/**
 * 员工特殊状态台账服务
 * 管理三期（孕期/产期/哺乳期）、工伤、医疗期等特殊状态的跟踪和提醒
 */
import prisma from '../lib/prisma'

/** 特殊状态类型 */
export const STATUS_TYPES: Record<string, { label: string; color: string }> = {
  PREGNANCY: { label: '三期', color: 'pink' },
  WORK_INJURY: { label: '工伤', color: 'red' },
  MEDICAL_PERIOD: { label: '医疗期', color: 'orange' },
  OTHER: { label: '其他', color: 'gray' },
}

/** 状态文本映射 */
export const STATUS_LABELS: Record<string, string> = {
  ACTIVE: '进行中',
  PENDING: '待处理',
  RESOLVED: '已结束',
}

/**
 * 获取预警级别（基于提醒日期）
 * - red: 已过期或7天内到期
 * - yellow: 30天内到期
 * - green: 正常
 */
export function getAlertLevel(reminderDate: Date | null, status: string): 'red' | 'yellow' | 'green' {
  if (status === 'RESOLVED') return 'green'
  if (!reminderDate) return 'green'
  const now = new Date()
  const days = Math.floor((reminderDate.getTime() - now.getTime()) / (1000 * 60 * 60 * 24))
  if (days <= 7) return 'red'
  if (days <= 30) return 'yellow'
  return 'green'
}

/**
 * 根据三期数据自动计算关键日期
 * - 产假: 产前15天 + 产后75天（共98天，难产+15天）
 * - 哺乳期: 至孩子满1周岁
 */
export function calculatePregnancyDates(expectedDueDate: Date): {
  maternityLeaveStart: Date
  maternityLeaveEnd: Date
  nursingEndDate: Date
} {
  // 产假开始: 预产期前15天
  const maternityLeaveStart = new Date(expectedDueDate)
  maternityLeaveStart.setDate(maternityLeaveStart.getDate() - 15)

  // 产假结束: 预产期后75天（共98天）
  const maternityLeaveEnd = new Date(expectedDueDate)
  maternityLeaveEnd.setDate(maternityLeaveEnd.getDate() + 75)

  // 哺乳期截止: 孩子满1周岁
  const nursingEndDate = new Date(expectedDueDate)
  nursingEndDate.setFullYear(nursingEndDate.getFullYear() + 1)

  return { maternityLeaveStart, maternityLeaveEnd, nursingEndDate }
}

/**
 * 根据工龄计算医疗期月数
 * - 实际工作年限 < 5年: 本单位 < 3年 → 3个月, ≥ 3年 → 6个月
 * - 实际工作年限 ≥ 5年: 本单位 < 3年 → 6个月, 3~5年 → 9个月, 5~10年 → 12个月, ≥10年 → 24个月
 */
export function calculateMedicalMonths(totalWorkYears: number, companyYears: number): number {
  if (totalWorkYears < 5) {
    return companyYears < 3 ? 3 : 6
  }
  if (companyYears < 3) return 6
  if (companyYears < 5) return 9
  if (companyYears < 10) return 12
  return 24
}

/**
 * 添加操作时间线条目
 */
function addTimelineEntry(existing: any[], action: string, by: string): any[] {
  const entry = { time: new Date().toISOString(), action, by }
  return [...(existing || []), entry]
}

/**
 * 创建特殊状态记录
 */
export async function createSpecialStatus(orgId: string, userId: string, data: any) {
  const employee = await prisma.employee.findFirst({ where: { id: data.employeeId, orgId } })
  if (!employee) {
    throw { code: 'NOT_FOUND', message: '员工不存在' }
  }

  // 三期自动计算
  let pregnancyData: any = {}
  if (data.type === 'PREGNANCY' && data.expectedDueDate) {
    const dates = calculatePregnancyDates(new Date(data.expectedDueDate))
    pregnancyData = dates
  }

  // 医疗期自动计算截止日
  let medicalData: any = {}
  if (data.type === 'MEDICAL_PERIOD' && data.startDate && data.medicalMonths) {
    const end = new Date(data.startDate)
    end.setMonth(end.getMonth() + data.medicalMonths)
    medicalData.medicalPeriodEnd = end
  }

  const record = await (prisma as any).employeeSpecialStatus.create({
    data: {
      orgId,
      employeeId: data.employeeId,
      type: data.type,
      status: data.status || 'ACTIVE',
      startDate: data.startDate ? new Date(data.startDate) : null,
      endDate: data.endDate ? new Date(data.endDate) : null,
      expectedDueDate: data.expectedDueDate ? new Date(data.expectedDueDate) : null,
      maternityLeaveStart: pregnancyData.maternityLeaveStart || null,
      maternityLeaveEnd: pregnancyData.maternityLeaveEnd || null,
      nursingEndDate: pregnancyData.nursingEndDate || null,
      injuryDate: data.injuryDate ? new Date(data.injuryDate) : null,
      injuryDescription: data.injuryDescription || null,
      certificationDate: data.certificationDate ? new Date(data.certificationDate) : null,
      certificationNo: data.certificationNo || null,
      disabilityLevel: data.disabilityLevel || null,
      assessmentDate: data.assessmentDate ? new Date(data.assessmentDate) : null,
      medicalMonths: data.medicalMonths || null,
      medicalPeriodEnd: medicalData.medicalPeriodEnd || null,
      description: data.description || null,
      attachments: data.attachments || null,
      reminderDate: data.reminderDate ? new Date(data.reminderDate) : null,
      timeline: addTimelineEntry([], '创建记录', userId),
      createdBy: userId,
    },
  })

