports = {
  extends: ['@commitlint/config-angular'],
  rules: {
    'type-enum': [2, 'always', types],
    'scope-enum': getScopesRule
  }
};