import assert from "node:assert/strict";
import test from "node:test";
import { parse } from "lossless-json";
import {
  decodeResponse,
  decodeNotification,
  decodeValue,
  formatSnapshot,
  ProtocolError,
  Command,
} from "../src/protocol";
import { actor, json, REF } from "./fixtures";

const command: Command = { operation: "list_actors" };
const envelope = (reply: unknown) =>
  json({ version: 3, request_id: "test", result: { Ok: reply } });

test("notification envelopes preserve u64 revisions and reject malformed events", () => {
  const notification = (data: unknown) =>
    json({
      version: 3,
      event: {
        event: "image_changed",
        data,
      },
    });
  assert.equal(
    decodeNotification(notification({ revision: 18446744073709551615n })),
    18446744073709551615n,
  );
  assert.equal(decodeNotification(envelope({ kind: "actors", data: [] })), undefined);
  for (const data of [
    { revision: 0 },
    { revision: -1 },
    { revision: 1.5 },
    { revision: 18446744073709551616n },
    { revision: "1" },
    { revision: 1, extra: true },
    {},
  ]) {
    assert.throws(() => decodeNotification(notification(data)));
  }
  assert.throws(() =>
    decodeNotification(
      json({
        version: 2,
        event: { event: "image_changed", data: { revision: 1 } },
      }),
    ),
  );
});

test("v3 snapshots preserve all value variants, i64 limits, u64 telemetry, and mailbox order", () => {
  const snapshot = actor();
  const reply = decodeResponse(envelope({ kind: "actors", data: [snapshot] }), "test", command);
  assert.deepEqual(reply, { kind: "actors", data: [snapshot] });
  const formatted = formatSnapshot(snapshot, "[::1]:3737", "2026-11-03T00:00:00Z", false);
  assert.match(formatted, /9223372036854775807/);
  assert.match(formatted, /-9223372036854775808/);
  assert.match(formatted, /18446744073709551615/);
  assert.deepEqual(parse(formatted, undefined, BigInt), {
    connection: { endpoint: "[::1]:3737", connected: false },
    captured_at: "2026-11-03T00:00:00Z",
    actor: snapshot,
  });
});

test("version, correlation, result, reply kind, and actor identity are checked", () => {
  for (const change of [
    { version: 2 },
    { request_id: "wrong" },
    { result: { Ok: { kind: "actor", data: actor() } } },
    { result: { Ok: {}, Err: {} } },
    { result: {} },
  ]) {
    assert.throws(() =>
      decodeResponse(
        json({
          version: 3,
          request_id: "test",
          result: { Ok: { kind: "actors", data: [] } },
          ...change,
        }),
        "test",
        command,
      ),
    );
  }
  assert.throws(() =>
    decodeResponse(envelope({ kind: "actors", data: [actor(), actor()] }), "test", command),
  );
  assert.throws(() =>
    decodeResponse(envelope({ kind: "actor", data: actor() }), "test", {
      operation: "inspect_actor",
      parameters: { actor_ref: "ABCDEFGHIJKLMNOPQRSTU" },
    }),
  );
});

test("server errors are explicit, typed, and not treated as empty actor lists", () => {
  assert.throws(
    () =>
      decodeResponse(
        json({
          version: 3,
          request_id: "test",
          result: { Err: { code: "not_found", message: "No actor" } },
        }),
        "test",
        command,
      ),
    (error) => error instanceof ProtocolError && error.code === "not_found",
  );
});

