/**
 * 活动费用展示口径（A3「活动费用展示层口径统一」共用工具）
 *
 * 数据契约（A2，字段名与取值对齐 A2 的 ActivityDTO，A2 未合入期间取默认值降级）：
 *   audienceScope: 'all'（默认）| 'member_only'                         —— 是否仅会员可参加
 *   audienceType : 'adult'（默认）| 'include_child' | 'include_elder' | 'include_child_elder'
 *
 * 费用档位（A2 §2.1；长者复用成人价 —— D1 决策：不新增长者价格列）：
 *   成人·非会员 price        成人·会员 memberPrice
 *   儿童·非会员 childFee     儿童·会员 childMemberFee
 *
 * 兼容存量（A2 §2.4）：parentFee / parentMemberFee 降级为「成人非会员价」的历史别名
 *   成人非会员价 = price > 0 ? price : parentFee
 *   成人会员价   = memberPrice > 0 ? memberPrice : parentMemberFee
 * 老活动（只填 parent/parentMember 费用、price 为 0）在展示层仍要正确显示成人价。
 *
 * 注意：ActivityDTO.price 已被后端按会员等级解析（会员拿到 memberPrice），
 * memberPrice 仍是原始会员价。故本工具取"非会员列"用 price 优先 + parentFee 回落，
 * 取"会员列"用 memberPrice 优先 + parentMemberFee 回落。
 */

export const AUDIENCE_SCOPE_ALL = 'all'
export const AUDIENCE_SCOPE_MEMBER_ONLY = 'member_only'

export const AUDIENCE_TYPE_ADULT = 'adult'
export const AUDIENCE_TYPE_INCLUDE_CHILD = 'include_child'
export const AUDIENCE_TYPE_INCLUDE_ELDER = 'include_elder'
export const AUDIENCE_TYPE_INCLUDE_CHILD_ELDER = 'include_child_elder'

const VALID_AUDIENCE_TYPES = [
  AUDIENCE_TYPE_ADULT,
  AUDIENCE_TYPE_INCLUDE_CHILD,
  AUDIENCE_TYPE_INCLUDE_ELDER,
  AUDIENCE_TYPE_INCLUDE_CHILD_ELDER
]

export const IDENTITY_ADULT = 'adult'
export const IDENTITY_CHILD = 'child'
export const IDENTITY_ELDER = 'elder'

const IDENTITY_LABELS = { adult: '成人', child: '儿童', elder: '长者' }

/* eslint-disable no-restricted-globals */
export function num(value) {
  if (value === null || value === undefined || value === '') return 0
  var n = Number(value)
  return isNaN(n) ? 0 : n
}
/* eslint-enable no-restricted-globals */

/**
 * 归一化 audienceType：空值/非法值一律回落 adult（兼容存量活动与 A2 未合入期）
 * @param {string} type
 * @returns {string} 'adult' | 'include_child' | 'include_elder' | 'include_child_elder'
 */
export function normalizeAudienceType(type) {
  var t = String(type == null ? '' : type).trim()
  if (VALID_AUDIENCE_TYPES.indexOf(t) >= 0) return t
  return AUDIENCE_TYPE_ADULT
}

/**
 * 归一化 audienceScope：空值/非法值一律回落 all
 * @param {string} scope
 * @returns {string} 'all' | 'member_only'
 */
export function normalizeAudienceScope(scope) {
  return scope === AUDIENCE_SCOPE_MEMBER_ONLY ? AUDIENCE_SCOPE_MEMBER_ONLY : AUDIENCE_SCOPE_ALL
}

/** audienceType 是否含儿童人群 */
export function audienceHasChild(type) {
  var t = normalizeAudienceType(type)
  return t === AUDIENCE_TYPE_INCLUDE_CHILD || t === AUDIENCE_TYPE_INCLUDE_CHILD_ELDER
}

/** audienceType 是否含长者人群 */
export function audienceHasElder(type) {
  var t = normalizeAudienceType(type)
  return t === AUDIENCE_TYPE_INCLUDE_ELDER || t === AUDIENCE_TYPE_INCLUDE_CHILD_ELDER
}

/**
 * 成人档两列费用（分）：{ regular, member }
 * 非会员列 price 优先、parentFee 回落；会员列 memberPrice 优先、parentMemberFee 回落
 */
export function adultFees(activity) {
  var a = activity || {}
  var price = num(a.price)
  var memberPrice = num(a.memberPrice)
  return {
    regular: price > 0 ? price : num(a.parentFee),
    member: memberPrice > 0 ? memberPrice : num(a.parentMemberFee)
  }
}

/** 儿童档两列费用（分）：{ regular, member } */
export function childFees(activity) {
  var a = activity || {}
  return {
    regular: num(a.childFee),
    member: num(a.childMemberFee)
  }
}

/** 长者档费用：复用成人价（D1：不新增长者价格列） */
export function elderFees(activity) {
  return adultFees(activity)
}

/** 身份标签文案：成人 / 儿童 / 长者 */
export function identityLabel(identity) {
  return IDENTITY_LABELS[identity] || '成人'
}

/**
 * 身份判定（A2 §2.4 / D4）：age < 18 → 儿童；age >= 60 → 长者；
 * 其余（含 age 为空/缺失）一律成人 —— 绝不可缺省判为儿童，否则会多收费。
 * @param {object} member FamilyMemberVO（需含 age）
 * @returns {string} 'adult' | 'child' | 'elder'
 */
export function classifyIdentity(member) {
  var m = member || {}
  var age = num(m.age)
  if (age > 0 && age < 18) return IDENTITY_CHILD
  if (age >= 60) return IDENTITY_ELDER
  return IDENTITY_ADULT
}

