import { NextRequest, NextResponse } from "next/server";
import { getServerSession } from "next-auth/next";
import { authOptions } from "@/app/api/auth/options";
import { prisma } from "@/lib/prisma";
import { discoverMicrosoftCalendars } from "@/lib/services/microsoft-calendar-sync";
import { logger } from "@/lib/logger";

/**
 * Discover calendars for a Microsoft account
 * POST /api/calendars/sync/discover-microsoft
 */
export async function POST(req: NextRequest) {
  try {
    const session = await getServerSession(authOptions);
    if (!session?.user?.id) {
      return NextResponse.json({ error: "Non authentifié" }, { status: 401 });
    }

    const { mailCredentialId } = await req.json();

    if (!mailCredentialId) {
      return NextResponse.json(
        { error: "mailCredentialId est requis" },
        { status: 400 }
      );
    }

    // Get mail credentials
    const mailCreds = await prisma.mailCredentials.findFirst({
      where: {
        id: mailCredentialId,
        userId: session.user.id,
      },
    });

    if (!mailCreds) {
      return NextResponse.json(
        { error: "Credentials non trouvés" },
        { status: 404 }
      );
    }

    // Check if it's a Microsoft account
    if (!mailCreds.host.includes('outlook.office365.com') || !mailCreds.use_oauth) {
      return NextResponse.json(
        { error: "Ce compte n'est pas un compte Microsoft OAuth" },
        { status: 400 }
      );
    }

    if (!mailCreds.refresh_token) {
      return NextResponse.json(
        { error: "Refresh token requis pour la synchronisation Microsoft" },
        { status: 400 }
      );
    }

    // Discover calendars
    const calendars = await discoverMicrosoftCalendars(
      session.user.id,
      mailCreds.email
    );

    logger.info('Microsoft calendars discovered', {
      userId: session.user.id,
      email: mailCreds.email,
      calendarsCount: calendars.length,
    });

    return NextResponse.json({ calendars });
  } catch (error) {
    logger.error('Error discovering Microsoft calendars', {
      error: error instanceof Error ? error.message : String(error),
    });
    return NextResponse.json(
      {
        error: "Erreur lors de la découverte des calendriers",
        details: error instanceof Error ? error.message : String(error),
      },
      { status: 500 }
    );
  }
}