import {Feature} from '../feature';
import {createElm, removeElm, id, tag} from '../dom';
import {isFn, isNull, isUndef} from '../types';
import Event from '../event';
import {contains} from '../string';
import {NONE} from '../const';

export class GridLayout extends Feature {

    /**
     * Grid layout, table with fixed headers
     * @param {Object} tf TableFilter instance
     */
    constructor(tf) {
        super(tf, 'gridLayout');

        let f = this.config;

        //defines grid width
        this.gridWidth = f.grid_width || null;
        //defines grid height
        this.gridHeight = f.grid_height || null;
        //defines css class for main container
        this.gridMainContCssClass = f.grid_cont_css_class || 'grd_Cont';
        //defines css class for div containing table
        this.gridContCssClass = f.grid_tbl_cont_css_class || 'grd_tblCont';
        //defines css class for div containing headers' table
        this.gridHeadContCssClass = f.grid_tblHead_cont_css_class ||
            'grd_headTblCont';
        //defines css class for div containing rows counter, paging etc.
        this.gridInfDivCssClass = f.grid_inf_grid_css_class || 'grd_inf';
        //defines which row contains column headers
        this.gridHeadRowIndex = f.grid_headers_row_index || 0;
        //array of headers row indexes to be placed in header table
        this.gridHeadRows = f.grid_headers_rows || [0];
        //generate filters in table headers
        this.gridEnableFilters = !isUndef(f.grid_enable_default_filters) ?
            f.grid_enable_default_filters : true;
        this.noHeaders = Boolean(f.grid_no_headers);
        //default col width
        this.gridDefaultColWidth = f.grid_default_col_width || '100px';

        this.gridColElms = [];

        //div containing grid elements if grid_layout true
        this.prfxMainTblCont = 'gridCont_';
        //div containing table if grid_layout true
        this.prfxTblCont = 'tblCont_';
        //div containing headers table if grid_layout true
        this.prfxHeadTblCont = 'tblHeadCont_';
        //headers' table if grid_layout true
        this.prfxHeadTbl = 'tblHead_';
        //id of td containing the filter if grid_layout true
        this.prfxGridFltTd = '_td_';
        //id of th containing column header if grid_layout true
        this.prfxGridTh = 'tblHeadTh_';

        this.sourceTblHtml = tf.tbl.outerHTML;

        // filters flag at TF level
        tf.fltGrid = this.gridEnableFilters;
    }

    /**
     * Generates a grid with fixed headers
     */
    init() {
        let tf = this.tf;
        let f = this.config;
        let tbl = tf.tbl;

        if (this.initialized) {
            return;
        }

        // Override reference rows indexes
        tf.refRow = isNull(tf.startRow) ? 0 : tf.startRow;
        tf.headersRow = 0;
        tf.filtersRowIndex = 1;

        tf.isExternalFlt = true;

        // default width of 100px if column widths not set
        if (!tf.hasColWidths) {
            tf.colWidths = [];
            for (let k = 0; k < tf.nbCells; k++) {
                let colW,
                    cell = tbl.rows[this.gridHeadRowIndex].cells[k];
                if (cell.width !== '') {
                    colW = cell.width;
                } else if (cell.style.width !== '') {
                    colW = parseInt(cell.style.width, 10);
                } else {
                    colW = this.gridDefaultColWidth;
                }
                tf.colWidths[k] = colW;
            }
            tf.hasColWidths = true;
        }
        tf.setColWidths();

        let tblW;//initial table width
        if (tbl.width !== '') {
            tblW = tbl.width;
        }
        else if (tbl.style.width !== '') {
            tblW = parseInt(tbl.style.width, 10);
        } else {
            tblW = tbl.clientWidth;
        }

        //Main container: it will contain all the elements
        this.tblMainCont = createElm('div',
            ['id', this.prfxMainTblCont + tf.id]);
        this.tblMainCont.className = this.gridMainContCssClass;
        if (this.gridWidth) {
            this.tblMainCont.style.width = this.gridWidth;
        }
        tbl.parentNode.insertBefore(this.tblMainCont, tbl);

