const pdfMake = require('pdfmake/build/pdfmake.js');
const pdfFonts = require('pdfmake/build/vfs_fonts.js');
pdfMake.vfs = pdfFonts.pdfMake.vfs;

function table(course) {
    return {
        widths: [50, 200, 75, 50, 100],
        headerRows: 2,
        body: [
            [{text: `${course.code}\n${course.title}`, bold: true, colSpan: 5, alignment: 'center'}, {}, {}, {}, {}],
            [{text: 'Sección', bold: true}, {text: 'Profesor', bold: true}, {text: 'Lugar', bold: true}, {text: 'Días', bold: true}, {text: 'Horas', bold: true}],
        ].concat( course.sections.map( function(section) {
            var res = [section.code];
            if (section.hasOwnProperty('professors')) {
                res = res.concat( section.professors.reduce( function (acc, professor) {
                    return  ((acc === '') ? '' : acc + '\n') + professor.first_name + ' ' + professor.last_name;
                }, ''));
            } else {
                res = res.concat('');
            }
            if (section.hasOwnProperty('schedules')) {
                res = res.concat( section.schedules.reduce( function (acc, schedule) {
                    return ((acc === '') ? '' : acc + '\n') + schedule.building + ' ' + schedule.room;
                }, ''));
                res = res.concat( section.schedules.reduce( function (acc, schedule) {
                    return ((acc === '') ? '' : acc + '\n') + schedule.days;
                }, ''));
                res = res.concat( section.schedules.reduce( function (acc, schedule) {
                    return ((acc === '') ? '' : acc + '\n') + schedule.time_start + '-' + schedule.time_end;
                }, ''));
            } else {
                res = res.concat(['', '', '']);
            }
            return res;
        }))
    }
}

var docDef = {
    content: [
        {text: `Horario ${data.dept.name} ${data.alpha}`, style: 'header'},
        {text: 'sujeto a cambios', style: 'header', fontSize: 18},
    ].concat( data.courses.map( function(course) {
        return {
            columns: [
                { width: '*', text: ''}, // Aligns table to center
                {
                    style: 'tableStyle',
                    alignment: 'center',
                    width: 'auto',
                    table: table(course)
                },
                { width: '*', text: ''}  // Aligns table to center
            ],
        };
    })),
    styles: {
        header: {
            fontSize: 22,
            bold: true,
            alignment: 'center',
        },
        tableStyle: {
            margin: [0,20,0,20]
        },
    },
    pageBreakBefore: function(currentNode, followingNodesOnPage, nodesOnNextPage, previousNodesOnPage) {
        var pageInnerHeight = currentNode.startPosition.pageInnerHeight;
        var top = (currentNode.startPosition.top) ? currentNode.startPosition.top : 0;
        var nodeHeight = 0; // Distance from top of table to top of next table
        if (followingNodesOnPage && followingNodesOnPage.length) {
            var nextTableNodeIndex = followingNodesOnPage.findIndex( function(n) { return n.table; })
            if (nextTableNodeIndex !== -1 && nextTableNodeIndex < followingNodesOnPage.length) {
                nodeHeight = followingNodesOnPage[nextTableNodeIndex].startPosition.top - top;
            }
        }
        // if (currentNode.table) {
        //     console.log(currentNode);
        //     console.log(currentNode.pageNumbers)
        //     console.log(currentNode.table.body[0][0].text);
        //     console.log('t ' + top);
        //     console.log('nh ' + nodeHeight);
        //     console.log('pih ' + pageInnerHeight);
        //     console.log((top + nodeHeight > pageInnerHeight));
        // }
        return (currentNode.table && (top + nodeHeight > pageInnerHeight))
            || currentNode.startPosition.verticalRatio >= 0.90;
    }

};

// console.log(docDef);
pdfMake.createPdf(docDef).download(data.alpha + '.pdf', function () { window.location.replace('/dashboard')});
// window.location.replace("/dashboard");