const TextEditor = require('../src/text-editor')

describe('Selection', () => {
  let buffer, editor, selection

  beforeEach(() => {
    buffer = atom.project.bufferForPathSync('sample.js')
    editor = new TextEditor({buffer, tabLength: 2})
    selection = editor.getLastSelection()
  })

  afterEach(() => buffer.destroy())

  describe('.deleteSelectedText()', () => {
    describe('when nothing is selected', () => {
      it('deletes nothing', () => {
        selection.setBufferRange([[0, 3], [0, 3]])
        selection.deleteSelectedText()
        expect(buffer.lineForRow(0)).toBe('var quicksort = function () {')
      })
    })

    describe('when one line is selected', () => {
      it('deletes selected text and clears the selection', () => {
        selection.setBufferRange([[0, 4], [0, 14]])
        selection.deleteSelectedText()
        expect(buffer.lineForRow(0)).toBe('var = function () {')

        const endOfLine = buffer.lineForRow(0).length
        selection.setBufferRange([[0, 0], [0, endOfLine]])
        selection.deleteSelectedText()
        expect(buffer.lineForRow(0)).toBe('')

        expect(selection.isEmpty()).toBeTruthy()
      })
    })

    describe('when multiple lines are selected', () => {
      it('deletes selected text and clears the selection', () => {
        selection.setBufferRange([[0, 1], [2, 39]])
        selection.deleteSelectedText()
        expect(buffer.lineForRow(0)).toBe('v;')
        expect(selection.isEmpty()).toBeTruthy()
      })
    })

    describe('when the cursor precedes the tail', () => {
      it('deletes selected text and clears the selection', () => {
        selection.cursor.setScreenPosition([0, 13])
        selection.selectToScreenPosition([0, 4])

        selection.delete()
        expect(buffer.lineForRow(0)).toBe('var  = function () {')
        expect(selection.isEmpty()).toBeTruthy()
      })
    })
  })

  describe('.isReversed()', () => {
    it('returns true if the cursor precedes the tail', () => {
      selection.cursor.setScreenPosition([0, 20])
      selection.selectToScreenPosition([0, 10])
      expect(selection.isReversed()).toBeTruthy()

      selection.selectToScreenPosition([0, 25])
      expect(selection.isReversed()).toBeFalsy()
    })
  })

  describe('.selectLine(row)', () => {
    describe('when passed a row', () => {
      it('selects the specified row', () => {
        selection.setBufferRange([[2, 4], [3, 4]])
        selection.selectLine(5)
        expect(selection.getBufferRange()).toEqual([[5, 0], [6, 0]])
      })
    })

    describe('when not passed a row', () => {
      it('selects all rows spanned by the selection', () => {
        selection.setBufferRange([[2, 4], [3, 4]])
        selection.selectLine()
        expect(selection.getBufferRange()).toEqual([[2, 0], [4, 0]])
      })
    })
  })

  describe("when only the selection's tail is moved (regression)", () => {
    it('notifies ::onDidChangeRange observers', () => {
      selection.setBufferRange([[2, 0], [2, 10]], {reversed: true})
      const changeScreenRangeHandler = jasmine.createSpy('changeScreenRangeHandler')
      selection.onDidChangeRange(changeScreenRangeHandler)

      buffer.insert([2, 5], 'abc')
      expect(changeScreenRangeHandler).toHaveBeenCalled()
    })
  })

  describe('when the selection is destroyed', () => {
    it('destroys its marker', () => {
      selection.setBufferRange([[2, 0], [2, 10]])
      const { marker } = selection
      selection.destroy()
      expect(marker.isDestroyed()).toBeTruthy()
    })
  })

  describe('.insertText(text, options)', () => {
    it('allows pasting white space only lines when autoIndent is enabled', () => {
      selection.setBufferRange([[0, 0], [0, 0]])
      selection.insertText('    \n    \n\n', {autoIndent: true})
      expect(buffer.lineForRow(0)).toBe('    ')
      expect(buffer.lineForRow(1)).toBe('    ')
      expect(buffer.lineForRow(2)).toBe('')
    })

    it('auto-indents if only a newline is inserted', () => {
      selection.setBufferRange([[2, 0], [3, 0]])
      selection.insertText('\n', {autoIndent: true})
      expect(buffer.lineForRow(2)).toBe('  ')
    })

    it('auto-indents if only a carriage return + newline is inserted', () => {
      selection.setBufferRange([[2, 0], [3, 0]])
      selection.insertText('\r\n', {autoIndent: true})
      expect(buffer.lineForRow(2)).toBe('  ')
    })

