iD.ui = function(context) {
    return function(container) {
        context.container(container);

        var connection = context.connection(),
            history = context.history(),
            map = context.map();

        if (!iD.detect().support) {
            container.text(t('browser_notice'))
                .style('text-align:center;font-style:italic;');
            return;
        }

        if (iD.detect().opera) container.classed('opera', true);

        function hintprefix(x, y) {
            return '<span>' + y + '</span>' + '<div class="keyhint-wrap"><span class="keyhint"> ' + x + '</span></div>';
        }

        var m = container.append('div')
            .attr('id', 'map')
            .call(map);

        var bar = container.append('div')
            .attr('id', 'bar')
            .attr('class','pad1 fillD');

        var limiter = bar.append('div')
            .attr('class', 'limiter');

        var buttons_joined = limiter.append('div')
            .attr('class', 'button-wrap joined col4');

        var modes = [
            iD.modes.Browse(context),
            iD.modes.AddPoint(context),
            iD.modes.AddLine(context),
            iD.modes.AddArea(context)];

        var buttons = buttons_joined.selectAll('button.add-button')
            .data(modes)
            .enter().append('button')
                .attr('tabindex', -1)
                .attr('class', function(mode) { return mode.title + ' add-button col3'; })
            .call(bootstrap.tooltip().placement('bottom').html(true))
            .attr('data-original-title', function(mode) {
                return hintprefix(mode.key, mode.description);
            })
            .on('click.editor', function(mode) { context.enter(mode); });

        function disableTooHigh() {
            if (map.editable()) {
                notice.message(false);
                buttons.attr('disabled', null);
            } else {
                buttons.attr('disabled', 'disabled');
                notice.message(true);
                context.enter(iD.modes.Browse(context));
            }
        }

        var notice = iD.ui.notice(limiter)
            .message(false)
            .on('zoom', function() { map.zoom(16); });

        map.on('move.editor', _.debounce(disableTooHigh, 500));

        buttons.append('span')
            .attr('class', function(d) {
                return d.id + ' icon icon-pre-text';
            });

        buttons.append('span').attr('class', 'label').text(function(mode) { return mode.title; });

        context.on('enter.editor', function(entered) {
            buttons.classed('active', function(mode) { return entered.button === mode.button; });
            container.classed("mode-" + entered.id, true);
        });

        context.on('exit.editor', function(exited) {
            container.classed("mode-" + exited.id, false);
        });

        var undo_buttons = limiter.append('div')
            .attr('class', 'button-wrap joined col1'),
            undo_tooltip = bootstrap.tooltip().placement('bottom').html(true);

        undo_buttons.append('button')
            .attr({ id: 'undo', 'class': 'col6' })
            .classed('disabled', true)
            .html("<span class='undo icon'></span><small></small>")
            .on('click.editor', history.undo)
            .call(undo_tooltip);

        undo_buttons.append('button')
            .attr({ id: 'redo', 'class': 'col6' })
            .classed('disabled', true)
            .html("<span class='redo icon'><small></small>")
            .on('click.editor', history.redo)
            .call(undo_tooltip);

        limiter.append('div').attr('class','button-wrap col1').append('button')
            .attr('class', 'save col12')
            .call(iD.ui.save(context));

        var zoom = container.append('div')
            .attr('class', 'zoombuttons map-control')
            .selectAll('button')
                .data([['zoom-in', '+', map.zoomIn, t('zoom-in')], ['zoom-out', '-', map.zoomOut, t('zoom-out')]])
                .enter()
                .append('button')
                .attr('tabindex', -1)
                .attr('class', function(d) { return d[0]; })
                .attr('title', function(d) { return d[3]; })
                .on('click.editor', function(d) { return d[2](); })
                .append('span')
                    .attr('class', function(d) {
                        return d[0] + ' icon';
                    });

        if (navigator.geolocation) {
            container.append('div')
                .call(iD.ui.geolocate(map));
        }

        container.append('div').attr('class', 'geocode-control map-control')
            .call(iD.ui.geocoder(context));

        container.append('div').attr('class', 'map-control layerswitcher-control')
            .call(iD.ui.layerswitcher(context));

