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var t = require('plugindev');
var DummyFileSource = require('filesystem:tests/fixture').DummyFileSource;
var fs = require('filesystem');
var TextStorage = require('text_editor:models/textstorage').TextStorage;
var editsession = require('edit_session');
var Promise = require('bespin:promise').Promise;

var source = DummyFileSource.create({
    files: [
        {name: 'atTheTop.js', contents: 'the top file'},
        {name: 'anotherAtTheTop.js', contents: 'another file'},
        {name: 'foo/'},
        {name: 'deeply/nested/directory/andAFile.txt', contents: 'text file'}
    ]
});

exports.testBufferFileChange = function() {
    var root = fs.Filesystem.create({
        source: source
    });
    var buffer = editsession.Buffer.create();
    t.ok(buffer.get('model') != null, 
        'Model should be set to a TextStorage by default');
    t.ok(buffer.untitled(), 'Buffer should initially be untitled');
    var f = root.getFile('atTheTop.js');
    buffer.changeFileOnly(f);
    t.ok(!buffer.untitled(), 'Buffer should no longer be untitled');
    t.equal('', buffer.get('model').getValue(), 'Should be empty now');
    buffer.changeFileOnly(null);
    t.ok(buffer.untitled(), 'Buffer should be untitled again');
    buffer.set('file', f);
    var pr = new Promise();
    setTimeout(function() {
        var newtext = buffer.get('model').getValue();
        t.equal(newtext, 'the top file', 'Expected file contents to be loaded');
        
        // now we want to reset the buffer.
        buffer.changeFile(null);
        t.ok(buffer.untitled(), 'Buffer should be untitled again');
        newtext = buffer.get('model').getValue();
        t.equal(newtext, '', 'editor text should be empty');
        pr.resolve();
    }, 1);
    return pr;
};

exports.testBufferFileChangeWithCallback = function() {
    var root = fs.Filesystem.create({
        source: source
    });
    var buffer = editsession.Buffer.create();
    var f = root.getFile('atTheTop.js');
    var pr = buffer.changeFile(f);
    var testpr = pr.then(function(b) {
        t.equal(b, buffer, 'should have gotten the buffer object in');
        t.equal(b.get('model').getValue(), 'the top file', 'contents should be loaded');
        if (testpr != undefined) {
            testpr.resolve();
        }
    });
    return testpr;
};

exports.testBufferSaving = function() {
    source.reset();
    var testpr = new Promise();
    var root = fs.Filesystem.create({ source: source });
    var buffer = editsession.Buffer.create();
    var model = buffer.get('model');
    model.setValue('foobar');
    t.equal(model.getValue(), 'foobar', 'the value stored in ' +
        'the model and the string that was just written to it');

    var file1 = root.getFile('bar.txt');
    file1.exists().then(function(exists) {
        t.ok(!exists, 'file should not be there now');
        buffer.saveAs(file1).then(function() { 
            var request = source.requests.pop();
            t.equal(request[0], 'saveContents');
            t.equal(request[1][0], 'bar.txt');
            t.equal(request[1][1], 'foobar');

            file1.exists().then(function(exists) {
                t.ok(exists, 'file should now exist');
                testpr.resolve();
            });
        });
    });
    
    return testpr;
};
