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

export const handler: Handlers<null, AuthenticatedState> = {
  // #7 GET /students
  async GET(
    request: Request,
    context: FreshContext<AuthenticatedState>,
  ): Promise<Response> {
    if (!isEmployee(context.state.session)) {
      return new Response(JSON.stringify([]), {
        headers: { "content-type": "application/json" },
      });
    }

    const url = new URL(request.url);
    const idPromo = url.searchParams.get("idPromo");

    const rows = idPromo
      ? await db.select().from(students).where(eq(students.idPromo, idPromo))
      : await db.select().from(students);

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

  // #8 POST /students
  async POST(
    request: Request,
    context: FreshContext<AuthenticatedState>,
  ): Promise<Response> {
    if (!isEmployee(context.state.session)) {
      return new Response(null, { status: 403 });
    }

    const body: {
      numEtud: number;
      nom: string;
      prenom: string;
      idPromo: string;
    } = await request.json();

    if (!body.nom || !body.prenom) {
      return new Response(null, { status: 400 });
    }

    const values: {
      numEtud?: number;
      nom: string;
      prenom: string;
      idPromo?: string;
    } = {
      nom: body.nom,
      prenom: body.prenom,
    };
    if (body.numEtud) values.numEtud = body.numEtud;
    if (body.idPromo) values.idPromo = body.idPromo;

    const [created] = await db
      .insert(students)
      .values(values)
      .returning();

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