/**
 * Chinese-label map + grouping for the Account all-fields drawer.
 *
 * Mirrors the Customer approach (see customerFields.ts). The 云客 upstream
 * account records (`WechatAccount.raw_json` / `WhatsappAccount.raw_json`)
 * carry the verbatim wechatweb/qqweb account-list payload (wechatId / uid /
 * nickName / alias / userName / sendNum / receiveNum / dbSize /
 * onlineStatus / lastUpdate / talkerCount / friendAddNum / ...). This module
 * turns that blob into a labeled, grouped, render-ready structure for the
 * drawer opened by clicking an account row.
 *
 * Structured columns are preferred over the verbatim raw_json value when both
 * exist. Unknown keys fall back to the raw key under 其他, so a new field
 * added upstream still shows up.
 */
import type { Account } from '@/api/types'
import { formatTime } from './format'

/** camelCase raw_json key → 中文 label. Missing keys fall back to the key. */
export const ACCOUNT_FIELD_LABELS: Record<string, string> = {
  // 标识
  wechatId: '账号ID',
  uid: '账号ID',
  channel: '渠道',
  nickName: '昵称',
  alias: '微信号',
  headImgUrl: '头像',
  // 归属员工
  userName: '员工姓名',
  userId: '员工ID',
  user_id: '员工ID',
  user_name: '员工姓名',
  phone: '手机',
  salePhone: '销售手机',
  sale_phone: '销售手机',
  salesBindPhone: '绑定手机',
  deptId: '部门ID',
  deptName: '部门',
  // 业务统计
  contactsNum: '好友数',
  groupNum: '群数',
  sendNum: '发送消息数',
  receiveNum: '接收消息数',
  talkerCount: '会话数',
  friendAddNum: '新增好友数',
  dbSize: '本地库大小',
  // 状态与时间
  isOnJob: '在职',
  is_on_job: '在职',
  onlineStatus: '在线状态',
  lastUpdate: '最后更新',
  // 其他 / 内部
  version: '版本号',
}

/**
 * raw_json camelCase key → the structured snake_case column that mirrors it.
 * When a structured column is populated we prefer it; we fall back to the
 * verbatim raw_json value otherwise.
 */
const STRUCTURED_ALIAS: Record<string, keyof Account> = {
  wechatId: 'account_id',
  uid: 'account_id',
  channel: 'channel',
  nickName: 'nickname',
  userName: 'user_name',
  user_name: 'user_name',
  userId: 'user_id',
  user_id: 'user_id',
  phone: 'phone',
  contactsNum: 'contacts_num',
  groupNum: 'group_num',
  isOnJob: 'is_on_job',
  is_on_job: 'is_on_job',
}

/** Fields whose value is an image URL → render as a thumbnail. */
const IMAGE_KEYS = new Set(['headImgUrl'])

/** Fields whose value is a millisecond epoch → format to local datetime. */
const TIMESTAMP_KEYS = new Set(['lastUpdate'])

/** Fields whose value is a boolean / 0|1 flag → render 是/否. */
const BOOLEAN_KEYS = new Set(['isOnJob', 'is_on_job'])

/** Drawer sections, rendered in this order. */
export interface AccountFieldGroup {
  title: string
  /** raw_json / snake_case keys to surface in this section. */
  keys: string[]
}

export const ACCOUNT_FIELD_GROUPS: AccountFieldGroup[] = [
  {
    title: '基本信息',
    keys: ['wechatId', 'uid', 'channel', 'nickName', 'alias', 'headImgUrl'],
  },
  {
    title: '归属员工',
    keys: [
      'userName',
      'user_name',
      'userId',
      'user_id',
      'phone',
      'salePhone',
      'sale_phone',
      'salesBindPhone',
      'deptId',
      'deptName',
    ],
  },
  {
    title: '业务统计',
    keys: [
      'contactsNum',
      'groupNum',
      'sendNum',
      'receiveNum',
      'talkerCount',
      'friendAddNum',
      'dbSize',
    ],
  },
  {
    title: '状态与时间',
    keys: ['isOnJob', 'is_on_job', 'onlineStatus', 'lastUpdate', 'version'],
  },
]

