var fs = require('fs');
var EventEmitter = require('events').EventEmitter;
var Seq = require('seq');

exports = module.exports = find;
exports.find = find;
function find (base, cb) {
    var em = new EventEmitter;
    var inodes = {};
    
    function finder (dir, f) {
        Seq()
            .seq(fs.readdir, dir, Seq)
            .flatten()
            .seqEach(function (file) {
                var p = dir + '/' + file;
                fs.stat(p, this.into(p));
            })
            .seq(function () {
                this(null, Object.keys(this.vars));
            })
            .flatten()
            .seqEach(function (file) {
                var stat = this.vars[file];
                if (cb) cb(file, stat);
                
                if (inodes[stat.ino]) {
                    // already seen this inode, probably a recursive symlink
                    this(null);
                }
                else {
                    em.emit('path', file, stat);
                    
                    if (stat.isDirectory()) {
                        em.emit('directory', file, stat);
                        finder(file, this);
                    }
                    else {
                        em.emit('file', file, stat);
                        this(null);
                    }
                    
                    inodes[stat.ino] = true;
                }
            })
            .seq(f.bind({}, null))
            .catch(em.emit.bind(em, 'error'))
        ;
    }
    
    fs.stat(base, function (err, s) {
        if (err) {
            em.emit('error', err);
        }
        else if (s.isDirectory()) {
            finder(base, em.emit.bind(em, 'end'));
        }
        else {
            em.emit('file', base);
            em.emit('end');
        }
    });
    
    return em;
};

exports.findSync = function findSync (dir, cb) {
    var rootStat = fs.statSync(dir);
    if (!rootStat.isDirectory()) {
        if (cb) cb(dir, rootStat);
        return [dir];
    }
    
    return fs.readdirSync(dir).reduce(function (files, file) {
        var p = dir + '/' + file;
        var stat = fs.statSync(p);
        if (cb) cb(p, stat);
        files.push(p);
        
        if (stat.isDirectory()) {
            files.push.apply(files, findSync(p, cb));
        }
        
        return files;
    }, []);
};

exports.find.sync = exports.findSync;