import { NextResponse } from 'next/server';
import prisma from '@/lib/prisma';

export const dynamic = 'force-dynamic';

export async function GET() {
  try {
    // 1. Get all notes
    const notes = await prisma.note.findMany({
      select: { labels: true }
    });

    // 2. Extract all unique labels from JSON
    const uniqueLabels = new Set<string>();
    notes.forEach((note: any) => {
      if (note.labels) {
        try {
          const parsed = JSON.parse(note.labels);
          if (Array.isArray(parsed)) {
            parsed.forEach((l: string) => uniqueLabels.add(l));
          }
        } catch (e) {
          // ignore error
        }
      }
    });

    // 3. Get existing labels in DB
    const existingDbLabels = await prisma.label.findMany();
    const existingNames = new Set(existingDbLabels.map((l: any) => l.name));

    // 4. Create missing labels
    const created = [];
    for (const name of uniqueLabels) {
      if (!existingNames.has(name)) {
        const newLabel = await prisma.label.create({
          data: {
            name,
            color: 'gray' // Default color
          }
        });
        created.push(newLabel);
      }
    }

    return NextResponse.json({
      success: true,
      foundInNotes: uniqueLabels.size,
      alreadyInDb: existingNames.size,
      created: created.length,
      createdLabels: created
    });

  } catch (error) {
    return NextResponse.json({ error: String(error) }, { status: 500 });
  }
}