import { describe, expect, test } from "bun:test";
import {
  calculerPeriode,
  construireUrlPage,
  recupererAgendaPublie,
} from "./extension/agenda-mairie.js";

function evenement(surcharges: Record<string, unknown> = {}) {
  return {
    uid: "uid-1",
    titre: "Atelier",
    debut: new Date("2026-07-10T16:00:00Z"),
    fin: new Date("2026-07-10T18:00:00Z"),
    journeeEntiere: false,
    ...surcharges,
  };
}

describe("calculerPeriode", () => {
  test("debut = mois d'aujourd'hui ; fin = mois du dernier début", () => {
    const evenements = [
      evenement({ debut: new Date("2026-07-20T10:00:00Z") }),
      evenement({ debut: new Date("2026-09-05T10:00:00Z") }),
      evenement({ debut: new Date("2026-08-01T10:00:00Z") }),
    ];
    const aujourdhui = new Date("2026-07-17T09:00:00Z");

    expect(calculerPeriode(evenements, aujourdhui)).toEqual({
      debut: "07/2026",
      fin: "09/2026",
    });
  });

  test("liste vide → période bornée au mois courant", () => {
    const aujourdhui = new Date("2026-07-17T09:00:00Z");
    expect(calculerPeriode([], aujourdhui)).toEqual({ debut: "07/2026", fin: "07/2026" });
  });
});

describe("construireUrlPage", () => {
  const periode = { debut: "07/2026", fin: "09/2026" };

  test("page 1 → URL de base sans segment /page/", () => {
    const url = construireUrlPage(1, periode);
    expect(url).toBe(
      "https://www.ville-cugnaux.fr/mes-loisirs/agenda/?f=1&theme=&date=periode&date_debut=07%2F2026&date_fin=09%2F2026&public=",
    );
  });

  test("page 3 → segment /page/3/", () => {
    const url = construireUrlPage(3, periode);
    expect(url).toContain("/mes-loisirs/agenda/page/3/?f=1");
    expect(url).toContain("date_debut=07%2F2026");
    expect(url).toContain("date_fin=09%2F2026");
  });
});

describe("recupererAgendaPublie", () => {
  const periode = { debut: "07/2026", fin: "09/2026" };
  const reponseOk = (html: string) => Promise.resolve({ ok: true, text: () => Promise.resolve(html) });

  test("3 pages non vides puis une vide → cartes agrégées, arrêt sur la vide", async () => {
    const pages = [
      [{ date: "2026-07-01", titre: "A", lien: "l1" }],
      [{ date: "2026-07-02", titre: "B", lien: "l2" }],
      [{ date: "2026-07-03", titre: "C", lien: "l3" }],
      [],
    ];
    const fetchImpl = (url: string) => reponseOk(url);
    let appel = 0;
    const extraire = () => pages[appel++];

    const res = await recupererAgendaPublie(fetchImpl, extraire, periode);

    expect(res).toEqual({
      ok: true,
      cartes: [
        { date: "2026-07-01", titre: "A", lien: "l1" },
        { date: "2026-07-02", titre: "B", lien: "l2" },
        { date: "2026-07-03", titre: "C", lien: "l3" },
      ],
    });
    expect(appel).toBe(4); // 3 pages pleines + la vide qui stoppe
  });

  test("plafond de sécurité respecté (extracteur toujours non vide)", async () => {
    let appels = 0;
    const fetchImpl = (url: string) => {
      appels++;
      return reponseOk(url);
    };
    const extraire = () => [{ date: "2026-07-01", titre: "A", lien: "l" }];

    const res = await recupererAgendaPublie(fetchImpl, extraire, periode);

    expect(res.ok).toBe(true);
    expect(appels).toBe(12); // plafond
  });

  test("fetch qui throw → { ok:false } (jamais d'exception)", async () => {
    const fetchImpl = () => Promise.reject(new Error("réseau"));
    const extraire = () => [];

    const res = await recupererAgendaPublie(fetchImpl, extraire, periode);

    expect(res).toEqual({ ok: false });
  });

  test("réponse HTTP non-ok (500) → { ok:false }", async () => {
    const fetchImpl = () => Promise.resolve({ ok: false, text: () => Promise.resolve("") });
    const extraire = () => [{ date: "2026-07-01", titre: "A", lien: "l" }];

    const res = await recupererAgendaPublie(fetchImpl, extraire, periode);

    expect(res).toEqual({ ok: false });
  });
});