import { describe, expect, test } from "bun:test";
import { ecrireStatut } from "./extension/caldav.js";
import { URL_COLLECTION } from "./extension/nextcloud.js";

const UID = "db2d146b-8e18-4df6-929f-a651d04245df";
const HREF =
  "/remote.php/dav/calendars/Pierre/latelier-du-huit-sbastien_shared_by_admin/00D03211-DA2E-4D06-AAAE-6E8C2355BA2B.ics";
const URL_RESSOURCE = "https://atelier-huit.frama.space" + HREF;
const ETAG = '"8ee26a8f6124c1833c48f319868ce10a"';

const ICS = [
  "BEGIN:VCALENDAR",
  "VERSION:2.0",
  "PRODID:-//IDN nextcloud.com//Calendar app 5.2.2//EN",
  "BEGIN:VEVENT",
  `UID:${UID}`,
  "DTSTAMP:20250828T095756Z",
  "DTSTART;TZID=Europe/Paris:20260907T090000",
  "SUMMARY:Forum des associations",
  "CATEGORIES:Concert",
  "END:VEVENT",
  "END:VCALENDAR",
  "",
].join("\r\n");

const ajouterTag = (categories: string[]) => [...categories, "mairie:ignoré"];

type Appel = { url: string; options: any };

// Faux transport : enregistre chaque appel, répond selon la méthode.
function transport({
  jeton = { status: 200, corps: '{"token":"jeton-csrf"}' },
  report = { status: 207, corps: "<multistatus/>" },
  put = { status: 204, corps: "" },
  levee = null as null | string,
}) {
  const appels: Appel[] = [];
  const fetchImpl = async (url: string, options: any = {}) => {
    appels.push({ url, options });
    const methode = options.method ?? "GET";
    if (levee === methode) throw new TypeError("Failed to fetch");
    const reponse = methode === "REPORT" ? report : methode === "PUT" ? put : jeton;
    return new Response(reponse.corps, { status: reponse.status });
  };
  return {
    appels,
    fetchImpl,
    parMethode: (methode: string) =>
      appels.filter((a) => (a.options.method ?? "GET") === methode),
  };
}

const uneReponse = () => [{ href: HREF, etag: ETAG, ics: ICS }];

function ecrire(transportUtilise: ReturnType<typeof transport>, options: any = {}) {
  return ecrireStatut({
    fetchImpl: transportUtilise.fetchImpl,
    extraireReponsesImpl: options.extraireReponsesImpl ?? uneReponse,
    uid: options.uid ?? UID,
    transformer: options.transformer ?? ajouterTag,
  });
}

describe("requête REPORT", () => {
  test("méthode, Depth, Content-Type, credentials et UID dans le corps", async () => {
    const t = transport({});
    await ecrire(t);

    const [report] = t.parMethode("REPORT");
    expect(report.url).toBe(URL_COLLECTION);
    expect(report.options.headers.Depth).toBe("1");
    expect(report.options.headers["Content-Type"]).toBe("application/xml; charset=utf-8");
    expect(report.options.credentials).toBe("include");
    expect(report.options.body).toContain(UID);
  });

  test("UID échappé en XML (jamais interpolé brut)", async () => {
    const t = transport({});
    await ecrire(t, { uid: "a&b<c>d" });

    const [report] = t.parMethode("REPORT");
    expect(report.options.body).toContain("a&amp;b&lt;c&gt;d");
    expect(report.options.body).not.toContain("a&b<c>d");
  });
});

describe("jeton CSRF", () => {
  test("jeton obtenu → en-tête requesttoken sur REPORT et PUT", async () => {
    const t = transport({});
    await ecrire(t);

    expect(t.parMethode("REPORT")[0].options.headers.requesttoken).toBe("jeton-csrf");
    expect(t.parMethode("PUT")[0].options.headers.requesttoken).toBe("jeton-csrf");
  });

  test("/csrftoken en 404 → on poursuit sans en-tête", async () => {
    const t = transport({ jeton: { status: 404, corps: "" } });
    const res = await ecrire(t);

    expect(res.ok).toBe(true);
    expect(t.parMethode("PUT")[0].options.headers.requesttoken).toBeUndefined();
  });

  test("/csrftoken qui lève → pas d'exception, écriture tentée quand même", async () => {
    const t = transport({ levee: "GET" });
    const res = await ecrire(t);

    expect(res.ok).toBe(true);
    expect(t.parMethode("PUT")).toHaveLength(1);
  });
});

describe("choix de la ressource", () => {
  test("multistatus vide → introuvable, aucun PUT", async () => {
    const t = transport({});
    const res = await ecrire(t, { extraireReponsesImpl: () => [] });

    expect(res).toEqual({ ok: false, erreur: "introuvable" });
    expect(t.parMethode("PUT")).toHaveLength(0);
  });

  test("href pointant hors de la collection → ambigu, aucun PUT", async () => {
    const t = transport({});
    const res = await ecrire(t, {
      extraireReponsesImpl: () => [
        { href: "https://ailleurs.example/vol.ics", etag: ETAG, ics: ICS },
      ],
    });

    expect(res).toEqual({ ok: false, erreur: "ambigu" });
    expect(t.parMethode("PUT")).toHaveLength(0);
  });

  test("deux href distincts → ambigu, aucun PUT", async () => {
    const t = transport({});
    const res = await ecrire(t, {
      extraireReponsesImpl: () => [
        { href: HREF, etag: ETAG, ics: ICS },
        { href: HREF + "-bis", etag: ETAG, ics: ICS },
      ],
    });