        //Table container: div wrapping content table
        this.tblCont = createElm('div', ['id', this.prfxTblCont + tf.id]);
        this.tblCont.className = this.gridContCssClass;
        if (this.gridWidth) {
            if (this.gridWidth.indexOf('%') !== -1) {
                this.tblCont.style.width = '100%';
            } else {
                this.tblCont.style.width = this.gridWidth;
            }
        }
        if (this.gridHeight) {
            this.tblCont.style.height = this.gridHeight;
        }
        tbl.parentNode.insertBefore(this.tblCont, tbl);
        let t = removeElm(tbl);
        this.tblCont.appendChild(t);

        //In case table width is expressed in %
        if (tbl.style.width === '') {
            tbl.style.width = (contains('%', tblW) ?
                tbl.clientWidth : tblW) + 'px';
        }

        let d = removeElm(this.tblCont);
        this.tblMainCont.appendChild(d);

        //Headers table container: div wrapping headers table
        this.headTblCont = createElm(
            'div', ['id', this.prfxHeadTblCont + tf.id]);
        this.headTblCont.className = this.gridHeadContCssClass;
        if (this.gridWidth) {
            if (this.gridWidth.indexOf('%') !== -1) {
                this.headTblCont.style.width = '100%';
            } else {
                this.headTblCont.style.width = this.gridWidth;
            }
        }

        //Headers table
        this.headTbl = createElm('table', ['id', this.prfxHeadTbl + tf.id]);
        let tH = createElm('tHead');

        //1st row should be headers row, ids are added if not set
        //Those ids are used by the sort feature
        let hRow = tbl.rows[this.gridHeadRowIndex];
        let sortTriggers = [];
        for (let n = 0; n < tf.nbCells; n++) {
            let c = hRow.cells[n];
            let thId = c.getAttribute('id');
            if (!thId || thId === '') {
                thId = this.prfxGridTh + n + '_' + tf.id;
                c.setAttribute('id', thId);
            }
            sortTriggers.push(thId);
        }

        //Filters row is created
        let filtersRow = createElm('tr');
        if (this.gridEnableFilters && tf.fltGrid) {
            tf.externalFltTgtIds = [];
            for (let j = 0; j < tf.nbCells; j++) {
                let fltTdId = tf.prfxFlt + j + this.prfxGridFltTd + tf.id;
                let cl = createElm(tf.fltCellTag, ['id', fltTdId]);
                filtersRow.appendChild(cl);
                tf.externalFltTgtIds[j] = fltTdId;
            }
        }

        //Headers row are moved from content table to headers table
        if (!this.noHeaders) {
            for (let i = 0; i < this.gridHeadRows.length; i++) {
                let headRow = tbl.rows[this.gridHeadRows[0]];
                tH.appendChild(headRow);
            }
        } else {
            // Handle table with no headers, assuming here headers do not
            // exist
            tH.appendChild(createElm('tr'));
        }

        this.headTbl.appendChild(tH);
        if (tf.filtersRowIndex === 0) {
            tH.insertBefore(filtersRow, hRow);
        } else {
            tH.appendChild(filtersRow);
        }

        this.headTblCont.appendChild(this.headTbl);
        this.tblCont.parentNode.insertBefore(this.headTblCont, this.tblCont);

        //THead needs to be removed in content table for sort feature
        let thead = tag(tbl, 'thead');
        if (thead.length > 0) {
            tbl.removeChild(thead[0]);
        }

        //Headers table style
        this.headTbl.style.tableLayout = 'fixed';
        tbl.style.tableLayout = 'fixed';
        this.headTbl.cellPadding = tbl.cellPadding;
        this.headTbl.cellSpacing = tbl.cellSpacing;
        // this.headTbl.style.width = tbl.style.width;

