/*
 * grunt
 * http://gruntjs.com/
 *
 * Copyright (c) 2013 "Cowboy" Ben Alman
 * Licensed under the MIT license.
 * https://github.com/gruntjs/grunt/blob/master/LICENSE-MIT
 */

'use strict';

var grunt = require('../grunt');

// Nodejs libs.
var path = require('path');

// External libs.
var nopt = require('nopt');

// This is only executed when run via command line.
var cli = module.exports = function (options, done) {
    // CLI-parsed options override any passed-in "default" options.
    if (options) {
        // For each defult option...
        Object.keys(options).forEach(function (key) {
            if (!(key in cli.options)) {
                // If this option doesn't exist in the parsed cli.options, add it in.
                cli.options[key] = options[key];
            } else if (cli.optlist[key].type === Array) {
                // If this option's type is Array, append it to any existing array
                // (or create a new array).
                [].push.apply(cli.options[key], options[key]);
            }
        });
    }

    // Run tasks.
    grunt.tasks(cli.tasks, cli.options, done);
};

// Default options.
var optlist = cli.optlist = {
    help: {
        short: 'h',
        info: 'Display this help text.',
        type: Boolean
    },
    base: {
        info: 'Specify an alternate base path. By default, all file paths are relative to the Gruntfile. (grunt.file.setBase) *',
        type: path
    },
    color: {
        info: 'Disable colored output.',
        type: Boolean,
        negate: true
    },
    gruntfile: {
        info: 'Specify an alternate Gruntfile. By default, grunt looks in the current or parent directories for the nearest Gruntfile.js or Gruntfile.coffee file.',
        type: path
    },
    debug: {
        short: 'd',
        info: 'Enable debugging mode for tasks that support it.',
        type: Number
    },
    stack: {
        info: 'Print a stack trace when exiting with a warning or fatal error.',
        type: Boolean
    },
    force: {
        short: 'f',
        info: 'A way to force your way past warnings. Want a suggestion? Don\'t use this option, fix your code.',
        type: Boolean
    },
    tasks: {
        info: 'Additional directory paths to scan for task and "extra" files. (grunt.loadTasks) *',
        type: Array
    },
    npm: {
        info: 'Npm-installed grunt plugins to scan for task and "extra" files. (grunt.loadNpmTasks) *',
        type: Array
    },
    write: {
        info: 'Disable writing files (dry run).',
        type: Boolean,
        negate: true
    },
    verbose: {
        short: 'v',
        info: 'Verbose mode. A lot more information output.',
        type: Boolean
    },
    version: {
        short: 'V',
        info: 'Print the grunt version. Combine with --verbose for more info.',
        type: Boolean
    },
    // Even though shell auto-completion is now handled by grunt-cli, leave this
    // option here for display in the --help screen.
    completion: {
        info: 'Output shell auto-completion rules. See the grunt-cli documentation for more information.',
        type: String
    },
};

// Parse `optlist` into a form that nopt can handle.
var aliases = {};
var known = {};

Object.keys(optlist).forEach(function (key) {
    var short = optlist[key].short;
    if (short) {
        aliases[short] = '--' + key;
    }
    known[key] = optlist[key].type;
});

var parsed = nopt(known, aliases, process.argv, 2);
cli.tasks = parsed.argv.remain;
cli.options = parsed;
delete parsed.argv;

// Initialize any Array options that weren't initialized.
Object.keys(optlist).forEach(function (key) {
    if (optlist[key].type === Array && !(key in cli.options)) {
        cli.options[key] = [];
    }
});
