/**
 * 签署记录查询（工作台 · 签署记录查询）。
 *
 * 这里回答的是「历史签署记录」，与签署工作台那份「当前待办」不是同一个视角：
 * 工作台按当天操作组织，记录页按条件检索全量历史，因此两边各有一份演示数据 ——
 * 工作台的种子固定在某一天，直接拿它当历史记录，会让「今日 / 近 3 天」这些筛选
 * 在演示里长期空着，看不出筛选到底有没有生效。两份种子的字段口径完全一致
 * （都是 SigningRecord），真实模式下读的也是同一个接口，所以不存在两套业务语义。
 *
 * 真实模式复用已有的签署任务列表接口（GET /v1/sign-tasks）：签署记录就是签署任务的
 * 历史视图，后端目前没有单独的记录检索接口，前端不凭空造一个不存在的地址。
 * 已知差异：后端该接口不支持按「文档类别」筛选，记录页会在真实模式下禁用这一项
 * （见 SigningRecordFilterBar 的 categoryEnabled），不做静默忽略。
 */

import { DEMO_SIGNATURE_DATA_URL } from '@/utils/demo-signature'
import { mockFlags } from '@/utils/mock-flags'
import { buildFieldSpanHtml } from '@/utils/signing-fields'
import { formatSigningMethod, toBackendSigningMethod } from '@/utils/signing-method'

import {
  campusOfDepartment,
  mockDocumentById,
  mockDocumentCatalog,
  type MockDocumentDef,
} from './mock-catalog'
import { getSigningTaskDetail, getSigningTaskEvents, getSigningTasks } from './signing'
import type {
  PatientSex,
  SigningApiOptions,
  SigningFieldKind,
  SigningMethod,
  SigningRecord,
  SigningRecordListResponse,
  SigningRecordQuery,
  SigningTaskEvent,
  SigningTaskQuery,
  SigningTaskRecord,
  SigningTaskStatus,
  VisitType,
} from './types'

const useMockData = mockFlags.signRecords

export const isSigningRecordsMockEnabled = useMockData

/** 签署记录的演示数据量上限：导出时逐页取回，避免一条筛选条件意外拉回整个库 */
const MAX_PAGES = 25
/** 导出/批量取回时单页条数 */
const BULK_PAGE_SIZE = 200

/**
 * 演示正文。
 *
 * 记录页的「查看」要能打开当时的文书，所以演示记录必须带正文快照。
 * 正文由文书定义现场生成（含结构化占位符，签名位与签署日期都能按记录取值回显），
 * 不是渲染时兜底拼出来的假纸样 —— 那种兜底只在正文真的取不到时才允许出现。
 *
 * 惰性构建：buildFieldSpanHtml 依赖 DOM，模块在 Node 侧被 import 时不该直接抛错。
 */
let mockDocumentHtmlCache: Map<string, string> | null = null

function buildMockDocumentHtml(document: MockDocumentDef): string {
  const field = (id: string, label: string, kind: SigningFieldKind = 'text', required = false) =>
    buildFieldSpanHtml({ id, label, kind, required, options: [] })

  return [
    `<h2>${document.name}</h2>`,
    '<h3>一、患者与就诊信息</h3>',
    '<table><tbody>',
    `<tr><td>患者姓名</td><td>${field('patient', '患者姓名', 'text', true)}</td>`,
    `<td>性别</td><td>${field('sex', '性别')}</td></tr>`,
    `<tr><td>年龄</td><td>${field('age', '年龄')}</td>`,
    `<td>住院号/门诊号</td><td>${field('visit', '就诊号')}</td></tr>`,
    '</tbody></table>',
    '<h3>二、风险告知与注意事项</h3>',
    `<ol>${document.items.map((item) => `<li>${item}</li>`).join('')}</ol>`,
    '<p>医务人员已就上述诊疗方案、医疗风险、替代方案及可能出现的不良后果向患者本人（或授权委托人）充分说明，患者已完全理解并表示同意。</p>',
    '<h3>三、签字确认</h3>',
    '<table><tbody>',
    `<tr><td>患者（或授权委托人）签名：${field('signature', '患者签名', 'signature', true)}</td>`,
    `<td>签署日期：${field('signedDate', '签署日期', 'date', true)}</td></tr>`,
    `<tr><td>经治医师签名：${field('doctor', '医师签名', 'signature')}</td><td></td></tr>`,
    '</tbody></table>',
    '<p>注：本知情同意书采用电子方式签署，签名图片与文书原件一并留存，可随时查验。</p>',
  ].join('')
}

