import type { ClassifiedError } from '../../shared/types'

// Why: gh CLI surfaces API errors as unstructured stderr. Map known
// patterns to typed errors so callers can show user-friendly messages.
export function classifyGhError(stderr: string): ClassifiedError {
  const s = stderr.toLowerCase()
  // Why: primary rate-limit errors also carry "HTTP 403" — check rate limit
  // first so they don't misclassify as a token-scope problem.
  if (s.includes('rate limit')) {
    return {
      type: 'rate_limited',
      message: 'GitHub rate limit hit. Try again in a few minutes.'
    }
  }
  if (s.includes('http 403') || s.includes('resource not accessible')) {
    return {
      type: 'permission_denied',
      message: "You don't have permission to edit this issue. Check your GitHub token scopes."
    }
  }
  if (s.includes('http 404') || s.includes('could not resolve to a repository')) {
    return { type: 'not_found', message: 'Issue not found — it may have been deleted.' }
  }
  if (s.includes('has disabled issues')) {
    return { type: 'issues_disabled', message: 'Issues are disabled on this repository.' }
  }
  if (s.includes('http 422') || s.includes('validation failed')) {
    return { type: 'validation_error', message: `Invalid update — ${stderr.trim()}` }
  }
  if (
    s.includes('timeout') ||
    s.includes('no such host') ||
    s.includes('network') ||
    s.includes('could not resolve host')
  ) {
    return { type: 'network_error', message: 'Network error — check your connection.' }
  }
  return { type: 'unknown', message: `Failed to update issue: ${stderr.trim()}` }
}

// Why: classifyGhError's copy is phrased for edit/update operations, but
// listIssues is a read op and renderer banners interpolate the message.
export function classifyListIssuesError(stderr: string): ClassifiedError {
  const c = classifyGhError(stderr)
  const trimmed = stderr.trim()
  const readMessages: Record<ClassifiedError['type'], string> = {
    permission_denied:
      "You don't have permission to read issues for this repository. Check your GitHub token scopes.",
    not_found: 'Repository not found.',
    issues_disabled: 'Issues are disabled on this repository.',
    validation_error: `Invalid request — ${trimmed}`,
    rate_limited: 'GitHub rate limit hit. Try again in a few minutes.',
    network_error: 'Network error — check your connection.',
    unknown: `Failed to load issues: ${trimmed}`
  }
  return { type: c.type, message: readMessages[c.type] }
}

// Why: PR-side list failures need the same read-op classification — pagination
// decisions key on the type, and swallowing them made failures look like
// end-of-data (#11485).
export function classifyListPrsError(stderr: string): ClassifiedError {
  const c = classifyGhError(stderr)
  return { type: c.type, message: `Failed to load pull requests: ${stderr.trim()}` }
}