import { NextRequest, NextResponse } from "next/server"
import { getServerSession } from "next-auth"
import { authOptions } from "@/lib/auth"
import { prisma } from "@/lib/prisma"
import { checkPermission } from "@/lib/permissions"
import { Role } from "@prisma/client"

// 获取单个成员
export async function GET(
  req: NextRequest,
  { params }: { params: Promise<{ treeId: string; memberId: string }> }
) {
  try {
    const session = await getServerSession(authOptions)
    
    if (!session?.user?.id) {
      return NextResponse.json({ error: "未授权" }, { status: 401 })
    }

    const { treeId, memberId } = await params

    // 检查权限
    const { hasPermission } = await checkPermission(session.user.id, treeId)
    if (!hasPermission) {
      return NextResponse.json({ error: "无权访问此家族树" }, { status: 403 })
    }

    const member = await prisma.familyMember.findFirst({
      where: {
        id: memberId,
        treeId,
      }
    })

    if (!member) {
      return NextResponse.json({ error: "成员不存在" }, { status: 404 })
    }

    return NextResponse.json({ member })
  } catch (error) {
    console.error("获取成员失败:", error)
    return NextResponse.json(
      { error: "获取成员失败" },
      { status: 500 }
    )
  }
}

// 更新成员
export async function PATCH(
  req: NextRequest,
  { params }: { params: Promise<{ treeId: string; memberId: string }> }
) {
  try {
    const session = await getServerSession(authOptions)
    
    if (!session?.user?.id) {
      return NextResponse.json({ error: "未授权" }, { status: 401 })
    }

    const { treeId, memberId } = await params

    // 检查权限（需要 EDITOR 权限）
    const { hasPermission } = await checkPermission(session.user.id, treeId, Role.EDITOR)
    if (!hasPermission) {
      return NextResponse.json({ error: "无权限修改成员" }, { status: 403 })
    }

    const body = await req.json()

    // 检查成员是否存在
    const existingMember = await prisma.familyMember.findFirst({
      where: {
        id: memberId,
        treeId,
      }
    })

    if (!existingMember) {
      return NextResponse.json({ error: "成员不存在" }, { status: 404 })
    }

    const member = await prisma.familyMember.update({
      where: { id: memberId },
      data: {
        ...body,
        updatedAt: new Date(),
      }
    })

    // 维护配偶双向关系
    if (body.spouseIds !== undefined) {
      const newSpouseIds = body.spouseIds || []
      const oldSpouseIds = existingMember.spouseIds || []
      
      // 添加新配偶的反向关系
      for (const spouseId of newSpouseIds) {
        if (!oldSpouseIds.includes(spouseId)) {
          const spouse = await prisma.familyMember.findUnique({
            where: { id: spouseId }
          })
          
          if (spouse && !spouse.spouseIds.includes(memberId)) {
            await prisma.familyMember.update({
              where: { id: spouseId },
              data: {
                spouseIds: [...spouse.spouseIds, memberId]
              }
            })
          }
        }
      }
      
      // 移除旧配偶的反向关系
      for (const oldSpouseId of oldSpouseIds) {
        if (!newSpouseIds.includes(oldSpouseId)) {
          const spouse = await prisma.familyMember.findUnique({
            where: { id: oldSpouseId }
          })
          
          if (spouse && spouse.spouseIds.includes(memberId)) {
            await prisma.familyMember.update({
              where: { id: oldSpouseId },
              data: {
                spouseIds: spouse.spouseIds.filter(id => id !== memberId)
              }
            })
          }
        }
      }
    }

    // 维护父母-子女双向关系
    // 1. 处理父亲关系变化
    if (body.fatherId !== undefined) {
      const oldFatherId = existingMember.fatherId
      const newFatherId = body.fatherId
      
      // 从旧父亲的子女列表中移除
      if (oldFatherId && oldFatherId !== newFatherId) {
        const oldFather = await prisma.familyMember.findUnique({
          where: { id: oldFatherId }
        })
        if (oldFather && oldFather.childrenIds.includes(memberId)) {
          await prisma.familyMember.update({
            where: { id: oldFatherId },
            data: {
              childrenIds: oldFather.childrenIds.filter(id => id !== memberId)
            }
          })
        }
      }
      
      // 添加到新父亲的子女列表
      if (newFatherId && newFatherId !== oldFatherId) {
        const newFather = await prisma.familyMember.findUnique({
          where: { id: newFatherId }
        })
        if (newFather && !newFather.childrenIds.includes(memberId)) {
          await prisma.familyMember.update({
            where: { id: newFatherId },
            data: {
              childrenIds: [...newFather.childrenIds, memberId]
            }
          })
        }
      }
    }

