import { NextResponse } from 'next/server';
import { auth } from '@/lib/auth';
import { createOKR } from '@/services/okrs';
import { getTeamMemberById, isTeamAdmin } from '@/services/teams';
import type { CreateOKRInput, CreateKeyResultInput } from '@/lib/types';

export async function POST(request: Request) {
  try {
    const session = await auth();

    if (!session?.user?.id) {
      return NextResponse.json({ error: 'Non autorisé' }, { status: 401 });
    }

    const body = await request.json();
    const { teamMemberId, objective, description, period, startDate, endDate, keyResults } =
      body as CreateOKRInput & {
        startDate: string | Date;
        endDate: string | Date;
      };

    if (!teamMemberId || !objective || !period || !startDate || !endDate || !keyResults) {
      return NextResponse.json({ error: 'Champs requis manquants' }, { status: 400 });
    }

    // Get team member to check permissions
    const teamMember = await getTeamMemberById(teamMemberId);
    if (!teamMember) {
      return NextResponse.json({ error: "Membre de l'équipe non trouvé" }, { status: 404 });
    }

    // Check if user is admin of the team
    const isAdmin = await isTeamAdmin(teamMember.team.id, session.user.id);
    if (!isAdmin) {
      return NextResponse.json(
        { error: 'Seuls les administrateurs peuvent créer des OKRs' },
        { status: 403 }
      );
    }

    // Convert dates to Date objects if they are strings
    const startDateObj = startDate instanceof Date ? startDate : new Date(startDate);
    const endDateObj = endDate instanceof Date ? endDate : new Date(endDate);

    // Validate dates
    if (isNaN(startDateObj.getTime()) || isNaN(endDateObj.getTime())) {
      return NextResponse.json({ error: 'Dates invalides' }, { status: 400 });
    }

    // Ensure all key results have a unit and order
    const keyResultsWithUnit = keyResults.map((kr: CreateKeyResultInput, index: number) => ({
      ...kr,
      unit: kr.unit || '%',
      order: kr.order !== undefined ? kr.order : index,
    }));

    const okr = await createOKR(
      teamMemberId,
      objective,
      description || null,
      period,
      startDateObj,
      endDateObj,
      keyResultsWithUnit
    );

    return NextResponse.json(okr, { status: 201 });
  } catch (error) {
    console.error('Error creating OKR:', error);
    const errorMessage =
      error instanceof Error ? error.message : "Erreur lors de la création de l'OKR";
    return NextResponse.json({ error: errorMessage }, { status: 500 });
  }
}