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

/**
 * Handles the GET request to retrieve calendars for the authenticated user.
 *
 * @param {NextRequest} req - The incoming request object.
 * @returns {Promise<NextResponse>} - A promise that resolves to a JSON response containing the calendars or an error message.
 *
 * The function performs the following steps:
 * 1. Retrieves the server session using `getServerSession`.
 * 2. Checks if the user is authenticated by verifying the presence of `session.user.username`.
 *    - If not authenticated, returns a 401 response with an error message.
 * 3. Attempts to fetch the calendars associated with the authenticated user from the database.
 *    - If successful, returns the calendars in a JSON response.
 *    - If an error occurs during the database query, logs the error and returns a 500 response with an error message.
 */
export async function GET(req: NextRequest) {
  const session = await getServerSession(authOptions);

  if (!session?.user?.username) {
    return NextResponse.json({ error: "Non authentifié" }, { status: 401 });
  }

  try {
    const calendars = await prisma.calendar.findMany({
      where: {
        userId: session.user.username,
      },
      orderBy: {
        createdAt: "desc",
      },
    });

    return NextResponse.json(calendars);
  } catch (error) {
    console.error("Erreur lors de la récupération des calendriers:", error);
    return NextResponse.json({ error: "Erreur serveur" }, { status: 500 });
  }
}

/**
 * Handles the POST request to create a new calendar.
 *
 * @param {NextRequest} req - The incoming request object.
 * @returns {Promise<NextResponse>} The response object containing the created calendar or an error message.
 *
 * @throws {Error} If there is an issue with the request or server.
 *
 * The function performs the following steps:
 * 1. Retrieves the server session using `getServerSession`.
 * 2. Checks if the user is authenticated by verifying the presence of `session.user.username`.
 * 3. Parses the request body to extract `name`, `color`, and `description`.
 * 4. Validates that the `name` field is provided.
 * 5. Creates a new calendar entry in the database using Prisma.
 * 6. Returns the created calendar with a 201 status code.
 * 7. Catches and logs any errors, returning a 500 status code with an error message.
 */
export async function POST(req: NextRequest) {
  const session = await getServerSession(authOptions);

  if (!session?.user?.username) {
    return NextResponse.json({ error: "Non authentifié" }, { status: 401 });
  }

  try {
    const { name, color, description } = await req.json();

    // Validation
    if (!name) {
      return NextResponse.json(
        { error: "Le nom du calendrier est requis" },
        { status: 400 }
      );
    }

    const calendar = await prisma.calendar.create({
      data: {
        name,
        color: color || "#0082c9",
        description,
        userId: session.user.username,
      },
    });

    return NextResponse.json(calendar, { status: 201 });
  } catch (error) {
    console.error("Erreur lors de la création du calendrier:", error);
    return NextResponse.json({ error: "Erreur serveur" }, { status: 500 });
  }
}