import ngModule from '../../module';
import Component from '../../lib/component';
import {buildFilter} from 'vn-loopback/util/filter';
import angular from 'angular';
import {camelToKebab} from '../../lib/string';
import './style.scss';
import './table.scss';

export default class SmartTable extends Component {
    constructor($element, $, $transclude) {
        super($element, $);
        this.currentUserId = window.localStorage.currentUserWorkerId;
        this.$transclude = $transclude;
        this.sortCriteria = [];
        this.$inputsScope;
        this.columns = [];
        this.autoSave = false;
        this.transclude();
    }

    $onDestroy() {
        const styleElement = document.querySelector('style[id="smart-table"]');
        if (this.$.css && styleElement)
            styleElement.parentNode.removeChild(styleElement);
    }

    get options() {
        return this._options;
    }

    set options(options) {
        this._options = options;
        if (!options) return;

        const activeButtons = options.activeButtons;
        const missingId = activeButtons && activeButtons.shownColumns && !this.viewConfigId;
        if (missingId)
            throw new Error('vnSmartTable: View identifier not defined');
    }

    get model() {
        return this._model;
    }

    set model(value) {
        this._model = value;
        if (value)
            this.$.model = value;
    }

    get viewConfigId() {
        return this._viewConfigId;
    }

    set viewConfigId(value) {
        this._viewConfigId = value;
    }

    getDefaultViewConfig() {
        const url = 'DefaultViewConfigs';
        const filter = {where: {tableCode: this.viewConfigId}};
        return this.$http.get(url, {filter})
            .then(res => {
                if (res && res.data.length)
                    return res.data[0].columns;
            });
    }

    get viewConfig() {
        return this._viewConfig;
    }

    set viewConfig(value) {
        this._viewConfig = value;

        if (!value) return;

        if (!value.length) {
            this.getDefaultViewConfig().then(columns => {
                const defaultViewConfig = columns ? columns : {};

                const userViewModel = this.$.userViewModel;
                for (const column of this.columns) {
                    if (defaultViewConfig[column.field] == undefined)
                        defaultViewConfig[column.field] = true;
                }

                userViewModel.insert({
                    userFk: this.currentUserId,
                    tableConfig: this.viewConfigId,
                    configuration: defaultViewConfig
                });
            }).finally(() => this.applyViewConfig());
        } else
            this.applyViewConfig();
    }

    get checkedRows() {
        const model = this.model;
        if (model && model.data)
            return model.data.filter(row => row.$checked);

        return null;
    }

    get checkAll() {
        return this._checkAll;
    }

    set checkAll(value) {
        this._checkAll = value;
        if (value !== undefined) {
            const shownColumns = this.viewConfig[0].configuration;
            for (let param in shownColumns)
                shownColumns[param] = value;
        }
    }

    transclude() {
        const slotTable = this.element.querySelector('#table');
        this.$transclude($clone => {
            const table = $clone[0];
            slotTable.appendChild(table);
            this.registerColumns();
            this.emptyDataRows();
        }, null, 'table');
    }

    saveViewConfig() {
        const userViewModel = this.$.userViewModel;
        const [viewConfig] = userViewModel.data;
        viewConfig.configuration = Object.assign({}, viewConfig.configuration);
        userViewModel.save()
            .then(() => this.vnApp.showSuccess(this.$t('Data saved!')))
            .then(() => this.applyViewConfig())
            .then(() => this.$.smartTableColumns.hide());
    }

    applyViewConfig() {
        const userViewModel = this.$.userViewModel;
        const [viewConfig] = userViewModel.data;

        const selectors = [];
        for (const column of this.columns) {
            if (viewConfig.configuration[column.field] == false) {
                const baseSelector = `smart-table[view-config-id="${this.viewConfigId}"] table`;
                selectors.push(`${baseSelector} thead > tr > th:nth-child(${column.index + 1})`);
                selectors.push(`${baseSelector} tbody > tr > td:nth-child(${column.index + 1})`);
            }
        }

        const styleElement = document.querySelector('style[id="smart-table"]');

        if (styleElement)
            styleElement.parentNode.removeChild(styleElement);

        if (selectors.length) {
            const rule = selectors.join(', ') + '{display: none}';
            this.$.css = document.createElement('style');
            this.$.css.setAttribute('id', 'smart-table');
            document.head.appendChild(this.$.css);
            this.$.css.appendChild(document.createTextNode(rule));
        }
    }

    registerColumns() {
        const header = this.element.querySelector('thead > tr');
        if (!header) return;
        const columns = header.querySelectorAll('th');

        // Click handler
        for (const [index, column] of columns.entries()) {
            const field = column.getAttribute('field');
            if (field) {
                const columnElement = angular.element(column);
                const caption = columnElement.text().trim();

                this.columns.push({field, caption, index});

                column.addEventListener('click', () => this.orderHandler(column));
            }
        }
    }

    emptyDataRows() {
        const header = this.element.querySelector('thead > tr');
        const columns = header.querySelectorAll('th');
        const tbody = this.element.querySelector('tbody');
        if (tbody) {
            const noSearch = this.$compile(`
                    <tr class="empty-rows" ng-if="!model.data">
                        <td colspan="${columns.length}" translate>Enter a new search</td>
                    </tr>
                `)(this.$);
            tbody.appendChild(noSearch[0]);

            const noRows = this.$compile(`
                    <tr class="empty-rows" ng-if="model.data.length == 0">
                        <td colspan="${columns.length}" translate>No data</td>
                    </tr>
                `)(this.$);
            tbody.appendChild(noRows[0]);
        }
    }

    orderHandler(element) {
        const field = element.getAttribute('field');
        const existingCriteria = this.sortCriteria.find(criteria => {
            return criteria.field == field;
        });