function getMockDocumentHtml(documentId: string): string {
  mockDocumentHtmlCache ??= new Map(
    mockDocumentCatalog.map((document) => [document.id, buildMockDocumentHtml(document)]),
  )

  return mockDocumentHtmlCache.get(documentId) ?? ''
}

/* =========================================================================
   演示数据：记录种子
   ========================================================================= */

/**
 * 一条演示记录的种子。
 *
 * 只写「人 + 事」：患者 ID、就诊号、院区、失效时间这些都能由这几项派生出来
 * （见 buildMockRecord），逐条手写既冗长又容易写错。
 * `days` 是距今天数（0 = 今天），演示数据因此始终落在「今日 / 近 3 天 / 近 7 天」窗口内，
 * 不会像写死日期那样，过几天就全部落到筛选范围之外。
 */
interface MockRecordSeed {
  patient: string
  sex: PatientSex
  age: number
  visitType: VisitType
  /** mockDocumentCatalog 的 id */
  doc: string
  status: SigningTaskStatus
  method: SigningMethod
  days: number
  /** 发起时刻 HH:mm */
  at: string
  /** 签署用时（分钟）：只有已签署的记录才有 */
  minutes?: number
  source?: string
  voidReason?: string
  /** 患者签署后是否需要科室复核签章（原型 needConfirm） */
  needConfirm?: boolean
}

