import { Position, NodeTypes } from '../src/ast'
import {
  getInnerRange,
  advancePositionWithClone,
  isEmptyExpression
} from '../src/utils'

function p(line: number, column: number, offset: number): Position {
  return { column, line, offset }
}

describe('advancePositionWithClone', () => {
  test('same line', () => {
    const pos = p(1, 1, 0)
    const newPos = advancePositionWithClone(pos, 'foo\nbar', 2)

    expect(newPos.column).toBe(3)
    expect(newPos.line).toBe(1)
    expect(newPos.offset).toBe(2)
  })

  test('same line', () => {
    const pos = p(1, 1, 0)
    const newPos = advancePositionWithClone(pos, 'foo\nbar', 4)

    expect(newPos.column).toBe(1)
    expect(newPos.line).toBe(2)
    expect(newPos.offset).toBe(4)
  })

  test('multiple lines', () => {
    const pos = p(1, 1, 0)
    const newPos = advancePositionWithClone(pos, 'foo\nbar\nbaz', 10)

    expect(newPos.column).toBe(3)
    expect(newPos.line).toBe(3)
    expect(newPos.offset).toBe(10)
  })
})

describe('getInnerRange', () => {
  const loc1 = {
    source: 'foo\nbar\nbaz',
    start: p(1, 1, 0),
    end: p(3, 3, 11)
  }

  test('at start', () => {
    const loc2 = getInnerRange(loc1, 0, 4)
    expect(loc2.start).toEqual(loc1.start)
    expect(loc2.end.column).toBe(1)
    expect(loc2.end.line).toBe(2)
    expect(loc2.end.offset).toBe(4)
  })

  test('at end', () => {
    const loc2 = getInnerRange(loc1, 4)
    expect(loc2.start.column).toBe(1)
    expect(loc2.start.line).toBe(2)
    expect(loc2.start.offset).toBe(4)
    expect(loc2.end).toEqual(loc1.end)
  })

  test('in between', () => {
    const loc2 = getInnerRange(loc1, 4, 3)
    expect(loc2.start.column).toBe(1)
    expect(loc2.start.line).toBe(2)
    expect(loc2.start.offset).toBe(4)
    expect(loc2.end.column).toBe(4)
    expect(loc2.end.line).toBe(2)
    expect(loc2.end.offset).toBe(7)
  })
})

describe('isEmptyExpression', () => {
  test('empty', () => {
    expect(
      isEmptyExpression({
        content: '',
        type: NodeTypes.SIMPLE_EXPRESSION,
        isStatic: true,
        loc: null as any
      })
    ).toBe(true)
  })

  test('spaces', () => {
    expect(
      isEmptyExpression({
        content: '  \t  ',
        type: NodeTypes.SIMPLE_EXPRESSION,
        isStatic: true,
        loc: null as any
      })
    ).toBe(true)
  })

  test('identifier', () => {
    expect(
      isEmptyExpression({
        content: 'foo',
        type: NodeTypes.SIMPLE_EXPRESSION,
        isStatic: true,
        loc: null as any
      })
    ).toBe(false)
  })
})