        const isASC = existingCriteria && existingCriteria.sortType == 'ASC';
        const isDESC = existingCriteria && existingCriteria.sortType == 'DESC';

        if (!existingCriteria) {
            this.sortCriteria.push({field: field, sortType: 'ASC'});
            element.classList.remove('desc');
            element.classList.add('asc');
        }

        if (isDESC) {
            this.sortCriteria.splice(this.sortCriteria.findIndex(criteria => {
                return criteria.field == field;
            }), 1);
            element.classList.remove('desc');
            element.classList.remove('asc');
        }

        if (isASC) {
            existingCriteria.sortType = 'DESC';
            element.classList.remove('asc');
            element.classList.add('desc');
        }

        this.applySort();
    }

    displaySearch() {
        const header = this.element.querySelector('thead > tr');
        if (!header) return;

        const tbody = this.element.querySelector('tbody');
        const columns = header.querySelectorAll('th');

        const hasSearchRow = tbody.querySelector('tr#searchRow');
        if (hasSearchRow) {
            if (this.$inputsScope)
                this.$inputsScope.$destroy();

            return hasSearchRow.remove();
        }

        const searchRow = document.createElement('tr');
        searchRow.setAttribute('id', 'searchRow');

        this.$inputsScope = this.$.$new();

        for (let column of columns) {
            const field = column.getAttribute('field');
            const cell = document.createElement('td');
            if (field) {
                let input;
                let options;
                const columnOptions = this.options && this.options.columns;

                if (columnOptions)
                    options = columnOptions.find(column => column.field == field);

                if (options && options.searchable == false) {
                    searchRow.appendChild(cell);
                    continue;
                }

                if (options && options.autocomplete) {
                    let props = ``;

                    const autocomplete = options.autocomplete;
                    for (const prop in autocomplete)
                        props += `${camelToKebab(prop)}="${autocomplete[prop]}"\n`;
                    input = this.$compile(`
                    <vn-autocomplete
                        class="dense"
                        name="${field}"
                        ng-model="searchProps['${field}']"
                        ${props}
                        on-change="$ctrl.searchByColumn('${field}')"
                        clear-disabled="true"
                    />`)(this.$inputsScope);
                } else {
                    input = this.$compile(`
                        <vn-textfield
                            class="dense"
                            name="${field}"
                            ng-model="searchProps['${field}']"
                            ng-keydown="$ctrl.searchWithEvent($event, '${field}')"
                            clear-disabled="true"
                        />`)(this.$inputsScope);
                }
                cell.appendChild(input[0]);
            }
            searchRow.appendChild(cell);
        }

        tbody.prepend(searchRow);
    }

    searchWithEvent($event, field) {
        if ($event.key != 'Enter') return;

        this.searchByColumn(field);
    }

    searchByColumn(field) {
        const searchCriteria = this.$inputsScope.searchProps[field];
        const emptySearch = searchCriteria == '' || null;

        const filters = this.filterSanitizer(field);

        if (filters && filters.userFilter)
            this.model.userFilter = filters.userFilter;

        if (!emptySearch)
            this.addFilter(field, this.$inputsScope.searchProps[field]);
        else this.model.refresh();
    }

    addFilter(field, value) {
        let where = {[field]: value};

        if (this.exprBuilder) {
            where = buildFilter(where, (param, value) =>
                this.exprBuilder({param, value})
            );
        }

        this.model.addFilter({where});
    }

    applySort() {
        let order = this.sortCriteria.map(criteria => `${criteria.field} ${criteria.sortType}`);
        order = order.join(', ');

        if (order)
            this.model.order = order;

        this.model.refresh();
    }

    filterSanitizer(field) {
        const userFilter = this.model.userFilter;
        const userParams = this.model.userParams;
        const where = userFilter && userFilter.where;

        if (this.exprBuilder) {
            const param = this.exprBuilder({
                param: field,
                value: null
            });
            if (param) [field] = Object.keys(param);
        }

        if (!where) return;

        const whereKeys = Object.keys(where);
        for (let key of whereKeys) {
            removeProp(where, field, key);

            if (!Object.keys(where))
                delete userFilter.where;
        }

        function removeProp(instance, findProp, prop) {
            if (prop == findProp)
                delete instance[prop];

            if (prop === 'and') {
                for (let [index, param] of instance[prop].entries()) {
                    const [key] = Object.keys(param);
                    if (key == findProp)
                        instance[prop].splice(index, 1);

                    if (param[key] instanceof Array)
                        removeProp(param, field, key);
                }
            }
        }

        return {userFilter, userParams};
    }

    removeFilter() {
        this.model.applyFilter(userFilter, userParams);
    }

    createRow() {
        let data = {};

        if (this.defaultNewData)
            data = this.defaultNewData();

        this.model.insert(data);
    }

    deleteAll() {
        for (let row of this.checkedRows)
            this.model.removeRow(row);

        if (this.autoSave)
            this.saveAll();
    }

    saveAll() {
        const model = this.model;

        if (!model.isChanged)
            return this.vnApp.showError(this.$t('No changes to save'));

        this.model.save()
            .then(() => this.vnApp.showSuccess(this.$t('Data saved!')));
    }
}

SmartTable.$inject = ['$element', '$scope', '$transclude'];

ngModule.vnComponent('smartTable', {
    template: require('./index.html'),
    controller: SmartTable,
    transclude: {
        table: '?slotTable',
        actions: '?slotActions'
    },
    bindings: {
        model: '<?',
        viewConfigId: '@?',
        autoSave: '<?',
        exprBuilder: '&?',
        defaultNewData: '&?',
        options: '<?'
    }
});