'use strict';
describe('Page Up/Down', function () {
  beforeEach(function (cb) {
    helper.newPad({
      cb: async () => {
        await helper.clearPad();
        // 200 lines
        await helper.edit(
            '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n');
        cb();
      },
    });
  });

  // scrolls up 3 times
  it('scrolls up on key stroke', async function () {
    let currentLineNumber = helper.caretLineNumber();
    helper.pageUp();
    await helper.waitForPromise(() => currentLineNumber > helper.caretLineNumber());

    currentLineNumber = helper.caretLineNumber();
    helper.pageUp();
    await helper.waitForPromise(() => currentLineNumber > helper.caretLineNumber());

    currentLineNumber = helper.caretLineNumber();
    helper.pageUp();
    await helper.waitForPromise(() => currentLineNumber > helper.caretLineNumber());
  });

  // scrolls down 3 times
  it('scrolls down on key stroke', async function () {
    // this places the caret in the first line
    await helper.edit('Line 1', 1);

    let currentLineNumber = helper.caretLineNumber();
    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());

    currentLineNumber = helper.caretLineNumber();
    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());

    currentLineNumber = helper.caretLineNumber();
    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());
  });
});
describe('Page Up/Down Beginning and End position', function () {
  beforeEach(function (cb) {
    helper.newPad({
      cb: async () => {
        await helper.clearPad();
        // 200 lines
        await helper.edit(
            '\n\n\n\nhello');
        cb();
      },
    });
  });

  it('scrolls to very end content on page down when viewport is at bottom of document', async function () {
    // this places the caret in the first line
    await helper.edit('Line 1', 1);

    const currentLineNumber = helper.caretLineNumber();
    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());

    // make sure caret is after hello
    const pos = helper.padInner$.document.getSelection();
    await helper.waitForPromise(() => pos.anchorOffset > 0);
  });

  // scrolls down 3 times - caret should be AFTER "hello
  it('scrolls to very beginning content on page up when viewport is at bottom of document', async function () {
    // this places the caret in the first line
    await helper.edit('Line 1', 1);

    const currentLineNumber = helper.caretLineNumber();
    helper.pageUp();
    await helper.waitForPromise(() => currentLineNumber > helper.caretLineNumber());

    // make sure caret is at 0 position
    const pos = helper.padInner$.document.getSelection();
    await helper.waitForPromise(() => pos.anchorOffset === 0);
  });
});
describe('Line number integrity is kept between page up/down', function () {
  beforeEach(function (cb) {
    helper.newPad({
      cb: async () => {
        await helper.clearPad();
        // 200 lines
        await helper.edit(
            '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n');
        cb();
      },
    });
  });

  const lineHistory = [];

  it('Page down three times to a given line, then page up and see if lines match', async function () {
    // this places the caret in the first line
    await helper.edit('Line 1', 1);

    const currentLineNumber = helper.caretLineNumber();
    lineHistory.push(helper.caretLineNumber());

    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());
    lineHistory.push(helper.caretLineNumber());

    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());
    lineHistory.push(helper.caretLineNumber());

    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());

    let futureLineNumber = helper.caretLineNumber();
    helper.pageUp();
    await helper.waitForPromise(() => futureLineNumber > helper.caretLineNumber());
    if (helper.caretLineNumber() !== lineHistory[lineHistory.length]) {
      throw new Error('Line History not being properly maintained');
    }
    lineHistory.pop();

    futureLineNumber = helper.caretLineNumber();
    helper.pageUp();
    await helper.waitForPromise(() => futureLineNumber > helper.caretLineNumber());
    if (helper.caretLineNumber() !== lineHistory[lineHistory.length]) {
      throw new Error('Line History not being properly maintained');
    }
  });
});
describe('X character offset integrity is kept between page up/down', function () {
  beforeEach(function (cb) {
    helper.newPad({
      cb: async () => {
        await helper.clearPad();
        // 200 lines
        await helper.edit(
            'hel\n\nhello\nhello\nhello\nhello\nhello\nhello\nhello\nhello\nhello\nhello\n' +
            '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
            '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
            'hel\nhello\nhello\nhello\nhello\nhello\nhello\nhello\nhello\nhello\nhello\n' +
            'hello\n\n\nhello\n\n\nhel\n\n\nhel\n\nhel\n\nhel\n\nhel\n\nhel\n\nhel\n\nhel');
        cb();
      },
    });
  });

  it('Page down with an offset of 3 and check we keep our x offset', async function () {
    // Consider this document..
    //   hello*
    //   world
    //   .
    //   .
    //   .
    //   BOO!

