import { LintConfig } from '../../types'
import { LineLintRule } from '../../types/LintRule'
import { LintRuleType } from '../../types/LintRuleType'
import { Severity } from '../../types/Severity'

const name = 'noTrailingSpaces'
const description = 'Disallow trailing spaces on lines.'
const message = 'Line contains trailing spaces'

const test = (value: string, lineNumber: number, config?: LintConfig) => {
  const severity = config?.severityLevel[name] || Severity.Warning

  return value.trimEnd() === value
    ? []
    : [
        {
          message,
          lineNumber,
          startColumnNumber: value.trimEnd().length + 1,
          endColumnNumber: value.length,
          severity
        }
      ]
}

const fix = (value: string) => value.trimEnd()

/**
 * Lint rule that checks for the presence of trailing space(s) in a given line of text.
 */
export const noTrailingSpaces: LineLintRule = {
  type: LintRuleType.Line,
  name,
  description,
  message,
  test,
  fix
}