var path = require('path');
var rimraf = require('rimraf');
var mout = require('mout');
var Q = require('q');
var Logger = require('bower-logger');
var Project = require('../core/Project');
var createLink = require('../util/createLink');
var cli = require('../util/cli');
var defaultConfig = require('../config');

function linkSelf(config) {
    var project;
    var logger = new Logger();

    config = mout.object.deepFillIn(config || {}, defaultConfig);
    project = new Project(config, logger);

    project.getJson()
    .then(function (json) {
        var src = config.cwd;
        var dst = path.join(config.storage.links, json.name);

        // Delete previous link if any
        return Q.nfcall(rimraf, dst)
        // Link globally
        .then(function () {
            return createLink(src, dst);
        })
        .then(function () {
            logger.emit('end', {
                src: src,
                dst: dst
            });
        });
    })
    .fail(function (error) {
        logger.emit('error', error);
    });

    return logger;
}

function linkTo(name, localName, config) {
    var src;
    var dst;
    var logger = new Logger();

    config = mout.object.deepFillIn(config || {}, defaultConfig);

    localName = localName || name;
    src = path.join(config.storage.links, name);
    dst = path.join(process.cwd(), config.directory, localName);

    // Delete destination folder if any
    Q.nfcall(rimraf, dst)
    // Link locally
    .then(function () {
        return createLink(src, dst);
    })
    .then(function () {
        logger.emit('end', {
            src: src,
            dst: dst
        });
    })
    .fail(function (error) {
        logger.emit('error', error);
    });

    return logger;
}

// -------------------

var link = {
    linkTo: linkTo,
    linkSelf: linkSelf
};

link.line = function (argv) {
    var options = link.options(argv);
    var name = options.argv.remain[1];
    var localName = options.argv.remain[2];

    if (name) {
        return linkTo(name, localName);
    }

    return linkSelf();
};

link.options = function (argv) {
    return cli.readOptions(argv);
};

link.completion = function () {
    // TODO:
};

module.exports = link;