/**
 * 一次性迁移脚本：为现有员工创建初始版本记录
 * 运行方式：npx tsx scripts/migrate-records.ts
 */
import prisma from '../src/lib/prisma.js'
import { decrypt } from '../src/lib/crypto.js'

function dateToMonth(date: Date): string {
  const y = date.getFullYear()
  const m = String(date.getMonth() + 1).padStart(2, '0')
  return `${y}-${m}`
}

function prevMonth(month: string): string {
  const [y, m] = month.split('-').map(Number)
  const d = new Date(y, m - 2, 1)
  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}`
}

async function main() {
  const employees = await prisma.employee.findMany({
    include: {
      terminations: { orderBy: { terminationDate: 'desc' }, take: 1 },
      salaryChanges: { orderBy: { createdAt: 'desc' }, take: 1 },
      socialInsRecords: { take: 1 },
      housingFundRecords: { take: 1 },
      departmentRecords: { take: 1 },
    },
  })

  console.log(`Found ${employees.length} employees to migrate`)

  for (const emp of employees) {
    const hireMonth = dateToMonth(emp.hireDate)
    const termination = emp.terminations[0]
    const endMonth = termination ? dateToMonth(termination.terminationDate) : null

    // 解密月薪获取数值
    let salaryNum = 0
    try {
      salaryNum = parseFloat(decrypt(emp.monthlySalary)) || 0
    } catch {
      salaryNum = parseFloat(emp.monthlySalary) || 0
    }

    const socialInsBase = emp.socialInsBase ?? salaryNum
    const housingFundBase = emp.housingFundBase ?? salaryNum

    // 1. 社保缴费记录（仅当尚无记录时创建）
    if (emp.socialInsRecords.length === 0) {
      await prisma.employeeSocialInsRecord.create({
        data: {
          orgId: emp.orgId,
          employeeId: emp.id,
          startMonth: emp.socialInsStartMonth || hireMonth,
          endMonth: endMonth || emp.socialInsEndMonth || null,
          base: socialInsBase,
          changeType: 'ONBOARDING',
          createdBy: emp.createdBy,
        },
      })
    }

    // 2. 公积金缴费记录
    if (emp.housingFundRecords.length === 0) {
      await prisma.employeeHousingFundRecord.create({
        data: {
          orgId: emp.orgId,
          employeeId: emp.id,
          startMonth: emp.housingFundStartMonth || hireMonth,
          endMonth: endMonth || emp.housingFundEndMonth || null,
          base: housingFundBase,
          changeType: 'ONBOARDING',
          createdBy: emp.createdBy,
        },
      })
    }

    // 3. 薪资变更记录（仅当尚无记录时创建）
    if (emp.salaryChanges.length === 0) {
      await prisma.salaryChangeRecord.create({
        data: {
          orgId: emp.orgId,
          employeeId: emp.id,
          oldSalary: 0,
          newSalary: salaryNum,
          effectiveDate: emp.hireDate,
          effectiveMonth: hireMonth,
          endMonth: null,
          changeType: 'ONBOARDING',
          createdBy: emp.createdBy,
        },
      })
    } else {
      // 已有记录但缺少 effectiveMonth/endMonth/changeType，补充
      const latest = emp.salaryChanges[0]
      if (!latest.effectiveMonth || !latest.changeType) {
        await prisma.salaryChangeRecord.update({
          where: { id: latest.id },
          data: {
            effectiveMonth: dateToMonth(latest.effectiveDate),
            changeType: latest.changeType || 'SALARY_CHANGE',
          },
        })
      }
    }

    // 4. 部门变更记录
    if (emp.departmentRecords.length === 0) {
      await prisma.employeeDepartmentRecord.create({
        data: {
          orgId: emp.orgId,
          employeeId: emp.id,
          oldDepartment: '',
          newDepartment: emp.department,
          effectiveMonth: hireMonth,
          endMonth: null,
          changeType: 'ONBOARDING',
          createdBy: emp.createdBy,
        },
      })
    }

    // 5. 同步 Employee 便捷字段
    await prisma.employee.update({
      where: { id: emp.id },
      data: {
        socialInsStartMonth: emp.socialInsStartMonth || hireMonth,
        socialInsEndMonth: endMonth || emp.socialInsEndMonth || null,
        socialInsBase,
        housingFundStartMonth: emp.housingFundStartMonth || hireMonth,
        housingFundEndMonth: endMonth || emp.housingFundEndMonth || null,
        housingFundBase,
      },
    })

    console.log(`  ✓ ${emp.name} (${emp.department}) — records created/synced`)
  }

  console.log('\nMigration complete!')
}

main()
  .catch((e) => {
    console.error('Migration failed:', e)
    process.exit(1)
  })
  .finally(async () => {
    await prisma.$disconnect()
  })