const MOCK_RECORD_SEEDS: MockRecordSeed[] = [
  // 今天
  { patient: '赵美英', sex: '女', age: 58, visitType: '住院', doc: 'mock-doc-cardiac', status: 'signed', method: 'pad', days: 0, at: '09:12', minutes: 7 },
  { patient: '李淑芬', sex: '女', age: 67, visitType: '门诊', doc: 'mock-doc-mri', status: 'signed', method: 'sms', days: 0, at: '10:05', minutes: 4 },
  { patient: '周雅琴', sex: '女', age: 29, visitType: '门诊', doc: 'mock-doc-endoscopy', status: 'pending', method: 'sms', days: 0, at: '11:20' },
  { patient: '赵某某', sex: '男', age: 52, visitType: '住院', doc: 'mock-doc-admission', status: 'pending', method: 'ipad', days: 0, at: '09:05', source: '工作台发起' },
  { patient: '孙浩然', sex: '男', age: 54, visitType: '住院', doc: 'mock-doc-endoscopy', status: 'pending', method: 'wx', days: 0, at: '08:50' },
  // 「待科室确认」样本：患者已签完，等科室复核签章（原型 T0818006 那种）
  { patient: '王秀兰', sex: '女', age: 63, visitType: '住院', doc: 'mock-doc-endoscopy', status: 'confirming', method: 'sms', days: 0, at: '10:40', minutes: 5, needConfirm: true },
  // 昨天
  { patient: '孙浩然', sex: '男', age: 54, visitType: '住院', doc: 'mock-doc-narcotic', status: 'signed', method: 'pad', days: 1, at: '08:40', minutes: 6, source: '工作台发起' },
  { patient: '王建国', sex: '男', age: 71, visitType: '住院', doc: 'mock-doc-blood', status: 'signed', method: 'sms', days: 1, at: '14:15', minutes: 9 },
  { patient: '陈志强', sex: '男', age: 61, visitType: '住院', doc: 'mock-doc-admission', status: 'void', method: 'pad', days: 1, at: '16:02', source: '工作台发起', voidReason: '文书选择错误，已重新发起' },
  { patient: '罗文静', sex: '女', age: 44, visitType: '住院', doc: 'mock-doc-mri', status: 'signed', method: 'ipad', days: 1, at: '11:35', minutes: 5 },
  // 近 3 天
  { patient: '吴桂芳', sex: '女', age: 73, visitType: '住院', doc: 'mock-doc-surgery', status: 'signed', method: 'pad', days: 2, at: '09:35', minutes: 5 },
  { patient: '刘伟', sex: '男', age: 45, visitType: '门诊', doc: 'mock-doc-cardiac', status: 'signed', method: 'sms', days: 2, at: '15:48', minutes: 3, source: '工作台发起' },
  { patient: '张海涛', sex: '男', age: 47, visitType: '门诊', doc: 'mock-doc-blood', status: 'confirming', method: 'pad', days: 2, at: '16:20', minutes: 6, needConfirm: true },
  { patient: '郑海燕', sex: '女', age: 38, visitType: '门诊', doc: 'mock-doc-endoscopy', status: 'expired', method: 'sms', days: 3, at: '10:22' },
  { patient: '黄志明', sex: '男', age: 66, visitType: '住院', doc: 'mock-doc-mri', status: 'signed', method: 'pad', days: 3, at: '13:07', minutes: 8 },
  // 近 7 天
  { patient: '徐丽华', sex: '女', age: 50, visitType: '住院', doc: 'mock-doc-blood', status: 'signed', method: 'pad', days: 4, at: '11:40', minutes: 6 },
  { patient: '马晓东', sex: '男', age: 33, visitType: '其他', doc: 'mock-doc-emergency', status: 'failed', method: 'pad', days: 5, at: '20:18', source: '工作台发起' },
  { patient: '何秀英', sex: '女', age: 79, visitType: '住院', doc: 'mock-doc-surgery', status: 'signed', method: 'sms', days: 6, at: '09:05', minutes: 12 },
  { patient: '林俊杰', sex: '男', age: 41, visitType: '门诊', doc: 'mock-doc-narcotic', status: 'signing', method: 'pad', days: 6, at: '14:52' },
  { patient: '梁俊豪', sex: '男', age: 35, visitType: '住院', doc: 'mock-doc-surgery', status: 'signed', method: 'wx', days: 6, at: '10:28', minutes: 4 },
  // 近 30 天
  { patient: '罗美玲', sex: '女', age: 62, visitType: '门诊', doc: 'mock-doc-admission', status: 'expired', method: 'sms', days: 11, at: '17:30' },
  { patient: '高文斌', sex: '男', age: 57, visitType: '住院', doc: 'mock-doc-cardiac', status: 'signed', method: 'pad', days: 14, at: '10:10', minutes: 7 },
  { patient: '邓小燕', sex: '女', age: 36, visitType: '门诊', doc: 'mock-doc-mri', status: 'void', method: 'sms', days: 19, at: '08:55', voidReason: '患者拒绝签署，任务作废' },
  { patient: '苏国华', sex: '男', age: 68, visitType: '住院', doc: 'mock-doc-endoscopy', status: 'signed', method: 'pad', days: 26, at: '15:25', minutes: 6 },
]

function pad(value: number) {
  return String(value).padStart(2, '0')
}

function formatDateTime(date: Date) {
  return `${date.getFullYear()}-${pad(date.getMonth() + 1)}-${pad(date.getDate())} ${pad(
    date.getHours(),
  )}:${pad(date.getMinutes())}`
}

/** 演示数据的就诊号前缀：与医院里门诊 / 住院 / 体检的编号习惯一致 */
const VISIT_NO_PREFIX: Record<VisitType, string> = {
  门诊: 'MZ',
  住院: 'ZY',
  体检: 'TJ',
  其他: 'JZ',
}

function buildMockRecord(seed: MockRecordSeed, index: number): SigningRecord {
  const document = mockDocumentById.get(seed.doc)

  if (!document) {
    throw new Error(`演示签署记录引用了不存在的文书：${seed.doc}`)
  }

  const createdAtDate = new Date()
  createdAtDate.setDate(createdAtDate.getDate() - seed.days)
  const [hour, minute] = seed.at.split(':').map(Number)
  createdAtDate.setHours(hour, minute, 0, 0)

  const createdAt = formatDateTime(createdAtDate)
  const signedDate = new Date(createdAtDate)
  signedDate.setMinutes(signedDate.getMinutes() + (seed.minutes ?? 0))
  // 待科室确认的记录同样已经签过了，签名时间与签名图都要有
  const hasSigned = seed.status === 'signed' || seed.status === 'confirming'
  const signedAt = hasSigned ? formatDateTime(signedDate) : undefined