        //content table without headers needs col widths to be reset
        tf.setColWidths(this.headTbl);

        //Headers container width
        // this.headTblCont.style.width = this.tblCont.clientWidth+'px';

        tbl.style.width = '';
        //
        this.headTbl.style.width = tbl.clientWidth + 'px';
        //

        //scroll synchronisation
        Event.add(this.tblCont, 'scroll', (evt) => {
            let elm = Event.target(evt);
            let scrollLeft = elm.scrollLeft;
            this.headTblCont.scrollLeft = scrollLeft;
            //New pointerX calc taking into account scrollLeft
            // if(!o.isPointerXOverwritten){
            //     try{
            //         o.Evt.pointerX = function(evt){
            //             let e = evt || global.event;
            //             let bdScrollLeft = tf_StandardBody().scrollLeft +
            //                 scrollLeft;
            //             return (e.pageX + scrollLeft) ||
            //                 (e.clientX + bdScrollLeft);
            //         };
            //         o.isPointerXOverwritten = true;
            //     } catch(err) {
            //         o.isPointerXOverwritten = false;
            //     }
            // }
        });

        //Configure sort extension if any
        let sort = (f.extensions || []).filter(function (itm) {
            return itm.name === 'sort';
        });
        if (sort.length === 1) {
            sort[0].async_sort = true;
            sort[0].trigger_ids = sortTriggers;
        }

        //Cols generation for all browsers excepted IE<=7
        this.tblHasColTag = tag(tbl, 'col').length > 0 ? true : false;

        //Col elements are enough to keep column widths after sorting and
        //filtering
        let createColTags = function () {
            for (let k = (tf.nbCells - 1); k >= 0; k--) {
                let col = createElm('col', ['id', tf.id + '_col_' + k]);
                tbl.insertBefore(col, tbl.firstChild);
                col.style.width = tf.colWidths[k];
                this.gridColElms[k] = col;
            }
            this.tblHasColTag = true;
        };

        if (!this.tblHasColTag) {
            createColTags.call(this);
        } else {
            let cols = tag(tbl, 'col');
            for (let ii = 0; ii < tf.nbCells; ii++) {
                cols[ii].setAttribute('id', tf.id + '_col_' + ii);
                cols[ii].style.width = tf.colWidths[ii];
                this.gridColElms.push(cols[ii]);
            }
        }

        let afterColResizedFn = isFn(f.on_after_col_resized) ?
            f.on_after_col_resized : null;
        f.on_after_col_resized = function (o, colIndex) {
            if (!colIndex) {
                return;
            }
            let w = o.crWColsRow.cells[colIndex].style.width;
            let col = o.gridColElms[colIndex];
            col.style.width = w;

            let thCW = o.crWColsRow.cells[colIndex].clientWidth;
            let tdCW = o.crWRowDataTbl.cells[colIndex].clientWidth;

            if (thCW !== tdCW) {
                o.headTbl.style.width = tbl.clientWidth + 'px';
            }

            if (afterColResizedFn) {
                afterColResizedFn.call(null, o, colIndex);
            }
        };

        if (tf.popupFilters) {
            filtersRow.style.display = NONE;
        }

        if (tbl.clientWidth !== this.headTbl.clientWidth) {
            tbl.style.width = this.headTbl.clientWidth + 'px';
        }

        this.initialized = true;
    }

    /**
     * Removes the grid layout
     */
    destroy() {
        let tf = this.tf;
        let tbl = tf.tbl;

        if (!this.initialized) {
            return;
        }
        let t = removeElm(tbl);
        this.tblMainCont.parentNode.insertBefore(t, this.tblMainCont);
        removeElm(this.tblMainCont);

        this.tblMainCont = null;
        this.headTblCont = null;
        this.headTbl = null;
        this.tblCont = null;

        tbl.outerHTML = this.sourceTblHtml;
        //needed to keep reference of table element for future usage
        this.tf.tbl = id(tf.id);

        this.initialized = false;
    }
}