import type { LintResult } from './diagnostic.js'

export type LintReportFormat = 'json' | 'stylish'

export function formatLintResult(result: LintResult, format: LintReportFormat = 'stylish'): string {
  if (format === 'json') return `${JSON.stringify(result, null, 2)}\n`
  const lines: string[] = []
  for (const diagnostic of result.diagnostics) {
    const location = diagnostic.location
      ? `${diagnostic.location.path}:${diagnostic.location.line}:${diagnostic.location.column}`
      : result.root
    lines.push(`${location}  ${diagnostic.severity} ${diagnostic.id}  ${diagnostic.message}`)
    if (diagnostic.help) lines.push(`  ${diagnostic.help}`)
  }

  const errors = result.diagnostics.filter((diagnostic) => diagnostic.severity === 'error').length
  const warnings = result.diagnostics.length - errors
  if (lines.length > 0) lines.push('')
  lines.push(
    errors === 0
      ? `\u2713 ${result.files} files linted in ${result.durationMs}ms${warnings ? ` (${warnings} warnings)` : ''}`
      : `\u2717 ${errors} ${errors === 1 ? 'error' : 'errors'}, ${warnings} ${warnings === 1 ? 'warning' : 'warnings'} in ${result.durationMs}ms`,
  )
  return `${lines.join('\n')}\n`
}