    it('does not adjust the indent of trailing lines if preserveTrailingLineIndentation is true', () => {
      selection.setBufferRange([[5, 0], [5, 0]])
      selection.insertText('      foo\n    bar\n', {preserveTrailingLineIndentation: true, indentBasis: 1})
      expect(buffer.lineForRow(6)).toBe('    bar')
    })
  })

  describe('.fold()', () => {
    it('folds the buffer range spanned by the selection', () => {
      selection.setBufferRange([[0, 3], [1, 6]])
      selection.fold()

      expect(selection.getScreenRange()).toEqual([[0, 4], [0, 4]])
      expect(selection.getBufferRange()).toEqual([[1, 6], [1, 6]])
      expect(editor.lineTextForScreenRow(0)).toBe(`var${editor.displayLayer.foldCharacter}sort = function(items) {`)
      expect(editor.isFoldedAtBufferRow(0)).toBe(true)
    })

    it("doesn't create a fold when the selection is empty", () => {
      selection.setBufferRange([[0, 3], [0, 3]])
      selection.fold()

      expect(selection.getScreenRange()).toEqual([[0, 3], [0, 3]])
      expect(selection.getBufferRange()).toEqual([[0, 3], [0, 3]])
      expect(editor.lineTextForScreenRow(0)).toBe('var quicksort = function () {')
      expect(editor.isFoldedAtBufferRow(0)).toBe(false)
    })
  })

  describe('within a read-only editor', () => {
    beforeEach(() => {
      editor.setReadOnly(true)
      selection.setBufferRange([[0, 0], [0, 13]])
    })

    const modifications = [
      {
        name: 'insertText',
        op: opts => selection.insertText('yes', opts)
      },
      {
        name: 'backspace',
        op: opts => selection.backspace(opts)
      },
      {
        name: 'deleteToPreviousWordBoundary',
        op: opts => selection.deleteToPreviousWordBoundary(opts)
      },
      {
        name: 'deleteToNextWordBoundary',
        op: opts => selection.deleteToNextWordBoundary(opts)
      },
      {
        name: 'deleteToBeginningOfWord',
        op: opts => selection.deleteToBeginningOfWord(opts)
      },
      {
        name: 'deleteToBeginningOfLine',
        op: opts => selection.deleteToBeginningOfLine(opts)
      },
      {
        name: 'delete',
        op: opts => selection.delete(opts)
      },
      {
        name: 'deleteToEndOfLine',
        op: opts => selection.deleteToEndOfLine(opts)
      },
      {
        name: 'deleteToEndOfWord',
        op: opts => selection.deleteToEndOfWord(opts)
      },
      {
        name: 'deleteToBeginningOfSubword',
        op: opts => selection.deleteToBeginningOfSubword(opts)
      },
      {
        name: 'deleteToEndOfSubword',
        op: opts => selection.deleteToEndOfSubword(opts)
      },
      {
        name: 'deleteSelectedText',
        op: opts => selection.deleteSelectedText(opts)
      },
      {
        name: 'deleteLine',
        op: opts => selection.deleteLine(opts)
      },
      {
        name: 'joinLines',
        op: opts => selection.joinLines(opts)
      },
      {
        name: 'outdentSelectedRows',
        op: opts => selection.outdentSelectedRows(opts)
      },
      {
        name: 'autoIndentSelectedRows',
        op: opts => selection.autoIndentSelectedRows(opts)
      },
      {
        name: 'toggleLineComments',
        op: opts => selection.toggleLineComments(opts)
      },
      {
        name: 'cutToEndOfLine',
        op: opts => selection.cutToEndOfLine(false, opts)
      },
      {
        name: 'cutToEndOfBufferLine',
        op: opts => selection.cutToEndOfBufferLine(false, opts)
      },
      {
        name: 'cut',
        op: opts => selection.cut(false, false, opts.bypassReadOnly)
      },
      {
        name: 'indent',
        op: opts => selection.indent(opts)
      },
      {
        name: 'indentSelectedRows',
        op: opts => selection.indentSelectedRows(opts)
      },
    ]

    describe('without bypassReadOnly', () => {
      for (const {name, op} of modifications) {
        it(`throws an error on ${name}`, () => {
          expect(op).toThrow()
        })
      }
    })

    describe('with bypassReadOnly', () => {
      for (const {name, op} of modifications) {
        it(`permits ${name}`, () => {
          op({bypassReadOnly: true})
        })
      }
    })
  })
})