import { test } from "node:test";
import assert from "node:assert/strict";
import { createRest, RestOutcome, USER_AGENT } from "../src/rest.mjs";

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

const TOKEN = "T0KEN-not-real-1234567890";

test("rest: createMessage sends nonce, enforce_nonce, empty allowed_mentions and a soft reply reference", async () => {
  const f = fakeFetch([{ status: 200, body: { id: "m1" } }]);
  const rest = createRest({ token: TOKEN, fetch: f.fetch });
  const r = await rest.createMessage("c1", { content: "hi", nonce: "n1", replyTo: "orig" });
  assert.deepEqual(r, { messageId: "m1", status: 200 });
  const call = f.calls[0];
  assert.equal(call.url, "https://discord.com/api/v10/channels/c1/messages");
  assert.equal(call.init.method, "POST");
  assert.equal(call.init.headers.Authorization, `Bot ${TOKEN}`);
  assert.equal(call.init.headers["User-Agent"], USER_AGENT);
  assert.deepEqual(JSON.parse(call.init.body), {
    content: "hi", nonce: "n1", enforce_nonce: true,
    allowed_mentions: { parse: [], replied_user: false },
    message_reference: { message_id: "orig", fail_if_not_exists: false },
  });
});

test("rest: 429 waits retry_after and retries; 4xx is refused; 5xx and socket errors are unknown", async () => {
  const waits = [];
  const sleep = async (ms) => waits.push(ms);
  let f = fakeFetch([{ status: 429, body: { retry_after: 0.25 } }, { status: 200, body: { id: "m2" } }]);
  let rest = createRest({ token: TOKEN, fetch: f.fetch, sleep });
  const r = await rest.createMessage("c1", { content: "hi", nonce: "n2" });
  assert.equal(r.messageId, "m2");
  assert.deepEqual(waits, [250]);
  assert.equal(f.calls.length, 2);

  f = fakeFetch([{ status: 403, body: { code: 50001, message: "Missing Access" } }]);
  rest = createRest({ token: TOKEN, fetch: f.fetch, sleep });
  await assert.rejects(rest.createMessage("c1", { content: "hi", nonce: "n3" }), (err) => err instanceof RestOutcome && err.kind === "refused" && err.details.status === 403);

  f = fakeFetch([{ status: 502, body: { message: "bad gateway" } }]);
  rest = createRest({ token: TOKEN, fetch: f.fetch, sleep });
  await assert.rejects(rest.createMessage("c1", { content: "hi", nonce: "n4" }), (err) => err instanceof RestOutcome && err.kind === "unknown");

  f = fakeFetch([{ throw: "socket hang up" }]);
  rest = createRest({ token: TOKEN, fetch: f.fetch, sleep });
  await assert.rejects(rest.createMessage("c1", { content: "hi", nonce: "n5" }), (err) => err instanceof RestOutcome && err.kind === "unknown" && !err.message.includes(TOKEN));

  // Bounded 429 retries: four 429s in a row end refused.
  f = fakeFetch([429, 429, 429, 429].map(() => ({ status: 429, body: { retry_after: 0.01 } })));
  rest = createRest({ token: TOKEN, fetch: f.fetch, sleep });
  await assert.rejects(rest.createMessage("c1", { content: "hi", nonce: "n6" }), (err) => err.kind === "refused" && err.details.status === 429);
  assert.equal(f.calls.length, 4);
});

test("rest: content and nonce limits are enforced locally; typing never throws", async () => {
  const f = fakeFetch([{ status: 500 }, { throw: "down" }]);
  const rest = createRest({ token: TOKEN, fetch: f.fetch });
  await assert.rejects(rest.createMessage("c", { content: "x".repeat(2001), nonce: "n" }), /1..2000/);
  await assert.rejects(rest.createMessage("c", { content: "x", nonce: "n".repeat(26) }), /1..25/);
  await rest.typing("c");
  await rest.typing("c");
  assert.equal(f.calls.length, 2);
});

test("rest: react PUTs the encoded emoji on the inbound message for @me; 2xx is true, anything else is false and never throws", async () => {
  const f = fakeFetch([{ status: 204 }, { status: 403, body: { message: "Missing Permissions", code: 50013 } }, { throw: "down" }]);
  const logs = [];
  const rest = createRest({ token: TOKEN, fetch: f.fetch, log: (m) => logs.push(m) });
  assert.equal(await rest.react("c1", "m1", "\u{1F440}"), true);
  assert.equal(f.calls[0].url, "https://discord.com/api/v10/channels/c1/messages/m1/reactions/%F0%9F%91%80/@me");
  assert.equal(f.calls[0].init.method, "PUT");
  assert.equal(f.calls[0].init.body, undefined);
  assert.equal(f.calls[0].init.headers.Authorization, `Bot ${TOKEN}`);
  assert.equal(await rest.react("c1", "m2", "\u{1F440}"), false);
  assert.equal(await rest.react("c1", "m3", "\u{1F440}"), false);
  assert.equal(logs.length, 2);
  assert.match(logs[0], /HTTP 403/);
  assert.ok(logs.every((l) => !l.includes(TOKEN)));
  await assert.rejects(rest.react("c1", "m4", ""), /emoji required/);
});