#!/usr/bin/env node
//
// Copyright (C) 2014  Codethink Limited
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; version 2 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

async = require("async");
npm = require("npm");
semver = require("semver");
util = require("util");

base = require("./importer_base");

function parseArgs(argv) {
  if (argv.length === 4)
    return argv[3];

  if (argv.length === 5)
    return argv[3] + '@' + argv[4];

  throw("Error! Wrong number of command line arguments! Usage: " +
        "./npm.find_deps SOURCE_DIR NAME VERSION");
}

function getDeps(er, packageInfo) {
  var names = [];
  var ranges = {};
  var resolved = {};

  package = base.getFirstItem(packageInfo);

  if (package.dependencies === undefined) {
    showDeps({});
    return;
  }

  names = Object.keys(package.dependencies);

  for (name in package.dependencies)
    ranges[name] = package.dependencies[name];

  var resolveDepVersion = function(depName, cb) {
    npm.commands.view([depName], "silent", function (er, packageInfoSet) {
      if (er) throw er;

      for (i in packageInfoSet) {
        package = packageInfoSet[i];

        resolved[package.name] = semver.maxSatisfying(package.versions, ranges[package.name]);
      };

      cb();
    })
  };

  async.each(names, resolveDepVersion, function(er){
    if (er) throw er;

    showDeps(resolved);
  })
};

function showDeps(runtimeDeps) {
  var output = {
  "npm": {
      "build-dependencies": {},
      "runtime-dependencies": runtimeDeps
    }
  };

  outputText = JSON.stringify(output, null, 4);
  console.log(outputText);
}

npm.load(function(er, npm) {
  var package = parseArgs(process.argv);
  if (er) throw er;
  npm.commands.view([package], "silent", getDeps);
});