#!/usr/bin/env node

var program = require('commander');

/**
 * Options.
 */

program
  .usage('[name ...]')
  .option('-d, --dev', 'install development dependencies')
  .option('-p, --proxy', 'use a proxy, eg. http://localhost:3128')
  .option('-t, --timeout <in ms>', 'use a timeout for remotes, default: 5000ms', 5000)
  .option('--debug', 'turn on debug statements')
  // .option('-p, --proxy <proxy>', 'use a proxy, eg. http://localhost:3128')
  .parse(process.argv);

/**
 * Examples.
 */

program.on('--help', function(){
  console.log('  Examples:');
  console.log();
  console.log('    # install deps in ./component.json');
  console.log('    $ component install');
  console.log();
  console.log('    # install a single component');
  console.log('    $ component install component/tip');
  console.log();
  console.log('    # install several components');
  console.log('    $ component install component/tip component/popover');
  console.log();
  console.log('    # install a specific tag / sha');
  console.log('    $ component install component/tip@8bf1ffc3f');
  console.log();
  console.log('    # install regular & development deps in .');
  console.log('    $ component install -d');
  console.log();
  process.exit();
});

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

var resolve = require('component-resolver');
var utils = require('component-consoler');
var semver = require('semver');
var path = require('path');
var fs = require('fs');

var exists = fs.existsSync;
var write = fs.writeFileSync;
var fatal = utils.fatal;
var log = utils.log;
var dependencies = program.args;
var jsonPath = path.resolve('component.json');
var hasJson = exists(jsonPath);

// whitespace

console.log();

process.on('exit', function(){
  console.log();
});

/**
 * Installer.
 */

var options = {
  development: program.dev,
  proxy: program.proxy,
  timeout: program.timeout,
  install: true,
  verbose: true,
};

// Install everything in the dependency tree
if (!dependencies.length) {
  if (!hasJson) fatal('missing component.json');
  resolve(process.cwd(), options, function (err) {
    if (err) fatal(err);
    log('install', 'complete');
  });
  return;
}

var json = hasJson && require(jsonPath);

var deps = {};
dependencies = dependencies.map(function (dependency) {
  var frags = dependency.split('@');
  var name = frags[0].toLowerCase();
  if (!~name.indexOf('/')) utils.fatal('"' + name + '" is not a valid dependency');
  var version = frags[1];
  deps[name] = version || '*';
  return [name, version];
});

resolve({
  dependencies: deps
}, options, function (err, tree) {
  if (err) fatal(err);
  log('install', 'complete');
  if (!json) return;

  json.dependencies = json.dependencies || {};

  dependencies.forEach(function (dep) {
    var name = dep[0];
    var version = dep[1];
    // if the dependency, don't install.
    // not sure if this is correct behavior.
    if (json.dependencies[name]) return;
    // if we're installing "any" version,
    // add a corresponding ^ or ~ to the current version
    if (!version) {
      var node = tree.dependencies[name];
      if (!node.version) {
        version = '*'; // this means master
      } else if (semver.gte(node.version, '1.0.0')) {
        version = '^' + node.version;
      } else {
        version = '~' + node.version;
      }
    }
    json.dependencies[name] = version;
  });

  write(jsonPath, JSON.stringify(json, null, 2));
})