  // 已超时的记录按 24 小时失效，其余按 48 小时；失效时间只做展示，不参与筛选
  const expireHours = seed.status === 'expired' ? 24 : 48
  const expiresAtDate = new Date(createdAtDate)
  expiresAtDate.setHours(expiresAtDate.getHours() + expireHours)

  const dateKey = `${createdAtDate.getFullYear()}${pad(createdAtDate.getMonth() + 1)}${pad(
    createdAtDate.getDate(),
  )}`

  return {
    id: `SR${dateKey}${pad(index + 1)}`,
    templateVersionId: `${seed.doc}-v1`,
    campus: campusOfDepartment(document.department),
    patientId: `P2026${10001 + index}`,
    patientName: seed.patient,
    sex: seed.sex,
    age: seed.age,
    visitNo: `${VISIT_NO_PREFIX[seed.visitType]}${dateKey}${pad(index + 1)}`,
    visitType: seed.visitType,
    visitDate: `${createdAtDate.getFullYear()}-${pad(createdAtDate.getMonth() + 1)}-${pad(
      createdAtDate.getDate(),
    )}`,
    documentId: document.id,
    documentName: document.name,
    category: document.category,
    department: document.department,
    signerName: seed.patient,
    method: seed.method,
    status: seed.status,
    needConfirm: seed.needConfirm ?? false,
    source: seed.source ?? '电子病历',
    createdAt,
    updatedAt: signedAt ?? createdAt,
    signedAt,
    expiresAt: formatDateTime(expiresAtDate),
    voidReason: seed.voidReason,
    // 已签署的记录带上签名图，否则「列表说已签署、打开没有签名」自相矛盾
    signatureDataUrl: hasSigned ? DEMO_SIGNATURE_DATA_URL : undefined,
    documentContentHtml: getMockDocumentHtml(document.id),
  }
}

/** 演示记录：种子派生一次，进程内复用（只读，不需要落盘） */
let mockRecordsCache: SigningRecord[] | null = null

function getMockRecords(): SigningRecord[] {
  mockRecordsCache ??= MOCK_RECORD_SEEDS.map(buildMockRecord)
  return mockRecordsCache
}

function cloneRecord(record: SigningRecord): SigningRecord {
  return {
    ...record,
    selectedItems: record.selectedItems ? [...record.selectedItems] : record.selectedItems,
    fieldAnswers: record.fieldAnswers ? { ...record.fieldAnswers } : record.fieldAnswers,
  }
}

/* =========================================================================
   查询
   ========================================================================= */

function parseRecordTime(value: string | undefined) {
  if (!value) {
    return null
  }

  const date = new Date(value.replace(' ', 'T'))
  return Number.isNaN(date.getTime()) ? null : date
}

/** 时间窗口：`to` 为开区间上界（不含），只有「今日 / 昨日」需要 */
function resolveDateWindow(range: SigningRecordQuery['dateRange']): {
  from: Date
  to: Date
} | null {
  const todayStart = new Date()
  todayStart.setHours(0, 0, 0, 0)
  const tomorrowStart = new Date(todayStart)
  tomorrowStart.setDate(tomorrowStart.getDate() + 1)

  const daysBack = (days: number) => {
    const from = new Date(todayStart)
    from.setDate(from.getDate() - days)
    return from
  }

  switch (range) {
    case 'today':
      return { from: todayStart, to: tomorrowStart }
    case 'yesterday':
      return { from: daysBack(1), to: todayStart }
    case '3d':
      return { from: daysBack(2), to: tomorrowStart }
    case '7d':
      return { from: daysBack(6), to: tomorrowStart }
    case '30d':
      return { from: daysBack(29), to: tomorrowStart }
    default:
      return null
  }
}

