import { FreshContext, Handlers } from "$fresh/server.ts";
import { db } from "$root/databases/db.ts";
import { promotions } from "$root/databases/schema.ts";
import { AuthenticatedState } from "$root/defaults/interfaces.ts";
import { withRules } from "$root/defaults/withRules.ts";
import { 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" } },
);

export const handler: Handlers<null, AuthenticatedState> = {
  // #15 GET /promotions/{idPromo}
  GET: withRules(["student_read"])(async (_request, context) => {
    const promo = await db
      .select()
      .from(promotions)
      .where(
        eq(
          promotions.id,
          (context as FreshContext<AuthenticatedState>).params.idPromo,
        ),
      )
      .then((rows) => rows[0] ?? null);

    if (!promo) return NOT_FOUND;

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

  // #16 PUT /promotions/{idPromo}
  PUT: withRules(["student_write"])(async (request, context) => {
    const body: { annee: string } = await request.json();

    const [updated] = await db
      .update(promotions)
      .set({ annee: body.annee })
      .where(
        eq(
          promotions.id,
          (context as FreshContext<AuthenticatedState>).params.idPromo,
        ),
      )
      .returning();

    if (!updated) return NOT_FOUND;

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

  // #17 DELETE /promotions/{idPromo}
  DELETE: withRules(["student_write"])(async (_request, context) => {
    const [deleted] = await db
      .delete(promotions)
      .where(
        eq(
          promotions.id,
          (context as FreshContext<AuthenticatedState>).params.idPromo,
        ),
      )
      .returning();

    if (!deleted) return NOT_FOUND;

    return new Response(null, { status: 204 });
  }),
};