'use strict';

var fs = require('fs');
var promises = require('fs/promises');
var path = require('path');
var debug = require('debug');

const log = debug('grunt-esig');
async function exists(file) {
  try {
    log('checking existence of %s', file);
    await promises.access(file);
    log('%s was found', file);
    return true
  } catch (error) {
    if (error.code !== 'ENOENT') throw error
    log('%s was not found', file);
  }
}
async function findProjectRootDir(currentWorkingDir, maxDepthToRoot = 10) {
  let dir = currentWorkingDir || '.';
  for (let i = 0; i < maxDepthToRoot; ++i) {
    log('looking for package.json in %s', dir);
    if (await exists(path.join(dir, 'package.json'))) {
      log('package.json found in %s', dir);
      return dir
    }
    dir = path.join('..', dir);
  }
  log('package.json not found in %d parent directories', maxDepthToRoot);
  throw new Error('Project root not found')
}
function findProjectRootDirSync(currentWorkingDir, maxDepthToRoot = 10) {
  let dir = currentWorkingDir || '.';
  for (let i = 0; i < maxDepthToRoot; ++i) {
    log('looking for package.json in %s', dir);
    if (fs.existsSync(path.join(dir, 'package.json'))) {
      log('package.json found in %s', dir);
      return dir
    }
    dir = path.join('..', dir);
  }
  log('package.json not found in %d parent directories', maxDepthToRoot);
  throw new Error('Project root not found')
}
function transFormIgnore(ignore, relativePathToRoot) {
  let newIgnore = ignore;
  if (newIgnore.endsWith('/')) {
    newIgnore += '**/*';
  }
  newIgnore = newIgnore.startsWith('!')
    ? `${path.join(relativePathToRoot, newIgnore.slice(1))}`
    : `!${path.join(relativePathToRoot, newIgnore)}`;
  log('transforming %s to %s', ignore, newIgnore);
  return newIgnore
}

function computeDirsAndPaths(ignoreFileName, currentWorkingDir, projectRootDir) {
  const gruntFileDir = currentWorkingDir ? path.resolve(currentWorkingDir) : process.cwd();
  const ignoreFileDir = path.isAbsolute(projectRootDir)
    ? projectRootDir
    : path.resolve(path.join(gruntFileDir, projectRootDir));
  const ignoreFilePath = path.join(ignoreFileDir, ignoreFileName || '.eslintignore');
  log('gruntfile directory is %s', gruntFileDir);
  log('ignore file directory is %s', ignoreFileDir);
  log('ignore file path is %s', ignoreFilePath);
  return { gruntFileDir, ignoreFileDir, ignoreFilePath }
}
function transformIgnoreLines(ignoreFileDir, gruntFileDir, ignoreLines) {
  const relativePathToRoot = path.relative(gruntFileDir, ignoreFileDir).replaceAll('\\', '/');
  log('transforming %d ignore lines to path %s', ignoreLines.length, relativePathToRoot);
  const ignores = ignoreLines
    .map(line => line.trim())
    .filter(line => line && !line.startsWith('#'));
  const skippedLines = ignoreLines.length - ignores.length;
  if (skippedLines) {
    log('skipping %d ignore line(s)', skippedLines);
  }
  return ignores.map(ignore => transFormIgnore(ignore, relativePathToRoot))
}
async function readEslintIgnoreFile({ ignoreFileName, currentWorkingDir, projectRootDir, maxDepthToRoot } = {}) {
  if (!projectRootDir) {
    projectRootDir = await findProjectRootDir(currentWorkingDir, maxDepthToRoot);
  }
  const { gruntFileDir, ignoreFileDir, ignoreFilePath } =
    computeDirsAndPaths(ignoreFileName, currentWorkingDir, projectRootDir);
  if (!await exists(ignoreFilePath)) {
    log('ignore file not found');
    return []
  }
  log('reading %s', ignoreFilePath);
  const ignoreLines = (await promises.readFile(ignoreFilePath, 'utf8')).split(/\r?\n/);
  return transformIgnoreLines(ignoreFileDir, gruntFileDir, ignoreLines)
}
function readEslintIgnoreFileSync({ ignoreFileName, currentWorkingDir, projectRootDir, maxDepthToRoot } = {}) {
  if (!projectRootDir) {
    projectRootDir = findProjectRootDirSync(currentWorkingDir, maxDepthToRoot);
  }
  const { gruntFileDir, ignoreFileDir, ignoreFilePath } =
    computeDirsAndPaths(ignoreFileName, currentWorkingDir, projectRootDir);
  if (!fs.existsSync(ignoreFilePath)) {
    log('ignore file not found');
    return []
  }
  log('reading %s', ignoreFilePath);
  const ignoreLines = fs.readFileSync(ignoreFilePath, 'utf8').split(/\r?\n/);
  return transformIgnoreLines(ignoreFileDir, gruntFileDir, ignoreLines)
}

exports.readEslintIgnoreFile = readEslintIgnoreFile;
exports.readEslintIgnoreFileSync = readEslintIgnoreFileSync;
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