/**
 * Chinese-label map + grouping for the SMS all-fields drawer.
 *
 * Mirrors the Customer approach (see customerFields.ts): the 云客 upstream
 * SMS record (`Sms.raw_json`) carries the camelCase fields the source 短信记录
 * page shows (id/customerPhone, sms/smsSub, sender, direction, userId,
 * senderDepartment, receiveName, createTime, simPhone/simNumber, source).
 * This module turns that blob into a labeled, grouped, render-ready structure
 * for the drawer opened by clicking an SMS row.
 *
 * Structured columns are preferred over the verbatim raw_json value when both
 * exist (the structured column is type-normalized on ingest). Unknown keys
 * (anything not in the label map) fall back to the raw key under 其他, so a
 * new field added upstream still shows up instead of disappearing.
 */
import type { Sms } from '@/api/types'
import { formatTime } from './format'

/** camelCase raw_json key → 中文 label. Missing keys fall back to the key. */
export const SMS_FIELD_LABELS: Record<string, string> = {
  // 标识与时间
  id: '短信ID',
  createTime: '时间',
  // 客户与号码
  customerPhone: '客户号码',
  sender: '发送者',
  receiveName: '接收者',
  // 内容
  sms: '全文',
  smsSub: '预览',
  // 方向与归属
  direction: '方向',
  userId: '员工ID',
  senderDepartment: '部门',
  // 设备与来源
  simPhone: 'SIM手机',
  simNumber: 'SIM号',
  source: '来源',
}

/**
 * raw_json camelCase key → the structured snake_case column that mirrors it.
 * When a structured column is populated we prefer it (type-normalized); we
 * fall back to the verbatim raw_json value otherwise.
 */
const STRUCTURED_ALIAS: Record<string, keyof Sms> = {
  id: 'sms_id',
  customerPhone: 'customer_phone',
  sms: 'content',
  smsSub: 'content_preview',
  sender: 'sender',
  direction: 'direction',
  userId: 'user_id',
  receiveName: 'receive_name',
  createTime: 'create_time',
  simPhone: 'sim_phone',
}

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

/** Fields whose value is a direction code (0=接收 / 1=发送). */
const DIRECTION_KEYS = new Set(['direction'])

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

export const SMS_FIELD_GROUPS: SmsFieldGroup[] = [
  {
    title: '标识与时间',
    keys: ['id', 'createTime'],
  },
  {
    title: '客户与号码',
    keys: ['customerPhone', 'sender', 'receiveName'],
  },
  {
    title: '内容',
    keys: ['sms', 'smsSub'],
  },
  {
    title: '方向与归属',
    keys: ['direction', 'userId', 'senderDepartment'],
  },
  {
    title: '设备与来源',
    keys: ['simPhone', 'simNumber', 'source'],
  },
]

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

/** Resolve the 中文 label for a raw_json key (falls back to the key). */
export function fieldLabel(key: string): string {
  return SMS_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(s: Sms, camelKey: string): unknown {
  const alias = STRUCTURED_ALIAS[camelKey]
  if (alias) {
    const v = s[alias]
    if (v !== null && v !== undefined) return v
  }
  return s.raw_json?.[camelKey]
}

/** direction: 1 = 发送 (outbound), 0 = 接收 (inbound), other values pass through. */
function smsDirectionLabel(v: unknown): string {
  if (v === 1 || v === '1') return '发送'
  if (v === 0 || v === '0') return '接收'
  return String(v)
}

/** 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: 'time' | 'direction' | 'text' | 'empty'
  /** Pre-formatted text (for non-empty kinds). Empty for empty. */
  text: string
}

/** Classify + format a single field for the drawer. */
export function toDisplayField(s: Sms, camelKey: string): DisplayField {
  const value = readField(s, camelKey)
  const label = fieldLabel(camelKey)
  if (value === null || value === undefined || value === '') {
    return { key: camelKey, label, value, render: 'empty', text: '' }
  }
  if (TIMESTAMP_KEYS.has(camelKey) && typeof value === 'number') {
    return { key: camelKey, label, value, render: 'time', text: formatTime(value) }
  }
  if (DIRECTION_KEYS.has(camelKey)) {
    return {
      key: camelKey,
      label,
      value,
      render: 'direction',
      text: smsDirectionLabel(value),
    }
  }
  return { key: camelKey, label, value, render: 'text', text: String(value) }
}

/**
 * Build the grouped display model for an SMS row.
 *
 * 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 SmsFieldSection {
  title: string
  fields: DisplayField[]
}

export function buildSmsSections(s: Sms): SmsFieldSection[] {
  const sections: SmsFieldSection[] = SMS_FIELD_GROUPS.map((g) => ({
    title: g.title,
    fields: g.keys
      .map((k) => toDisplayField(s, k))
      .filter((f) => f.render !== 'empty'),
  }))

  // 其他: every raw_json key not already shown, in original insertion order.
  const raw = s.raw_json ?? {}
  const others: DisplayField[] = []
  for (const key of Object.keys(raw)) {
    if (KNOWN_KEYS.has(key)) continue
    const f = toDisplayField(s, 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)
}