    // 2. 处理母亲关系变化
    if (body.motherId !== undefined) {
      const oldMotherId = existingMember.motherId
      const newMotherId = body.motherId
      
      // 从旧母亲的子女列表中移除
      if (oldMotherId && oldMotherId !== newMotherId) {
        const oldMother = await prisma.familyMember.findUnique({
          where: { id: oldMotherId }
        })
        if (oldMother && oldMother.childrenIds.includes(memberId)) {
          await prisma.familyMember.update({
            where: { id: oldMotherId },
            data: {
              childrenIds: oldMother.childrenIds.filter(id => id !== memberId)
            }
          })
        }
      }
      
      // 添加到新母亲的子女列表
      if (newMotherId && newMotherId !== oldMotherId) {
        const newMother = await prisma.familyMember.findUnique({
          where: { id: newMotherId }
        })
        if (newMother && !newMother.childrenIds.includes(memberId)) {
          await prisma.familyMember.update({
            where: { id: newMotherId },
            data: {
              childrenIds: [...newMother.childrenIds, memberId]
            }
          })
        }
      }
    }

    // 3. 处理子女关系变化
    if (body.childrenIds !== undefined) {
      const newChildrenIds = body.childrenIds || []
      const oldChildrenIds = existingMember.childrenIds || []
      
      // 添加新子女的父母关系
      for (const childId of newChildrenIds) {
        if (!oldChildrenIds.includes(childId)) {
          const child = await prisma.familyMember.findUnique({
            where: { id: childId }
          })
          
          if (child) {
            // 根据当前成员的性别设置为父亲或母亲
            if (member.gender === 'MALE' && !child.fatherId) {
              await prisma.familyMember.update({
                where: { id: childId },
                data: { fatherId: memberId }
              })
            } else if (member.gender === 'FEMALE' && !child.motherId) {
              await prisma.familyMember.update({
                where: { id: childId },
                data: { motherId: memberId }
              })
            }
          }
        }
      }
      
      // 移除旧子女的父母关系
      for (const oldChildId of oldChildrenIds) {
        if (!newChildrenIds.includes(oldChildId)) {
          const child = await prisma.familyMember.findUnique({
            where: { id: oldChildId }
          })
          
          if (child) {
            // 根据当前成员的性别移除父亲或母亲
            if (member.gender === 'MALE' && child.fatherId === memberId) {
              await prisma.familyMember.update({
                where: { id: oldChildId },
                data: { fatherId: null }
              })
            } else if (member.gender === 'FEMALE' && child.motherId === memberId) {
              await prisma.familyMember.update({
                where: { id: oldChildId },
                data: { motherId: null }
              })
            }
          }
        }
      }
    }

    // 记录操作日志
    await prisma.activityLog.create({
      data: {
        treeId,
        userId: session.user.id,
        action: 'UPDATE',
        entityType: 'MEMBER',
        entityId: member.id,
        entityName: member.fullName,
        changes: body,
      }
    })

    return NextResponse.json({ member })
  } catch (error) {
    console.error("更新成员失败:", error)
    return NextResponse.json(
      { error: "更新成员失败" },
      { status: 500 }
    )
  }
}

// 删除成员
export async function DELETE(
  req: NextRequest,
  { params }: { params: Promise<{ treeId: string; memberId: string }> }
) {
  try {
    const session = await getServerSession(authOptions)
    
    if (!session?.user?.id) {
      return NextResponse.json({ error: "未授权" }, { status: 401 })
    }

    const { treeId, memberId } = await params

    // 检查权限（需要 EDITOR 权限）
    const { hasPermission } = await checkPermission(session.user.id, treeId, Role.EDITOR)
    if (!hasPermission) {
      return NextResponse.json({ error: "无权限删除成员" }, { status: 403 })
    }

    // 检查成员是否存在
    const existingMember = await prisma.familyMember.findFirst({
      where: {
        id: memberId,
        treeId,
      }
    })

    if (!existingMember) {
      return NextResponse.json({ error: "成员不存在" }, { status: 404 })
    }

    await prisma.familyMember.delete({
      where: { id: memberId }
    })

    // 记录操作日志
    await prisma.activityLog.create({
      data: {
        treeId,
        userId: session.user.id,
        action: 'DELETE',
        entityType: 'MEMBER',
        entityId: memberId,
        entityName: existingMember.fullName,
      }
    })

    return NextResponse.json({ success: true })
  } catch (error) {
    console.error("删除成员失败:", error)
    return NextResponse.json(
      { error: "删除成员失败" },
      { status: 500 }
    )
  }
}