import { test } from "node:test";
import assert from "node:assert/strict";
import { openDirect } from "../src/notify.mjs";
import { RestOutcome } from "../src/rest.mjs";
import { DiscordError } from "../src/errors.mjs";
import { makeRoot, makeDeployment, IDS } from "./helpers.mjs";

const CHANNEL = "100000000000000900";
const TOKEN = "MTAw.abcdefghijklmnopqrstuvwxyz0123456789";

function fakeFetch(script) {
  const calls = [];
  const fetch = async (url, init) => {
    calls.push({ url, method: init.method, body: init.body ? JSON.parse(init.body) : null, auth: init.headers.Authorization });
    const next = script.shift();
    if (!next) throw new Error("fake fetch: no scripted response");
    return { status: next.status, text: async () => (next.body === undefined ? "" : JSON.stringify(next.body)) };
  };
  return { fetch, calls };
}

const secretFree = (err) => ![IDS.owner, CHANNEL, TOKEN].some((s) => err.message.includes(s) || JSON.stringify(err.details ?? {}).includes(s));

test("notify: the DM channel opens once, every send carries the nonce, and only the message id comes back", async () => {
  const { dataRoot } = makeDeployment(makeRoot(), { dmRecipient: IDS.owner });
  const f = fakeFetch([
    { status: 200, body: { id: CHANNEL, type: 1 } },
    { status: 200, body: { id: "300000000000000001" } },
    { status: 200, body: { id: "300000000000000002" } },
  ]);
  const dm = openDirect({ dataRoot, name: "test-seat", fetch: f.fetch, base: "http://fake" });
  assert.deepEqual(await dm.send({ content: "one", nonce: "dm1" }), { messageId: "300000000000000001" });
  assert.deepEqual(await dm.send({ content: "two", nonce: "dm2" }), { messageId: "300000000000000002" });
  assert.deepEqual(f.calls.map((c) => `${c.method} ${c.url}`), [
    "POST http://fake/users/@me/channels",
    `POST http://fake/channels/${CHANNEL}/messages`,
    `POST http://fake/channels/${CHANNEL}/messages`,
  ]);
  assert.deepEqual(f.calls[0].body, { recipient_id: IDS.owner });
  assert.equal(f.calls[1].body.nonce, "dm1");
  assert.equal(f.calls[1].body.enforce_nonce, true);
  assert.deepEqual(f.calls[1].body.allowed_mentions, { parse: [], replied_user: false });
  assert.ok(f.calls.every((c) => c.auth === `Bot ${TOKEN}`));
  assert.equal(JSON.stringify(dm).includes(TOKEN) || JSON.stringify(dm).includes(IDS.owner), false);
});

test("notify: refusals and unknowns surface as RestOutcome without ids; a refused send reopens the channel next time", async () => {
  const { dataRoot } = makeDeployment(makeRoot(), { dmRecipient: IDS.owner });
  const f = fakeFetch([
    { status: 403, body: { code: 50007, message: `Cannot send messages to ${IDS.owner}` } },
    { status: 200, body: { id: CHANNEL } },
    { status: 502, body: { message: `channel ${CHANNEL} upstream` } },
    { status: 200, body: { id: "300000000000000003" } },
    { status: 403, body: { code: 50007, message: "Cannot send messages to this user" } },
    { status: 200, body: { id: CHANNEL } },
    { status: 200, body: { id: "300000000000000004" } },
  ]);
  const dm = openDirect({ dataRoot, name: "test-seat", fetch: f.fetch, base: "http://fake" });
  await assert.rejects(dm.send({ content: "x", nonce: "n1" }), (e) => e instanceof RestOutcome && e.kind === "refused" && e.details.status === 403 && secretFree(e));
  await assert.rejects(dm.send({ content: "x", nonce: "n1" }), (e) => e instanceof RestOutcome && e.kind === "unknown" && secretFree(e));
  // unknown keeps the channel; the retry reuses it with the same nonce.
  assert.deepEqual(await dm.send({ content: "x", nonce: "n1" }), { messageId: "300000000000000003" });
  await assert.rejects(dm.send({ content: "y", nonce: "n2" }), (e) => e.kind === "refused" && secretFree(e));
  assert.deepEqual(await dm.send({ content: "y", nonce: "n2" }), { messageId: "300000000000000004" });
  assert.equal(f.calls.filter((c) => c.url.endsWith("/users/@me/channels")).length, 3);
});

test("notify: no dmRecipient, a non-0600 binding or token, or a missing binding refuse before any network use", async () => {
  let calls = 0;
  const fetch = async () => {
    calls++;
    throw new Error("network");
  };
  const none = makeDeployment(makeRoot());
  assert.throws(() => openDirect({ dataRoot: none.dataRoot, name: "test-seat", fetch }), (e) => e instanceof DiscordError && e.exitCode === 2 && /no dmRecipient/.test(e.message));
  const loose = makeDeployment(makeRoot(), { dmRecipient: IDS.owner }, { tokenMode: 0o644 });
  assert.throws(() => openDirect({ dataRoot: loose.dataRoot, name: "test-seat", fetch }), (e) => e instanceof DiscordError && /mode 0600/.test(e.message) && !e.message.includes(TOKEN));
  assert.throws(() => openDirect({ dataRoot: none.dataRoot, name: "absent", fetch }), (e) => e instanceof DiscordError && /binding not found/.test(e.message));
  assert.equal(calls, 0);
});