    // Hitting page down at the star point should put your caret after BOO!
    // Now consider that the empty lines are very long and the caret lands in them.
    // We respect the original x character offset and try to pass it forward.

    // this places the caret in the first line
    await helper.edit('xxx', 1); // caret is offset 6

    let currentLineNumber = helper.caretLineNumber();
    const nodeLength = helper.padInner$.document.getSelection().anchorNode.length;

    const originalOffset = helper.padInner$.document.getSelection().anchorOffset;

    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());
    await helper.waitForPromise(() => helper.padInner$.document.getSelection().anchorOffset === originalOffset ||
      !helper.padInner$.document.getSelection().anchorNode.length);
    // !helper.padInner$.document.getSelection().anchorNode.length) in the above line serves a useful purpose..
    // We use it to ensure character offset is respected on empty lines but also to check that it's continued
    // to be respected on next page downs.

    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());
    console.log(helper.padInner$.document.getSelection().anchorNode.length, 'WAT');
    await helper.waitForPromise(() => helper.padInner$.document.getSelection().anchorOffset === originalOffset ||
      !helper.padInner$.document.getSelection().anchorNode.length);

    helper.pageDown();
    await helper.waitForPromise(() => currentLineNumber < helper.caretLineNumber());
    await helper.waitForPromise(() => helper.padInner$.document.getSelection().anchorOffset === originalOffset ||
      !helper.padInner$.document.getSelection().anchorNode.length);

    // need to reset for page up
    currentLineNumber = helper.caretLineNumber();

    helper.pageUp();
    await helper.waitForPromise(() => currentLineNumber > helper.caretLineNumber());
    await helper.waitForPromise(() => helper.padInner$.document.getSelection().anchorOffset === originalOffset ||
      !helper.padInner$.document.getSelection().anchorNode.length);
  });
});

describe('Really long text line goes to character within text line if text line is last line in viewport', function () {
  beforeEach(function (cb) {
    helper.newPad({
      cb: async () => {
        await helper.clearPad();
        // 200 lines
        await helper.edit(
            'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world\n ' +
          'hello world hello world hello world hello world hello world hello world hello world ' +
          'hello world hello world hello world hello world hello world hello world hello world ');
        cb();
      },
    });
  });

  it('Page down on really long line keeps character on the same line but with a large X offset', async function () {
    await helper.edit('xxx', 1); // caret is offset 6
    await helper.waitForPromise(() => {
      if ((helper.padInner$.document.getSelection().anchorOffset === 0) && (helper.caretLineNumber() === 1)) {
        return true;
      } else {
        helper.pageUp();
      }
    });
    helper.pageDown();
    await helper.waitForPromise(() => {
      if ((helper.padInner$.document.getSelection().anchorOffset > 0) && (helper.caretLineNumber() === 1)) {
        throw new Error('This test will pass but it should not..   We need logic to check we were at the last possible caret');
        return true;
      }
    });
  });
});

describe('Viewport based Page Up/Down', function () {
  beforeEach(function (cb) {
    helper.newPad({
      cb: async () => {
        await helper.clearPad();
        // 200 lines
        await helper.edit(
            '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n' +
          '\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n');
        cb();
      },
    });
  });

  // scrolls up 3 times
  it('scrolls down on page down key stroke when top is at 0', async function () {
    // by default page down when caret is at end of the document will leave it in the same place.
    // viewport based pageup/down changes that
    const currentLineNumber = helper.caretLineNumber();
    helper.padOuter$('#outerdocbody').parent().scrollTop(100);
    helper.pageUp();
    await helper.waitForPromise(() => currentLineNumber < 5);
  });
});
describe('Shift Page Up/Down', function () {
  beforeEach(function (cb) {
    helper.newPad({
      cb: async () => {
        await helper.clearPad();
        // 200 lines
        await helper.edit('\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n');
        cb();
      },
    });
  });

  it('highlights multiple lines on shift page down', async function () {
    await helper.edit('xxx', 1); // caret is offset 6

    helper.pageUp();
    helper.pageDown({
      shift: true,
    });
    await helper.waitForPromise(() => helper.padInner$.document.getSelection().type === 'Range');
  });
});