/**
 * 当前用户在某身份下的生效单价（分）
 * 会员：取会员价列，会员价留空（0）→ 回落非会员价
 * 非会员：取非会员价列；长者复用成人价
 * @param {object} activity 活动对象（price/memberPrice/childFee/childMemberFee/parentFee/parentMemberFee）
 * @param {string} identity 'adult' | 'child' | 'elder'
 * @param {boolean} isMember 当前用户是否会员
 * @returns {number} 分值；0 表示免费
 */
export function priceForIdentity(activity, identity, isMember) {
  var fees = identity === IDENTITY_CHILD ? childFees(activity) : adultFees(activity)
  if (isMember) {
    return fees.member > 0 ? fees.member : fees.regular
  }
  return fees.regular
}

/** 活动是否收费：任一人群任一档 > 0（纳入 price/memberPrice，修复"只填成人价误显免费"） */
export function hasAnyFee(activity) {
  var adult = adultFees(activity)
  var child = childFees(activity)
  return adult.regular > 0 || adult.member > 0 || child.regular > 0 || child.member > 0
}

/** 是否存在会员专享价（用于非会员引导开通会员） */
export function hasAnyMemberFee(activity) {
  var adult = adultFees(activity)
  var child = childFees(activity)
  return adult.member > 0 || child.member > 0
}

/**
 * 当前用户可用档位的最小生效单价（分）
 * 可用档位 = 成人档（恒含）+ 儿童档（audienceType 含 child 时）；长者复用成人价，不额外计档
 * @returns {number} 0 表示无可用付费档位（免费活动）
 */
export function minAvailablePrice(activity, isMember) {
  var a = activity || {}
  var best = -1
  var adult = priceForIdentity(a, IDENTITY_ADULT, isMember)
  if (adult > 0) best = adult
  if (audienceHasChild(a.audienceType)) {
    var child = priceForIdentity(a, IDENTITY_CHILD, isMember)
    if (child > 0 && (best < 0 || child < best)) best = child
  }
  return best < 0 ? 0 : best
}

/**
 * 双价展示文案（与活动详情页原 feeText 口径一致）
 * 会员价更低时：「80.00（会员） / 100.00」；否则只显示主价；regular=0 且 member>0 →「会员免费」
 * @param {number} regularFee 非会员价（分）
 * @param {number} memberFee 会员价（分）
 * @returns {string} 如 "100.00" / "80.00（会员） / 100.00" / "0.00" / "会员免费"
 */
export function feeText(regularFee, memberFee) {
  var regular = num(regularFee) / 100
  var member = num(memberFee) / 100
  if (member > 0 && member < regular) return member.toFixed(2) + '（会员） / ' + regular.toFixed(2)
  if (regular === 0 && member === 0) return '0.00'
  if (regular === 0) return '会员免费'
  return regular.toFixed(2)
}

/**
 * 海报价格文案信息：按 audienceType 选档位标签与价格
 *   1) 含儿童人群且儿童档有价 → 儿童价（儿童）
 *   2) 含长者人群            → 成人价（长者）   ← 长者复用成人价
 *   3) 其余                  → 成人价（成人）
 * @returns {{label:string, text:string}} label 为 '成人'/'儿童'/'长者'/'免费'
 */
export function posterPriceInfo(activity) {
  var a = activity || {}
  var t = normalizeAudienceType(a.audienceType)
  var adult = adultFees(a)
  var child = childFees(a)
  if (!hasAnyFee(a)) return { label: '免费', text: '免费' }
  var label = '成人'
  var regular = adult.regular
  var member = adult.member
  if (audienceHasChild(t) && (child.regular > 0 || child.member > 0)) {
    label = '儿童'
    regular = child.regular
    member = child.member
  } else if (audienceHasElder(t)) {
    label = '长者'
  }
  return { label: label, text: feeText(regular, member) + '（' + label + '）' }
}

/**
 * audienceType → 后台多选勾选数组（'adult' 恒选）
 * @param {string} type
 * @returns {string[]} 如 ['adult', 'child']
 */
export function audienceTypeList(type) {
  var t = normalizeAudienceType(type)
  var list = ['adult']
  if (audienceHasChild(t)) list.push('child')
  if (audienceHasElder(t)) list.push('elder')
  return list
}

/**
 * 后台多选勾选数组 → audienceType 编码
 * @param {string[]} list 如 ['adult', 'child']
 * @returns {string} 'adult' | 'include_child' | 'include_elder' | 'include_child_elder'
 */
export function encodeAudienceType(list) {
  var arr = list || []
  var hasChild = false
  var hasElder = false
  for (var i = 0; i < arr.length; i++) {
    if (arr[i] === 'child') hasChild = true
    else if (arr[i] === 'elder') hasElder = true
  }
  if (hasChild && hasElder) return AUDIENCE_TYPE_INCLUDE_CHILD_ELDER
  if (hasChild) return AUDIENCE_TYPE_INCLUDE_CHILD
  if (hasElder) return AUDIENCE_TYPE_INCLUDE_ELDER
  return AUDIENCE_TYPE_ADULT
}

/** audienceScope 展示文案 */
export function audienceScopeLabel(scope) {
  return scope === AUDIENCE_SCOPE_MEMBER_ONLY ? '仅会员参加' : '全部用户'
}