    expect(res).toEqual({ ok: false, erreur: "ambigu" });
    expect(t.parMethode("PUT")).toHaveLength(0);
  });
});

describe("requête PUT", () => {
  test("href résolu en absolu, If-Match verbatim, corps = ICS modifié", async () => {
    const t = transport({});
    const res = await ecrire(t);

    const [put] = t.parMethode("PUT");
    expect(put.url).toBe(URL_RESSOURCE);
    expect(put.options.headers["If-Match"]).toBe(ETAG);
    expect(put.options.headers["Content-Type"]).toBe("text/calendar; charset=utf-8");
    expect(put.options.credentials).toBe("include");
    expect(put.options.body).toContain("mairie:ignoré");
    expect(put.options.body).toContain("Concert");
    expect(res).toEqual({ ok: true, categories: ["Concert", "mairie:ignoré"] });
  });

  test("les catégories transformées sont celles LUES dans la ressource", async () => {
    const t = transport({});
    let vues: string[] = [];
    await ecrire(t, {
      transformer: (categories: string[]) => {
        vues = categories;
        return categories;
      },
    });

    expect(vues).toEqual(["Concert"]);
  });
});

describe("garde-fou de réécriture", () => {
  test("ICS illisible → erreur remontée, aucun PUT", async () => {
    const t = transport({});
    const res = await ecrire(t, {
      extraireReponsesImpl: () => [{ href: HREF, etag: ETAG, ics: "n'importe quoi" }],
    });

    expect(res).toEqual({ ok: false, erreur: "ics-illisible" });
    expect(t.parMethode("PUT")).toHaveLength(0);
  });

  test("calendar-data réduit à des blancs → ics-illisible, aucun PUT", async () => {
    const t = transport({});
    const res = await ecrire(t, {
      extraireReponsesImpl: () => [{ href: HREF, etag: ETAG, ics: "  \r\n  " }],
    });

    expect(res).toEqual({ ok: false, erreur: "ics-illisible" });
    expect(t.parMethode("PUT")).toHaveLength(0);
  });

  test("href absolu malformé → ambigu, aucun PUT (new URL lève)", async () => {
    const t = transport({});
    const res = await ecrire(t, {
      extraireReponsesImpl: () => [{ href: "http://[", etag: ETAG, ics: ICS }],
    });

    expect(res).toEqual({ ok: false, erreur: "ambigu" });
    expect(t.parMethode("PUT")).toHaveLength(0);
  });

  test("UID absent de la ressource → vevent-introuvable, aucun PUT", async () => {
    const t = transport({});
    const res = await ecrire(t, { uid: "uid-absent" });

    expect(res).toEqual({ ok: false, erreur: "vevent-introuvable" });
    expect(t.parMethode("PUT")).toHaveLength(0);
  });
});

describe("mapping des statuts", () => {
  const cas: [number, string][] = [
    [412, "conflit"],
    [403, "lecture-seule"],
    [404, "introuvable"],
    [500, "serveur"],
  ];

  for (const [status, erreur] of cas) {
    test(`PUT ${status} → ${erreur}`, async () => {
      const t = transport({ put: { status, corps: "" } });
      expect(await ecrire(t)).toEqual({ ok: false, erreur });
    });

    test(`REPORT ${status} → ${erreur}, aucun PUT`, async () => {
      const t = transport({ report: { status, corps: "" } });
      expect(await ecrire(t)).toEqual({ ok: false, erreur });
      expect(t.parMethode("PUT")).toHaveLength(0);
    });
  }

  test("PUT 201 → succès", async () => {
    const t = transport({ put: { status: 201, corps: "" } });
    expect((await ecrire(t)).ok).toBe(true);
  });

  test("401 avec corps mentionnant CSRF → csrf", async () => {
    const t = transport({
      put: { status: 401, corps: '{"message":"CSRF check not passed."}' },
    });
    expect(await ecrire(t)).toEqual({ ok: false, erreur: "csrf" });
  });

  test("401 sans mention CSRF → non-connecte", async () => {
    const t = transport({ put: { status: 401, corps: "Unauthorized" } });
    expect(await ecrire(t)).toEqual({ ok: false, erreur: "non-connecte" });
  });

  test("REPORT qui lève → reseau, aucun PUT", async () => {
    const t = transport({ levee: "REPORT" });
    expect(await ecrire(t)).toEqual({ ok: false, erreur: "reseau" });
    expect(t.parMethode("PUT")).toHaveLength(0);
  });

  test("PUT qui lève → reseau", async () => {
    const t = transport({ levee: "PUT" });
    expect(await ecrire(t)).toEqual({ ok: false, erreur: "reseau" });
  });

  // La connexion peut tomber APRÈS les en-têtes : c'est `text()` qui rejette,
  // pas `fetch`. Sans cela, l'exception remonterait jusqu'au clic.
  test("corps illisible (text() qui rejette) → reseau, jamais d'exception", async () => {
    const appels: string[] = [];
    const fetchImpl = async (_url: string, options: any = {}) => {
      const methode = options.method ?? "GET";
      appels.push(methode);
      if (methode === "GET") return new Response('{"token":"t"}');
      return {
        ok: true,
        status: 207,
        text: () => Promise.reject(new TypeError("Network error while reading body")),
      };
    };

    const res = await ecrireStatut({
      fetchImpl,
      extraireReponsesImpl: uneReponse,
      uid: UID,
      transformer: ajouterTag,
    });

    expect(res).toEqual({ ok: false, erreur: "reseau" });
    expect(appels).not.toContain("PUT");
  });
});