/**
 * cli:extract-doc — validate.ts
 *
 * Structural Zod validation + a non-blocking sanity check that the project
 * path exists. Never blocks on missing layers (Domain/Api/web): extraction
 * degrades gracefully and reports what it could not find as warnings, so a
 * partially-scaffolded project still yields a useful report.
 */
import { existsSync } from 'node:fs'
import { ExtractDocInputSchema, type ValidationResult } from './types.js'

export function validate(raw: unknown): ValidationResult {
  const result = ExtractDocInputSchema.safeParse(raw)
  if (!result.success) {
    return {
      valid: false,
      errors: result.error.issues.map((i) => `[${i.path.join('.')}] ${i.message}`),
      warnings: [],
    }
  }
  if (!existsSync(result.data.projectPath)) {
    return {
      valid: false,
      errors: [`projectPath does not exist: ${result.data.projectPath}`],
      warnings: [],
    }
  }
  const warnings: string[] = []
  if (result.data.type === 'user' && !result.data.application) {
    warnings.push(
      'No `application` provided for a user-type doc — the namespace/route suggestions will omit the app prefix.',
    )
  }
  return { valid: true, errors: [], warnings }
}