/** Every key already surfaced via a group (so 其他 can skip duplicates). */
const KNOWN_KEYS = new Set(ACCOUNT_FIELD_GROUPS.flatMap((g) => g.keys))

/** Resolve the 中文 label for a key (falls back to the key). */
export function fieldLabel(key: string): string {
  return ACCOUNT_FIELD_LABELS[key] ?? key
}

/**
 * Read a field value with structured-column preference.
 * Returns the verbatim raw_json value when no structured column maps.
 */
export function readField(a: Account, camelKey: string): unknown {
  const alias = STRUCTURED_ALIAS[camelKey]
  if (alias) {
    const v = a[alias]
    if (v !== null && v !== undefined) return v
  }
  return a.raw_json?.[camelKey]
}

/** A single field prepared for drawer rendering. */
export interface DisplayField {
  key: string
  label: string
  /** Raw value (for text fallback). */
  value: unknown
  /** How the template should render it. */
  render: 'image' | 'time' | 'bool' | 'text' | 'empty'
  /** Pre-formatted text. Empty for image/empty. */
  text: string
}

/** 0|1|true|false → 是/否; other ints pass through so info isn't hidden. */
export function yesNoLabel(v: unknown): string {
  if (v === true || v === 1 || v === '1') return '是'
  if (v === false || v === 0 || v === '0') return '否'
  return String(v)
}

/** Render a byte count as a human-readable string (KB/MB/GB). */
export function formatBytes(v: unknown): string {
  if (typeof v !== 'number' || !Number.isFinite(v) || v < 0) return String(v)
  if (v < 1024) return `${v} B`
  const units = ['KB', 'MB', 'GB', 'TB']
  let size = v / 1024
  let i = 0
  while (size >= 1024 && i < units.length - 1) {
    size /= 1024
    i++
  }
  return `${size.toFixed(size >= 10 ? 0 : 1)} ${units[i]}`
}

/** Classify + format a single field for the drawer. */
export function toDisplayField(a: Account, camelKey: string): DisplayField {
  const value = readField(a, camelKey)
  const label = fieldLabel(camelKey)
  if (value === null || value === undefined || value === '') {
    return { key: camelKey, label, value, render: 'empty', text: '' }
  }
  if (IMAGE_KEYS.has(camelKey) && typeof value === 'string') {
    return { key: camelKey, label, value, render: 'image', text: '' }
  }
  if (TIMESTAMP_KEYS.has(camelKey) && typeof value === 'number') {
    return { key: camelKey, label, value, render: 'time', text: formatTime(value) }
  }
  if (BOOLEAN_KEYS.has(camelKey)) {
    return { key: camelKey, label, value, render: 'bool', text: yesNoLabel(value) }
  }
  if (camelKey === 'dbSize' && typeof value === 'number') {
    return {
      key: camelKey,
      label,
      value,
      render: 'text',
      text: formatBytes(value),
    }
  }
  return { key: camelKey, label, value, render: 'text', text: String(value) }
}

/**
 * Build the grouped display model for an account.
 *
 * Each known group only includes fields that have a value (empty ones are
 * dropped to keep the drawer compact). A trailing 其他 section collects every
 * raw_json key not already surfaced, so new upstream fields show up
 * automatically instead of being silently hidden.
 */
export interface AccountFieldSection {
  title: string
  fields: DisplayField[]
}

export function buildAccountSections(a: Account): AccountFieldSection[] {
  const sections: AccountFieldSection[] = ACCOUNT_FIELD_GROUPS.map((g) => ({
    title: g.title,
    fields: g.keys
      .map((k) => toDisplayField(a, k))
      .filter((f) => f.render !== 'empty'),
  }))

  // 其他: every raw_json key not already shown, in original insertion order.
  const raw = a.raw_json ?? {}
  const others: DisplayField[] = []
  for (const key of Object.keys(raw)) {
    if (KNOWN_KEYS.has(key)) continue
    const f = toDisplayField(a, key)
    if (f.render === 'empty') continue
    others.push(f)
  }
  if (others.length > 0) {
    sections.push({ title: '其他字段', fields: others })
  }

  return sections.filter((sec) => sec.fields.length > 0)
}