import { NextRequest, NextResponse } from 'next/server'
import { getSession } from '@/lib/auth'
import { prisma } from '@/lib/db'
import { featureSchema } from '@/lib/validations'
import { getProjectWithTenantCheck } from '@/lib/tenant'

export async function GET(
  request: NextRequest,
  { params }: { params: { id: string } }
) {
  try {
    const user = await getSession()
    if (!user) {
      return NextResponse.json({ error: 'Nicht autorisiert' }, { status: 401 })
    }

    const project = await getProjectWithTenantCheck(params.id, user)
    if (!project) {
      return NextResponse.json({ error: 'Projekt nicht gefunden' }, { status: 404 })
    }

    const features = await (prisma as any).feature.findMany({
      where: { projectId: params.id },
      orderBy: { createdAt: 'asc' },
    })

    return NextResponse.json({ features })
  } catch (error) {
    console.error('Error fetching features:', error)
    return NextResponse.json({ error: 'Serverfehler' }, { status: 500 })
  }
}

export async function POST(
  request: NextRequest,
  { params }: { params: { id: string } }
) {
  try {
    const user = await getSession()
    if (!user) {
      return NextResponse.json({ error: 'Nicht autorisiert' }, { status: 401 })
    }

    if (user.role === 'VIEWER') {
      return NextResponse.json({ error: 'Keine Berechtigung' }, { status: 403 })
    }

    const project = await getProjectWithTenantCheck(params.id, user)
    if (!project) {
      return NextResponse.json({ error: 'Projekt nicht gefunden' }, { status: 404 })
    }

    if (project.isLocked && user.role !== 'SERVER_ADMIN') {
      return NextResponse.json({ error: 'Projekt ist gesperrt' }, { status: 403 })
    }

    const body = await request.json()
    const validated = featureSchema.safeParse(body)
    
    if (!validated.success) {
      return NextResponse.json(
        { error: 'Ungültige Eingabedaten', details: validated.error.flatten() },
        { status: 400 }
      )
    }

    const feature = await (prisma as any).feature.create({
      data: {
        projectId: params.id,
        type: validated.data.type,
        geometry: validated.data.geometry,
        properties: validated.data.properties || {},
      },
    })

    return NextResponse.json({ feature }, { status: 201 })
  } catch (error) {
    console.error('Error creating feature:', error)
    return NextResponse.json({ error: 'Serverfehler' }, { status: 500 })
  }
}

export async function PUT(
  request: NextRequest,
  { params }: { params: { id: string } }
) {
  try {
    const user = await getSession()
    if (!user) {
      return NextResponse.json({ error: 'Nicht autorisiert' }, { status: 401 })
    }

    if (user.role === 'VIEWER') {
      return NextResponse.json({ error: 'Keine Berechtigung' }, { status: 403 })
    }

    const project = await getProjectWithTenantCheck(params.id, user)
    if (!project) {
      const exists = await (prisma as any).project.findUnique({ where: { id: params.id }, select: { id: true, tenantId: true, ownerId: true } })
      if (!exists) {
        console.warn(`[Features PUT] Project ${params.id} not in DB`)
        return NextResponse.json({ error: 'Projekt nicht gefunden' }, { status: 404 })
      }
      console.warn(`[Features PUT] Access denied: user=${user.id} tenant=${user.tenantId}, project owner=${exists.ownerId} tenant=${exists.tenantId}`)
      return NextResponse.json({ error: 'Keine Berechtigung für dieses Projekt' }, { status: 403 })
    }

    if (project.isLocked && user.role !== 'SERVER_ADMIN') {
      return NextResponse.json({ error: 'Projekt ist gesperrt' }, { status: 403 })
    }

    const body = await request.json()
    const { features } = body as { features: Array<{ id?: string; type: string; geometry: object; properties?: object }> }

    await (prisma as any).feature.deleteMany({
      where: { projectId: params.id },
    })

    if (features && features.length > 0) {
      await (prisma as any).feature.createMany({
        data: features.map((f: any) => ({
          projectId: params.id,
          type: f.type,
          geometry: f.geometry,
          properties: f.properties || {},
        })),
      })
    }

    const updatedFeatures = await (prisma as any).feature.findMany({
      where: { projectId: params.id },
    })

    return NextResponse.json({ features: updatedFeatures })
  } catch (error) {
    console.error('Error updating features:', error)
    return NextResponse.json({ error: 'Serverfehler' }, { status: 500 })
  }
}