/**
 * cli:scaffold-tests — validate.ts
 *
 * validate() returns the Zod-PARSED spec (`data`): the semantic checks and
 * generate() both run on it, never on the raw JSON. `businessRules`,
 * `tenantMode`, `fields[].required` and `hasCreate` only exist after parse —
 * the raw business spec without `businessRules` died on `.length` with a
 * stack trace on stdout (2026-09-24, lot 13 / D4).
 */
import { ScaffoldTestsInputSchema, type ScaffoldTestsInput, type ValidationResult } from './types.js'
import { existsSync } from 'node:fs'

export function validateStructure(raw: unknown): ValidationResult {
  const result = ScaffoldTestsInputSchema.safeParse(raw)
  if (result.success) return { valid: true, errors: [], warnings: [], data: result.data }
  const errors = result.error.issues.map(i => `[${i.path.join('.')}] ${i.message}`)
  return { valid: false, errors, warnings: [] }
}

/** Semantic checks on the PARSED spec (defaults applied) — never on the raw JSON. */
export function validateBusinessRules(spec: ScaffoldTestsInput): ValidationResult {
  const errors: string[] = []
  const warnings: string[] = []

  if (!existsSync(spec.projectPath)) {
    errors.push(`Project path not found: ${spec.projectPath}`)
  }

  if (spec.layer === 'business' && spec.businessRules.length === 0) {
    warnings.push('No business rules provided — only validator tests will be generated')
  }

  return errors.length === 0
    ? { valid: true, errors, warnings, data: spec }
    : { valid: false, errors, warnings }
}

export function validate(raw: unknown): ValidationResult {
  const structural = validateStructure(raw)
  if (!structural.valid || structural.data === undefined) return structural
  return validateBusinessRules(structural.data)
}