'use strict';

oml.ui.identifyDialog = function(data) {

    var ui = oml.user.ui,

        $form = Ox.Element(),

        $select = Ox.Select({
                items: [
                    {id: 'title', title: Ox._('Title, Author etc.')},
                    {id: 'isbn', title: Ox._('ISBN')},
                    {id: 'id', title: Ox._('ID')}
                ],
                overlap: 'right',
                max: 1,
                min: 1,
                style: 'squared',
                value: [data.isbn ? 'isbn' : 'title'],
                width: 128
            })
            .bindEvent({
                change: function(data) {
                    $input.options({
                        value: getValue(data.value)
                    }).focusInput(true);
                }
            }),

        $input = Ox.Input({
                style: 'squared',
                value: getValue($select.value()),
                width: 480
            })
            .bindEvent({
                change: function(data) {
                    // ...
                },
                submit: findMetadata
            }),

        $button = Ox.Button({
                overlap: 'left',
                style: 'squared',
                title: Ox._('Find'),
                width: 128
            })
            .bindEvent({
                click: findMetadata
            }),

        $formElement = Ox.FormElementGroup({
                elements: [
                    Ox.FormElementGroup({
                        elements: [
                            $select,
                            $input
                        ],
                        float: 'left'
                    }),
                    $button
                ],
                float: 'right'
            })
            .css({margin: '16px'})
            .appendTo($form),

        $list,

        $outerPanel = Ox.SplitPanel({
            elements: [
                {element: $form, size: 48},
                {element: renderResults([])}
            ],
            orientation: 'vertical'
        }),

        $dontUpdateButton = Ox.Button({
                id: 'dontupdate',
                style: 'squared',
                title: Ox._('No, Don\'t Update')
            })
            .bindEvent({
                click: function() {
                    that.close();
                }
            }),

        $updateButton = Ox.Button({
                disabled: true,
                id: 'update',
                style: 'squared',
                title: Ox._('Yes, Update')
            })
            .bindEvent({
                click: function() {
                    // FIXME: Wrong if user messes with lookup elements before clicking update button
                    var primaryId;
                    if (selected == 'lookup') {
                        primaryId = [
                            $lookupSelect.value(),
                            $lookupInput.value()
                        ];
                    } else {
                        primaryId = $list.value(
                            $list.options('selected')[0],
                            'primaryid'
                        );
                    }
                    that.options({content: Ox.LoadingScreen().start()});
                    that.disableButtons();
                    oml.api.edit({
                        id: data.id,
                        primaryid: primaryId
                    }, function(result) {
                        (
                            $metadataSelect.value() == 'original'
                            ? oml.api.resetMetadata : Ox.noop
                        )({id: ui.item}, function(result) {
                            Ox.Request.clearCache('find');
                            oml.$ui.info.updateElement();
                            oml.$ui.browser.reloadList(true);
                            oml.$ui.list.reloadList(true);
                            Ox.Request.clearCache(data.id);
                            oml.$ui.infoView.updateElement(data.id);
                            that.close();
                        });
                    });
                }
            }),

        that = Ox.Dialog({
            buttons: [
                $dontUpdateButton,
                $updateButton
            ],
            closeButton: true,
            content: $outerPanel,
            fixedSize: true,
            height: 384,
            removeOnClose: true,
            title: Ox._('Identify Book'),
            width: 768
        });

    function disableButtons() {
        $select.options('items').forEach(function(item) {
            $select.disableItem(item.id);
        });
        $input.options({disabled: true});
        $button.options({disabled: true});
        $updateButton.options({disabled: true});
    }

    function enableButtons() {
        $select.options('items').forEach(function(item) {
            $select.enableItem(item.id);
        });
        $input.options({disabled: false});
        $button.options({disabled: false});
        $updateButton.options({disabled: false});
    }

    function findMetadata() {
        disableButtons();
        $outerPanel.replaceElement(1, Ox.LoadingScreen().start());
        oml.api.findMetadata({
            key: $select.value(),
            value: $input.value()
        }, function(result) {
            var items = result.data.items.map(function(item, index) {
                return Ox.extend({index: index.toString()}, item);
            });
            enableButtons();
            $updateButton.options({disabled: !items.length});
            $outerPanel.replaceElement(1, renderResults(items));
        });
    }

    function getValue(key) {
        return key == 'title' ? Ox.decodeHTMLEntities(
                [data.title || ''].concat(data.author || []).join(' ')
            )
            : key == 'isbn' ? (data.isbn || '')
            : data.id
    }

    function renderResults(items) {
        var $innerPanel;
        if (items.length) {
            $list = Ox.TableList({
                    columns: [{
                        format: function(value, data) {
                            return '<b>' + data.title + '</b> ' + data.author
                        },
                        id: 'index',
                        visible: true,
                        width: 192 - Ox.UI.SCROLLBAR_SIZE
                    }],
                    items: items,
                    keys: [
                        'cover', 'title', 'author',
                        'publisher', 'place', 'date',
                        'series', 'edition', 'language', 'pages',
                        'categories', 'isbn', 'description', 'tableofcontents'
                    ],
                    min: 1,
                    max: 1,
                    scrollbarVisible: true,
                    selected: ['0'],
                    sort: [{key: 'index', operator: '+'}],
                    unique: 'index'
                })
                .bindEvent({
                    select: function(data) {
                        var index = data.ids[0];
                        $innerPanel.replaceElement(1, oml.ui.infoView($list.value(index)));
                    }
                }),
            $innerPanel = Ox.SplitPanel({
                elements: [
                    {element: $list || Ox.Element(), size: 192},
                    {element: Ox.Element()}
                ],
                orientation: 'horizontal'
            });
            setTimeout(function() {
                $list.triggerEvent('select', {ids: ['0']});
            });
        } else {
            $list = null;
            $innerPanel = Ox.Element();
        }
        return $innerPanel;
    }

    return that;

};