const addLeftHeader = (
  doc: jsPDF,
  page: number,
  pages: number,
  date: string | null,
  type: string
) => {
  const addLine = (text: string, fontSize = 9) => {
    doc.text(text, leftPadding, currentLine, { charSpace: 0.75 });
    currentLine += fontSize;
  };

  let currentLine = 55;

  doc.setFontSize(9);
  doc.setFont(baseFont);

  addLine(`Page ${page} of ${pages}`);
  if (date) {
    addLine(`${type} Date: ${date}`);
  }

  doc.setFontStyle('bold');
  addLine('Remit to:');
  doc.setFontStyle('normal');

  addLine(`Linode, LLC`);
  addLine('249 Arch St.');
  addLine('Philadelphia, PA 19106');
  addLine('USA');
};

function test_font_types() {
    var doc = new jsPDF();
    doc.text(20, 20, 'This is the default font.');
    doc.setFont("courier");
    doc.text(20, 30, 'This is courier normal.');
    doc.setFont("times");
    doc.setFontType("italic");
    doc.text(20, 40, 'This is times italic.');
    doc.setFont("helvetica");
    doc.setFontType("bold");
    doc.text(20, 50, 'This is helvetica bold.');
    doc.setFont("courier");
    doc.setFontType("bolditalic");
    doc.text(20, 60, 'This is courier bolditalic.');
    doc.save('Test.pdf');
}

function test_split_text_to_size() {
    var doc = new jsPDF();
    doc.setFont("Courier");

    doc.getTextWidth("Lorem Ipsum");
    doc.getStringUnitWidth("Lorem Ipsum");
    doc.getCharWidthsArray("Lorem Ipsum");
    doc.splitTextToSize("Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua.", 100);

}

function test_font_metrics_based_line_sizing_split() {
    var pdf = new jsPDF('p', 'in', 'letter');
    var sizes:number[] = [12, 16, 20];
    var fonts = [['Times', 'Roman'], ['Helvetica', ''], ['Times', 'Italic']];
    var font:string[];
    var size:number;
    var lines:any[];
    var verticalOffset = 0.5; // inches on a 8.5 x 11 inch sheet.
    var loremipsum = 'Lorem ipsum dolor sit amet, ...';
    for (var i in fonts) {
        if (fonts.hasOwnProperty(i)) {
            font = fonts[i];
            size = sizes[i];
            lines = pdf.setFont(font[0], font[1])
                .setFontSize(size)
                .splitTextToSize(loremipsum, 7.5);
            pdf.text(0.5, verticalOffset + size / 72, lines);
            verticalOffset += (lines.length + 0.5) * size / 72
        }
    }
    pdf.save('Test.pdf');
}

function test_font() {
    var doc = new jsPDF();
    doc.text('This is the default font.',20, 20);
    doc.setFont("courier");
}