/**
 * 记录查询条件 → 签署任务查询条件。
 * 签署记录就是签署任务的历史视图，真实模式直接复用工作台的列表接口，
 * 因此这里只做字段映射；后端不支持的条件（文档类别）在页面层已禁用，不会走到这里。
 */
function toTaskQuery(query: SigningRecordQuery): SigningTaskQuery {
  return {
    page: query.page,
    pageSize: query.pageSize,
    keyword: query.keyword,
    status: query.status,
    dateRange: query.dateRange,
    campus: query.campus,
    method: query.method,
    department: query.department,
  }
}

function toRecord(task: SigningTaskRecord): SigningRecord {
  // 任务接口不返回文档类别，这里如实留空，由页面沿用列表里带出的那一份
  return { ...task, category: '' }
}

export async function getSigningRecords(
  query: SigningRecordQuery,
  options: SigningApiOptions = {},
): Promise<SigningRecordListResponse> {
  if (!useMockData) {
    const page = await getSigningTasks(toTaskQuery(query), options)

    return {
      records: page.records.map(toRecord),
      total: page.total,
      page: page.page,
      pageSize: page.pageSize,
    }
  }

  const window = resolveDateWindow(query.dateRange)
  const keyword = query.keyword?.trim().toLowerCase()
  const filtered = getMockRecords().filter((record) => {
    if (window) {
      const createdAt = parseRecordTime(record.createdAt ?? record.updatedAt)
      if (!createdAt || createdAt < window.from || createdAt >= window.to) {
        return false
      }
    }

    if (query.status && query.status !== 'all' && record.status !== query.status) {
      return false
    }

    if (query.campus && query.campus !== 'all' && record.campus !== query.campus) {
      return false
    }

    if (query.method && query.method !== 'all' && record.method !== query.method) {
      return false
    }

    if (query.department && record.department !== query.department) {
      return false
    }

    if (query.category && record.category !== query.category) {
      return false
    }

    if (keyword) {
      const haystack = [
        record.id,
        record.patientName,
        record.patientId,
        record.visitNo,
        record.documentName,
      ]
        .join(' ')
        .toLowerCase()

      if (!haystack.includes(keyword)) {
        return false
      }
    }

    return true
  })

  const sorted = filtered.sort(
    (left, right) =>
      (parseRecordTime(right.createdAt)?.getTime() ?? 0) -
      (parseRecordTime(left.createdAt)?.getTime() ?? 0),
  )
  const page = Math.max(query.page, 1)
  const pageSize = Math.max(query.pageSize, 1)
  const start = (page - 1) * pageSize

  return {
    records: sorted.slice(start, start + pageSize).map(cloneRecord),
    total: sorted.length,
    page,
    pageSize,
  }
}

/**
 * 逐页取回当前筛选条件下的全部记录，供导出使用。
 * 单次查询上限见 MAX_PAGES：宁可在演示/导出时截断并提示，也不要一条筛选条件
 * 意外把整个库拉进浏览器内存。
 */
export async function getAllSigningRecords(
  query: SigningRecordQuery,
  options: SigningApiOptions = {},
): Promise<SigningRecord[]> {
  const firstPage = await getSigningRecords(
    { ...query, page: 1, pageSize: BULK_PAGE_SIZE },
    options,
  )
  const pageCount = Math.min(
    Math.max(Math.ceil(firstPage.total / firstPage.pageSize), 1),
    MAX_PAGES,
  )

  if (pageCount === 1) {
    return firstPage.records
  }

  const rest = await Promise.all(
    Array.from({ length: pageCount - 1 }, (_, index) =>
      getSigningRecords({ ...query, page: index + 2, pageSize: BULK_PAGE_SIZE }, options),
    ),
  )

  return [firstPage, ...rest].flatMap((page) => page.records)
}

/** 记录详情：真实模式按任务接口取回正文快照与固化信息 */
export async function getSigningRecordDetail(
  id: string,
  options: SigningApiOptions = {},
): Promise<SigningRecord | null> {
  if (!useMockData) {
    const task = await getSigningTaskDetail(id, options)
    return task ? toRecord(task) : null
  }

  const record = getMockRecords().find((item) => item.id === id)
  return record ? cloneRecord(record) : null
}