test("mutation replies must match the requested operation and carry validated data", () => {
  const spawn: Command = {
    operation: "spawn",
    parameters: {
      behavior_name: "counter",
      state: { type: "integer", data: 0n },
      mailbox_capacity: 64,
    },
  };
  assert.deepEqual(
    decodeResponse(envelope({ kind: "actor_spawned", data: { actor_ref: REF } }), "test", spawn),
    { kind: "actor_spawned", data: { actor_ref: REF } },
  );
  assert.throws(() =>
    decodeResponse(envelope({ kind: "actor_spawned", data: { actor_ref: "bad" } }), "test", spawn),
  );
  assert.throws(() => decodeResponse(envelope({ kind: "acknowledged" }), "test", spawn));
  const tick: Command = { operation: "tick", parameters: { ticks: 10, instruction_budget: 32 } };
  assert.deepEqual(
    decodeResponse(envelope({ kind: "tick_completed", data: { ticks: 10 } }), "test", tick),
    { kind: "tick_completed", data: { ticks: 10n } },
  );
  assert.throws(() =>
    decodeResponse(envelope({ kind: "tick_completed", data: { ticks: 11 } }), "test", tick),
  );
  for (const operation of [
    "stop_actor",
    "restart_actor",
    "pause_actor",
    "resume_actor",
    "send",
  ] as const) {
    const command: Command =
      operation === "send"
        ? { operation, parameters: { actor_ref: REF, message: { type: "null" } } }
        : { operation, parameters: { actor_ref: REF } };
    assert.deepEqual(decodeResponse(envelope({ kind: "acknowledged" }), "test", command), {
      kind: "acknowledged",
    });
    assert.throws(() => decodeResponse(envelope({ kind: "actors", data: [] }), "test", command));
  }
});

test("behavior listings validate names, revisions, history, and uniqueness", () => {
  const behavior = {
    name: "counter",
    revision: 1n,
    current_implementation_id: "id",
    history: [{ revision: 1n, implementation_id: "id" }],
  };
  assert.deepEqual(
    decodeResponse(envelope({ kind: "behaviors", data: [behavior] }), "test", {
      operation: "get_behaviors",
    }),
    { kind: "behaviors", data: [behavior] },
  );
  for (const data of [
    [{ ...behavior, name: "" }],
    [{ ...behavior, revision: 0 }],
    [{ ...behavior, history: [{ revision: 0, implementation_id: "id" }] }],
    [behavior, behavior],
  ])
    assert.throws(() =>
      decodeResponse(envelope({ kind: "behaviors", data }), "test", { operation: "get_behaviors" }),
    );
});

test("malformed states and snapshots fail instead of being coerced", () => {
  for (const state of [
    { type: "integer", data: 9223372036854775808n },
    { type: "integer", data: -9223372036854775809n },
    { type: "integer", data: 1.5 },
    { type: "actor_ref", data: "guessable" },
    { type: "string", data: REF, extra: true },
    { type: "null", data: null },
    { type: "float", data: 1 },
  ]) {
    assert.throws(() =>
      decodeResponse(envelope({ kind: "actors", data: [{ ...actor(), state }] }), "test", command),
    );
  }
  for (const change of [
    { status: { status: "unknown" } },
    { status: { status: "failed" } },
    { incarnation: -1 },
    { mailbox_id: 18446744073709551616n },
    { execution: { vm_steps: "20" } },
    { reserved: undefined },
    { queued: null },
    { actor_ref: "@invalid" },
  ]) {
    assert.throws(() =>
      decodeResponse(
        envelope({ kind: "actors", data: [{ ...actor(), ...change }] }),
        "test",
        command,
      ),
    );
  }
});

test("portable value limits have inclusive depth, node, and UTF-8 byte boundaries", () => {
  let nested: unknown = { type: "null" };
  for (let i = 0; i < 32; i++) nested = { type: "list", data: [nested] };
  assert.doesNotThrow(() => decodeValue(nested));
  assert.throws(() => decodeValue({ type: "list", data: [nested] }), /depth/);
  const data = Array.from({ length: 4095 }, () => ({ type: "null" }));
  assert.doesNotThrow(() => decodeValue({ type: "list", data }));
  assert.throws(() => decodeValue({ type: "list", data: [...data, { type: "null" }] }), /node/);
  assert.doesNotThrow(() => decodeValue({ type: "string", data: "é".repeat(524288) }));
  assert.throws(() => decodeValue({ type: "string", data: "é".repeat(524288) + "a" }), /byte/);
});