        container.append('div')
            .style('display', 'none')
            .attr('class', 'inspector-wrap fr col5');

        var about = container.append('div')
            .attr('class','col12 about-block fillD pad1');

        var userContainer = about.append('div')
            .attr('class', 'user-container');

        userContainer
            .append('div')
                .attr('class', 'hello');

        var aboutList = about.append('ul')
                .attr('id','about')
                .attr('class','link-list');

        var linkList = aboutList.append('ul')
            .attr('id','about')
            .attr('class','pad1 fillD about-block link-list');

        linkList.append('li')
            .append('a')
            .attr('target', '_blank')
            .attr('href', 'http://github.com/systemed/iD')
            .text(iD.version);

        linkList.append('li')
            .append('a')
            .attr('target', '_blank')
            .attr('href', 'http://github.com/systemed/iD/issues')
            .text(t('report_a_bug'));

        var imagery = linkList.append('li')
            .attr('id', 'attribution');

        imagery.append('span')
            .text('imagery');

        imagery
            .append('span')
            .attr('class', 'provided-by');

        linkList.append('li')
            .attr('class', 'source-switch')
            .call(iD.ui.SourceSwitch(context));

        linkList.append('li')
            .attr('id', 'user-list')
            .call(iD.ui.contributors(context));

        window.onbeforeunload = function() {
            history.save();
            if (history.hasChanges()) return t('unsaved_changes');
        };

        history.on('change.editor', function() {

            var undo = history.undoAnnotation(),
                redo = history.redoAnnotation();

            function refreshTooltip(selection) {
                if (selection.property('disabled')) {
                    selection.call(undo_tooltip.hide);
                } else if (selection.property('tooltipVisible')) {
                    selection.call(undo_tooltip.show);
                }
            }

            var mod = {
                'mac': '⌘',
                'win': 'Ctrl',
                'linux': 'Ctrl'
            }[iD.detect().os];

            limiter.select('#undo')
                .classed('disabled', !undo)
                .attr('data-original-title', hintprefix(mod + ' + Z', undo || t('nothing_to_undo')))
                .call(refreshTooltip);

            limiter.select('#redo')
                .classed('disabled', !redo)
                .attr('data-original-title', hintprefix(mod + ' + ⇧ + Z', redo || t('nothing_to_redo')))
                .call(refreshTooltip);
        });

        d3.select(window).on('resize.editor', function() {
            map.size(m.size());
        });

        function pan(d) {
            return function() {
                map.pan(d);
                map.redraw();
            };
        }

        // pan amount
        var pa = 5;

        var keybinding = d3.keybinding('main')
            .on('⌘+Z', function() { history.undo(); })
            .on('⌃+Z', function() { history.undo(); })
            .on('⌘+⇧+Z', function() { history.redo(); })
            .on('⌃+⇧+Z', function() { history.redo(); })
            .on('⌫', function() { d3.event.preventDefault(); })
            .on('←', pan([pa, 0]))
            .on('↑', pan([0, pa]))
            .on('→', pan([-pa, 0]))
            .on('↓', pan([0, -pa]))
            .on('⇧+=', function() { map.zoomIn(); })
            .on('+', function() { map.zoomIn(); })
            .on('-', function() { map.zoomOut(); })
            .on('dash', function() { map.zoomOut(); });

        modes.forEach(function(m) {
            keybinding.on(m.key, function() { if (map.editable()) context.enter(m); });
        });

        d3.select(document)
            .call(keybinding);

        var hash = iD.behavior.Hash(context);

        hash();

        if (!hash.hadHash) {
            map.centerZoom([-77.02271, 38.90085], 20);
        }

        userContainer.call(iD.ui.userpanel(connection)
            .on('logout.editor', connection.logout)
            .on('login.editor', connection.authenticate));

        context.enter(iD.modes.Browse(context));

        if (!context.storage('sawSplash')) {
            iD.ui.splash(context.container());
            context.storage('sawSplash', true);
        }

        if (history.lock() && history.restorableChanges()) {
            iD.ui.restore(context.container(), history);
        }

    };
};