pandora.ui.correlationsDialog = function() {

    function getData(callback) {
        let categories = {}
        let keywords = {}
        let segments = {}
        pandora.api.find({
            query: {conditions: [
                {key: 'id', operator: '!=', value: 'BA'} // "Blue"
            ], operator: ''}
        }, function(result) {
            let length = result.data.items
            let count = 0
            pandora.api.find({
                keys: ['id'],
                query: {conditions: [], operator: ''},
                range: [0, 1000000],
                sort: [{key: 'id', operator: '+'}]
            }, function(result) {
                result.data.items.forEach(function(item) {
                    pandora.api.get({
                        id: item.id,
                        keys: ['layers']
                    }, function(result) {
                        result.data.layers.keywords.forEach(function(keyword) {
                            let parts = keyword.value.split(': ')
                            if (parts.length != 2) {
                                return
                            }
                            let catKey = parts[0]
                            categories[catKey] = categories[catKey] || []
                            if (!categories[catKey].includes(keyword.value)) {
                                categories[catKey].push(keyword.value)
                            }
                            let segKey = item.id + '/' + keyword['in'] + '-' + keyword.out
                            segments[segKey] = segments[segKey] || []
                            segments[segKey].push(keyword.value)
                        })
                        if (++count == length) {
                            Object.keys(segments).forEach(function(segKey) {
                                segments[segKey].forEach(function(value1) {
                                    keywords[value1] = keywords[value1] || {
                                        count: 0,
                                        keywords: {}
                                    }
                                    keywords[value1].count++
                                    segments[segKey].forEach(function(value2) {
                                        if (value1 != value2) {
                                            keywords[value1].keywords[value2] = keywords[value1].keywords[value2] || 0
                                            keywords[value1].keywords[value2]++
                                        }
                                    })
                                })
                            })
                            callback({
                                categories: categories,
                                keywords: keywords,
                                segments: segments
                            })
                        }
                    })
                })
            })
        })
    }

    function getItems(categories, keywords, mainCat, relatedCat) {
        return categories[mainCat].map(function(keyword) {
            let max = 0
            let values = []
            Object.keys(keywords[keyword].keywords).filter(function(key) {
                return key.startsWith(relatedCat + ': ')
            }).forEach(function(key) {
                if (keywords[keyword].keywords[key] > max) {
                    max = keywords[keyword].keywords[key]
                    values = [key]
                } else if (keywords[keyword].keywords[key] == max) {
                    values.push(key)
                }
            })
            return {
                mainCount: keywords[keyword].count,
                mainKeyword: keyword,
                relatedCount: max,
                relatedKeyword: values.join('; ')
            }
        })
    }

    let $loadingScreen = Ox.LoadingScreen()
    let $dialog = Ox.Dialog({
        buttons: [
            Ox.Button({
                title: Ox._('Close'),
                width: 64
            }).bindEvent({
                click: function() {
                    $dialog.close()
                }
            })
        ],
        closeButton: true,
        content: $loadingScreen,
        height: window.innerHeight * 0.9 - 48,
        title: Ox._('Correlations'),
        width: 872
    }).bindEvent({
        open: function() {
            $loadingScreen.start()
            getData(function(data) {
                console.log(data)
                let categories = Object.keys(data.categories).sort()
                let mainCat = 'lived space'
                let relatedCat = 'architectural element'
                let $menuBar = Ox.Bar({size: 24})
                let $mainSelect = Ox.Select({
                    items: Object.keys(data.categories).sort().map(function(value) {
                        return {
                            id: value,
                            title: 'main: ' + value
                        }
                    }),
                    value: mainCat,
                    width: 320
                }).css({
                    left: '4px',
                    position: 'absolute',
                    top: '4px'
                }).bindEvent({
                    change: onChange
                }).appendTo($menuBar)
                let $relatedSelect = Ox.Select({
                    items: Object.keys(data.categories).sort().map(function(value) {
                        return {
                            id: value,
                            title: 'related: ' + value
                        }
                    }),
                    value: relatedCat,
                    width: 320
                }).css({
                    left: '336px',
                    position: 'absolute',
                    top: '4px'
                }).bindEvent({
                    change: onChange
                }).appendTo($menuBar)
                function onChange() {
                    mainCat = $mainSelect.value()
                    relatedCat = $relatedSelect.value()
                    listItems = getItems(data.categories, data.keywords, mainCat, relatedCat)
                    $list.options({items: listItems})
                }
                let $list = Ox.TableList({
                    columns: [
                        {
                            align: 'right',
                            format: Ox.formatNumber,
                            id: 'mainCount',
                            operator: '-',
                            title: Ox._('Count'),
                            visible: true,
                            width: 48
                        },
                        {
                            format: function(value) {
                                return '<a href="/clip/modified/keywords=='
                                    + value.replace(/ /g, '_')
                                    + '" target="_blank">' + value + '</a>'
                            },
                            id: 'mainKeyword',
                            operator: '+',
                            title: Ox._('Main Keyword'),
                            unique: true,
                            visible: true,
                            width: 256
                        },
                        {
                            align: 'right',
                            format: Ox.formatNumber,
                            id: 'relatedCount',
                            operator: '-',
                            title: Ox._('Count'),
                            visible: true,
                            width: 48
                        },
                        {
                            format: function(value, data) {
                                return value.split('; ').map(function(value) {
                                    return '<a href="/clip/modified/keywords=='
                                        + data.mainKeyword.replace(/ /g, '_')
                                        + '&keywords==' + value.replace(/ /g, ' ')
                                        + '" target="_blank">' + value + '</a>'
                                }).join('; ')
                            },
                            id: 'relatedKeyword',
                            operator: '+',
                            title: Ox._('Related Keyword'),
                            visible: true,
                            width: 512
                        }
                    ],
                    columnsMovable: true,
                    columnsResizable: true,
                    columnsVisible: true,
                    items: [],
                    scrollbarVisible: true,
                    sort: [{key: 'mainCount', operator: '-'}]
                }).bindEvent({
                    init: function(data) {
                        $status.html(Ox.formatNumber(data.items) + ' ' + Ox._('keywords'))
                    }
                })
                let listItems = []
                onChange()
                let $panel = Ox.SplitPanel({
                    elements: [
                        {element: $menuBar, size: 24},
                        {element: $list}
                    ],
                    orientation: 'vertical'
                })
                $loadingScreen.stop()
                $dialog.options({
                    content: $panel
                })
            })

        }
    })
    let $status = Ox.Element().css({
        fontSize: '9px',
        height: '10px',
        marginLeft: '96px',
        position: 'absolute',
        textAlign: 'center',
        top: '6px',
        width: '680px'
    }).appendTo($dialog.find('.OxButtonsbar'))

    return $dialog

}