import { NextRequest, NextResponse } from 'next/server'
import prisma from '@/lib/prisma'
import { auth } from '@/auth'

const COLORS = ['red', 'orange', 'yellow', 'green', 'teal', 'blue', 'purple', 'pink', 'gray'];

// GET /api/labels - Get all labels
export async function GET(request: NextRequest) {
  const session = await auth();
  if (!session?.user?.id) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  try {
    const labels = await prisma.label.findMany({
      where: { userId: session.user.id },
      orderBy: { name: 'asc' }
    })

    return NextResponse.json({
      success: true,
      data: labels
    })
  } catch (error) {
    console.error('GET /api/labels error:', error)
    return NextResponse.json(
      { success: false, error: 'Failed to fetch labels' },
      { status: 500 }
    )
  }
}

// POST /api/labels - Create a new label
export async function POST(request: NextRequest) {
  const session = await auth();
  if (!session?.user?.id) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  try {
    const body = await request.json()
    const { name, color } = body

    if (!name || typeof name !== 'string') {
      return NextResponse.json(
        { success: false, error: 'Label name is required' },
        { status: 400 }
      )
    }

    // Check if label already exists for this user
    const existing = await prisma.label.findUnique({
      where: {
        name_userId: {
          name: name.trim(),
          userId: session.user.id
        }
      }
    })

    if (existing) {
      return NextResponse.json(
        { success: false, error: 'Label already exists' },
        { status: 409 }
      )
    }

    const label = await prisma.label.create({
      data: {
        name: name.trim(),
        color: color || COLORS[Math.floor(Math.random() * COLORS.length)],
        userId: session.user.id
      }
    })

    return NextResponse.json({
      success: true,
      data: label
    })
  } catch (error) {
    console.error('POST /api/labels error:', error)
    return NextResponse.json(
      { success: false, error: 'Failed to create label' },
      { status: 500 }
    )
  }
}