#!/usr/bin/env node

var program = require('commander');

program
  .usage('[../path/to/folder]')
  .option('-t, --tag <str>', 'link as a specific version/tag/commit/branch')
  .option('-r, --repository <str>', 'link as a specific repository')
  .option('--debug', 'turn on debug statements');

program.on('--help', function() {
  console.log('  Example: ');
  console.log();
  console.log('    $ component link ../delegate');
  console.log();
  process.exit();
});

program.parse(process.argv);

if (program.debug) require('debug').enable('component-consoler*');

var fs = require('fs');
var path = require('path');
var mkdirp = require('mkdirp');
var rimraf = require('rimraf');
var utils = require('component-consoler');

if (program.args.length !== 1) utils.fatal('requires exactly one local path.');

var from = path.resolve(program.args[0]);
var component = path.join(from, 'component.json');
if (!fs.existsSync(component)) utils.fatal(component + ' does not exist!');

if (path.relative(process.cwd(), from).slice(0, 2) !== '..') {
  utils.fatal('can not link a component inside the app context.');
}

var json = require(component);

var repository = program.repository || json.repository || json.repo;
if (!repository) utils.fatal(component + ' does not have a repository!');
if (!~repository.indexOf('/')) utils.fatal(component + ' invalid repository. Repositories are of the form <user>/<repo>.');

var version = program.tag || json.version;
if (!version) utils.fatal(component + ' does not have a version!');

var to = path.join(process.cwd(), 'components', repository, version);

rimraf.sync(to);
mkdirp.sync(path.dirname(to));
fs.symlinkSync(from, to, 'junction');