import { NextRequest, NextResponse } from 'next/server'
import { prisma } from '@/lib/prisma'
import { RelationshipCalculator } from '@/lib/relationship-calculator'

/**
 * 计算两个成员之间的关系
 * GET /api/trees/[treeId]/relationship?from=xxx&to=yyy
 */
export async function GET(
  request: NextRequest,
  { params }: { params: Promise<{ treeId: string }> }
) {
  const { treeId } = await params
  try {
    const { searchParams } = new URL(request.url)
    const fromId = searchParams.get('from')
    const toId = searchParams.get('to')

    if (!fromId || !toId) {
      return NextResponse.json(
        { error: '缺少参数：from 和 to' },
        { status: 400 }
      )
    }

    // 获取家族树的所有成员
    const members = await prisma.familyMember.findMany({
      where: { treeId }
    })

    if (members.length === 0) {
      return NextResponse.json(
        { error: '家族树不存在或没有成员' },
        { status: 404 }
      )
    }

    // 计算关系
    const calculator = new RelationshipCalculator(members as any)
    const result = calculator.getRelationshipDetail(fromId, toId)

    // 获取成员信息
    const fromMember = members.find(m => m.id === fromId)
    const toMember = members.find(m => m.id === toId)

    return NextResponse.json({
      from: {
        id: fromMember?.id,
        name: fromMember?.fullName
      },
      to: {
        id: toMember?.id,
        name: toMember?.fullName
      },
      relationship: result.term,
      path: result.path,
      description: result.description,
      success: result.success
    })
  } catch (error) {
    console.error('计算关系失败:', error)
    return NextResponse.json(
      { error: '计算关系失败' },
      { status: 500 }
    )
  }
}