  // 同步更新 Employee 的布尔字段
  await syncEmployeeFlags(employee.id, data.type, true)

  return record
}

/**
 * 更新特殊状态记录
 */
export async function updateSpecialStatus(orgId: string, userId: string, id: string, data: any) {
  const existing = await (prisma as any).employeeSpecialStatus.findFirst({
    where: { id, orgId },
  })
  if (!existing) {
    throw { code: 'NOT_FOUND', message: '记录不存在' }
  }

  const updateData: any = {}
  const fields = [
    'type', 'status', 'startDate', 'endDate', 'actualEndDate',
    'expectedDueDate', 'maternityLeaveStart', 'maternityLeaveEnd', 'nursingEndDate',
    'injuryDate', 'injuryDescription', 'certificationDate', 'certificationNo',
    'disabilityLevel', 'assessmentDate', 'medicalMonths', 'medicalPeriodEnd',
    'description', 'attachments', 'reminderDate',
  ]
  for (const f of fields) {
    if (data[f] !== undefined) {
      updateData[f] = data[f] === null ? null : (data[f] instanceof Date || f === 'injuryDescription' || f === 'certificationNo' || f === 'description' || f === 'type' || f === 'status' || f === 'attachments' ? data[f] : new Date(data[f]))
    }
  }

  // 三期自动计算
  if (data.type === 'PREGNANCY' && data.expectedDueDate) {
    const dates = calculatePregnancyDates(new Date(data.expectedDueDate))
    updateData.maternityLeaveStart = dates.maternityLeaveStart
    updateData.maternityLeaveEnd = dates.maternityLeaveEnd
    updateData.nursingEndDate = dates.nursingEndDate
  }

  // 医疗期自动计算截止日
  if (data.type === 'MEDICAL_PERIOD' && data.startDate && data.medicalMonths) {
    const end = new Date(data.startDate)
    end.setMonth(end.getMonth() + data.medicalMonths)
    updateData.medicalPeriodEnd = end
  }

  // 记录时间线
  const actions: string[] = []
  if (data.status && data.status !== existing.status) {
    actions.push(`状态变更为: ${STATUS_LABELS[data.status] || data.status}`)
  }
  if (data.certificationDate && !existing.certificationDate) {
    actions.push('工伤认定完成')
  }
  if (data.assessmentDate && !existing.assessmentDate) {
    actions.push('伤残鉴定完成')
  }
  if (data.actualEndDate && !existing.actualEndDate) {
    actions.push('状态结束')
  }
  if (actions.length === 0) {
    actions.push('更新记录')
  }
  updateData.timeline = addTimelineEntry(existing.timeline, actions.join('; '), userId)

  const record = await (prisma as any).employeeSpecialStatus.update({
    where: { id },
    data: updateData,
  })

  // 如果状态变为 RESOLVED，同步 Employee 布尔字段
  if (data.status === 'RESOLVED' && existing.status !== 'RESOLVED') {
    await syncEmployeeFlags(existing.employeeId, existing.type, false)
  }

  return record
}

/**
 * 删除特殊状态记录
 */
export async function deleteSpecialStatus(orgId: string, id: string) {
  const existing = await (prisma as any).employeeSpecialStatus.findFirst({
    where: { id, orgId },
  })
  if (!existing) {
    throw { code: 'NOT_FOUND', message: '记录不存在' }
  }

  await (prisma as any).employeeSpecialStatus.delete({ where: { id } })

  // 同步 Employee 布尔字段
  if (existing.status === 'ACTIVE') {
    await syncEmployeeFlags(existing.employeeId, existing.type, false)
  }

  return { id }
}

/**
 * 同步 Employee 表的布尔标记字段
 */
async function syncEmployeeFlags(employeeId: string, type: string, active: boolean) {
  const updateData: any = {}
  if (type === 'PREGNANCY') updateData.isPregnant = active
  if (type === 'MEDICAL_PERIOD') updateData.isInMedicalPeriod = active
  if (type === 'WORK_INJURY') updateData.isWorkInjured = active

  if (Object.keys(updateData).length > 0) {
    await prisma.employee.update({ where: { id: employeeId }, data: updateData })
  }
}

/**
 * 获取需要提醒的特殊状态列表
 */
export async function getPendingReminders(orgId: string) {
  const now = new Date()
  const soon = new Date()
  soon.setDate(soon.getDate() + 7)

  return (prisma as any).employeeSpecialStatus.findMany({
    where: {
      orgId,
      status: 'ACTIVE',
      reminderDate: { gte: now, lte: soon },
    },
    include: {
      employee: { select: { id: true, name: true, department: true, phone: true } },
    },
    orderBy: { reminderDate: 'asc' },
  })
}