/** 离职套件运行时：入职日期默认申请人 */

function asRules(schema: unknown): Record<string, unknown>[] {
  if (Array.isArray(schema)) return schema.filter((r) => r && typeof r === 'object') as any
  if (schema && typeof schema === 'object') {
    const s = schema as any
    const rules = s.rule || s.rules || s.fields
    if (Array.isArray(rules)) return rules.filter((r: any) => r && typeof r === 'object')
    if (s.type || s.field) return [s]
  }
  return []
}

function walk(rules: Record<string, unknown>[], out: Record<string, unknown>[]) {
  for (const r of rules) {
    out.push(r)
    if (Array.isArray(r.children)) {
      walk(r.children as any, out)
    }
    const props = r.props as any
    if (props && Array.isArray(props.rule)) walk(props.rule, out)
  }
}

export type ResignationKitBinding = {
  hireDateField?: string
  lastWorkDayField?: string
}

function resolveBinding(kit: Record<string, unknown>): ResignationKitBinding {
  const props = (kit.props && typeof kit.props === 'object' ? kit.props : {}) as Record<
    string,
    any
  >
  let hireDateField = props.hireDateField ? String(props.hireDateField) : undefined
  let lastWorkDayField = props.lastWorkDayField ? String(props.lastWorkDayField) : undefined
  const children = (
    Array.isArray(kit.children)
      ? kit.children
      : Array.isArray(props.rule)
        ? props.rule
        : []
  ) as Record<string, any>[]
  for (const c of children) {
    if (!c?.field) continue
    const sem = String(c.props?._fc_kit_field || '')
    if (sem === 'hireDate' && !hireDateField) hireDateField = String(c.field)
    if (sem === 'lastWorkDay' && !lastWorkDayField) lastWorkDayField = String(c.field)
  }
  return { hireDateField, lastWorkDayField }
}

export function listResignationKitBindings(schema: unknown): ResignationKitBinding[] {
  const flat: Record<string, unknown>[] = []
  walk(asRules(schema), flat)
  return flat
    .filter((r) => String(r.type || '') === 'resignationKit')
    .map(resolveBinding)
}

function isEmpty(raw: unknown): boolean {
  return raw == null || raw === ''
}

/** 仅对空入职日期写入申请人 hireDate */
export function applyResignationKitDefaults(
  schema: unknown,
  formData: Record<string, unknown>,
  user: Record<string, unknown> | null | undefined
): Record<string, unknown> {
  const data = { ...formData }
  if (!user) return data
  const hireDate = String(user.hireDate || '').trim()
  if (!hireDate) return data
  for (const kit of listResignationKitBindings(schema)) {
    const f = kit.hireDateField
    if (f && isEmpty(data[f])) data[f] = hireDate
  }
  return data
}