import { NextResponse } from 'next/server';
import { getServerSession } from 'next-auth';
import { authOptions } from '@/app/api/auth/[...nextauth]/route';
import { toggleEmailFlag } from '@/lib/services/email-service';
import { invalidateEmailContentCache, invalidateFolderCache } from '@/lib/redis';

export async function POST(
  request: Request,
  context: { params: { id: string } }
) {
  try {
    const session = await getServerSession(authOptions);
    if (!session || !session.user?.id) {
      return NextResponse.json(
        { error: "Not authenticated" },
        { status: 401 }
      );
    }

    // Await params as per Next.js requirements
    const params = await context.params;
    const id = params?.id;
    if (!id) {
      return NextResponse.json(
        { error: "Missing email ID" },
        { status: 400 }
      );
    }

    const { flagged, folder, accountId } = await request.json();
    
    if (typeof flagged !== 'boolean') {
      return NextResponse.json(
        { error: "Invalid 'flagged' parameter. Must be a boolean." },
        { status: 400 }
      );
    }

    const normalizedFolder = folder || "INBOX";
    const effectiveAccountId = accountId || 'default';

    // Use the email service to toggle the flag
    // Note: You'll need to implement this function in email-service.ts
    const success = await toggleEmailFlag(
      session.user.id,
      id,
      flagged,
      normalizedFolder,
      effectiveAccountId
    );

    if (!success) {
      return NextResponse.json(
        { error: `Failed to ${flagged ? 'star' : 'unstar'} email` },
        { status: 500 }
      );
    }

    // Invalidate cache for this email
    await invalidateEmailContentCache(session.user.id, effectiveAccountId, id);
    
    return NextResponse.json({ success: true });
  } catch (error: any) {
    console.error("Error in flag API:", error);
    return NextResponse.json(
      { error: "Internal server error", message: error.message },
      { status: 500 }
    );
  }
}