import { addMonthsYmd } from '@/utils/oa-confirmation-date'
import {
  CONFIRMATION_KIT_FIELD_DEFS,
  type ConfirmationKitFieldKey
} from '@/utils/oa-confirmation-kit-rule'
import { resolveCurrentOwnerDept } from '@/utils/oa-owner-field-defaults'

export const CONFIRMATION_MANUAL_PREFIX = '__manual_'

export type ConfirmationKitBinding = {
  fields: Partial<Record<ConfirmationKitFieldKey, string>>
  visible: Record<ConfirmationKitFieldKey, boolean>
  confirmationDateField?: string
  hireDateField?: string
  probationMonthsField?: string
}

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)
    const children = r.children
    if (Array.isArray(children)) {
      walk(
        children.filter((c) => c && typeof c === 'object') as Record<string, unknown>[],
        out
      )
    }
    const props = r.props as Record<string, unknown> | undefined
    if (props && Array.isArray(props.rule)) {
      walk(
        props.rule.filter((c) => c && typeof c === 'object') as Record<string, unknown>[],
        out
      )
    }
  }
}

function kitChildren(kit: Record<string, unknown>): Record<string, any>[] {
  const props = (kit.props && typeof kit.props === 'object' ? kit.props : {}) as Record<
    string,
    any
  >
  if (Array.isArray(kit.children)) return kit.children as any
  if (Array.isArray(props.rule)) return props.rule as any
  return []
}

function resolveBinding(kit: Record<string, unknown>): ConfirmationKitBinding {
  const props = (kit.props && typeof kit.props === 'object' ? kit.props : {}) as Record<
    string,
    any
  >
  const fields: Partial<Record<ConfirmationKitFieldKey, string>> = {}
  const propFieldMap: Record<string, ConfirmationKitFieldKey> = {
    hireDateField: 'hireDate',
    probationMonthsField: 'probationMonths',
    confirmationDateField: 'confirmationDate',
    postField: 'post',
    jobLevelField: 'jobLevel',
    nameField: 'name',
    emailField: 'email',
    deptField: 'dept',
    phoneField: 'phone'
  }
  for (const [propKey, sem] of Object.entries(propFieldMap)) {
    const f = props[propKey]
    if (f) fields[sem] = String(f)
  }

  for (const c of kitChildren(kit)) {
    if (!c?.field) continue
    const sem = String(c.props?._fc_kit_field || '') as ConfirmationKitFieldKey
    if (CONFIRMATION_KIT_FIELD_DEFS.some((d) => d.key === sem) && !fields[sem]) {
      fields[sem] = String(c.field)
    }
  }

  const visible = {} as Record<ConfirmationKitFieldKey, boolean>
  for (const d of CONFIRMATION_KIT_FIELD_DEFS) {
    const v = props[d.showProp]
    visible[d.key] = v === undefined || v === null ? true : !!v
  }

  return {
    fields,
    visible,
    confirmationDateField: fields.confirmationDate,
    hireDateField: fields.hireDate,
    probationMonthsField: fields.probationMonths
  }
}

export function listConfirmationKitBindings(schema: unknown): ConfirmationKitBinding[] {
  const flat: Record<string, unknown>[] = []
  walk(asRules(schema), flat)
  const out: ConfirmationKitBinding[] = []
  for (const r of flat) {
    if (String(r.type || '') !== 'confirmationKit') continue
    out.push(resolveBinding(r))
  }
  return out
}

function isEmptyValue(raw: unknown): boolean {
  if (raw == null || raw === '') return true
  if (Array.isArray(raw)) return raw.length === 0
  if (typeof raw === 'object') {
    const o = raw as Record<string, unknown>
    return !String(o.id || '').trim()
  }
  return false
}

/** 按 show* props 同步子字段 hidden，并去掉隐藏字段的前端必填 */
export function ensureConfirmationKitVisibility(rules: unknown): any[] {
  if (!Array.isArray(rules)) return []
  return rules.map((raw) => {
    if (!raw || typeof raw !== 'object') return raw
    const rule: any = { ...(raw as object) }
    if (String(rule.type || '') === 'confirmationKit') {
      const binding = resolveBinding(rule)
      const patchChildren = (list: any[]): any[] =>
        list.map((c) => {
          if (!c || typeof c !== 'object') return c
          const child: any = { ...c }
          const sem = String(child.props?._fc_kit_field || '') as ConfirmationKitFieldKey
          const show =
            sem && CONFIRMATION_KIT_FIELD_DEFS.some((d) => d.key === sem)
              ? binding.visible[sem] !== false
              : true
          child.hidden = !show
          if (!show) {
            child.$required = false
            if (child.validate) child.validate = []
          }
          if (Array.isArray(child.children)) {
            child.children = patchChildren(child.children)
          }
          return child
        })
      if (Array.isArray(rule.children)) {
        rule.children = patchChildren(rule.children)
      }
      if (Array.isArray(rule.props?.rule)) {
        rule.props = {
          ...rule.props,
          rule: patchChildren(rule.props.rule)
        }
      }
    }
    if (Array.isArray(rule.children)) {
      rule.children = ensureConfirmationKitVisibility(rule.children)
    }
    if (Array.isArray(rule.props?.rule)) {
      rule.props = {
        ...rule.props,
        rule: ensureConfirmationKitVisibility(rule.props.rule)
      }
    }
    return rule
  })
}

