import { NextResponse } from "next/server";
import { getServerSession } from "next-auth/next";
import { authOptions } from "@/app/api/auth/[...nextauth]/route";
import { PrismaClient } from "@prisma/client";

const prisma = new PrismaClient();

// GET events
export async function GET(req: Request) {
  try {
    const session = await getServerSession(authOptions);
    if (!session) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const { searchParams } = new URL(req.url);
    const start = searchParams.get("start");
    const end = searchParams.get("end");

    // First get all calendars for the user
    const calendars = await prisma.calendar.findMany({
      where: {
        userId: session.user.id,
      },
    });

    // Then get events with calendar information
    const events = await prisma.event.findMany({
      where: {
        calendarId: {
          in: calendars.map(cal => cal.id)
        },
        ...(start && end
          ? {
              start: {
                gte: new Date(start),
              },
              end: {
                lte: new Date(end),
              },
            }
          : {}),
      },
      include: {
        calendar: true,
      },
      orderBy: {
        start: "asc",
      },
    });

    // Map the events to include calendar color and name
    const eventsWithCalendarInfo = events.map(event => ({
      ...event,
      calendarColor: event.calendar.color,
      calendarName: event.calendar.name,
      calendar: undefined, // Remove the full calendar object
    }));

    return NextResponse.json(eventsWithCalendarInfo);
  } catch (error) {
    console.error("Error fetching events:", error);
    return NextResponse.json(
      { error: "Erreur lors du chargement des événements" },
      { status: 500 }
    );
  }
}

// POST new event
export async function POST(req: Request) {
  try {
    const session = await getServerSession(authOptions);
    if (!session?.user) {
      return NextResponse.json(
        { error: "Non autorisé" },
        { status: 401 }
      );
    }

    const data = await req.json();
    const { title, description, start, end, location, calendarId } = data;

    const event = await prisma.event.create({
      data: {
        title,
        description,
        start: new Date(start),
        end: new Date(end),
        isAllDay: data.allDay || false,
        location: location || null,
        calendarId,
      },
    });

    return NextResponse.json(event);
  } catch (error) {
    console.error("Error creating event:", error);
    return NextResponse.json(
      { error: "Erreur lors de la création de l'événement" },
      { status: 500 }
    );
  }
}

// PUT update event
export async function PUT(req: Request) {
  try {
    const session = await getServerSession(authOptions);
    if (!session) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const body = await req.json();
    const { id, ...data } = body;

    const event = await prisma.event.update({
      where: {
        id,
      },
      data,
    });

    return NextResponse.json(event);
  } catch (error) {
    console.error("Error updating event:", error);
    return NextResponse.json(
      { error: "Error updating event" },
      { status: 500 }
    );
  }
}

// DELETE event
export async function DELETE(req: Request) {
  try {
    const session = await getServerSession(authOptions);
    if (!session) {
      return NextResponse.json({ error: "Unauthorized" }, { status: 401 });
    }

    const { searchParams } = new URL(req.url);
    const id = searchParams.get("id");

    if (!id) {
      return NextResponse.json(
        { error: "Event ID is required" },
        { status: 400 }
      );
    }

    await prisma.event.delete({
      where: {
        id,
      },
    });

    return NextResponse.json({ success: true });
  } catch (error) {
    console.error("Error deleting event:", error);
    return NextResponse.json(
      { error: "Error deleting event" },
      { status: 500 }
    );
  }
}