/**
 * cli:publish-api-contract — validate.ts
 */
import { existsSync } from 'node:fs'
import { resolve } from 'node:path'
import { PublishApiContractInputSchema, type ValidationResult } from './types.js'

export function validate(raw: unknown): ValidationResult {
  const parsed = PublishApiContractInputSchema.safeParse(raw)
  if (!parsed.success) {
    return {
      valid: false,
      errors: parsed.error.issues.map(i => `[${i.path.join('.')}] ${i.message}`),
      warnings: [],
    }
  }

  const spec = parsed.data
  const errors: string[] = []
  const warnings: string[] = []

  if (!existsSync(resolve(spec.projectPath))) {
    errors.push(`projectPath does not exist: ${spec.projectPath}`)
  }
  if (spec.allowBreaking && spec.mode === 'write') {
    warnings.push('allowBreaking is set: a change that breaks an existing integration will be published under the SAME version. Only do this when nobody consumes the contract yet.')
  }
  if (spec.baseUrl.includes('{host}')) {
    warnings.push('baseUrl still carries the {host} placeholder — the third party cannot call the API from the contract as published.')
  }

  return { valid: errors.length === 0, errors, warnings }
}