import type { LocalSymbol, SourceRange } from './contract'
import { describe, expect, it } from 'vitest'
import { definitionFor, symbolAt, symbolOccurrences } from './localSymbols'

function range(startIndex: number, endIndex: number): SourceRange {
  return { startIndex, endIndex }
}

// out=1（0-3）；echo $out（10-13）；out=2（15-18）；echo $out（25-28）
const OUT: LocalSymbol = { definitions: [range(0, 3), range(15, 18)], occurrences: [range(0, 3), range(10, 13), range(15, 18), range(25, 28)] }
const URL: LocalSymbol = { definitions: [range(40, 43)], occurrences: [range(30, 33), range(40, 43)] }

describe('语言插件认出的同一文件里的名字', () => {
  it('找盖住位置的名字；名字外面没有', () => {
    expect(symbolAt([URL, OUT], 11)).toBe(OUT)
    expect(symbolAt([URL, OUT], 13)).toBeUndefined()
  })

  it('跳到之前最近的一处定义；前面没有定义就跳到第一处', () => {
    expect(definitionFor(OUT, 11)).toEqual(range(0, 3))
    expect(definitionFor(OUT, 26)).toEqual(range(15, 18))
    expect(definitionFor(URL, 31)).toEqual(range(40, 43))
  })

  it('各处出现：定义处算写，别处算读', () => {
    expect(symbolOccurrences(OUT)).toEqual([
      { start: 0, end: 3, kind: 'write' },
      { start: 10, end: 13, kind: 'read' },
      { start: 15, end: 18, kind: 'write' },
      { start: 25, end: 28, kind: 'read' },
    ])
  })
})