export async function applyConfirmationKitDefaults(
  schema: unknown,
  formData: Record<string, unknown>,
  user: Record<string, unknown> | null | undefined
): Promise<Record<string, unknown>> {
  const data = { ...formData }
  const kits = listConfirmationKitBindings(schema)
  if (!kits.length || !user) return data

  const name = String(user.realName || user.nickName || user.userName || '').trim()
  const email = String(user.email || '').trim()
  const phone = String(user.phone || user.phoneNo || '').trim()
  const hireDate = String(user.hireDate || '').trim()
  const probationRaw = user.probationMonths
  const probationMonths =
    probationRaw === null || probationRaw === undefined || probationRaw === ''
      ? null
      : Number(probationRaw)

  const dept = await resolveCurrentOwnerDept(user as any)

  for (const kit of kits) {
    const setIfEmpty = (sem: ConfirmationKitFieldKey, value: unknown) => {
      const field = kit.fields[sem]
      if (!field) return
      if (!isEmptyValue(data[field])) return
      if (value === null || value === undefined || value === '') return
      data[field] = value
    }

    setIfEmpty('hireDate', hireDate || null)
    if (probationMonths !== null && Number.isFinite(probationMonths) && probationMonths >= 0) {
      setIfEmpty('probationMonths', Math.trunc(probationMonths))
    }
    setIfEmpty('name', name || null)
    setIfEmpty('email', email || null)
    setIfEmpty('phone', phone || null)
    if (dept) setIfEmpty('dept', dept)

    const confField = kit.confirmationDateField
    const hireField = kit.hireDateField
    const probField = kit.probationMonthsField
    if (confField && isEmptyValue(data[confField]) && hireField && probField) {
      const suggested = addMonthsYmd(
        String(data[hireField] || ''),
        Number(data[probField])
      )
      if (suggested) data[confField] = suggested
    }
  }
  return data
}

export function applyConfirmationKitDateLinkage(
  schema: unknown,
  formData: Record<string, unknown>
): { data: Record<string, unknown>; changed: boolean } {
  const data = { ...formData }
  let changed = false
  for (const kit of listConfirmationKitBindings(schema)) {
    const confField = kit.confirmationDateField
    const hireField = kit.hireDateField
    const probField = kit.probationMonthsField
    if (!confField || !hireField || !probField) continue
    if (data[CONFIRMATION_MANUAL_PREFIX + confField]) continue
    const suggested = addMonthsYmd(String(data[hireField] || ''), Number(data[probField]))
    if (suggested == null) continue
    if (data[confField] !== suggested) {
      data[confField] = suggested
      changed = true
    }
  }
  return { data, changed }
}

export function markConfirmationDateManual(
  formData: Record<string, unknown>,
  confirmationDateField: string,
  manual = true
) {
  const data = { ...formData }
  const key = CONFIRMATION_MANUAL_PREFIX + confirmationDateField
  if (manual) data[key] = true
  else delete data[key]
  return data
}

export function clearConfirmationDateManualAndRelink(
  schema: unknown,
  formData: Record<string, unknown>,
  confirmationDateField: string
) {
  let data = markConfirmationDateManual(formData, confirmationDateField, false)
  const linked = applyConfirmationKitDateLinkage(schema, data)
  return linked.data
}

export function listManualConfirmationDateFields(schema: unknown, formData: Record<string, unknown>) {
  return listConfirmationKitBindings(schema)
    .map((k) => k.confirmationDateField)
    .filter((f): f is string => !!f && !!formData[CONFIRMATION_MANUAL_PREFIX + f])
}

export function isConfirmationDateField(schema: unknown, field: string): boolean {
  return listConfirmationKitBindings(schema).some((k) => k.confirmationDateField === field)
}

export function findConfirmationKitByHireOrProbation(
  schema: unknown,
  field: string
): ConfirmationKitBinding | null {
  return (
    listConfirmationKitBindings(schema).find(
      (k) => k.hireDateField === field || k.probationMonthsField === field
    ) || null
  )
}