/* =========================================================================
   操作留痕
   ========================================================================= */

/**
 * 演示留痕：按记录状态推导一条时间线。
 *
 * 与签署工作台的演示留痕同口径（创建 → 发送 → 签署 / 作废 → 结束），
 * 但时间点一律取记录自身固化的时间，不掺"现在"—— 历史记录的操作时间
 * 如果每次刷新都在变，就没法用来核对签署链路了。
 */
function buildMockEvents(record: SigningRecord): SigningTaskEvent[] {
  const backendChannel = toBackendSigningMethod(record.method)
  // 线上方式（短信 / 公众号）才有一条「已发送」留痕，现场方式是设备上直接采集
  const isOnline = record.method === 'sms' || record.method === 'wx'
  const createdAt = record.createdAt ?? record.updatedAt
  const events: SigningTaskEvent[] = [
    {
      id: `${record.id}-created`,
      time: createdAt,
      text: `张文静创建签署任务（${formatSigningMethod(record.method)}）`,
      eventType: 'TASK_CREATED',
      channel: backendChannel,
    },
  ]

  if (isOnline) {
    events.push({
      id: `${record.id}-sent`,
      time: createdAt,
      text:
        record.method === 'wx'
          ? `已向 ${record.patientName} 推送公众号签署通知`
          : `已向 ${record.patientName} 预留手机号发送签署短信`,
      eventType: 'SEND_PREPARED',
      channel: backendChannel,
      attemptNo: 1,
    })
  }

  if (record.status === 'signing') {
    events.push({
      id: `${record.id}-signing`,
      time: record.updatedAt,
      text: '已打开签名采集，等待患者完成签名',
      eventType: 'SIGNING_STARTED',
      channel: backendChannel,
    })
  }

  if (record.signedAt) {
    events.push({
      id: `${record.id}-signed`,
      time: record.signedAt,
      text: `患者 ${record.signerName} 完成签名，系统已合成文书并双留存`,
      eventType: 'SIGNED',
      channel: backendChannel,
    })
  }

  if (record.status === 'expired') {
    events.push({
      id: `${record.id}-expired`,
      time: record.expiresAt,
      text: '签署链接已过期，任务自动结束（可重新发起）',
      eventType: 'EXPIRED',
    })
  }

  // 需科室确认的记录：签完先入科室确认队列，科室签章后才归档（与工作台留痕同一口径）
  if (record.needConfirm && record.signedAt) {
    events.push({
      id: `${record.id}-confirm-queued`,
      time: record.signedAt,
      text: `已推送至${record.department}确认队列，等待科室复核签章`,
      eventType: 'CONFIRM_QUEUED',
      channel: backendChannel,
    })

    if (record.status === 'signed') {
      events.push({
        id: `${record.id}-confirmed`,
        time: record.updatedAt,
        text: '科室复核签章完成，文档归档至本次诊疗记录',
        eventType: 'CONFIRMED',
        channel: backendChannel,
      })
    }
  }

  if (record.status === 'failed') {
    events.push({
      id: `${record.id}-failed`,
      time: record.updatedAt,
      text: '签名合成失败，请核对签名图与文书模板后重新发起',
      eventType: 'FAILED',
      reason: '签名合成失败',
    })
  }

  if (record.status === 'void') {
    events.push({
      id: `${record.id}-voided`,
      time: record.updatedAt,
      text: `任务已作废${record.voidReason ? `，原因：${record.voidReason}` : ''}`,
      eventType: 'VOIDED',
      reason: record.voidReason,
    })
  }

  return events
}

export async function getSigningRecordEvents(id: string): Promise<SigningTaskEvent[]> {
  if (!useMockData) {
    return getSigningTaskEvents(id)
  }

  const record = getMockRecords().find((item) => item.id === id)
  return record ? buildMockEvents(record) : []
}