import { FreshContext, Handlers } from "$fresh/server.ts";
import { db } from "$root/databases/db.ts";
import { enseignements } from "$root/databases/schema.ts";
import { AuthenticatedState } from "$root/defaults/interfaces.ts";
import { and, eq } from "npm:drizzle-orm@0.45.2";

const NOT_FOUND = new Response(
  JSON.stringify({ error: "Ressource introuvable" }),
  { status: 404, headers: { "content-type": "application/json" } },
);

const FORBIDDEN = new Response(null, { status: 403 });

const CONFLICT = new Response(
  JSON.stringify({ error: "Cet enseignement existe déjà." }),
  { status: 409, headers: { "content-type": "application/json" } },
);

export const handler: Handlers<null, AuthenticatedState> = {
  // #29 POST /enseignements
  async POST(
    request: Request,
    context: FreshContext<AuthenticatedState>,
  ): Promise<Response> {
    if (context.state.session.eduPersonPrimaryAffiliation !== "employee") {
      return FORBIDDEN;
    }

    const body: {
      idProf: string;
      idModule: string;
      idPromo: string;
    } = await request.json();

    if (!body.idProf || !body.idModule || !body.idPromo) {
      return new Response(null, { status: 400 });
    }

    // Check if enseignement already exists
    const existing = await db
      .select()
      .from(enseignements)
      .where(
        and(
          eq(enseignements.idProf, body.idProf),
          eq(enseignements.idModule, body.idModule),
          eq(enseignements.idPromo, body.idPromo),
        ),
      )
      .then((rows) => rows[0] ?? null);

    if (existing) {
      return CONFLICT;
    }

    const [created] = await db
      .insert(enseignements)
      .values({
        idProf: body.idProf,
        idModule: body.idModule,
        idPromo: body.idPromo,
      })
      .returning();

    return new Response(JSON.stringify(created), {
      status: 201,
      headers: { "content-type": "application/json" },
    });
  },
};